CN111025057B - Energy storage PCS test platform - Google Patents
Energy storage PCS test platform Download PDFInfo
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- CN111025057B CN111025057B CN201911242848.4A CN201911242848A CN111025057B CN 111025057 B CN111025057 B CN 111025057B CN 201911242848 A CN201911242848 A CN 201911242848A CN 111025057 B CN111025057 B CN 111025057B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 122
- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000007600 charging Methods 0.000 claims description 11
- 239000013589 supplement Substances 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000010277 constant-current charging Methods 0.000 claims description 2
- 101150003196 PCS1 gene Proteins 0.000 description 18
- 101100493726 Phalaenopsis sp. BIBSY212 gene Proteins 0.000 description 18
- 101100030895 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPT4 gene Proteins 0.000 description 18
- 101150071172 PCS2 gene Proteins 0.000 description 17
- 101100028908 Lotus japonicus PCS3 gene Proteins 0.000 description 16
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
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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
- H02J3/32—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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention relates to an energy storage PCS test platform, and belongs to the field of power electronic control. The test platform comprises a first energy storage PCS to be tested and a second energy storage PCS to be tested; the alternating current side of the first energy storage PCS to be tested is connected with the alternating current side of the second energy storage PCS to be tested, and the direct current side of the first energy storage PCS to be tested is connected with the direct current side of the second energy storage PCS to be tested; and a common connection point is arranged between the direct current side of the first energy storage PCS to be tested and the direct current side of the second energy storage PCS to be tested, and the common connection point is connected with a direct current source. According to the invention, the alternating current sides of two PCS to be tested are connected, and the direct current sides are connected, so that a closed loop is formed; through the mode of connecting the direct current source at the direct current side, the direct connection between the two energy storage PCS to be tested and the power grid is avoided, and the problem that fault current is introduced into the power grid in the test process of the two energy storage PCS to be tested is solved.
Description
Technical Field
The invention relates to an energy storage PCS test platform, and belongs to the field of power electronic control.
Background
The energy storage converter (Power Conversion System, PCS) can control the charging and discharging processes of the Power battery, perform ac/dc Conversion and directly supply Power to the load without a Power grid. The performance of the PCS, which is an important power conversion device in an energy storage product, directly affects the system performance and reliability of the energy storage product, and may even have an important impact on the cycle life of the energy storage product (e.g., an energy storage battery). It is critical to evaluate the performance of the PCS and to verify the reliability of the PCS, for which extensive testing of the PCS is required.
Chinese patent application publication No. CN109061338A discloses an energy storage PCS drag test platform and method, as shown in fig. 1, two groups of PCS are connected in series to form a closed-loop energy storage PCS system, and under the condition that the ac sides of the two groups of PCS are connected to the power grid, the charging and discharging control module adjusts the dc parameters of the two groups of energy storage PCS to simulate the charging and discharging operating conditions of the battery, thereby implementing a drag test between the two groups of energy storage PCS.
However, for the energy storage PCS split-towing test platform, if the PCS fails during testing, which results in loss of protection function of the PCS, fault current is easily introduced into the power grid through the faulty PCS, which causes actions of the power grid protection equipment, causes power failure accidents, and may affect normal production and work of the plant.
Disclosure of Invention
The invention aims to provide an energy storage PCS test platform to solve the problem that fault current is introduced into a power grid when the PCS is tested in the prior art.
In order to achieve the purpose, the invention provides an energy storage PCS test platform which comprises a first energy storage PCS to be tested and a second energy storage PCS to be tested; the alternating current side of the first energy storage PCS to be tested is connected with the alternating current side of the second energy storage PCS to be tested, and the direct current side of the first energy storage PCS to be tested is connected with the direct current side of the second energy storage PCS to be tested; and a common connection point is arranged between the direct current side of the first energy storage PCS to be tested and the direct current side of the second energy storage PCS to be tested, and the common connection point is connected with a direct current source.
The beneficial effects are that: according to the invention, the alternating current sides of two PCS to be tested are connected, and the direct current sides are connected to form a closed loop; through the mode of connecting the direct current source at the direct current side, the direct connection between the two energy storage PCS to be tested and the power grid is avoided, and the problem that fault current is introduced into the power grid in the test process of the two energy storage PCS to be tested is solved.
Further, the direct current source is a battery/capacitor energy storage device.
Further, a first switch is arranged between the battery/capacitor energy storage device and the common connection point.
