CN204118744U - For the major-minor Collaborative Control device of wind energy turbine set Static Var Compensator - Google Patents
For the major-minor Collaborative Control device of wind energy turbine set Static Var Compensator Download PDFInfo
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- CN204118744U CN204118744U CN201420492118.6U CN201420492118U CN204118744U CN 204118744 U CN204118744 U CN 204118744U CN 201420492118 U CN201420492118 U CN 201420492118U CN 204118744 U CN204118744 U CN 204118744U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to a kind of major-minor Collaborative Control device for wind energy turbine set Static Var Compensator, comprising: input circuit is to comparison circuit and voltage regulator circuit input V
n, to Reactive-power control circuit input Static Var Compensator perception branch current; Comparison circuit compares V
n, major-minor control switches upper and lower limit magnitude of voltage V
minand V
max; If V
min<V
n<V
max, diverter switch conducting, comparison circuit exports V
n; Otherwise, diverter switch conducting, comparison circuit exports A; The V that Reactive-power control circuit exports according to comparison circuit
nthe first controller output admittance value B is inputted to output circuit
l1; The value that voltage regulator circuit exports according to comparison circuit inputs second controller output admittance value B to output circuit
l2; Output circuit is according to B
l1control SVC runs on the permanent idle state of a control of master control-perceptual branch road; Or according to B
l2control SVC runs on auxiliary control-constant voltage state of a control.
Description
Technical Field
The utility model relates to a static var compensator field, in particular to main and auxiliary cooperative control device to wind-powered electricity generation field static var compensator.
Background
The wind power resources in China are rich and are mainly distributed in northwest, northwest and northeast regions, and the wind power generation site is far away from the main power consumption site, so that a large-scale and long-distance delivery wind power mode is formed. In addition, the wind power access ground system is weak in structure, short-circuit capacity is small, and the problem of voltage stability in the system is more and more prominent. In order to solve the problem and improve the voltage stability level of the system, the wind power plant is generally selected to be provided with a dynamic reactive power compensation device on the low-voltage side in a centralized manner so as to meet the reactive power requirement of the whole wind power plant. Among them, SVC (Static Var Compensator ) is widely used in wind farms due to its characteristics of mature technology and fast response.
However, it is found by summarizing multiple fan grid disconnection accidents that, due to poor performance of an SVC control strategy in the wind farm at present, the SVC cannot perform its positive regulation function after the system is disturbed, but further deteriorates the voltage stabilization condition of the system.
Currently, the most studied in terms of SVC control strategy is the constant voltage control scheme. Fig. 1 is a schematic diagram of dynamic regulation characteristics in a conventional SVC constant current control mode. In FIG. 1, SVC capacity range [ Q ] at wind farmcmax,QLmax]In the wind power system, the voltage can be stabilized at VL,VH]Therein, VL、VHThe pressure regulating requirement is set according to the normal operation condition of the system. Therefore, in the capacity range, the SVC has a good effect of stabilizing the system voltage. QLmaxIndicating SVC regulated reactive inductive limits, QcmaxIndicating SVC regulation reactive capacity limit, VHRepresenting the maximum adjustable voltage, V, within the SVC capacityLRepresenting the minimum adjustable voltage, V, within the SVC capacity1Representing the actual operating voltage, Q, of the SVCLRepresenting the reactive power of the SVC actual operating point. However, this control method still has the following disadvantages: 1) under normal conditions, the wind power plant requires the SVC to operate in a floating or inductive state so as to provide enough inductive reactive power when the system fails, and at the moment, the loss in the wind power plant is increased, so that the requirement of economic operation of the wind power plant is difficult to meet; 2) SVC constant voltage control easily causes reactive large fluctuation in a system, and threatens the system safety; 3) when the SVC regulation reactive power exceeds the capacity limit of the SVC regulation reactive power, the SVC regulation reactive power cannot play a normal regulation role, and the voltage continuously fluctuates greatly.
