CN106356866A - Automatic voltage control substation device of intelligent substation and control method thereof - Google Patents

Abstract

The invention discloses an automatic voltage control substation device of an intelligent substation and a control method thereof, which belong to the technical field of an electric power system energy management system (EMS), and include a data acquisition module for obtaining all analog quantities and digital quantities of a substation, and a data acquisition module for communicating with the substation. The dispatching master station establishes a communication module for data interaction, a strategy calculation module for automatic voltage control of smart substations, and an instruction output module for automatic voltage control of smart substations; the data acquisition module collects all analog and digital quantities of the substation from the bay layer equipment, The command output module sends the tripping and closing command of the capacitor or reactor switch in the station to the bay layer equipment; the communication module receives the reactive power adjustment command issued by the dispatching master station; The three goals of reasonable gate reactive power and response to scheduling reactive power adjustment instructions. The invention can improve the safety operation rate and voltage operation quality of the reactive power equipment, and eliminate the miscontrol phenomenon of the dispatching master station.

Description

A smart substation automatic voltage control substation device and its control method

technical field

The invention belongs to the technical field of power system energy management system (EMS), and in particular relates to an automatic voltage control substation device of an intelligent substation and a control method thereof.

Background technique

Automatic voltage control (hereinafter referred to as AVC, Automatic Voltage Control) system is an important means to achieve safe (improved voltage stability margin), economical (reduced network loss), and high-quality (improved voltage qualification rate) operation of the transmission network. The AVC system architecture is based on the grid energy management system (EMS), which can use the real-time operation data of the transmission network to scientifically make the best reactive power and voltage adjustment plan from the perspective of overall optimization of the transmission network, and automatically send it to power plants, substations and subordinates The power grid dispatching organization executes.

With the promotion of the "large-scale operation" system of the State Grid Corporation, the substations with a voltage level of 220kV and above under the jurisdiction of the State Grid dispatching centers at all levels currently adopt the centralized control mode of the dispatching center master station for reactive power and voltage control, that is, the dispatching center master station When it is necessary to switch reactive equipment, search in real time according to the grid model of the master station of the dispatching center to find the circuit breaker connected to the reactive equipment, and send the remote control command of closing and opening of the circuit breaker through the EMS system. The monitoring system in the substation receives and executes the remote control instructions of the circuit breaker. In this mode, the substation is only a passive information collection and control actuator.

Years of experience in power grid operation at home and abroad and the occurrence of a large number of power accidents show that the above-mentioned centralized dispatching mode has the following problems:

1) Insufficient accuracy and comprehensiveness of the basic data: When the master station of the dispatching center controls the reactive equipment, it needs to determine the operation of the reactive equipment by collecting various protection signals and equipment status signals related to the reactive equipment. And make a decision on whether to switch. Due to the limited number of signals sent by substations, the signals related to reactive equipment, especially the large number of online status monitoring signals of reactive equipment cannot be sent all. Safe operation brings hidden dangers.

2) Insufficient agility of reactive power and voltage control: The main station of the dispatching center calculates the control strategy based on the measurement data in the EMS system. Limitation, when the voltage exceeds the limit, etc., the master station of the dispatching center cannot respond in time, and there may be a delay of 1-2 minutes, thereby affecting the voltage quality.

3) Insufficient safety of reactive equipment control: In the current AVC remote control mode, it may cause AVC to control other switches by mistake when controlling reactive equipment and cause accidents.

At present, the above hidden safety hazards all rely on the management system and process to eliminate them, requiring the operation and maintenance personnel of the dispatch center to complete a large number of checks, which increases the pressure on personnel and reduces work efficiency.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and propose an automatic voltage control substation device of an intelligent substation and its control method. The present invention can improve the safe operation rate and voltage operation quality of reactive power equipment, and eliminate The phenomenon of miscontrol of capacitors and reactors is suitable for all kinds of smart substations with different wiring methods.

