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CN111009917B - A kind of inverter distributed control method and system - Google Patents

A kind of inverter distributed control method and system Download PDF

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CN111009917B
CN111009917B CN201911255752.1A CN201911255752A CN111009917B CN 111009917 B CN111009917 B CN 111009917B CN 201911255752 A CN201911255752 A CN 201911255752A CN 111009917 B CN111009917 B CN 111009917B
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value
power generation
virtual impedance
generation node
inverter
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CN111009917A (en
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魏澈
项基
胡亚龙
刘国锋
韦巍
邱银锋
彭勇刚
李强
张丽娜
李雪
高璇
胡意茹
王双成
王凯藤
车久玮
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Zhejiang University ZJU
China National Offshore Oil Corp CNOOC
CNOOC Research Institute Co Ltd
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Zhejiang University ZJU
China National Offshore Oil Corp CNOOC
CNOOC Research Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

本发明涉及一种逆变器分布式控制方法和系统，包括以下步骤：通过无功功率输出值生成第一虚拟阻抗修正值；通过虚拟阻抗平均值生成第二虚拟阻抗修正值；通过输出电压幅值平均值生成第一电压修正值；通过输出电压幅值参考值生成第二电压修正值；通过所述第一虚拟阻抗修正值、第二虚拟阻抗修正值计算出修正后的虚拟阻抗值；通过第一电压修正值、第二电压修正值计算出修正后的输出电压幅值参考值；将二者作为逆变器的控制输入，实现所述逆变器对于无功功率的输出与电压值的恢复，避免了虚拟阻抗运行中的偏移，使得系统的虚拟阻抗只受负载分布的影响，保持了虚拟阻抗的稳定运行。

Figure 201911255752

The invention relates to an inverter distributed control method and system, comprising the following steps: generating a first virtual impedance correction value according to a reactive power output value; generating a second virtual impedance correction value according to the average value of the virtual impedance; The average value of the values generates a first voltage correction value; the output voltage amplitude reference value is used to generate a second voltage correction value; the corrected virtual impedance value is calculated through the first virtual impedance correction value and the second virtual impedance correction value; The first voltage correction value and the second voltage correction value calculate the corrected output voltage amplitude reference value; use the two as the control input of the inverter to realize the output of the reactive power and the voltage value of the inverter. The recovery avoids the offset in the virtual impedance operation, so that the virtual impedance of the system is only affected by the load distribution, and the stable operation of the virtual impedance is maintained.

Figure 201911255752

Description

一种逆变器分布式控制方法和系统A kind of inverter distributed control method and system

技术领域technical field

本发明是关于一种逆变器分布式控制方法和系统，属于逆变器控制技术领域。The invention relates to an inverter distributed control method and system, belonging to the technical field of inverter control.

背景技术Background technique

分布式电源通过逆变器并入交流电网中，交流电网中多个分布式电源并联运行，多采用对等控制策略。所谓对等控制策略，即各分布式电源之间是“平等”的，不存在才从属关系，所有分布式电源以预先设定的控制模式参与有功无功调节，从而维持系统电压频率的稳定。实现分布式电源并联运行的关键在于各电源能共同分担负荷，以达到各逆变电源输出功率平衡，使系统达到稳定运行状态。分布式控制具有无中心和对系统通信要求低的特点。因此考虑采用分布式控制来实现无功功率的均分。Distributed power sources are integrated into the AC grid through inverters, and multiple distributed power sources in the AC power grid operate in parallel, and most of them adopt a peer-to-peer control strategy. The so-called peer-to-peer control strategy means that each distributed power source is "equal", and there is no subordination relationship. All distributed power sources participate in active and reactive power regulation in a preset control mode, thereby maintaining the stability of the system voltage and frequency. The key to realize the parallel operation of distributed power sources is that each power source can share the load, so as to achieve the output power balance of each inverter power source and make the system reach a stable operation state. Distributed control has the characteristics of no center and low requirements for system communication. Therefore, it is considered to adopt distributed control to realize the equal sharing of reactive power.

无功功率的波动会引起发电节点电压的波动，同样考虑采用分布式控制来实现发电节点电压的恢复。但在无功功率的均分与电压恢复的过程中，由于两个控制作用的耦合会引起系统的虚拟阻抗值的偏移与不可预测的波动，而虚拟阻抗的过大或过小将会引起系统的不稳定。The fluctuation of reactive power will cause the fluctuation of the voltage of the power generation node, and the distributed control is also considered to realize the recovery of the voltage of the power generation node. However, in the process of reactive power equalization and voltage recovery, the coupling of the two control functions will cause the offset and unpredictable fluctuations of the virtual impedance value of the system. of instability.

发明内容SUMMARY OF THE INVENTION

针对上述问题，本发明的目的是提供一种逆变器分布式控制方法和系统，其通过虚拟阻抗加权平均值恢复控制，可以实现发电节点虚拟阻抗加权平均值恢复至设定值，避免了虚拟阻抗运行中的偏移，使得系统的虚拟阻抗只受负载分布的影响，保持了虚拟阻抗的稳定运行。In view of the above problems, the purpose of the present invention is to provide an inverter distributed control method and system, which can restore the virtual impedance weighted average value of the power generation node to the set value by restoring the virtual impedance weighted average value to the control, avoiding the virtual impedance weighted average value. The offset in the impedance operation makes the virtual impedance of the system only affected by the load distribution and maintains the stable operation of the virtual impedance.

本发明公开了一种逆变器分布式控制方法，包括以下步骤：S1各分布式电源通过逆变器并入交流电网中，每个逆变器为一个发电节点，发电节点至少与一个相邻发电节点存在通信连接，发电节点采集逆变器的无功功率输出值，虚拟阻抗，输出电压幅值和输出电压幅值参考值；S2将待测发电节点的无功功率输出值与相邻发电节点的无功功率输出值输入无功分布式控制器，计算出二者无功功率输出值的差值，并将无功功率的差值输入比例积分控制模块中，生成第一虚拟阻抗修正值ΔL1,vi；S3将待测发电节点的虚拟阻抗平均值、相邻发电节点的虚拟阻抗平均值和虚拟阻抗额定值L*输入虚拟阻抗恢复分布式控制器，计算出发电节点虚拟阻抗平均值与虚拟阻抗额定值的差值，并将差值输入比例积分控制模块中，生成第二虚拟阻抗修正值ΔL2,vi；S4将待测发电节点的输出电压幅值平均值、相邻发电节点的输出电压幅值平均值和输出电压额定值

