CN110854899A - Energy storage-phase modifier power supporting system for HVDC and power distribution method thereof - Google Patents
Energy storage-phase modifier power supporting system for HVDC and power distribution method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—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
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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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- 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]
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Abstract
The invention discloses an energy storage-phase modifier power supporting system for HVDC and a power distribution method thereof, which are suitable for a high-voltage direct-current transmission weak receiving end system. The system comprises a phase modulator, 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 phase modulator excitation control 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 the excitation voltage of the phase modulator. The invention can rapidly and simultaneously provide sufficient active power and reactive power so as 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 occurs and accelerate the recovery process, thereby meeting the requirement of the high-capacity active power and reactive power reserve of the high-voltage direct current transmission weak receiving end alternating current power grid.
Description
Technical Field
The invention belongs to the technical field of control and protection of power systems, and particularly relates to an energy storage-phase modifier power supporting system for HVDC and a power distribution method thereof.
Background
With the rapid development of long-distance large-capacity power transmission systems, the scale of the influence of direct-current commutation failure on alternating-current systems is continuously increasing. The stable operation of the receiving-end alternating current system is seriously influenced by the commutation failure of the inversion station, and particularly when the grid structure of the receiving-end system is weak, the frequency of the commutation failure is obviously improved.
In order to reduce the adverse effect caused by commutation failure, the main measures can be divided into two categories: by adjusting the inverter controller and by configuring additional reactive power compensation devices. The new generation of high-capacity phase modulator can meet the requirement of high-capacity dynamic active and reactive power of a high-voltage direct-current transmission transmitting end system and a high-voltage direct-current transmission receiving end system, and is already put into use in northwest and east China. It can work under the condition of strong instantaneous overload, increase the short-circuit capacity of weak AC system and provide inertial response. The energy storage system is combined with the phase modulator, so that stronger power support can be provided for the weak alternating current network after a commutation failure fault occurs. Therefore, in order to realize the coordination between the phase modulator and the energy storage system and exert the synergistic interaction of the phase modulator 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 response speed is critical. The existing control method has more steps or needs to rely on a scheduling instruction, and the rapidity cannot be guaranteed.
Disclosure of Invention
The invention aims to provide an energy storage-phase modifier power support system for HVDC and a power distribution method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
an energy storage-phase modifier power support system for HVDC comprises a phase modifier, a battery energy storage system, an energy storage bidirectional grid-connected converter and a control module; the phase modulator 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 of the energy storage bidirectional grid-connected converter 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 phase modulator excitation controller; the energy storage active power controller and the energy storage reactive power controller are connected to the bidirectional grid-connected conversion controller together; the phase modulator excitation controller is connected with the phase modulator; 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-phase modifier power support system of HVDC comprises the following distribution methods:
energy storage active power control: the frequency adjustment of the alternating current bus is realized;
energy storage reactive power control: the system is used for participating in AC bus voltage regulation;
bidirectional grid connection 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 phase modulator: the method is used for realizing the adjustment of the high-voltage bus voltage.
Furthermore, in the energy storage active power control, when the generated energy is not matched with the load, and when the phase commutation failure or the direct current locking of the direct current power transmission system occurs, power output is provided; using variable parameter PI control; the calculation formula of the active power reference value is as follows:
PB,ref＝Kp,P(fG-fG,ref)+Ki,P∫(fG-fG,ref)
in the formula PB,refReference value of active power, K, for the output of the energy-storing active power controllerp,PAnd Ki,PRespectively a variable parameter proportional coefficient and an integral coefficient of active power, fGIs the grid frequency, fG,refIs the grid reference frequency, ap、aiIs the change rate of the active proportional and integral coefficients, m is the change duration of the active proportional coefficient, tsThe time for the phase modulator to start to enter a steady state; and setting each parameter according to the capacity of the energy storage and phase modulator respectively.
Further, in the energy storage reactive power control, when the commutation fails or the dc blocking occurs, based on the variable parameter PI control, the reactive power reference value calculation formula adopted by the energy storage reactive power control is as follows:
QB,ref＝Kp,Q(UG-UG,ref)+Ki,Q∫(UG-UG,ref)
in the formula QB,refOutputting a no-power reference value, K, for an energy-storage reactive power controllerp,QAnd Ki,QRespectively, a variable parameter proportional coefficient and an integral coefficient of reactive power, UG,refFor high-voltage bus voltage rating, UGIs a measured value of the voltage of the high-voltage bus, bp、biThe variable rate is the change rate of the reactive proportion and the integral coefficient, n is the change duration of the reactive proportion coefficient, and each parameter is respectively set according to the capacity of the energy storage and phase modulator.
