Energy-saving micro-grid test platform and energy-saving micro-grid system

Abstract

The utility model discloses an energy-saving micro-grid test platform and an energy-saving micro-grid system, which are used for testing energy storage products, and the energy-saving micro-grid test platform comprises a first energy storage cabinet, a second energy storage cabinet, a first switch and a second switch, the first energy storage cabinet is electrically connected to the first node through the first switch and the first charging and discharging end of the energy storage product, and the second energy storage cabinet is electrically connected to the first node through the second switch and the first charging and discharging end of the energy storage product. Through the above structure, the charging and discharging test of energy storage products with different powers is realized, the electric energy is saved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of a microgrid test platform, in particular to an energy-saving microgrid test platform and an energy-saving microgrid system. Background Art

[0002] Renewable energy sources such as solar power generation and wind power generation have problems of unstable and intermittent power supply, which affect the stability of the power grid. By setting up an energy storage system (ESS, Energy Storage System), the dynamic difference problems of power generation, power transmission and distribution, and power consumption can be buffered, the impact caused by the grid connection of renewable energy can be reduced, and the stability of the power grid operation can be increased. As the core of the energy storage system, the research on the grid-connected and off-grid operation and its switching control of the microgrid device play a crucial role in the development of the energy storage system. Therefore, the grid-connected control technology of the energy storage system has received more and more attention.

[0003] The existing microgrid test platforms can usually only charge and discharge small-power energy storage products. When charging large-power energy storage products, the grid power is often too low, resulting in the energy storage products not being able to reach full power, that is, they cannot provide the required electric energy. Moreover, during the discharge process of large-power energy storage products, there will be a phenomenon of reverse power flow into the grid, resulting in fines for users, increased costs, and excessive power consumption. Summary of the Utility Model

[0004] The utility model provides an energy-saving microgrid test platform and an energy-saving microgrid system to solve the defects existing in the prior art, realizing the charge and discharge test of large-power energy storage products. Moreover, during the discharge process of the energy storage products, most of the electric energy can be returned to the energy storage cabinet, greatly reducing the power consumption, saving electric energy, and reducing costs.

[0005] In a first aspect, the utility model provides an energy-saving microgrid test platform for testing energy storage products, including: a first energy storage cabinet, a second energy storage cabinet, a first switch, and a second switch;

[0006] The first energy storage cabinet is electrically connected to the first charge and discharge end of the energy storage product through the first switch at a first node, and the second energy storage cabinet is electrically connected to the first charge and discharge end of the energy storage product through the second switch at the first node.

[0007] Optionally, the test platform further includes: an analog power grid and a third switch;

[0008] The analog power grid is electrically connected to the first node through the third switch.

[0009] Optionally, the test platform further includes: a fourth switch;

[0010] The fourth switch is electrically connected between the first node and the third switch.

[0011] Optionally, the test platform further includes: a fifth switch;

[0012] The fifth switch is electrically connected between the third switch and the second charge and discharge terminal of the energy storage product.

[0013] Optionally, the test platform further includes: at least one grid simulator;

[0014] Each grid simulator is connected in parallel between the first node and the simulated input terminal of the energy storage product.

[0015] Optionally, at least one grid simulator includes a first grid simulator and a second grid simulator;

[0016] The power of the first grid simulator is less than the power of the first energy storage cabinet or the second energy storage cabinet, and the power of the second grid simulator is less than the power of the first energy storage cabinet or the second energy storage cabinet.

[0017] Optionally, the test platform further includes: a sixth switch;

[0018] The sixth switch is electrically connected between the first node and the first charge and discharge terminal of the energy storage product.

[0019] Optionally, the test platform further includes: a seventh switch;

[0020] The first output terminal of the energy storage product is electrically connected to the electrical load through the seventh switch.

[0021] Optionally, the test platform further includes: a transformer and an eighth switch;

[0022] The second output terminal of the energy storage product is electrically connected to the electrical load through the eighth switch and the transformer in sequence.