Figure BDA0002310199530000011
输入电压恢复分布式控制器，计算出发电节点输出电压幅值平均值与额定电压值的差值，并将差值输入比例积分控制模块中，生成第一电压修正值ΔV1；S5将待测发电节点的输出电压幅值参考值、相邻发电节点的输出电压幅值参考值输入电压分布式控制器，计算出输出电压幅值参考值的差值，并将差值输入比例积分控制模块中，生成第二电压修正值ΔV2；S6通过第一虚拟阻抗修正值ΔL1,vi、第二虚拟阻抗修正值ΔL2,vi和各个逆变器的虚拟阻抗初始值
Figure BDA0002310199530000021
计算出各个逆变器的修正后的虚拟阻抗值L′vi；S7通过第一电压修正值ΔV1、第二电压修正值ΔV2和输出电压额定值
Figure BDA0002310199530000022
计算出各个逆变器的修正后的输出电压幅值参考值V′refi；S8将修正后的虚拟阻抗值L′vi和修正后的电压幅值参考值V′refi作为逆变器的控制输入，实现逆变器对于无功功率的输出与电压值的恢复。The invention discloses a distributed control method for inverters, comprising the following steps: S1, each distributed power source is merged into an AC power grid through an inverter, each inverter is a power generation node, and the power generation node is at least one adjacent The power generation node has a communication connection, and the power generation node collects the reactive power output value of the inverter, the virtual impedance, the output voltage amplitude and the reference value of the output voltage amplitude; S2 compares the reactive power output value of the power generation node to be tested with the adjacent power generation The reactive power output value of the node is input to the reactive power distributed controller, the difference between the reactive power output values of the two is calculated, and the reactive power difference is input into the proportional-integral control module to generate the first virtual impedance correction value ΔL 1,vi ; S3 input the virtual impedance average value of the power generation node to be tested, the virtual impedance average value of the adjacent power generation node and the virtual impedance rated value L * into the virtual impedance recovery distributed controller, and calculate the virtual impedance average value of the power generation node The difference from the rated value of the virtual impedance, and input the difference into the proportional-integral control module to generate a second virtual impedance correction value ΔL 2,vi ; The output voltage amplitude average value and output voltage rating of
Figure BDA0002310199530000011
The input voltage restores the distributed controller, calculates the difference between the average value of the output voltage amplitude of the power generation node and the rated voltage value, and inputs the difference into the proportional-integral control module to generate the first voltage correction value ΔV 1 ; S5 will be tested The output voltage amplitude reference value of the power generation node and the output voltage amplitude reference value of the adjacent power generation node are input into the voltage distributed controller, the difference between the output voltage amplitude reference values is calculated, and the difference is input into the proportional integral control module. , to generate the second voltage correction value ΔV 2 ; S6 passes the first virtual impedance correction value ΔL 1,vi , the second virtual impedance correction value ΔL 2,vi and the virtual impedance initial value of each inverter
Figure BDA0002310199530000021
Calculate the corrected virtual impedance value L' vi of each inverter; S7 passes the first voltage correction value ΔV 1 , the second voltage correction value ΔV 2 and the output voltage rated value
Figure BDA0002310199530000022
Calculate the corrected output voltage amplitude reference value V'refi of each inverter; S8 uses the corrected virtual impedance value L' vi and the corrected voltage amplitude reference value V'refi as the control input of the inverter , to realize the recovery of the inverter's output of reactive power and voltage value.

进一步，步骤S2中，待测发电节点的无功功率输出值与相邻发电节点的无功功率输出值的差值

Figure BDA0002310199530000023
的计算公式为：Further, in step S2, the difference between the reactive power output value of the power generation node to be tested and the reactive power output value of the adjacent power generation node
Figure BDA0002310199530000023
The calculation formula is:

Figure BDA0002310199530000024
Figure BDA0002310199530000024

将差值

Figure BDA0002310199530000025
输入比例积分控制模块得到第一虚拟阻抗修正值ΔL1,vi，第一虚拟阻抗修正值ΔL1,vi的计算公式为：the difference
Figure BDA0002310199530000025
Input the proportional integral control module to obtain the first virtual impedance correction value ΔL 1,vi , and the calculation formula of the first virtual impedance correction value ΔL 1,vi is:

Figure BDA0002310199530000026
Figure BDA0002310199530000026

其中,

Figure BDA0002310199530000027
为待测发电节点i的相邻发电节点集合，aij为系数，如果待测发电节点i和相邻发电节点j存在连接，则aij＝1，否则aij＝0；Qi为待测发电节点的无功功率输出值；Qj为相邻发电节点的无功功率输出值，kj为相邻发电节点j的无功分担比例，ki为待测发电节点i的无功分担比例，KP-Q为第一比例控制参数，Ki-Q为第一积分控制参数；t为比例积分控制模块的控制时间，τ为积分变量。in,
Figure BDA0002310199530000027
is the set of adjacent power generation nodes of the power generation node i to be tested, a ij is the coefficient, if there is a connection between the power generation node i to be tested and the adjacent power generation node j, then a ij =1, otherwise a ij =0; Reactive power output value of the power generation node; Q j is the reactive power output value of the adjacent power generation node, k j is the reactive power sharing ratio of the adjacent power generation node j, and k i is the reactive power sharing ratio of the power generation node i to be tested. , K PQ is the first proportional control parameter, K iQ is the first integral control parameter; t is the control time of the proportional-integral control module, and τ is the integral variable.

进一步，步骤S3中，发电节点虚拟阻抗平均值与额定值的差值

Figure BDA0002310199530000028
的公式为：Further, in step S3, the difference between the average value of the virtual impedance of the power generation node and the rated value
Figure BDA0002310199530000028
The formula is:

Figure BDA0002310199530000029
Figure BDA0002310199530000029

并将差值

Figure BDA00023101995300000210
输入比例积分控制模块中，生成虚拟阻抗修正值ΔL2,vi，其计算公式为：and the difference
Figure BDA00023101995300000210
Input the proportional-integral control module to generate the virtual impedance correction value ΔL 2,vi , and its calculation formula is:

Figure BDA00023101995300000211
Figure BDA00023101995300000211

Figure BDA00023101995300000212
Figure BDA00023101995300000212

其中，

Figure BDA00023101995300000213
为待测发电节点虚拟阻抗平均值；
Figure BDA00023101995300000214
为相邻节点的虚拟阻抗平均值；L*为虚拟阻抗额定值，gLi为调整系数，
Figure BDA00023101995300000215
为第二比例控制参数，
Figure BDA00023101995300000216
为第二积分控制参数,wi为权重系数，Lvi为虚拟阻抗值。in,
Figure BDA00023101995300000213
is the average value of the virtual impedance of the power generation node to be tested;
Figure BDA00023101995300000214
is the virtual impedance average value of adjacent nodes; L * is the virtual impedance rating, g Li is the adjustment coefficient,
Figure BDA00023101995300000215
is the second proportional control parameter,
Figure BDA00023101995300000216
is the second integral control parameter, w i is the weight coefficient, and L vi is the virtual impedance value.

