CN201035433Y - Voltage regulator with bidirectional energy flow - Google Patents
Voltage regulator with bidirectional energy flow Download PDFInfo
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- CN201035433Y CN201035433Y CNU2007201062693U CN200720106269U CN201035433Y CN 201035433 Y CN201035433 Y CN 201035433Y CN U2007201062693 U CNU2007201062693 U CN U2007201062693U CN 200720106269 U CN200720106269 U CN 200720106269U CN 201035433 Y CN201035433 Y CN 201035433Y
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Abstract
本实用新型公开了一种能量双向流动的电压调节器，它采用数字信号处理器DSP实时检测输入电网电压和电压相位，当输入电网电压发生变化时，DSP控制器控制双PWM变换器实现能量双向流动，产生一个相对应的电压对输入电压进行补偿，自动调节电网输入电压，抑制电网电压跌落、上升对电力用户的干扰，保持负载侧电压稳定，实现功率因素几乎为1，提高配电系统的电能质量，具有响应速度快，可连续动态调节电压，调压精度高，保护功能全，可靠性好和节约能源的特点。可替代各种机械式有载调压变压器以及可控硅切换的无触点交流稳压器，广泛应用于通讯设备、广播电视、工业生产线、数控机床以及轻工纺织、医疗设备、楼宇宾馆、电脑机房等交流稳压场所。
The utility model discloses a voltage regulator with two-way flow of energy, which uses a digital signal processor DSP to detect the input grid voltage and voltage phase in real time, and when the input grid voltage changes, the DSP controller controls double PWM converters to realize energy bidirectional It generates a corresponding voltage to compensate the input voltage, automatically adjusts the grid input voltage, suppresses the interference of grid voltage drop and rise to power users, keeps the load side voltage stable, realizes a power factor of almost 1, and improves the power distribution system. Power quality has the characteristics of fast response, continuous and dynamic voltage adjustment, high voltage adjustment accuracy, complete protection functions, good reliability and energy saving. It can replace various mechanical on-load voltage regulating transformers and non-contact AC voltage regulators switched by thyristors. It is widely used in communication equipment, radio and television, industrial production lines, CNC machine tools, light industry textiles, medical equipment, buildings, hotels, Computer rooms and other AC voltage stabilization places.
Description
Technical field
The utility model relates to the AC voltage regulator of power distribution network, especially relates to the voltage regulator of energy two-way flow.
Background technology
Because the line voltage electricity capacity changes at any time, there are a large amount of nonlinear loads to insert electrical network, voltage fluctuation is very big, harmonic pollution is very serious, thereby influence user's the electricity quality of using, its frequent mistake that shows as voltage owes, instantaneously fall, surge and spike disturb more, even more serious in some remote districts.Along with science and technology and expanding economy, a large amount of consumers of hi-tech industry and important department are more and more higher to the requirement of power supply quality, and electric voltage dropping has become that the many consumers of influence are normal, the great power quality problem of safe operation.During for example modern industry is produced, electric voltage dropping will cause that product quality descends, even cause production run to be interrupted, thereby cause enormous economic loss.Therefore, suppress electric voltage dropping, reduce interference, improve the dynamic power quality of distribution system, become the very urgent task that power industry and research department face power consumer.Several AC voltage regulator types and shortcoming thereof that prior art is used for burning voltage are as follows:
(1) transformer voltage ratio adjusting type voltage stabilizer: primary is provided with a plurality of taps, and each relay of tap serial connection or bidirectional triode thyristor come regulation voltage by changing tap.The controllable silicon of voltage stabilizer or relay directly are serially connected in the main circuit, load current all flows through from it, transition in the load current, fluctuation very easily damage controllable silicon, the controllable silicon temperature rise, operating mode is abominable, performance degradation, poor reliability, the controllable silicon surplus of high capacity voltage stabilizer is determined with heat dissipation design difficulty bigger;
