Test system of energy storage converter power unit

Abstract

The utility model provides a test system of an energy storage converter power unit. The test system comprises a control circuit and a to-be-tested circuit, the control circuit is in communication connection with the to-be-tested circuit, the to-be-tested circuit comprises a plurality of test subsystems, each test subsystem comprises an energy storage variable current power unit and a direct current side protection circuit, and the plurality of test subsystems share an alternating current protection circuit; the energy storage conversion power unit is connected to an AC power supply through the DC side protection circuit, and is connected to a load module through the AC side protection circuit. 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] This disclosure relates to the field of energy storage technology, and in particular to a test system for an energy storage converter power unit. Background Technology

[0002] The basic topology of cascaded high-voltage direct-connected energy storage consists of numerous power conversion units connected in series. The manufactured power conversion units must undergo rigorous quality inspection and performance testing to ensure their functionality and safety in practical applications. After each component passes testing, they need to be assembled into a complete energy storage system. System-level testing is then conducted to verify the system's performance and stability under various operating conditions.

[0003] In related technologies, the testing method for energy storage converter power units involves operating and testing a single power unit. During testing, inadequate circuit protection leads to low testing efficiency and a low pass rate.

[0004] It should be noted that the statements herein provide background information in connection with this disclosure only and do not necessarily constitute prior art. Utility Model Content

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

[0006] The embodiments disclosed herein employ the following technical solutions:

[0007] In a first aspect, a test system for an energy storage converter power unit is provided. The test system includes a control circuit and a circuit under test (DUT). The control circuit is communicatively connected to the DUT. The DUT includes multiple test subsystems, each of which includes an energy storage converter power unit and a DC-side protection circuit. The multiple test subsystems share an AC protection circuit. The energy storage converter power unit is connected to an AC power source through the DC-side protection circuit and to a load module through the AC-side protection circuit.

[0008] Preferably, the control circuit includes a control terminal, and each of the energy storage converter power units is connected to a DC-side protection circuit. 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, the DC fuse, the voltage sensor, and the insulation detection sensor are connected to the DC power supply cable in the test subsystem and are communicatively connected to the control terminal.

[0009] Preferably, 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, the AC fuse, the current sensor, and the temperature sensor are connected to the AC load circuit in the test subsystem and are communicatively connected to the control terminal.

[0010] Preferably, each test subsystem includes a rectifier module, the input of which is connected to an AC power supply, and the output of which is connected to the DC circuit breaker.

[0011] Preferably, the circuit under test further includes a load, the load including a high-power reactor; a temperature sensor is provided on the load, and the temperature sensor is communicatively connected to the control terminal.

[0012] Preferably, the test system further includes a load cooling system, which is communicatively connected to the control terminal.

[0013] Preferably, the energy storage converter power unit in each of the test subsystems is cascaded in the circuit under test. The circuit under test also includes a human sensor, which is communicatively connected to the control circuit.

[0014] The above-described at least one technical solution adopted in the exemplary embodiment can achieve the following beneficial effects:

[0015] Exemplary embodiments of this disclosure effectively reduce safety risks arising from system failures or improper human operation by incorporating protection circuits. Furthermore, the protection circuits can mitigate the back electromotive force generated during sudden changes in load current, reducing the risk of insulation failure and improving system operational stability.

[0016] It should be understood that the summary section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0017] The above and other objects, features, and advantages of this disclosure will become more apparent from the more detailed description of some embodiments thereof in the accompanying drawings, in which:

[0018] Figure 1 This is a schematic diagram of the test system in an embodiment of this disclosure;

[0019] Figure 2 This is a test system topology diagram in an embodiment of this disclosure;

[0020] Figure 3 This is a flowchart of the protection detection process when the test system is shut down, as shown in this embodiment of the present disclosure.

[0021] Figure 4 This is a flowchart of the protection detection process during the operation of the test system in this embodiment of the disclosure;

[0022] Figure 5 This is a flowchart of the dynamic protection strategy for abnormal current in the test system in this embodiment of the present disclosure;

[0023] Figure 6 This is a flowchart of the overcurrent dynamic protection strategy of the test system in an embodiment of this disclosure. Detailed Implementation

[0024] The principles of this disclosure will now be described with reference to some embodiments. It should be understood that these embodiments are described for illustrative purposes only and to assist those skilled in the art in understanding and implementing this disclosure, and do not impose any limitation on the scope of this disclosure. The disclosure described herein may be implemented in ways other than those described below.

