CN105449685B - For the major-minor Collaborative Control device and method of wind power plant Static Var Compensator - Google Patents
For the major-minor Collaborative Control device and method of wind power plant Static Var Compensator Download PDFInfo
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- CN105449685B CN105449685B CN201410432820.8A CN201410432820A CN105449685B CN 105449685 B CN105449685 B CN 105449685B CN 201410432820 A CN201410432820 A CN 201410432820A CN 105449685 B CN105449685 B CN 105449685B
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Abstract
The present invention relates to a kind of major-minor Collaborative Control device and method for wind power plant Static Var Compensator, including：Input circuit inputs V to comparison circuit and voltage regulator circuitN, to Reactive-power control circuit input Static Var Compensator perception branch current；Comparison circuit compares VN, major-minor control switching upper and lower limit magnitude of voltage VminAnd Vmax；If Vmin<VN<Vmax, switching switch conducting, comparison circuit output VN；Otherwise, switching switch turns on, comparison circuit output A；The V that Reactive-power control circuit is exported according to comparison circuitNThe first controller output admittance value B is inputted to output circuitL1；Voltage regulator circuit inputs second controller output admittance value B according to the value that comparison circuit exports to output circuitL2；Output circuit is according to BL1Control SVC runs on the permanent idle state of a control of main control perception branch；Or according to BL2Control SVC runs on auxiliary control constant voltage state of a control.
Description
Technical Field
The invention relates to the field of static var compensators, in particular to a main and auxiliary cooperative control device and method for a static var compensator of a wind power plant.
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.
The other SVC control strategy takes SVC inductive branch reactive power constant as a final control target, and the capacitive branch of the SVCThe control method can reduce the circulation loss generated in the SVC under the normal operation condition and meet the requirement of the economic operation of the 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.
Disclosure of Invention
In order to solve the technical problems, the invention provides a main and auxiliary cooperative control device and method for a static var compensator of a wind power plant, which can effectively avoid the large fluctuation of system voltage after small disturbance and stabilize the system voltage in a required range while meeting the economic operation requirement of the wind power plant.
In order to achieve the above object, the present invention provides a main and auxiliary cooperative control apparatus for a static var compensator of a wind farm, 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 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; otherwise, the switch is turned on, and the comparison circuit outputs a signal VN>VmaxOtherwise, the switch is turned on, and the comparison circuit outputs VmaxA; 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 compensatorNIs inputted to the instituteThe 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 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 is input with V output by 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.
Preferably, the gain values of the first gain circuit, the second gain circuit and the fifth gain circuit are allWherein, T1Representing the lead time constant, T2Representing the lag time constant.
Preferably, the gain values of the second gain circuit and the fourth gain circuit are bothWherein, KpIs the proportional gain, KiThe gain is integrated.
In order to achieve the purpose, the invention also provides a main and auxiliary cooperative control method for the wind power plant static var compensator, which is characterized in that the method is realized based on an input circuit, a comparison circuit, a voltage regulating circuit, a reactive power regulating circuit and an output circuit; the method comprises the following steps:
the input circuit inputs 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 compares 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 outputs a voltage value V of a grid connection point of the static reactive power compensator according to 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 controls 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 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 economic operation requirement of the wind power plant is met, and meanwhile, the wind power plant is protectedThe normal fluctuation of the system voltage is proved, 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 the 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 flowchart of a main and auxiliary cooperative control method for a static var compensator of a wind farm according to the present invention;
FIG. 6 is a block diagram of an implementation of the apparatus according to the present embodiment;
fig. 7 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 clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 of the main control and the auxiliary control needs to be set according to the specific working condition of the wind power system; 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, a block diagram of a main and auxiliary cooperative control device for a static var compensator of a wind farm is provided for the present invention. 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 main and auxiliary control switchingUpper 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; 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 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.
Preferably, the gain values of the first gain circuit, the second gain circuit and the fifth gain circuit are allWherein, T1Representing the lead time constant, T2Representing the lag time constant.