Furthermore, the public connection point is further connected with a third test energy storage PCS, the direct current side of the third test energy storage PCS is connected with the public connection point, and the alternating current side of the third test energy storage PCS is connected with a power grid.
The beneficial effects are that: the energy storage device and the test PCS can be jointly used as a direct current source to provide power supplement, and the energy storage device and the test PCS have the advantages of high power supplement speed and high power supplement capacity.
Furthermore, a circuit breaker and a disconnecting switch are arranged between the alternating current side of the first energy storage PCS to be tested and the alternating current side of the second energy storage PCS to be tested.
The beneficial effects are that: when overcurrent or short-circuit faults occur on the alternating current sides of the first energy storage PCS to be tested and the second energy storage PCS to be tested, the circuit breaker can realize overcurrent protection and short-circuit protection functions, and the isolating switch provides obvious breakpoints, so that the circuit breaker is convenient to overhaul and maintain.
Furthermore, a first reactor is arranged between the direct current side of the first energy storage PCS to be tested and the public connection point, and a second reactor is arranged between the direct current side of the second energy storage PCS to be tested and the public connection point.
Further, the direct current source is a third test energy storage PCS, and an alternating current side of the third test energy storage PCS is connected with a power grid.
The beneficial effects are that: when the test PCS serves as a direct-current source to provide power supplement, the test PCS can prevent fault current from being introduced into a power grid even if the PCS to be tested has a fault due to the known performance and the good function of the test PCS, and therefore the problem that the fault current is introduced into the power grid in the test process can be solved.
Furthermore, the alternating current side of the third test energy storage PCS is connected with a power grid through a second switch.
Furthermore, a circuit breaker and a disconnecting switch are arranged between the alternating current side of the first energy storage PCS to be tested and the alternating current side of the second energy storage PCS to be tested.
Further, a first reactor is arranged between the direct current side of the first energy storage PCS to be tested and the common connection point, and a second reactor is arranged between the direct current side of the second energy storage PCS to be tested and the common connection point.
Drawings
FIG. 1 is a schematic diagram of a PCS drag-and-drop test platform in the prior art;
fig. 2 is a schematic diagram of an energy storage PCS test platform according to an embodiment of the invention.
Detailed Description
Energy storage PCS test platform embodiment:
the energy storage PCS test platform, namely the energy storage PCS test system, of the embodiment comprises a PCS to be tested and auxiliary components (such as a switch, a power supply, an industrial personal computer and the like) for testing.
As shown in fig. 2, the energy storage PCS test platform of the present embodiment includes a first energy storage PCS (i.e., PCS1), a second energy storage PCS (i.e., PCS2), and a third energy storage PCS (i.e., PCS3), where PCS1 and PCS2 are PCS to be tested, and their performances are unknown; PCS3 is a test PCS whose performance is known and functional.
The alternating current sides of the PCS1 and the PCS2 are directly connected with a group of circuit breakers QF1 through a group of isolating switches QS1, the alternating current sides are not connected with a power grid, when an overcurrent or short-circuit fault occurs on the alternating current sides, the circuit breakers QF1 can achieve overcurrent protection and short-circuit protection functions, and the isolating switches QS1 can provide obvious breakpoints, so that overhaul and maintenance are facilitated.
The direct current sides of the PCS1 and the PCS2 are connected with each other through the reactor 1 and the reactor 2 respectively, and the reactors are arranged in a loop in series, so that sudden current change can be prevented, and equipment failure or damage can be avoided.
Therefore, based on the connection relationship between the PCS1 and the PCS2, an off-grid closed loop is formed, and energy can flow between the PCS1 and the PCS 2.
In order to provide voltage support for PCS1 and PCS2 during a drag test, a common connection point between the dc side of PCS1 and the dc side of PCS2 is further connected to an energy storage device through a breaker QF3, and the energy storage device in this embodiment may be a battery or a capacitor. Due to the limited capacity of the battery or the capacitor, and in order to reduce the use of the battery and the capacitor, the public connection point is also connected to the power grid through the PCS3 and the breaker QF 2. The added PCS3 may also be used to supplement the capacity of a battery or capacitor.
When the split test of the PCS1 and the PCS2 is required, the alternating current side breaker QF1 is closed, the alternating current side isolating switch QS1 is closed, the breakers QF2 and QF3 are closed at the same time, the whole loop enters a state to be tested, one group of PCS1 in two groups of PCS is set to work in a VF mode (VF mode, namely constant voltage and frequency control mode), and the other group of PCS2 in the PQ mode (PQ mode, namely constant active and reactive control mode).