(2) contactless compensation type ac voltage stabilizer: as the contactless automatic pressure regulating device of 10KV substation transformer of patent No. CN 2534660, when between different contacts, switching, because thyristor is not to turn-off immediately, so there is circulation between the contact, it is improper to control, and is easy to burn device; Because thyristor is the half control device, response speed is restricted, and thinks to improve once more relatively difficulty, usually more than 10 milliseconds; Because thyristor is that directly string is in main circuit, the magnitude of voltage that bears requires the volume ratio of device bigger than higher, causes cost to increase; The noncontacting switch ULTC of patent No. CN 2593328, the many groups mechanical type shunting switch that connects between two phase windings is substituted with the contactless transwitch of many groups, must adopt a large amount of transwitch devices, not only volume is big, and has reduced the reliability of this ULTC; Two patents all adopt two phase windings to organize the pressure regulation of the existing level of tap real more, and the pressure regulation precision is restricted.Their common drawback is that voltage has level to regulate, can not continuous voltage regulating, and the pressure regulation precision is not high, switches the short circuit accident that tapping easily causes the conducting of thyristor common-mode, and the response time is usually more than 10 milliseconds;
(3) PWM contravariant AC voltage regulator:, can realize that voltage regulates continuously, but its topological structure is very complicated as the contactless type AC voltage regulator of patent No. ZL99244189.7, wayward, especially need to solve the midpoint potential equilibrium problem, realize that difficulty is big, influence its marketable value.
Summary of the invention
The purpose of the present utility model is in order to overcome the above-mentioned defective and the deficiency of prior art, a kind of voltage regulator of energy two-way flow is proposed, adopt the intelligent controller of digital signal processor DSP, detect the input line voltage in real time, when the input line voltage changes, the two pwm converters of dsp controller control make the voltage source that seals in distribution system produce a corresponding dynamic voltage, input voltage is compensated, automatically regulate distribution voltage, suppressing line voltage falls, rising is to the interference of power consumer, keep load voltage stable, improve the quality of power supply of distribution system user side.The voltage regulator of energy two-way flow falls, rises to fundamental purpose with bucking voltage, so that the voltage disturbance that suppresses distribution system is to the user side effects of load, when supply voltage changes, the voltage regulator of energy two-way flow will be made response rapidly, can in several milliseconds, produce a alternating voltage and come the bucking-out system electric voltage dropping, load voltage is stabilized in normal value with synchronized.
The present utility model purpose is to be achieved through the following technical solutions:
The voltage regulator of energy two-way flow of the present utility model, comprise intelligent controller 1, dynamic power regulator 2, serial connection compensator transformer 3, sine wave filter 4 and energy storage inductor L5, it is characterized in that described dynamic power regulator 2 is transducers that an energy can two-way flow, its switch control end connects the drive output of intelligent controller 1, an outgoing side of energy two-way flow transducer 2 connects the simple of serial connection compensator transformer 3, one end of its another outgoing side connects energy storage inductor L5, the end of energy storage inductor L5 links to each other with the ac output end of energy two-way flow transducer 2, the other end connects the AC load side, the secondary distribution network major loop that is connected on of serial connection compensator transformer 3, positive and negative compensation is carried out in fluctuation to alternating voltage, and sine wave filter 4 is attempted by the AC load side;
Described intelligent controller 1 is made of with display 15 DSP control panel 10, dsp controller 11, voltage and current sample detecting circuit 12, pwm pulse generator 13 and keyboard 14; The sampling end of voltage and current sample detecting circuit 12 connects the distribution network input end, its output terminal connects the AD conversion input port of Based Intelligent Control plate 10, and dsp controller 11 links to each other with pwm pulse generator 13, keyboard 14 and display 15 respectively by corresponding interface; The voltage and current sampled signal send dsp controller 11 to handle after the AD conversion, and dsp controller control pwm pulse generator 13 generates driving pulse Ug
1～Ug
8
Described energy two-way flow transducer 2 comprises two H bridge-type pulse width modulated inverter PWM1, the PWM2 and the storage capacitor C that are made of 4 IGBT power devices
dThe gate pole trigger end of PWM1 transducer 21 and PWM2 transducer 22 each IGBT device for power switching is corresponding with 8 driving pulse output terminals of intelligent controller PWM drive-pulse generator 13 respectively, and be connected the dc bus side of PWM1 transducer 21 and PWM2 transducer 22 and storage capacitor C by the power device drive plate
dBe connected in parallel, the conversion side of PWM2 transducer is through energy storage inductor L incoming transport load-side.
