CN109687473B - Composite dynamic power support system and method thereof - Google Patents
Composite dynamic power support system and method thereof Download PDFInfo
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- CN109687473B CN109687473B CN201910121196.2A CN201910121196A CN109687473B CN 109687473 B CN109687473 B CN 109687473B CN 201910121196 A CN201910121196 A CN 201910121196A CN 109687473 B CN109687473 B CN 109687473B
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a composite dynamic power support system and a method thereof, wherein the composite dynamic power support system comprises a phase modulator (1), an energy storage system, a phase modulator local regulating and controlling device (5), an energy storage local regulating and controlling device (6) and a power comprehensive scheduling management system (7), wherein an alternating current outlet of the energy storage system is connected with an alternating current outlet of the phase modulator (1) and then is accessed to an alternating current power grid at a receiving end of an extra-high voltage direct current transmission system; the power comprehensive regulation and control management system (7) is connected with the power grid dispatching system and receives dispatching instructions from the power grid dispatching system. The system integrates the reactive support capability of the phase modulator (1) and the rapid active response capability of the energy storage system by combining local control and centralized control, provides active and reactive power support for a receiving-end alternating current power grid in the process of direct current locking of the extra-high voltage direct current transmission converter valve, and improves the safe and stable operation capability of the traditional alternating current power grid after the traditional alternating current power grid is connected into an extra-high voltage direct current transmission system.
Description
Technical Field
The invention belongs to the technical field of energy storage, and relates to a novel composite dynamic active power and reactive power support system applied to the condition of phase conversion failure of an extra-high voltage direct current converter valve and an operation control method design thereof.
Background
At present, China is still in the industrialized and urbanized propulsion stage, the power demand still keeps increasing rapidly in the middle and long term, the middle east area as a power load center keeps unchanged for a long time, and the distribution and development characteristics of energy resources in China determine the further western and north shift of the national energy development strategy. Therefore, with the change of power supply layout in China, in order to meet the needs of economic development, an extra-high voltage large power grid is built, and western large-scale renewable energy sources are transmitted to the middle east region, which is still the inevitable choice for power grid development in China.
Under the new potential of energy internet such as large-scale wind power access, extra-high voltage interconnection and the like, higher requirements are provided for the peak regulation, frequency regulation and voltage regulation capabilities of a regional power grid, and higher grid source coordination support capability is required. In the process of phase conversion failure of the extra-high voltage direct current converter valve, direct current voltage, current and power are all changed violently, and therefore impact is generated on an alternating current system. If the factors causing the commutation failure cannot be cleared in time, the commutation failure may also cause a dc latch. For a short-time commutation failure, the dc inverter can usually recover normal commutation after the fault is cleared. For a long-time continuous commutation failure, a direct-current protection system may be caused to block direct current, so that a large impact is caused to an alternating-current and direct-current power transmission system, and even a power grid is broken down.
The high-capacity phase modulator serving as a reactive power generation device has unique advantages of improving the short-circuit ratio of a receiving-end alternating current power grid, improving the direct current transmission limit power and enhancing the strength and flexibility of the power grid. When a fault occurs at the near end of an alternating current power grid or the voltage of a direct current converter valve fails to change the phase, the high-capacity phase modulator can carry out strong excitation to support the voltage and stabilize the system, thereby gaining precious time for removing the fault; under the condition that the converter valve of the extra-high voltage direct current system is locked due to faults or an active load is suddenly thrown, the converter valve can enter a phase-in running state to absorb a large amount of excess reactive power, so that the voltage rise of the system is inhibited; when the voltage of the extra-high voltage direct current system needs to be regulated during steady state normal operation, the continuous adjustable dynamic reactive power support can be provided for the alternating current power grid in a phase-delay or phase-advance operation state. However, the traditional phase modulator can significantly enhance the inertia of a regional power grid system, provide emergency reactive voltage support for the system, and cannot rapidly supplement the active power shortage of the system.