[0025] In the following description and claims, unless otherwise defined, 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 pertains.

[0026] References to "an embodiment," "embodiment," "exemplary embodiment," etc., in this disclosure indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment needs to include specific features, structures, or characteristics. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an exemplary embodiment, whether explicitly described or not, those skilled in the art will recognize that such a feature, structure, or characteristic affects its connection to other embodiments.

[0027] It should be understood that while the terms “first” and “second”, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. 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.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. The singular forms “a,” “an,” and “the” used herein also include the plural forms unless the context clearly indicates otherwise. The terms “a group of elements” or “a collection of elements” as used herein are intended to include one or more elements. It should also be understood that the terms “comprising,” “including,” “having,” “possessing,” “including,” and / or “comprising,” when used herein, specify the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0029] As used in this disclosure, the term "circuit" may refer to one or more of the following:

[0030] (a) Implemented only in hardware circuitry (e.g., implemented only in analog and / or digital circuitry)

[0031] (b) A combination of hardware circuitry and software, such as (if applicable):

[0032] (i) a combination of analog and / or digital hardware circuitry with software / firmware; and

[0033] (ii) Any part of a hardware processor (including a digital signal processor), software, and memory that work together to enable a device such as a mobile phone or server to perform various functions, and

[0034] (c) Hardware circuitry and / or processors, such as microprocessors or a portion thereof, which require software (e.g., firmware) to operate, but may be absent when the software is not required to operate.

[0035] The definition of "circuit" applies to all uses of the term in this disclosure, including in any claim. As another example, as used in this disclosure, the term "circuit" also includes implementations of hardware circuitry or a processor (or processors) or a portion thereof and its accompanying software and / or firmware. The term "circuit" also includes, for example, 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, if applicable to a particular claim element.

[0036] The term "control terminal" refers to any terminal device capable of wired or wireless communication. As an example and not a limitation, a terminal device may also be referred to as a communication device, user equipment (UE), subscriber station (SS), portable subscriber station, mobile station (MS), or access terminal (AT). This terminal device may include, but is not limited to, mobile phones, cellular phones, smartphones, Voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable terminal devices, personal digital assistants (PDAs), portable computers, desktop computers, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback devices, in-vehicle wireless terminal devices, wireless endpoints, mobile stations, laptop embedded devices (LEEs), laptop installed devices (LMEs), USB dongles, smart devices, wireless subscriber 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 the context of industrial and / or automated processing chains), consumer electronics devices, relay nodes, devices operating on commercial and / or industrial wireless networks, etc. The mobile terminal (MT) portion of an IAB node can perform the functions of a "terminal device" and therefore can operate as a terminal device. In the following description, the terms "terminal device," "communication device," "terminal," "user equipment," and "UE" are used interchangeably.

[0037] While the functions described herein may be implemented in fixed and / or wireless network nodes in various exemplary embodiments, in other exemplary embodiments, they may be implemented in user equipment devices (such as cellular phones, tablet computers, laptop computers, desktop computers, mobile IoT devices, or fixed IoT devices). For example, the user equipment device may suitably have the corresponding capabilities described in relation to fixed and / or wireless network nodes. The user equipment device may be user equipment and / or control devices, such as chipsets or processors, configured to control the user equipment when it is installed therein. Examples of these functions include boot server functions and / or home subscriber servers, which may be implemented in the user equipment device by providing the user equipment device with software configured to cause the user equipment device to perform from the perspective of these functions / nodes.

[0038] In an exemplary embodiment, in view of the current situation that the protection circuit performance of the test system of energy storage converter power unit in the related art is low and the protection method is simple, a test system with strong universality is designed. The test system uses AC side protection circuit and DC side protection circuit to effectively protect the test platform through hardware and software integration, thereby improving the system operation stability.

[0039] The technical solutions provided by the embodiments of this disclosure are described in detail below with reference to the accompanying drawings.

