Energy storage converter test system

Abstract

The utility model provides an energy storage converter test system. The test system comprises a master controller and a power unit controller, wherein the master controller is connected with the power unit controller through an optical fiber with the same length as the actual field; and the main controller sends a control instruction to the power unit controller and receives a communication signal responded by the power unit controller, and simulates a test scene of control and feedback communication between a controller and the multi-stage power unit body in an actual field. According to an exemplary embodiment, the test system can verify execution conditions of functions of all parts of a field actual program, and compared with a mode of constructing a complete platform or directly testing on site, more efficient and quicker verification can be achieved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of energy storage systems, and in particular, to an energy storage converter testing system. BACKGROUND

[0002] The cascaded energy storage technology based on the cascaded H-bridge topology has high safety, high economy and high efficiency in large-scale energy storage power stations, and has obtained high recognition in the market.

[0003] With the continuous development and maturity of technology, the number of high-voltage cascaded energy storage single machines is increasing, and the testing of the overall system program is becoming more and more complex. Once there is a program or communication problem, it may cause certain risks and affect the stability and reliability of system operation. The construction of the whole machine power platform, the complexity and difficulty of system testing, and the verification of the core control program of the system are facing great challenges.

[0004] It should be noted that the statements herein only provide background information related to the present disclosure, and do not necessarily constitute the prior art. CONTENT OF THE UTILITY MODEL

[0005] In view of the above problems, an energy storage converter testing system is 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, an energy storage converter testing system is provided, which includes a master controller and a power unit controller, the master controller and the power unit controller are connected through an optical fiber with the same length as the actual field, the master controller sends control instructions to the power unit controller and receives communication signals in response from the power unit controller, simulating the testing scenario of control and feedback communication between an actual field controller and multiple power unit bodies.

[0008] Preferably, the master controller includes a first power board, a first touch screen, a first main board and a first optical fiber board, the first power board is connected to the first touch screen and the first main board respectively, and the first main board is connected to the first optical fiber board through a first connection terminal.

[0009] Preferably, the power unit controller includes a second power board, a second touch screen, a second main board and a second optical fiber board, the second power board is connected to the second touch screen and the second main board respectively, and the second main board is connected to the second optical fiber board through a second connection terminal.

[0010] Preferably, the first fiber plate comprises N, and the first main plate is provided with N first connection terminals, and the N first connection terminals are connected with the N first fiber plates respectively, wherein N is an integer greater than 1.

[0011] Preferably, the second fiber plate comprises N, and the second main plate is provided with N second connection terminals, and the N second connection terminals are connected with the N second fiber plates respectively, wherein N is an integer greater than 1.

[0012] Preferably, the first connection terminal is connected with the first fiber plate through a wire harness, and the second connection terminal is connected with the second fiber plate through a wire harness.

[0013] Preferably, the first touch screen is connected with the first main plate through an RS-232 interface, and the second touch screen is connected with the second main plate through an RS-232 interface.

[0014] Preferably, the first fiber plate is connected with the second fiber plate through a plurality of pairs of transceiving optical fibers.

[0015] The above at least one technical scheme adopted by the exemplary embodiments can achieve the following beneficial effects:

[0016] In the exemplary embodiments of the present disclosure, the energy storage converter test system uses two sets of controllers and actual optical fibers to run in the laboratory to simulate the operation control situation in the field, and to realize the test of the control program in the field and the stability and reliability of the optical fiber in the long-time operation scene in the field.

[0017] It should be understood that the content part of the utility model is not used to identify the key or basic features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description of some embodiments thereof, taken in conjunction with the accompanying drawings in which:

[0019] Figure 1 The figure is a schematic diagram of the energy storage converter test system in the embodiments of the present disclosure. DETAILED DESCRIPTION

[0020] The principles of the present disclosure will now be described with reference to some embodiments. It should be understood that the description of these embodiments is merely intended to be illustrative and to assist those skilled in the art in understanding and implementing the present disclosure, and does not impose any limitation on the scope of the present disclosure. The disclosure described herein can be implemented in a manner different from that described below.