进一步，步骤S3中，待测节点的虚拟阻抗平均值

Figure BDA00023101995300000217
计算公式如下：Further, in step S3, the virtual impedance average value of the node to be tested
Figure BDA00023101995300000217
Calculated as follows:

Figure BDA0002310199530000031
Figure BDA0002310199530000031

其中N为系统的发电节点总数，Lvi为待测发电节点的虚拟阻抗，wi＞0。Among them, N is the total number of power generation nodes in the system, L vi is the virtual impedance of the power generation node to be tested, and w i >0.

进一步，步骤S4中，发电节点输出电压平均值与额定电压值的差值

Figure BDA0002310199530000032
的公式为：Further, in step S4, the difference between the average value of the output voltage of the power generation node and the rated voltage value
Figure BDA0002310199530000032
The formula is:

Figure BDA0002310199530000033
Figure BDA0002310199530000033

并将差值

Figure BDA0002310199530000034
输入比例积分控制模块中，生成电压修正值ΔV1，其计算公式为：and the difference
Figure BDA0002310199530000034
Input the proportional integral control module to generate the voltage correction value ΔV 1 , and its calculation formula is:

Figure BDA0002310199530000035
Figure BDA0002310199530000035

Figure BDA0002310199530000036
Figure BDA0002310199530000036

其中，

Figure BDA0002310199530000037
为待测发电节点的输出电压平均值；
Figure BDA0002310199530000038
为相邻发电节点的输出电压平均值；
Figure BDA0002310199530000039
为输出电压额定值，gVi为调整系数，
Figure BDA00023101995300000310
为第三比例控制参数，
Figure BDA00023101995300000311
为第三积分控制参数，Vi为待测发电节点输出电压。in,
Figure BDA0002310199530000037
is the average value of the output voltage of the power generation node to be tested;
Figure BDA0002310199530000038
is the average output voltage of adjacent power generation nodes;
Figure BDA0002310199530000039
is the output voltage rating, g Vi is the adjustment factor,
Figure BDA00023101995300000310
is the third proportional control parameter,
Figure BDA00023101995300000311
is the third integral control parameter, and V i is the output voltage of the power generation node to be measured.

进一步，步骤S5中，参考电压的差值

Figure BDA00023101995300000312
的公式为：Further, in step S5, the difference between the reference voltages
Figure BDA00023101995300000312
The formula is:

Figure BDA00023101995300000313
Figure BDA00023101995300000313

并将差值

Figure BDA00023101995300000314
输入比例积分控制模块中，生成电压修正值ΔV2，其计算公式为：and the difference
Figure BDA00023101995300000314
Input the proportional integral control module to generate the voltage correction value ΔV 2 , and its calculation formula is:

Figure BDA00023101995300000315
Figure BDA00023101995300000315

其中，Vrefi为待测发电节点的输出电压参考值、Vrefj为相邻发电节点的输出电压参考值，

Figure BDA00023101995300000316
为第四比例控制参数，
Figure BDA00023101995300000317
为第四积分控制参数。Among them, V refi is the output voltage reference value of the power generation node to be tested, V refj is the output voltage reference value of the adjacent power generation node,
Figure BDA00023101995300000316
is the fourth proportional control parameter,
Figure BDA00023101995300000317
is the fourth integral control parameter.

进一步，步骤S6中，修正后的虚拟阻抗值L′vi计算公式为：

Figure BDA00023101995300000318
Figure BDA00023101995300000319
其中，
Figure BDA00023101995300000320
为逆变器的虚拟阻抗初始值，ΔL1,vi为第一虚拟阻抗修正值，ΔL2,vi为第二虚拟阻抗修正值。Further, in step S6, the calculation formula of the corrected virtual impedance value L' vi is:
Figure BDA00023101995300000318
Figure BDA00023101995300000319
in,
Figure BDA00023101995300000320
is the initial value of the virtual impedance of the inverter, ΔL 1,vi is the first virtual impedance correction value, and ΔL 2,vi is the second virtual impedance correction value.

进一步，步骤S7中，修正后的输出电压幅值参考值V′refi公式为：Further, in step S7, the formula of the corrected output voltage amplitude reference value V' refi is:

Figure BDA00023101995300000321
Figure BDA00023101995300000321

其中，

Figure BDA00023101995300000322
为输出电压额定值；ΔV1为第一电压修正值，ΔV2为第二电压修正值。in,
Figure BDA00023101995300000322
is the rated value of the output voltage; ΔV 1 is the first voltage correction value, and ΔV 2 is the second voltage correction value.

进一步，步骤S8中，将修正后的虚拟阻抗值L′vi和修正后的电压幅值参考值V′refi作为逆变器的控制输入，得到的电压输出公式为：Further, in step S8, the corrected virtual impedance value L' vi and the corrected voltage amplitude reference value V'refi are used as the control input of the inverter, and the obtained voltage output formula is:

Figure BDA00023101995300000323
Figure BDA00023101995300000323

其中，ni为无功下垂系数，

Figure BDA00023101995300000324
为无功参考值，ωi为角速度值，i(t)为输出电流瞬时值。Among them, n i is the reactive power droop coefficient,
Figure BDA00023101995300000324
is the reactive power reference value, ω i is the angular velocity value, and i(t) is the instantaneous value of the output current.

