CN110912147A - Static var generator-based power grid voltage adjusting method and device and readable storage medium - Google Patents
Static var generator-based power grid voltage adjusting method and device and readable storage medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a static var generator-based power grid voltage adjusting method, which comprises the following steps: s01, acquiring load reactive power QLVoltage value V of common connection point of buss(ii) a S02, calculating a preset voltage reference value VrefAnd VsThe difference e (t) therebetween; s03, carrying out nonlinear PI regulation on e (t) to obtain output Q of the voltage feedback closed-loop control linkvs(ii) a S04, mixing-QLObtaining the reactive output reference value Q of the static var generator as the output quantity of the load reactive feedforward open loop control linkrefSo that the SVG can output a reference value Q according to the reactive powerrefAnd reactive power is output to realize the regulation of the voltage of the power grid. The invention correspondingly discloses a power grid voltage adjusting device corresponding to the adjusting method. The invention also discloses a computer readable storage medium, on which a readable computer program is stored, which when executed by a processor implements the method as described above. Method and apparatus of the inventionThe medium has the advantages of high adjusting speed, high precision and the like.
Description
Technical Field
The invention mainly relates to the technical field of voltage regulation, in particular to a static var generator-based power grid voltage regulation method and device and a readable storage medium.
Background
In some industrial and mining enterprises with high energy consumption, high-power impact loads (such as rolling mills, electric arc furnaces and the like) are often installed; due to sudden change of impact load, sudden loading or sudden unloading of the load can cause severe fluctuation and flicker of the voltage of the power grid, and serious influence is caused on the power utilization safety. Therefore, the enterprises can install dynamic reactive power compensation devices with certain capacity, such as Static Var Generators (SVG) or Static Var Compensators (SVC), to compensate reactive power in the power grid, and the stability of the voltage of the power grid is improved.
Static var generator SVG, also called Static Synchronous Compensator (STATCOM for short), has more excellent performance in many aspects such as response speed, stabilizing power grid voltage, reducing system loss, increasing transmission capability, improving transient voltage limit, reducing harmonic and reducing floor area, and is widely applied to various industries at present. Therefore, research on a fast dynamic response technology based on Static Var Generators (SVG) to improve the stability of the voltage of the power grid and improve the electricity utilization safety has important significance for the industrial and mining enterprises with high-power impact loads.
At present, many researches are made on the application of utilizing a dynamic reactive power compensation device to adjust the voltage of a power grid; the utilized dynamic reactive power compensation devices mainly comprise SVG, SVC, magnetically controlled reactors and the like; the pressure regulation research is mainly focused on two aspects: firstly, the reactive power required to be compensated is calculated by directly detecting the change of the voltage of the power grid; and secondly, the reactive power required to be compensated is calculated by detecting the combination of the changes of the load reactive power and the bus reactive power, so that the voltage of the power grid is stabilized. In the first method, there are two implementation manners: one is that the voltage feedback value of the public connection point is compared with the given value, and the generated difference value forms a reactive current instruction value after passing through a PI regulator, and the reactive current instruction value is used as an SVG reactive input reference value; another is to obtain the short circuit impedance of the grid, calculate a gain value for the power supply grid using the determined short circuit impedance, and control the grid voltage level according to the calculated gain value by applying the gain value as a gain parameter in a voltage controller. In the second method, the load feedforward open-loop control is used for realizing the rapid compensation of the reactive power change of the load, the bus reactive power feedback closed-loop control is used for improving the compensation precision and dynamic characteristics, and the response speed of the voltage change caused by the reactive power of the load is improved in a mode of combining the two.