Pulse width modulated inverter PWM1 is triggered by Ug1～Ug4 driving pulse that DSP Based Intelligent Control plate takes place, PWM2 is triggered by Ug5～Ug8 driving pulse that DSP Based Intelligent Control plate takes place, the PWM1 transducer is mainly controlled the inflow and the outflow of input electrical network energy, the PWM2 transducer mainly is that inflow and outflow that electrical network outputs to load energy are regulated, also be that PWM1 transducer and PWM2 transducer are operated in complementary state, when line voltage raises, the PWM1 transducer is in rectification state, the PWM2 transducer is in inverter mode, this moment, the energy flow direction flowed to load for electrical network, and when civil power lands, the PWM1 transducer is in inverter mode, the PWM2 transducer is in rectification state, and this moment, the energy flow direction was that load flow is to electrical network.Series compensation transformer Tr is subjected to the PWM1 convertor controls to realize the compensating action of step-down, sine wave filter is the high-frequency impulse and the low-order harmonic of the generation of filtering PWM1 transducer effectively, the PWM1 transducer loose is very little, make power factor of electric network almost reach 1, thoroughly solve of harmonic interference and the pollution of PWM1 transducer the electrical network output voltage.Capacitor C
dFor PWM1 transducer and PWM2 transducer provide energy storage and level and smooth filter action, and make two transducer decouplings, in two pwm converter conversion processes, the compensation energy is exchanging two-way flow between input side and the AC load side, to capacitor C d charge or discharge, simultaneously to energy storage inductor L energy storage filtering or release can filtering, thereby keep dc bus side voltage stable and to keep AC load side voltage stable.
The voltage regulator of energy two-way flow can be single-phase or three-phase, and the voltage regulator of the energy two-way flow of three-phase comprises H bridge-type pulse-width modulation PWM 1 transducer 24, PWM2 transducer 25 and the storage capacitor C that two three-phases that are made of 6 IGBT power devices are exported
dThe voltage regulator of three-phase energy two-way flow also has three serial connection compensator transformer Tr
A31, Tr
B32, Tr
C33 are serially connected in respectively in the bus of three phase power distribution networks, also have three sine wave filter SF
A41, SF
B42, SF
C43 are attempted by respectively between the bus and zero line of three-phase alternating current load-side; The gate pole trigger end of PWM1 transducer 24 and PWM2 transducer 25 each IGBT device for power switching is corresponding with 12 driving pulse output terminals of the PWM drive-pulse generator 13 of intelligent controller 1 respectively, is connected by the power device drive plate; The dc bus side of PWM1 transducer 23 and PWM2 transducer 24 and storage capacitor C
dBe connected in parallel, also have three energy storage inductor L
A51, L
B52, L
C53 are serially connected in respectively between the interchange outgoing side and three-phase alternating current load-side of PWM2 transducer 25.
Intelligent controller can be exported Ug1～Ug6 and two groups of PWM trigger pulses of Ug7～Ug12, pulse width modulated inverter PWM1 transducer 24 is triggered by Ug1～Ug6 driving pulse that DSP Based Intelligent Control plate takes place, PWM2 transducer 25 is triggered by Ug7～Ug12 driving pulse that DSP Based Intelligent Control plate takes place, and drives the control that PWM1, PWM2 realize three-phase energy Flow and compensation magnitude respectively.