The energy storage technology is a strategic support technology for future energy structure transformation and power production consumption mode transformation, can solve the problems of intermittency and random fluctuation of renewable energy power generation, relieves the demand of peak load power supply, and improves the utilization rate of the existing power grid equipment and the operating efficiency of a power grid; the power supply system can also be used for dealing with sudden faults of a power grid, improving the quality of electric energy and meeting the requirements of economic and social development on high-quality, safe and reliable power supply. The precise control and quick response characteristics of the energy storage battery make the energy storage battery have received wide attention in participating in power grid auxiliary services. Energy storage battery demonstration projects with frequency modulation functions are available at home and abroad, and the fact that the advantages of the energy storage battery are played in power grid frequency modulation is a hot problem of current research based on the global requirement of power grid operation. The energy storage battery assists in frequency modulation of the power grid, so that the amplitude of the power grid capable of bearing maximum load disturbance can be remarkably improved, and the anti-interference capability of the power grid is effectively improved.
Disclosure of Invention
The invention aims to organically integrate an energy storage technology and a phase modulator technology, designs a novel composite dynamic power support system, can simultaneously and quickly compensate active and reactive power shortage of the system caused by extra-high voltage direct current commutation failure, and improves the safe and stable operation capability of a power grid in a new energy interconnection form.
Based on the aim, the invention provides a novel dynamic active and reactive composite support system consisting of a phase modulator and an energy storage system, which can provide reactive compensation for a power grid in transient, transient and steady ranges by utilizing the phase modulator, can quickly, flexibly and efficiently provide short-time large-capacity active power support for the system by means of energy storage, and can maximally smooth or reduce the voltage and frequency fluctuation of a receiving-end area power grid caused by phase change failure of an extra-high voltage direct current converter valve, thereby realizing large direct current power transmission and strong reactive support and improving the safety and stability of an alternating current and direct current hybrid power grid under the condition of strong direct current and weak alternating current;
by utilizing the provided composite dynamic power support system, the active and reactive spare capacities of the system can be actively participated in the voltage and frequency regulation of the receiving-end regional power grid through the accurate reactive regulation capacity of the phase regulator and the accurate active regulation capacity of the energy storage system when the extra-high voltage direct current transmission system normally operates, the power auxiliary regulation service of the extra-high voltage receiving-end voltage is participated in, and the power supply reliability and the power supply and electric energy quality of the regional power grid are improved.
The invention provides a novel composite dynamic power support system, which comprises a phase modulator, an energy storage system, a phase modulator local regulating device, an energy storage local regulating device and a power comprehensive scheduling management system, wherein the phase modulator is connected with the energy storage system through a power supply; the alternating current outlet of the energy storage system is connected with the alternating current outlet of the phase modulator and then is connected to a receiving end alternating current power grid of the ultra-high voltage direct current transmission system; the local regulation and control device collects the real-time running states of the energy storage system and the phase modifier on one hand and uploads the real-time running states to the power comprehensive regulation and control management system on the other hand, receives the instruction from the power comprehensive regulation and control management system and sends the instruction to the energy storage system and the phase modifier to complete execution; and the power comprehensive regulation and control management system is connected with the power grid dispatching system and receives dispatching instructions from the power grid dispatching system.
Further, the energy storage system comprises a step-up transformer, an energy storage converter and an energy storage element.
Further, the energy storage element is a lithium battery, a flow battery, a sodium-sulfur battery, a lead-carbon battery or a super capacitor.
Further, charging and discharging of the energy storage element are managed through the energy storage converter, and the energy storage converter adopts a three-phase half-bridge VSR topological structure.
Furthermore, the phase modulation machine local regulation and control device issues a reactive power regulation instruction target to the phase modulation machine in real time and acquires the running state information of the phase modulation machine in real time.
Furthermore, the energy storage local regulating and controlling device issues an active regulating instruction target to the energy storage converter in real time and acquires the running state information of the energy storage converter and the energy storage element in real time.
Furthermore, the power integrated dispatching management system issues an operation state instruction to the phase modulation machine local regulating and controlling device and the energy storage local regulating and controlling device, and the phase modulation machine local regulating and controlling device and the energy storage local regulating and controlling device upload the operation state information of the phase modulation machine, the energy storage converter and the energy storage element to the power integrated dispatching management system in real time.
Further, the state instruction comprises a power auxiliary adjustment service state such as voltage adjustment, peak regulation, frequency modulation and the like or an emergency active and reactive support state.
The invention also provides an operation method of the power support system, which is characterized in that,
when the ultra-high voltage direct current transmission system normally operates, the power support system operates in an electric power auxiliary regulation service state through the dispatching management of the power comprehensive dispatching management system; when the extra-high voltage direct current transmission system has direct current commutation failure or even direct current blocking fault, the novel composite dynamic power support system operates in an emergency active and reactive support state through the dispatching management of the power comprehensive dispatching management system.