本发明还包括一种逆变器分布式控制系统，包括：无功分布式控制器，用于计算出待测发电节点的无功功率输出值与相邻发电节点的无功功率输出值的差值，并将无功功率输出值的差值输入比例积分控制模块中，生成第一虚拟阻抗修正值ΔL1,vi；虚拟阻抗恢复分布式控制器，用于计算出发电节点虚拟阻抗平均值与虚拟阻抗额定值的差值，并将差值输入比例积分控制模块中，生成第二虚拟阻抗修正值ΔL2,vi；电压恢复分布式控制器，用于计算出发电节点输出电压幅值平均值与额定电压值的差值，并将差值输入比例积分控制模块中，生成第一电压修正值ΔV1；电压分布式控制器，用于计算出输出电压幅值参考值的差值，并将差值输入比例积分控制模块中，生成第二电压修正值ΔV2；虚拟阻抗修正模块，用于根据第一虚拟阻抗修正值ΔL1,vi、第二虚拟阻抗修正值ΔL2,vi和各个逆变器的虚拟阻抗初始值

Figure BDA0002310199530000041
计算出各个逆变器的修正后的虚拟阻抗值L′vi；将修正后的虚拟阻抗值L′vi作为控制输入逆变器；电压幅值参考值修正模块，用于根据第一电压修正值ΔV1、第二电压修正值ΔV2和输出电压额定值
Figure BDA0002310199530000042
计算出各个逆变器的修正后的输出电压幅值参考值V′refi；将修正后的修正后的输出电压幅值参考值V′refi作为控制输入逆变器。The invention also includes an inverter distributed control system, comprising: a reactive power distributed controller for calculating the difference between the reactive power output value of the power generation node to be tested and the reactive power output value of the adjacent power generation nodes and input the difference between the reactive power output values into the proportional-integral control module to generate the first virtual impedance correction value ΔL 1,vi ; the virtual impedance recovery distributed controller is used to calculate the average value of the virtual impedance of the power generation node and the The difference between the virtual impedance ratings, and input the difference into the proportional-integral control module to generate the second virtual impedance correction value ΔL 2,vi ; the voltage recovery distributed controller is used to calculate the average value of the output voltage amplitude of the power generation node The difference value from the rated voltage value, and input the difference value into the proportional integral control module to generate the first voltage correction value ΔV 1 ; the voltage distributed controller is used to calculate the difference value of the output voltage amplitude reference value, and use the The difference value is input into the proportional-integral control module to generate the second voltage correction value ΔV 2 ; the virtual impedance correction module is used for the first virtual impedance correction value ΔL 1,vi , the second virtual impedance correction value ΔL 2,vi and each inverse The initial value of the virtual impedance of the inverter
Figure BDA0002310199530000041
Calculate the corrected virtual impedance value L' vi of each inverter; take the corrected virtual impedance value L' vi as the control input inverter; the voltage amplitude reference value correction module is used to correct the value according to the first voltage ΔV 1 , second voltage correction value ΔV 2 and output voltage nominal value
Figure BDA0002310199530000042
Calculate the corrected output voltage amplitude reference value V'refi of each inverter; take the corrected corrected output voltage amplitude reference value V'refi as the control input inverter.

本发明由于采取以上技术方案，其具有以下优点：1、通过分布式控制每个分布式电源获取相邻节点的无功功率输出值、电压平均值、电压参考值和虚拟阻抗平均值等信息，实现分布式电源无功功率输出的均分，各个分布式电源节点电压平均值的恢复，同时实现系统中各个分布式电源的虚拟阻抗的稳定运行，只受负载分布的影响。2、通过虚拟阻抗加权平均值恢复控制，可以实现节点虚拟阻抗加权平均值恢复至设定值。3、通过参考电压一致控制，可以实现各个逆变器的参考电压幅值一致。4、通过无功分布式控制器、虚拟阻抗恢复分布式控制器、电压恢复分布式控制器、电压分布式控制器，消除了各个控制器之间的耦合对虚拟阻抗的影响，避免了虚拟阻抗运行中的偏移，使得系统的虚拟阻抗只受负载分布的影响，保持了虚拟阻抗的稳定运行。Because the present invention adopts the above technical scheme, it has the following advantages: 1. Obtain information such as reactive power output value, voltage average value, voltage reference value and virtual impedance average value of adjacent nodes through distributed control of each distributed power source, Realize the equal distribution of the reactive power output of the distributed power supply, the recovery of the average value of the voltage of each distributed power supply node, and at the same time realize the stable operation of the virtual impedance of each distributed power supply in the system, which is only affected by the load distribution. 2. Through the virtual impedance weighted average recovery control, the node virtual impedance weighted average value can be recovered to the set value. 3. Through the consistent control of the reference voltage, the reference voltage amplitude of each inverter can be consistent. 4. Through the reactive power distributed controller, virtual impedance recovery distributed controller, voltage recovery distributed controller, and voltage distributed controller, the influence of the coupling between each controller on the virtual impedance is eliminated, and the virtual impedance is avoided. The offset in operation makes the virtual impedance of the system only affected by the load distribution, and maintains the stable operation of the virtual impedance.

附图说明Description of drawings

图1为本发明一实施例中无功分布式控制器的结构示意图；1 is a schematic structural diagram of a reactive power distributed controller in an embodiment of the present invention;

图2为本发明一实施例中虚拟阻抗恢复分布式控制器的结构示意图；2 is a schematic structural diagram of a virtual impedance recovery distributed controller according to an embodiment of the present invention;

图3为本发明一实施例中电压恢复分布式控制器的结构示意图；3 is a schematic structural diagram of a voltage recovery distributed controller in an embodiment of the present invention;

图4为本发明一实施例中电压分布式控制器的示意图；4 is a schematic diagram of a voltage distributed controller in an embodiment of the present invention;

图5为本发明一实施例中虚拟阻抗修正模块和电压幅值参考值修正模块结构示意图；5 is a schematic structural diagram of a virtual impedance correction module and a voltage amplitude reference value correction module in an embodiment of the present invention;

图6为本发明一实施例中虚拟阻抗修正模块和电压幅值参考值修正模块应用原理示意图；6 is a schematic diagram of the application principle of the virtual impedance correction module and the voltage amplitude reference value correction module in an embodiment of the present invention;

图7为本发明一实施例中逆变器分布式控制方法分布式电源底层控制示意线框图。FIG. 7 is a schematic wire block diagram of the bottom layer control of a distributed power source in a distributed control method of an inverter according to an embodiment of the present invention.

具体实施方式Detailed ways

以下结合附图来对本发明进行详细的描绘。然而应当理解，附图的提供仅为了更好地理解本发明，它们不应该理解成对本发明的限制。在本发明的描述中，需要理解的是，术语仅仅是用于描述的目的，而不能理解为指示或暗示相对重要性。The present invention will be described in detail below with reference to the accompanying drawings. It should be understood, however, that the accompanying drawings are provided only for a better understanding of the present invention, and they should not be construed to limit the present invention. In describing the present invention, it is to be understood that terms are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

实施例一Example 1

本实施例中公开了一种逆变器分布式控制方法，包括以下步骤：This embodiment discloses a distributed control method for an inverter, which includes the following steps:

S1各分布式电源通过逆变器并入交流电网中，每个逆变器为一个发电节点，发电节点至少与一个相邻发电节点通信连接，发电节点采集逆变器的输出无功功率输出值，虚拟阻抗，输出电压幅值和输出电压幅值参考值。S1 The distributed power sources are merged into the AC grid through inverters. Each inverter is a power generation node. The power generation node is connected to at least one adjacent power generation node. The power generation node collects the output reactive power output value of the inverter. , virtual impedance, output voltage amplitude and output voltage amplitude reference value.

