Method and device for setting test power of energy storage converter

Abstract

The invention discloses an energy storage converter test power setting method and device, and relates to the field of converter testing, the energy storage converter test power setting method is applied to an energy storage converter test system, and the energy storage converter test system comprises a high-voltage power grid, a power isolation transformer, a first energy storage converter and a second energy storage converter; wherein the high-voltage power grid is electrically connected with one end of the power isolation transformer, and the first energy storage converter and the second energy storage converter are electrically connected with the other end of the power isolation transformer. Sending a first optical fiber signal to a second energy storage converter based on the target optical fiber transmission channel; and indicating the second energy storage converter to set the power of the second energy storage converter based on the received optical fiber signal, so that the sum of the set second power of the second energy storage converter and the power indicated in the received optical fiber signal is zero.

Description

Technical Field

[0001] The present application relates to the field of converter testing, and in particular, to a method and device for setting test power of an energy storage converter. Background Art

[0002] High-voltage cascade energy storage system has gradually become the preferred topology for large-capacity energy storage system due to its advantages such as large single-unit power, low harmonic content, and high charge-discharge conversion efficiency. High-voltage cascade energy storage system adopts cascade topology and control algorithm, and each phase is composed of several H-bridge energy storage converter units in series phase shifting and superposition, which can achieve direct connection with 35kV power grid without step-up transformer. Compared with traditional low-voltage solutions, the single-unit power of high-voltage cascade energy storage system is greatly improved, and the rated output power range of single unit is 10MW~30MW. It is especially suitable for high-voltage and large-capacity energy storage applications such as grid-side energy storage peak-shaving and frequency regulation power stations, thermal power units combined with automatic power plant control system (Automatic Generation Control, referred to as AGC) frequency regulation, and new energy power stations to increase penetration rate.

[0003] Energy storage system products produced by manufacturers must be issued a type test report by a third party before they can obtain grid connection permission. Therefore, high-voltage cascade energy storage systems will complete relevant type tests before leaving the factory. According to the national standard energy storage inverter technical requirements, the inverter often needs to operate in full-power charging / discharging state, and even when testing the charge and discharge conversion time, it is an extreme condition of switching from full-power charging to full-power discharging. However, the transformer load in the factory of general energy storage inverter manufacturers does not exceed 1MW, which brings certain difficulties to the type test. It is easy to cause overload tripping when high-power load or high-power load switching, affecting the progress of the test and causing safety hazards.

[0004] In the related art, there are generally two schemes for implementing a small power transformer with a high power energy storage converter (Power Conversion System, referred to as PCS) for energy storage converter testing. One of the schemes is that since the power of a single energy storage converter is greater than the rated power of the front-end transformer, it is impossible to conduct full power operation related experiments. Therefore, two energy storage converters with the same power are connected to the same section of the AC bus at the rear end of the transformer to achieve two-way energy storage converter dragging. The two energy storage converters are manually set to charge and discharge power in a step-by-step manner to gradually increase the power to full power operation. However, this scheme requires two energy storage converters to be operated separately and communicate with each other to synchronously set power, which has many problems such as labor consumption, long time, and complicated procedures. In addition, when conducting tests, full power and millisecond-level switching are performed, and the auxiliary end cannot set the power in time, which has great limitations.

[0005] Another solution is to connect the current sampling signal of the current transformer (CT) of the main test device to the second auxiliary energy storage inverter. The second energy storage inverter automatically sets the opposite power according to the CT sampling current to achieve the power compensation function. At this time, the load current of the front-end transformer is very small, and it can achieve full power operation. However, this solution will have a certain delay due to its reliance on CT sampling data. Moreover, when the main test device performs high-power instantaneous switching, if the auxiliary energy storage inverter follows slowly, the main transformer will be at risk of overcurrent tripping.

[0006] Regarding the problem in related technologies that it is difficult for two energy storage inverters to achieve real-time power coordination during energy storage inverter testing, no effective solution has been proposed so far.

[0007] Therefore, it is necessary to improve the related technology to overcome the above-mentioned defects in the related technology. Summary of the invention

[0008] The embodiment of the present invention provides a method and device for setting the test power of an energy storage converter, so as to at least solve the problem that it is difficult to achieve real-time power coordination between two energy storage converters during the energy storage converter test.

