CN108964073B - Phase modulator-based multi-target reactive voltage coordination control method and system - Google Patents

Phase modulator-based multi-target reactive voltage coordination control method and system Download PDF

Info

Publication number
CN108964073B
CN108964073B CN201810564131.0A CN201810564131A CN108964073B CN 108964073 B CN108964073 B CN 108964073B CN 201810564131 A CN201810564131 A CN 201810564131A CN 108964073 B CN108964073 B CN 108964073B
Authority
CN
China
Prior art keywords
voltage
phase modulator
low
reactive
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810564131.0A
Other languages
Chinese (zh)
Other versions
CN108964073A (en
Inventor
申旭辉
邵德军
马世英
徐友平
李锴
唐晓骏
谢岩
党杰
潘晓杰
张三洪
罗红梅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Electric Power Research Institute Co Ltd CEPRI
Central China Grid Co Ltd
Original Assignee
China Electric Power Research Institute Co Ltd CEPRI
Central China Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Electric Power Research Institute Co Ltd CEPRI, Central China Grid Co Ltd filed Critical China Electric Power Research Institute Co Ltd CEPRI
Priority to CN201810564131.0A priority Critical patent/CN108964073B/en
Publication of CN108964073A publication Critical patent/CN108964073A/en
Application granted granted Critical
Publication of CN108964073B publication Critical patent/CN108964073B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention relates to a phase modulator-based multi-target reactive voltage coordination control method and a system, comprising the following steps: building a model of load flow data and stable data of a phase modulator accessed to an alternating current power grid; the method comprises the steps that an alternating current-direct current system is adopted to check the stability of main network voltage in a phase modulator near area; when the voltage instability of a main network in a phase modulator near area is determined, the voltage of a high-voltage bus is restored by the aid of the sub-transient state and the transient state of a phase modulator body autonomous response controller voltage; judging whether the phase modifier near area has low voltage suspension or not, and acquiring a judgment result; when the judgment result indicates that the phase modulator near area has low-voltage suspension, calculating the short-circuit current of a main network of the phase modulator near area, and determining the voltage control reactive power demand capacity of the power grid; the system voltage is quickly recovered by adopting reactive power control measures of increasing the reactive power output of the phase modulator and switching the low-voltage capacitive reactor in a near area in turns; and adjusting the reactive power distribution of the power grid in the vicinity of the phase modulator by using an automatic voltage control AVC system, and recovering the dynamic reactive power regulation capability of the phase modulator.