An automatic voltage control substation device of an intelligent substation proposed by the present invention, the device includes:

The data acquisition module used to obtain all analog and digital quantities of the substation,

A communication module for establishing data interaction with the dispatching master station,

A strategy calculation module for automatic voltage control in smart substations,

An instruction output module for automatic voltage control of an intelligent substation; and a real-time database connected to each module; wherein:

The data acquisition module and the instruction output module are all connected to the intelligent substation station control layer MMS (manufacturing message specification) network (the network transmission protocol is an MMS message conforming to the IEC61850 standard); the data acquisition module collects from the interval layer equipment through the MMS network All analog and digital quantities of the substation, including current, voltage, active and reactive data of all equipment such as lines, main transformers, busbars, and capacitive reactance, as well as equipment faults and alarm signals, and collect signals of various protection devices; command output module Send the tripping and closing command of the capacitor or reactor switch in the station to the bay layer equipment through the MMS network; the communication module is connected to the remote control device of the intelligent substation through the Ethernet network (the network transmission protocol is an MMS message conforming to the IEC61850 standard); communication The module sends the remote local signal of the substation, the reactive power of the station can be reduced and increased to the remote control device, and then the remote control device forwards it to the dispatching master station through the dispatching data network; the dispatching master station issues the reactive power adjustment command of the station to the remote control device, and then sent to the communication module by the remote control device; the strategy calculation module achieves the three requirements of qualified voltage in the station, reasonable reactive power at the gate, and response to scheduling reactive power adjustment instructions by calculating the control strategy of the capacitive reactor in the switching station. Objective: Realize data exchange among the data acquisition module, communication module, policy calculation module and instruction output module through real-time database shared memory technology.

The control method using the above-mentioned intelligent substation automatic voltage control substation device proposed by the present invention includes the following steps:

1) The data acquisition module and command output module of the automatic voltage control substation device of the smart substation are connected to the MMS network of the station control layer of the smart substation. The current, voltage, active and reactive data of all equipment such as , busbar, and capacitive reactance, as well as the fault and alarm signals of each equipment, and collect the signals of each protection device; the command output module sends the information of the corresponding switch of the capacitor or reactor in the station to the bay layer equipment Trip and close command;

2) The communication module is connected to the remote control device of the smart substation through the Ethernet network; the communication module sends the remote local signal of the substation, the reactive power of the station can be reduced and increased to the remote control device, and then the remote control device forwards it to the remote control device through the dispatching data network Dispatching master station; the dispatching master station sends the reactive power adjustment command of this station to the remote control device, and then the remote control device sends it to the communication module;

3) The strategy calculation module achieves the three goals of qualified voltage in the station, reasonable reactive power at the gate, and response to dispatching reactive power adjustment instructions by calculating the control strategy of the capacitive reactor in the switching station. The three goals are prioritized in order from high to low:

3.1) Monitor the bus voltage values at all levels in real time, and calculate the emergency control strategy for bus voltages at all levels, that is, withdraw the capacitor or put in the reactor when the bus voltage is higher than the upper voltage limit, and withdraw the reactor when the bus voltage is lower than the lower voltage limit Or put in a capacitor to ensure that the current measured value of the bus voltage is within the given voltage upper and lower limits;

3.2) On the basis of 3.1) that all busbar voltages are qualified, calculate the control strategy for reactive power transfer at the 220kV gate, that is, exit the capacitor or put in the reactor when the reactive power is reversed, so as to ensure that the reactive power at the 220kV main transformer gate is reasonable sex;

3.3) When the conditions of 3.1) and 3.2) can be met, calculate the voltage optimization control strategy, that is, switch capacitors or reactors according to the reactive power adjustment command issued by the dispatching master station; Exit the reactor or invest in the capacitor when the power is turned on; exit the capacitor or invest in the reactor when the reactive power adjustment command is to reduce reactive power, so as to ensure the response to the dispatching reactive power adjustment command;

4) According to the results given by the strategy calculation module (that is, the control strategy), the command output module decomposes into tripping and closing commands corresponding to capacitors or reactor switches and sends them to the bay layer equipment for execution.

Features and beneficial effects of the present invention:

The automatic voltage control substation device of the intelligent substation proposed by the present invention will collect and monitor all analog and digital quantities in the station, and achieve the purpose of holographic monitoring of equipment in the station; Emergencies that exceed the limit are given priority, which improves the speed of emergency handling; the dispatching master station only issues reactive power adjustment instructions, and the substation devices perform control strategy calculations based on dispatching reactive power adjustment instructions and decompose them into specific capacitors or reactors The tripping and closing command of the switch, the master station side no longer needs to maintain the remote control point number of the capacitor or reactor switch, which prevents the miscontrol of the capacitor or reactor switch of the dispatching master station. The invention can improve the safe operation rate and voltage operation quality of reactive power equipment, and is suitable for various intelligent substations with different wiring modes.

