Test method and test system for energy storage converter power unit, and energy storage converter power unit

Abstract

The invention provides a test method and a test system for an energy storage converter power unit, and the energy storage converter power unit. The test system comprises a control circuit and a to-be-tested circuit, the to-be-tested circuit comprises a plurality of test subsystems, the test subsystems are used for testing an energy storage converter power unit, and each test subsystem comprises an alternating current side protection circuit and a direct current side protection circuit; the energy storage conversion power unit is connected to the rectification module through the DC side protection circuit, and is connected to the load module through the AC side protection circuit. The control circuit is used for collecting preset parameter information in the test subsystem and generating a corresponding protection strategy through a preset judgment rule according to the preset parameter information. According to the exemplary embodiment, the alternating current side protection circuit and the direct current side protection circuit are arranged, so that the test safety of the test system and the test efficiency of the energy storage converter power unit are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage technology, and in particular to a testing method and a testing system for an energy storage and current conversion power unit, and an energy storage and current conversion power unit. Background Art

[0002] The basic topology of cascaded high-voltage direct-mounted energy storage is composed of many power conversion units connected in series. The produced power conversion units must undergo strict quality inspection and performance testing to ensure their functionality and safety in practical applications. After each component is tested and qualified, they need to be assembled into a complete energy storage system, and the entire system must be tested at the system level to verify the performance and stability of the system under various working conditions.

[0003] In the related art, the test method of the energy storage converter power unit selects a single power unit for operation test. During the test, the circuit protection is not perfect, resulting in low test efficiency and low test pass rate.

[0004] It should be noted that the statements herein merely provide background information related to the present disclosure and do not necessarily constitute prior art. Summary of the invention

[0005] In view of the above problems, a test method, a test system and an energy storage conversion power unit are proposed to overcome the above problems or at least partially solve the above problems.

[0006] The embodiments of the present disclosure adopt the following technical solutions:

[0007] In a first aspect, a test system is provided, which includes: a control circuit and a circuit to be tested, the circuit to be tested includes multiple test subsystems, the test subsystem is used for testing an energy storage and conversion power unit, and the test subsystem includes an AC side protection circuit and a DC side protection circuit; the energy storage and conversion power unit is connected to a rectifier module through the DC side protection circuit, and is connected to a load module through the AC side protection circuit; the control circuit is used to collect preset parameter information in the test subsystem, and generate a corresponding protection strategy according to the preset parameter information through preset judgment rules.

[0008] Preferably, each of the energy storage and conversion power units is connected to a DC side protection circuit, and the DC side protection circuit includes at least one of the following: a DC circuit breaker, a DC fuse, a voltage sensor, and an insulation detection sensor; the DC circuit breaker and the DC fuse are used to disconnect the DC circuit to prevent overcurrent from damaging the test system. The voltage sensor is used to collect the voltage value of the DC side protection circuit; the insulation detection sensor is used to collect the insulation value of the DC side protection circuit. .

[0009] Preferably, a plurality of the energy storage and conversion power units are connected to the same AC side protection circuit, and the AC side protection circuit includes one of the following: an AC circuit breaker, an AC fuse, a current sensor, and a temperature sensor; the AC circuit breaker and the AC fuse are used to disconnect the AC circuit to prevent overcurrent from damaging the test system, and at the same time to avoid circuit breakdown caused by the reverse electromotive force generated when the current of the load module changes suddenly; the current sensor is used to collect the current value in the AC side protection circuit; the temperature sensor is used to collect the temperature value of the load module.

[0010] Preferably, the preset parameter information includes at least one of the following: a voltage value and an insulation value of a DC side protection circuit, and a current value and a temperature value of an AC side protection circuit.

[0011] Preferably, the test system further comprises a load heat dissipation system, and the load heat dissipation system is used to dissipate heat for the load module; the protection strategy comprises at least one of the following: a software protection strategy, a current abnormality dynamic protection strategy and an overcurrent dynamic protection strategy.

[0012] Preferably, the software protection strategy includes: status monitoring of the test subsystem; the status monitoring includes at least one of the following: DC circuit breaker status, AC circuit breaker status, DC fuse status, AC fuse status, voltage sensor status, current sensor status, temperature sensor status, loop impedance, load cooling system status, load module temperature.