Furthermore, when the power support system operates in an electric power auxiliary regulation service state, the phase modulator is controlled by the phase modulator local regulation and control device to actively participate in voltage regulation of the receiving-end alternating current power grid, and the voltage quality of the receiving-end alternating current power grid is improved; the energy storage system is controlled by the energy storage local regulation and control device to operate in a P/Q mode or a droop mode, and actively participates in power regulation auxiliary services such as frequency modulation and peak shaving of a receiving-end alternating current power grid.
Furthermore, when the power support system operates in an emergency active and reactive support state, the phase modulator is controlled by the phase modulator local regulating and controlling device to provide reactive support for a receiving end alternating current power grid; the energy storage system is controlled by an energy storage local regulation and control device to operate in a P/Q mode or a droop mode, and active support is provided for a receiving-end alternating current power grid.
Furthermore, the operation state of the phase modulator is adjusted according to the requirement of a receiving end alternating current power grid of the ultra-high voltage direct current transmission system, and the operation scheduling instruction of the phase modulator is issued by the phase modulator local regulating and controlling device.
Further, when the phase modulator is in overexcitation operation, reactive power is sent to a power grid; when the phase modulator is in underexcitation operation, reactive power is absorbed from a power grid, so that the phase modulator actively participates in voltage regulation service of a receiving-end alternating current power grid.
The invention also provides a power supporting method of the extra-high voltage transmission system, which combines the phase modulator technology and the energy storage technology by adopting a mode of combining local control and centralized control, provides reactive compensation for a power grid by utilizing the phase modulator, and provides short-time large-capacity active power support for the system by depending on the energy storage system, thereby providing active and reactive power support for a receiving-end alternating current power grid in the process of direct current locking of the extra-high voltage direct current transmission converter valve.
Further, local regulating and controlling devices are configured for the energy storage system and the phase modifier, and a power comprehensive scheduling management system is configured; the local regulation and control device collects the real-time running states of the energy storage system and the phase modifier and uploads the real-time running states to the power comprehensive regulation and control management system; and on the other hand, the comprehensive power regulation and control management system is connected with a power grid dispatching system and receives dispatching instructions from the power grid dispatching system.
Further, the method specifically comprises:
carrying out information interaction with a control and protection system of the ultra-high voltage direct current transmission system by adopting a power comprehensive scheduling management system so as to obtain the running state of the ultra-high voltage direct current transmission system in real time and judge whether a direct current blocking fault occurs or not;
when a direct current blocking fault occurs, the power comprehensive scheduling management system quickly uploads information to a superior power grid for scheduling, and respectively sends an active adjusting instruction and a reactive adjusting instruction to an energy storage local adjusting and controlling device and a phase modifier local adjusting and controlling device according to the power grid scheduling instruction, and the energy storage local adjusting and controlling device and the phase modifier local adjusting and controlling device respectively control the active and reactive requirements of the energy storage system and the phase modifier quick response system until the direct current blocking is eliminated;
when the ultra-high voltage direct current transmission system normally operates, the power comprehensive dispatching management system receives instruction information from superior power grid dispatching in real time, and respectively issues an active dispatching instruction and a reactive dispatching instruction to the energy storage local regulating and controlling device and the phase modulator local regulating and controlling device in real time, so that the energy storage system and the phase modulator are controlled to respond to active and reactive requirements of a power grid, and power regulation auxiliary services such as active participation of power grid voltage regulation, peak regulation, frequency regulation and the like are realized.
Furthermore, when a direct current blocking fault occurs, the phase modulator is controlled by the phase modulator local regulating and controlling device to provide reactive support for a receiving end alternating current power grid; the energy storage system is controlled by an energy storage local regulation and control device to operate in a P/Q mode or a droop mode, and active support is provided for a receiving-end alternating current power grid.
Furthermore, when the extra-high voltage direct current transmission system normally operates, the phase modulator is controlled by the phase modulator local regulation and control device to actively participate in voltage regulation of the receiving end alternating current power grid, so that the voltage quality of the receiving end alternating current power grid is improved; the energy storage system is controlled by the energy storage local regulation and control device to operate in a P/Q mode or a droop mode, and actively participates in power regulation auxiliary services such as voltage regulation, frequency regulation, peak regulation and the like of a receiving-end alternating current power grid.