Description

Phase modulator-based multi-target reactive voltage coordination control method and system
Technical Field
The invention relates to the technical field of power systems, in particular to a phase modulator-based multi-target reactive voltage coordination control method and system.
Background
In an electric power system, a synchronous generator is the most common rotating equipment, which can generate reactive power while generating active power, and is the most excellent performance reactive power source. The phase modulator is a synchronous generator in a special operation state, and keeps good reactive compensation performance of the synchronous generator without generating active power.
The phase modulator has the performance advantages that reactive compensation and voltage support can be provided in the transient state, the transition process and the steady state full-time scale. In the aspect of transient state, at the moment that a voltage drop is caused by a power grid fault, the phase modulator utilizes the strong reactive output capacity of the phase modulator to quickly release a large amount of reactive power and reduce the amplitude and the speed of the voltage drop of the power grid, and the characteristic generally plays a role in the range of several to dozens of milliseconds. In the transient aspect, during fault recovery, the power grid voltage is still low, and the phase modulator excitation system can be excited forcibly, so that reactive support which exceeds the rated capacity of the phase modulator by 1.5 times or even more can be provided within a period of several seconds to tens of seconds, and the power grid voltage recovery is further assisted. In the aspect of the transition process, in the areas where the reactive power reserve of the power grid is insufficient and the voltage stability problem is outstanding, the problems of difficult voltage recovery after large disturbance exist, the characteristics of large capacity, high response speed and the like of a phase modulator can be fully utilized, the reactive power is quickly output through the phase modulator, the voltage recovery speed of the power grid in the transition process after disturbance is accelerated, and the voltage stability level of the power grid is improved. In the aspect of steady state, the phase modulator can continuously adjust the reactive power within the design range, and can emit capacitive reactive power and inductive reactive power. In addition, the phase modulator can provide short-circuit capacity and rotary inertia while performing reactive compensation, so that the stability of the power grid is improved.
At present, the operation control of a phase modulator depends on an Automatic Voltage Control (AVC) system of a regional power grid, but the AVC system is mainly oriented to static reactive power control, the power grid is switched to be locked when a fault occurs, the requirements of dynamic evaluation and control cannot be met, the control method is only based on the current static section, the dynamic adjustment process of a reactive power adjustment means is omitted, and particularly, when the voltage of a local power grid drops greatly due to the ultrahigh voltage direct current locking fault, the reactive voltage support function of the phase modulator in the transient process, the transition process and the steady-state process after the fault cannot be comprehensively exerted.
If the phase modulator is not brought into coordination control, the reactive compensation function of the phase modulator cannot be fully exerted, so that the overall control effect is reduced. If it is incorporated into the conventional AVC control, due to its long control period, if coordination is not sufficient, precious dynamic reactive power may be overused in steady state regulation, resulting in failure to provide support when a disturbance occurs. Therefore, the problem of multi-target reactive voltage coordination control of the phase modulator in a transient process, a transition process and a steady-state process after a fault is urgently needed to be solved.
Disclosure of Invention
The invention provides a phase modulator-based multi-target reactive voltage coordination control method and system, and aims to solve the problem of multi-target reactive voltage coordination control of a phase modulator in a transient process, a transition process and a steady-state process after a fault.
In order to solve the above problem, according to an aspect of the present invention, there is provided a phase modulator-based multi-target reactive voltage coordination control method, wherein the method includes:
establishing a power flow data and stable data model of the phase modulator accessed to the alternating current power grid by using power system simulation software according to the structure of the phase modulator accessed to the alternating current power grid;
the method comprises the steps that an alternating current-direct current system fault is adopted to check the stability of the voltage of a phase modulator near-region main network, and whether the voltage of the phase modulator near-region main network is unstable or not is judged;
when the voltage instability of a main network in a phase modulator near area is determined, the voltage of a high-voltage bus is restored by the aid of the sub-transient state and the transient state of a phase modulator body autonomous response controller voltage;
judging whether the phase modifier near area has low voltage suspension or not, and acquiring a judgment result;
when the judgment result indicates that the phase modulator near area has low-voltage suspension, calculating the short-circuit current of a main network of the phase modulator near area, and determining the voltage control reactive power demand capacity of the power grid;
through a voltage coordination control system, according to the voltage control reactive power demand capacity, a reactive power control measure of increasing the reactive power output of a phase modulator and switching a near-region low-voltage capacitor reactor in turns is adopted to quickly recover the system voltage;
and when the system voltage returns to be normal, the automatic voltage control AVC system is utilized to adjust the reactive power distribution of the power grid in the vicinity of the phase modulator, and the dynamic reactive power regulation capability of the phase modulator is recovered.
Preferably, the following formula is used to judge whether the phase modifier near zone has low voltage suspension,
Figure GDA0001766336320000031
if U isiLess than UGateAnd T isiGreater than TDelayIf so, the low voltage suspension appears in the near zone of the phase modulator, otherwise, the low voltage suspension does not appear in the near zone of the phase modulator,
wherein, UiFor the phase modifier near-region main network each substation high-voltage bus voltage, UGateFor operating the threshold value of the control voltage, TiThe time that the voltage of the high-voltage bus of each transformer substation is lower than the threshold value of the voltage is calculated; t isDelayThreshold value, U, for low voltage delayGateAnd TDelayAnd selecting according to the actual needs of the power grid operation control.
Preferably, the short-circuit capacity S of the phase modulation machine and the high-voltage bus in the near area thereof is calculated by utilizing simulation software of the power systemT_fAnd SC_fiAnd calculating the short-circuit current of the phase modulator near-zone main network according to the following formula:
Figure GDA0001766336320000032
Figure GDA0001766336320000033
wherein, ITConnecting a phase modulator with the short-circuit current of a high-voltage bus; i isiThe short-circuit current of a near-zone high-voltage bus of the phase modulator; u shapeGateIs the threshold value of the operating control voltage.