At present, the main patents and articles for the method for regulating the voltage of the power grid by using a dynamic reactive power compensation device are as follows:
(1) patent of Beijing Kongzi Jinzhiji electric technology Limited company' dynamic reactive voltage adjusting device for high-voltage line and adjusting method thereof
The invention relates to a dynamic reactive voltage regulating device for a high-voltage line and a regulating method thereof, wherein the device comprises N magnetic control reactor branches, a fixed capacitor branch, a lightning arrester branch, an outdoor high-voltage drop-out fuse, an outdoor high-voltage line current transformer and a controller, wherein each magnetic control reactor branch consists of a magnetic control reactor and is provided with the current transformer; after the nth magnetically controlled reactor branch is connected with the nth fixed capacitor branch and the nth lightning arrester branch in parallel, the nth magnetically controlled reactor branch is hung on an outdoor high-voltage bus through an nth outdoor high-voltage drop-out fuse; the outdoor high-voltage line current transformer is connected in series in an outdoor high-voltage bus loop; the current transformers of the branches of the magnetic control reactors and the outdoor high-voltage line current transformer are connected with the input end of the controller, and the output end of the controller is connected with the magnetic control reactors. The invention can realize dynamic compensation and smooth stepless regulation of reactive capacity, does not need switching, is safe and reliable, and has obvious line loss and energy saving. Although the calculation of the controller adopting an instantaneous reactive power control algorithm is faster than that of a traditional period effective value algorithm, the dynamic response speed of a magnetically controlled reactor branch and a fixed capacitor branch in the system is low and is more than hundred milliseconds.
(2) Patent "method for controlling grid voltage" of the group of vistas wind systems company
The invention relates to a method for controlling the voltage level of a power supply grid operatively connected to an electrical power source. The method comprises the following steps: determining a short circuit impedance of the power supply grid at a point of common coupling, calculating a gain value of the power supply grid using the determined short circuit impedance, and controlling the grid voltage level according to the calculated gain value by applying the gain value as a gain parameter in a voltage controller. The method according to the invention can be implemented as a method for configuring a voltage controller once and for all, or as a method for adaptively adjusting the gain of a voltage controller. The method needs to know the short-circuit impedance of the power grid and determine a corresponding gain value to adjust the voltage, although the adjustment is fast, the accuracy is poor, for the dynamic reactive power compensation device, different parameters need to be matched according to different projects, and the adaptability to a power supply system is poor.
(3) China south electric network Limited liability company STATCOM reactive generator based on constant voltage control strategy
The utility model discloses a STATCOM reactive generator based on a constant voltage control strategy, which comprises a plurality of H bridge power units with the same structure into a converter chain, wherein each converter chain is one phase, and each phase is connected in parallel on a power grid through a reactor; the voltage or current signal of the bus side is collected through the sampling unit, the fluctuation condition of the bus voltage is tracked in real time, and when the bus voltage exceeds a rated range, the control unit sends a control signal to the trigger unit to compensate the bus voltage, so that constant voltage control is realized. The STATCOM reactive generator adopts constant voltage control, and has the functions of high response speed, power grid voltage stabilization, transient voltage limit improvement, harmonic reduction and the like. Because the constant voltage control adopts a pure integral adjusting unit, although the control precision is higher, the dynamic response is slower.
(4) Document composite control method of static var compensator based on rapid equivalent susceptance calculation
An unbalance compensation method of a Static Var Compensator (SVC) is proposed. Aiming at the power compensation requirement under the unbalanced condition, an equivalent susceptance detection method based on a Buddy-buchholz-depend-delay (FBD) algorithm is provided, and the calculated amount of the system is effectively reduced; in order to improve the compensation performance of the SVC, an open-loop and closed-loop composite control method is provided, and a simplex algorithm is utilized to dynamically adjust control parameters, so that the robustness of the system is improved, the compensation precision and the compensation performance of the SVC are greatly improved, the power balance of a three-phase system is realized, the voltage of a power grid is stabilized, and the power quality of a power supply system is improved. However, this method requires the detection of load current, and is not suitable when there are multiple load branches in the power supply system. The reason is as follows: when the power supply system has N load branches, the SVC control system needs to detect the CTs of the N load branches, and the algorithm amount is huge at the moment; meanwhile, in an actual situation, when N is large, the SVC control system hardware resources do not have the capability of detecting all branch CTs, and the method is not suitable at this time. In addition, the method only stabilizes the voltage by realizing the negative sequence and reactive complete compensation on the bus, does not consider the voltage fluctuation caused by the impact active load change, and does not perform closed-loop regulation on the voltage.