Voltage and current sample detecting circuit 12 is mutual inductor or photoelectrical coupler sensing sources and the testing circuits that are connected on the distribution network ac input end, and detection of grid instantaneous voltage and voltage-phase obtain voltage swing signal and synchronizing signal; The voltage and current sample detecting circuit 12 of the voltage regulator of three-phase energy two-way flow is mutual inductor or the photoelectrical coupler sensing sources that is connected on the three phase power distribution networks input end, detect the instantaneous voltage and the voltage-phase of three phase network, obtain three phase network voltage swing signal and synchronizing signal.
The mutual inductor of the voltage regulator of the energy two-way flow of single-phase and three-phase or photoelectric sensing source acquisition testing are to the instantaneous voltage and the voltage-phase of electrical network input end, handle through intelligent controller AD conversion and dsp controller 11, the Push And Release of control H bridge-type pulse width modulated inverter PWM1 and each IGBT power device of PWM2, thereby the duty of control PWM1 and PWM2 and compensation energy size and flow direction, the voltage-phase of gathering the interchange input is in order to guarantee that bucking voltage is identical with the zero crossing of AC-input voltage.
Described intelligent controller 1 also has telecommunication circuit 16 and holding circuit 17, and dsp controller 11 is connected with holding circuit 17 with telecommunication circuit 16 respectively with the control data mouth by the corresponding communication interface.
Holding circuit mainly is by the detection to signals such as overvoltage, under-voltage, overcurrents; be used to protect the power device of the voltage regulator of energy two-way flow; after signals such as detected overvoltage, under-voltage, overcurrent send dsp controller to handle; send the protection control signal to power device again; on display 15, show the code that detects fault-signal simultaneously, and can send failure code information to upper distribution management system by telecommunication circuit 14.
The switch power device of the voltage regulator of energy two-way flow determines that by the power capacity of load electrical equipment plurality of specifications can be arranged; The series compensation transformer is the step-down transformer of no-load voltage ratio, and it is configured according to corresponding current capacity of load electrical equipment and compensation range, and the specification of three series compensation transformer configuration of the voltage regulator of three-phase energy two-way flow is identical.
3 step-downs of series compensation transformer and buffer action, thus make the used device volume ratio of PWM1 transducer power system capacity little, and parts selection is easier to.
The power device of single-phase energy two-way flow transducer can be the Intelligent Power Module IPM of two single-phase special uses, the power device of the energy two-way flow transducer of three-phase also can be the Intelligent Power Module IPM of two three-phase special uses, as preferably, adopt the IPM Intelligent Power Module of Mitsubishi.
Each Intelligent Power Module IPM is inner integrated at a high speed, the gate-drive of the igbt chip of low consumption and optimization and overcurrent, short circuit, under-voltage and overheating protection circuit, and it has improved the Performance And Reliability of system, has reduced system development costs.
The utility model is adjusted and is compensated the lifting difference of AC network input voltage, need not to bear the whole voltages of load, but pwm converter power device reasonable disposition, the cost performance height, parts selection is easy, can produce the continuously adjustable bucking voltage of amplitude, realization is to electrical network input voltage step-less adjustment, and converter using is controlled device IGBT entirely and constituted, and dynamic response is fast, can about 2 milliseconds, make voltage obtain voltage stabilizing, and the reliability height.
Beneficial effect of the present utility model:
(1) operating mode is good, and temperature rise is low, performance optimization, and the reliability height, design difficulty is less;
(2) voltage step-less adjustment, continuous voltage regulating, pressure regulation precision height is difficult for causing the device short circuit accident, and response speed is fast, and the response time has only several milliseconds;
(3) two pwm converters have transducer and rectifier way traffic function, but both stable DC busbar voltage, reducing mains by harmonics disturbs, can be converted into electric energy to regenerated energy again and send electrical network back to, power factor (PF) is near 1, and energy-saving voltage regulator structure is uncomplicated, easy to control, the realization difficulty is little, the marketable value height.