Preferably, when the system voltage is rapidly recovered by adopting reactive power control measures of increasing the reactive power output of the phase modulator and switching the low-voltage capacitive reactor in a near region in turn, the target value of the output power of the forced excitation reactive power of the phase modulator and the capacity of the low-voltage capacitive reactor which is put in each turn are set by using the following formula,
QT_ref＝(UGate-UT)×IT
Figure GDA0001766336320000034
wherein Q isT_refReactive reference value, U, for phase modulator forced excitation control targetTConnecting the suspended low voltage of the phase modulator after the fault of the high-voltage bus; i isTConnecting a phase modulator with the short-circuit current of a high-voltage bus; qC_refThe total amount of low-voltage capacitors, U, in the phase modulator near region for each switching roundGateThe sum of the total amount of the cut-off reactor and the total amount of the input capacitor; u shapeiThe low voltage is suspended low voltage after the phase modifier near-region transformer substation high-voltage bus fails; i isiThe short-circuit current of the high-voltage bus of each transformer substation of the phase modulator near-region main network is provided.
According to another aspect of the invention, a phase modulator-based multi-target reactive voltage coordination control system is provided, which is characterized by comprising:
the model establishing unit is used for establishing a model of load flow data and stable data of the phase modulator accessed to the alternating current power grid according to the structure of the phase modulator accessed to the alternating current power grid by utilizing simulation software of the power system;
the stability checking unit is used for checking the stability of the phase modulator near-region main network voltage by adopting the alternating current and direct current system fault and judging whether the phase modulator near-region main network voltage is unstable or not;
the phase modulator access unit is used for recovering the phase modulator to access the high-voltage bus voltage by autonomously responding to the voltage of the controller through the sub-transient state and the transient state of the phase modulator body when the voltage instability of a main network in a near area of the phase modulator is determined;
the low-voltage suspension judgment unit is used for judging whether the phase modifier near region has low-voltage suspension or not and acquiring a judgment result;
the reactive demand capacity determining unit is used for calculating the short-circuit current of a main network of the phase modulator near area when the judgment result indicates that the phase modulator near area has low-voltage suspension, and determining the voltage control reactive demand capacity of the power grid;
the system voltage recovery unit is used for controlling the reactive power demand capacity according to the voltage through a voltage coordination control system, and rapidly recovering the system voltage by adopting reactive power control measures of increasing the reactive power output of the phase modulator and switching the low-voltage capacitive reactor in the near region in turns;
and the reactive voltage optimization unit is used for adjusting the reactive power distribution of the power grid in the vicinity of the phase modulator by using the automatic voltage control AVC system after the system voltage returns to normal, and recovering the dynamic reactive power regulation capability of the phase modulator.
Preferably, in the low voltage levitation judging unit, whether low voltage levitation occurs in a near zone of the phase modulator is judged using the following formula,
Figure GDA0001766336320000041
if U isiLess than UGateAnd T isiGreater than TDelayIf so, the low voltage suspension appears in the near zone of the phase modulator, otherwise, the low voltage suspension does not appear in the near zone of the phase modulator,
wherein, UiFor the phase modifier near-region main network each substation high-voltage bus voltage, UGateFor operating the threshold value of the control voltage, TiThe time that the voltage of the high-voltage bus of each transformer substation is lower than the threshold value of the voltage is calculated; t isDelayThreshold value, U, for low voltage delayGateAnd TDelayAnd selecting according to the actual needs of the power grid operation control.
Preferably, in the reactive demand capacity determination unit, the short-circuit capacity S of the phase modulator and the high-voltage bus in the vicinity thereof is calculated by using power system simulation softwareT_fAnd SC_fiAnd calculating the short-circuit current of the phase modulator near-zone main network according to the following formula:
Figure GDA0001766336320000051
Figure GDA0001766336320000052
wherein, ITConnecting a phase modulator with the short-circuit current of a high-voltage bus; i isiThe short-circuit current of a near-zone high-voltage bus of the phase modulator; u shapeGateIs the threshold value of the operating control voltage.
Preferably, in the system voltage recovery unit, the output target value of the phase modulator forced excitation reactive power and the low-voltage capacitive reactance capacity put into each round are set by using the following formula,
QT_ref＝(UGate-UT)×IT
Figure GDA0001766336320000053
wherein Q isT_refReactive reference value, U, for phase modulator forced excitation control targetTConnecting the suspended low voltage of the phase modulator after the fault of the high-voltage bus; i isTConnecting a phase modulator with the short-circuit current of a high-voltage bus; qC_refThe total amount of low-voltage capacitors, U, in the phase modulator near region for each switching roundGateThe sum of the total amount of the cut-off reactor and the total amount of the input capacitor; u shapeiThe low voltage is suspended low voltage after the phase modifier near-region transformer substation high-voltage bus fails; i isiThe short-circuit current of the high-voltage bus of each transformer substation of the phase modulator near-region main network is provided.
The invention provides a phase modulator-based multi-target reactive voltage coordination control method and system, which can be used for realizing coordination control on voltage control targets in a transient process, a transition process and a steady-state process based on a phase modulator aiming at the problem of voltage stability of a local power grid caused by an extra-high voltage direct current blocking fault, providing a feasible control strategy for fully exerting the voltage supporting effect of the phase modulator on a near-area power grid, and providing references for power grid planning, operation control and the like accessed by the phase modulator.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flow chart of a phase modulator-based multi-target reactive voltage coordination control method 100 according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a multi-target reactive voltage coordinated control system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a voltage coordination control system interfacing with a phase modulator according to an embodiment of the present invention;
fig. 4 is a schematic view of a main grid frame and a power flow of a power grid in the south of a lake under the condition of south delivery of the cross section of the hunan of the fengda mode in 2018 according to the embodiment of the invention;
figure 5 is a diagram of a large-scale power flow transition triggered by keemun dc blocking fault according to an embodiment of the present invention;
fig. 6 is a diagram of a near-zone grid and a substation site of a phase modulator of a shaoshan converter station according to an embodiment of the present invention;
fig. 7 is a 500kV substation bus voltage curve 1 of the keemun dc bipolar locking converter station near region according to the embodiment of the invention;
fig. 8 is a 500kV substation bus voltage curve 2 of the keemun dc bipolar blocking converter station near zone according to an embodiment of the present invention;