[0013] The current anomaly dynamic protection strategy includes: after the test system is started, the control circuit monitors the status of the test subsystem; the control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; if the deviation is greater than the preset time length, the control circuit issues a shutdown command.

[0014] The current overcurrent dynamic protection strategy includes: after the test system is started, the control circuit monitors the status of the test subsystem; the control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; determines the overcurrent protection level and the overcurrent allowable duration according to the difference; determines the current overcurrent duration according to the overcurrent protection level and the overcurrent allowable duration; if the current overcurrent duration exceeds the preset duration, the control circuit issues a shutdown command.

[0015] In a second aspect, an energy storage and current conversion power unit is provided, characterized in that the test is performed using any test system as described in the first aspect.

[0016] In a third aspect, a test method for an energy storage inverter power unit is provided, which is applied to any test system as described in the first aspect, and the test method includes: monitoring the state of the test subsystem and obtaining the state monitoring result, wherein the state monitoring includes at least one of the following: DC circuit breaker state, AC circuit breaker state, DC fuse state, AC fuse state, voltage sensor state, current sensor state, temperature sensor state, loop impedance, load cooling system state, load module temperature; in response to the state monitoring result meeting a preset condition, starting the test system and adopting a current abnormality dynamic protection strategy and an overcurrent dynamic protection strategy for the test system, wherein the current abnormality dynamic protection strategy includes: after the test system is started, the control circuit performs a state monitoring on the test subsystem Perform status monitoring; the control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; if the deviation is greater than the preset duration, the control circuit issues a shutdown command; the current overcurrent dynamic protection strategy includes: after the test system is started, the control circuit performs status monitoring on the test subsystem; the control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; determines the overcurrent protection level and the overcurrent allowable duration according to the difference; determines the current overcurrent duration according to the overcurrent protection level and the overcurrent allowable duration; if the current overcurrent duration exceeds the preset duration, the control circuit issues a shutdown command.

[0017] At least one of the above technical solutions adopted by the exemplary embodiment can achieve the following beneficial effects:

[0018] The exemplary embodiments of the present disclosure effectively reduce the safety risks caused by system failure or improper operation of personnel by setting a protection circuit. In addition, the protection circuit can weaken the reverse electromotive force generated when the load current changes suddenly, reduce the risk of insulation failure, and improve the stability of system operation.

[0019] It should be understood that the invention summary is not intended to identify the key or essential features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of some embodiments of the present disclosure in the accompanying drawings, in which:

[0021] Figure 1 A schematic diagram of a test system in an embodiment of the present disclosure;

[0022] Figure 2A topological diagram of a test system in an embodiment of the present disclosure;

[0023] Figure 3 This is a protection detection flow chart of the test system shutdown in the embodiment of the present disclosure;

[0024] Figure 4 This is a flow chart of protection detection during the test system runtime in the embodiment of the present disclosure;

[0025] Figure 5 This is a flow chart of the abnormal current dynamic protection strategy for the test system in the embodiment of the present disclosure;

[0026] Figure 6 This is a flow chart of the dynamic overcurrent protection strategy for the over-test system in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] The principle of the present disclosure will now be described with reference to some embodiments. It should be understood that the description of these embodiments is only for illustrative purposes, and helps those skilled in the art to understand and implement the present disclosure, without any limitation to the scope of the present disclosure. The disclosure described herein can be implemented in a manner different from that described below.

[0028] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0029] References in this disclosure to "one embodiment," "an embodiment," "an exemplary embodiment," etc. indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure, or characteristic is described in conjunction with an exemplary embodiment, whether or not explicitly described, those skilled in the art will recognize that such feature, structure, or characteristic affects incorporation into other embodiments.

[0030] It should be understood that although the terms "first" and "second" etc. may be used to describe various elements herein, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the exemplary embodiments, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term "and / or" as used herein includes any and all combinations of one or more of the listed terms.

[0031] The terms used herein are only for describing specific embodiments, rather than for limiting exemplary embodiments. The singular forms "one", "an", and "the" used herein also include plural forms, unless the context clearly indicates otherwise. "A group of elements" or "element set" used herein is intended to include one or more elements. It should also be understood that the terms "include", "comprise", "have", "have", "include" and / or "include", when used herein, specify the presence of the features, elements and / or parts, etc., but do not exclude the presence or addition of one or more other features, elements, parts and / or combinations thereof.

