Novel energy storage converter test platform and control system

Abstract

The invention discloses a novel energy storage converter test platform and a control system, and relates to the technical field of energy storage, and the platform comprises a plurality of cascaded single-machine test modules; the single-machine test module is composed of an AC-DC converter, a DC booster and a DC step-down transformer. Wherein the alternating current side of the alternating current-direct current converter is connected to commercial power, and the direct current side of the alternating current-direct current converter is provided with a first direct current voltage output port; one side of the DC booster is connected with the DC side of the AC-DC converter, and the other side of the DC booster is provided with a second DC voltage output port which can be connected with a tested sample; one side of the DC step-down transformer is connected with the DC side of the AC-DC converter, and the other side of the DC step-down transformer is provided with a third DC voltage output port which can be connected with a tested sample; direct-current voltage output ports among the single-machine test modules are designed to be connected in series or in parallel according to the test requirement of a tested sample, and flexible expansion of the energy storage test platform is achieved.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a novel energy storage converter test platform and control system. Background Technology

[0002] With the rapid development of productivity and the ever-increasing demand for energy, the power industry has made great strides, high-power power electronic equipment has been widely used and developed, people are paying more and more attention to the sustainable development of energy, the installed capacity of new energy equipment has repeatedly reached new highs, and in recent years, various new energy storage devices have ushered in huge market demand.

[0003] Currently, energy storage converter devices come in a variety of structures, with different capacities, voltage levels, and topology combinations. As a result, the testing of energy storage converters is subject to various limitations, and there is no universal testing equipment, which hinders the normal production, installation, and commissioning of energy storage converters.

[0004] Therefore, how to effectively test energy storage converters and ensure the stable operation of energy storage systems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides a novel energy storage converter test platform and control system, which solves the problem of how to integrate AC-DC converters and DC converters and design variable connections for their output ports, thereby enabling flexible expansion of the energy storage test platform.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide a novel energy storage converter testing platform, comprising: Several cascaded stand-alone test modules; The single-unit test module consists of an AC-DC converter, a DC boost converter, and a DC buck converter; The AC side of the AC-DC converter is connected to the mains power, and the DC side of the AC-DC converter is provided with a first DC voltage output port. One side of the DC boost converter is connected to the DC side of the AC-DC converter, and the other side is provided with a second DC voltage output port that can be connected to the sample under test. One side of the DC step-down converter is connected to the DC side of the AC-DC converter, and the other side is provided with a third DC voltage output port that can be connected to the sample under test. The DC voltage output ports of each of the individual test modules are designed to be connected in series or in parallel according to the test requirements of the sample under test.

[0007] Furthermore, the output voltage levels of the third DC voltage output port, the first DC voltage output port, and the second DC voltage output port increase sequentially from low to high.

[0008] Furthermore, the standalone test module is designed as follows: When the capacity and input voltage of the sample under test both meet the first preset condition, the DC voltage output ports of the corresponding number of single-unit test modules are connected in series. When the capacity and input voltage of the sample under test both meet the second preset condition, the DC voltage output ports of the corresponding number of single-unit test modules are connected in parallel.

[0009] Furthermore, each of the single-unit test modules has an AC interface on its AC side that is connected to an isolation transformer, and the AC sides of each of the single-unit test modules are expanded by connecting isolation transformers in parallel.

[0010] Furthermore, the AC interface can be configured for single-phase or three-phase access.

[0011] Furthermore, both the DC boost converter and the DC buck converter can be configured as DC chopper circuits.

[0012] Furthermore, the AC-DC converter, the DC boost converter, and the DC buck converter are all equipped with corresponding DC switches.

[0013] Furthermore, the AC-DC converter also includes several bridge arms and capacitors, wherein each bridge arm is composed of a single IGBT module, IGCT module, or cascaded multilevel structure.