S2如图1所示，将待测发电节点的无功功率输出值与相邻发电节点的无功功率输出值输入无功分布式控制器，计算出二者无功功率输出值的差值，并将无功功率的差值输入比例积分控制模块中，生成第一虚拟阻抗修正值ΔL1,vi。S2, as shown in Figure 1, input the reactive power output value of the power generation node to be tested and the reactive power output value of the adjacent power generation node into the reactive power distributed controller, and calculate the difference between the reactive power output values of the two, And input the difference value of reactive power into the proportional integral control module to generate the first virtual impedance correction value ΔL 1,vi .

待测发电节点的无功功率输出值与相邻发电节点的无功功率输出值的差值

Figure BDA0002310199530000051
的计算公式为：The difference between the reactive power output value of the power generation node to be tested and the reactive power output value of the adjacent power generation nodes
Figure BDA0002310199530000051
The calculation formula is:

Figure BDA0002310199530000052
Figure BDA0002310199530000052

将差值

Figure BDA0002310199530000053
输入比例积分控制模块得到第一虚拟阻抗修正值ΔL1,vi，第一虚拟阻抗修正值ΔL1,vi的计算公式为：the difference
Figure BDA0002310199530000053
Input the proportional integral control module to obtain the first virtual impedance correction value ΔL 1,vi , and the calculation formula of the first virtual impedance correction value ΔL 1,vi is:

Figure BDA0002310199530000054
Figure BDA0002310199530000054

其中,

Figure BDA0002310199530000055
为待测发电节点i的相邻发电节点集合，aij为系数，如果待测发电节点i和相邻发电节点j存在连接，则aij＝1，否则aij＝0；Qi为待测发电节点的无功功率输出值；Qj为相邻发电节点的无功功率输出值，kj为相邻发电节点j的无功分担比例，ki为待测发电节点i的无功分担比例，KP-Q为第一比例控制参数，Ki-Q为第一积分控制参数；t为比例积分控制模块的控制时间，τ为积分变量。in,
Figure BDA0002310199530000055
is the set of adjacent power generation nodes of the power generation node i to be tested, a ij is the coefficient, if there is a connection between the power generation node i to be tested and the adjacent power generation node j, then a ij =1, otherwise a ij =0; Reactive power output value of the power generation node; Q j is the reactive power output value of the adjacent power generation node, k j is the reactive power sharing ratio of the adjacent power generation node j, and k i is the reactive power sharing ratio of the power generation node i to be tested. , K PQ is the first proportional control parameter, K iQ is the first integral control parameter; t is the control time of the proportional-integral control module, and τ is the integral variable.

S3如图2所示，将待测发电节点的虚拟阻抗平均值、相邻发电节点的虚拟阻抗平均值和虚拟阻抗额定值L*输入虚拟阻抗恢复分布式控制器，计算出发电节点虚拟阻抗平均值与虚拟阻抗额定值的差值，并将差值输入比例积分控制模块中，生成第二虚拟阻抗修正值ΔL2,vi。S3 As shown in Figure 2, input the virtual impedance average value of the power generation node to be tested, the virtual impedance average value of the adjacent power generation node and the virtual impedance rated value L * into the virtual impedance recovery distributed controller, and calculate the virtual impedance average value of the power generation node. The difference between the value and the nominal value of the virtual impedance is input into the proportional-integral control module to generate the second virtual impedance correction value ΔL 2,vi .

待测节点的虚拟阻抗平均值

Figure BDA0002310199530000056
计算公式如下：Average value of virtual impedance of the node under test
Figure BDA0002310199530000056
Calculated as follows:

Figure BDA0002310199530000061
Figure BDA0002310199530000061

其中N为系统的发电节点总数，Lvi为待测发电节点的虚拟阻抗，wi为权重系数，wi＞0。Among them, N is the total number of power generation nodes in the system, L vi is the virtual impedance of the power generation node to be tested, wi is the weight coefficient, and wi >0.

发电节点虚拟阻抗平均值与额定值的差值

Figure BDA0002310199530000062
的公式为：The difference between the average value of the virtual impedance of the power generation node and the rated value
Figure BDA0002310199530000062
The formula is:

Figure BDA0002310199530000063
Figure BDA0002310199530000063

并将差值

Figure BDA0002310199530000064
输入比例积分控制模块中，生成虚拟阻抗修正值ΔL2,vi，其计算公式为：and the difference
Figure BDA0002310199530000064
Input the proportional-integral control module to generate the virtual impedance correction value ΔL 2,vi , and its calculation formula is:

Figure BDA0002310199530000065
Figure BDA0002310199530000065

Figure BDA0002310199530000066
Figure BDA0002310199530000066

其中，

Figure BDA0002310199530000067
为待测发电节点虚拟阻抗平均值；
Figure BDA0002310199530000068
为相邻节点的虚拟阻抗平均值；L*为虚拟阻抗额定值，gLi为调整系数，
Figure BDA0002310199530000069
为第二比例控制参数，
Figure BDA00023101995300000610
为第二积分控制参数,，Lvi为虚拟阻抗值。in,
Figure BDA0002310199530000067
is the average value of the virtual impedance of the power generation node to be tested;
Figure BDA0002310199530000068
is the virtual impedance average value of adjacent nodes; L * is the virtual impedance rating, g Li is the adjustment coefficient,
Figure BDA0002310199530000069
is the second proportional control parameter,
Figure BDA00023101995300000610
is the second integral control parameter, L vi is the virtual impedance value.

S4如图3所示，将待测发电节点的输出电压幅值平均值、相邻发电节点的输出电压幅值平均值和输出电压额定值

Figure BDA00023101995300000611
输入电压恢复分布式控制器，计算出发电节点输出电压幅值平均值与额定电压值的差值，并将差值输入比例积分控制模块中，生成第一电压修正值ΔV1。S4, as shown in Figure 3, calculates the average value of the output voltage amplitude of the power generation node to be tested, the average value of the output voltage amplitude of the adjacent power generation nodes, and the rated output voltage.
Figure BDA00023101995300000611
The input voltage recovery distributed controller calculates the difference between the average value of the output voltage amplitude of the power generation node and the rated voltage value, and inputs the difference into the proportional-integral control module to generate the first voltage correction value ΔV 1 .