Further, the bidirectional grid-connected transformation control is vector control based on grid voltage orientation, under a d-q framework, 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 are known, and then 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 grid voltage vector, UG and q are 0, a current reference value is calculated from power reference and UG and d, a difference value between reference current and estimated current is sent to a proportional-integral controller to realize unsteady state deviation control, the output of the proportional-integral controller is subjected to coordinate transformation from d-q to α - β, switching driving signals Sa, Sb and Sc corresponding to a bidirectional grid-connected converter are obtained through space vector pulse width modulation, tracking of actual output power of an energy storage system to reference power is realized, the position of the grid voltage vector is obtained through measurement, instantaneous values ua, ub and uc of voltage on the low-voltage side of the energy storage grid-connected converter are detected, and then coordinate transformation from a three-phase static coordinate system abc to a two-phase static coordinate system αβ is carried out to obtain expressions u α and u β of the grid voltage under α - β coordinates, so that the position of the voltage vector is obtained, namely the position
Further, the excitation control of the phase modulator adopts a static excitation regulator, and the proper excitation voltage V is calculated from the voltage measurement value of the high-voltage bus and the voltage measurement value of the phase modulatorfThe voltage of the high-voltage bus is adjusted; excitation voltage signal VfAnd sending the data to an energy storage reactive power controller as a weighting factor of a droop coefficient in the energy storage reactive power control method.
Compared with the prior art, the invention has the following technical effects:
the invention obtains the voltage of the phase modulator, the voltage of the commutation bus and the frequency of the receiving-end power grid through real-time measurement, quickly obtains the power output of the phase modulator and the stored energy after the commutation failure occurs, and can provide voltage and frequency support in time. And by reasonably setting parameters of each sub-controller, the power requirements of different stages of commutation failure and the difference of the reactive capacities of the energy storage and phase modulators are fully considered, and the reasonability of power output target distribution is ensured. The invention combines the energy storage system and the phase modulator through a control method, and better realizes the synergistic effect in the aspect of providing sufficient active and reactive power support. The control method can exert respective advantages of the energy storage and phase modulation machine after the fault, the provided dynamic active and reactive supports have the characteristics of high speed, large capacity and the like, and the requirements of the high-voltage direct-current transmission system on high-capacity dynamic active power and reactive power during the fault can be met.
Drawings
Fig. 1 is a connection diagram of an energy storage-phase modifier power support system for HVDC at a receiving end of a high voltage direct current transmission system;
FIG. 2 is a general block diagram of the cooperative control of an energy storage-phase modifier power support system for HVDC;
FIG. 3 is a control schematic diagram of an energy storage grid-connected converter;
Detailed Description
The invention is further described below with reference to the accompanying drawings.
For better clarity of the description of the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a connection diagram of an energy storage-phase modifier power support system for HVDC at a receiving end of a high voltage direct current transmission system. The power distribution method of the energy storage-phase modifier power support system for the HVDC is implemented by the energy storage-phase modifier power support system for the HVDC, and the energy storage-phase modifier power support system for the HVDC comprises a phase modifier, a battery energy storage system, an energy storage bidirectional grid-connected converter and a control module. The phase modulator 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 of the energy storage bidirectional grid-connected converter 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 phase modulator excitation controller; the energy storage active power controller and the energy storage reactive power controller are connected to the bidirectional grid-connected conversion controller together; the phase modulator excitation controller is connected with the phase modulator; 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 phase commutation failure or direct-current locking occurs, the energy storage system releases active power to achieve frequency response, and meanwhile, the energy storage system and the phase modulator provide a large amount of reactive power together to achieve voltage support.
Referring to fig. 2, a general structure diagram of a power support system for an energy storage-phase modifier for HVDC is shown in cooperation with control. The power distribution method of the energy storage-phase modifier 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 conversion control method and a phase modifier excitation control method.