[0032] As used in this disclosure, the term "circuitry" may refer to one or more or all of the following:

[0033] (a) Hardware circuit implementation only (e.g., implementation only in analog and / or digital circuits)

[0034] (b) a combination of hardware circuitry and software, such as (where applicable):

[0035] (i) a combination of analog and / or digital hardware circuits and software / firmware; and

[0036] (ii) any portion of a hardware processor (including a digital signal processor) with software, software and memory that work together to enable a device such as a mobile phone or server to perform various functions, and

[0037] (c) A hardware circuit and / or processor, such as a microprocessor or portion of a microprocessor, that requires software (e.g., firmware) to operate, but where software is not required for operation, the software may not be present.

[0038] This definition of circuitry applies to all uses of this term in this disclosure, including in any claims. As another example, as used in this disclosure, the term circuitry also includes merely a hardware circuit or processor (or multiple processors) or a portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware implementation. The term circuitry also includes, for example, if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing network device.

[0039] The term "control terminal" refers to any terminal device capable of wired or wireless communication. As an example and not a limitation, the terminal device may also be referred to as a communication device, user equipment (UE), user station (SS), portable user station, mobile station (MS) or access terminal (AT). The terminal device may include but is not limited to mobile phones, cellular phones, smart phones, voice over IP (VoIP) phones, wireless local loop phones, tablet computers, wearable terminal devices, personal digital assistants (PDAs), portable computers, desktop computers, image capture terminal devices such as digital cameras, game terminal devices, music storage and playback devices, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, notebook embedded devices (LEEs), notebook computer installation devices (LMEs), USB dongles, smart devices, wireless user equipment (CPEs), Internet of Things (IoT) devices, watches or other wearable devices, head-mounted displays (HMDs), vehicles, drones, medical devices and applications (e.g., remote surgery), industrial devices and applications (e.g., robots and / or other wireless devices operating in industrial and / or automated processing chain contexts), consumer electronic devices, relay nodes, devices operating on commercial and / or industrial wireless networks, etc. The mobile terminal (MT) part of the IAB node can perform the functions of a "terminal device" and can therefore operate as a terminal device. In the following description, the terms "terminal device", "communication device", "terminal", "user equipment" and "UE" can be used interchangeably.

[0040] Although the functions described herein may be performed in fixed and / or wireless network nodes in various exemplary embodiments, in other exemplary embodiments, the functions may be implemented in a user equipment device (such as a cellular phone, or a tablet computer, or a laptop computer, or a desktop computer, or a mobile Internet of Things device, or a fixed Internet of Things device). For example, the user equipment device may appropriately have the corresponding capabilities described in relation to fixed and / or wireless network nodes. The user equipment device may be a user device and / or a control device, such as a chipset or a processor, which is configured to control the user device when the user device is installed therein. Examples of these functions include boot server functions and / or home user servers, which may be implemented in a user equipment device by providing the user equipment device with software configured to cause the user equipment device to execute from the perspective of these functions / nodes.

[0041] In the exemplary embodiment, in response to the current situation in the related art that the protection circuit performance in the test system of the energy storage inverter power unit is low and the protection means are single, a test system with strong universality is designed. The test system utilizes the AC side protection circuit and the DC side protection circuit to effectively protect the test platform through the integration of hardware and software, thereby improving the system operation stability.

[0042] The technical solutions provided by various embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings.

[0043] The disclosed embodiments provide a test method, a test system and an energy storage and current conversion power unit. Figure 1 As shown, a schematic diagram of a test system 100 in an embodiment of the present disclosure is provided, wherein the test system 100 includes: a control circuit 110 and a circuit to be tested 120, wherein the circuit to be tested 120 includes a test subsystem 1201-120N of multiple energy storage and current conversion power units, wherein the test subsystem includes an AC side protection circuit and a DC side protection circuit; the energy storage and current conversion power unit is connected to a rectifier module via the DC side protection circuit, and is connected to a load module via the AC side protection circuit; the control circuit is used to collect preset parameter information in the test subsystem, and generate a corresponding protection strategy according to the preset parameter information through preset judgment rules. The DC power supply of the test system adopts three-phase AC power obtained through a rectifier module, and each power unit is cascaded on the AC side, and a high-power reactor is used as the load. When the system is started, the control circuit sends a drive signal to each power unit to drive the power switch device to work.