发电节点输出电压平均值与额定电压值的差值

Figure BDA00023101995300000612
的公式为：The difference between the average value of the output voltage of the power generation node and the rated voltage value
Figure BDA00023101995300000612
The formula is:

Figure BDA00023101995300000613
Figure BDA00023101995300000613

并将差值

Figure BDA00023101995300000614
输入比例积分控制模块中，生成电压修正值ΔV1，其计算公式为：and the difference
Figure BDA00023101995300000614
Input the proportional integral control module to generate the voltage correction value ΔV 1 , and its calculation formula is:

Figure BDA00023101995300000615
Figure BDA00023101995300000615

Figure BDA00023101995300000616
Figure BDA00023101995300000616

其中，

Figure BDA00023101995300000617
为待测发电节点的输出电压平均值；
Figure BDA00023101995300000618
为相邻发电节点的输出电压平均值；
Figure BDA00023101995300000619
为输出电压额定值，gVi为调整系数，
Figure BDA00023101995300000620
为第三比例控制参数，
Figure BDA00023101995300000621
为第三积分控制参数，Vi为待测发电节点输出电压。in,
Figure BDA00023101995300000617
is the average value of the output voltage of the power generation node to be tested;
Figure BDA00023101995300000618
is the average output voltage of adjacent power generation nodes;
Figure BDA00023101995300000619
is the output voltage rating, g Vi is the adjustment factor,
Figure BDA00023101995300000620
is the third proportional control parameter,
Figure BDA00023101995300000621
is the third integral control parameter, and V i is the output voltage of the power generation node to be measured.

S5如图4所示，将待测发电节点的输出电压幅值参考值、相邻发电节点的输出电压幅值参考值输入电压分布式控制器，计算出输出电压幅值参考值的差值，并将差值输入比例积分控制模块中，生成第二电压修正值ΔV2。S5, as shown in Figure 4, input the output voltage amplitude reference value of the power generation node to be tested and the output voltage amplitude reference value of the adjacent power generation node into the voltage distributed controller, and calculate the difference between the output voltage amplitude reference values, The difference value is input into the proportional-integral control module to generate the second voltage correction value ΔV 2 .

参考电压的差值

Figure BDA0002310199530000071
的公式为：Difference of reference voltage
Figure BDA0002310199530000071
The formula is:

Figure BDA0002310199530000072
Figure BDA0002310199530000072

并将差值

Figure BDA0002310199530000073
输入比例积分控制模块中，生成电压修正值ΔV2，其计算公式为：and the difference
Figure BDA0002310199530000073
Input the proportional integral control module to generate the voltage correction value ΔV 2 , and its calculation formula is:

Figure BDA0002310199530000074
Figure BDA0002310199530000074

其中，Vrefi为待测发电节点的输出电压参考值、Vrefj为相邻发电节点的输出电压参考值，

Figure BDA0002310199530000075
为第四比例控制参数，
Figure BDA0002310199530000076
为第四积分控制参数。Among them, V refi is the output voltage reference value of the power generation node to be tested, V refj is the output voltage reference value of the adjacent power generation node,
Figure BDA0002310199530000075
is the fourth proportional control parameter,
Figure BDA0002310199530000076
is the fourth integral control parameter.

S6如图5所示，通过第一虚拟阻抗修正值ΔL1,vi、第二虚拟阻抗修正值ΔL2,vi和各个逆变器的虚拟阻抗初始值

Figure BDA0002310199530000077
计算出各个逆变器的修正后的虚拟阻抗值L′vi。修正后的虚拟阻抗值L′vi计算公式为：
Figure BDA0002310199530000078
其中，
Figure BDA0002310199530000079
为逆变器的虚拟阻抗初始值，ΔL1,vi为第一虚拟阻抗修正值，ΔL2,vi为第二虚拟阻抗修正值。S6 , as shown in FIG. 5 , through the first virtual impedance correction value ΔL 1,vi , the second virtual impedance correction value ΔL 2,vi and the initial value of the virtual impedance of each inverter
Figure BDA0002310199530000077
The corrected virtual impedance value L' vi of each inverter is calculated. The calculation formula of the corrected virtual impedance value L′ vi is:
Figure BDA0002310199530000078
in,
Figure BDA0002310199530000079
is the initial value of the virtual impedance of the inverter, ΔL 1,vi is the first virtual impedance correction value, and ΔL 2,vi is the second virtual impedance correction value.

S7如图6所示，通过第一电压修正值ΔV1、第二电压修正值ΔV2和输出电压额定值

Figure BDA00023101995300000710
计算出各个逆变器的修正后的输出电压幅值参考值V′refi；修正后的输出电压幅值参考值V′refi公式为：S7 as shown in FIG. 6 , through the first voltage correction value ΔV 1 , the second voltage correction value ΔV 2 and the output voltage rated value
Figure BDA00023101995300000710
Calculate the corrected output voltage amplitude reference value V'refi of each inverter; the corrected output voltage amplitude reference value V'refi formula is:

Figure BDA00023101995300000711
Figure BDA00023101995300000711

其中，

Figure BDA00023101995300000712
为输出电压额定值；ΔV1为第一电压修正值，ΔV2为第二电压修正值。in,
Figure BDA00023101995300000712
is the rated value of the output voltage; ΔV 1 is the first voltage correction value, and ΔV 2 is the second voltage correction value.

S8如图7所示，将修正后的虚拟阻抗值L′vi和修正后的电压幅值参考值V′refi作为逆变器的控制输入，实现逆变器对于无功功率的输出与电压值的恢复。S8, as shown in Fig. 7, uses the corrected virtual impedance value L' vi and the corrected voltage amplitude reference value V'refi as the control input of the inverter, so as to realize the output of the inverter for reactive power and the voltage value recovery.

将修正后的虚拟阻抗值L′vi和修正后的电压幅值参考值V′refi作为逆变器的控制输入，得到的电压输出公式为：Taking the corrected virtual impedance value L' vi and the corrected voltage amplitude reference value V'refi as the control input of the inverter, the obtained voltage output formula is:

Figure BDA00023101995300000713
Figure BDA00023101995300000713

其中，ni为无功下垂系数，

Figure BDA00023101995300000714
为无功参考值，ωi为角速度值，i(t)为输出电流瞬时值。Among them, n i is the reactive power droop coefficient,
Figure BDA00023101995300000714
is the reactive power reference value, ω i is the angular velocity value, and i(t) is the instantaneous value of the output current.