[0021] In the following description and claims, unless otherwise specified, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0022] Reference throughout this disclosure to "one embodiment", "an embodiment", "exemplary embodiment", or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0023] It should be understood that, although the terms "first" and "second" and the like can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the example embodiments. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed terms.

[0024] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "set of elements" or "collection of elements" is intended to include one or more elements. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", when used herein, specify the presence of stated features, elements and / or components etc. but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0025] As used in this disclosure, the term "circuitry" can refer to one or more or all of the following:

[0026] (a) hardware-only circuit implementations (such as implementations in analog and / or digital circuitry)

[0027] (b) combinations of hardware circuits and software, such as (as applicable):

[0028] (i) combinations of analog and / or digital hardware circuits with software / firmware

[0029] (ii) any portions of hardware processor(s) with software (including digital signal processors); and

[0030] (c) hardware circuitry and / or a processor (e.g., a microprocessor) that requires software (e.g., firmware) for operation, but is not operating software when it is not needed.

[0031] The definition of circuit applies to all uses of this term in this disclosure, including in any claims. As another example, as used in this disclosure, the term circuit also includes implementations of only hardware circuitry or a processor (or multiple processors), or hardware circuitry or a processor (or multiple processors) in combination with software and / or firmware that makes the hardware circuitry (or processor(s)) implement the feature of the circuit or circuitry. 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.

[0032] The low-voltage energy storage technology is to connect multiple small systems in parallel and then step up through a transformer to access the power grid. The programs of multiple small systems are the same, the optical fiber wiring is short, the verification program and the stable communication can directly use a small system for verification, which is convenient and fast. The high-voltage cascade system is to connect battery units in series and control the opening and closing of each power unit inverter through the controller. The voltage output by each unit is superimposed to realize high-voltage output. The applicant has made some research on the high-voltage cascade system: for the actual control effect verification of the program, the following two methods are usually used for verification:

[0033] 1) Test on the whole system. Build the whole required system, including all energy storage units, power unit bodies, and controllers. Connect the power unit body and the controller through the actual use of optical fiber, burn the required detection program, and run for a long time in the actual project to test the stability and reliability of the program and long optical fiber communication under long-time operation.

[0034] 2) Build a small cascade platform, rewrite and adapt the program, build a 3-level 5-level small energy storage system for physical testing, and verify whether the program and hardware cooperate reasonably and correctly within a small cascade range.

[0035] The above two technical solutions have the following technical problems:

[0036] 1) Test using the whole system, especially in the case of large cascade, the installation of the whole system takes a long time, and since it is a high-voltage system, if there is an error in the program, it will lead to loss of control and cause great economic loss and personal danger;

[0037] 2) The actual controller and unit body are used in the small cascade platform, which can better test part of the communication and controller logic, but since the real cascade energy storage cascade is large, the program logic tested by the small cascade test platform is simplified, and the complete control logic and the communication reliability of all optical fibers cannot be verified.

[0038] Based on this, the application proposes a cascade H-bridge energy storage converter test system. In an exemplary embodiment, two sets of controllers in the energy storage converter test system are connected and communicated through field equal-length optical fibers, which is simple and convenient to wire, does not need to access a high-voltage system, has less risk, and can accurately reproduce the communication distortion problem caused by the length of the field equal-length optical fiber.

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

[0040] The disclosed embodiments provide an energy storage converter test system. As shown in Figure 1 A schematic diagram of an energy storage converter test system in the embodiments of the present disclosure is provided. The test system includes a master controller and a power unit controller, the master controller is connected with the power unit controller through an optical fiber with the same length as the actual field; the master controller sends control instructions to the power unit controller and receives communication signals in response from the power unit controller, simulating the test scene of control and feedback communication between an actual field controller and multiple power unit bodies.

[0041] As shown in Figure 1 The same optical fiber as the field connection scene is used to connect two sets of controllers, i.e., the master controller and the power unit controller. The master controller and the field controller burn the same program, and the power unit controller transplants the field power unit program. Each set of controllers is composed of a touch screen, a power board, a main board, and an optical fiber board. The power board supplies power to the touch screen and the main board. The touch screen and the main board communicate through the 232 communication protocol. The main board terminal is connected to the optical fiber board through a wire. Each optical fiber board has k pairs of optical fiber interfaces. The master controller and the power unit controller are connected using the same length of optical fiber as the actual field use scenario. One pair of optical fibers corresponds to the simulation of one power unit, so the same number of cascaded power units as the field can be simulated.