[0040] The disclosed embodiments provide a test system for an energy storage converter power unit. For example... Figure 1 The diagram shows a schematic of a test system 100 in this embodiment of the present disclosure. The test system 100 includes a control circuit 110 and a circuit under test (DUT) 120. The DUT 120 includes multiple test subsystems 1201-120N for testing energy storage converter power units. Each test subsystem includes an energy storage converter power unit and a DC-side protection circuit. The multiple test subsystems share an AC protection circuit. The energy storage converter power unit is connected to an AC power source through the DC-side protection circuit and to a load module through the AC-side protection circuit. The control circuit is used to collect preset parameter information in the test subsystems and generate corresponding protection strategies based on the preset parameter information and preset judgment rules. The DC power source of the test system is obtained by rectifying three-phase AC power through a rectifier module. The AC sides of each power unit are cascaded, and the load uses a high-power reactor. When the system starts, the control circuit sends a drive signal to each power unit to drive the power switching devices. The energy storage converter power unit in each test subsystem is cascaded in the DUT.

[0041] It is understood that the test system in this application sets up protection circuits on both the AC and DC sides of the energy storage converter power unit under test, and monitors the status through the control circuit, thereby improving the safety of the test system and the test efficiency of the (energy storage converter) power unit.

[0042] In some embodiments, the control circuit includes a control terminal, and each energy storage converter power unit is connected to a DC-side protection circuit. 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, the DC fuse, the voltage sensor, and the insulation detection sensor are connected to the DC power supply cable in the test subsystem and are communicatively connected to the control terminal. 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.

[0043] refer to Figure 1 , Figure 2The test system includes power supply lines and communication lines. DC circuit breakers are connected to the power supply lines of the test subsystems, with one DC circuit breaker installed in each subsystem to allow for individual control of each power unit under test, further ensuring test safety. Additionally, fuses are installed on the DC power supply lines of each test subsystem to protect the circuit from overload and short-circuit current damage. When the current in the circuit exceeds a specified value, the fuse will melt its element through its own heat, thus breaking the circuit and preventing damage to the equipment due to overload or short circuit. Voltage detection (voltage sensor) and insulation detection modules (insulation detection sensors) are installed on the DC communication lines of the test system. The control terminal can obtain the voltage value of the DC power supply lines of the power units through voltage detection; each unit's DC side is equipped with a voltage detection module that sends information to the control terminal in real time. In the event of DC voltage undervoltage or overvoltage, the main circuit is disconnected and the system operation is prohibited to prevent short circuits or reverse overvoltage of the rectifier bridge. The insulation detection module is used to measure the insulation resistance value of the DC bus to ground in real time and send the insulation resistance value to the control terminal. When the insulation resistance value is lower than the specified threshold, the terminal disconnects the main circuit and prohibits the system from running in time to prevent breakdown discharge or short circuit.

[0044] Multiple energy storage converter power units are connected to the same AC-side protection circuit, which includes an AC circuit breaker, an AC fuse, a current sensor, and a temperature sensor. The AC circuit breaker, AC fuse, current sensor, and temperature sensor are connected to the AC load circuit in the test subsystem and are communicatively connected to the control terminal. The AC circuit breaker and AC fuse are used to disconnect the AC circuit, preventing overcurrent damage to the test system and avoiding circuit breakdown caused by the back electromotive force generated when the current of the load module changes abruptly. 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. Each test subsystem includes a rectifier module, the input of which is connected to the AC power supply, and the output of which is connected to the DC circuit breaker.

[0045] Continue to refer to Figure 1 , Figure 2In the test subsystem, all power units are connected to the same load, which includes a high-power reactor. A temperature sensor is installed on the load and is communicatively connected to the control terminal. An AC circuit breaker and a fuse are installed 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 damage to the test system due to overload or short circuit. Both the AC circuit breaker and the fuse are connected to the control terminal via communication lines. A Hall effect sensor is also installed on the AC power supply line to collect AC current information. The AC circuit breaker and AC fuse provide hardware protection when the load experiences overcurrent; furthermore, the AC circuit breaker can isolate the back electromotive force generated by the reactor during large current surges, preventing this back electromotive force from being transmitted to the power unit and causing a breakdown hazard. The Hall effect sensor is connected to the control terminal via communication lines. A temperature probe (temperature sensor) is installed on the load of the test system, and the temperature information of the load can be detected through the control terminal. The test system also includes a load cooling system, which is communicatively connected to the control terminal. The temperature status of the load-side temperature probe and the operating status of the load heat dissipation system are uploaded to the control terminal in real time. When the load temperature is too high or the load heat dissipation system is malfunctioning, the main circuit is disconnected and the system is prohibited from running in time to prevent the load from burning out due to overheating.