The power distribution method of the energy storage-phase modifier power support system for HVDC is characterized in that: the energy storage active power control method aims to realize frequency adjustment of an alternating current bus. When the power generation and the load are not matched, the frequency of the power grid fluctuates. When a commutation failure or dc blocking occurs in a dc power transmission system, a large active power shortage occurs in the receiving ac system, which usually results in a very severe frequency drop. In order to provide active power support for system frequency recovery, the control method is based on variable parameter PI control. The calculation formula of the active power reference value is as follows:
PB,ref＝Kp,P(fG-fG,ref)+Ki,P∫(fG-fG,ref)
in the formula PB,refReference value of active power, K, for the output of the energy-storing active power controllerp,PAnd Ki,PRespectively a variable parameter proportional coefficient and an integral coefficient of active power, fGIs the grid frequency, fG,refIs the grid reference frequency, ap、aiIs the change rate of the active proportional and integral coefficients, m is the change duration of the active proportional coefficient, tsThe time at which the phase modulator output power begins to enter steady state. And setting each parameter according to the capacity of the energy storage and phase modulator respectively.
The power distribution method of the energy storage-phase modifier power support system for HVDC is characterized in that: in the energy storage reactive power control, when the commutation fails or direct current blocking occurs, based on variable parameter PI control, the reactive power reference value calculation formula adopted by the energy storage reactive power control is as follows:
QB,ref＝Kp,Q(UG-UG,ref)+Ki,Q∫(UG-UG,ref)
in the formula QB,refOutputting a no-power reference value, K, for an energy-storage reactive power controllerp,QAnd Ki,QRespectively, a variable parameter proportional coefficient and an integral coefficient of reactive power, UG,refFor high-voltage bus voltage rating, UGIs a measured value of the voltage of the high-voltage bus, bp、biThe variable rate is the change rate of the reactive proportion and the integral coefficient, n is the change duration of the reactive proportion coefficient, and each parameter is respectively set according to the capacity of the energy storage and phase modulator.
The power distribution method of the energy storage-phase modifier power support system for HVDC is characterized in that: the phase modulator excitation control adopts a static excitation regulator, and calculates proper excitation voltage V from a high-voltage bus voltage measurement value and a phase modulator terminal voltage measurement valuefAnd the adjustment of the voltage of the high-voltage bus is realized. Excitation voltage signal VfAnd sending the data to an energy storage reactive power controller as a weighting factor of a droop coefficient in the energy storage reactive power control method.
Referring to fig. 3, a bidirectional grid-connected conversion control block diagram is shown. The power distribution method of the energy storage-phase modifier power support system for HVDC is characterized in that: the bidirectional grid-connected transformation control method is based on vector control of grid voltage orientation. Under the d-q framework, the output active power reference value P of the known energy storage systemB,refAnd the output reactive power reference value Q of the energy storage systemB,refThen the d-axis and q-axis current reference values are calculated by the following equation
Since the d-axis is based on the grid voltage vector, UG,q0, so that when used without taking into account other losses, can be derived from the power reference and UG,dCalculating a current reference value, sending a difference value between the reference current and the estimated current to a proportional-integral controller to realize unsteady state deviation control, and obtaining a corresponding switch driving signal S of the bidirectional grid-connected converter through space vector pulse width modulation after the output of the proportional-integral controller is subjected to d-q to α - β coordinate transformationa、SbAnd ScAnd tracking the actual output power of the energy storage system to the reference power is realized. Such pairThe control performance of the grid-connected transformation control method mainly depends on accurate acquisition of the grid voltage vector position. The position of the grid voltage vector in the method is obtained through measurement. Firstly, detecting the voltage instantaneous value u of the low-voltage side of the energy storage grid-connected convertera、ub、ucAnd then obtaining an expression u of the grid voltage under α - β coordinates through coordinate transformation from a three-phase static coordinate system (abc) to a two-phase static coordinate system (αβ)α、uβTo obtain a voltage vector position, i.e.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. An energy storage-phase modifier power supporting system for HVDC is characterized by comprising a phase modifier, a battery energy storage system, an energy storage bidirectional grid-connected converter and a control module; the phase modulator 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 of the energy storage bidirectional grid-connected converter 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 phase modulator excitation controller; the energy storage active power controller and the energy storage reactive power controller are connected to the bidirectional grid-connected conversion controller together; the phase modulator excitation controller is connected with the phase modulator; the bidirectional grid-connected conversion controller is connected with the energy storage bidirectional grid-connected converter.