The invention has the following beneficial effects:
(1) the technical scheme organically integrates the phase modulator technology and the energy storage technology, provides reactive compensation for a power grid in the transient state and steady state ranges of the phase modulator, simultaneously provides short-time large-capacity active power support for the system by virtue of an energy storage system quickly, flexibly and efficiently, can provide accurate and controllable active and reactive power support for a receiving-end alternating current power grid in the process of phase conversion failure and even direct current locking of an extra-high voltage direct current transmission converter valve, avoids cascading failure and improves the safety and stability of the operation of an alternating current and direct current hybrid power grid;
(2) when the extra-high voltage direct current transmission system normally operates, the system can provide power regulation auxiliary services such as frequency modulation, voltage regulation, peak regulation and the like for an extra-high direct current transmission receiving end alternating current power grid by utilizing the accurate active and reactive power regulation capacity of the system, and the operation safety stability and the economical efficiency of the alternating current power grid are improved.
Drawings
Fig. 1 is a structural diagram of a novel composite dynamic power support system of the present invention.
Fig. 2 is a block diagram of the energy storage converter shown in fig. 1.
FIG. 3 is a flow chart for the dynamic power support method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Fig. 1 shows a structural diagram of the novel composite dynamic power support system according to the present invention.
As shown in fig. 1, the novel composite dynamic power support system comprises a phase modulator 1, a step-up transformer 2, an energy storage converter 3, an energy storage element 4, a phase modulator local control device 5, an energy storage local control device 6 and a power comprehensive scheduling management system 7.
In the system, a boosting transformer 2, an energy storage converter 3 and an energy storage element 4 form an energy storage system, and an alternating current outlet of the energy storage system and an alternating current outlet of a phase modulator 1 are connected in parallel to a receiving end alternating current power grid of the extra-high voltage direct current transmission system. And the power comprehensive regulation and control management system 7 is connected with the power grid dispatching system and interacts with the phase modulator local regulation and control device 5 and the energy storage local regulation and control device 6.
The energy storage element 4 may be a lithium battery, a flow battery, a sodium-sulfur battery, a lead-carbon battery, a super capacitor, or the like.
The charging and discharging of the energy storage element 4 are accurately managed through the energy storage converter 3, and the energy storage converter 3 adopts a three-phase half-bridge VSR topological structure. In the system, the energy storage converter 3 always operates in a P/Q mode or a droop mode.
The energy storage local regulating and controlling device 6 issues a successful regulating instruction target to the energy storage converter 3 in real time and obtains the running state information of the energy storage converter 3 and the energy storage element 4 in real time.
The phase modulation machine local regulation and control device 5 issues a reactive power regulation instruction target to the phase modulation machine 1 in real time and acquires the running state information of the phase modulation machine 1 in real time.
The operation state of the phase modulator 1 is adjusted according to the requirements of a receiving end alternating current power grid of the ultra-high voltage direct current transmission system, and an operation scheduling instruction is issued by the phase modulator local regulating and controlling device 5. When the generator is in overexcitation operation, reactive power is sent to a power grid; when under-excited operation, reactive power is absorbed from the power grid, so that the voltage regulation service of the receiving-end alternating current power grid is actively participated in.
The power integrated dispatching management system 7 issues operating state instructions (power auxiliary regulating service states such as voltage regulation, peak regulation, frequency regulation and the like or emergency active and reactive supporting states) to the phase modulator local regulating device 5 and the energy storage local regulating device 6, and the phase modulator local regulating device 5 and the energy storage local regulating device 6 upload operating state information of the phase modulator 1, the energy storage converter 3 and the energy storage element 4 to the power integrated dispatching management system 7 in real time.
And the power comprehensive scheduling management system 7 is accessed to the power grid scheduling system and receives the unified scheduling management of the power grid scheduling system.
When the ultra-high voltage direct current transmission system normally operates, the novel composite dynamic power support system operates in an electric power auxiliary regulation service state through the dispatching management of the power comprehensive dispatching management system 7, the phase modulator 1 is controlled by the phase modulator local regulation and control device 5 to actively participate in the voltage regulation of the receiving end alternating current power grid, and the voltage quality of the receiving end alternating current power grid is improved. The energy storage system is controlled by the energy storage local regulation and control device 6 to operate in a P/Q mode or a droop mode, and actively participates in power regulation auxiliary services such as frequency modulation and peak shaving of a receiving-end alternating current power grid.