fig. 9 is a 500kV substation bus voltage curve 1 of the keemun dc bipolar locking converter station near region according to an embodiment of the present invention;
fig. 10 is a 500kV substation bus voltage curve 2 in the near region of the keemun dc bipolar blocking converter station according to an embodiment of the present invention;
FIG. 11 is a graph 1 of converter station near zone 500kV bus voltage curves for Keystahao bipolar latch, accounting for phase modulators, capacitor throw, according to an embodiment of the present invention;
FIG. 12 is a Keemum Shore double-pole lockout, and a phase modulator and capacitor throw-in converter station near zone 500kV bus voltage curve diagram 2 according to an embodiment of the present invention; and
fig. 13 is a schematic structural diagram of a phase modulator-based multi-target reactive voltage coordination control system 1300 according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a phase modulator-based multi-target reactive voltage coordination control method 100 according to an embodiment of the present invention. As shown in fig. 1, the phase modifier-based multi-target reactive voltage coordination control method provided by the embodiment of the invention can realize coordination control of voltage control targets in a transient process, a transition process and a steady-state process based on a phase modifier aiming at the problem of voltage stability of a local power grid caused by an extra-high voltage direct-current blocking fault, provide a feasible control strategy for fully exerting the voltage support effect of the phase modifier on a near-area power grid, and provide references for power grid planning, operation control and the like accessed by the phase modifier. The phase modulator-based multi-target reactive voltage coordination control method 100 provided by the embodiment of the invention starts from step 101, and builds a model of load flow data and stable data of the phase modulator accessed to an alternating current power grid by using power system simulation software according to the structure of the phase modulator accessed to the alternating current power grid in step 101.
Preferably, the alternating current and direct current system fault is adopted to check the stability of the phase modifier near-region main network voltage, and whether the phase modifier near-region main network voltage is unstable is judged in step 102.
In the embodiment of the invention, the voltage stability of a main network in a near area of a phase modulator is checked by adopting alternating current and direct current system faults including alternating current system N-1 and N-2 faults and direct current blocking faults.
Preferably, when the voltage of the main network in the phase modifier near area is determined to be unstable in step 103, the phase modifier is recovered to access the voltage of the high-voltage bus by autonomously responding to the voltage of the controller through the sub-transient state and the transient state of the phase modifier body.
If the main network voltage of the phase modulator in the near area is unstable, terminal voltage control is carried out through sub-transient state and transient state autonomous response of the phase modulator within a time scale of dozens of milliseconds to 1 second, reactive fast support in the transient state process is achieved, the phase modulator is recovered to access the high-voltage bus voltage, and the control target value is the high-voltage bus voltage before failure.
Preferably, in step 104, it is determined whether low voltage levitation occurs in the near zone of the phase modulator, and the determination result is obtained.
Preferably, the following formula is used to judge whether the phase modifier near zone has low voltage suspension,
Figure GDA0001766336320000081
if U isiLess than UGateAnd T isiGreater than TDelayIf so, the low voltage suspension appears in the near zone of the phase modulator, otherwise, the low voltage suspension does not appear in the near zone of the phase modulator,
wherein, UiFor the phase modifier near-region main network each substation high-voltage bus voltage, UGateFor operating the threshold value of the control voltage, TiFor high-voltage bus of each substationTime when the voltage is below a voltage threshold; t isDelayThreshold value, U, for low voltage delayGateAnd TDelayAnd selecting according to the actual needs of the power grid operation control.
Preferably, when the judgment result indicates that the low-voltage suspension occurs in the near area of the phase modulator, the short-circuit current of the main network in the near area of the phase modulator is calculated, and the voltage control reactive demand capacity of the power grid is determined in step 105.
Preferably, the short-circuit capacity S of the phase modulation machine and the high-voltage bus in the near area thereof is calculated by utilizing simulation software of the power systemT_fAnd SC_fiAnd calculating the short-circuit current of the phase modulator near-zone main network according to the following formula:
Figure GDA0001766336320000082
Figure GDA0001766336320000083
wherein, ITConnecting a phase modulator with the short-circuit current of a high-voltage bus; i isiThe short-circuit current of a near-zone high-voltage bus of the phase modulator; u shapeGateIs the threshold value of the operating control voltage.
In the embodiment of the invention, the short-circuit capacity of the main network in the vicinity of the phase modulator is calculated to obtain the high-voltage bus connected to the phase modulator, and the short-circuit capacity of the high-voltage bus of each substation in the main network in the vicinity, so as to calculate the switching strategy of the phase modulator strong excitation and the low-voltage capacitive reactance device in the step 106.
Preferably, in step 106, the voltage coordination control system is used to control the reactive power demand capacity according to the voltage, and the reactive power control measures of increasing the reactive power output of the phase modulator and switching the low-voltage capacitor reactors in the near region in turns are adopted to quickly recover the system voltage.
Preferably, when the system voltage is rapidly recovered by adopting reactive power control measures of increasing the reactive power output of the phase modulator and switching the low-voltage capacitive reactor in a near region in turn, the target value of the output power of the forced excitation reactive power of the phase modulator and the capacity of the low-voltage capacitive reactor which is put in each turn are set by using the following formula,
QT_ref＝(UGate-UT)×IT
Figure GDA0001766336320000091
wherein Q isT_refReactive reference value, U, for phase modulator forced excitation control targetTConnecting the suspended low voltage of the phase modulator after the fault of the high-voltage bus; i isTConnecting a phase modulator with the short-circuit current of a high-voltage bus; qC_refThe total amount of low-voltage capacitors, U, in the phase modulator near region for each switching roundGateThe sum of the total amount of the cut-off reactor and the total amount of the input capacitor; u shapeiThe low voltage is suspended low voltage after the phase modifier near-region transformer substation high-voltage bus fails; i isiThe short-circuit current of the high-voltage bus of each transformer substation of the phase modulator near-region main network is provided.
In the implementation mode of the invention, the voltage of the phase modulator connected to the high-voltage bus is recovered through the voltage control of the phase modulator terminal within the time scale of tens of milliseconds to 1 second, then whether the phase modulator near area has low-voltage suspension is judged on the time scale of more than 10 seconds, if the phase modulator has low-voltage suspension, the phase modulator adopts forced excitation control on the time scale of 10 seconds to 2 minutes, and the near area low-voltage capacitor is switched in turn. By coordinately controlling the reactive power of the phase modulator, the low-voltage capacitor and the reactor, the problem of long-term low-voltage suspension of the system voltage is solved, and the system voltage is quickly recovered.