[0023] In a second aspect, the present utility model provides an energy-saving microgrid system, including: an energy storage product and the above-mentioned energy-saving microgrid test platform.

[0024] According to the technical solution of the present utility model, by providing the first energy storage cabinet and the second energy storage cabinet, and providing the first switch between the first energy storage cabinet and the energy storage product, and the second switch between the second energy storage cabinet and the energy storage product, it is possible to close at least one of the first switch and the second switch according to the power of the energy storage product, so as to realize the charge and discharge between the first energy storage cabinet, the second energy storage cabinet and the energy storage product. With the above structure, the charge and discharge test of a high-power energy storage product is realized, greatly reducing the power loss of electric energy, saving electric energy and reducing costs.

[0025] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of an energy-saving microgrid test platform provided by an embodiment of the present utility model;

[0028] Figure 2 It is a schematic structural diagram of the second energy-saving microgrid test platform provided by an embodiment of the present utility model. Detailed Embodiments

[0029] In order to enable those skilled in the art to better understand the solutions of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here.

[0031] In one embodiment, Figure 1 It is a schematic structural diagram of an energy-saving microgrid test platform provided by an embodiment of the present utility model. As Figure 1 shown, the test platform is used to test energy storage products. The test platform includes: a first energy storage cabinet 1, a second energy storage cabinet 2, a first switch K1, and a second switch K2; the first energy storage cabinet 1 is electrically connected to the first charge and discharge terminal 31 of the energy storage product 3 through the first switch K1 at a first node A, and the second energy storage cabinet 2 is electrically connected to the first charge and discharge terminal 31 of the energy storage product 3 through the second switch K2 at the first node A.

[0032] Among them, the first energy storage cabinet 1 and the second energy storage cabinet 2 are devices for storing electric energy, and can be used to charge and discharge the energy storage product 3. The first switch K1 is used to realize the on-off between the first energy storage cabinet 1 and the energy storage product 3; the second switch K2 is used to realize the on-off between the second energy storage cabinet 2 and the energy storage product 3.

[0033] Specifically, the first energy storage cabinet 1 is electrically connected to the first charge and discharge terminal 31 of the energy storage product 3 through the first switch K1 and is connected to the first node A. The second energy storage cabinet 2 is electrically connected to the first charge and discharge terminal 31 of the energy storage product 3 through the second switch K2 and is connected to the first node A. Therefore, the first energy storage cabinet 1 can transfer the stored electric energy to the first charge and discharge terminal 31 of the energy storage product 3 through the first switch K1 to charge the energy storage product 3. The second energy storage cabinet 2 can transfer the stored electric energy to the first charge and discharge terminal 31 of the energy storage product 3 through the second switch K2 to charge the energy storage product 3. Similarly, after the energy storage product 3 is fully charged, the energy storage product 3 can also return the stored electric energy to the first energy storage cabinet 1 and the second energy storage cabinet 2 through the first switch K1 and the second switch K2, so that the electric energy is stored in the first energy storage cabinet 1 and the second energy storage cabinet 2 to discharge the energy storage product 3. In this embodiment, when performing the safety standard test on the energy storage product 3, if the power of the energy storage product 3 is less than the power of the first energy storage cabinet 1 and greater than the power of the second energy storage cabinet 2, it indicates that the charge and discharge test of the energy storage product 3 can be achieved through the first energy storage cabinet 1. Therefore, only the first switch K1 needs to be closed. Among them, the method of closing the first switch K1 can include but is not limited to manually pressing the switch button or controlling the switch to turn off through an external controller, etc., which is not specifically limited here. If the power of the energy storage product 3 is less than the power of the second energy storage cabinet 2 and greater than the power of the first energy storage cabinet 1, it indicates that the charge and discharge test of the energy storage product 3 can be achieved through the second energy storage cabinet 2. Therefore, only the second switch K2 needs to be closed. Among them, the method of closing the second switch K2 can include but is not limited to manually pressing the switch button or controlling the switch to turn off through an external controller, etc., which is not specifically limited here. In addition, light-emitting elements can be respectively arranged at the positions of the first switch K1 and the second switch K2. For example, when the first switch K1 and / or the second switch K2 is closed, the corresponding light-emitting element emits light. When the first switch K1 or the second switch K2 is disconnected, the corresponding light-emitting element does not emit light; or, the on-off status of the corresponding switch is indicated by different light-emitting colors of the light-emitting element, so that the staff can more intuitively view the conduction status of the switch. If the power of the energy storage product 3 is less than the sum of the powers of the first energy storage cabinet 1 and the second energy storage cabinet 2 but greater than the power of the first energy storage cabinet 1 or the second energy storage cabinet 2, it indicates that only the first energy storage cabinet 1 or the second energy storage cabinet 2 cannot meet the charge and discharge test of the energy storage product 3. Therefore, the first energy storage cabinet 1 and the second energy storage cabinet 2 need to work simultaneously to achieve the charge and discharge test of the energy storage product 3. At this time, both the first switch K1 and the second switch K2 need to be closed to achieve the charge and discharge test of the energy storage product 3.