[0046] It is understood that the control terminal in the control circuit can detect the operating status and parameter information of all connected units in the test system through the communication line, and control all connected units in the test system through control commands. The parameter information includes at least one of the following: the voltage and insulation values ​​of the DC side protection circuit, and the current and temperature values ​​of the AC side protection circuit.

[0047] In some embodiments, the test system further includes a load cooling system for cooling the load module; when the load temperature is too high or the load cooling system malfunctions, the main circuit is disconnected and the system is prohibited from running in a timely manner to prevent the load from overheating and burning out.

[0048] The testing system also includes a human sensor, which is positioned in the high-voltage area of ​​the circuit under test and is communicatively connected to the control circuit.

[0049] A human presence sensor is installed in the 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 disables the system to prevent electric shock.

[0050] The protection strategy includes at least one of the following: software protection strategy, current anomaly dynamic protection strategy, and overcurrent dynamic protection strategy.

[0051] 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 heat dissipation system status, and load module temperature. Wherein, loop impedance indicates the insulation impedance of the system main circuit to ground.

[0052] The software protection strategy is applied to protect the test system before startup, during system operation, and during system shutdown. It continuously monitors factors such as the presence of personnel nearby, DC-side voltage, insulation resistance, load temperature, and heat dissipation system. When the corresponding detection module is functioning normally, the system allows the issuance of startup commands and drive signals for operation; otherwise, the control circuit will not be allowed to issue operation commands and drive signals, and alarms will be issued for any related abnormalities.

[0053] Figure 3 The software protection strategy includes a low-voltage simulation mode and an no-load mode. In low-voltage simulation mode, the system operates without high voltage on the DC side to test the operational logic of the power unit. In this mode, the DC circuit breaker must be open and the DC voltage must be zero; otherwise, a start command is not allowed. In this mode, the high-voltage area is not connected to high voltage, thus allowing personnel entry, and there is no need to check the load side status. It should be noted that no-load mode refers to the system's DC side being connected to high voltage, while the AC side is not connected to a load. This mode is used to test the insulation performance of the power unit. In this mode, the AC circuit breaker must be open; otherwise, a start command is not allowed.

[0054] In one example, when the software protection strategy is executed, it first checks if it is in low-voltage simulation mode. If so, it checks if the DC circuit breaker is open. If the DC circuit breaker is open, it checks if the DC voltage is zero. If the DC voltage is zero, the system is normal, and the test system is allowed to issue a run command. In low-voltage simulation mode, if the DC circuit breaker is not open, the test system issues a DC-side circuit breaker tripping command and simultaneously issues an abnormal warning. If it has not entered low-voltage simulation mode, it checks the DC voltage and insulation resistance. If both are normal, it enters no-load mode. In no-load mode, the AC circuit breaker is open, indicating normal system operation, and a run command is allowed. If it is not in no-load mode or the AC circuit breaker is closed, it checks if the test system is under load and simultaneously checks if the AC circuit breaker is closed. If the test system is not under load and the AC circuit breaker is not closed, the test system issues an abnormal warning. If the test system is under load and the AC circuit breaker is closed, it checks the load temperature and load heat dissipation system, obtains the detection results, and performs corresponding operations based on the results.

[0055] like Figure 4As shown, the system's software protection strategy continuously monitors the presence of people nearby, DC-side voltage, insulation resistance, load temperature, and heat dissipation system. When the corresponding detection module is normal, the system continues to run; otherwise, it will issue a shutdown command, a DC circuit breaker tripping command, and an AC circuit breaker tripping command, and will issue alarms for related abnormalities. The system's processing flow can be referenced from [the previous section / reference]. Figure 3 The process description will not be repeated here.

[0056] I understand that software protection strategies can detect abnormal conditions in the system in a timely manner, take corresponding actions, and provide timely reminders, thus ensuring the safe operation of the system.

[0057] In some embodiments, the current abnormality 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 commanded current value in the test subsystem according to the set current value change step size and time window; if the deviation is greater than a preset time, the control circuit issues a shutdown command.