Another SVC control strategy is to take SVC inductive branch reactive power constancy as the final control target,the capacitive branch of the SVC is not influenced by a controller, and is directly manually switched on or off by operators according to the voltage regulation requirement of the system, so the control mode can reduce the circulation loss generated in the SVC under the normal operation condition and meet the requirement of the economic operation of a wind power plant. However, the control method has the disadvantage that the system voltage sensitivity is remarkably increased, so that the system voltage is prone to long-time and large-amplitude climbing or dropping after disturbance, which is also the main reason that the SVC cannot play a positive regulation role in the high-voltage and low-voltage off-line process of the fan. Fig. 2 is a graph showing the effect of conventional SVC inductive branch constant reactive power control on the system voltage sensitivity. When the system voltage is low, the system voltage is firstly increased from A to B after the capacitor is put into the system voltage, and then the system voltage is climbed to C for a long time; when the system voltage is higher, the system voltage drops from A to B1Then fall to C for a long time1. In both cases the final regulated voltage is out of the normal range, which would seriously threaten the system safety.
Therefore, from the perspective of power system source-grid coordination, how to improve the control strategy performance of the SVC in the wind power system is to exert the active effect of flexibly adjusting the reactive power of the wind power system when the wind power system is disturbed, so that the disturbed system voltage is free from large fluctuation, which is a problem that needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem, the utility model provides a main and auxiliary cooperative control device to wind-powered electricity generation field static var compensator when satisfying wind-powered electricity generation field economic operation requirement, effectively avoids fluctuation by a wide margin of system voltage behind the perturbation, stabilizes system voltage in the requirement range.
In order to achieve the above object, the utility model provides a main and auxiliary cooperative control device to wind-powered electricity generation field static var compensator, the device includes:
the device comprises an input circuit, a comparison circuit, a voltage regulation circuit, a reactive power regulation circuit and an output circuit; wherein,
the input circuit is used for inputting the voltage value V of the grid-connected point of the static var compensator to the comparison circuit and the voltage regulation circuitNInputting inductive branch current of the static reactive compensator to the reactive power regulating circuit;
the comparison circuit is used for comparing the voltage value V of the grid-connected point of the static var compensatorNMain and auxiliary control switching lower limit voltage value VminMain and auxiliary control switching upper limit voltage value Vmax(ii) a If Vmin<VN<VmaxIf the static var compensator is in the off state, the switch is switched on, and the comparison circuit outputs the voltage value V of the grid-connected point of the static var compensatorNTo the reactive power regulating circuit; if VN>VmaxThe switch is turned on, and the comparison circuit outputs Vmax(ii) a If VN<VminThe switch is turned on, and the comparison circuit outputs Vmin；
The reactive power regulating circuit is used for regulating the voltage value V of the grid-connected point of the static reactive power compensator according to the voltage value V output by the comparison circuitNInputting a first controller output admittance value to the output circuit;
the voltage regulating circuit is used for regulating the voltage according to the V output by the comparison circuitmax/VminInputting a second controller output admittance value to the output circuit;
the output circuit is used for controlling the static reactive power compensator to operate in a main control-inductive branch constant reactive power control state according to the output admittance value of the first controller; or
And controlling the static var compensator to operate in an auxiliary control-constant voltage control state according to the output admittance value of the second controller.
Preferably, the input circuit comprises a first measurer and a second measurer; the first measurer is used for measuring the voltage value of the low-voltage side of the wind power plant and measuring the voltage value V of the grid-connected point of the static reactive power compensatorNInput to the comparison circuit and the voltage regulation circuit(ii) a And the second measurer is used for measuring the inductive branch current of the static reactive compensator and inputting the measured value to the reactive power regulating circuit.