When the PCS2 is set to perform constant power or constant current discharge and the PCS1 is not in time for power change, the power of the PCS2 is supplemented by a battery or a capacitor in the first stage after the power is increased; because the capacity of the battery pack or the capacitor is small, in the second stage, the PCS3 in the hot standby state is used for supplementary charging; in the third stage, the PCS1 enters a charging state to realize power balance, and then enters the drag-and-drop test stage of two PCS.
When the PCS2 is set to carry out constant power or constant current charging and the PCS1 does not change power, the power of the PCS2 is supplemented by a battery pack or a capacitor in the first stage after the power is increased; in the second stage, PCS3 in a hot standby state is used for supplementary charging due to the small capacity of the battery pack or the capacitor; in the third stage, the PCS1 enters a discharge state to realize power balance, and then enters the two PCS dual-pull test stages.
In the test process, information of the PCS3 and the battery can be uploaded to an industrial personal computer, so that unified monitoring of the information is realized; information of the PCS1 and the PCS2 can be uploaded to an industrial personal computer for unified monitoring, or the industrial personal computer is not uploaded, so that the PCS can automatically coordinate and control dragging. The working state of the test platform can be monitored in real time through the industrial personal computer, the PCS3 can be adjusted to work in a charging state or a discharging state timely according to detection conditions, and when alarm and fault information occur, a warning can be sent out or a protection device can be started timely to stop test work.
The industrial personal computer monitors the working states of the PCS1, the PCS2 and the PCS3 in real time, records the operation, alarm and fault data of the PCS1, the PCS2 and the PCS3 in real time, and monitors the BMS information and the state information of each switch or circuit breaker in real time. The industrial personal computer can record and store test data, and can also upload data or alarm fault information to a client server or a monitoring platform in a wired or wireless communication mode to ensure the safe operation of the test system.
In the embodiment, two types of sources for supplying power are provided, one type is a battery or a capacitor, and the speed for supplying power by the battery and the capacitor is higher, so that the response speed of the test platform can be improved; the other type is PCS3, which can also charge the battery and capacitor simultaneously when PCS3 provides power boost. It should be noted that, although the PCS3 has grid access when supplying power, PCS3 is a test PCS, which is well protected, and even if there is a fault in PCS1 and PCS2, no fault current will be introduced into the grid through PCS 3.
In practical application, power supplement can be provided by a battery or a capacitor according to requirements, or by the PCS 3; when only the power supplement is provided by a battery or a capacitor, the PCS3 is not arranged, and only the battery or the capacitor provides power support for the drag test, in this case, enough power support can be provided by increasing the capacity of the battery or the capacitor, and the battery or the capacitor can be charged by other charging equipment when the capacity of the battery or the capacitor is small. When only power supplement through PCS3 is selected, no battery or capacitor may be provided.
The breaker QF1, the disconnector QS1 and the reactor provided in this embodiment are for further optimizing the test platform effect, and as another embodiment, the above devices may not be provided.