Preferably, in step 107, when the system voltage returns to normal, the automatic voltage control AVC system is used to adjust the reactive power distribution of the power grid in the vicinity of the phase modulator, so as to recover the dynamic reactive power regulation capability of the phase modulator.
In the implementation mode of the invention, within the time scale of more than 5 minutes, the automatic voltage control AVC system is utilized to carry out the reactive voltage optimization control of the power grid, a reactive replacement mode is adopted, the near-area 500kV station low-capacity low-resistance generator control is utilized to carry out the reactive voltage optimization, the dynamic reactive standby of the phase modifier is gradually recovered, the reactive voltage optimization is carried out, and the dynamic reactive standby of the phase modifier is recovered. .
The following specifically exemplifies embodiments of the present invention
The specific implementation of the present invention will be further described in detail by taking the phase modulation engineering of the Shaoshan convertor station as an example.
The multi-target reactive voltage coordination control system taking the Shaoshan convertor station phase modulator as a core is composed of a phase modulator excitation system, a voltage coordination control system and an AVC system, and is shown in figure 2. The phase modulator excitation system is integrated in a phase modulator control system, the voltage coordination control system is composed of a relevant substation stability control device, and the AVC system is composed of a scheduling end AVC main station, a phase modulator and a near-area substation AVC sub-station.
The phase modulator excitation system adopts a control strategy of combining a 'fast voltage ring + a slow reactive ring', the voltage at the end of a fast voltage ring collector is used as a voltage ring control target, the purpose of fast outputting dynamic reactive power of the phase modulator under the fault condition is realized, and the phase modulator excitation system is equivalent to an excitation system of a traditional unit, but has higher response speed than the excitation system of the traditional unit. The reactive power output of the slow reactive loop acquisition phase modulation unit is used as a reactive loop control target, and the reactive power output of the phase modulation unit is within a specified range in a steady state according to reactive instructions issued by an AVC substation or local control.
The voltage coordination control system is composed of a voltage coordination control main station and 8 voltage control sub-station stability control devices, and the voltage sub-stations can control phase modulators of 8 transformer substation low-capacity/low-resistance and Shaoshan converter stations in Hunan China. The voltage coordination control main station can receive a direct current blocking signal sent by the Kelly-Shao direct current stable control main station and monitor the voltage drop condition of the main station, and when direct current blocking faults are detected and the voltage is low for a long time, control measures for improving the reactive power of the phase modifier and switching low capacitance/low impedance are taken in turns until the system voltage returns to normal.
The AVC system comprises a dispatching end AVC main station, a phase modulator and a near-region substation AVC substation, wherein the AVC main station carries out online voltage safety domain evaluation, dynamic reactive power reserve evaluation and the like, and after the system voltage is stabilized, reactive voltage optimization and reactive power replacement in Hunan middle regions are realized by controlling reactive power of near-region power plant units and low-capacitance low-resistance of 500kV substations, and dynamic reactive power reserve of the phase modulator is gradually recovered. The voltage coordinated control system interfaces with the phase modulator as shown in fig. 3.
The specific implementation steps comprise:
1. and (4) building a data model of the phase modulator of the Shaoshan convertor station accessed to the Hunan power grid.
The phase modifier of the Shaoshan convertor station is connected to the Qishao DC Hunan-Daoshan convertor station with the capacity of 2X 300 Var. In a PSD-BPA program, establishing grid frame data containing a Shaoshan converter station phase modulator, wherein the grid frame data comprises tide data and stable data, the system reference capacity is 100MVA, and equipment parameters are per unit values taking the system reference capacity as reference. The main grid framework structure of the Hunan power grid under the condition of southward delivery of the Feng-generous Exiang section in 2018 is shown in FIG. 4.
2. And (3) checking the stability of the main network voltage in the near area of the phase modulator by adopting the fault of the alternating current-direct current system.
After the Keysao direct current bipolar latching fault occurs, the main network power flow is transferred in a large scale, the voltage of each station bus of 500kV in a power flow transfer path is reduced, and the path of power flow transfer is shown in figure 5. From the analysis of the angle of improving the voltage supporting capability along the trend transfer line, a 500kV transformer substation in the near region of the phase modulator of the Shaoshan converter station is marked as shown in figure 6 and comprises 8 stations such as Aijiachong and Heling. After keemun direct current bipolar latching fault, the voltage curve of 500kV substation bus in the shisha transformation near area is shown in fig. 7 and 8. Simulation calculation results show that the steady state recovery voltage of 500kV buses of other stations except 500kV civil Feng stations in the near region of the converter station is lower than 500kV under the influence of large-scale transfer of the damp flow, and the steady state voltage of Ding Gong, Xingcheng and Yuntan is as low as 490 kV.
3. The phase modulator is restored to be connected with the high-voltage bus voltage through the sub-transient state and transient state autonomous response of the phase modulator body.
When the instability of the main network voltage of the phase modifier in the near area is determined, the dynamic reactive support capability of the phase modifier is considered, and the voltage of the Shaoshan phase modifier terminal is controlled within a time scale of dozens of milliseconds to 1 second, so that the Shaoshan 500kV bus voltage is recovered as far as possible. The bus voltage of each 500kV substation in the near zone of the converter station is shown in fig. 9 and 10. The bus voltage of the cloud field, the aijiachong, the sandlevel, the dinggong and the starcity 500kV station is low.
4. And judging whether the main grid voltage of the Shaoshan phase change modulator near area meets the operation control requirement after the Keoshan direct current lockout fault.
The bus voltage operation control requirement of 500kV transformer substation in the region of changing from Yangshanshan of China power grid is that the steady state recovery voltage after the fault is more than 500kV, namely U Gate500 kV. Therefore, according to the simulation calculation result, after the QiShao DC blocking fault, the voltage of the phase modulator near region of the Shaoshan converter station is unstable.
5. And calculating the short-circuit capacity of the main network in the near area of the phase modulator.
