CN110854899B - Energy storage-camera power support system for HVDC and power distribution method thereof - Google Patents
Energy storage-camera power support system for HVDC and power distribution method thereof Download PDFInfo
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Classifications
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
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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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- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses an energy storage-regulation machine power support system for a high-voltage direct-current transmission weak receiving end system and a power distribution method thereof. The system comprises a camera, a battery energy storage system, an energy storage bidirectional grid-connected converter and a control module; the energy storage active power control, the energy storage reactive power control, the bidirectional grid-connected conversion control and the excitation control of the phase-change regulator respectively control an energy storage output active power reference value, an energy storage output reactive power reference value, an energy storage output power actual value and an excitation voltage of the phase-change regulator. The invention can rapidly and simultaneously provide sufficient active and reactive power to improve the lowest point of the voltage and the frequency of the receiving-end alternating-current system after the commutation failure fault of the direct-current transmission system and accelerate the recovery process, thereby meeting the requirement of the high-voltage direct-current transmission weak receiving-end alternating-current power grid on the storage of high-capacity active power and reactive power.
Description
Technical Field
The invention belongs to the technical field of control and protection of power systems, and particularly relates to an energy storage-regulation machine power support system for High Voltage Direct Current (HVDC) and a power distribution method thereof.
Background
Along with the rapid development of a long-distance large-capacity power transmission system, the scale of the influence of direct current commutation failure on an alternating current system is continuously increasing. The commutation failure of the inversion station seriously affects the stable operation of the receiving end alternating current system, and particularly when the grid structure of the receiving end system is weak, the occurrence frequency of the commutation failure is obviously improved.
To reduce the adverse effects caused by commutation failure, the main measures can be divided into two main categories: by adjusting the inverter station controller and by configuring additional reactive compensation means. The configuration of the additional reactive compensation device is more suitable for the current actual engineering requirement, and the new generation of high-capacity phase modulators can meet the requirement of high-capacity dynamic active and reactive power of high-voltage direct-current transmission end and receiving end systems, and are put into use in northwest and eastern China. It can work under strong transient overload condition, increase short-circuit capacity of weak AC system and provide inertial response. The energy storage system is combined with the phase regulator, so that more powerful power support can be provided for the weak alternating current network after the commutation failure fault occurs. Therefore, in order to realize the coordination between the camera and the energy storage system and exert the synergistic effect of the camera and the energy storage system, a reasonable and feasible control method is needed.
The time scale from occurrence to recovery of a single commutation failure is typically hundreds of milliseconds, so the response speed is critical. The existing control method has more steps or needs to rely on a scheduling instruction, and the rapidity cannot be ensured.
Disclosure of Invention
The invention aims to provide an energy storage-regulation machine power support system for HVDC and a power distribution method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an energy storage-phase-change machine power support system for HVDC comprises a phase-change machine, a battery energy storage system, an energy storage bidirectional grid-connected converter and a control module; the phase-change device is connected to the high-voltage bus through a step-up transformer; the direct current side of the energy storage bidirectional grid-connected converter is connected with a battery energy storage system, and the alternating current side is connected to a high-voltage bus through a transformer; the control module comprises an energy storage active power controller, an energy storage reactive power controller, a bidirectional grid-connected conversion controller and a regulator excitation controller; the energy storage active power controller and the energy storage reactive power controller are commonly connected to the bidirectional grid-connected conversion controller; the camera excitation controller is connected with the camera; the bidirectional grid-connected conversion controller is connected with the energy storage bidirectional grid-connected converter.
Further, a power distribution method for an energy storage-conditioning machine power support system of HVDC, comprising the distribution method of:
energy storage active power control: the frequency adjustment device is used for realizing frequency adjustment of the alternating current bus;
energy storage reactive power control: the device is used for participating in the voltage regulation of the alternating current bus;
bidirectional grid-connected conversion control: the tracking device is used for tracking the actual output power of the energy storage system to the reference power;
excitation control of a camera: the method is used for realizing the adjustment of the voltage of the high-voltage bus.