Description of drawings

Fig. 1 is a schematic diagram of information interaction of the device of the present invention.

detailed description

A smart substation automatic voltage control substation device and its control method proposed by the present invention are further described in detail through the drawings and specific embodiments as follows:

An automatic voltage control substation device of an intelligent substation proposed by the present invention, its composition and information interaction are shown in Figure 1, and the device includes:

The data acquisition module used to obtain all analog and digital quantities of the substation,

A communication module for establishing data interaction with the dispatching master station,

A strategy calculation module for automatic voltage control in smart substations,

An instruction output module for automatic voltage control of an intelligent substation; and a real-time database connected to each module; wherein:

The data acquisition module and the instruction output module are all connected to the intelligent substation station control layer MMS (manufacturing message specification) network (the network transmission protocol is an MMS message conforming to the IEC61850 standard); the data acquisition module collects from the interval layer equipment through the MMS network All analog and digital quantities of the substation, including current, voltage, active and reactive data of all equipment such as lines, main transformers, busbars, and capacitive reactance, as well as equipment faults and alarm signals, and collect signals of various protection devices; command output module Send the tripping and closing command of the capacitor or reactor switch in the station to the bay layer equipment through the MMS network; the communication module is connected to the remote control device of the intelligent substation through the Ethernet network (the network transmission protocol is an MMS message conforming to the IEC61850 standard); communication The module sends the remote local signal of the substation, the reactive power of the station can be reduced and increased to the remote control device, and then the remote control device forwards it to the dispatching master station through the dispatching data network; the dispatching master station issues the reactive power adjustment command of the station to the remote control device, and then sent to the communication module by the remote control device; the strategy calculation module achieves the three goals of qualified voltage in the station, reasonable reactive power at the gate, and response to dispatching reactive power adjustment instructions by calculating the control strategy of switching capacitive reactors in the station. A goal; the data exchange between the data acquisition module, the communication module, the strategy calculation module and the instruction output module is realized through the real-time database shared memory technology.

The control method using the above-mentioned intelligent substation automatic voltage control substation device proposed by the present invention includes the following steps:

1) The data acquisition module and command output module of the automatic voltage control substation device of the smart substation are connected to the MMS network of the station control layer of the smart substation. The current, voltage, active and reactive data of all equipment such as , busbar, and capacitive reactance, as well as the fault and alarm signals of each equipment, and collect the signals of each protection device; the command output module sends the information of the corresponding switch of the capacitor or reactor in the station to the bay layer equipment Trip and close command;

2) The communication module is connected to the remote control device of the smart substation through the Ethernet network; the communication module sends the remote local signal of the substation, the reactive power of the station can be reduced and increased to the remote control device, and then the remote control device forwards it to the remote control device through the dispatching data network Dispatching master station; the dispatching master station sends the reactive power adjustment command of this station to the remote control device, and then the remote control device sends it to the communication module;

3) The strategy calculation module achieves the three goals of qualified voltage in the station, reasonable reactive power at the gate, and response to dispatching reactive power adjustment instructions by calculating the control strategy of the capacitive reactor in the switching station. The three goals are prioritized in order from high to low:

3.1) Monitor the bus voltage values at all levels in real time, and calculate the emergency control strategy for bus voltages at all levels, that is, withdraw the capacitor or put in the reactor when the bus voltage is higher than the upper voltage limit, and withdraw the reactor when the bus voltage is lower than the lower voltage limit Or put in a capacitor to ensure that the current measured value of the bus voltage is within the given voltage upper and lower limits;

3.2) On the basis of 3.1) that all busbar voltages are qualified, calculate the control strategy for reactive power transfer at the 220kV gate, that is, exit the capacitor or put in the reactor when the reactive power is reversed, so as to ensure that the reactive power at the 220kV main transformer gate is reasonable sex;

3.3) When the conditions of 3.1) and 3.2) can be met, calculate the voltage optimization control strategy, that is, switch capacitors or reactors according to the reactive power adjustment command issued by the dispatching master station; Exit the reactor or invest in the capacitor when the power is turned on; exit the capacitor or invest in the reactor when the reactive power adjustment command is to reduce reactive power, so as to ensure the response to the dispatching reactive power adjustment command;

4) According to the results given by the strategy calculation module (that is, the control strategy), the command output module decomposes into tripping and closing commands corresponding to capacitors or reactor switches and sends them to the bay layer equipment for execution.

The specific implementation of the above device and control method can be realized by a computer installed in the substation, and the control program is pre-stored in the computer and compiled by conventional programming technology.