[0042] It can be understood that the disclosed embodiments simulate the control and feedback communication between the field controller and the multiple power unit bodies through the master controller and the power unit controller, and verify the stability of the control program and the long optical fiber long-time communication.

[0043] In some embodiments, the master controller includes a first power board, a first touch screen, a first main board, and a first optical fiber board. The first power board is connected to the first touch screen and the first main board, respectively. The first main board is connected to the first optical fiber board through a first connection terminal. The first optical fiber board includes N, and the first main board is provided with N first connection terminals. N first connection terminals are respectively connected to N first optical fiber boards, wherein N is an integer greater than 1.

[0044] AsFigure 1 As shown, the main controller power board is connected to both the main controller touchscreen and the main controller motherboard via cables, providing power to both. The main controller motherboard has N motherboard terminals, where N is an integer greater than 1. Each main controller motherboard terminal is connected to a main controller fiber optic board via a ribbon cable.

[0045] In some embodiments, the power unit controller includes a second power board, a second touchscreen, a second motherboard, and a second fiber optic board. The second power board is connected to both the second touchscreen and the second motherboard. The second motherboard is connected to the second fiber optic board via second connection terminals. There are N second fiber optic boards, and the second motherboard has N second connection terminals, each connected to one of the N second fiber optic boards, where N is an integer greater than 1. The first connection terminals are connected to the first fiber optic boards via ribbon cables, and the second connection terminals are connected to the second fiber optic boards via ribbon cables. The first fiber optic board and the second fiber optic board are connected via multiple pairs of transceiver optical fibers.

[0046] Continue to refer to Figure 1 The power unit controller power board is connected to both the power unit controller touchscreen and the power unit controller mainboard via cables, providing power to both. The power unit controller mainboard has N mainboard terminals, where N is an integer greater than 1. Each power unit controller mainboard terminal is connected to a power unit controller fiber optic board via a ribbon cable. The main controller fiber optic board and the corresponding power unit controller fiber optic board are connected via transceiver fiber optic cables. It should be noted that the transceiver fiber optic cables are identical in type and length to those used in actual scenarios, simulating real-world fiber optic communication.

[0047] In some embodiments, the first touchscreen is connected to the first motherboard via an RS-232 interface, and the second touchscreen is connected to the second motherboard via an RS-232 interface.

[0048] To more clearly illustrate the testing scheme of the energy storage converter testing system in this application, please refer to the following steps:

[0049] 1) Press Figure 1 As shown, the two controllers are connected using optical fibers of the actual length used on site. The main controller is programmed with the actual controller program on site, and the power unit controller is programmed with the ported power unit program on site, with the DC voltage of each power unit preset in the program.

[0050] 2) On the main controller's touch screen, issue standby command, the main controller issues the command to the power unit controller through the optical fiber, observes whether the corresponding instruction is received on the power unit controller touch screen and makes correct feedback, observes whether the feedback signal is received on the main controller touch screen and whether the DC voltage is equal to the preset value, if there is no error, it means that the main controller program contactor control, sending, receiving part is normal.

[0051] 3) After normal standby, start running on the main control touch screen, issue open-loop voltage control instruction, at this time the main controller transmits PWM modulation signal to the power unit controller through the optical fiber, the power unit body superimposes the received switching signal of each stage to get the total output wave, which is equivalent to the modulation wave issued by the main controller, by verifying whether the waveform is consistent with the issued open-loop voltage instruction, it can be verified whether the main controller control part program is abnormal.

[0052] 4) Issue fixed state feedback signal on the power unit controller touch screen, i.e. simulate actual power unit body failure, set fault level and fault type, the power unit controller touch screen communicates with the mainboard through 232 communication line, the mainboard sends the signal back to the main control mainboard through the optical fiber, observes whether the state feedback is correct on the main controller touch screen and whether the main controller action meets the expectation. If A phase 20th stage over-temperature fault is set on the power unit touch screen, the main controller will be converted from running state to fault stop, and A20 over-temperature fault can be observed on the state display interface. If the simulation fault display is correct, it means that the main controller program receiving information processing part has no error and meets the expectation.