Further, in the energy storage active power control, when the generated energy is not matched with the load and when the direct current transmission system fails to commutate or is locked, power output is provided; variable parameter PI control is used; the calculation formula of the adopted active power reference value is as follows:
P B,ref ＝K p,P (f G -f G,ref )+K i,P ∫(f G -f G,ref )
p in the formula B,ref For the active power reference value, K output by the energy storage active power controller p,P And K i,P Variable parameter proportional coefficient and integral coefficient of active power, f G Is the frequency of the power grid, f G,ref Is the reference frequency of the power grid, a p 、a i For the change rate of the active proportion and integral coefficient, m is the change duration of the active proportion coefficient, t s The time for starting to enter a steady state for adjusting the output power of the camera; and each parameter is respectively set according to the energy storage capacity and the camera capacity.
Further, in the energy storage reactive power control, when commutation fails or dc blocking occurs, based on variable parameter PI control, a reactive power reference value adopted in the energy storage reactive power control is calculated as follows:
Q B,ref ＝K p,Q (U G -U G,ref )+K i,Q ∫(U G -U G,ref )
q in B,ref Outputting a powerless reference value K for the energy storage reactive power controller p,Q And K i,Q Variable parameter proportional coefficient and integral coefficient of reactive power, U G,ref For high voltage bus voltage rating, U G B is the actual measurement value of the voltage of the high-voltage bus p 、b i And n is the change duration of the reactive power proportional coefficient, and each parameter is respectively set according to the energy storage and the capacity of the regulating camera.
Further, the bidirectional grid-connected transformation control is vector control based on grid voltage orientation, under d-q frame, knowing the output active power reference values PB and ref of the energy storage system and the output reactive power reference values QB and ref of the energy storage system, the current reference values of the d axis and the q axis are calculated by the following equation
The d-axis is based on a power grid voltage vector, UG, q=0, a current reference value is calculated from a power reference and UG, d, a difference value between the reference current and an estimated current is sent to a proportional-integral controller to realize non-steady-state deviation control, and after d-q to alpha-beta coordinate transformation is carried out on the output of the proportional-integral controller, corresponding switch driving signals Sa, sb and Sc of the bidirectional grid-connected converter are obtained through space vector pulse width modulation, so that tracking of actual output power of an energy storage system to the reference power is realized; the position of the power grid voltage vector is obtained through measurement; firstly, detecting instantaneous values ua, ub and uc of low-voltage side voltage of an energy storage grid-connected converter, and then obtaining expressions ualpha and ubeta of grid voltage under alpha-beta coordinates by coordinate transformation from a three-phase static coordinate system abc to a two-phase static coordinate system alpha beta, thereby obtaining voltage vector positions, namely
Furthermore, the excitation control of the phase regulator adopts a static excitation regulator, and the proper excitation voltage V is calculated from the high-voltage bus voltage measured value and the phase regulator terminal voltage measured value f The voltage of the high-voltage bus is regulated; exciting voltage signal V f And sending the droop coefficient to the energy storage reactive power controller to be used as a weighting factor of the droop coefficient in the energy storage reactive power control method.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the voltage of the phase-change machine terminal, the voltage of the current-converting bus and the frequency of the power grid at the receiving terminal are obtained through real-time measurement, and the power output of the phase-change machine and the stored energy is rapidly obtained after the phase-change failure occurs, so that the voltage and the frequency support can be provided in time. And by reasonably setting parameters of each sub-controller, the power requirements of different phases of commutation failure and the reactive capacity difference of the energy storage and the phase-change machine are fully considered, and the rationality of power output target distribution is ensured. The invention combines the energy storage system with the camera through the control method, and better realizes the synergistic effect in the aspect of providing sufficient active and reactive power support. The control method can exert the respective advantages of the energy storage and the phase adjustment after the fault, and the provided dynamic active and reactive support has the characteristics of high speed, large capacity and the like, and can meet the requirements of high-capacity dynamic active power and reactive power when the high-voltage direct-current transmission system is in fault.