Preferably, the comparison circuit comprises a switch and a comparator; wherein, the first input end of the comparator inputs the voltage value V of the grid-connected point of the static var compensatorNThe second input end of the comparator inputs a main and auxiliary control switching lower limit voltage value VminThe third input end of the comparator inputs a main and auxiliary control switching upper limit voltage value VmaxSaid comparator comparing VN、Vmin、VmaxIf V ismin<VN<VmaxIf the static var compensator is in the off state, the switch is switched on, and the comparison circuit outputs the voltage value V of the grid-connected point of the static var compensatorNTo the reactive power regulating circuit; if VN>VmaxThe switch is turned on, and the comparison circuit outputs Vmax(ii) a If VN<VminThe switch is turned on, and the comparison circuit outputs Vmin。
Preferably, the reactive power adjusting circuit comprises a first gain circuit, a multiplier, a first adder and a second gain circuit; the input end of the first gain circuit inputs the measured value of a second measurer; the output end of the first gain circuit is connected with the first input end of the multiplier, and the second input end of the multiplier inputs the voltage value V of the grid-connected point of the static var compensator output by the comparison circuitNThe output end of the multiplier is connected with the first input end of a first adder, the second input end of the first adder inputs the reactive reference value of the static reactive compensator, the output end of the first adder is connected with the input end of a second gain circuit, the output end of the second gain circuit is connected with the output circuit, and the output circuit inputs the output admittance value of the first controller.
Preferably, the voltage regulating circuit includes a second adder, a third gain circuit, and a fourth gain circuit; wherein the first input end of the second adder outputsV into the output of the comparison circuitmax/VminA second input end of the second adder is connected with an output end of the third gain circuit, an output end of the second adder is connected with an input end of the fourth gain circuit, and an input end of the third gain circuit inputs a voltage value V of a grid-connected point of the static var compensatorNThe output end of the fourth gain circuit is connected with the output circuit, and a second controller output admittance value is input into the output circuit;
preferably, the output circuit comprises a fifth gain circuit and a thyristor susceptance controller; the input end of the fifth gain circuit is connected with the output end of the fourth gain circuit and the output end of the second gain circuit at the same time; the output end of the fifth gain circuit is connected with the input end of the thyristor susceptance controller, and the static reactive power compensator is controlled to operate in a main control-inductive branch constant reactive power control state according to the output admittance value of the first controller; or controlling the static var compensator to operate in an auxiliary control-constant voltage control state according to the output admittance value of the second controller.
The technical scheme has the following beneficial effects: the technical scheme stabilizes the system voltage after disturbance in V through flexible switching between the inductive branch constant reactive power control and the constant voltage control under certain conditionsmin,Vmax]In addition, the wind power plant economic operation requirement is met, normal fluctuation of system voltage is guaranteed, and the SVC fully exerts the reactive power dynamic regulation capability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of dynamic regulation characteristics under a conventional SVC constant current control mode;
fig. 2 is a graph comparing the effect of conventional SVC inductive branch constant reactive control on system voltage sensitivity;
FIG. 3 is a schematic view of the working principle of the present embodiment;
fig. 4 is a block diagram of a main and auxiliary cooperative control device for a static var compensator of a wind farm according to the present invention;
FIG. 5 is a block diagram of an implementation of the apparatus according to the present embodiment;
fig. 6 is a comparison graph of the effects of the SVC main and auxiliary cooperative control and the inductive branch constant reactive power control in this embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 3 is a schematic diagram of the working principle of the present technical solution. The working principle of the technical scheme is as follows: in the SVC main and auxiliary cooperative control strategy, the inductive branch constant reactive power control is still the main control mode, the SVC grid-connected point constant voltage control is added as the auxiliary control, and the main and auxiliary cooperative action is realized by mutually switching the two controls when a certain condition is met. Wherein, in FIG. 3, VNThe grid connection point voltage is SVC grid connection point voltage, and is generally a low-voltage side bus of a wind power plant; vminSwitching lower limit, V, for main and auxiliary controlmaxThe upper limit is switched for main and auxiliary control according to the concrete work of the wind power systemSetting conditions; b isLAnd outputting the admittance value for the controller. When V ismin<VN<VmaxThe SVC runs in the main control-the inductive branch constant reactive power control, and the link is completed through the action of a reactive power regulator; once V is satisfiedN<VminOr Vmax<VNThe SVC operates in auxiliary control-constant voltage control, and the link is completed by a voltage regulator.