Preferably, the gain values of the second gain circuit and the fourth gain circuit are bothWherein, KpIs the proportional gain, KiThe gain is integrated.
As shown in fig. 5, a flowchart of a main and auxiliary cooperative control method for a static var compensator of a wind farm provided by the present invention is shown. The method is realized based on an input circuit, a comparison circuit, a voltage regulation circuit, a reactive power regulation circuit and an output circuit; the method comprises the following steps:
step 501): the input circuit inputs 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;
step 502): the comparison circuit compares 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 switchLimit 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；
Step 503): the reactive power regulating circuit outputs a voltage value V of a grid connection point of the static reactive power compensator according to the comparison circuitNInputting a first controller output admittance value to the output circuit;
step 504): the voltage regulating circuit is used for regulating the voltage according to the V output by the comparison circuitmin/VmaxInputting a second controller output admittance value to the output circuit;
step 505): the output circuit controls 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 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. 6, it is a block diagram of the apparatus of this embodiment. In fig. 6, 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 testThe 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 outputsΔQL，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 fifth gainThe input end of the 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. 7 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. 7, 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 system voltage after disturbance is stabilized at V by flexibly switching 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.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
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 forComparing voltage value V of grid-connected point of 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 comparison circuit outputs the voltage value V of the grid-connected point of the static var compensator, 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
Controlling the static reactive power compensator to operate in an auxiliary control-constant voltage control state according to the output admittance value of the second controller;
the input circuit comprises a first measurer and a second measurer; the first measurer is used for measuring the voltage value of the grid-connected point of the static reactive power compensator at 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; 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;
the comparison circuit comprises a selector 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 VminThird input of the comparatorInput end input 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；
The reactive power regulating 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 first controller output admittance value;
the voltage regulating circuit comprises 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/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;
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 reactive power compensator to operate in an auxiliary control-constant voltage control state according to the output admittance value of the second controller;
the gain values of the first gain circuit, the second gain circuit and the fifth gain circuit are allWherein, T1Representing the lead time constant, T2Representing the lag time constant.
2. The apparatus of claim 1, wherein the gain values of the second gain circuit and the fourth gain circuit are eachWherein, KpIs the proportional gain, KiThe gain is integrated.
3. A main and auxiliary cooperative control method for a static var compensator of a wind power plant is characterized in that the method is realized based on an input circuit, a comparison circuit, a voltage regulation circuit, a reactive power regulation circuit and an output circuit; the method comprises the following steps:
the input circuit inputs 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 compares 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 comparison circuit outputs the voltage value V of the grid-connected point of the static var compensator, 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 outputs a voltage value V of a grid connection point of the static reactive power compensator according to 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 controls 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 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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| CN201910621U (en) * | 2011-01-14 | 2011-07-27 | 长春工业大学 | Closed loop multimode control system of harmonic suppression and reactive power compensation device |
| CN202798014U (en) * | 2012-08-21 | 2013-03-13 | 广东明阳风电产业集团有限公司 | Topological structure for wind power station grid connection control |
| CN204118744U (en) * | 2014-08-28 | 2015-01-21 | 国家电网公司 | For the major-minor Collaborative Control device of wind energy turbine set Static Var Compensator |
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| CN102118032B (en) * | 2011-03-29 | 2012-11-28 | 荣信电力电子股份有限公司 | SVC reactive prediction and compensation method for rectifier load |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201910621U (en) * | 2011-01-14 | 2011-07-27 | 长春工业大学 | Closed loop multimode control system of harmonic suppression and reactive power compensation device |
| CN202798014U (en) * | 2012-08-21 | 2013-03-13 | 广东明阳风电产业集团有限公司 | Topological structure for wind power station grid connection control |
| CN204118744U (en) * | 2014-08-28 | 2015-01-21 | 国家电网公司 | For the major-minor Collaborative Control device of wind energy turbine set Static Var Compensator |
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