[0034] It should be noted that the power of the first energy storage cabinet 1 and the power of the second energy storage cabinet 2 can be equal or unequal, and can be specifically determined according to the actual situation, and no specific limitation is made here. In this embodiment, the power of the first energy storage cabinet 1 is set to be the same as that of the second energy storage cabinet 2, both being 400 kW. If the power of the energy storage product 3 is less than 400 kW, the charge-discharge test of the energy storage product 3 by the energy storage cabinet 1(2) can be realized by closing the first switch K1 or the second switch K2. Which of the first switch K1 or the second switch K2 to close can be determined according to the actual situation, and no specific limitation is made here. If the power of the energy storage product 3 is greater than 400 kW and less than 800 kW, it indicates that using only one energy storage cabinet 1(2) cannot meet the charge-discharge test of the energy storage product 3. Therefore, it is necessary to close both the first switch K1 and the second switch K2 at the same time, so that the first energy storage cabinet 1 and the second energy storage cabinet 2 transfer the stored electric energy to the first charge-discharge end 31 of the energy storage product 3 through the first switch K1 and the second switch K2, and at the same time, the electric energy stored in the energy storage product 3 can also be transferred to the first energy storage cabinet 1 and the second energy storage cabinet 2 through the first switch K1 and the second switch K2, thereby realizing the charge-discharge test of the energy storage product 3. Thus, the charge-discharge test of the high-power energy storage product 3 is realized.

[0035] It should also be noted that during the process of realizing the charge-discharge test of the energy storage product 3, during the charging test, the energy storage product 3 can be charged through the energy storage cabinet 1(2), and during the discharging test, the electric energy in the energy storage product 3 can be returned to the energy storage cabinet 1(2). Only 20% of the electric energy is lost during one charge-discharge process, and 80% of the electric energy can still be stored in the energy storage cabinet 1(2) after one charge-discharge cycle, saving 80% of the electric energy and reducing the cost.

[0036] The technical solution of the embodiment of the present invention, by setting the first energy storage cabinet and the second energy storage cabinet, and setting the first switch between the first energy storage cabinet and the energy storage product, and setting the second switch between the second energy storage cabinet and the energy storage product, enables the first switch, the second switch or the first switch and the second switch to be closed according to the power of the energy storage product, so as to realize the charge-discharge between the first energy storage cabinet, the second energy storage cabinet and the energy storage product. With the above structure, the charge-discharge test of the high-power energy storage product is realized, greatly reducing the loss of electric energy, saving electric energy and reducing the cost.

[0037] Optionally, Figure 2 is a schematic structural diagram of the second energy-saving microgrid test platform provided by the embodiment of the present invention. As Figure 2 shown, the test platform further includes: an analog power grid 4 and a third switch K3; the analog power grid 4 is electrically connected to the first node A through the third switch K3.