From the above analysis, the main problems in the multiple methods for realizing the parallel operation of the SVG mainly include:
1. part of methods adopt direct detection of the voltage of the power grid and adjust the voltage in a mode of a PI (proportional integral) regulator or a pure integral regulator, and although the control precision of the methods is higher, the dynamic response speed is slower;
2. the method has the advantages that the voltage of the power grid is directly detected, the voltage is regulated in a nonlinear PI regulator mode, and although the dynamic response speed of the method is improved compared with that of a method which is suitable for a pure PI regulator, the problem of voltage fluctuation caused by nonlinear impact loads such as an electric arc furnace is still difficult to manage;
3. the method is used for controlling reactive feedback closed loop of a bus and cannot adjust voltage change caused by active power.
4. In part of methods, the voltage is regulated in a mode of switching a capacitor FC by adopting a magnetically controlled reactor, and the speed is low;
5. in part of methods, SVC is adopted to adjust voltage, the speed is slower than that of SVG, and a certain amount of harmonic current is generated by an SVC device to pollute a power grid.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a static var generator-based power grid voltage adjusting method, a static var generator-based power grid voltage adjusting device and a readable storage medium, wherein the adjusting speed is high, and the adjusting precision is high.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a power grid voltage regulation method based on a static var generator comprises a load reactive feedforward open-loop control link and a voltage feedback closed-loop control link, and specifically comprises the following steps:
s01, acquiring load reactive power QLVoltage value V of common connection point of buss；
S02, calculating a preset voltage reference value VrefAnd a voltage value VsThe difference between, i.e. the adjustment error e (t) Vref-Vs；
S03, carrying out nonlinear PI regulation on the regulation error e (t) to obtain an output instruction Q of the voltage feedback closed-loop control linkvs；
S04, mixing-QLObtaining the reactive output reference value Q of the static var generator as the output quantity of the load reactive feedforward open loop control linkref＝-QL+Qvs＝QSVG-Qs+QvsSo that the SVG can output a reference value Q according to the reactive powerrefAnd reactive power is output to realize the regulation of the voltage of the power grid.
Preferably, in step S01, a bus point reactive power value Q is calculatedsThe current output reactive power value Q of the static var generatorSVGTo obtain the load reactive power QL＝Qs-QSVG。
Preferably, the voltage signal, the current signal and the current signal I of the static var generator are detected through detecting the common connection point of the busSVGThereby calculating a voltage value VsValue Q of reactive powersAnd the current output reactive power value Q of the static reactive generatorSVG。
Preferably, in step S03, the non-linear PI adjustment is performed according to the non-linear function KP[e(t)]＝aP+bP{1-sech[cPe(t)]Calculating a proportional gain KP(ii) a Wherein a isP、bP、cPAre all positive real constants.
Preferably, in step S03, the non-linear PI adjustment is performed according to the non-linear function Ki[e(t)]＝aisech[cie(t)]Calculating an integral coefficient KiWherein a isi、ciAre all positive real constants.
Preferably, in step S04, the method will includeReference value Q of reactive outputrefAfter the reactive power/current conversion link, a reactive current reference value I is outputrefTo the static var generator.
Preferably, the reactive current is referenced to the value IrefAnd sending the current to a current inner ring control link, and outputting corresponding reactive current to the static var generator.