实施例二Embodiment 2

本实施例二公开了一种逆变器分布式控制系统，包括：The second embodiment discloses an inverter distributed control system, including:

无功分布式控制器，用于计算出待测发电节点的无功功率输出值与相邻发电节点的无功功率输出值的差值，并将无功功率输出值的差值输入比例积分控制模块中，生成第一虚拟阻抗修正值ΔL1,vi；The reactive power distributed controller is used to calculate the difference between the reactive power output value of the power generation node to be tested and the reactive power output value of the adjacent power generation node, and input the difference value of the reactive power output value into the proportional integral control In the module, a first virtual impedance correction value ΔL 1,vi is generated;

虚拟阻抗恢复分布式控制器，用于计算出发电节点虚拟阻抗平均值与虚拟阻抗额定值的差值，并将差值输入比例积分控制模块中，生成第二虚拟阻抗修正值ΔL2,vi；The virtual impedance recovery distributed controller is used to calculate the difference between the virtual impedance average value of the power generation node and the virtual impedance rated value, and input the difference into the proportional-integral control module to generate the second virtual impedance correction value ΔL 2,vi ;

电压恢复分布式控制器，用于计算出发电节点输出电压幅值平均值与额定电压值的差值，并将差值输入比例积分控制模块中，生成第一电压修正值ΔV1；电压分布式控制器，用于计算出输出电压幅值参考值的差值，并将差值输入比例积分控制模块中，生成第二电压修正值ΔV2；The voltage recovery distributed controller is used to calculate the difference between the average value of the output voltage amplitude of the power generation node and the rated voltage value, and input the difference into the proportional-integral control module to generate the first voltage correction value ΔV 1 ; the voltage distribution a controller, configured to calculate the difference between the output voltage amplitude reference values, and input the difference into the proportional-integral control module to generate a second voltage correction value ΔV 2 ;

虚拟阻抗修正模块，用于根据第一虚拟阻抗修正值ΔL1,vi、第二虚拟阻抗修正值ΔL2,vi和各个逆变器的虚拟阻抗初始值

Figure BDA0002310199530000081
计算出各个逆变器的修正后的虚拟阻抗值L′vi；将修正后的虚拟阻抗值L′vi作为控制输入逆变器；The virtual impedance correction module is used for the first virtual impedance correction value ΔL 1,vi , the second virtual impedance correction value ΔL 2,vi and the virtual impedance initial value of each inverter
Figure BDA0002310199530000081
Calculate the corrected virtual impedance value L' vi of each inverter; use the corrected virtual impedance value L' vi as the control input inverter;

电压幅值参考值修正模块，用于根据第一电压修正值ΔV1、第二电压修正值ΔV2和输出电压额定值

Figure BDA0002310199530000082
计算出各个逆变器的修正后的输出电压幅值参考值V′refi；将修正后的修正后的输出电压幅值参考值V′refi作为控制输入逆变器。The voltage amplitude reference value correction module is used for according to the first voltage correction value ΔV 1 , the second voltage correction value ΔV 2 and the output voltage rated value
Figure BDA0002310199530000082
Calculate the corrected output voltage amplitude reference value V'refi of each inverter; take the corrected corrected output voltage amplitude reference value V'refi as the control input inverter.

上述各实施例仅用于说明本发明，其中各部件的结构、连接方式和制作工艺等都是可以有所变化的，凡是在本发明技术方案的基础上进行的等同变换和改进，均不应排除在本发明的保护范围之外。The above-mentioned embodiments are only used to illustrate the present invention, and the structure, connection method and manufacturing process of each component can be changed to some extent. Any equivalent transformation and improvement based on the technical solution of the present invention should not be used. Excluded from the scope of protection of the present invention.

Claims (10)