And carrying out short-circuit capacity calculation on 8 500kV transformer substations in the Shaoshan converter region and Shaoshan converter station buses, wherein the calculation result is used as a calculation basis of a control strategy of a voltage coordination control system. In the calculated power flow, the normal operation bus voltage and the capacitive reactance loading condition in the Shaoshan approaching region are shown in table 1. As can be seen from Table 1, the 500kV transformer substation in the near region of the phase modulator of the Shaoshan converter station is all put into low-voltage capacitors, and no low-voltage reactor is put into the transformer substation. Therefore, only the low-voltage capacitor is considered for the subsequent low-voltage capacitive reactance switching.
TABLE 1 bus voltage and capacitive reactance input condition of 500kV site in near zone of Shaoshan convertor station
Figure GDA0001766336320000121
6. Adopts the reactive power control of a phase modulator and switches a near-region low-voltage capacitive reactor
And combining the short circuit capacity calculation result, adopting a strong excitation measure by the Shaoshan converter station phase modulator, outputting the reactive power to 300Mvar, and adopting a measure of a fast-switching capacitor, wherein the condition of the capacitor which is put into one round is shown in a table 2. The converter station near zone 500kV substation bus voltage is shown in fig. 11 and 12.
TABLE 2 bus voltage and capacitive reactance input conditions of the near 500kV station of Shaoshan convertor station
Figure GDA0001766336320000122
Figure GDA0001766336320000131
7. And adjusting the near-zone reactive power distribution of the phase modulator by using an AVC system, and recovering the dynamic reactive power regulation capability of the phase modulator.
Within the time scale of more than 5 minutes, reactive voltage optimization is carried out by utilizing the low-capacity low-impedance generator control of a 500kV station near the Shaoshan converter station phase modifier, the dynamic reactive reserve of the phase modifier is recovered, and the dynamic reactive reserve of the phase modifier is recovered by adopting a reactive replacement mode. And performing reactive voltage optimization, recovering the dynamic reactive reserve of the phase modulator, and recovering the dynamic reactive reserve of the phase modulator by adopting a reactive replacement mode.
Fig. 13 is a schematic structural diagram of a phase modulator-based multi-target reactive voltage coordination control system 1300 according to an embodiment of the present invention. As shown in fig. 13, the phase modulator-based multi-target reactive voltage coordination control system 1300 provided by the embodiment of the present invention includes: the system comprises a model establishing unit 1301, a stability checking unit 1302, a phase modulator access unit 1303, a low-voltage suspension judging unit 1304, a reactive demand capacity determining unit 1305, a system voltage recovering unit 1306 and a reactive voltage optimizing unit 1307.
Preferably, the model building unit 1301 is configured to build a model of load flow data and stable data of the phase modulator accessed to the ac power grid according to a structure of the phase modulator accessed to the ac power grid by using power system simulation software;
preferably, the stability checking unit 1302 is configured to check the stability of the main network voltage in the phase modulator near area by using an ac/dc system fault, and determine whether the main network voltage in the phase modulator near area is unstable.
Preferably, the phase modulator access unit 1303 is configured to restore the phase modulator to access the high-voltage bus voltage by autonomously responding to the controller terminal voltage through the sub-transient state and the transient state of the phase modulator body when it is determined that the phase modulator near-region main network voltage is unstable.
Preferably, the low voltage suspension determination unit 1304 is configured to determine whether low voltage suspension occurs in a near zone of the phase modulator, and obtain a determination result.
Preferably, in the low voltage levitation determination unit 1304, whether low voltage levitation occurs in the near zone of the phase modulator is determined by using the following formula,
Figure GDA0001766336320000144
if U isiLess than UGateAnd T isiGreater than TDelayIf the phase modifier near zone has low voltage suspension, otherwise, the phase modifier near zone has no low voltage suspension, wherein, UiFor the phase modifier near-region main network each substation high-voltage bus voltage, UGateFor operating the threshold value of the control voltage, TiThe time that the voltage of the high-voltage bus of each transformer substation is lower than the threshold value of the voltage is calculated; t isDelayThreshold value, U, for low voltage delayGateAnd TDelayAnd selecting according to the actual needs of the power grid operation control.
Preferably, the reactive demand capacity determining unit 1305 is configured to, when the judgment result indicates that the phase modulator near zone has low-voltage levitation, calculate a short-circuit current of a main network in the phase modulator near zone, and determine the voltage control reactive demand capacity of the power grid.
Preferably, in the reactive demand capacity determination unit 1305, the short-circuit capacity S of the phase modulation machine and the high-voltage bus in the vicinity thereof is calculated by using power system simulation softwareT_fAnd SC_fiAnd calculating the short-circuit current of the phase modulator near-zone main network according to the following formula:
Figure GDA0001766336320000141
Figure GDA0001766336320000142
wherein, ITConnecting a phase modulator with the short-circuit current of a high-voltage bus; i isiThe short-circuit current of a near-zone high-voltage bus of the phase modulator; u shapeGateFor operation controlA threshold value of the braking voltage.
Preferably, the system voltage recovery unit 1306 is configured to, through the voltage coordination control system, control the reactive demand capacity according to the voltage, and quickly recover the system voltage by adopting a reactive control measure of increasing the reactive output of the phase modulator and switching the low-voltage capacitor in the near area in turns.
Preferably, in the system voltage recovery unit 1306, the output target value of the phase modulator forced excitation reactive power and the low-voltage capacitive reactance capacity put into each round are set by using the following formula,
QT_ref＝(UGate-UT)×IT
Figure GDA0001766336320000143
wherein Q isT_refReactive reference value, U, for phase modulator forced excitation control targetTConnecting the suspended low voltage of the phase modulator after the fault of the high-voltage bus; i isTConnecting a phase modulator with the short-circuit current of a high-voltage bus; qC_refThe total amount of low-voltage capacitors, U, in the phase modulator near region for each switching roundGateThe sum of the total amount of the cut-off reactor and the total amount of the input capacitor; u shapeiThe low voltage is suspended low voltage after the phase modifier near-region transformer substation high-voltage bus fails; i isiThe short-circuit current of the high-voltage bus of each transformer substation of the phase modulator near-region main network is provided.
Preferably, the reactive voltage optimization unit 1307 is configured to, after the system voltage returns to normal, adjust the power grid reactive distribution in the vicinity of the phase modulator by using the automatic voltage control AVC system, and recover the dynamic reactive power adjustment capability of the phase modulator.
The phase modulator-based multi-target reactive voltage coordination control system 1300 of the embodiment of the present invention corresponds to the phase modulator-based multi-target reactive voltage coordination control method 100 of another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (8)