As shown in fig. 4, for the utility model provides a main and auxiliary cooperative control device block diagram for wind farm static var compensator. The device includes:
an input circuit 401, a comparison circuit 402, a voltage regulation circuit 403, a reactive power regulation circuit 404 and an output circuit 405; wherein,
the input circuit 401 is used for inputting the voltage value V of the grid-connected point of the static var compensator to the comparison circuit 402 and the voltage regulation circuit 403NAnd inputs the inductive branch current of the static var compensator to the reactive power regulating circuit 404;
the comparison circuit 402 is used for comparing the voltage value V of the grid-connected point of the static var compensatorNMain and auxiliary control switching lower limit voltage value VminMain and auxiliary control switching upper limit voltage value Vmax(ii) a If Vmin<VN<VmaxIf the voltage value V is greater than the threshold value V, the switch is turned on, and the comparison circuit 402 outputs the voltage value V of the grid-connected point of the static var compensatorNTo the reactive power regulating circuit; if VN>VmaxThe switch is turned on, and the comparison circuit 402 outputs Vmax(ii) a If VN<VminThe switch is turned on, and the comparison circuit 402 outputs Vmin；
The reactive power adjusting circuit 403 is configured to adjust the voltage value V of the grid-connected point of the static reactive power compensator output by the comparing circuit 402NInputting a first controller output admittance value to the output circuit;
the voltage regulating circuit 404 is configured to input a second controller output admittance value to the output circuit 405 according to a output from the comparing circuit 402;
the output circuit 405 is configured to control the static var compensator to operate in the master control-inductive branch constant var control state according to the first controller output admittance value; or
And controlling the static var compensator to operate in an auxiliary control-constant voltage control state according to the output admittance value of the second controller.
Preferably, the input circuit 401 comprises a first measurer and a second measurer; the first measurer is used for measuring the voltage value of the low-voltage side of the wind power plant and measuring the voltage value V of the grid-connected point of the static reactive power compensatorNInput to the comparison circuit and the voltage regulation circuit; and the second measurer is used for measuring the inductive branch current of the static reactive compensator and inputting the measured value to the reactive power regulating circuit.
Preferably, the comparison circuit 402 comprises a switch and a comparator; wherein, the first input end of the comparator inputs the voltage value V of the grid-connected point of the static var compensatorNThe second input end of the comparator inputs a main and auxiliary control switching lower limit voltage value VminThe third input end of the comparator inputs a main and auxiliary control switching upper limit voltage value VmaxSaid comparator comparing VN、Vmin、VmaxIf V ismin<VN<VmaxIf the static var compensator is in the off state, the switch is switched on, and the comparison circuit outputs the voltage value V of the grid-connected point of the static var compensatorNTo the reactive power regulating circuit; if VN>VmaxThe switch is turned on, and the comparison circuit outputs Vmax(ii) a If VN<VminThe switch is turned on, and the comparison circuit outputs Vmin。
Preferably, the reactive power adjusting circuit 403 includes a first gain circuit, a multiplier, a first adder, and a second gain circuit; wherein the input end of the first gain circuit inputs the measured value of the second measurer(ii) a The output end of the first gain circuit is connected with the first input end of the multiplier, and the second input end of the multiplier inputs the voltage value V of the grid-connected point of the static var compensator output by the comparison circuitNThe output end of the multiplier is connected with the first input end of a first adder, the second input end of the first adder inputs the reactive reference value of the static reactive compensator, the output end of the first adder is connected with the input end of a second gain circuit, the output end of the second gain circuit is connected with the output circuit, and the output circuit inputs the output admittance value of the first controller.