[0044] It can be understood that the test system in the present application has protection circuits on the AC side and the DC side respectively for the energy storage and conversion power unit to be tested, and at the same time performs status monitoring through the control circuit, which improves the safety of the test system and the test efficiency of the (energy storage and conversion) power unit.

[0045] In some embodiments, the control circuit 110 includes a control terminal 1101, each of the energy storage conversion power units is connected to a DC side protection circuit, and the DC side protection circuit includes at least one of the following: a DC circuit breaker, a DC fuse, a voltage sensor, and an insulation detection sensor; the DC circuit breaker and the DC fuse are used to disconnect the DC circuit to prevent overcurrent from damaging the test system. The voltage sensor is used to collect the voltage value of the DC side protection circuit; the insulation detection sensor is used to collect the insulation value of the DC side protection circuit.

[0046] refer to Figure 1 , Figure 2, the test system includes a power supply line and a communication line. A DC circuit breaker is connected to the power supply line of the test subsystem, and a DC circuit breaker is set in each test subsystem so as to control each power unit to be tested separately, further ensuring the safety of the test. In addition, a fuse is also set on the DC side power supply line of each test subsystem to protect the circuit from overload and short-circuit current. When the current in the circuit exceeds the specified value, the fuse will melt the fuse through the heat generated by itself, thereby disconnecting the circuit to prevent the equipment from being damaged by overload or short circuit. A voltage detection (voltage sensor) and an insulation detection module (insulation detection sensor) are provided on the communication line on the DC side of the test system. The control terminal can obtain the voltage value of the DC side power supply line of the power unit through voltage detection; the DC side of each unit is equipped with a voltage detection module to send information to the control terminal in real time. When the DC voltage is undervoltage or overvoltage, the main circuit is disconnected in time and the system is prohibited from running to prevent short circuit or reverse overvoltage of the rectifier bridge. The insulation detection module is used to measure the insulation impedance value of the DC bus to the ground in real time and send the insulation impedance value to the control terminal. When the insulation impedance value is lower than the specified threshold, the terminal will disconnect the main circuit in time and prohibit the system operation to prevent breakdown discharge or short circuit.

[0047] A plurality of the energy storage and conversion power units are connected to the same AC side protection circuit, and the AC side protection circuit includes one of the following: an AC circuit breaker, an AC fuse, a current sensor, and a temperature sensor; the AC circuit breaker and the AC fuse are used to disconnect the AC circuit to prevent overcurrent from damaging the test system, and are also used to avoid circuit breakdown caused by the reverse electromotive force generated when the current of the load module changes suddenly; the current sensor is used to collect the current value in the AC side protection circuit; the temperature sensor is used to collect the temperature value of the load module.

[0048] Continue to refer Figure 1 , Figure 2In the test subsystem, all power units are connected to the same load. AC circuit breakers and fuses are set on the AC power supply line. The AC circuit breaker includes overload protection, short circuit protection, leakage protection and manual control functions. The fuse is used to prevent the equipment from damaging the test system due to overload or short circuit. Both the AC circuit breaker and the fuse are connected to the control terminal through the communication line. A Hall sensor (sensor) is also set on the AC power supply line to collect the current information on the AC side. The AC circuit breaker and the AC fuse are used to perform hardware protection when the load has an overcurrent; and the AC circuit breaker can also isolate the reverse electromotive force generated by the reactor when the large current suddenly changes, so as to avoid the transmission of this reverse electromotive force to the power unit to cause the danger of breakdown. The Hall sensor is connected to the control terminal through the communication line. A temperature control probe (temperature sensor) is set on the load of the test system, and the temperature information of the load can be detected through the control terminal. The temperature status of the load-side temperature probe and the operating status of the load cooling system are uploaded to the control terminal in real time. When the load temperature is too high or the load cooling system is malfunctioning, the main circuit is disconnected in time and the system is prohibited from running to prevent the load from burning due to overheating.