Claims (8)
1. An energy storage PCS test platform comprises a first energy storage PCS to be tested and a second energy storage PCS to be tested; the method is characterized in that the alternating current side of the first energy storage PCS to be tested is connected with the alternating current side of the second energy storage PCS to be tested, and the direct current side of the first energy storage PCS to be tested is connected with the direct current side of the second energy storage PCS to be tested; a common connection point is arranged between the direct current side of the first energy storage PCS to be tested and the direct current side of the second energy storage PCS to be tested, the common connection point is connected with a direct current source, and the direct current source is a battery/capacitor energy storage device;
the public connection point is also connected with a third test energy storage PCS, the direct current side of the third test energy storage PCS is connected with the public connection point, and the alternating current side of the third test energy storage PCS is connected with a power grid;
the direct current source and the third test energy storage PCS provide power supplement for the first energy storage PCS to be tested and the second energy storage PCS to be tested in the drag test process, and when the third test energy storage PCS provides power supplement, the direct current source is charged;
Specifically, when a drag test of a first energy storage PCS to be tested and a second energy storage PCS to be tested is required, one set of the first energy storage PCS to be tested and the second energy storage PCS to be tested is set to work in a VF mode, namely a constant voltage and frequency control mode, and the other set of the first energy storage PCS to be tested and the second energy storage PCS to be tested is set to work in a PQ mode, namely a constant active and reactive control mode;
when the second energy storage PCS to be tested is set to perform constant power or constant current discharge, and the first energy storage PCS to be tested does not have time to change the power, the power of the second energy storage PCS to be tested is supplemented by a battery or a capacitor in the first stage after the power of the second energy storage PCS to be tested is increased; in the second stage, the third test energy storage PCS in the hot standby state is used for supplementary charging due to the fact that the capacity of the battery or the capacitor is small; in the third stage, the first energy storage PCS to be tested enters a charging state to realize power balance, and the two energy storage PCS to be tested enter a drag test stage;
when the second energy storage PCS to be tested is set to carry out constant power or constant current charging and the first energy storage PCS to be tested does not have time to change the power, the power of the second energy storage PCS to be tested is supplemented by a battery or a capacitor in the first stage after the power of the second energy storage PCS to be tested is increased; in the second stage, the third test energy storage PCS in the hot standby state is used for supplementary charging due to the fact that the capacity of the battery or the capacitor is small; and in the third stage, the first energy storage PCS to be tested enters a discharging state to realize power balance, and the two groups of energy storage PCS to be tested enter a drag test stage.
2. The energy storage PCS test platform of claim 1 wherein a first switch is disposed between the battery/capacitive energy storage device and the common connection point.
3. The energy storage PCS test platform of claim 1 or 2 wherein a circuit breaker and a disconnector are arranged between the AC side of the first energy storage PCS to be tested and the AC side of the second energy storage PCS to be tested.
4. The energy storage PCS test platform of claim 1 or 2 wherein a first reactor is arranged between the direct current side of the first energy storage PCS to be tested and the common connection point, and a second reactor is arranged between the direct current side of the second energy storage PCS to be tested and the common connection point.
5. The energy storage PCS test platform of claim 1 wherein the dc source is a third test energy storage PCS to which the ac side of the third test energy storage PCS is connected to a power grid.
6. The energy storage PCS test platform of claim 5 wherein the ac side of the third test energy storage PCS is connected to the grid through a second switch.
7. The energy storage PCS test platform of claim 5 or 6 wherein a circuit breaker and a disconnector are arranged between the AC side of the first energy storage PCS to be tested and the AC side of the second energy storage PCS to be tested.
8. The energy storage PCS test platform according to claim 5 or 6 wherein a first reactor is arranged between the DC side of the first energy storage PCS to be tested and the common connection point, and a second reactor is arranged between the DC side of the second energy storage PCS to be tested and the common connection point.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911242848.4A CN111025057B (en) | 2019-12-06 | 2019-12-06 | Energy storage PCS test platform |
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| CN201911242848.4A CN111025057B (en) | 2019-12-06 | 2019-12-06 | Energy storage PCS test platform |
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| CN111025057A CN111025057A (en) | 2020-04-17 |
| CN111025057B true CN111025057B (en) | 2022-06-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110350558A (en) * | 2019-08-20 | 2019-10-18 | 廊坊英博电气有限公司 | A kind of PCS accumulator and device |
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| JP6384483B2 (en) * | 2013-09-19 | 2018-09-05 | 東芝三菱電機産業システム株式会社 | Battery system |
| CN106959418A (en) * | 2016-01-11 | 2017-07-18 | 上海电气集团股份有限公司 | Test system and method for testing based on energy storage PCS |
| CN106776329B (en) * | 2016-12-23 | 2019-06-18 | 北京天诚同创电气有限公司 | The adjustment method and commissioning device of energy accumulation current converter |
| JP6462738B2 (en) * | 2017-02-06 | 2019-01-30 | 三菱電機株式会社 | Power converter |
| JP6952544B2 (en) * | 2017-09-14 | 2021-10-20 | 東海旅客鉄道株式会社 | Power conversion system |
| CN109061338B (en) * | 2018-07-04 | 2021-09-14 | 蔚来(安徽)控股有限公司 | Energy storage PCS drag-and-drop test platform and method |
| CN109725262A (en) * | 2018-12-21 | 2019-05-07 | 长园深瑞继保自动化有限公司 | Battery charging and discharging test method and system based on energy storage PCS+BMS |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110350558A (en) * | 2019-08-20 | 2019-10-18 | 廊坊英博电气有限公司 | A kind of PCS accumulator and device |
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