When the extra-high voltage direct current transmission system has direct current commutation failure or even direct current blocking fault, the novel composite dynamic power support system operates in an emergency active and reactive support state through the dispatching management of the power comprehensive dispatching management system 7. The phase modulator 1 is controlled by a phase modulator local regulating and controlling device 5 to provide reactive support for a receiving-end alternating current power grid; the energy storage system is controlled by the energy storage local regulation and control device 6 to operate in a P/Q mode or a droop mode, and active support is provided for a receiving-end alternating current power grid.
Fig. 2 shows a specific configuration of the energy storage converter 3.
As shown in fig. 2, the energy storage converter employs a three-phase half-bridge VSR topology. The power supply comprises power switching tubes G1, G2, G3, G4, G5 and G6, freewheeling diodes D1, D2, D3, D4, D5 and D6, a direct-current side filter capacitor C1 and alternating-current side three-phase filter inductors L1, L2 and L3.
The drains of the power switch tubes G1, G3 and G5 are connected together to the anode of the DC filter capacitor C1, the sources of the power switch tubes G1, G3 and G5 are respectively connected with the drains of the power switch tubes G2, G4 and G6, and the sources of the power switch tubes G2, G4 and G6 are connected together to the cathode of the DC filter capacitor C2. Freewheeling diodes D1, D3, D5, D2, D4 and D6 are connected in anti-parallel between the drain-source electrodes of the power switching tubes G1, G2, G3, G4, G5 and G6, respectively. L1, L2, and L3 are three-phase filter inductors on the ac side.
The active power of the alternating current side of the converter can be quickly and accurately controlled by controlling the on-off of the switch tubes.
The invention also provides a power supporting method of the ultra-high voltage transmission system, which combines the phase modulator technology and the energy storage technology by adopting a mode of combining local control and centralized control, provides reactive compensation for the power grid in transient, transient and steady ranges by utilizing the phase modulator, and provides short-time large-capacity active power support for the system by depending on the energy storage system, thereby providing active and reactive power support for the receiving-end alternating current power grid in the process of direct current locking of the ultra-high voltage direct current transmission converter valve.
Specifically, in the above method:
local regulating devices are respectively configured for the energy storage system and the phase modulator 1, and a power comprehensive scheduling management system 7 is configured at the same time; on one hand, the local regulation and control device collects the real-time running states of the energy storage system and the phase modifier 1 and uploads the real-time running states to the power comprehensive regulation and control management system 7; on the other hand, the comprehensive power regulation and control management system 7 receives the instruction from the power regulation and control management system 7 and sends the instruction to the energy storage system and the phase modulator 1 to complete execution, and the comprehensive power regulation and control management system 7 is connected with the power grid dispatching system and receives the dispatching instruction from the power grid dispatching system.
FIG. 3 illustrates a flow chart of a dynamic power support method of the present invention.
As shown in fig. 3, the flow of the above method is specifically as follows:
and the power comprehensive dispatching management system 7 performs information interaction with a control and protection system of the ultra-high voltage direct current transmission system so as to acquire the running state of the ultra-high voltage direct current transmission system in real time and judge whether a direct current blocking fault occurs.
When a direct current blocking fault occurs, a rapid active and support mode is entered, the power comprehensive scheduling management system 7 rapidly uploads information to the upper-level power grid for scheduling, an active adjusting instruction and a reactive adjusting instruction are respectively issued to the energy storage local adjusting and controlling device 6 and the phase modulator local adjusting and controlling device 5 according to the power grid scheduling instruction, and the active and reactive requirements of the energy storage system and the phase modulator 1 rapid response system are respectively controlled by the energy storage local adjusting and controlling device 6 and the phase modulator local adjusting and controlling device 5 until the direct current blocking is eliminated.
When the extra-high voltage direct current transmission system normally operates, the power grid auxiliary service mode is entered, the power comprehensive dispatching management system 7 receives instruction information from the dispatching of a superior power grid in real time, and respectively issues an active dispatching instruction and a reactive dispatching instruction to the energy storage local regulating and controlling device 6 and the phase modulator local regulating and controlling device 5 in real time, so that the energy storage system and the phase modulator 1 are controlled to respond to active and reactive requirements of the power grid, and active participation in power grid voltage regulation, peak regulation, frequency regulation and other power regulation auxiliary services is realized.