Drawings
Fig. 1 is a diagram of a connection of an energy storage-conditioning camera power support system for HVDC at the receiving end of a HVDC transmission system;
fig. 2 is a diagram of the overall coordinated control of an energy storage-conditioning camera power support system for HVDC;
FIG. 3 is a schematic diagram of an energy storage grid-connected inverter control;
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a connection diagram of an energy storage-regulation machine power support system for HVDC at a receiving end of a HVDC transmission system is shown. The power distribution method for the energy storage-phase-change machine power support system for the HVDC is implemented by the energy storage-phase-change machine power support system for the HVDC, and the energy storage-phase-change machine power support system for the HVDC comprises a phase-change machine, a battery energy storage system, an energy storage bidirectional grid-connected converter and a control module. The phase-change device is connected to the high-voltage bus through a step-up transformer; the direct current side of the energy storage bidirectional grid-connected converter is connected with a battery energy storage system, and the alternating current side is connected to a high-voltage bus through a transformer; the control module comprises an energy storage active power controller, an energy storage reactive power controller, a bidirectional grid-connected conversion controller and a regulator excitation controller; the energy storage active power controller and the energy storage reactive power controller are commonly connected to the bidirectional grid-connected conversion controller; the camera excitation controller is connected with the camera; the bidirectional grid-connected conversion controller is connected with the energy storage bidirectional grid-connected converter. The system is suitable for a high-voltage direct-current transmission weak receiving end power grid, when commutation failure or direct-current locking occurs, the energy storage system releases active power to realize frequency response, and meanwhile, the energy storage system and the phase regulator jointly provide a large amount of reactive power to realize voltage support.
Referring to fig. 2, a coordinated control overall architecture diagram of an energy storage-conditioning power support system for HVDC. The power distribution method of the energy storage-phase-change machine power support system for the HVDC is characterized by comprising an energy storage active power control method, an energy storage reactive power control method, a bidirectional grid-connected transformation control method and a phase-change machine excitation control method.
The power distribution method for the power support system of the energy storage-regulation machine for the HVDC is characterized by comprising the following steps of: the energy storage active power control method aims at realizing the frequency adjustment of the alternating current bus. When the power generation amount and the load are not matched, the frequency of the power grid fluctuates. When a dc transmission system fails to commutate or is locked, a large amount of active power shortage occurs in the ac system at the receiving end, which usually results in a very serious frequency drop. To provide active power support for system frequency recovery, PI control is based on a variable parameter. The calculation formula of the adopted active power reference value is as follows:
P B,ref ＝K p,P (f G -f G,ref )+K i,P ∫(f G -f G,ref )
p in the formula B,ref For the active power reference value, K output by the energy storage active power controller p,P And K i,P Variable parameter proportional coefficient and integral coefficient of active power, f G Is the frequency of the power grid, f G,ref Is the reference frequency of the power grid, a p 、a i For the change rate of the active proportion and integral coefficient, m is the change duration of the active proportion coefficient, t s The time for the camera output power to begin to enter steady state. And each parameter is respectively set according to the energy storage capacity and the camera capacity.
The power distribution method for the power support system of the energy storage-regulation machine for the HVDC is characterized by comprising the following steps of: in the energy storage reactive power control, when commutation fails or DC locking occurs, based on variable parameter PI control, a reactive power reference value calculation formula adopted by the energy storage reactive power control is as follows:
Q B,ref ＝K p,Q (U G -U G,ref )+K i,Q ∫(U G -U G,ref )
q in B,ref Outputting a powerless reference value K for the energy storage reactive power controller p,Q And K i,Q Variable parameter proportional coefficient and integral coefficient of reactive power, U G,ref For high voltage bus voltage rating, U G B is the actual measurement value of the voltage of the high-voltage bus p 、b i And n is the change duration of the reactive power proportional coefficient, and each parameter is respectively set according to the energy storage and the capacity of the regulating camera.