[0049] It can be understood that the control terminal in the control circuit can detect the operating status and parameter information of all access units in the test system through the communication line, and operate and control all access units in the test system through control instructions. Among them, the parameter information includes at least one of the following: the voltage value and insulation value of the DC side protection circuit, and the current value and temperature value of the AC side protection circuit.

[0050] In some embodiments, the test system also includes a load cooling system, which is used to dissipate heat for the load module; when the load temperature is too high or the load cooling system operates abnormally, the main circuit is disconnected in time and the system operation is prohibited to prevent the load from overheating and burning.

[0051] The test system also includes a human presence sensor, which is configured in a high-voltage area of ​​the test system. When a person is detected in the high-voltage area, the controller promptly disconnects the main circuit and prohibits system operation to prevent electric shock.

[0052] The protection strategy includes at least one of the following: a software protection strategy, a current abnormality dynamic protection strategy, and an overcurrent dynamic protection strategy.

[0053] In some embodiments, the software protection strategy includes: status monitoring of the test subsystem; the status monitoring includes at least one of the following: DC circuit breaker status, AC circuit breaker status, DC fuse status, AC fuse status, voltage sensor status, current sensor status, temperature sensor status, loop impedance, load cooling system status, load module temperature.

[0054] The software protection strategy is applied to the test system before the system is started, during the system operation and when the system is shut down. It continuously monitors whether there is someone in the vicinity, DC side voltage, insulation impedance, load temperature and cooling system. When the corresponding detection module is normal, the system allows the start command and drive signal to run; otherwise, the control circuit will not be allowed to issue the operation command and drive signal, and alarms will be issued for the related abnormal parts.

[0055] Figure 3 In the software protection strategy, low-voltage simulation mode and no-load mode are included. In low-voltage simulation mode, the DC side of the system is not connected to high voltage operation, which is used to test whether the power unit operation logic is normal. At this time, it is necessary to detect that the DC circuit breaker has been separated and the DC voltage is 0, otherwise the start command is not allowed. In this mode, the high-voltage area is not connected to high voltage, so personnel are allowed to enter, and there is no need to detect the load side status. It should be pointed out that the no-load mode means that the DC side of the system is connected to high voltage, and the AC side is not connected to the load, which can be used to test the insulation performance of the power unit. At this time, it is necessary to detect that the AC circuit breaker has been separated, otherwise the start command is not allowed.

[0056] In one example, when the software protection strategy is executed, first confirm whether it is in low-voltage simulation mode. If so, detect whether the DC circuit breaker is separated. If the DC circuit breaker is separated, detect whether the DC voltage is zero. If the DC voltage is zero at this time, it means that the system is normal, and the test system is allowed to issue a run command. In the low-voltage simulation mode, if the DC circuit breaker is not separated, the test system issues a DC side circuit breaker opening command, and the test system issues an abnormal warning. If the low-voltage simulation mode is not entered, the DC voltage and insulation impedance are detected. If both are normal, the no-load mode is entered. In the no-load mode, the AC circuit breaker is separated, indicating that the system is running normally and allowing the issuance of a run command. If it is not in no-load mode or the AC circuit breaker is closed, detect whether the test system is loaded, and detect whether the AC circuit breaker is closed. If the test system is not loaded and the AC circuit breaker is not closed, the test system will issue an abnormal reminder. If the test system is loaded and the AC circuit breaker is closed, the load temperature and load cooling system are detected respectively, and the detection results are obtained, and corresponding operations are performed according to the detection results.

[0057] like Figure 4 As shown in the figure, the software protection strategy of the system during operation continuously monitors whether there is someone nearby, DC side voltage, insulation resistance, load temperature and cooling system. When the corresponding detection module is normal, the system continues to run; otherwise, it will issue a shutdown command, a DC circuit breaker opening command and an AC circuit breaker opening command, and alarm for related abnormal parts. The processing flow of the test system can refer to Figure 3 The description of the process will not be repeated here.

[0058] It can be understood that the software protection strategy can detect abnormal conditions in the system in a timely manner, perform corresponding operations, and issue timely reminders to ensure the safe operation of the system.