[0014] Another embodiment of the present invention provides a novel energy storage converter test platform control system, applied to the aforementioned novel energy storage converter test platform, comprising: A standalone platform controller is used to receive the test requirement command of the sample under test and trigger the control of the output voltage of a single standalone test module; The expansion platform controller is communicatively connected to each of the single-machine platform controllers. When multiple single-machine test modules are running collaboratively, it issues corresponding collaborative control commands to each of the single-machine platform controllers according to the current test requirement commands.

[0015] Furthermore, the single-machine platform controller includes: an AC-DC converter controller and a DC converter controller; The AC-DC converter controller is used to receive and parse the test requirement command, determine the corresponding phase control mode, and control the AC output of the AC converter to output the first DC voltage.

[0016] Compared with the prior art, the beneficial effects of the embodiments of the present invention are at least one of the following: This invention constructs a cascaded test platform with single-unit test modules as the basic units. Each module integrates an AC-DC converter, a DC boost converter, and a DC buck converter. A DC voltage output port with corresponding voltage levels is designed on each converter, realizing wide adaptability to various energy storage converter voltage levels. By flexibly connecting the DC output ports of multiple modules in series or parallel according to the test requirements of the energy storage converter, the scalability of the test platform can be improved, ensuring the stable operation of the energy storage system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a novel energy storage converter test platform in one embodiment of the present invention; Figure 2 This is a schematic diagram of a test platform structure for high-capacity high voltage in one embodiment of the present invention; Figure 3 This is a schematic diagram of a test platform structure for high-capacity, low-voltage applications in one embodiment of the present invention. Figure 4 This is a schematic diagram of the control system structure of a novel energy storage converter test platform in one embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this application, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used herein are for illustrative purposes only and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing specific embodiments only and is not intended to limit the invention. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] One embodiment of the present invention provides a novel energy storage converter test platform. For details, please refer to [link to relevant documentation]. Figure 1 , Figure 1 The diagram shows a novel energy storage converter test platform structure in one embodiment of the present invention. The platform includes several cascaded single-unit test modules, each consisting of an AC-DC converter 1, a DC boost converter 2, and a DC buck converter 3.

[0023] The AC-DC converter 1 consists of several bridge arms and capacitors. Each bridge arm is composed of a single IGBT module, an IGCT module, or a cascaded multilevel structure, such as... Figure 1 As shown, in this embodiment, the AC-DC converter 1 includes three bridge arms: A, B, and C. Furthermore, to achieve protection segmentation, a DC switch K2 is also provided at the U2 port. The AC side of the AC-DC converter 1 can be connected to the mains power supply via a series filter and a circuit breaker. The DC side of the AC-DC converter 1 is provided with a first DC voltage output port; in this embodiment, the first DC voltage output port is the U2 port. For example, when the test platform is unlocked and running, the control objective of the AC-DC converter 1 is to maintain the capacitor voltage HB_Vol of C1 stable and output this stable DC voltage through the U2 port.

[0024] It should be understood that this embodiment Figure 1The DC converters installed in the system include: DC boost converter 2 and DC buck converter 3.

[0025] In this embodiment, one side of the DC boost converter 2 is connected to the DC side of the AC-DC converter 1, and the other side has a second DC voltage output port, namely port U3, which can be connected to the sample under test (the energy storage converter under test). It should be understood that in this embodiment, the DC boost converter 2 uses port U2 as its input and port U3 as its output, and a DC switch K3 is provided at port U3 for protection disconnection. For example, the DC boost converter 2 can be configured as a DC chopper circuit structure, such as a flying capacitor three-level / two-level DC chopper circuit. Figure 1 As shown, the DC boost converter 2 can be composed of components such as capacitors C21 and C22, resistor R21 and inductor L21.