The power distribution method for the power support system of the energy storage-regulation machine for the HVDC is characterized by comprising the following steps of: the excitation control of the phase regulator adopts a static excitation regulator, and calculates proper excitation voltage V from the measured value of high-voltage bus voltage and the measured value of phase regulator terminal voltage f The voltage of the high-voltage bus is regulated.Exciting voltage signal V f And sending the droop coefficient to the energy storage reactive power controller to be used as a weighting factor of the droop coefficient in the energy storage reactive power control method.
See the bi-directional grid-tie conversion control block diagram shown in fig. 3. The power distribution method for the power support system of the energy storage-regulation machine for the HVDC is characterized by comprising the following steps of: the bidirectional grid-connected transformation control method is vector control based on grid voltage orientation. Under the d-q framework, the output active power reference value P of the energy storage system is known B,ref And an output reactive power reference value Q of the energy storage system B,ref The d-axis and q-axis current references are calculated from the following equation
Since the d-axis is based on the grid voltage vector, U G,q =0, so that, irrespective of other losses, one can make the sum from the power reference and U G,d A current reference value is calculated. The difference between the reference current and the estimated current is sent to a proportional-integral controller to realize the control of no steady-state deviation, and after the output of the proportional-integral controller is transformed from d-q to alpha-beta coordinates, the corresponding switch driving signal S of the bidirectional grid-connected converter can be obtained through space vector pulse width modulation a 、S b And S is c And the tracking of the actual output power of the energy storage system to the reference power is realized. The control performance of the bidirectional grid-connected transformation control method mainly depends on accurate acquisition of the voltage vector position of the power grid. The position of the power grid voltage vector is obtained through measurement in the method. Firstly, detecting the instantaneous value u of the low-voltage side voltage of the energy storage grid-connected converter a 、u b 、u c Then, the coordinate transformation from the three-phase static coordinate system (abc) to the two-phase static coordinate system (alpha beta) is carried out to obtain the expression u of the grid voltage under the alpha-beta coordinate α 、u β Thereby obtaining the voltage vector position, i.e
It will be readily understood by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or the like falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (2)
1. A power distribution method for an energy storage-conditioner power support system for HVDC, the system comprising:
the system comprises a camera, a battery energy storage system, an energy storage bidirectional grid-connected converter and a control module; the phase-change device is connected to the high-voltage bus through a step-up transformer; the direct current side of the energy storage bidirectional grid-connected converter is connected with a battery energy storage system, and the alternating current side is connected to a high-voltage bus through a transformer; the control module comprises an energy storage active power controller, an energy storage reactive power controller, a bidirectional grid-connected conversion controller and a regulator excitation controller; the energy storage active power controller and the energy storage reactive power controller are commonly connected to the bidirectional grid-connected conversion controller; the camera excitation controller is connected with the camera; the bidirectional grid-connected conversion controller is connected with the energy storage bidirectional grid-connected converter;
the method comprises the following allocation methods:
energy storage active power control: the frequency adjustment device is used for realizing frequency adjustment of the alternating current bus;
energy storage reactive power control: the device is used for participating in the voltage regulation of the alternating current bus;
bidirectional grid-connected conversion control: the tracking device is used for tracking the actual output power of the energy storage system to the reference power;
excitation control of a camera: the device is used for realizing the adjustment of the voltage of the high-voltage bus;
in the energy storage active power control, when the generated energy and the load are not matched, and when the direct current transmission system fails in commutation or is locked in direct current, power output is provided; variable parameter PI control is used; the calculation formula of the adopted active power reference value is as follows:
P B,ref ＝K p,P (f G -f G,ref )+K i,P ∫(f G -f G,ref )
p in the formula B,ref For the active power reference value, K output by the energy storage active power controller p,P And K i,P Variable parameter proportional coefficient and integral coefficient of active power, f G Is the frequency of the power grid, f G,ref Is the reference frequency of the power grid, a p 、a i For the change rate of the active proportion and integral coefficient, m is the change duration of the active proportion coefficient, t s The time for starting to enter a steady state for adjusting the output power of the camera; setting each parameter according to the energy storage and the capacity of the camera;
in the energy storage reactive power control, when commutation fails or DC locking occurs, based on variable parameter PI control, a reactive power reference value calculation formula adopted by the energy storage reactive power control is as follows:
Q B,ref ＝K p,Q (U G -U G,ref )+K i,Q ∫(U G -U G,ref )
q in B,ref Outputting a powerless reference value K for the energy storage reactive power controller p,Q And K i,Q Variable parameter proportional coefficient and integral coefficient of reactive power, U G,ref For high voltage bus voltage rating, U G B is the actual measurement value of the voltage of the high-voltage bus p 、b i The change rate of the reactive power proportion and the integral coefficient is used, n is the change duration of the reactive power proportion coefficient, and each parameter is respectively set according to the energy storage and the capacity of the regulating camera;
the bidirectional grid-connected conversion control is vector control based on grid voltage orientation, under d-q frame, knowing the output active power reference values PB and ref of the energy storage system and the output reactive power reference values QB and ref of the energy storage system, the current reference values of d axis and q axis are calculated by the following equation
The d-axis is based on a power grid voltage vector, UG, q=0, a current reference value is calculated from a power reference and UG, d, a difference value between the reference current and an estimated current is sent to a proportional-integral controller to realize non-steady-state deviation control, and after d-q to alpha-beta coordinate transformation is carried out on the output of the proportional-integral controller, corresponding switch driving signals Sa, sb and Sc of the bidirectional grid-connected converter are obtained through space vector pulse width modulation, so that tracking of actual output power of an energy storage system to the reference power is realized; the position of the power grid voltage vector is obtained through measurement; firstly, detecting instantaneous values ua, ub and uc of low-voltage side voltage of an energy storage grid-connected converter, and then obtaining expressions ualpha and ubeta of grid voltage under alpha-beta coordinates by coordinate transformation from a three-phase static coordinate system abc to a two-phase static coordinate system alpha beta, thereby obtaining voltage vector positions, namely
2. A power distribution method for an energy storage-phase-change machine power support system for HVDC according to claim 1, wherein the phase-change machine excitation control employs a stationary excitation regulator, and the appropriate excitation voltage V is calculated from the high voltage bus voltage measurement and the phase-change machine terminal voltage measurement f The voltage of the high-voltage bus is regulated; exciting voltage signal V f And sending the droop coefficient to the energy storage reactive power controller to be used as a weighting factor of the droop coefficient in the energy storage reactive power control method.
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| CN103490450A (en) * | 2013-10-14 | 2014-01-01 | 北京艾科迈新能源科技有限公司 | Energy storage parallel control method for middle-voltage and low-voltage micro-grid and device |
| CN105140936A (en) * | 2015-10-12 | 2015-12-09 | 贵州电网公司信息通信分公司 | Micro-grid frequency modulation control method with lowest power generation cost |
| CN110544938A (en) * | 2018-05-29 | 2019-12-06 | 南京南瑞继保电气有限公司 | Low-voltage microgrid grid-connected and off-grid control method containing battery and super capacitor |
| CN108879751A (en) * | 2018-07-10 | 2018-11-23 | 南瑞集团有限公司 | Inhibit energy storage, phase modulation machine control system and the method for the continuous commutation failure of direct current |
| CN109066759A (en) * | 2018-08-16 | 2018-12-21 | 重庆大学 | Take into account the continuous commutation failure control method of mixing double feed-in d. c. power transmission system of electric network active balance |
| CN109687473A (en) * | 2019-02-18 | 2019-04-26 | 国网山东省电力公司电力科学研究院 | A kind of compound dynamic power support system and its method |
| CN110661274A (en) * | 2019-09-29 | 2020-01-07 | 国网山东省电力公司电力科学研究院 | Composite dynamic power support system and coordination control method thereof |
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