[0059] In some embodiments, the current anomaly dynamic protection strategy includes: after the test system is started, the control circuit monitors the status of the test subsystem; the control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; if the deviation is greater than the preset time length, the control circuit issues a shutdown command.

[0060] like Figure 5 As shown, since the load in the test system is a high-power inductor, a too fast current change can easily cause overshoot and overvoltage, so the actual current command adopts a step change. Specify a more appropriate current change step size within the control cycle, calculate the number of steps required to change from the current current to the given current command, and then gradually change the actual current command; start timing after updating the actual current command, and after the specified time, it can be determined that the system is abnormal (such as the signal of the current (Hall) sensor is disconnected, the switching device of the power unit body is abnormal), where |actual current value|<|actual current command-allowable error|. At this time, the operation should be stopped; otherwise, the step operation continues. Since the step size of each step is fixed, the dynamic change time of the current, that is, the timer cycle in the strategy, is easy to determine.

[0061] In some embodiments, the current overcurrent dynamic protection strategy includes: after the test system is started, the control circuit monitors the status of the test subsystem; the control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; determines the overcurrent protection level and the overcurrent allowable duration according to the difference; determines the current overcurrent duration according to the overcurrent protection level and the overcurrent allowable duration; if the current overcurrent duration exceeds the preset duration, the control circuit issues a shutdown command.

[0062] like Figure 6 As shown in the figure, since the AC voltage output by the test platform cascade unit is not smooth enough, the current waveform may have spikes that do not affect the safety of the system. For this reason, three overcurrent protection levels are set. Each level has a certain overcurrent tolerance time. If the actual current maintenance time exceeds this tolerance time, the system will stop running, otherwise it will continue to run. This strategy uses a combination of timers and counters to achieve different levels of overcurrent protection, and the larger the overcurrent value, the shorter the overcurrent tolerance time. The relationship between the three protection coefficients in the figure is: overcurrent protection coefficient 3> overcurrent protection coefficient 2> overcurrent protection coefficient 1.

[0063] The current level step is related to the current level overcurrent allowable maintenance time, as follows:

[0064] Step 3 = (current overcurrent count setting value × timer timing cycle) / current level overcurrent allowable maintenance time;

[0065] Step 2 = (current overcurrent count setting value × timer timing cycle) / current level overcurrent allowable maintenance time;

[0066] Step 1 = (current overcurrent count setting value × timer timing cycle) / current level overcurrent allowable maintenance time;

[0067] In one example, if the timer timing period is 1ms, the current overcurrent count setting value is 100, and the three levels of overcurrent allowable time are 10ms, 20ms, and 50ms respectively, then it can be calculated that step 3 is 10, step 2 is 5, and step 1 is 2.

[0068] Since the current overcurrent counter is shared among the three protection levels, when the actual current value fluctuates between multiple overcurrent thresholds, for example, the overcurrent protection factor 1 is 1.1 and the overcurrent protection factor 2 is 1.2, the actual current value (according to the current instruction scalar) fluctuates between 1.1 and 1.25. The actual overcurrent allowable time is shorter than the allowable time of level 1 and longer than the allowable time of level 2, thus achieving adaptive protection.

[0069] When the current is within the allowable range for a period of time, the current normal counter will be continuously accumulated during this period. The current normal count setting value = the time to judge the current is normal / the timer timing cycle. In one example, when the current is maintained for 1s, the current is judged to be normal. At this time, the current normal count setting value = 1000 / 1 = 1000. When the current is judged to be normal, the current overcurrent counter will be cleared to avoid occasional current spikes causing the accumulation of the current overcurrent counter.

[0070] In some embodiments, in addition to the overcurrent dynamic protection, the test system also includes overcurrent rapid shutdown protection. In one example, the Hall current is monitored in real time, and the system operation is stopped immediately when the current is greater than a specified value. The specified value is greater than the corresponding protection value of the overcurrent dynamic protection.

[0071] It can be understood that the present disclosure adopts cascaded energy storage and current conversion power units and runs with high-power load testing, which can improve the test efficiency of the power units and improve the comprehensiveness of the test conditions. This system can provide effective circuit protection for the combination of cascaded units + high-power loads under high-voltage and high-current conditions, reducing the safety risks caused by system failures or improper operation of personnel, and reducing the risk of insulation failure; it also proposes two current dynamic protection logics for the situation of large current fluctuations caused by actual operation to improve the stability of system operation.