[0053] 5) Through the above 4 steps, it can be proved that the controller program can correctly execute the function, the optical fiber communication short-time operation is correct, the obvious error frame is cancelled and reset, the standby running instruction is issued on the main controller touch screen, the open-loop voltage instruction is given, the running is stable, and the long-time running is maintained, such as 8 hours running. If there is no fault for 8 hours and it runs stably, it is considered that the field can also run normally and stably with these length optical fibers; if a fault occurs during the test time and the running is converted to fault stop, the fault recording interface of the main controller touch screen is observed to get the fault position, type and time, analyze whether it is due to optical fiber problem or program long-time running error, improve the structure or program and test again until the test standard is met.

[0054] It should be understood that the application adopts two sets of controllers to simulate the on-site operation, one set simulates the control commands issued by the on-site controller and the feedback received, and the other set simulates the execution of the issued commands by the on-site multi-stage power unit and the feedback, which is simple and convenient to connect, and does not access the high-voltage system, and the risk is relatively small. The two sets of controllers are connected by an equal-length optical fiber as in the field, which can accurately reproduce the communication distortion problem caused by the length of the equal-length optical fiber. By simulating the operation of the whole system on site, the execution functions of each part of the main control program can be tested in the laboratory, saving the time and risk of high-voltage operation for detecting the whole system, and using the power unit controller to simulate the on-site multi-stage power unit, realizing one-to-one multi-stage control consistent with the field, and comprehensively testing the control, sending, receiving, and processing of the main control program. The program verification is fast and safe.

[0055] It should be noted that in the description of the present application, the terms "first", "second" and the like are used only for the purpose of description and should not be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more.

[0056] In the present application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the present application, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0058] Any procedural or methodological descriptions in flow charts or otherwise described herein can be understood to represent modules, segments, or portions of code that include executable instructions for implementing the logic functions or procedures described, and the scope of preferred embodiments of the present application includes additional implementations in which the functions can be performed in an order different from that shown or discussed, including substantially simultaneously, or in reverse order, as will be understood by those having ordinary skill in the art to which embodiments of the present application pertain.

[0059] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0060] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present application.

Claims

1. An energy storage inverter test system, characterized by, The test system comprises a main controller and a power unit controller, the main controller is connected with the power unit controller through optical fibers with the same length as that in actual field; The main controller sends control instructions to the power unit controller and receives communication signals in response to the power unit controller, thereby simulating a test scene of control and feedback communication between a controller and multiple power unit bodies in actual field.

2. The test system of claim 1, wherein, The main controller comprises a first power board, a first touch screen, a first main board and a first optical fiber board, the first power board is connected with the first touch screen and the first main board respectively, and the first main board is connected with the first optical fiber board through a first connecting terminal.

3. The test system of claim 2, wherein, The power unit controller comprises a second power board, a second touch screen, a second main board and a second optical fiber board, the second power board is connected with the second touch screen and the second main board respectively, and the second main board is connected with the second optical fiber board through a second connecting terminal.

4. The test system of claim 3, wherein, The first optical fiber board comprises N, the first main board is provided with N first connecting terminals, and N first connecting terminals are connected with N first optical fiber boards respectively, wherein N is an integer greater than 1.

5. The test system of claim 3, wherein, The second optical fiber board comprises N, the second main board is provided with N second connecting terminals, and N second connecting terminals are connected with N second optical fiber boards respectively, wherein N is an integer greater than 1.

6. The test system of any of claims 4, 5, wherein, The first connecting terminal is connected with the first optical fiber board through a wire harness, and the second connecting terminal is connected with the second optical fiber board through a wire harness.

7. The test system of any of claims 4, 5, wherein, The first touch screen is connected with the first main board through an RS-232 interface, and the second touch screen is connected with the second main board through an RS-232 interface.

8. The test system of any of claims 4, 5, wherein, The first optical fiber board is connected with the second optical fiber board through multiple pairs of transceiving optical fibers.

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