Further, in the power supporting method, when a direct current blocking fault occurs, the phase modulator 1 is controlled by the phase modulator local control device 5 to provide reactive power support for a receiving end alternating current power grid; the energy storage system is controlled by the energy storage local regulation and control device 6 to operate in a P/Q mode or a droop mode, and active support is provided for a receiving-end alternating current power grid.
When the extra-high voltage direct current transmission system normally operates, the phase modulator 1 is controlled by the phase modulator local regulating and controlling device 5 to actively participate in voltage regulation of a receiving-end alternating current power grid, and the voltage quality of the receiving-end alternating current power grid is improved; the energy storage system is controlled by the energy storage local regulation and control device 6 to operate in a P/Q mode or a droop mode, and actively participates in the power regulation auxiliary service of voltage regulation, frequency regulation and peak regulation of a receiving-end alternating current power grid.
While the best mode for carrying out the invention has been described in detail and illustrated in the accompanying drawings, it is to be understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the invention should be determined by the appended claims and any changes or modifications which fall within the true spirit and scope of the invention should be construed as broadly described herein.
Claims (16)
1. The composite dynamic power support system is characterized by comprising a phase modulator (1), an energy storage system, a phase modulator local regulating and controlling device (5), an energy storage local regulating and controlling device (6) and a power comprehensive scheduling management system (7); the alternating current outlet of the energy storage system is connected with the alternating current outlet of the phase modulator (1) and then is connected to a receiving end alternating current power grid of the extra-high voltage direct current transmission system; the local regulation and control devices (5, 6) collect the real-time running states of the energy storage system and the phase modifier (1) on one hand and upload the real-time running states to the power comprehensive scheduling management system (7), and receive the instructions from the power comprehensive scheduling management system (7) on the other hand and send the instructions to the energy storage system and the phase modifier (1) to complete execution; the power comprehensive scheduling management system (7) is connected with the power grid scheduling system and receives a scheduling instruction from the power grid scheduling system; when the extra-high voltage direct current transmission system normally operates, the power support system operates in an electric power auxiliary regulation service state through the dispatching management of the power comprehensive dispatching management system (7); when the extra-high voltage direct current transmission system has direct current commutation failure or even direct current blocking fault, the composite dynamic power support system operates in an emergency active and reactive support state through the dispatching management of the power comprehensive dispatching management system (7).
2. Power support system according to claim 1, characterized in that the energy storage system comprises a step-up transformer (2), an energy storage converter (3), an energy storage element (4).
3. Power support system according to claim 2, characterized in that the energy storage element (4) is a lithium battery, a flow battery, a sodium-sulfur battery, a lead-carbon battery or a supercapacitor.
4. The power support system according to claim 3, characterized in that charging and discharging of the energy storage element (4) is managed via the energy storage converter (3), the energy storage converter (3) adopting a three-phase half-bridge VSR topology.
5. The power support system of claim 4, wherein said phase modulation in-situ regulation and control device (5) issues reactive power regulation command targets to said phase modulation machine (1) in real time and obtains operating status information of said phase modulation machine (1) in real time.
6. The power support system according to claim 2, characterized in that the energy storage local control device (6) issues an active control command target to the energy storage converter (3) in real time and obtains the operating state information of the energy storage converter (3) and the energy storage element (4) in real time.
7. The power support system according to claim 2, wherein the integrated power dispatching management system (7) issues an operation state instruction to the phase modulation machine local control device (5) and the energy storage local control device (6), and the phase modulation machine local control device (5) and the energy storage local control device (6) upload operation state information of the phase modulation machine (1), the energy storage converter (3) and the energy storage element (4) to the integrated power dispatching management system (7) in real time.
8. The power support system of claim 7, wherein the status instructions comprise a voltage regulation, peak shaving, frequency modulated power assisted regulation service status or an emergency active and reactive support status.
9. A method of operating a power support system according to any of claims 1-8,
when the power support system operates in an electric power auxiliary regulation service state, the phase modulator (1) is controlled by the phase modulator local regulation and control device (5) to actively participate in voltage regulation of a receiving-end alternating current power grid, and the voltage quality of the receiving-end alternating current power grid is improved; the energy storage system is controlled by the energy storage local regulation and control device (6) to operate in a P/Q mode or a droop mode, and actively participates in the power regulation auxiliary service of frequency modulation and peak shaving of a receiving end alternating current power grid.
10. A method of operating a power support system according to any one of claims 1 to 8, wherein the phase modifier (1) is controlled by the phase modifier in-situ control means (5) to provide reactive support to the ac receiving grid when the power support system is operating in an emergency active and reactive support mode; the energy storage system is controlled by an energy storage local regulation and control device (6) to operate in a P/Q mode or a droop mode, and active support is provided for a receiving end alternating current power grid.
11. The method according to claim 10, characterized in that the operating state of the phase modulator (1) is adjusted according to the requirements of a receiving end alternating current grid of the extra-high voltage direct current transmission system, and the operation scheduling instruction is issued by the phase modulator local control device (5).
12. Method according to claim 11, characterized in that when the phase modulator (1) is over-excited running, reactive power will be emitted to the grid; when the phase modulator (1) runs under excitation, reactive power is absorbed from a power grid, so that the phase modulator actively participates in the voltage regulation service of a receiving-end alternating current power grid.
13. A power supporting method of an extra-high voltage transmission system is characterized in that a mode of combining local control and centralized control is adopted, a phase modulation technology is combined with an energy storage technology, a phase modulator (1) is utilized to provide reactive compensation for a power grid, meanwhile, the energy storage system is utilized to provide short-time active power support for the system, and therefore active power support and reactive power support are provided for a receiving end alternating current power grid in the process of direct current locking of an extra-high voltage direct current transmission converter valve; a power comprehensive dispatching management system (7) is adopted to carry out information interaction with a control protection system of the extra-high voltage direct current transmission system so as to acquire the running state of the extra-high voltage direct current transmission system in real time and judge whether a direct current blocking fault occurs or not;
when a direct current blocking fault occurs, the power comprehensive scheduling management system (7) uploads information to a superior power grid for scheduling, and respectively sends an active adjusting instruction and a reactive adjusting instruction to an energy storage local adjusting and controlling device (6) and a phase modifier local adjusting and controlling device (5) according to the power grid scheduling instruction, and the energy storage local adjusting and controlling device (6) and the phase modifier local adjusting and controlling device (5) respectively control the energy storage system and the phase modifier (1) to quickly respond to the active and reactive requirements of the system until the direct current blocking is eliminated;
when an extra-high voltage direct current transmission system normally operates, the power comprehensive dispatching management system (7) receives instruction information from superior power grid dispatching in real time, and issues an active dispatching instruction and a reactive dispatching instruction in real time to the energy storage local regulating and controlling device (6) and the phase modulator local regulating and controlling device (5) respectively, so that the energy storage system and the phase modulator (1) are controlled to respond to active and reactive requirements of a power grid, and power regulation auxiliary services actively participating in power grid voltage regulation, peak regulation and frequency modulation are achieved.
14. A method according to claim 13, characterized by configuring local regulation means for each of the energy storage system and phase modifier (1) while configuring a power integrated schedule management system (7); the local regulation and control device collects the real-time running states of the energy storage system and the phase modulator (1) and uploads the real-time running states to the power comprehensive scheduling management system (7); on the other hand, the power comprehensive dispatching management system (7) is connected with the power grid dispatching system and receives dispatching instructions from the power grid dispatching system.
15. A method according to claim 14, characterized in that the phase modulator (1) is controlled by a phase modulator local control device (5) to provide reactive support for the receiving ac grid when a dc blocking fault occurs; the energy storage system is controlled by an energy storage local regulation and control device (6) to operate in a P/Q mode or a droop mode, and active support is provided for a receiving end alternating current power grid.
16. The method according to claim 15, wherein when the extra-high voltage direct current transmission system normally operates, the phase modulator (1) is controlled by the phase modulator local regulation and control device (5) to actively participate in voltage regulation of the receiving end alternating current power grid, so that the voltage quality of the receiving end alternating current power grid is improved; the energy storage system is controlled by the energy storage local regulation and control device (6) to operate in a P/Q mode or a droop mode, and actively participates in the power regulation auxiliary service of voltage regulation, frequency regulation and peak regulation of a receiving-end alternating current power grid.
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