The invention correspondingly discloses a static var generator-based power grid voltage regulating device, which comprises
First module for acquiring load reactive power QLVoltage value V of common connection point of buss；
A second module for calculating a preset voltage reference value VrefAnd a voltage value VsThe difference between, i.e. the adjustment error e (t) Vref-Vs；
A third module for carrying out nonlinear PI regulation on the regulation error e (t) to obtain an output instruction Q of the voltage feedback closed-loop control linkvs；
Fourth module for converting-QLObtaining the reactive output reference value Q of the static var generator as the output quantity of the load reactive feedforward open loop control linkref＝-QL+Qvs＝QSVG-Qs+QvsSo that the SVG can output a reference value Q according to the reactive powerrefAnd reactive power is output to realize the regulation of the voltage of the power grid.
The invention also discloses a computer readable storage medium, on which a readable computer program is stored, characterized in that the readable computer program, when executed by a processor, implements the static var generator-based grid voltage regulation method as described above.
Compared with the prior art, the invention has the advantages that:
according to the grid voltage regulation method based on the static var generator, the load reactive feedforward open-loop control link and the voltage feedback closed-loop control link are combined, the precision is higher than that of a load feedforward open-loop voltage regulation mode which is only adopted, and the regulation speed is higher than that of a voltage feedback closed-loop voltage regulation mode which is only adopted; because the voltage change of the power grid can be caused by the reactive or active change of the load in the power supply system, the voltage fluctuation caused by the reactive change of the load in the power supply system is rapidly adjusted by the method of the reactive feedforward open-loop control of the load; voltage fluctuation caused by active change of a load in a power supply system is rapidly adjusted through voltage feedback closed-loop control; the nonlinear PI regulator is adopted, the gain is small when the regulation error is small, the gain is large when the regulation error is large, the characteristic of quick dynamic response is realized, and the method is particularly suitable for a system with quick load change; the method can match the control parameters well without knowing the impedance characteristic of the power supply system, and has good universality.
According to the grid voltage regulation method based on the static var generator, the reactive power of the load is indirectly deduced by detecting the reactive power of a PCC point (bus public connection point) and the reactive power output by the SVG without directly detecting and calculating the CT of the load branch circuit in the reactive power detection of the load, so that the method can be suitable for a power supply system with a plurality of load branch circuits which are rapidly changed.
The static var generator-based grid voltage regulating device and the computer-readable storage medium have the advantages of the method.
Drawings
FIG. 1 is a block diagram of the voltage regulation control of the present invention.
FIG. 2(a) shows K in the present inventionPThe graph is varied.
FIG. 2(b) shows K in the present inventioniThe graph is varied.
FIG. 3 is a wiring diagram of the SVG in the present invention in a specific application.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1 to 3, the grid voltage regulation method based on the static var generator of this embodiment is applicable to a power supply system with nonlinear impact loads such as an arc furnace, and includes a load reactive feedforward open-loop control link and a voltage feedback closed-loop control link, and the specific method steps are as follows:
s01, acquiring all negativesTotal load reactive power Q of load branchLVoltage value V of common connection point of buss；
S02, calculating a preset voltage reference value VrefAnd a voltage value VsThe difference between, i.e. the adjustment error e (t) Vref-Vs；
S03, carrying out nonlinear PI regulation on the regulation error e (t) to obtain an output instruction Q of the voltage feedback closed-loop control linkvs；
S04, mixing-QLObtaining a Static Var Generator (SVG) reactive output reference value Q as the output quantity of a load reactive feedforward open loop control linkref＝-QL+Qvs＝QSVG-Qs+QvsSo that the SVG can output a reference value Q according to the reactive powerrefAnd reactive power is output to realize the regulation of the voltage of the power grid.
According to the grid voltage regulation method based on the static var generator, the load reactive feedforward open-loop control link and the voltage feedback closed-loop control link are combined, the precision is higher than that of a load reactive feedforward open-loop control mode which is only adopted, and the regulation speed is higher than that of a voltage feedback closed-loop control mode which is only adopted; because the change of the voltage of the power grid is caused by the reactive or active change of the load in the power supply system, the voltage fluctuation caused by the reactive change of the load in the power supply system can be quickly adjusted by the method of the load reactive feedforward open-loop control; voltage fluctuation caused by active change of a load in a power supply system is rapidly adjusted through voltage feedback closed-loop control; the nonlinear PI regulator is adopted, the gain is small when the regulation error is small, the gain is large when the regulation error is large, the characteristic of quick dynamic response is realized, and the method is particularly suitable for a system with quick load change; the method can match the control parameters well without knowing the impedance characteristic of the power supply system, and has good universality.