Preferably, the voltage regulating circuit 404 includes a second adder, a third gain circuit, and a fourth gain circuit; the first input end of the second adder is input with V output by the comparison circuitmin/VmaxA second input end of the second adder is connected with an output end of the third gain circuit, an output end of the second adder is connected with an input end of the fourth gain circuit, and an input end of the third gain circuit inputs a voltage value V of a grid-connected point of the static var compensatorNThe output end of the fourth gain circuit is connected with the output circuit, and a second controller output admittance value is input into the output circuit;
preferably, the output circuit 405 includes a fifth gain circuit and a thyristor susceptance controller; the input end of the fifth gain circuit is connected with the output end of the fourth gain circuit and the output end of the second gain circuit at the same time; the output end of the fifth gain circuit is connected with the input end of the thyristor susceptance controller, and the static reactive power compensator is controlled to operate in a main control-inductive branch constant reactive power control state according to the output admittance value of the first controller; or controlling the static var compensator to operate in an auxiliary control-constant voltage control state according to the output admittance value of the second controller.
As shown in fig. 5, it is a block diagram of the apparatus of this embodiment. In fig. 5, the device is composed of a reactive power adjusting circuit, a voltage adjusting circuit, a switching circuit, an input circuit, and an output circuit. Wherein the input circuit comprises a first measurer and a second measurer; the comparison circuit comprises a selector switch and a comparator; the reactive power regulating circuit comprises a first gain circuit, a multiplier, a first adder and a second gain circuit; the voltage regulating circuit comprises a second adder, a third gain circuit and a fourth gain circuit; the output circuit comprises a fifth gain circuit and a thyristor susceptance controller. Wherein,
the first measurer is used for measuring the voltage value of the low-voltage side of the wind power plant and measuring the voltage value V of the grid-connected point of the static reactive compensatorNInput to the comparator and the third gain circuit; the second measurer is used for measuring the inductive branch current of the static var compensator and inputting the measured value to the first gain circuit.
The first input end of the comparator inputs the voltage value V of the grid-connected point of the static var compensatorNThe second input end of the comparator inputs a main and auxiliary control switching lower limit voltage value VminThe third input end of the comparator inputs a main and auxiliary control switching upper limit voltage value VmaxComparator comparison VN、Vmin、VmaxIf V ismin<VN<VmaxIf the switch is turned on, the comparison circuit outputs the voltage value V of the grid-connected point of the static var compensatorNTo the reactive power regulating circuit; if VN>VmaxThe switch is turned on, and the comparison circuit outputs Vmax(ii) a If VN<VminThe switch is turned on, and the comparison circuit outputs Vmin。
When V ismin<VN<VmaxIf the switch is turned on, the comparison circuit outputs the voltage value V of the grid-connected point of the static var compensatorNThe input end of the first gain circuit of the reactive power regulating circuit inputs the current value measured by the second measurer; output terminal of the first gain circuit is ILWherein, ILThe current value of the inductive branch is measured by the second measurer after the phase lead-lag change,denotes the change in phase, ILThe voltage value is input to a first input end of a multiplier, and a second input end of the multiplier is input to a voltage value V of a grid-connected point of a static var compensator output by a comparison circuitNThe output end of the multiplier outputs QL，QLRepresenting reactive power of the inductive branch, QLIs equal to ILMultiplied by VN，QLThe first input end of the first adder is input, and the second input end of the first adder is input with the reactive reference value Q of the static reactive compensatorLrefThe output end of the first adder outputs delta QL，ΔQLShould be equal to QL-QLref，ΔQLThe output end of the second gain circuit outputs a first controller output admittance value BL1，BL1Representing inductive branch susceptance, Δ QLIs changed into B through proportional integralL1The proportional integral isThat is, the output terminal of the second gain circuit is connected to the output circuit, and the first controller output admittance value B is input to the output circuitL1。
When V isN<VminThe switch is turned on, and the comparison circuit outputs VminWhen V ismax<VNThe switch is turned on, and the comparison circuit outputs Vmax(ii) a The input end of the third gain circuit inputs the voltage value V of the grid-connected point of the static var compensatorNThe output of the third gain circuit is W, W is VNObtained by variation of the phase, only the difference in phase, with VNWithout numerical difference, the first input terminal of the second adder inputs V output by the comparison circuitmin/VmaxIn FIG. 5, Vref＝Vmin/VmaxA second input terminal of the second adder is connected to an output terminal of the third gain circuit, and an output terminal of the second adder outputs Δ V, Δ V being W-VrefΔ V is input to an input terminal of the fourth gain circuit, and an output terminal of the fourth gain circuit outputs a second controller output admittance value BL2，BL2Is inductive branch susceptance, and DeltaV is converted into B through proportional integralL2Proportional integral ofThat is, the output terminal of the fourth gain circuit is connected to the output circuit, and the second controller output admittance value B is input to the output circuitL2；
The input end of the fifth gain circuit is simultaneously connected with the output end of the fourth gain circuit and the output end of the second gain circuit; the output end of the fifth gain circuit is connected with the input end of the thyristor susceptance controller, and the admittance value B is output according to the first controllerL1Controlling the static reactive compensator to operate in a main control-inductive branch constant reactive power control state; or according to said second controller outputting admittance value BL2And controlling the static var compensator to operate in an auxiliary control-constant voltage control state.