Description of drawings
Fig. 1 is the composition frame chart of the voltage regulator of the utility model energy two-way flow;
Fig. 2 is the electric theory diagram of the voltage regulator of the single-phase energy two-way flow of the utility model embodiment;
Fig. 3 is the electric theory diagram of the voltage regulator of the utility model embodiment three-phase energy two-way flow;
Fig. 4 is that the voltage regulator electrical network of the single-phase energy two-way flow of the utility model embodiment is worked as input voltage U
iReverse compensation voltage waveform view during rising;
Fig. 5 is that the voltage regulator electrical network of the single-phase energy two-way flow of the utility model embodiment is worked as input voltage U
iSame-phase compensation voltage waveform view during reduction.
Among Fig. 3: 31-Tr
ABe A be in series compensator transformer, 31-Tr
BBe B be in series compensator transformer, 31-Tr
CBe C be in series compensator transformer, 41-SF
ABe A phase sine wave filter, 42-SF
BBe B phase sine wave filter, 43-SF
CBe C phase sine wave filter, 51-L
ABe A phase energy storage inductor, 52-L
BBe B phase energy storage inductor, 53-L
CBe C phase energy storage inductor.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
The composition frame chart of the voltage regulator of energy two-way flow of the present utility model as shown in Figure 1, the voltage regulator of single-phase energy two-way flow is made of intelligent controller, dynamic power regulator, serial connection compensator transformer, sine wave filter and compensating inductance five parts.The dynamic power regulator is an energy two-way flow transducer.
Fig. 2 has provided the electric theory diagram of the voltage regulator embodiment of the single-phase energy two-way flow of the utility model.Among the embodiment:
The voltage-regulation process of the voltage regulator of energy two-way flow stream is exactly the process of voltage stabilizing and the reasonable feedback of energy, and the concrete course of work and bidirectional energy flow direction are as follows:
As electrical network input voltage U
iDuring rising Δ U, the voltage and current sample detecting electric circuit inspection of dsp controller raises to the electrical network input voltage, its output send dsp controller to handle through AD conversion mouth, when detected value during greater than the input voltage detection signal set, by the SVPWM control algolithm, the control pwm pulse generator produces relative trigger pulse U
G1, U
G2, U
G3, U
G4, the T of driving PWM1 transducer
1, T
2, T
3, T
4Its AC side voltage U is controlled in opening and turn-offing of power device
EPWMAmplitude and phase place, be series compensation transformer T in the AC side of PWM1 transducer
rThe simple generation phase place voltage U opposite with the AC-input voltage phase place
EPWM, be coupled to T
rSecondary, obtain the voltage U that a phase place and AC-input voltage are opposite, amplitude is identical with the AC-input voltage lift-off value
R2, it is-Δ U and electrical network input voltage U
iCarry out the reverse compensation stack, thereby keep load voltage U
oConstant, referring to Fig. 4 electrical network input voltage U
iReverse compensation oscillogram during rising.
During above-mentioned electrical network input voltage rising Δ U, the PWM1 transducer that reverse compensation voltage is provided is to be operated in rectification state, and energy is from the AC side of PWM1 transducer, through series compensation transformer T
rThe power device of simple and PWM1 transducer flows to the storage capacitor C of dc bus side
dThereby, make DC bus-bar voltage U
dRise, dsp controller detects DC bus-bar voltage by the DC bus-bar voltage testing circuit and rises, and by the SPWM control algolithm, the control pwm pulse generator produces relative trigger pulse U
G5, U
G6, U
G7, U
G8, the T of driving PWM2 transducer
5, T
6, T
7, T
8Opening and turn-offing of power device is in the PWM2 transducer of inverter mode, energy from storage capacitor C
dSide is transferred to the AC side of PWM2 transducer, and feeds back to the electrical network load-side by inductance L, and compensation is because the energy that PWM1 transducer reverse compensation is absorbed.