[0038] Among them, the simulated power grid 4 is used to simulate a power system, which can include substations and power transmission and distribution lines of various voltages. The simulated power grid 4 can also be used to supply power to the energy storage product 3, as well as to supply power to the first energy storage cabinet 1 and the second energy storage cabinet 2. The third switch K3 is used to realize the on-off between the simulated power grid 4 and the first node A.

[0039] Specifically, the simulated power grid 4 can work simultaneously with the first energy storage cabinet 1 and the second energy storage cabinet 2, or work alone to achieve charge and discharge tests on the energy storage product 3 according to the power requirements of different energy storage products 3. If the power of the energy storage product 3 is greater than the sum of the powers of the first energy storage cabinet 1 and the second energy storage cabinet 2, but less than the sum of the powers of the first energy storage cabinet 1, the second energy storage cabinet 2 and the simulated power grid 4, the first switch K1, the second switch K2 and the third switch K3 can be closed, so that the simulated power grid 4, the first energy storage cabinet 1 and the second energy storage cabinet 2 can respectively achieve charge and discharge tests on the energy storage product 3 through the third switch K3, the second switch K2 and the first switch K1. When both the first energy storage cabinet 1 and the second energy storage cabinet 2 fail and the power of the energy storage product 3 is less than the power of the simulated power grid 4, the charge and discharge test on the energy storage product 3 can be achieved by closing the third switch K3. In addition, when the electric energy of the first energy storage cabinet 1 and the second energy storage cabinet 2 is exhausted, the first energy storage cabinet 1 and the second energy storage cabinet 2 can be powered by closing the first switch K1, the second switch K2 and the third switch K3.

[0040] It should be noted that the power of the simulated power grid 4 can be the same as or different from the power of the first energy storage cabinet 1 or the second energy storage cabinet 2, and no specific limitation is made here. In this embodiment, the powers of both the first energy storage cabinet 1 and the second energy storage cabinet 2 are 400kW, and the power of the simulated power grid 4 is 300kW. Therefore, when performing safety regulations tests on the energy storage product 3 with a power of 800kW - 1100kW, the first switch K1, the second switch K2 and the third switch K3 can be closed simultaneously, so that the simulated power grid 4, the first energy storage cabinet 1 and the second energy storage cabinet 2 can achieve charge and discharge tests on the energy storage product 3.

[0041] Optionally, continue to refer to Figure 2 , the test platform further includes: a sixth switch K6; the sixth switch K6 is electrically connected between the first node A and the first charge and discharge end 31 of the energy storage product 3.

[0042] Among them, the sixth switch K6 is used to realize the on-off between the first node A and the first charge and discharge end 31 of the energy storage product 3.

[0043] Specifically, when the first energy storage cabinet 1, the second energy storage cabinet 2 or the simulated power grid 4 performs charge and discharge tests on the energy storage product 3, the sixth switch K6 needs to be closed so that electric energy can be transmitted smoothly. In addition, when the electric energy of the first energy storage cabinet 1 and the second energy storage cabinet 2 is exhausted and power supply to the first energy storage cabinet 1 and the second energy storage cabinet 2 is required, the first switch K1, the second switch K2 and the third switch K3 can be closed, and the sixth switch K6 can be opened to achieve rapid power supply to the first energy storage cabinet 1 and the second energy storage cabinet 2.

[0044] Optionally, continuing to refer to Figure 2 , the test platform further includes: a fourth switch K4; the fourth switch K4 is electrically connected between the first node A and the third switch K3.

[0045] Among them, the fourth switch K4 is arranged between the first node A and the third switch K3 and is used to transmit the electric energy in the simulated power grid 4 to the first energy storage cabinet 1, the second energy storage cabinet 2 or the energy storage product 3. Usually, when power supply to the energy storage product 3 and / or the energy storage cabinet 1(2) needs to be performed through the simulated power grid 4, this fourth switch K4 can be closed so that the electric energy in the simulated power grid 4 can be normally transmitted, realizing charge and discharge tests on the energy storage product 3 and normal power supply to the energy storage cabinet 1(2); when the electric energy stored in the energy storage cabinet 1(2) is sufficient and the power of the energy storage product 3 is less than the sum of the powers of the first energy storage cabinet 1 and the second energy storage cabinet 2, power supply through the simulated power grid 4 is not required at this time, and the fourth switch K4 is opened to isolate the simulated power grid 4 from the energy storage cabinet 1(2) and the energy storage product 3, saving the electric energy of the simulated power grid 4.