In the embodiment, according to the relevant provisions for wind power connection to the power grid, V is generally setmax、VminThe normal pressure regulating requirements of the system can be met by setting 0.97pu and 1.05 pu; wherein the voltage regulating circuit and the reactive power regulating circuit both adopt a proportional-integral control (PI control) principle; the input circuit and the output circuit both adopt a first-order lead-lag link. And introducing the finally obtained inductive branch susceptance value into the thyristor susceptance controller.
Fig. 6 is a graph comparing the effect of the SVC main and auxiliary cooperative control and the inductive branch constant reactive power control in this embodiment. In fig. 6, the inductive branch constant reactive power control currently and commonly used in the SVC does cause the system voltage to fluctuate greatly after disturbance, in contrast, the system voltage can meet the requirement after the SVC adopts the main and auxiliary cooperative control strategy.
Further, the flexible switching between the inductive branch constant reactive power control and the constant voltage control is realized under certain conditionsStabilizing the system voltage after disturbance at [ V ]min,Vmax]In addition, the wind power plant economic operation requirement is met, normal fluctuation of system voltage is guaranteed, and the SVC fully exerts the reactive power dynamic regulation capability.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A main and auxiliary cooperative control device for a static var compensator of a wind power plant is characterized by comprising:
the device comprises an input circuit, a comparison circuit, a voltage regulation circuit, a reactive power regulation circuit and an output circuit; wherein,
the input circuit is used for inputting the voltage value V of the grid-connected point of the static var compensator to the comparison circuit and the voltage regulation circuitNInputting inductive branch current of the static reactive compensator to the reactive power regulating circuit;
the comparison circuit is used for comparing the staticVoltage value V of grid-connected point of reactive compensatorNMain and auxiliary control switching lower limit voltage value VminMain and auxiliary control switching upper limit voltage value Vmax(ii) a If Vmin<VN<VmaxIf the static var compensator is in the off state, the switch is switched on, and the comparison circuit outputs the voltage value V of the grid-connected point of the static var compensatorNTo the reactive power regulating circuit; if VN>VmaxThe switch is turned on, and the comparison circuit outputs Vmax(ii) a If VN<VminThe switch is turned on, and the comparison circuit outputs Vmin；
The reactive power regulating circuit is used for regulating the voltage value V of the grid-connected point of the static reactive power compensator according to the voltage value V output by the comparison circuitNInputting a first controller output admittance value to the output circuit;
the voltage regulating circuit is used for regulating the voltage according to the V output by the comparison circuitmax/VminInputting a second controller output admittance value to the output circuit;
the output circuit is used for controlling the static reactive power compensator to operate in a main control-inductive branch constant reactive power control state according to the output admittance value of the first controller; or
And controlling the static var compensator to operate in an auxiliary control-constant voltage control state according to the output admittance value of the second controller.
2. The apparatus of claim 1, wherein the input circuit comprises a first measurer and a second measurer; the first measurer is used for measuring the voltage value of the low-voltage side of the wind power plant and measuring the voltage value V of the grid-connected point of the static reactive power compensatorNInput to the comparison circuit and the voltage regulation circuit; and the second measurer is used for measuring the inductive branch current of the static reactive compensator and inputting the measured value to the reactive power regulating circuit.