1. A multi-target reactive voltage coordination control method based on a phase modulator is characterized by comprising the following steps:
establishing a power flow data and stable data model of the phase modulator accessed to the alternating current power grid by using power system simulation software according to the structure of the phase modulator accessed to the alternating current power grid;
the method comprises the steps that an alternating current-direct current system fault is adopted to check the stability of the voltage of a phase modulator near-region main network, and whether the voltage of the phase modulator near-region main network is unstable or not is judged;
when the voltage instability of a main network in a phase modulator near area is determined, the voltage of a high-voltage bus is restored by the aid of the sub-transient state and the transient state of a phase modulator body autonomous response controller voltage;
judging whether the phase modifier near area has low voltage suspension or not, and acquiring a judgment result;
when the judgment result indicates that the phase modulator near area has low-voltage suspension, calculating the short-circuit current of a main network of the phase modulator near area, and determining the voltage control reactive power demand capacity of the power grid;
through a voltage coordination control system, according to the voltage control reactive power demand capacity, a reactive power control measure of increasing the reactive power output of a phase modulator and switching a near-region low-voltage capacitor reactor in turns is adopted to quickly recover the system voltage;
and when the system voltage is recovered to be normal, adjusting the reactive power distribution of the power grid in the vicinity of the phase modulator by using the automatic voltage control AVC system, and recovering the dynamic reactive power regulation capability of the phase modulator.
2. The method of claim 1, wherein the determination of whether low voltage levitation occurs in the phase modulator near zone is made using the following formula,
Figure FDA0002952085440000011
if U isiLess than UGateAnd T isiGreater than TDelayIf so, the low voltage suspension appears in the near zone of the phase modulator, otherwise, the low voltage suspension does not appear in the near zone of the phase modulator,
wherein, UiFor the phase modifier near-region main network each substation high-voltage bus voltage, UGateFor operating the threshold value of the control voltage, TiThe time that the voltage of the high-voltage bus of each transformer substation is lower than the threshold value of the voltage is calculated; t isDelayThreshold value, U, for low voltage delayGateAnd TDelayAnd selecting according to the actual needs of the power grid operation control.
3. The method of claim 1, wherein the short circuit capacity S of the phase modulator and its near zone high voltage bus is calculated using power system simulation softwareT_fAnd SC_fiAnd calculating the short-circuit current of the phase modulator near-zone main network according to the following formula:
Figure FDA0002952085440000021
Figure FDA0002952085440000022
wherein, ITConnecting a phase modulator with the short-circuit current of a high-voltage bus; i isiThe short-circuit current of a near-zone high-voltage bus of the phase modulator; u shapeGateIs the threshold value of the operating control voltage.
4. The method of claim 1, wherein when the system voltage is rapidly recovered by adopting the reactive power control measures of increasing the reactive power of the phase modulator and switching the low-voltage capacitive reactor in different rounds, the target value of the reactive power of the phase modulator and the low-voltage capacitive reactor capacity put into each round are set by using the following formula,
QT_ref＝(UGate-UT)×IT
Figure FDA0002952085440000023
wherein Q isT_refReactive reference value, U, for phase modulator forced excitation control targetTConnecting the suspended low voltage of the phase modulator after the fault of the high-voltage bus; i isTConnecting a phase modulator with the short-circuit current of a high-voltage bus; qC_refThe total amount of low-voltage capacitors switched in each turn in the near region of the phase modulator is the sum of the total amount of the cut-out reactors and the total amount of the input capacitors; u shapeGateA threshold value for the operating control voltage; u shapeiThe high-voltage bus voltage of each transformer substation of a main network in the near area of the phase modulator is used; i isiIs the short-circuit current of the phase modulator near-zone high-voltage bus.
5. A multi-target reactive voltage coordinated control system based on a phase modulator is characterized by comprising:
the model establishing unit is used for establishing a model of load flow data and stable data of the phase modulator accessed to the alternating current power grid according to the structure of the phase modulator accessed to the alternating current power grid by utilizing simulation software of the power system;
the stability checking unit is used for checking the stability of the phase modulator near-region main network voltage by adopting the alternating current and direct current system fault and judging whether the phase modulator near-region main network voltage is unstable or not;
the phase modulator access unit is used for recovering the phase modulator to access the high-voltage bus voltage by autonomously responding to the voltage of the controller through the sub-transient state and the transient state of the phase modulator body when the voltage instability of a main network in a near area of the phase modulator is determined;
the low-voltage suspension judgment unit is used for judging whether the phase modifier near region has low-voltage suspension or not and acquiring a judgment result;
the reactive demand capacity determining unit is used for calculating the short-circuit current of a main network of the phase modulator near area when the judgment result indicates that the phase modulator near area has low-voltage suspension, and determining the voltage control reactive demand capacity of the power grid;
the system voltage recovery unit is used for controlling the reactive power demand capacity according to the voltage through a voltage coordination control system, and rapidly recovering the system voltage by adopting reactive power control measures of increasing the reactive power output of the phase modulator and switching the low-voltage capacitive reactor in the near region in turns;
and the reactive voltage optimization unit is used for adjusting the reactive power distribution of the power grid in the vicinity of the phase modulator by using the automatic voltage control AVC system after the system voltage is recovered to be normal, and recovering the dynamic reactive power regulation capability of the phase modulator.
6. The system of claim 5, wherein the low voltage levitation judging unit judges whether or not low voltage levitation occurs in a near zone of the phase modulator using the following formula,
Figure FDA0002952085440000031
if U isiLess than UGateAnd T isiGreater than TDelayIf so, the low voltage suspension appears in the near zone of the phase modulator, otherwise, the low voltage suspension does not appear in the near zone of the phase modulator,
wherein, UiFor the phase modifier near-region main network each substation high-voltage bus voltage, UGateFor operating the threshold value of the control voltage, TiThe time that the voltage of the high-voltage bus of each transformer substation is lower than the threshold value of the voltage is calculated; t isDelayThreshold value, U, for low voltage delayGateAnd TDelayAnd selecting according to the actual needs of the power grid operation control.
7. The system according to claim 5, characterized in that in the reactive demand capacity determination unitCalculating the short-circuit capacity S of the phase modulator and the high-voltage bus in the vicinity thereof by using simulation software of the power systemT_fAnd SC_fiAnd calculating the short-circuit current of the phase modulator near-zone main network according to the following formula:
Figure FDA0002952085440000032
Figure FDA0002952085440000033
wherein, ITConnecting a phase modulator with the short-circuit current of a high-voltage bus; i isiThe short-circuit current of a near-zone high-voltage bus of the phase modulator; u shapeGateIs the threshold value of the operating control voltage.
8. The system of claim 5, wherein the target value of the output of the phase modulator forced excitation reactive power and the low-voltage capacitive reactance capacity put in each round are set in the system voltage recovery unit by using the following formula,
QT_ref＝(UGate-UT)×IT
Figure FDA0002952085440000041
wherein Q isT_refReactive reference value, U, for phase modulator forced excitation control targetTConnecting the suspended low voltage of the phase modulator after the fault of the high-voltage bus; i isTConnecting a phase modulator with the short-circuit current of a high-voltage bus; qC_refThe total amount of low-voltage capacitors switched in each turn in the near region of the phase modulator is the sum of the total amount of the cut-out reactors and the total amount of the input capacitors; u shapeGateA threshold value for the operating control voltage; u shapeiThe high-voltage bus voltage of each transformer substation of a main network in the near area of the phase modulator is used; i isiIs the short-circuit current of the phase modulator near-zone high-voltage bus.
CN201810564131.0A 2018-06-04 2018-06-04 Phase modulator-based multi-target reactive voltage coordination control method and system Active CN108964073B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810564131.0A CN108964073B (en) 2018-06-04 2018-06-04 Phase modulator-based multi-target reactive voltage coordination control method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810564131.0A CN108964073B (en) 2018-06-04 2018-06-04 Phase modulator-based multi-target reactive voltage coordination control method and system