[0026] Similarly, one side of the DC-DC step-down converter 3 is connected to the DC side of the AC-DC converter 1, and the other side is provided with a third DC voltage output port, namely port U1, which can be connected to the sample under test. It should be understood that in this embodiment, the DC-DC step-down converter 3 uses port U2 as its input and port U1 as its output, and a DC switch K3 is provided at port U1 for protection disconnection. Exemplarily, the DC-DC step-down converter 3 can be configured as a DC chopper circuit structure, such as a two-level Buck circuit or a three-level Buck circuit. Figure 1 As shown, the DC step-down converter 3 can be composed of components such as capacitor C11 and inductor L11.

[0027] It is worth noting that the output voltage levels of the third DC voltage output port U1, the first DC voltage output port U2, and the second DC voltage output port U3 increase sequentially from low to high. For example, the output range of U1 (low voltage) can be set to 100-650Vdc, the output range of U2 (medium voltage) to 650-900Vdc, and the output range of U3 (high voltage) to 900-1500Vdc.

[0028] The DC voltage output ports of each individual test module are designed to be connected in series or in parallel according to the testing requirements of the sample under test. Specifically, when the capacity and input voltage of the sample under test both meet the first preset condition, the DC voltage output ports of the corresponding number of individual test modules are connected in series; and when the capacity and input voltage of the sample under test both meet the second preset condition, the DC voltage output ports of the corresponding number of individual test modules are connected in parallel.

[0029] For example, consider a scenario where the sample under test requires a DC voltage of 3000Vdc and a current of 400A, and the device has a capacity of 1.2MVA. If the capacity and input voltage of the sample under test both meet the first preset conditions (i.e., the input voltage exceeds the upper limit threshold of 1500V for the output voltage of a single test platform, and the capacity exceeds the upper limit threshold of the capacity of a single test platform (e.g., 0.75MVA), then the sample under test is considered to have high capacity and DC input voltage. Further details can be referenced. Figure 2 The connection method shown connects the DC voltage output ports of the corresponding number of stand-alone test modules in series, runs the test platform, and selects the U3 port for output.

[0030] Another scenario arises: the sample under test requires a DC voltage of 1200Vdc, a current of 800A, and a capacity of 0.96MVA. If the sample's capacity and input voltage both meet the second preset condition (i.e., the input voltage is less than the upper limit threshold of 1500V for a single test platform's output voltage), but the capacity still exceeds the upper limit threshold of a single test platform's capacity (e.g., 0.75MVA), then the sample is considered to have a large capacity but a low DC input voltage. This can be considered a reference. Figure 3 The connection method shown connects the DC voltage output ports of the corresponding number of stand-alone test modules in parallel, runs the test platform, and selects the U3 port for output.

[0031] In some implementations of this embodiment, if the input voltage and capacity of the sample under test are both less than the corresponding upper limit threshold (voltage upper limit threshold, capacity upper limit threshold), the correct output port is selected according to the input voltage of the sample under test, and then the stand-alone test platform can be run directly.

[0032] It is worth noting that in this embodiment, each individual test module has an AC interface on its AC side that connects to an isolation transformer. When multiple units on the test platform need to be connected in series or parallel, the AC side of each individual test module can be expanded by connecting the isolation transformers in parallel to meet the testing requirements of various types of energy storage converters under test, such as... Figure 1 As shown on the far left, the AC side can be connected to Ua, Ub, and Uc via an isolation transformer. Specifically, depending on the testing requirements of the sample under test, the AC interface can be selected to be connected in single-phase or three-phase mode. In this embodiment, the AC interface can be adapted to different AC types of samples under test by connecting the arms of the AC-DC converter 1 in different ways to form single-phase or three-phase, and to provide a matching AC power supply for the sample under test.

[0033] One embodiment of the present invention provides a novel control system for an energy storage converter test platform, which is applied to the aforementioned novel energy storage converter test platform. For details, please refer to [link to relevant documentation]. Figure 4 , Figure 4The diagram shown illustrates the structure of a novel energy storage converter test platform control system according to one embodiment of the present invention. The control system includes: A standalone platform controller receives test request commands from the sample under test and triggers the output voltage of a single standalone test module. For example... Figure 4 As shown in this embodiment, the single-machine platform controller includes two parts: an AC-DC converter controller and a DC converter controller.