In the embodiment, the voltage signal and the current signal of the bus common connection point (PCC point) and the current signal I of the static var generator are detectedSVGThereby calculating a voltage value VsValue Q of reactive powersAnd the current output reactive power value Q of the static reactive generatorSVGTo obtain the load reactive power QL＝Qs-QSVGThe output quantity of the load reactive feedforward open loop control link is-QL＝-(Qs-QSVG). Since the reactive power of the load is detected without direct detection and calculation through the CT of the load branch, but the reactive power of the load is indirectly derived by detecting the reactive power of the PCC point (bus common connection point) and the reactive power output by the SVG, the method can be applied to a power supply system with a plurality of load branches with rapid change, as shown in fig. 3.
In this embodiment, when the load is changed drastically, the reference voltage value V is set at that timerefAnd the voltage value V of the power gridsThe difference value of (a) is large, namely the adjustment error e (t), and the output proportional gain of the PI regulator is required to be large at the moment so as to realize quick dynamic response; with the progress of the regulation, a voltage reference value V is presetrefAnd the voltage value V of the power gridsThe difference e (t) of (a) becomes smaller step by step, and the regulator proportional gain is reduced in order to reduce the overshoot. Therefore, a function based on a hyperbolic secant function can be constructed as the proportional gain K of the nonlinear PI regulatorPAs follows:
KP[e(t)]＝aP+bP{1-sech[cPe(t)]}
in the formula, aP、bP、cPIs a positive real constant. When the error e (t) ± ∞PTaking the maximum value as aP+bP(ii) a When e (t) is 0, KPTaking the minimum value as aP；bPIs KPIn the variation interval of (c), adjustingPCan adjust the size of KPRate of change (sech is hyperbolic secant function), KP[e(t)]The function curve is shown in fig. 2 (a).
Integral gain parameter KiThe main effect of the integral control is to eliminate the steady-state error of the system. When the reference voltage V is presetrefAnd the voltage value V of the power gridsWhen the difference e (t) is larger, the expected integral gain is not too large, so that oscillation generated in response can be prevented, and overshoot can be reduced; when e (t) is smaller, it is desirable to increase the integral gain, which is advantageous to eliminate the steady-state error of the system. According to integral gain expectationVariation characteristic, integral gain parameter KiThe variation shape of (b) is shown in fig. 2(b), so that a function based on a hyperbolic secant function can be constructed as the integral coefficient K of the nonlinear PI regulatoriAs follows:
Ki[e(t)]＝aisech[cie(t)]
in the formula, ai、ciIs a positive real constant, KiHas a value range of (0, a)i) When e (t) is 0, KiTaking the maximum value. Wherein c isiDetermine KiHow fast or slow the change is.
In the present embodiment, in step S04, the reactive power output reference value Q is setrefAfter the reactive power/current conversion link, a reactive current reference value I is outputrefIs sent to the current inner loop control link and the current signal ISVGAnd after comparison, inputting the voltage into the SVG to output corresponding reactive current, and finishing the regulation of the power grid voltage.
The invention also discloses a static var generator-based power grid voltage regulating device, which comprises
First module for acquiring load reactive power QLVoltage value V of common connection point of buss；
A second module for calculating a preset voltage reference value VrefAnd a voltage value VsThe difference between, i.e. the adjustment error e (t) Vref-Vs；
A third module for carrying out nonlinear PI regulation on the regulation error e (t) to obtain an output instruction Q of the voltage feedback closed-loop control linkvs；
Fourth module for converting-QLObtaining the reactive output reference value Q of the static var generator as the output quantity of the load reactive feedforward open loop control linkref＝-QL+Qvs＝QSVG-Qs+QvsSo that the SVG can output a reference value Q according to the reactive powerrefAnd reactive power is output to realize the regulation of the voltage of the power grid.