[0046] Optionally, continuing to refer to Figure 2 , the test platform further includes: a fifth switch K5; the fifth switch K5 is electrically connected between the third switch K3 and the second charge and discharge end 32 of the energy storage product 3.

[0047] Among them, the fifth switch K5 is used to realize the on-off between the third switch K3 and the second charge and discharge end 32 of the energy storage product 3. When the simulated power grid 4 needs to perform charge and discharge tests on the energy storage product 3, the third switch K3 and the fifth switch K5 can also be closed so that the electric energy of the simulated power grid 4 can be transmitted to the second charge and discharge end 32 of the energy storage product, realizing charge and discharge tests on the energy storage product 3.

[0048] Optionally, continuing to refer to Figure 2 , the test platform further includes: at least one grid simulator 5; each grid simulator 5 is connected in parallel between the first node A and the simulated input end 33 of the energy storage product 3.

[0049] Optionally, at least one power grid simulator 5 includes a first power grid simulator 51 and a second power grid simulator 52; the power of the first power grid simulator 51 is less than the power of the first energy storage cabinet 1 or the second energy storage cabinet 2, and the power of the second power grid simulator 52 is less than the power of the first energy storage cabinet 1 or the second energy storage cabinet 2.

[0050] Among them, the power grid simulator 5 is a multi-functional power grid simulator that can simulate the output of the power grid, supply power to the energy storage product 3, and at the same time can also simulate the grid-connected electric energy of the energy storage product 3. The power grid simulator 5 can controllably simulate various electrical performance anomalies such as undervoltage, overvoltage, underfrequency, overfrequency, high and low voltage ride-through, or harmonic injection that may occur in the actual operation of the power grid, so that the energy storage product 3 can operate in an environment as close as possible to the real power grid, thereby more accurately testing the electrical performance and stability of the energy storage product 3.

[0051] Specifically, to simulate the electrical performance test of the energy storage product 3, at least one power grid simulator 5 can be set between the first node A and the simulation input end 33 of the energy storage product 3. In this embodiment, two power grid simulators 5 are set, namely the first power grid simulator 51 and the second power grid simulator 52, and the power of the first power grid simulator 51 is set to be less than the power of the first energy storage cabinet 1 or the second energy storage cabinet 2, and the power of the second power grid simulator 52 is less than the power of the first energy storage cabinet 1 or the second energy storage cabinet 2. By closing the first switch K1, the fourth switch K4 or the second switch K2, the fourth switch K4, the first energy storage cabinet 1 or the second energy storage cabinet 2 can supply power to the first power grid simulator 51 and the second power grid simulator 52, so that the first power grid simulator 51 and the second power grid simulator 52 can, according to the electrical performance parameters of the energy storage product 3, normally simulate the ability test of triggering or avoiding faults of the energy storage product 3 when the power grid fails. Exemplarily, the first power grid simulator 51 can include a DC power grid simulator, and the second power grid simulator 52 can include an AC power grid simulator.

[0052] Optionally, continue to refer to Figure 2 , the test platform further includes: a seventh switch K7; the first output end 34 of the energy storage product 3 is electrically connected to the electrical load 6 through the seventh switch K7.