3. The apparatus of claim 2, wherein the comparison circuit comprises a toggle switch and a comparator; wherein, theThe first input end of the comparator inputs the voltage value V of the grid-connected point of the static var compensatorNThe second input end of the comparator inputs a main and auxiliary control switching lower limit voltage value VminThe third input end of the comparator inputs a main and auxiliary control switching upper limit voltage value VmaxSaid comparator comparing VN、Vmin、VmaxIf V ismin<VN<VmaxIf the static var compensator is in the off state, the switch is switched on, and the comparison circuit outputs the voltage value V of the grid-connected point of the static var compensatorNTo the reactive power regulating circuit; if VN>VmaxThe switch is turned on, and the comparison circuit outputs Vmax(ii) a If VN<VminThe switch is turned on, and the comparison circuit outputs Vmin。
4. The apparatus of claim 3, wherein the reactive power regulation circuit comprises a first gain circuit, a multiplier, a first summer, and a second gain circuit; the input end of the first gain circuit inputs the measured value of a second measurer; the output end of the first gain circuit is connected with the first input end of the multiplier, and the second input end of the multiplier inputs the voltage value V of the grid-connected point of the static var compensator output by the comparison circuitNThe output end of the multiplier is connected with the first input end of a first adder, the second input end of the first adder inputs the reactive reference value of the static reactive compensator, the output end of the first adder is connected with the input end of a second gain circuit, the output end of the second gain circuit is connected with the output circuit, and the output circuit inputs the output admittance value of the first controller.
5. The apparatus of claim 4, the voltage regulation circuit comprising a second adder, a third gain circuit, and a fourth gain circuit; the first input end of the second adder is input with V output by the comparison circuitmax/VminSecond output of said second adderThe input end of the second adder is connected with the input end of the fourth gain circuit, and the input end of the third gain circuit inputs the voltage value V of the grid-connected point of the static var compensatorNAnd the output end of the fourth gain circuit is connected with the output circuit, and a second controller output admittance value is input into the output circuit.
6. The apparatus of claim 5, wherein the output circuit comprises a fifth gain circuit and a thyristor susceptance controller; the input end of the fifth gain circuit is connected with the output end of the fourth gain circuit and the output end of the second gain circuit at the same time; the output end of the fifth gain circuit is connected with the input end of the thyristor susceptance controller, and the static reactive power compensator is controlled to operate in a main control-inductive branch constant reactive power control state according to the output admittance value of the first controller; or controlling the static var compensator to operate in an auxiliary control-constant voltage control state according to the output admittance value of the second controller.
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| CN201420492118.6U CN204118744U (en) | 2014-08-28 | 2014-08-28 | For the major-minor Collaborative Control device of wind energy turbine set Static Var Compensator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449685A (en) * | 2014-08-28 | 2016-03-30 | 国家电网公司 | Main and auxiliary cooperative control device and main and auxiliary cooperative control method for wind power plant static reactive power compensator |
| CN106532726A (en) * | 2016-11-23 | 2017-03-22 | 国家电网公司 | Reactive voltage regulating control method of double-feed converter virtual synchronous machine |
-
2014
- 2014-08-28 CN CN201420492118.6U patent/CN204118744U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449685A (en) * | 2014-08-28 | 2016-03-30 | 国家电网公司 | Main and auxiliary cooperative control device and main and auxiliary cooperative control method for wind power plant static reactive power compensator |
| CN105449685B (en) * | 2014-08-28 | 2018-05-08 | 国家电网公司 | For the major-minor Collaborative Control device and method of wind power plant Static Var Compensator |
| CN106532726A (en) * | 2016-11-23 | 2017-03-22 | 国家电网公司 | Reactive voltage regulating control method of double-feed converter virtual synchronous machine |
| CN106532726B (en) * | 2016-11-23 | 2019-02-01 | 国家电网公司 | A kind of idle Regulation Control method of double-feed current transformer virtual synchronous machine |
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