The smart substation of this embodiment is equipped with a 3-winding main transformer (voltage levels are 220/110/10kV respectively), 3 sets of capacitors and 1 set of reactors are installed under the 10kV low-voltage side busbar, the capacity of the capacitors is 8MVar, and the reactor The capacity is 10MVar; and it is equipped with station control layer MMS network, bay layer equipment and telecontrol device conforming to IEC61850 standard; the upper and lower limits of 220kV bus voltage are 230kV and 222kV, and the upper and lower limits of 110kV bus voltage are 117kV and 112kV, and 10kV bus respectively The upper and lower limits of voltage are 10.7kV and 10.1kV respectively. The specific implementation method is as follows:

1) The data acquisition module and command output module of the automatic voltage control substation device of the smart substation are connected to the MMS network of the station control layer of the smart substation. , bus, capacitive reactance and other equipment current, voltage, active and reactive data, as well as equipment faults and alarm signals, and collect the signals of each protection device; the command output module is decomposed into corresponding capacitors or reactances according to the results given by the strategy calculation module The tripping and closing command of the breaker switch is sent to the bay layer equipment for execution.

2) The communication module is connected to the remote control device of the smart substation through the Ethernet network; the communication module sends the remote local signal of the substation, the reactive power of the station can be reduced and increased to the remote control device, and then the remote control device forwards it to the remote control device through the dispatching data network Dispatching master station; the dispatching master station sends the reactive power adjustment command of this station to the remote control device, and then the remote control device sends it to the communication module;

3) The strategy calculation module achieves the three goals of qualified voltage in the station, reasonable reactive power at the gate, and response to dispatching reactive power adjustment instructions by calculating the control strategy of the capacitive reactor in the switching station. The three goals are prioritized in order from high to low:

3.1) Monitor the bus voltage values at all levels in real time, and calculate the emergency control strategy for bus voltages at all levels, that is, withdraw the capacitor or put in the reactor when the bus voltage is higher than the upper voltage limit, and withdraw the reactor when the bus voltage is lower than the lower voltage limit Or put in a capacitor to ensure that the current measured value of the bus voltage is within the given voltage upper and lower limits;

At 15:43:31 on August 30, 2016, the 220kV bus voltage was 230.29kV, which was higher than the upper voltage limit of 230kV; the number of capacitors put into operation was 0, and the number of reactors put into operation was 0; the control strategy was to put a group of reactors into operation ; After putting in the reactor, the 220kV bus voltage is 229.52kV, and the state of voltage exceeding the limit is eliminated.

3.2) On the basis of 3.1) that all busbar voltages are qualified, calculate the control strategy for reactive power transfer at the 220kV gate, that is, exit the capacitor or put in the reactor when the reactive power is reversed, so as to ensure that the reactive power at the 220kV main transformer gate is reasonable sex;

At 19:02:02 on August 7, 2016, the 220kV bus voltage was 228.05kV, the 110kV bus voltage was 114.53kV, and the 10kV bus voltage was 10.55kV, and the voltages were all qualified; the number of capacitors put into operation was 0, and the reactor was put into operation The number of units is 0; the reactive power sent by the high-voltage bus is 7.5MVar, which is reactive power reverse; the control strategy is to put in a group of reactors; after the reactor is put in, the reactive power sent by the high-voltage bus is -2.3MVar, and the phenomenon of reactive power reverse is eliminated; The 220kV bus voltage is 227.62kV, the 110kV bus voltage is 114.06kV, and the 10kV bus voltage is 10.21kV, and the voltages are still qualified.

3.3) When the conditions of 3.1) and 3.2) can be met, calculate the voltage optimization control strategy, that is, switch capacitors or reactors according to the reactive power adjustment command issued by the dispatching master station; Exit the reactor or invest in the capacitor when the power is turned on; exit the capacitor or invest in the reactor when the reactive power adjustment command is to reduce reactive power, so as to ensure the response to the dispatching reactive power adjustment command.

At 09:42:02 on August 5, 2016, the 220kV bus voltage was 228.57kV, the 110kV bus voltage was 114.23kV, and the 10kV bus voltage was 10.13kV, and the voltages were all qualified; the reactive power sent by the high-voltage bus was -10.5MVar, and there was no The power is reversed; the number of capacitors in operation is 0, and the number of reactors in operation is 1; the dispatching command is to increase reactive power, and the control strategy is to withdraw from a group of reactors; after the reactor is withdrawn, the reactive power sent by the high-voltage bus is -3.6MVar , the reactive power is increased but not reversed; the 220kV bus voltage is 229.01kV, the 110kV bus voltage is 114.59kV, and the 10kV bus voltage is 10.44kV, and the voltages are still qualified.