[0072] The present disclosure also provides an energy storage and current conversion power unit, which is tested using the test system as described above.

[0073] The present disclosure also provides a test method for an energy storage inverter power unit, which is applied to the test system as described above, and the test method includes: monitoring the state of the test subsystem to obtain the state monitoring result, wherein the state monitoring includes at least one of the following: DC circuit breaker state, AC circuit breaker state, DC fuse state, AC fuse state, voltage sensor state, current sensor state, temperature sensor state, loop impedance, load cooling system state, load module temperature, wherein the loop impedance indicates the insulation impedance of the system main loop to the ground; in response to the state monitoring result meeting the preset condition, starting the test system and adopting the current abnormality dynamic protection strategy and the overcurrent dynamic protection strategy for the test system, wherein the current abnormality dynamic protection strategy includes: after the test system is started, the control circuit The test subsystem performs status monitoring; the control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; if the deviation is greater than the preset duration, the control circuit issues a shutdown command; the current overcurrent dynamic protection strategy includes: after the test system is started, the control circuit performs status monitoring on the test subsystem; the control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; determines the overcurrent protection level and the overcurrent allowable duration according to the difference; determines the current overcurrent duration according to the overcurrent protection level and the overcurrent allowable duration; if the current overcurrent duration exceeds the preset duration, the control circuit issues a shutdown command. Please refer to the above description for a detailed description of the test method, which will not be repeated here.

[0074] It should be noted that various embodiments of the present disclosure may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Certain aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor, or other computing device. Although various aspects of the embodiments of the present disclosure are shown and described as block diagrams, flow charts, or using some other graphical representations, it should be understood that, as non-limiting examples, the blocks, devices, systems, techniques, or methods described herein may be implemented in hardware, software, firmware, dedicated circuits or logic, general hardware or controllers or other computing devices, or some combination thereof.

[0075] The present disclosure also provides at least one computer program product tangibly stored on a non-transient computer-readable storage medium. The computer program product includes computer executable instructions, such as instructions included in program modules, which are executed in a device on a target real or virtual processor. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform specific tasks or implement specific abstract data types. In various embodiments, the functions of program modules can be combined or separated between program modules as needed. Machine executable instructions for program modules can be executed in local or distributed devices. In distributed devices, program modules can be located in local and remote storage media.

[0076] The program code for executing the disclosed method can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer or other programmable data processing equipment so that when the program code is executed by the processor or controller, the function / operation specified in the flow chart and / or block diagram is realized. The program code can be executed completely on the machine as an independent software package, partially on the machine, partially on the machine, partially on a remote machine, partially on a remote machine, or all on a remote machine or server.

[0077] In the context of the present disclosure, computer program codes or related data may be carried by any appropriate carrier to enable a device, apparatus or processor to perform various processes and operations as described above. Examples of carriers include signals, computer readable media, etc.

[0078] The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or apparatuses, or any suitable combination of the foregoing. More specific examples of computer readable storage media include an electrical connection with one or more wires, a portable computer floppy disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0079] In addition, although the operations are described in a specific order, this should not be understood as requiring the specific order or sequence shown to be performed, or performing all the operations shown, to obtain the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these details should not be interpreted as limitations on the scope of the present disclosure, but can be interpreted as descriptions of features specific to a particular embodiment. Certain features described in the context of a separate embodiment may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0080] Although the disclosure has been described in language specific to structural features and / or methodological acts, it should be understood that the disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

[0081] It should be fully understood that the use of personally identifiable information should be subject to privacy policies and practices generally recognized as meeting or exceeding industry or government requirements for maintaining user privacy. In particular, personally identifiable information data should be managed and processed to minimize the risk of inadvertent or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.

Claims

1. A testing system, characterized in that: The test system comprises: A control circuit and a circuit to be tested, wherein the circuit to be tested includes a plurality of test subsystems, wherein the test subsystems are used for testing the energy storage and current conversion power unit, and the test subsystems include an AC side protection circuit and a DC side protection circuit; The energy storage and conversion power unit is connected to the rectifier module through the DC side protection circuit, and is connected to the load module through the AC side protection circuit; The control circuit is used to collect preset parameter information in the test subsystem, and generate a corresponding protection strategy according to the preset parameter information through preset determination rules.