[0058] like Figure 5 As shown, since the load in the test system is a high-power inductor, rapid current changes can easily cause overshoot and overvoltage. Therefore, the actual current command is changed in steps. A suitable current change step size is specified within the control cycle, the number of steps required for the current to change to the given current command is calculated, and then the actual current command is changed step by step. Timing begins after the actual current command is updated. After a specified time has elapsed, an anomaly can be determined (e.g., the signal from the current (Hall) sensor is disconnected, or the switching devices in the power unit malfunction). In this case, |actual current value| < |actual current command – tolerance error|. At this point, operation should stop; otherwise, step-by-step operation continues. Since the step size is fixed for each step, the dynamic change time of the current, i.e., the timer period in the strategy, is easily determined.

[0059] In some embodiments, the dynamic overcurrent 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 commanded current value in the test subsystem according to the set current value change step size and time window; determines the overcurrent protection level and the allowable overcurrent duration based on the difference; determines the overcurrent duration based on the overcurrent protection level and the allowable overcurrent duration; if the overcurrent duration exceeds a preset duration, the control circuit issues a shutdown command.

[0060] like Figure 6As shown, because the AC voltage output by the cascaded unit of the test platform is not smooth enough, the current waveform may have spikes that do not affect system safety. Therefore, three overcurrent protection levels are set, each with a certain allowable overcurrent time. If the actual current sustains for more than this allowable time, the system stops operating; otherwise, it continues to operate. 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 allowable overcurrent time. The relationship between the three protection coefficients in the figure is: overcurrent protection coefficient 3 > overcurrent protection coefficient 2 > overcurrent protection coefficient 1.

[0061] The current step size is related to the current level's allowable overcurrent sustaining time, as detailed below:

[0062] Step 3 = (Current overcurrent counter setting value × Timer timing cycle) / Current level overcurrent allowable duration;

[0063] Step 2 = (Current overcurrent counter setting value × Timer timing cycle) / Current level overcurrent allowable duration;

[0064] Step 1 = (Current overcurrent counter setting value × Timer timing cycle) / Current level overcurrent allowable duration;

[0065] In one example, if the timer period is 1ms, the overcurrent counter is set to 100, and the overcurrent tolerance times for the three levels are 10ms, 20ms, and 50ms respectively, then the step size 3 can be calculated to be 10, the step size 2 to be 5, and the step size 1 to be 2.

[0066] Since the overcurrent counter is shared across the three protection levels, when the actual current value fluctuates across multiple overcurrent thresholds, such as overcurrent protection factor 1 being 1.1 and overcurrent protection factor 2 being 1.2, the actual current value (according to the current command per unit) fluctuates between 1.1 and 1.25. The actual overcurrent allowable time is shorter than that of level 1 and longer than that of level 2, thus achieving adaptive protection.

[0067] When the current remains within the allowable range for a period of time, the current normality counter will continuously accumulate during this period. The current normality counter setpoint = current normality judgment time / timer counting period. In one example, when the current is maintained for 1 second, it is judged that the current is normal, and at this time the current normality counter setpoint = 1000 / 1 = 1000. After the current is judged to be normal, the current overcurrent counter will be reset to zero, which can prevent occasional current spikes from causing the current overcurrent counter to accumulate.

[0068] In some embodiments, in addition to dynamic overcurrent protection, the test system also includes instantaneous overcurrent protection. In one example, Hall current is monitored in real time, and the system immediately stops operating when the current exceeds a specified value. This specified value is larger than the corresponding protection value for dynamic overcurrent protection.

[0069] It is understood that this disclosure employs cascaded energy storage converter power units with high-power load testing, which improves the testing efficiency of the power units and enhances the comprehensiveness of the testing conditions. This system provides effective circuit protection for the combination of cascaded units and high-power loads under high-voltage and high-current conditions, reducing safety risks caused by system failures or improper personnel operation, and lowering the risk of insulation failure. Furthermore, it proposes two dynamic current protection logics to improve system operational stability in the face of significant current fluctuations during actual operation.

[0070] This disclosure also provides an energy storage converter power unit, which is tested using the test system described above.

