CN112510734A - Virtual inertia response offline test system and method based on flywheel energy storage device - Google Patents

Virtual inertia response offline test system and method based on flywheel energy storage device Download PDF

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Publication number
CN112510734A
CN112510734A CN202110157657.9A CN202110157657A CN112510734A CN 112510734 A CN112510734 A CN 112510734A CN 202110157657 A CN202110157657 A CN 202110157657A CN 112510734 A CN112510734 A CN 112510734A
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power grid
flywheel
energy storage
frequency
storage device
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CN202110157657.9A
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CN112510734B (en
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王聪
李海超
程祥
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Shenyang Vycon New Energy Technology Co ltd
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Shenyang Vycon New Energy Technology Co ltd
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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
    • H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • 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
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Engines (AREA)

Abstract

The invention belongs to the technical field of electric power, and discloses a virtual inertia response offline testing system and method based on a flywheel energy storage device, wherein in the system, an engine is used for adjusting the frequency of a power grid upwards according to a power grid disturbance frequency instruction; the programmable resistance box is used for adjusting the power grid frequency downwards according to the power grid disturbance frequency instruction; the energy storage converter is used for alternating current-direct current conversion; the power grid frequency simulation device is respectively connected with the engine, the programmable resistance box, the energy storage converter and the flywheel master control module of the flywheel energy storage device to be tested and is used for detecting power grid parameters, generating a power grid disturbance frequency instruction and a flywheel response trigger instruction according to the power grid parameters, sending the power grid disturbance frequency instruction to the engine or the programmable resistance box and sending the flywheel response trigger instruction to the flywheel master control module. The system and the method can effectively simulate the characteristics of the power grid, do not need grid-connected test, reduce the debugging cost and shorten the debugging time when the on-site grid-connected access is carried out.

Description

Virtual inertia response offline test system and method based on flywheel energy storage device
Technical Field
The invention relates to the technical field of electric power, in particular to a virtual inertia response offline test system and method based on a flywheel energy storage device.
Background
At present, the total installed renewable energy power generation of China is 7.9 hundred million kilowatts, which accounts for 30 percent of the total installed renewable energy power generation of the whole world, and installed capacities of hydropower, wind power and photovoltaic power generation are all the top of the world. More and more intermittent energy sources are connected to the power grid on a large scale, and the randomness of the intermittent energy sources brings new problems to the control of the power grid frequency.
The development of the flywheel energy storage technology provides an available means for relieving the frequency modulation pressure of a power grid, a safe test system is established between a manufacturer and field installation and debugging, the key link is before the flywheel energy storage device is connected into the network to adjust the inertia of the power grid, and the existing test means is mainly used for testing in the power plant.
The actual working condition of a power grid can not be simulated based on a power plant field test mode, only simple charging or discharging tests can be performed, the power grid is easily polluted when the power grid is connected, a large number of unforeseeable factors exist during the tests, a large amount of time and energy can be wasted during field debugging, and the economy is low.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, a first object of the present invention is to provide a flywheel energy storage device-based virtual inertia response offline test system, which can effectively perform power grid characteristic simulation, does not need grid-connected test, reduces debugging cost, and shortens debugging time when on-site grid-connected access.
The invention also provides a virtual inertia response off-line testing method based on the flywheel energy storage device.
In order to achieve the above object, an embodiment of the present invention provides an offline testing system for virtual inertia response based on a flywheel energy storage device, including: the engine is connected with the power grid and used for adjusting the power grid frequency upwards according to the power grid disturbance frequency instruction; the programmable resistance box is connected with a power grid and used for downwards adjusting the frequency of the power grid according to a power grid disturbance frequency instruction; the first end of the energy storage converter is connected with a power grid, and the second end of the energy storage converter is connected with a flywheel energy storage device to be tested and used for alternating current-direct current conversion; and the power grid frequency simulation device is respectively connected with the engine, the programmable resistance box, the energy storage converter and the flywheel master control module of the flywheel energy storage device to be detected and is used for detecting power grid parameters, generating a power grid disturbance frequency instruction and a flywheel response trigger instruction according to the power grid parameters, sending the power grid disturbance frequency instruction to the engine or the programmable resistance box and sending the flywheel response trigger instruction to the flywheel master control module.
According to the virtual inertia response offline test system based on the flywheel energy storage device, the engine, the programmable resistance box, the energy storage converter and the power grid frequency simulation device are arranged to operate in a matched mode, and therefore power grid characteristic simulation can be effectively conducted. When the flywheel energy storage device to be tested is connected to be tested for testing, the power grid frequency simulation device controls the engine or the programmable resistance box to adjust the power grid frequency up or down to the power grid reference frequency, and also controls the flywheel energy storage device to be tested to adjust the power grid frequency to the power grid rated frequency, so that the virtual inertia response offline test of the flywheel energy storage device to be tested is completed. In the whole process, the power grid frequency simulation device can monitor the running state parameters of all parts in real time, so that the test result of the flywheel energy storage device to be tested is judged, faults can be eliminated in advance, and economic loss caused by unpredictable faults during field debugging is reduced. The virtual inertia response offline test system based on the flywheel energy storage device can be arranged on the spot based on manufacturers, and high-cost movement of test equipment can be avoided. The flywheel energy storage device to be tested is subjected to system test before leaving a factory, debugging is convenient to carry out according to a test result, grid-connected test is not needed, on-site grid-connected access debugging time can be shortened during later application, and the construction or reconstruction period of a power plant can be shortened to a certain extent.
In some embodiments of the invention, the grid frequency simulation apparatus comprises: the detection module is used for acquiring the analog signals of the power grid parameters and converting the analog signals into corresponding digital signals; the main control module is connected with the detection module and used for obtaining a reference frequency signal according to the corresponding digital signal; the frequency synthesis module is connected with the main control module and used for synthesizing the reference frequency signal to obtain a power grid disturbance frequency signal; the main control module is further configured to generate a power grid disturbance frequency instruction according to the power grid disturbance frequency signal, send the power grid disturbance frequency instruction to the engine or the programmable resistance box, generate a flywheel response trigger instruction according to the power grid parameter, and send the flywheel response trigger instruction to the flywheel main control module.
In some embodiments of the invention, the detection module comprises: the sensor unit is used for acquiring analog signals of the power grid parameters; and the collector unit is connected with the sensor unit and the main control module and is used for converting the analog signals of the power grid parameters into corresponding digital signals.
In some embodiments of the invention, the grid frequency simulation apparatus further comprises: and the signal amplification module is respectively connected with the frequency synthesis module and the main control module and is used for amplifying the power grid disturbance frequency signal and sending the amplified power grid disturbance frequency signal to the main control module.
In some embodiments of the invention, the grid frequency simulation means further comprises at least one of: the output relay module is respectively connected with the main control module, the engine and the programmable resistance box and is used for controlling the output of the power grid disturbance frequency instruction; and the display module is connected with the main control module and is used for at least displaying the power grid disturbance frequency value.
In some embodiments of the invention, the programmable resistance box comprises: the communication module is connected with the power grid frequency simulation device and used for receiving the power grid disturbance frequency instruction; a main PLC (Programmable Logic Controller) module, configured to generate a power input or removal instruction according to the power grid disturbance frequency instruction; the PLC relay module is connected with the main PLC module and used for sending a relay control instruction according to the power input or cut-off instruction; the relay switch modules are used for being opened or closed according to the relay control instruction, so that the corresponding resistance units are switched into or switched off from a power grid.
In some embodiments of the present invention, the offline test system for virtual inertia response based on a flywheel energy storage device further includes: the display is used for displaying the state information of the power grid frequency simulation device, the engine, the programmable resistance box, the energy storage converter and the flywheel energy storage device to be tested; the display, the power grid frequency simulation device, the engine, the programmable resistance box, the energy storage converter and the flywheel master control module are connected through a Controller Area Network (CAN) bus, wherein when a plurality of nodes initiate communication at the same time, a device with the highest priority in the plurality of nodes preferentially receives and transmits information.
In order to achieve the above object, an offline testing method for virtual inertia response based on a flywheel energy storage device according to an embodiment of a second aspect of the present invention is applied to the offline testing system for virtual inertia response based on a flywheel energy storage device according to any of the above embodiments, and the offline testing method for virtual inertia response based on a flywheel energy storage device includes: responding to a starting instruction, and detecting power grid parameters; generating a power grid disturbance frequency instruction and a flywheel response trigger instruction according to the power grid parameters; and controlling an engine or a programmable resistance box according to the power grid disturbance frequency instruction, and controlling the flywheel energy storage device to be tested according to the flywheel response trigger instruction.
According to the virtual inertia response offline testing method based on the flywheel energy storage device, the programmable resistance box and the engine are controlled to operate, so that the virtual inertia response offline testing system based on the flywheel energy storage device can simulate the actual working condition of a power grid. By controlling the operation of the flywheel energy storage device to be tested, the off-line test of the virtual inertia response of the flywheel energy storage device to be tested can be realized, the grid-connected test is not needed, and the fault can be eliminated in advance, so that the economic loss caused by unpredictable faults during field debugging is reduced.
In some embodiments of the present invention, controlling an engine or a programmable resistance box according to the grid disturbance frequency command, and controlling a flywheel energy storage device to be tested according to the flywheel response trigger command includes: controlling the programmable resistance box to input instantaneous power; monitoring the power grid frequency, sending the flywheel response trigger instruction to a flywheel master control module of the flywheel energy storage device to be tested when the power grid frequency reaches a first preset frequency value, and controlling a flywheel array of the flywheel energy storage device to be tested to discharge; controlling the programmable resistance box to absorb electric energy; and monitoring the frequency of the power grid, sending a discharge stopping instruction to the flywheel master control module when the response time is reached, and controlling the flywheel array to stop discharging.
In some embodiments of the present invention, controlling an engine or a programmable resistance box according to the grid disturbance frequency command, and controlling a flywheel energy storage device to be tested according to the flywheel response trigger command, further includes: when the delay time is reached, sending an engine access instruction to the engine so that the engine can deliver electric energy to the power grid; monitoring the power grid frequency, sending the flywheel response trigger instruction to the flywheel master control module when the power grid frequency reaches a second preset frequency value so as to control the flywheel array to charge; and when the response time is reached, sending a charging stopping instruction to the flywheel master control module so as to control the flywheel array to stop charging.
In some embodiments of the present invention, before controlling an engine or a programmable resistance box according to the grid disturbance frequency command and controlling a flywheel energy storage device to be tested according to the flywheel response trigger command, the offline testing method based on the virtual inertia response of the flywheel energy storage device further includes: controlling an energy storage converter to rectify the power grid alternating voltage signal to obtain a direct voltage signal; and when the direct-current voltage signal reaches a voltage threshold value, controlling the flywheel array to start, and controlling the flywheel array to precharge to a hot standby rotating speed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a flywheel energy storage device based virtual inertia response offline test system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary flywheel energy storage device array under test;
FIG. 3 is a block diagram of a grid frequency simulation apparatus according to an embodiment of the present invention;
fig. 4 is a block diagram of a grid frequency simulation apparatus according to another embodiment of the present invention;
fig. 5 is a block diagram of a grid frequency simulation apparatus according to yet another embodiment of the present invention;
FIG. 6 is a block diagram of a programmable resistance box of one embodiment of the present invention;
FIG. 7 is a block diagram of a flywheel energy storage device based virtual inertia response offline test system according to another embodiment of the present invention;
FIG. 8 is a flowchart of a method for offline testing of virtual inertia response of a flywheel-based energy storage device according to an embodiment of the invention;
FIG. 9 is a flowchart of a method for offline testing virtual inertia response of a flywheel energy storage device according to another embodiment of the present invention;
FIG. 10 is a flowchart of a method for offline testing virtual inertia response of a flywheel energy storage device according to yet another embodiment of the present invention;
FIG. 11 is a flowchart of a method for offline testing virtual inertia response of a flywheel energy storage device according to another embodiment of the present invention.
Reference numerals:
the method comprises the steps that an offline test system 1, a power grid 2 and a flywheel energy storage device 3 to be tested are responded based on virtual inertia of the flywheel energy storage device;
the system comprises an engine 10, a programmable resistance box 20, an energy storage converter 30, a power grid frequency simulation device 40, a display 50 and a flywheel master control module 31;
the system comprises a communication module 201, a main PLC module 202, a PLC relay module 203, a detection module 401, a main control module 402, a frequency synthesis module 403, a signal amplification module 404, an output relay module 405 and a display module 406;
a sensor unit 4011 and a collector unit 4012.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The following describes a virtual inertia response offline test system based on a flywheel energy storage device according to an embodiment of the invention with reference to fig. 1-7.
FIG. 1 is a block diagram of a flywheel energy storage device based virtual inertia response offline test system according to an embodiment of the present invention. As shown in fig. 1, the offline test system 1 based on the virtual inertia response of the flywheel energy storage device at least comprises an engine 10, a programmable resistance box 20, an energy storage converter 30 and a grid frequency simulation device 40.
The engine 10 is connected to the grid 2 and is configured to adjust the grid frequency upward according to the grid disturbance frequency command. The engine 10 responds to the instruction to operate, can generate electric energy and transmits the electric energy to the power grid 2, the power grid disturbance frequency instruction contains power grid reference frequency information, and the engine 10 generates power and adjusts the power grid frequency to the power grid reference frequency.
The programmable resistance box 20 is connected to the grid 2 and is configured to adjust the grid frequency downward according to the grid disturbance frequency command. The programmable resistance box 20 may include a plurality of load resistors, a program is further stored in the programmable resistance box 20, after receiving a power grid disturbance frequency instruction, the internal program runs, and a part of or all of the load resistors may be controlled to work according to the instruction, so as to achieve the purpose of adjusting the power grid frequency to the power grid reference frequency. In the whole test process, the electric energy is consumed through the resistance load, the influence of the violent voltage rise of the power grid 2 in the fluctuation on the test process and the impact on the power grid 2 of a factory can be eliminated, and the system is protected.
The first end of the energy storage converter 30 is connected with the power grid 2, and the second end of the energy storage converter 30 is connected with the flywheel energy storage device 3 to be tested and used for alternating current-direct current conversion. The flywheel energy storage device 3 to be tested is a device to be tested, and the energy storage converter 30 has an alternating current-direct current conversion function, namely, an alternating current signal can be converted into a direct current signal or a direct current signal can be converted into an alternating current signal, so that a direct current voltage signal, a direct current signal, an alternating current voltage signal and an alternating current signal are obtained, and a direct current electric power signal and an alternating current electric power signal are obtained according to the voltage and the current signals.
In the whole test process, the energy storage converter 30 can also be used as a follow-up device of the power grid frequency simulation device 40, the energy storage converter 30 is set to be in a constant direct current voltage mode, and the energy storage converter can absorb electric energy from a power grid transformer or release the electric energy to the power grid transformer adaptively according to the action of the flywheel array so as to stabilize the direct current bus voltage.
The power grid frequency simulation device 40 is respectively connected with the engine 10, the programmable resistance box 20, the energy storage converter 30 and the flywheel master control module 31 of the flywheel energy storage device 3 to be tested, and is used for detecting power grid parameters, generating a power grid disturbance frequency instruction and a flywheel response trigger instruction according to the power grid parameters, sending the power grid disturbance frequency instruction to the engine 10 or the programmable resistance box 20, and sending the flywheel response trigger instruction to the flywheel master control module 31. The power grid parameters include power grid frequency parameters, operation parameters of the flywheel energy storage device 3 to be tested, operation parameters of the programmable resistance box 20, operation parameters of the engine 10 and the like.
In the embodiment of the present invention, the grid frequency simulation device 40 has a parameter detection and control function, and can control the operations of the engine 10, the programmable resistance box 20, the energy storage converter 30 and the flywheel energy storage device 3 to be tested according to the detected grid parameters.
Specifically, the grid disturbance frequency command includes a command for adjusting the grid frequency up and a command for adjusting the grid frequency down. If the command is sent to the engine 10, the engine 10 operates and discharges to the grid 2 to adjust the grid frequency up to the grid reference frequency, or the command is sent to the programmable resistance box 20, and the programmable resistance box 20 can absorb electric energy from the grid 2 during operation to control the grid frequency to adjust down to the grid reference frequency. By controlling the operation of the programmable resistance box 20 and the engine 10, the virtual inertia response offline test system 1 based on the flywheel energy storage device can simulate the actual working condition of the power grid 2.
The flywheel master control module 31 can also control the flywheel energy storage device 3 to be tested to perform charging or discharging or protecting actions according to the flywheel response triggering instruction. For example, the programmable resistance box 20 operates to adjust the power grid frequency below, when the power grid frequency is lower than the power grid rated frequency and exceeds a certain range, the flywheel master control module 31 can control the flywheel energy storage device 3 to be tested to operate, and at this time, the flywheel energy storage device 3 to be tested serves as a power supply to discharge to the power grid 2. For another example, when the engine 10 discharges to the power grid 2 to adjust the power grid frequency, and when the power grid frequency is higher than the power grid rated frequency and exceeds a certain range, the flywheel master control module 31 can control the flywheel energy storage device 3 to be tested to operate, and at this time, the flywheel energy storage device 3 to be tested serves as a load to absorb power from the power grid 2. The operation of the flywheel energy storage device 3 to be tested is controlled, so that the offline test of the virtual inertia response of the flywheel energy storage device 3 to be tested is completed.
In an embodiment, the flywheel energy storage device 3 to be tested further comprises a flywheel array. Fig. 2 is a schematic diagram of a flywheel energy storage device array according to an embodiment of the present invention, where the flywheel array includes a flywheel 1, a flywheel N, and a DC/AC (Direct Current/Alternating Current) conversion unit and KA1, KA3 switch units corresponding to each branch, and a plurality of flywheels form the flywheel array, and the flywheels in the flywheel array can operate simultaneously. The flywheel array is not limited to the arrangement mode, the flywheel array is generally arranged in a container type, for example, the flywheel array can be arranged and tested in a single container, can be arranged and tested in a plurality of containers, and can also be arranged and tested in a single product.
According to the virtual inertia response offline testing system 1 based on the flywheel energy storage device, the engine 10, the programmable resistance box 20, the energy storage converter 30 and the power grid frequency simulation device 40 are arranged to operate in a matched mode, and therefore characteristic simulation of the power grid 2 can be effectively conducted. When the flywheel energy storage device 3 to be tested is connected for testing, the power grid frequency simulation device 40 controls the engine 10 or the programmable resistance box 20 to adjust the power grid frequency up or down to the power grid reference frequency, and also controls the flywheel energy storage device 3 to be tested to adjust the power grid frequency to the power grid rated frequency, so that the virtual inertia response offline test of the flywheel energy storage device 3 to be tested is completed. In the whole process, the power grid frequency simulation device 40 can monitor the running state parameters of each part in real time, so that the test result of the flywheel energy storage device 3 to be tested is judged, the fault can be eliminated in advance, and the economic loss caused by unpredictable faults during field debugging is reduced. The virtual inertia response offline test system 1 based on the flywheel energy storage device can be arranged on the spot based on manufacturers, and high-cost movement of test equipment can be avoided. The flywheel energy storage device 3 to be tested is subjected to system test before leaving a factory, debugging is convenient to carry out according to a test result, grid-connected test is not needed, on-site grid-connected access debugging time can be shortened during later application, and the construction or reconstruction period of a power plant can be shortened to a certain extent.
Fig. 3 is a block diagram of a grid frequency simulation apparatus according to another embodiment of the present invention. As shown in fig. 3, the grid frequency simulation apparatus 40 includes a detection module 401, a main control module 402, and a frequency synthesis module 403.
The detection module 401 is configured to collect analog signals of power grid parameters, and convert the analog signals into corresponding digital signals.
In the embodiment, the detected power grid frequency parameter signal, the operation parameter signal of the flywheel energy storage device 3 to be tested, the operation parameter signal of the programmable resistance box 20, the operation parameter signal of the engine 10, and the like are analog signals. The detection module 401 processes the analog signal to obtain a digital signal containing corresponding parameters, so as to be recognized by the main control module 402.
The main control module 402 is connected to the detection module 401, and is configured to obtain a reference frequency signal according to the corresponding digital signal.
In an embodiment, the main control module 402 receives the processed digital signal and sends a response action command. For example, the master module 402 may be a chip with a program running function, such as an STM32F407 chip, and may provide 24V dc power from a dc power supply, and supply power to the master module 402 after filtering. The main control module 402 stores a main program, and after receiving the signal sent by the detection module 401, the main program runs to obtain a corresponding reference frequency signal according to the received signal. The reference frequency signal comprises a power grid reference frequency value, and the purpose is to adjust the power grid frequency to the power grid reference frequency so as to realize the offline test of the virtual inertia response of the flywheel energy storage device 3 to be tested.
The frequency synthesizing module 403 is connected to the main control module 402, and is configured to synthesize the reference frequency signal to obtain a grid disturbance frequency signal. For example, the frequency synthesis module 403 can receive a signal sent by the main control module 402 and can send the obtained signal to the main control module 402. Wherein, a dc power supply provides 24V dc power, which is filtered to supply power to the frequency synthesis module 403.
For example, the frequency synthesis module 403 may be a processor capable of running a program, such as an AD995X processor. The frequency synthesis module 403 stores a program, and after receiving the reference frequency signal sent by the main control module 402, the frequency synthesis module 403 runs the stored program to synthesize the frequency to obtain a corresponding power grid disturbance frequency signal.
The main control module 402 is further configured to generate a power grid disturbance frequency instruction according to the power grid disturbance frequency signal, send the power grid disturbance frequency instruction to the engine 10 or the programmable resistance box 20, generate a flywheel response trigger instruction according to the power grid parameter, and send the flywheel response trigger instruction to the flywheel main control module 31.
In the embodiment of the present invention, the frequency synthesis module 403 sends the obtained power grid disturbance frequency signal to the main control module 402, and a main program in the main control module 402 runs and performs simulation calculation according to the power grid disturbance frequency signal to generate a power grid disturbance frequency instruction. The power grid frequency disturbance instruction includes a preset power grid reference frequency value, the main control module 402 sends the power grid frequency disturbance instruction to the engine 10, and the engine 10 discharges to the power grid 2 during operation to adjust the power grid frequency up to the power grid reference frequency. Alternatively, the main control module 402 sends the grid frequency disturbance instruction to the programmable resistance box 20, and the programmable resistance box 20 can absorb electric energy from the grid 2 during operation, so as to control the grid frequency to be adjusted to the grid reference frequency.
The main control module 402 can also generate a flywheel response trigger instruction according to the power grid parameters, the flywheel response trigger instruction is received and responded by the flywheel main control module 31, and when the variation of the power grid frequency exceeds the frequency control dead zone threshold range, such as ± 0.05Hz, the flywheel main control module 31 controls the running of the flywheel energy storage device 3 to be tested, so as to adjust the power grid frequency to the power grid rated frequency. For example, when the engine 10 is operated to discharge to the grid, the grid frequency gradually increases, and when the grid frequency exceeds the frequency control dead zone, the flywheel energy storage device 3 is operated to charge from the grid 2, the dc bus voltage decreases, and the energy storage converter 30 absorbs electric energy from the grid transformer side, thereby controlling the grid frequency to decrease to the grid rated frequency. When the programmable resistance box 20 operates to adjust the power grid frequency downwards, and the power grid frequency exceeds the frequency control dead zone, the flywheel energy storage device 3 operates to discharge to the power grid 2, the voltage of the direct-current bus rises, the energy storage converter 30 releases electric energy to the side of the power grid transformer, so that the power grid frequency is controlled to rise to the power grid rated frequency, and the virtual inertia response offline test of the flywheel energy storage device 3 to be tested is completed.
Fig. 4 is a block diagram of a grid frequency simulation apparatus according to another embodiment of the present invention. As shown in fig. 4, the detection module 401 includes a sensor unit 4011 and a collector unit 4012.
The sensor unit 4011 is configured to collect analog signals of the grid parameters. The sensor unit 4011 can acquire parameters such as a power grid frequency parameter, an operation parameter of the flywheel energy storage device 3 to be measured, an operation parameter of the programmable resistance box 20, an operation parameter of the engine 10 and the like in real time, and send the acquired analog signal to the collector unit 4012.
The collector unit 4012 is connected to the sensor unit 4011 and the main control module 402, and is configured to convert the analog signals of the power grid parameters into corresponding digital signals. The digital signals can participate in the operation of the main program in the main control module 402, and the collector unit 4012 processes the received analog signals to generate corresponding digital signals, and transmits the digital signals to the main control module 402 for calculation.
Fig. 5 is a block diagram of a grid frequency simulation apparatus according to yet another embodiment of the present invention. As shown in fig. 5, the grid frequency simulation apparatus 40 further includes a signal amplification module 404. The signal amplification module 404 is connected to the frequency synthesis module 403 and the main control module 402, and is configured to amplify the power grid disturbance frequency signal and send the amplified power grid disturbance frequency signal to the main control module 402.
In the embodiment of the present invention, the frequency synthesis module 403 performs frequency synthesis on the reference frequency signal, and the grid disturbance frequency signal obtained by the frequency synthesis is an analog signal. The signal amplification module 404 is configured to amplify the power grid disturbance frequency signal, convert the power grid disturbance frequency signal into a digital signal, and send the digital signal to the main control module 402 for processing.
In one embodiment of the present invention, as shown in fig. 5, the grid frequency simulation apparatus 40 further includes at least one of an output relay module 405 and a display module 406.
The output relay module 405 is connected to the main control module 402, the engine 10, and the programmable resistance box 20, respectively, and is configured to control output of a grid disturbance frequency instruction. The output relay module 405 controls the operation of an external execution module such as the engine 10 or the programmable resistance box 20, and controls the remote operation of the low voltage protection cabinet by controlling the output of the grid disturbance frequency command, wherein the low voltage protection cabinet can protect the whole system when the whole system is overloaded or short-circuited.
The display module 406 is connected to the main control module 402, and is configured to display at least the grid disturbance frequency value. The display module 406 may be a display with a touch function, and may display related parameters including a power grid disturbance frequency value, and an operator may also directly send an instruction through the touch display to implement functions such as parameter setting or downloading, which is convenient for operation.
FIG. 6 is a block diagram of a programmable resistance box according to one embodiment of the present invention. As shown in fig. 6, the programmable resistance box 20 includes a communication module 201, a master PLC module 202, and a PLC relay module 203.
The communication module 201 is connected to the grid frequency simulation apparatus 40, and is configured to receive a grid disturbance frequency command.
In an embodiment, when the grid frequency needs to be reduced, the grid frequency simulation device 40 sends the grid disturbance frequency instruction to the programmable resistance box 20, and the communication module 201 receives the grid disturbance frequency instruction, and the communication module 201 sends the received grid disturbance frequency instruction to the master PLC module 202.
The master PLC module 202 is configured to generate a power input or removal command according to the grid disturbance frequency command. The master PLC module 202 may include a chip, such as an S7-400 chip, in which a program is stored, and when the program runs, the program can perform multi-power combination input or removal according to the power grid disturbance frequency instruction, and generate a power input or removal instruction, and control all or a certain number of load units to work, so as to down-regulate the power grid frequency to the power grid reference frequency.
The PLC relay module 203 is connected to the main PLC module 202, and is configured to issue a relay control instruction according to a power input or removal instruction. The relay control command comprises a relay on or off command. When the main PLC module 202 sends a power input command, a certain number or all of the load units work, and the PLC relay module 203 cooperates with the main PLC module 202 to send a relay control command to control the on/off of the corresponding relay switch module. For example, the relay of the branch where the load unit that needs to work is located is controlled to be turned on, or the relay of the branch where the load unit that does not need to work is controlled to be turned off, so that the grid frequency is adjusted to the grid reference frequency.
In an embodiment, the programmable resistance box 20 further includes a plurality of relay switch modules and a plurality of corresponding connected resistance units, and the plurality of relay switch modules are configured to be opened or closed according to the relay control instruction, so that the corresponding resistance units are switched into the power grid 2 or switched out of the power grid 2. As shown in FIG. 6, the plurality of relay switch modules may include relays KA1-KAN, each relay connected in series with one of the resistor units of the branch, each resistor unit including one or more load resistors. For example, the load resistor may be combined by resistor units with a minimum frequency of 5kW, the material may be stainless steel, which has good corrosion resistance, no oxide layer formation and no cracking under high temperature conditions, good heat storage capacity, so that the programmable resistance box 20 can operate for a long time and at a high frequency, and is not easy to damage and economical.
FIG. 7 is a block diagram of an offline test system for virtual inertia response based on flywheel energy storage devices, according to yet another embodiment of the present invention. As shown in FIG. 7, the offline test system 1 further includes a display 50 based on the virtual inertia response of the flywheel energy storage device. The display 50 is configured to display status information of the grid frequency simulation apparatus 40, the engine 10, the programmable resistance box 20, the energy storage converter 30, and the flywheel energy storage device 3 to be tested, such as an operating parameter of the flywheel energy storage device 3 to be tested. The display 50 is connected with a test computer of the flywheel energy storage device-based virtual inertia response offline test system 1, and an operator controls the display 50 to display the running state parameters of different modules or perform data query and the like by operating the test computer.
The display 50, the grid frequency simulation device 40, the engine 10, the programmable resistance box 20, the energy storage converter 30 and the flywheel master control module 31 are connected through a Controller Area Network (CAN) bus, wherein when a plurality of nodes on the CAN bus initiate communication simultaneously, a device with the highest priority among the plurality of nodes preferentially receives and transmits information.
In the embodiment of the present invention, the display 50, the grid frequency simulation device 40, the engine 10, the programmable resistance box 20, the energy storage converter 30, and the flywheel master control module 31 may be on a CAN bus, and the transmission medium of the CAN bus may be a twisted pair cable or a coaxial cable. The modules initiate communication from multiple nodes simultaneously, so that data communication has no master-slave distinction, and any one node can initiate data communication to any other node(s). When a plurality of nodes initiate communication simultaneously, the avoidance priority with low communication priority is high, for example, the communication order is determined by the priority order of the information of each node, and the information of the node with high priority is 134 mus, so that the communication line is not congested. The communication distance can be as far as 10KM, the communication speed is lower than 5Kbps, the communication speed can be as high as 1Mbps, and the communication distance is less than 40M.
Fig. 8 is a flowchart illustrating a method for offline testing a virtual inertia response of a flywheel energy storage device according to an embodiment of the present invention. The offline testing method for the virtual inertia response of the flywheel energy storage device is used in the offline testing system for the virtual inertia response of the flywheel energy storage device in any one of the above embodiments, and at least includes steps S1-S3, which are as follows.
And S1, responding to the starting command, and detecting the power grid parameters. The power grid parameters are acquired in real time by a detection module in the power grid frequency simulation device, wherein the power grid parameters comprise power grid frequency parameters, operating parameters of the flywheel energy storage device to be detected, operating parameters of the programmable resistance box, operating parameters of the engine and the like.
And S2, generating a power grid disturbance frequency command and a flywheel response trigger command according to the power grid parameters.
In the embodiment, the main control module obtains a reference frequency signal according to the power grid parameters, the frequency synthesis module performs frequency synthesis according to the reference frequency signal to obtain a power grid disturbance frequency signal, the power grid disturbance frequency signal is sent to the main control module again, and the main control module generates a power grid disturbance frequency instruction according to the power grid disturbance frequency signal. And the main control module also generates a flywheel response trigger instruction according to the power grid disturbance frequency signal.
And S3, controlling the engine or the programmable resistance box according to the power grid disturbance frequency instruction, and controlling the flywheel energy storage device to be tested according to the flywheel response triggering instruction.
In the embodiment of the invention, when the engine responds to the power grid disturbance frequency instruction and adjusts the power grid frequency upwards to the power grid reference frequency, the flywheel master control module responds to the flywheel response trigger instruction to control the flywheel energy storage device to be tested to operate and adjust the power grid frequency downwards to the power grid rated frequency. When the programmable resistance box responds to the power grid disturbance frequency instruction, the power grid frequency is adjusted downwards to the power grid reference frequency, the flywheel responds to the trigger instruction to control the flywheel energy storage device to be tested to operate, and the power grid frequency is adjusted upwards to the power grid rated frequency.
According to the virtual inertia response offline testing method based on the flywheel energy storage device, the programmable resistance box and the engine are controlled to operate, so that the virtual inertia response offline testing system based on the flywheel energy storage device can simulate the actual working condition of a power grid. By controlling the operation of the flywheel energy storage device to be tested, the off-line test of the virtual inertia response of the flywheel energy storage device to be tested can be realized, the grid-connected test is not needed, and the fault can be eliminated in advance, so that the economic loss caused by unpredictable faults during field debugging is reduced.
FIG. 9 is a flowchart of an offline testing method for virtual inertia response based on a flywheel energy storage device according to another embodiment of the invention. As shown in fig. 9, the step S3 at least includes steps S301 to S304, which are as follows.
And S301, controlling the programmable resistance box to input instantaneous power.
In an embodiment, when a power grid disturbance frequency instruction sent by a main control module in the power grid frequency simulation device is an instruction for reducing the power grid frequency, the programmable resistance box inputs instantaneous power, for example, the programmable resistance box controls the conduction of part or all of the relay switch modules according to the instruction, so that the correspondingly connected resistance units work, and the reduction of the power grid frequency is realized.
S302, monitoring the power grid frequency, sending a flywheel response trigger instruction to a flywheel master control module of the flywheel energy storage device to be tested when the power grid frequency reaches a first preset frequency value, and controlling a flywheel array of the flywheel energy storage device to be tested to discharge.
In an embodiment, the first preset frequency value may be a frequency value less than 0.05Hz of the rated frequency of the power grid. For example, if the nominal frequency of the power grid is 50Hz, the first preset frequency value may be 49.95 Hz. The power grid frequency simulation device monitors power grid frequency parameters in real time, when the power grid frequency is lower than 49.95Hz, a flywheel response trigger instruction is sent, the flywheel master control module receives the instruction and controls the flywheel array to operate, and the flywheel array discharges to the power grid according to the received power requirement, so that the power grid frequency is controlled to rise.
And S303, controlling the programmable resistance box to absorb electric energy. And the load resistor in the programmable resistor box is continuously electrified, so that power is continuously absorbed from the power grid, and electric energy is consumed.
And S304, monitoring the power grid frequency, reaching the response time, and sending a discharge stopping instruction to the flywheel master control module to control the flywheel array to stop discharging.
In the embodiment, the power grid frequency simulation device monitors the power grid frequency parameter in real time and records time, after the power grid frequency is adjusted to the power grid rated frequency and response time is reached, the main control module sends a discharge stopping instruction to the flywheel main control module, and the flywheel main control module controls the flywheel array to stop working and enter a standby state, so that discharge to the power grid is completed.
FIG. 10 is a flowchart of a method for offline testing a virtual inertia response of a flywheel-based energy storage device according to another embodiment of the invention. As shown in fig. 10, the step S3 at least includes steps S305 to S307, which are as follows.
And S305, sending an engine access instruction to the engine when the delay time is reached so that the engine can deliver electric energy to the power grid.
In the embodiment, the flywheel energy storage system is controlled to work to adjust the power grid frequency to the power grid rated frequency, the flywheel array stops working and enters a standby state, the delay time is preset, after the delay time is reached, the power grid frequency simulation device sends a power grid disturbance frequency instruction to the engine, the power grid disturbance frequency instruction is an engine access instruction, and the engine runs to deliver electric energy to the power grid so as to raise the power grid frequency.
And S306, monitoring the power grid frequency, sending a flywheel response trigger instruction to the flywheel master control module when the power grid frequency reaches a second preset frequency value, and controlling the flywheel array to charge.
In an embodiment, the second preset frequency value may be a frequency value greater than 0.05Hz of the rated frequency of the power grid. For example, the rated frequency of the power grid is 50Hz, and the first preset frequency value is 50.05 Hz. The power grid frequency simulation device monitors power grid frequency parameters in real time, when the power grid frequency is higher than 50.05Hz, a flywheel response trigger instruction is sent, the flywheel master control module receives the instruction and controls the flywheel array to operate, and the flywheel array charges from a power grid according to the received power requirement, so that the power grid frequency is controlled to be reduced.
And S307, when the response time is reached, sending a charging stopping instruction to the flywheel master control module to control the flywheel array to stop charging.
In the embodiment, the power grid frequency simulation device monitors the power grid frequency parameters in real time and records time, the main control module sends a discharge stopping instruction to the flywheel main control module after the power grid frequency is reduced to the power grid rated frequency and response time is reached, and the flywheel main control module controls the flywheel array to stop working and enter a standby state, so that the charging from the power grid is completed.
In the whole test process, the power grid frequency simulation device monitors the power grid frequency parameters in real time and makes judgment according to fluctuation changes of the power grid parameters. And after one round of detection is finished on the flywheel energy storage device to be detected, judging whether to enter the next round of detection according to the power grid frequency parameters, and if the flywheel energy storage device to be detected is qualified, determining that the next round of detection is not needed, and turning off the power grid frequency simulation device. If it is determined that the flywheel energy storage device to be detected needs to be detected again, after a certain delay time, the power grid frequency simulation device performs a new round of detection again according to the virtual inertia response offline test method based on the flywheel energy storage device in the above embodiment.
FIG. 11 is a flowchart of a method for offline testing a virtual inertia response of a flywheel-based energy storage device according to another embodiment of the invention. As shown in fig. 11, before controlling the engine or the programmable resistance box according to the grid disturbance frequency command and controlling the flywheel energy storage device to be tested according to the flywheel response triggering command, the method for testing the virtual inertia response offline based on the flywheel energy storage device further includes steps S01-S02, which are described in detail below.
And S01, controlling the energy storage converter to rectify the power grid alternating current voltage signal so as to obtain a direct current voltage signal.
In an embodiment, before the grid frequency simulation device controls the engine or the programmable resistance box to work, the energy storage converter acquires a grid alternating-current voltage signal and converts the grid alternating-current voltage signal into a direct-current voltage signal, and can also acquire a direct-current signal and a direct-current power signal. Therefore, when the flywheel energy storage device to be detected is detected later, the flywheel energy storage device to be detected can absorb electric energy from the power grid transformer or release the electric energy to the power grid transformer in an adaptive manner according to the change of the direct current bus voltage so as to stabilize the direct current bus voltage.
And S02, when the direct current voltage signal reaches a voltage threshold value, controlling the flywheel array to start, and controlling the flywheel array to precharge to a hot standby rotating speed.
In the embodiment of the invention, after the system is powered on, the detection module detects a direct current voltage signal, the main control module determines that the direct current voltage signal reaches a preset voltage threshold, and before the flywheel array works to charge or discharge the power grid, the flywheel array is started and precharged to a hot standby rotating speed to wait for driving, so that after the flywheel main control module receives a flywheel response trigger instruction, the flywheel array can be driven quickly, the reaction time can be shortened, and the purpose of quickly adjusting the power grid frequency to the power grid rated frequency can be realized.
In summary, the virtual inertia response offline test system based on the flywheel energy storage device according to the embodiment of the present invention can effectively perform the characteristic simulation of the power grid 2 by setting the engine 10, the programmable resistance box 20, the energy storage converter 30, and the power grid frequency simulation device 40 to operate in cooperation. The fault can be eliminated in advance according to the test result of the flywheel energy storage device 3 to be tested, so that the economic loss caused by unpredictable faults during field debugging is reduced. The virtual inertia response offline test system 1 based on the flywheel energy storage device can be arranged on the spot based on manufacturers, and high-cost movement of test equipment can be avoided. The flywheel energy storage device 3 to be tested is subjected to system test before leaving a factory, debugging is convenient to carry out according to a test result, grid-connected test is not needed, on-site grid-connected access debugging time can be shortened during later application, and the construction or reconstruction period of a power plant can be shortened to a certain extent.
It should be noted that the terms "first" and "second" in the description of the present specification are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A virtual inertia response offline testing system based on a flywheel energy storage device is characterized by comprising:
the engine is connected with the power grid and used for adjusting the power grid frequency upwards according to the power grid disturbance frequency instruction;
the programmable resistance box is connected with a power grid and used for downwards adjusting the frequency of the power grid according to a power grid disturbance frequency instruction;
the first end of the energy storage converter is connected with a power grid, and the second end of the energy storage converter is connected with a flywheel energy storage device to be tested and used for alternating current-direct current conversion;
and the power grid frequency simulation device is respectively connected with the engine, the programmable resistance box, the energy storage converter and the flywheel master control module of the flywheel energy storage device to be detected and is used for detecting power grid parameters, generating a power grid disturbance frequency instruction and a flywheel response trigger instruction according to the power grid parameters, sending the power grid disturbance frequency instruction to the engine or the programmable resistance box and sending the flywheel response trigger instruction to the flywheel master control module.
2. The flywheel energy storage device-based virtual inertia response offline testing system of claim 1, wherein the grid frequency simulation means comprises:
the detection module is used for acquiring the analog signals of the power grid parameters and converting the analog signals into corresponding digital signals;
the main control module is connected with the detection module and used for obtaining a reference frequency signal according to the corresponding digital signal;
the frequency synthesis module is connected with the main control module and used for synthesizing the reference frequency signal to obtain a power grid disturbance frequency signal;
the main control module is further configured to generate a power grid disturbance frequency instruction according to the power grid disturbance frequency signal, send the power grid disturbance frequency instruction to the engine or the programmable resistance box, generate a flywheel response trigger instruction according to the power grid parameter, and send the flywheel response trigger instruction to the flywheel main control module.
3. The flywheel energy storage device based virtual inertia response offline test system of claim 2, wherein the detection module comprises:
the sensor unit is used for acquiring analog signals of the power grid parameters;
and the collector unit is connected with the sensor unit and the main control module and is used for converting the analog signals of the power grid parameters into corresponding digital signals.
4. The flywheel energy storage device-based virtual inertia response offline testing system of claim 2, wherein the grid frequency simulation apparatus further comprises:
and the signal amplification module is respectively connected with the frequency synthesis module and the main control module and is used for amplifying the power grid disturbance frequency signal and sending the amplified power grid disturbance frequency signal to the main control module.
5. The flywheel energy storage device based virtual inertia response offline test system of claim 2, wherein the grid frequency simulation means further comprises at least one of:
the output relay module is respectively connected with the main control module, the engine and the programmable resistance box and is used for controlling the output of the power grid disturbance frequency instruction;
and the display module is connected with the main control module and is used for at least displaying the power grid disturbance frequency value.
6. The flywheel energy storage device-based virtual inertia response offline test system of claim 1, wherein the programmable resistance box comprises:
the communication module is connected with the power grid frequency simulation device and used for receiving the power grid disturbance frequency instruction;
the main PLC module is used for generating a power input or removal instruction according to the power grid disturbance frequency instruction;
the PLC relay module is connected with the main PLC module and used for sending a relay control instruction according to the power input or cut-off instruction;
the relay switch modules are used for being opened or closed according to the relay control instruction, so that the corresponding resistance units are switched into or switched off from a power grid.
7. The flywheel energy storage device-based virtual inertia response offline testing system of claim 1, further comprising:
the display is used for displaying the state information of the power grid frequency simulation device, the engine, the programmable resistance box, the energy storage converter and the flywheel energy storage device to be tested;
the display, the power grid frequency simulation device, the engine, the programmable resistance box, the energy storage converter and the flywheel master control module are connected through a CAN bus, wherein when multiple nodes initiate communication simultaneously, a device with the highest priority in the multiple nodes preferentially receives and transmits information.
8. An offline testing method for virtual inertia response based on a flywheel energy storage device, which is used in the offline testing system for virtual inertia response based on a flywheel energy storage device as claimed in any one of claims 1 to 7, and the offline testing method for virtual inertia response based on a flywheel energy storage device comprises:
responding to a starting instruction, and detecting power grid parameters;
generating a power grid disturbance frequency instruction and a flywheel response trigger instruction according to the power grid parameters;
and controlling an engine or a programmable resistance box according to the power grid disturbance frequency instruction, and controlling the flywheel energy storage device to be tested according to the flywheel response trigger instruction.
9. The virtual inertia response offline testing method of claim 8, wherein controlling an engine or a programmable resistance box according to the grid disturbance frequency command and controlling a flywheel energy storage device under test according to the flywheel response triggering command comprises:
controlling the programmable resistance box to input instantaneous power;
monitoring the power grid frequency, sending the flywheel response trigger instruction to a flywheel master control module of the flywheel energy storage device to be tested when the power grid frequency reaches a first preset frequency value, and controlling a flywheel array of the flywheel energy storage device to be tested to discharge;
controlling the programmable resistance box to absorb electric energy;
and monitoring the frequency of the power grid, sending a discharge stopping instruction to the flywheel master control module when the response time is reached, and controlling the flywheel array to stop discharging.
10. The virtual inertia response offline testing method of claim 9, wherein an engine or a programmable resistance box is controlled according to the grid disturbance frequency command, and a flywheel energy storage device to be tested is controlled according to the flywheel response triggering command, further comprising:
when the delay time is reached, sending an engine access instruction to the engine so that the engine can deliver electric energy to the power grid;
monitoring the power grid frequency, sending the flywheel response trigger instruction to the flywheel master control module when the power grid frequency reaches a second preset frequency value so as to control the flywheel array to charge;
and when the response time is reached, sending a charging stopping instruction to the flywheel master control module so as to control the flywheel array to stop charging.
11. The virtual inertia response offline test method of claim 8, wherein before controlling an engine or a programmable resistance box according to the grid disturbance frequency command and controlling the flywheel energy storage device under test according to the flywheel response triggering command, the virtual inertia response offline test method based on the flywheel energy storage device further comprises:
controlling an energy storage converter to rectify the power grid alternating voltage signal to obtain a direct voltage signal;
and when the direct-current voltage signal reaches a voltage threshold value, controlling the flywheel array to start, and controlling the flywheel array to precharge to a hot standby rotating speed.
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CN211905539U (en) * 2019-12-20 2020-11-10 广州智光电气技术有限公司 Energy storage system primary frequency modulation electric wire netting testing arrangement
CN111896833A (en) * 2020-08-05 2020-11-06 贵州电网有限责任公司 Offline real-time dynamic frequency response test method

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CN113007039A (en) * 2021-03-18 2021-06-22 南方电网科学研究院有限责任公司 Wind power plant inertia response testing method and device
CN113007039B (en) * 2021-03-18 2022-06-14 南方电网科学研究院有限责任公司 Wind power plant inertia response testing method and device
CN112803453A (en) * 2021-03-29 2021-05-14 沈阳微控新能源技术有限公司 Flywheel energy storage system, control method of flywheel energy storage system and storage medium
CN113589076A (en) * 2021-07-23 2021-11-02 西门子（中国）有限公司 Method for simulating motor load in flywheel energy storage and computer readable medium
CN113589076B (en) * 2021-07-23 2024-04-02 西门子（中国）有限公司 Simulation method and computer readable medium for motor load in flywheel energy storage
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