1. An inverter distributed control method is characterized by comprising the following steps:
s1, each distributed power supply is merged into an alternating current power grid through an inverter, each inverter is a power generation node, the power generation nodes are in communication connection with at least one adjacent power generation node, and the power generation nodes acquire a reactive power output value, virtual impedance, an output voltage amplitude and an output voltage amplitude reference value of the inverters;
s2, inputting the reactive power output value of the power generation node to be tested and the reactive power output value of the adjacent power generation node into the reactive power distributed controller, calculating the difference value of the reactive power output values, inputting the difference value of the reactive power into the proportional integral control module, and generating a first virtual impedance correction value delta L1,vi；
S3 is used for calculating the virtual impedance average value of the power generation node to be measured, the virtual impedance average value of the adjacent power generation node and the virtual impedance rated value L*Inputting the virtual impedance recovery distributed controller, calculating the difference between the average value of the virtual impedances of the power generation nodes and the rated value of the virtual impedances, inputting the difference into a proportional-integral control module, and generating a second virtual impedance correction value delta L2,vi；
S4 averaging the output voltage amplitude of the power generation node to be tested, averaging the output voltage amplitude of the adjacent power generation nodes and outputting the rated value of the voltage
Figure FDA0002992370690000011
The input voltage recovery distributed controller calculates the average value of the output voltage amplitude of the power generation node and the rated value of the output voltage
Figure FDA0002992370690000012
And inputting the difference into the proportional-integral control module to generate a first voltage correction value delta V1；
S5, inputting the output voltage amplitude reference value of the power generation node to be tested and the output voltage amplitude reference value of the adjacent power generation node into the voltage distributed controller, calculating the difference value of the output voltage amplitude reference values, inputting the difference value into the proportional integral control module, and generating a second voltage correction value delta V2；
S6 passing through the first virtualImpedance correction value DeltaL1,viSecond virtual impedance correction value DeltaL2,viAnd virtual impedance initial values of the respective inverters
Figure FDA0002992370690000013
Calculating the corrected virtual impedance value L 'of each inverter'vi；
S7 passing through first voltage correction value delta V1Second voltage correction value DeltaV2And output voltage rating
Figure FDA0002992370690000014
Calculating corrected output voltage amplitude reference value V 'of each inverter'refi；
S8 is the virtual impedance value L 'after correction'viAnd a corrected output voltage amplitude reference value V'efiThe control input of the inverter is used for realizing the output of the inverter to the reactive power and the recovery of the voltage value.
2. The distributed inverter control method according to claim 1, wherein in step S2, the difference between the reactive power output value of the power generation node to be tested and the reactive power output value of the adjacent power generation node
Figure FDA0002992370690000015
The calculation formula of (2) is as follows:
Figure FDA0002992370690000016
comparing the difference value
Figure FDA0002992370690000017
Inputting a proportional-integral control module to obtain the first virtual impedance correction value delta L1,viSaid first virtual impedance correction value Δ L1,viThe calculation formula of (2) is as follows:
Figure FDA0002992370690000021
wherein,
Figure FDA0002992370690000022
set of adjacent power generation nodes, a, for a power generation node i to be testedijAs a coefficient, if a power generation node i to be tested is connected with an adjacent power generation node j, aij1, otherwise aij＝0；QiThe reactive power output value is the reactive power output value of the power generation node to be detected; qjIs the reactive power output value, k, of the adjacent power generation nodejIs the reactive power sharing proportion, k, of adjacent power generation nodes jiIs the reactive power sharing proportion of the power generation node i to be tested, KP-QFor the first proportional control parameter, Ki-QA first integral control parameter; t is the control time of the proportional-integral control module, and τ is the integral variable.
3. The distributed inverter control method according to claim 2, wherein in step S3, the difference between the average value of the virtual impedances of the power generation nodes and the rated value
Figure FDA0002992370690000023
The formula of (1) is:
Figure FDA0002992370690000024
and comparing the difference value
Figure FDA0002992370690000025
Inputting the proportional-integral control module to generate a second virtual impedance correction value Δ L2,viThe calculation formula is as follows:
Figure FDA0002992370690000026
Figure FDA0002992370690000027
wherein,
Figure FDA0002992370690000028
the average value of the virtual impedance of the power generation node to be detected is obtained;
Figure FDA0002992370690000029
the average value of the virtual impedance of the adjacent nodes is taken; l is*To a virtual impedance rating, gLiIn order to adjust the coefficients of the coefficients,
Figure FDA00029923706900000210
is a second proportional control parameter that is,
Figure FDA00029923706900000211
for a second integral control parameter, wiIs a weight coefficient, LviAnd the virtual impedance value of the power generation node to be tested.
4. The distributed inverter control method according to claim 3, wherein in step S3, the average value of the virtual impedances of the power generation nodes to be tested
Figure FDA00029923706900000212
The calculation formula is as follows:
Figure FDA00029923706900000213
wherein N is the total number of power generation nodes of the system, LviIs the virtual impedance of the power generation node to be tested, wi>0。
5. The distributed inverter control method according to claim 2, wherein in step S4, the power generation node outputs a voltageDifference between average value and rated voltage value
Figure FDA00029923706900000214
The formula of (1) is:
Figure FDA00029923706900000215
and comparing the difference value
Figure FDA00029923706900000216
Input into proportional-integral control module to generate first voltage correction value Δ V1The calculation formula is as follows:
Figure FDA0002992370690000031
Figure FDA0002992370690000032
wherein,
Figure FDA0002992370690000033
the average value of the output voltage amplitude of the power generation node to be detected is obtained;
Figure FDA0002992370690000034
the average value of the output voltage amplitude values of the adjacent power generation nodes is obtained;
Figure FDA0002992370690000035
to output a rated value of voltage, gViIn order to adjust the coefficients of the coefficients,
Figure FDA0002992370690000036
is a third proportional control parameter that is,
Figure FDA00029923706900000319
for a third integral control parameter, ViAnd outputting voltage for the power generation node to be tested.
6. The distributed inverter control method according to claim 5, wherein in step S5, a voltage amplitude reference value is outputted
Figure FDA0002992370690000037
The formula of (1) is:
Figure FDA0002992370690000038
and comparing the difference value
Figure FDA0002992370690000039
Input into proportional-integral control module to generate second voltage correction value Δ V2The calculation formula is as follows:
Figure FDA00029923706900000310
wherein, VrefiFor the reference value of the output voltage amplitude, V, of the power generation node i to be testedrefjIs the output voltage amplitude reference value of the generation node j adjacent to i,
Figure FDA00029923706900000311
is a fourth one of the proportional control parameters,
Figure FDA00029923706900000312
the fourth integral control parameter.
7. The distributed inverter control method according to claim 1, wherein in step S6, the corrected virtual impedance value L'viThe calculation formula is as follows:
Figure FDA00029923706900000313
wherein,
Figure FDA00029923706900000314
is the initial value of the virtual impedance of the inverter, Δ L1,viIs a first virtual impedance correction value, Δ L2,viAnd a second virtual impedance modifier value.
8. The distributed inverter control method according to claim 1, wherein in step S7, the corrected output voltage amplitude reference value V'refiThe formula is as follows:
Figure FDA00029923706900000315
wherein,
Figure FDA00029923706900000316
is the output voltage rating; Δ V1Is a first voltage modification value, Δ V2Is a second voltage modification value.
9. The distributed inverter control method according to claim 2, wherein in step S8, the corrected virtual impedance value L'viAnd a corrected output voltage amplitude reference value V'refiAs control input of the inverter, the obtained voltage output formula is:
Figure FDA00029923706900000317
wherein n isiThe reactive droop coefficient is used as the coefficient,
Figure FDA00029923706900000318
as a reactive reference value, ωiFor angular velocity values, i (t) is the output current transient.
10. An inverter distributed control system, comprising:
the reactive distributed controller is used for calculating the difference value between the reactive power output value of the power generation node to be detected and the reactive power output value of the adjacent power generation node, inputting the difference value of the reactive power output values into the proportional-integral control module, and generating a first virtual impedance correction value delta L1,vi；
The virtual impedance recovery distributed controller is used for calculating the difference value between the average value of the virtual impedances of the power generation nodes and the rated value of the virtual impedances, inputting the difference value into the proportional-integral control module and generating a second virtual impedance correction value delta L2,vi；
The voltage recovery distributed controller is used for calculating the difference value between the average value of the output voltage amplitude of the power generation node and the rated value of the output voltage, inputting the difference value into the proportional-integral control module and generating a first voltage correction value delta V1；
A voltage distributed controller for calculating the difference of the output voltage amplitude reference value, inputting the difference into a proportional-integral control module, and generating a second voltage correction value delta V2；
A virtual impedance correction module for correcting the first virtual impedance correction value Δ L1,viSecond virtual impedance correction value DeltaL2,viAnd virtual impedance initial values of the respective inverters
Figure FDA0002992370690000041
Calculating the corrected virtual impedance value L 'of each inverter'vi(ii) a The corrected virtual impedance value L'viAs a control input inverter;
a voltage amplitude reference value correction module for correcting the first voltage correction value Δ V1Second voltage correction value DeltaV2And output voltage rating
Figure FDA0002992370690000042
Calculating corrected output voltage amplitude reference value V 'of each inverter'refi(ii) a The corrected output voltage amplitude value reference value V'refiAs a control input to the inverter.
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