The invention also discloses a computer-readable storage medium, on which a readable computer program is stored, which, when being executed by a processor, implements the method for regulating a grid voltage based on a static var generator as described above.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (9)
1. A power grid voltage regulation method based on a static var generator is characterized by comprising a load reactive power feedforward open-loop control link and a voltage feedback closed-loop control link, and specifically comprises the following steps:
s01, acquiring load reactive power QLVoltage value V of common connection point of buss；
S02, calculating a preset voltage reference value VrefAnd a voltage value VsThe difference between, i.e. the adjustment error e (t) Vref-Vs；
S03, carrying out nonlinear PI regulation on the regulation error e (t) to obtain an output instruction Q of the voltage feedback closed-loop control linkvs；
S04, mixing-QLObtaining the reactive output reference value Q of the static var generator as the output quantity of the load reactive feedforward open loop control linkref＝-QL+Qvs＝QSVG-Qs+QvsSo that the SVG can output a reference value Q according to the reactive powerrefAnd reactive power is output to realize the regulation of the voltage of the power grid.
2. The SVG-based grid voltage regulation method according to claim 1, characterized in that in step S01, a bus point reactive power value Q is calculatedsThe current output reactive power value Q of the static var generatorSVGTo obtain the load reactive power QL＝Qs-QSVG。
3. Method for regulating the voltage of a Static Var Generator (SVG) -based power grid according to claim 2, characterized in that the voltage signal, the current signal of the bus point of common connection and the current signal I of the SVG are detectedSVGThereby calculating a voltage value VsValue Q of reactive powersAnd the current output reactive power value Q of the static reactive generatorSVG。
4. The SVG-based grid voltage regulation method according to claim 1, 2 or 3, characterized in that in step S03, when performing the non-linear PI regulation, according to the non-linear function KP[e(t)]＝aP+bP{1-sech[cPe(t)]Calculating a proportional gain KP(ii) a Wherein a isP、bP、cPAre all positive real constants.
5. The SVG-based grid voltage regulation method according to claim 1, 2 or 3, characterized in that in step S03, when performing the non-linear PI regulation, according to the non-linear function Ki[e(t)]＝aisech[cie(t)]Calculating an integral coefficient KiWherein a isi、ciAre all positive real constants.
6. Method for regulating network voltage based on static var generator according to claim 1, 2 or 3, characterized in that in step S04 the reactive output reference Q is setrefAfter the reactive power/current conversion link, a reactive current reference value I is outputrefTo the static var generator.
7. Method for regulating the voltage of a Static Var Generator (SVG) -based grid according to claim 6, characterized in that the reactive current reference I is setrefAnd sending the current to a current inner ring control link, and outputting corresponding reactive current to the static var generator.
8. A static var generator-based power grid voltage regulation device is characterized by comprising
First module for acquiring load reactive power QLVoltage value V of common connection point of buss；
A second module for calculating a preset voltage reference value VrefAnd a voltage value VsThe difference between, i.e. the adjustment error e (t) Vref-Vs；
A third module for carrying out nonlinear PI regulation on the regulation error e (t) to obtain an output instruction Q of the voltage feedback closed-loop control linkvs；
Fourth module for converting-QLObtaining the reactive output reference value Q of the static var generator as the output quantity of the load reactive feedforward open loop control linkref＝-QL+Qvs＝QSVG-Qs+QvsSo that the SVG can output a reference value Q according to the reactive powerrefAnd reactive power is output to realize the regulation of the voltage of the power grid.
9. A computer-readable storage medium, on which a readable computer program is stored, which, when being executed by a processor, implements the method for regulating a grid voltage based on a static var generator according to any one of claims 1 to 7.
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