Publications (2)

Publication Number Publication Date
CN108964073A CN108964073A (en) 2018-12-07
CN108964073B true CN108964073B (en) 2021-07-06

Family

ID=64493417

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810564131.0A Active CN108964073B (en) 2018-06-04 2018-06-04 Phase modulator-based multi-target reactive voltage coordination control method and system

Country Status (1)

Country Link
CN (1) CN108964073B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109742769B (en) * 2019-01-24 2022-12-30 国家电网有限公司 Reactive power replacement method and system for direct-current receiving end area phase modulator
CN110148951B (en) * 2019-06-25 2021-01-08 许继集团有限公司 Double-target voltage coordination control method and control device for dynamic reactive power compensation device
CN110212567A (en) * 2019-07-09 2019-09-06 江苏方天电力技术有限公司 High voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier
CN110224411B (en) * 2019-07-12 2023-01-24 国网山东省电力公司临沂供电公司 Point selection and volume fixing method for reactive voltage emergency coordination control system
CN110797920B (en) * 2019-11-08 2021-01-26 国家电网公司华中分部 Direct-current near-region multi-resource reactive voltage coordination control method and device
CN110854871B (en) * 2019-11-20 2021-04-27 广东颢能能源科技有限公司 High-proportion new energy power grid transient voltage stability optimization control method
CN111371102A (en) * 2020-03-12 2020-07-03 国电南瑞科技股份有限公司 Method for coordinated control of phase modulator and static reactive power compensation equipment of converter station
CN112688354B (en) * 2020-12-14 2023-03-10 河海大学 Multi-objective optimization control method and system for excitation system of synchronous phase modulator
CN112751318B (en) * 2020-12-24 2023-08-22 中国电力科学研究院有限公司 Multi-dimensional electric quantity-based loss of magnetic protection method and system for camera
CN115207935B (en) * 2022-09-13 2023-02-14 国网江西省电力有限公司电力科学研究院 Reactive power coordination optimization method for improving transient voltage stability of voltage weak area
CN116260154B (en) * 2023-05-11 2023-08-18 华北电力科学研究院有限责任公司 Phase modulation unit control method, device and system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9935576B1 (en) * 2016-10-25 2018-04-03 Regal Beloit America, Inc. Methods and controllers for operation of electric motors
CN107230979B (en) * 2017-07-31 2019-10-11 国家电网公司 A kind of power grid automatic voltage optimal control method
CN107749630B (en) * 2017-10-19 2020-03-06 中国电力科学研究院有限公司 Near-region power grid voltage coordination emergency control method of phase modulator
CN107742889B (en) * 2017-10-19 2020-06-16 国网浙江省电力公司电力科学研究院 Converter station AVC control strategy and system containing phase modulator
CN108110783B (en) * 2017-12-28 2021-05-14 国家电网公司 Method and device for coordination control between synchronous phase modulator and LCC-HVDC

Also Published As

Publication number Publication date
CN108964073A (en) 2018-12-07

Similar Documents

Publication Publication Date Title
CN108964073B (en) Phase modulator-based multi-target reactive voltage coordination control method and system
Zhao et al. Power system support functions provided by smart inverters—A review
CN102882229B (en) Automatic control system for dynamic voltage of wind power plant
Papangelis et al. Stability of a voltage source converter subject to decrease of short-circuit capacity: A case study
US20150005970A1 (en) Distributed Control in Electric Power Delivery Systems
CN104935073B (en) Laminar dispersion is concentrated to coordinate the method that control improves stability of power system using Large Scale Wind Farm Integration STATCOM
WO2021253368A1 (en) Coordinated control system and method of wind turbine and statcom for suppressing unbalanced voltage in dispersed wind farm
CN104201694A (en) Novel hybrid intelligent dynamic reactive power compensation system and control method thereof
Fu et al. Control strategy of system coordination in Nanao multi-terminal VSC-HVDC project for wind integration
AU2022391351A1 (en) Frequency modulation method, device and system based on new energy support machine and energy storage device, and new energy station
CN109904866A (en) A kind of the micro-grid connection control method for coordinating and its system of polynary energy storage
CN109659964B (en) Method and device for preventing direct current locking
CN105425063A (en) New island protection control method based on wide area information
CN109494738A (en) A kind of electric network fault fast and stable control method of automatic synchronization control
CN106711925B (en) self-adaptive three-phase reclosing lock for single loop outgoing line of wind power plant and method thereof
CN112086970B (en) Configuration method and device of energy storage power station, electronic equipment and storage medium
CN102842920A (en) AC (alternating current) /DC (direct current) coordinating and control method for restraining large-scale wind turbine tripping
CN112600219A (en) Dynamic reactive power standby optimization method for alternating current-direct current power grid
Kumar et al. Mitigation of Harmonics and power quality enhancement for SEIG based wind farm using ANFIS based STATCOM
CN110994624A (en) Voltage control method for avoiding voltage out-of-limit caused by extra-high voltage direct current converter station fault
CN111953012B (en) Method and system for restraining AC/DC temporary overvoltage
CN110148968B (en) Fault recovery control method for photovoltaic direct-current grid-connected system
CN104201684B (en) Low frequency low voltage load shedding optimization control method based on load control sensitivity
CN111224408A (en) Regional power grid frequency support system based on distributed energy storage device
An et al. Application of wide area monitoring protection and control in an electricity distribution network

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant