CN111190061A - Energy storage system's test platform - Google Patents
Energy storage system's test platform Download PDFInfo
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- CN111190061A CN111190061A CN201911168567.9A CN201911168567A CN111190061A CN 111190061 A CN111190061 A CN 111190061A CN 201911168567 A CN201911168567 A CN 201911168567A CN 111190061 A CN111190061 A CN 111190061A
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- 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
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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
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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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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
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Abstract
The invention relates to a test platform of an energy storage system, and belongs to the field of electric power energy storage tests. The test platform comprises a first energy storage system, a second energy storage system and a third energy storage system, wherein the first energy storage system comprises a first battery module and a first inverter and is used for simulating an alternating current power grid; the second energy storage system comprises a second battery module and a second inverter and is used for simulating a load; the third energy storage system is an energy storage system to be tested, and the first energy storage system, the second energy storage system and the third energy storage system are connected to the alternating current bus; and the monitoring system is respectively connected with the first energy storage system, the second energy storage system and the third energy storage system in a sampling control mode. The test platform disclosed by the invention is simple in structure, can be built only by two energy storage systems, is low in economic cost, and can ensure the reliable test of the energy storage systems.
Description
Technical Field
The invention relates to a test platform of an energy storage system, and belongs to the field of electric power energy storage tests.
Background
With the development of smart grid technology and the high-proportion access of new energy, the demand of a power grid on an energy storage system is more and more urgent. The energy storage system can change the principle of synchronism of power generation and power utilization, and can realize peak clipping and valley filling, peak and frequency modulation, emergency support, delay of power grid transformation and the like. The flywheel energy storage system has the advantages of long service life, no pollution, high safety and the like, and is suitable for the application field of short-time high-frequency charge and discharge of a power grid.
The electric energy storage is successfully applied to aspects such as power grid frequency modulation, peak shaving, new energy consumption, standby power supply and the like, and before the energy storage system is in operation of hanging a grid, although the existing energy storage grid-connected detection test system can test the energy storage grid-connected detection test system, the system architecture is complex, special equipment is required for supporting, and the economical efficiency is poor.
Disclosure of Invention
The invention aims to provide a test platform of an energy storage system, which is used for solving the problems of complex structure and high economic cost of the existing test platform.
The test platform of the energy storage system adopts the following technical scheme:
the first energy storage system comprises a first battery module and a first inverter and is used for simulating an alternating current power grid;
the second energy storage system comprises a second battery module and a second inverter and is used for simulating a load;
the third energy storage system is an energy storage system to be tested, and the first energy storage system, the second energy storage system and the third energy storage system are all connected to the alternating current bus;
and the monitoring system is respectively connected with the first energy storage system, the second energy storage system and the third energy storage system in a sampling control mode.
The beneficial effects of the above technical scheme are:
the test platform provided by the invention utilizes an energy storage system to simulate an alternating current power grid, then utilizes an energy storage system to simulate a load, the two are realized through a battery module and an inverter and are connected through a test bus (alternating current bus), the energy storage system to be tested is connected onto the test bus, then a control command is issued through a monitoring system, the energy storage system simulating the alternating current power grid and the energy storage system simulating the load are respectively controlled, so that the load fluctuation of the load in the alternating current power grid is simulated, the energy storage system to be tested is further tested, and the test aim is achieved. The test platform disclosed by the invention is simple in structure, can be built only by two energy storage systems, is low in economic cost, and can ensure the reliable test of the energy storage systems.
Further, the third energy storage system is a flywheel energy storage system, and the test platform is particularly suitable for energy storage systems which realize functions of power grid frequency modulation, peak shaving, new energy consumption, standby power supply and the like, such as the flywheel energy storage system, so that the energy storage system to be tested is preferably the flywheel energy storage system.
In order to implement grid connection of the test platform, further, the test platform further comprises:
and the low-voltage side of the transformer is connected with the alternating-current bus, and the high-voltage side of the transformer is used for connecting the power grid incoming line.
The active power test realized by the test platform in the off-grid mode comprises the following steps:
and the monitoring system controls the first energy storage system to work in a V/F mode, controls the active power change of the second energy storage system, determines the active power of the third energy storage system in the load change process, and judges whether the third energy storage system normally operates or not according to the active power of the third energy storage system.
Further, when the active power of the second energy storage system changes, the response speed of the third energy storage system in the charging and discharging process is tested.
The reactive power test realized by the test platform in the off-grid mode comprises the following steps:
and the monitoring system controls the first energy storage system to work in a V/F mode, controls the reactive power change of the second energy storage system, determines the reactive power of the third energy storage system in the load change process, and judges whether the third energy storage system normally operates or not according to the reactive power of the third energy storage system.
Further, when the reactive power of the second energy storage system changes, the response speed of the third energy storage system in the charging and discharging process is tested.
The charging and discharging test realized by the test platform in the grid-connected mode comprises the following steps:
in a grid-connected mode, the first energy storage system and the second energy storage system are controlled to send active power through a control command sent by the monitoring system, the third energy storage system is controlled to absorb the active power, and a charging test of the third energy storage system is completed;
and under the grid-connected mode, the first energy storage system and the second energy storage system are controlled to absorb active power through a control command sent by the monitoring system, the third energy storage system is controlled to send out active power, and the discharge test of the third energy storage system is completed.
Drawings
FIG. 1 is a schematic illustration of a test platform for an energy storage system in an embodiment of the test platform of the present invention;
FIG. 2 is a schematic diagram of a first/second energy storage system in an embodiment of a test platform of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
The test platform of the energy storage system shown in fig. 1 comprises a monitoring system, a first energy storage system and a second energy storage system, wherein the first energy storage system is composed of a first battery module and a first inverter and is used for simulating an alternating current power grid, and the rated power/electric quantity of the first energy storage system is 1MW/2 WMh; the second energy storage system is composed of a second battery module and a second inverter and is used for simulating a load, and the rated power/electric quantity of the second energy storage system is 1MW/1 WMh.
In fig. 1, a first energy storage system is connected to a second energy storage system through a test bus (ac bus), specifically, the test bus is respectively connected to ac sides of a first inverter and a second inverter, a dc side of the first inverter is connected to a first battery module, and a dc side of the second inverter is connected to a second battery module. In addition, the energy storage system to be tested (in fig. 1, a flywheel energy storage array, also called a flywheel energy storage system) is also connected to the test bus, and the energy storage system to be tested is connected to the first energy storage system and the second energy storage system through the test bus respectively. In addition, the test bus is connected with a power grid through a transformer, namely the low-voltage side of the transformer is connected with the test bus, and the high-voltage side of the transformer is connected with the power grid inlet wire, so that a power supply is provided for the test platform to work in a grid-connected mode.
In fig. 1, a monitoring system is respectively in control connection with a first energy storage system, a second energy storage system and an energy storage system to be tested, the monitoring system is also used for detecting and connecting the energy storage system to be tested, and the energy storage system to be tested is tested by controlling the first energy storage system and the second energy storage system and simulating load fluctuation of a load in an alternating current power grid.
In this embodiment, the flywheel energy storage system is used as the energy storage system to be tested, and the system includes the flywheel, the motor, the bearing, the power converter and the vacuum chamber. In this embodiment, the output end of the flywheel energy storage system connected with the test bus is connected with the voltage transformer in parallel, the output end is connected with the current transformer in series, the output end of the voltage transformer and the output end of the current transformer are both connected to the monitoring system, and the monitoring system is used for receiving the current signal and the voltage signal sent by the current transformer and the voltage transformer and judging the parameter state of the flywheel energy storage system.
In this embodiment, flywheel energy storage dabber, inner wall, rotor, stator and shell are provided with corresponding temperature sensor, voltage sensor and current sensor in flywheel energy storage system, according to specific test needs, confirm which kind of state detection module sets up on the relevant position.
In this embodiment, the test performed by the test platform on the flywheel energy storage system is in two working modes, namely, a grid-connected mode and an off-grid mode. In the grid-connected mode, the testing method of the testing platform comprises the following flows:
1) and (3) charging test:
in a grid-connected mode, a charging and discharging curve command sent by a monitoring system is used for controlling a power grid simulator (namely a first energy storage system) and a load simulator (namely a second energy storage system) to respectively send out 800kW active power, the flywheel energy storage system absorbs 1.6MW energy, a charging test is completed, and test data including voltage data, current data and temperature data are recorded.
In the charging test process, the current transformer and the voltage transformer send current signals and voltage signals acquired in real time to the monitoring system, and the monitoring system compares the received voltage signals and current signals with output voltage and output current set by the flywheel energy storage system to judge whether the compared difference is within a reasonable range.
2) And (3) discharge test:
under a grid-connected mode, a power grid simulator and a load simulator are controlled to respectively absorb 800kW active power through a charging and discharging curve command (control command) sent by a monitoring system, a flywheel energy storage system absorbs 1.6MW energy, a discharging test is completed, and test data including voltage data, current data and temperature data are recorded.
Similarly, in the discharging test process, the current transformer and the voltage transformer send current signals and voltage signals acquired in real time to the monitoring system, and the monitoring system compares the received voltage signals and current signals with output voltage and output current set by the flywheel energy storage system to judge whether the compared difference is within a reasonable range.
In the off-network mode, the testing method of the testing platform comprises the following flows:
1) active power test:
under the off-grid condition, the power grid simulator works in a V/F mode (the prior art ensures that the output voltage is in direct proportion to the frequency), and the flywheel energy storage system is kept in a 50MJ energy storage state; and starting the load simulator through a control command sent by the monitoring system, controlling the load simulator to absorb 900kW active power, controlling the power grid simulator to output 900kW active power, and after the load simulator runs for 20s, controlling the power absorbed by the load simulator to linearly drop from 900kW to 500kW for 500mS, and then linearly rise from 500kW to 900kW for 500 mS. And continuously operating for 1 minute according to the rule, and requiring the flywheel energy storage system to output power from a smooth power supply side in the process of load change, so that the dynamic response speed of the flywheel energy storage system is verified on one hand, and the short-time high-frequency active power throughput capacity is verified on the other hand.
The dynamic response speed is the switching speed of the flywheel energy storage system during charging and discharging state switching, and the time from 90% rated power charging (discharging) to 90% rated power discharging (charging) of the system is detected as the charging and discharging switching time according to the requirements of GB 34120-2017.
2) And (3) reactive power testing:
under the off-grid condition, the power grid simulator works in a V/F mode, and the flywheel energy storage system is kept in a 50MJ energy storage state. And starting the load simulator through a control command sent by the monitoring system, so that the load simulator works at the apparent power of 900kVA and the power factor of +0.7 (inductive), controlling the flywheel energy storage system to work at the apparent power of 900kVA and the power factor of-0.7 (capacitive), and outputting 630kW active power by the power grid simulator. After 20s of operation, the power factor absorbed by the load simulator is controlled to linearly decrease from +0.7 to-0.7 for 500mS and then linearly increase from-0.7 to +0.7 for 500 mS. The operation was continued for 1 minute in accordance with this rule. The power factor of the power supply side is required to be smoothed in the process of load change of the flywheel energy storage system, so that the dynamic response speed of the flywheel energy storage system is verified on one hand, and the short-time high-frequency reactive power throughput capacity is verified on the other hand.
In this embodiment, the battery energy storage system for simulating the grid and the load is implemented by using the battery module and the inverter, and as another implementation, a soft start switch KM may be connected in series between the battery module and the inverter, as shown in fig. 2. In addition, the inverter structure in this embodiment is not limited to the inverter in fig. 2, and inverters with other structures in the prior art may also be used, which is not described again.
In this embodiment, the test on the energy storage system to be tested mainly aims to detect whether the energy storage system to be tested can rapidly change the charge and discharge state and change the response speed of the charge and discharge state when the load suddenly changes. It should be further noted that the test platform provided by the invention is not only suitable for flywheel energy storage systems, but also suitable for other energy storage systems which realize the functions of power grid frequency modulation, peak shaving, new energy consumption, standby power supply and the like.
Claims (8)
1. A test platform of an energy storage system, comprising:
the first energy storage system comprises a first battery module and a first inverter and is used for simulating an alternating current power grid;
the second energy storage system comprises a second battery module and a second inverter and is used for simulating a load;
the third energy storage system is an energy storage system to be tested, and the first energy storage system, the second energy storage system and the third energy storage system are all connected to the alternating current bus;
and the monitoring system is respectively connected with the first energy storage system, the second energy storage system and the third energy storage system in a sampling control mode.
2. The test platform of the energy storage system of claim 1, wherein the third energy storage system is a flywheel energy storage system.
3. The energy storage system test platform of claim 1 or 2, further comprising:
and the low-voltage side of the transformer is connected with the alternating-current bus, and the high-voltage side of the transformer is used for connecting the power grid incoming line.
4. The energy storage system test platform according to claim 1 or 2, wherein the active power test implemented by the test platform comprises the following steps:
and the monitoring system controls the first energy storage system to work in a V/F mode, controls the active power change of the second energy storage system, determines the active power of the third energy storage system in the load change process, and judges whether the third energy storage system normally operates or not according to the active power of the third energy storage system.
5. The test platform of the energy storage system according to claim 1 or 2, wherein the reactive power test implemented by the test platform comprises the following steps:
and the monitoring system controls the first energy storage system to work in a V/F mode, controls the reactive power change of the second energy storage system, determines the reactive power of the third energy storage system in the load change process, and judges whether the third energy storage system normally operates or not according to the reactive power of the third energy storage system.
6. The energy storage system test platform of claim 3, wherein the charge and discharge test implemented by the test platform comprises the following steps:
in a grid-connected mode, the first energy storage system and the second energy storage system are controlled to send active power through a control command sent by the monitoring system, the third energy storage system is controlled to absorb the active power, and a charging test of the third energy storage system is completed;
and under the grid-connected mode, the first energy storage system and the second energy storage system are controlled to absorb active power through a control command sent by the monitoring system, the third energy storage system is controlled to send out active power, and the discharge test of the third energy storage system is completed.
7. The energy storage system test platform of claim 4, further comprising the steps of:
and when the active power of the second energy storage system changes, testing the response speed of the third energy storage system in the charging and discharging process.
8. The energy storage system test platform of claim 5, further comprising the steps of:
and when the reactive power of the second energy storage system changes, testing the response speed of the third energy storage system in the charging and discharging process.
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Cited By (3)
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| CN112510734A (en) * | 2021-02-05 | 2021-03-16 | 沈阳微控新能源技术有限公司 | Virtual inertia response offline test system and method based on flywheel energy storage device |
| 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 |
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