2. The test system according to claim 1, characterized in that: Each of the energy storage and conversion power units is connected to a DC side protection circuit, and the DC side protection circuit includes at least one of the following: a DC circuit breaker, a DC fuse, a voltage sensor, and an insulation detection sensor; The DC circuit breaker and the DC fuse are used to disconnect the DC circuit to prevent overcurrent from causing damage to the test system; The voltage sensor is used to collect the voltage value of the DC side protection circuit; The insulation detection sensor is used to collect the insulation value of the DC side protection circuit.

3. The test system according to claim 1, characterized in that: A plurality of the energy storage and current conversion power units are connected to the same AC side protection circuit, and the AC side protection circuit includes one of the following: an AC circuit breaker, an AC fuse, a current sensor, and a temperature sensor; The AC circuit breaker and AC fuse are used to disconnect the AC circuit to prevent overcurrent from damaging the test system, and are also used to avoid circuit breakdown caused by reverse electromotive force generated when the current of the load module changes suddenly; The current sensor is used to collect the current value in the AC side protection circuit; The temperature sensor is used to collect the temperature value of the load module.

4. A test system as claimed in any one of claims 1 to 3, characterized in that: The preset parameter information includes at least one of the following: a voltage value and an insulation value of a DC side protection circuit, and a current value and a temperature value of an AC side protection circuit.

5. The test system according to claim 4, characterized in that: The test system further comprises a load heat dissipation system, and the load heat dissipation system is used to dissipate heat for the load module; The protection strategy includes at least one of the following: a software protection strategy, a current abnormality dynamic protection strategy, and an overcurrent dynamic protection strategy.

6. The test system according to claim 5, characterized in that: The software protection strategy includes: Status monitoring of the test subsystem; the status monitoring includes at least one of the following: DC circuit breaker status, AC circuit breaker status, DC fuse status, AC fuse status, voltage sensor status, current sensor status, temperature sensor status, loop impedance, load cooling system status, load module temperature.

7. The test system according to claim 5, characterized in that: The abnormal current dynamic protection strategy includes: After the test system is started, the control circuit performs status monitoring on the test subsystem; The control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; If the deviation is greater than a preset time, the control circuit issues a shutdown instruction.

8. The test system according to claim 5, characterized in that: The current overcurrent dynamic protection strategy includes: After the test system is started, the control circuit performs status monitoring on the test subsystem; The control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; Determine the overcurrent protection level and the overcurrent allowable duration according to the difference; Determining the current overcurrent duration according to the overcurrent protection level and the overcurrent allowable duration; If the current overcurrent duration exceeds a preset duration, the control circuit issues a shutdown instruction.

9. An energy storage and current conversion power unit, characterized in that: The test is performed using a test system as described in any one of claims 1 to 8.

10. A method for testing an energy storage power conversion unit, characterized in that: Applied to the test system as claimed in any one of claims 1 to 8, the test method comprises: Performing status monitoring on the test subsystem and obtaining status monitoring results, wherein the status monitoring includes at least one of the following: DC circuit breaker status, AC circuit breaker status, DC fuse status, AC fuse status, voltage sensor status, current sensor status, temperature sensor status, loop impedance, load cooling system status, and load module temperature; In response to the state monitoring result satisfying a preset condition, the test system is started and a current abnormality dynamic protection strategy and an overcurrent dynamic protection strategy are adopted for the test system, wherein the current abnormality dynamic protection strategy includes: After the test system is started, the control circuit performs status monitoring on the test subsystem; The control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; If the deviation is greater than a preset time, the control circuit issues a shutdown command; The current overcurrent dynamic protection strategy includes: After the test system is started, the control circuit performs status monitoring on the test subsystem; The control circuit monitors the deviation between the actual current value and the command current value in the test subsystem according to the set current value change step and time window; Determine the overcurrent protection level and the overcurrent allowable duration according to the difference; Determining the current overcurrent duration according to the overcurrent protection level and the overcurrent allowable duration; If the current overcurrent duration exceeds a preset duration, the control circuit issues a shutdown instruction.

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