[0034] The AC-DC converter controller receives and parses test requirement commands, determines the corresponding phase control mode, and controls the AC output of the AC-DC converter 1 to produce the first DC voltage. Specifically, the AC-DC converter controller selects whether to connect in single-phase or three-phase mode according to the test requirements of the sample under test. For example, in single-phase mode, the three bridge arms A, B, and C can be connected in an AB, AC, or BC configuration, while in three-phase mode, they are connected in an ABC configuration.

[0035] Correspondingly, the DC converter controller is responsible for controlling the operation of DC boost converter 2 and DC buck converter 3. That is, when a test scenario requires the use of the U1 and U3 voltage interfaces, the DC converter controller controls the start of the corresponding equipment to perform voltage conversion. For example, by controlling DC boost converter 2 to increase the U2 voltage to the high voltage range of U3, or by controlling DC buck converter 3 to reduce the U2 voltage to the low voltage range of U1.

[0036] It should be understood that the stand-alone test platform is controlled by a stand-alone platform controller. On its operating interface, the DC output ports (U1, U2, U3) are selected, and the corresponding output voltage values ​​are set. Additional undervoltage, overvoltage, and multi-stage overcurrent protection values ​​for AC voltage, or undervoltage, overvoltage, and overcurrent protection values ​​for DC voltage, can also be set. That is, during operation, DC switches K1, K2, and K3 can be controlled to provide disconnection protection for each output port.

[0037] The expansion platform controller communicates with each individual platform controller. When multiple individual test modules are running collaboratively, it issues corresponding collaborative control commands to each individual platform controller based on the current test requirements. Specifically, after connecting to the expansion platform controller, the set values ​​of the DC output port voltages can be set on its operation interface, and the topology of multi-unit combinations can be configured, such as the number of AC parallel stages, DC series and parallel stages. Then, based on the set AC voltage level, DC voltage level, and capacity parameters, it coordinates the control outputs of each individual platform controller, and interlocks protection based on the current connection method.

[0038] It should be understood that this embodiment, through the collaborative control system and test platform, can meet the performance verification of the energy storage converter operating under full load condition by only providing equipment losses (such as device heating and switching losses).

[0039] In summary, the core architecture of the test platform in this embodiment is a single-unit test module. Each single-unit test module integrates an AC-DC converter and a DC step-up / step-down converter, and has the function of selecting three DC output voltage levels covering low voltage (U1), medium voltage (U2), and high voltage (U3), which can flexibly adapt to energy storage converters of different voltage levels. The test platform realizes flexible expansion of output voltage levels by connecting the DC output ports of multiple single-unit modules in series or parallel according to test requirements. It can also coordinate with the control system for single-unit test platforms and cascaded test platforms to perform tests, meet different test scenarios of different types of energy storage converters, and greatly improve the test efficiency of energy storage converters.

[0040] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A novel energy storage inverter test platform, characterized in that, The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform.

2. The novel energy storage inverter test platform of claim 1, wherein, The application relates to a novel energy storage converter test platform.

3. The novel energy storage inverter test platform of claim 1, wherein, The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform.

4. The novel energy storage inverter test platform of claim 1, wherein, The application relates to a novel energy storage converter test platform.

5. The novel energy storage inverter test platform of claim 4, wherein, The application relates to a novel energy storage converter test platform.

6. The novel energy storage inverter test platform of claim 1, wherein, The application relates to a novel energy storage converter test platform.

7. The novel energy storage inverter test platform of claim 1, wherein, The application relates to a novel energy storage converter test platform.

8. The novel energy storage inverter test platform of claim 1, wherein, The application relates to a novel energy storage converter test platform.

9. A novel energy storage inverter test platform control system, characterized in that, The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform.

10. The novel energy storage inverter test platform control system of claim 9, wherein, The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. The application relates to a novel energy storage converter test platform. 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