[0053] Among them, when performing an off-grid load test on the energy storage product 3, an electrical load 6 can be connected to the first output terminal 34 of the energy storage product 3, and the electrical load 6 can be controlled by a host computer. If the voltage of the energy storage product 3 is the same as the voltage of the electrical load 6, for example, the voltage of both the energy storage product 3 and the electrical load 6 is 400V, then a seventh switch K7 can be set between the first output terminal 34 of the energy storage product 3 and the electrical load 6. By closing the seventh switch K7, the electrical energy of the energy storage product 3 can be transmitted to the electrical load 6 through the seventh switch K7 to charge the electrical load 6. In this way, the on-load capacity of the energy storage product 3 can be tested according to the charging situation of the electrical load 6. Exemplarily, the electrical load 6 can include a PLC load.

[0054] Optionally, continuing to refer to Figure 2 , the test platform further includes: a transformer 7 and an eighth switch K8; the second output terminal 35 of the energy storage product 3 is electrically connected to the electrical load 6 through the eighth switch K8 and the transformer 7 in sequence.

[0055] Among them, the transformer 7 can convert the input voltage into an ideal output voltage. In this embodiment, the transformer 7 can include a step-down transformer, that is, it can convert the input high voltage into a low voltage and output it. The eighth switch K8 is used to realize the on-off between the transformer 7 and the energy storage product 3.

[0056] Specifically, when performing an off-grid load test on the energy storage product 3, if the voltage of the energy storage product 3 is higher than the voltage of the electrical load 6, for example, the voltage of the energy storage product 3 is 690V and the voltage of the electrical load 6 is 400V, then an eighth switch K8 and a transformer 7 need to be set between the electrical load 6 and the energy storage product 3. By closing the eighth switch K8, the electrical energy of the energy storage product 3 can be transmitted to the electrical load 6 after passing through the eighth switch K8 and the transformer 7 in sequence to charge the electrical load 6. By observing the charging situation of the electrical load 6, the strength test of the on-load capacity of the energy storage product 3 can be realized.

[0057] Based on the same inventive concept, an embodiment of the present invention provides an energy-saving microgrid system, including: an energy storage product and the above-mentioned energy-saving microgrid test platform, and having corresponding functional modules and beneficial effects of the energy-saving microgrid test platform.

[0058] It should be understood that various forms of processes shown above can be used, reordering, adding or deleting steps. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0059] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An energy-saving microgrid test platform for testing energy storage products, characterized in that: include: A first energy storage cabinet, a second energy storage cabinet, a first switch, a second switch, a first power grid simulator, and a second power grid simulator; The first energy storage cabinet is electrically connected to the first node with the first charging and discharging end of the energy storage product through the first switch, and the second energy storage cabinet is electrically connected to the first node with the first charging and discharging end of the energy storage product through the second switch; the first power grid simulator and the second power grid simulator are both connected in parallel between the first node and the simulation input end of the energy storage product, the power of the first power grid simulator is less than the power of the first energy storage cabinet or the second energy storage cabinet, and the power of the second power grid simulator is less than the power of the first energy storage cabinet or the second energy storage cabinet.

2. The energy-saving microgrid test platform according to claim 1, characterized in that: Also includes: Simulate the grid and the third switch; The simulated power grid is electrically connected to the first node through the third switch.

3. The energy-saving microgrid test platform according to claim 2, characterized in that: Also includes: Fourth switch; The fourth switch is electrically connected between the first node and the third switch.

4. The energy-saving microgrid test platform according to claim 2, characterized in that: Also includes: Fifth switch; The fifth switch is electrically connected between the third switch and the second charging and discharging end of the energy storage product.

5. The energy-saving microgrid test platform according to claim 1, characterized in that: Also includes: The sixth switch; The sixth switch is electrically connected between the first node and the first charging and discharging end of the energy storage product.

6. The energy-saving microgrid test platform according to claim 1, characterized in that: Also includes: The seventh switch; The first output end of the energy storage product is electrically connected to the power load through the seventh switch.

7. The energy-saving microgrid test platform according to claim 1, characterized in that: Also included: a transformer and an eighth switch; The second output end of the energy storage product is electrically connected to the power load through the eighth switch and the transformer in sequence.

8. An energy-saving microgrid system, characterized in that: include: An energy storage product and an energy-saving microgrid test platform as described in any one of claims 1-7.

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