As electrical network input voltage U
iWhen reducing Δ U, the voltage and current sample detecting electric circuit inspection of dsp controller reduces to the electrical network input voltage, its output send dsp controller to handle through AD conversion mouth, its detected value is less than the input voltage detection signal of setting value, by the SVPWM control algolithm, the control pwm pulse generator produces relative trigger pulse U
G1, U
G2, U
G3, U
G4, the T of driving PWM1 transducer
1, T
2, T
3, T
4Its AC side voltage U is controlled in opening and turn-offing of power device
EPWMAmplitude and phase place, be series compensation transformer T in the AC side of PWM1 transducer
rThe simple generation phase place voltage U identical with the AC-input voltage phase place
EPWM, be coupled to T
rSecondary, obtain a voltage U that phase place is identical with AC-input voltage, amplitude is identical with the AC-input voltage lift-off value
R2, it is Δ U and electrical network input voltage U
iCarry out the same-phase compensation stack, thereby keep load voltage U
oConstant, referring to Fig. 5 electrical network input voltage U
iForward compensates oscillogram mutually during reduction.
Above-mentioned electrical network input voltage reduces, and provides the PWM1 transducer of same-phase compensation voltage to be operated in inverter mode, and energy is from the storage capacitor C of dc bus side
dFlow to the AC side of PWM1 transducer, like this DC bus-bar voltage U
dTo descend, dsp controller detects DC bus-bar voltage by the DC bus-bar voltage testing circuit and descends, and by the SVPWM control algolithm, pwm pulse generator produces relative trigger pulse U
G5, U
G6, U
G7, U
G8, driving circuit drives the T of PWM2 transducer
5, T
6, T
7, T
8Opening and turn-offing of power device is in the PWM2 transducer of rectification state at this moment, and energy is transferred to PWM2 transducer AC side from electrical network AC load side by inductance L, flows to dc bus storage capacitor C by PWM2 transducer AC side again
d, replenish because the energy that PWM1 transducer same-phase compensation is consumed, make energy from the AC load effluent to the electrical network AC side.
In sum, when input voltage raise, the PWM1 transducer carried out reverse compensation to the AC-input voltage that raises, and dsp controller control PWM1 transducer is operated in rectification state, the PWM2 transducer is operated in inverter mode, and energy is from grid side process series compensation transformer T
r, PWM1 transducer, storage capacitor C
d, PWM2 transducer and inductance L flow to load-side.When input voltage reduces, the PWM1 transducer carries out same-phase compensation to the AC-input voltage that reduces, dsp controller control PWM1 transducer is operated in inverter mode, and the PWM2 transducer is operated in rectification state, and energy is from load-side process inductance L, PWM2 transducer, storage capacitor C
d, PWM1 transducer and series compensation transformer T
rFlow to grid side.The process of the energy two-way flow of voltage regulator has realized the load side voltage voltage stabilizing, and the reasonable feedback of energy carries out energy-conservationly, and makes power factor (PF) near 1.
The electric theory diagram of the voltage regulator embodiment of the utility model three-phase energy two-way flow as shown in Figure 3.As preferably, dsp controller adopts Ti company, and model is a TMS320LF2407 three-phase special integrated circuit, and the IGBT power device adopts Mitsubishi, and model is the IPM module of PM50RL120.
The voltage regulator of three-phase energy two-way flow adopts the TMS320LF2407 type dsp chip microprocessor of many group bus parallel high-speed cruisings, fast operation.Utilize the integrated peripheral hardware of its special inside: 32KB Flash flash memory, 1.5K digital data storer, 10 analog to digital converters, the synchronous serial Peripheral Interface, asynchronous serial communication interface and CAN bus communication interface, have 4 kinds of power-down mode emulation, the task manager of PWM control and 12 road PWM output, 4 general purpose timers, 9 comparing units, its digital to analog converter can be handled 16 tunnel simulating signals, can be simultaneously to 2 road analog signal samplings and conversion, A/D switching time is less than 1 μ s, the exportable asymmetric or symmetrical PWM trigger pulse of PWM wave generating unit, thereby, regulator configuration is terse, the good and reliability height of system flexibility.