[0071] This disclosure also provides a test method for an energy storage converter power unit, applied to the test system described above. The test method includes: monitoring the status of the test subsystem and obtaining the 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 heat dissipation system status, and load module temperature, wherein the loop impedance indicates the insulation impedance of the main circuit to ground; in response to the status monitoring results meeting preset conditions, starting the test system and adopting a current anomaly dynamic protection strategy and an overcurrent dynamic protection strategy for the test system, wherein the current anomaly 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 commanded current value in the test subsystem according to the set current value change step size and time window; if the deviation is greater than a preset duration, the control circuit issues a shutdown command; the dynamic overcurrent protection strategy includes: after the test system starts, the control circuit monitors the status of the test subsystem; the control circuit monitors the deviation between the actual current value and the commanded current value in the test subsystem according to the set current value change step size and time window; the overcurrent protection level and the allowable overcurrent duration are determined based on the difference; the overcurrent duration is determined based on the overcurrent protection level and the allowable overcurrent duration; if the overcurrent duration exceeds the preset duration, the control circuit issues a shutdown command. For a detailed explanation of the test method, please refer to the description above, which will not be repeated here.

[0072] It should be noted that the various embodiments of this disclosure can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while others 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 this disclosure are shown and described as block diagrams, flowcharts, or 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 circuitry or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof.

[0073] This disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions included in program modules, which execute 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 functionality of program modules can be combined or separated as needed among program modules. The machine-executable instructions for the program modules can execute within a local or distributed device. In a distributed device, the program modules can reside in both local and remote storage media.

[0074] Program code used to perform the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor or controller, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The program code may be executed entirely on a machine, partially on a machine, partially on a remote machine, partially on a remote machine, or entirely on a remote machine or server as a standalone software package.

[0075] In the context of this disclosure, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus, or processor to perform the various processes and operations described above. Examples of carriers include signals, computer-readable media, etc.

[0076] Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable media can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or apparatuses, or any suitable combination thereof. More specific examples of computer-readable storage media include electrical connections having one or more wires, portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable optical disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0077] Furthermore, although the operations are described in a specific order, this should not be construed as requiring that these operations be performed in the specific order or sequence shown, or that all of the operations shown be performed to obtain the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the foregoing discussion, these details should not be construed as limiting the scope of this disclosure, but rather as descriptions of features specific to particular embodiments. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0078] Although this disclosure has been described in language specific to structural features and / or methodological behavior, it should be understood that this disclosure as defined in the appended claims is not necessarily limited to the specific features or behaviors described above. Rather, the specific features and actions described above are disclosed as exemplary forms for implementing the claims.

[0079] It should be fully understood that the use of personally identifiable information should comply with privacy policies and practices generally considered to meet or exceed industry or governmental requirements for protecting user privacy. In particular, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to the user.

Claims

1. A test system for an energy storage converter power unit, characterized in that, The testing system includes: The circuit includes a control circuit and a circuit under test (DUT). The control circuit is communicatively connected to the DUT. The DUT includes multiple test subsystems. Each test subsystem includes an energy storage converter power unit and a DC-side protection circuit. The multiple test subsystems share an AC-side protection circuit. The energy storage converter power unit is connected to the AC power supply through the DC side protection circuit and to the load module through the AC side protection circuit.

2. The testing system as described in claim 1, characterized in that, The control circuit includes a control terminal, and each of the energy storage converter power units is connected to a DC side protection circuit. 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, the DC fuse, the voltage sensor, and the insulation detection sensor are connected to the DC power supply cable in the test subsystem and are communicatively connected to the control terminal.

3. The testing system as described in claim 2, characterized in that, 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, AC fuse, current sensor, and temperature sensor are connected to the AC load circuit in the test subsystem and are communicatively connected to the control terminal.

4. The testing system as described in claim 3, characterized in that, Each test subsystem includes a rectifier module, the input of which is connected to an AC power supply, and the output of which is connected to a DC circuit breaker.

5. The testing system as described in claim 4, characterized in that, The circuit under test also includes a load, which includes a high-power reactor; a temperature sensor is installed on the load, and the temperature sensor is communicatively connected to the control terminal.

6. The testing system as described in claim 5, characterized in that, The testing system also includes a load cooling system, which is communicatively connected to the control terminal.

7. The test system as described in any one of claims 1-6, characterized in that, The energy storage converter power unit in each of the test subsystems is cascaded in the circuit under test.

8. The testing system as described in any one of claims 1-6, characterized in that, The circuit under test also includes a human sensor, which is communicatively connected to the control circuit.

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