2. A power distribution method for an energy storage-phase modifier power support system for HVDC, characterized in that, based on the energy storage-phase modifier power support system for HVDC of claim 1, it comprises the following distribution methods:
energy storage active power control: the frequency adjustment of the alternating current bus is realized;
energy storage reactive power control: the system is used for participating in AC bus voltage regulation;
bidirectional grid connection 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 phase modulator: the method is used for realizing the adjustment of the high-voltage bus voltage.
3. The power distribution method of an energy storage-phase modifier power support system for HVDC according to claim 2, characterized in that in the energy storage active power control, when the generated energy and the load are not matched, and when the direct current transmission system has a commutation failure or direct current blocking, the power output is provided; using variable parameter PI control; the calculation formula of the active power reference value is as follows:
PB,ref＝Kp,P(fG-fG,ref)+Ki,P∫(fG-fG,ref)
in the formula PB,refReference value of active power, K, for the output of the energy-storing active power controllerp,PAnd Ki,PRespectively a variable parameter proportional coefficient and an integral coefficient of active power, fGIs the grid frequency, fG,refIs the grid reference frequency, ap、aiIs the change rate of the active proportional and integral coefficients, m is the change duration of the active proportional coefficient, tsThe time for the phase modulator to start to enter a steady state; and setting each parameter according to the capacity of the energy storage and phase modulator respectively.
4. The power distribution method for the power support system of the energy storage-phase modifier of the HVDC according to claim 2, wherein in the energy storage reactive power control, when the commutation fails or the DC blocking occurs, based on the variable parameter PI control, the reactive power reference value calculation formula adopted by the energy storage reactive power control is as follows:
QB,ref＝Kp,Q(UG-UG,ref)+Ki,Q∫(UG-UG,ref)
in the formula QB,refOutputting a no-power reference value, K, for an energy-storage reactive power controllerp,QAnd Ki,QRespectively, a variable parameter proportional coefficient and an integral coefficient of reactive power, UG,refFor high-voltage bus voltage rating, UGIs a measured value of the voltage of the high-voltage bus, bp、biThe variable rate is the change rate of the reactive proportion and the integral coefficient, n is the change duration of the reactive proportion coefficient, and each parameter is respectively set according to the capacity of the energy storage and phase modulator.
5. The power distribution method for an energy storage-phase modifier power support system of HVDC according to claim 2, characterized in that the bidirectional grid-connection transformation control is a vector control based on grid voltage orientation, and under d-q framework, given the output active power reference value PB, ref of the energy storage system and the output reactive power reference value QB, ref of the energy storage system, the current reference values of d-axis and q-axis are calculated by the following equations
The d axis is based on a grid voltage vector, UG and q are 0, a current reference value is calculated from power reference and UG and d, a difference value between reference current and estimated current is sent to a proportional-integral controller to realize unsteady state deviation control, the output of the proportional-integral controller is subjected to coordinate transformation from d-q to α - β, switching driving signals Sa, Sb and Sc corresponding to a bidirectional grid-connected converter are obtained through space vector pulse width modulation, tracking of actual output power of an energy storage system to reference power is realized, the position of the grid voltage vector is obtained through measurement, instantaneous values ua, ub and uc of voltage on the low-voltage side of the energy storage grid-connected converter are detected, and then coordinate transformation from a three-phase static coordinate system abc to a two-phase static coordinate system αβ is carried out to obtain expressions u α and u β of the grid voltage under α - β coordinates, so that the position of the voltage vector is obtained, namely the position
6. A method of distributing power for an energy storage-phase modifier power support system for HVDC as claimed in claim 2 in which the phase modifier excitation control uses a static excitation regulator and calculates the appropriate excitation voltage V from the high voltage bus voltage measurement and the phase modifier voltage measurementfThe voltage of the high-voltage bus is adjusted; excitation voltage signal VfAnd sending the data to an energy storage reactive power controller as a weighting factor of a droop coefficient in the energy storage reactive power control method.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114552613A (en) * | 2021-12-31 | 2022-05-27 | 南方电网调峰调频发电有限公司 | Reactive power comprehensive control method, device, equipment and medium for chain type energy storage device |
| CN115377992A (en) * | 2022-06-27 | 2022-11-22 | 国网浙江省电力有限公司丽水供电公司 | Power converter fault ride-through control method suitable for wide-range flexible hydrogen production |
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