Adopt Mitsubishi Intelligent Power Module IPM50RSL120, there are 6 IGBT and parallel connection fly-wheel diode thereon in its inside, the pwm converter that can form three-phase bridge, also be integrated with IGBT driving circuit and detecting unit on the Intelligent Power Module, when detecting arbitrary abnormal conditions such as short circuit, overcurrent, under-voltage, excess temperature, the F of IPM module
0Signal is added to the power drive protection pin of DSP after by light-coupled isolation, realizes the corresponding protection function.
As preferably, voltage and current sample detecting circuit employing model is that voltage transformer (VT) or the employing model of LV25-P is high speed, the high linearity photoelectrical coupler of TLP559, change the forceful electric power signal of grid side alternating voltage or busbar voltage into weak electric signal linearly, this signal is handled through AD conversion and dsp controller, send pwm pulse generator to form driving pulse, for the feedback electric current of energy two-way flow transducer provides control signal, and the duty of the two pwm converters of decision and the size and the direction of feedback energy.
Two pwm converter energy Flow control structures that the voltage regulator of three-phase energy two-way flow adopts PWM1 transducer and PWM2 transducer to form, circuit constitutes simple, the energy two-way flow, and dynamic response time is short, the power factor of feasible system approximates 1, eliminates side harmonics and pollutes.The two PWM control structures of transducer, the three-phase current of gathering is to have with the synchronous instantaneous value current signal of frequency with line voltage, relatively generate 6 road pwm switching signals through dsp controller and three-phase actual current, the turn-on and turn-off of on-off element in the control pwm converter, make actual current follow the setting value electric current, the grid side power factor approximates 1.
The two PWM control procedures of three-phase energy two-way flow and single-phase basic identical.
When certain phase electrical network input voltage is on the low side, energy by AC network through the energy storage filter capacitor C of the PWM1 of rectification state transducer to the centre
dCharging, the PWM2 transducer passes through inductance L, PWM2 transducer, storage capacitor C with energy from load-side under the control of PWM driving pulse
d, PWM1 transducer and series compensation transformer T
rFlow to grid side.
When certain phase electrical network input voltage is higher, because the energy inertia effect of load control PWM1 transducer enters rectification energy storage state, its regenerated energy on-off element and fly-wheel diode in transducer charge to the energy storage filter capacitor, DC bus-bar voltage is raise, and on-off element passes through PWM1 transducer, series compensation transformer T with energy from grid side in the PWM2 rectifier under dsp controller control at this moment
r, storage capacitor C
d, PWM1 transducer and inductance L flow to load-side, finishes the two-way flow of energy.Because rectification state pwm converter closed-loop control effect makes power network current and voltage with the frequency same-phase, improve the power factor of system simultaneously, eliminated the side harmonics pollution.
Adopt digital signal processor DSP to detect the input line voltage in real time; when the input line voltage changes; the two pwm converters of dsp controller control are realized the energy two-way flow; producing a corresponding voltage compensates input voltage; automatically regulate the electrical network input voltage; suppressing line voltage falls; rising is to the interference of power consumer; keep load side voltage stable; realize that power factor (PF) is almost 1, improve the quality of power supply of distribution system, it is fast to have response speed; dynamic adjustments voltage continuously; pressure regulation precision height, defencive function is complete, the characteristics of good reliability and energy savings.The contactless AC voltage regulator that alternative various mechanical type ULTC and controllable silicon switch is widely used in AC voltage-stabilizing places such as communication apparatus, radio and television, industrial production line, numerically-controlled machine and industry light industry textile industry, Medical Devices, building hotel, Computer Facilities.
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