It can be seen that after exiting the reactor, the 10kV bus voltage is 10.44kV, which is closer to the compromise point of 10.4kV between the upper and lower limits (10.7kV and 10.1kV), which improves the safety of voltage operation; the reactive power sent from -10.5MVar The increase to -3.6MVar means that the reactive power absorbed from the upper-level network is reduced, which also reduces network loss and improves the economy of power grid operation.

Claims (2)

1. a kind of intelligent substation automatism voltage control sub-station device is it is characterised in that this device includes:

For obtaining the data acquisition module of all analog quantitys of transformer station and digital quantity,

For setting up the communication module of data interaction with scheduling station,

For the policy calculation module of intelligent substation automatism voltage control,

Command output module for intelligent substation automatism voltage control；And the real time data being connected with described each module Storehouse；Wherein:

Described data acquisition module, command output module all access intelligent substation station level mms network；Data acquisition module leads to Cross mms network and gather all analog quantitys of transformer station and digital quantity from bay device, including each circuit, main transformer, bus, electric capacity electricity The anti-electric current waiting all devices, voltage, active, idle data and each equipment fault, warning signal, and gather each protection dress Confidence number；Command output module issues the breaker tripping and closing of station inner capacitor or reactor switch by mms network to bay device Order；Described communication module is connected to intelligent substation telemechanical apparatus by Ethernet；Communication module sends son to telemechanical apparatus Stand distant place local signal, our station is idle subtract and can increment, then scheduling station is transmitted to by dispatch data net by telemechanical apparatus； The instruction of our station Reactive-power control is issued to telemechanical apparatus by scheduling station, then is handed down to communication module by telemechanical apparatus；Described strategy By calculating, capacity reactance device in switching station reaches that voltage in station is qualified, critical point is idle rationally to computing module, response scheduling is idle Three targets of regulating command；Logical between described data acquisition module, communication module, policy calculation module and command output module Cross real-time data base share memory technology and realize data exchange.

2. a kind of control method using above-mentioned intelligent substation automatism voltage control sub-station device is it is characterised in that the method Comprise the following steps:

1) data acquisition module of intelligent substation automatism voltage control sub-station device, command output module access intelligent substation Station level mms network, data acquisition module gathers all analog quantitys of transformer station and digital quantity from bay device, including each line The electric current of all devices such as road, main transformer, bus, capacity reactance, voltage, active, idle data and each equipment fault, alarm letter Number, and gather each protection device signal；Command output module issues station inner capacitor to bay device or reactor corresponds to The breaker tripping and closing order of switch；

2) communication module is connected to intelligent substation telemechanical apparatus by Ethernet；It is remote that communication module sends substation to telemechanical apparatus Square local signal, our station are idle subtract and can increment, then scheduling station is transmitted to by dispatch data net by telemechanical apparatus；Scheduling The instruction of our station Reactive-power control is issued to telemechanical apparatus by main website, then is handed down to communication module by telemechanical apparatus；

3) by calculating capacity reactance device control strategy in switching station, policy calculation module reaches that voltage in station is qualified, critical point is idle Rationally, three targets of response scheduling Reactive-power control instruction, three target priorities from high to low, carry out successively:

3.1) monitor bus voltage value at different levels in real time, calculate the out-of-limit emergency control strategy of busbar voltages at different levels, that is, work as mother Line voltage exits capacitor or puts into reactor when being higher than upper voltage limit, exit reactor when busbar voltage is less than lower voltage limit Or input capacitor, to ensure the current measuring value of busbar voltage in given upper voltage limit and lower range；

3.2) 3.1) on the basis of all busbar voltages are qualified, calculate 220kv critical point and reactive power releasing situation control strategy occurs, It is and exit capacitor when reactive power releasing or put into reactor, to ensure the idle reasonability at 220kv main transformer critical point；

3.3) 3.1) and 3.2) condition can meet in the case of, calculate voltage optimization control strategy, that is, according to scheduling master Reactive-power control instruction switched capacitor or reactor that station issues；When Reactive-power control instructs as exiting reactor or throwing when rising idle Enter capacitor；When Reactive-power control instructs as exiting capacitor when dropping idle or putting into reactor, to ensure the idle tune of response scheduling Section instruction；

4) command output module is decomposed into the jump of corresponding capacitor or reactor switch according to the result that policy calculation module is given Combined floodgate order is issued to bay device execution.