[0009] According to one aspect of an embodiment of the present invention, a method for setting test power of an energy storage inverter is provided, which is applied to an energy storage inverter test system, wherein the energy storage inverter test system comprises: a high-voltage power grid, a power isolation transformer, a first energy storage inverter and a second energy storage inverter; wherein the high-voltage power grid is electrically connected to one end of the power isolation transformer, and the first energy storage inverter and the second energy storage inverter are electrically connected to the other end of the power isolation transformer respectively, comprising: when the first energy storage inverter receives a setting instruction, sending a first optical fiber signal to the second energy storage inverter based on a target optical fiber transmission channel through the first energy storage inverter, wherein the setting instruction is used to set the power of the first energy storage inverter to a first power, the first optical fiber signal is used to indicate that the power of the first energy storage inverter is the first power, and the target optical fiber transmission channel is the optical fiber transmission channel between the first energy storage inverter and the second energy storage inverter; and instructing the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, so that the sum of the second power of the second energy storage inverter after setting and the power indicated in the received optical fiber signal is zero.

[0010] In an exemplary embodiment, sending a first fiber optic signal to the first energy storage inverter based on a target fiber optic transmission channel through the first energy storage inverter includes: sending the first fiber optic signal to the second fiber optic adapter board of the second energy storage inverter based on the target fiber optic transmission channel through the first fiber optic adapter board of the first energy storage inverter, wherein the target fiber optic transmission channel is the fiber optic transmission channel between the first fiber optic adapter board and the second fiber optic adapter board.

[0011] In an exemplary embodiment, after instructing the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, the method also includes: receiving a second optical fiber signal sent by the second energy storage inverter through the first energy storage inverter, wherein the second optical fiber signal is used to indicate that the power of the second energy storage inverter is a second power; determining the sum of the first power and the second power through the first energy storage inverter to obtain a target value; when it is determined that the target value is greater than a preset threshold, disconnecting the first AC contactor through the first energy storage inverter, and simultaneously sending a tripping instruction to the second energy storage inverter to instruct the second energy storage inverter to disconnect the second AC contactor, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0012] In an exemplary embodiment, the method further includes: when it is detected that the first AC contactor is in a disconnected state, sending a tripping instruction to the second energy storage inverter through the first energy storage inverter to instruct the second energy storage inverter to disconnect the second AC contactor, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0013] In an exemplary embodiment, the method also includes: upon obtaining a tripping instruction sent by the second energy storage inverter, disconnecting the first AC contactor through the first energy storage inverter, wherein the tripping instruction is an instruction sent by the second energy storage inverter when it detects that the second AC contactor is in a disconnected state, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0014] In an exemplary embodiment, the tripping instruction is transmitted through the target optical fiber transmission channel between the first energy storage converter and the second energy storage converter.

[0015] According to another aspect of an embodiment of the present invention, there is also provided a device for setting the test power of an energy storage converter, which is applied to an energy storage converter test system. The energy storage converter test system comprises: a high-voltage power grid, a power isolation transformer, a first energy storage converter and a second energy storage converter; wherein the high-voltage power grid is electrically connected to one end of the power isolation transformer, and the first energy storage converter and the second energy storage converter are electrically connected to the other end of the power isolation transformer, respectively, and comprises: a sending module for, when the first energy storage converter receives a setting instruction, transmitting a setting instruction based on a target optical fiber transmission channel through the first energy storage converter A first optical fiber signal is sent to the second energy storage inverter, wherein the setting instruction is used to set the power of the first energy storage inverter to a first power, the first optical fiber signal is used to indicate that the power of the first energy storage inverter is the first power, and the target optical fiber transmission channel is the optical fiber transmission channel between the first energy storage inverter and the second energy storage inverter; an indication module is used to instruct the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal so that the sum of the second power of the second energy storage inverter after setting and the power indicated in the received optical fiber signal is zero.

[0016] According to another aspect of the embodiments of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the power setting method when running.

[0017] According to another aspect of an embodiment of the present invention, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the power setting method through the computer program.

[0018] According to another aspect of the embodiments of the present invention, a computer program product is provided, including a computer program, and the power setting method is implemented when the computer program is executed by a processor.

[0019] Through the present invention, when the first energy storage inverter receives the setting instruction, it sends the first optical fiber signal to the second energy storage inverter based on the optical fiber transmission channel, thereby instructing the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, so as to achieve that the sum of the power of the second energy storage inverter after setting and the power indicated in the optical fiber signal is zero. Since the power coordination of the two energy storage inverters is based on the optical fiber transmission channel, the real-time power coordination of the two energy storage inverters can be achieved, thereby solving the problem that the two energy storage inverters are difficult to achieve real-time power coordination in the energy storage inverter test. In addition, since the two energy storage inverters achieve power compensation, no matter how much the output power of the small power transformer is, it can drive the large power energy storage inverter to complete the energy storage inverter test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 It is a hardware structure block diagram of a mobile terminal of a method for setting power of an energy storage converter test according to an embodiment of the present invention;

[0023] Figure 2 is a flow chart of a method for setting test power of an energy storage converter according to an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of a main circuit of a type test of a high-voltage cascade energy storage system according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of optical fiber communication data switching according to an embodiment of the present invention;

[0026] Figure 5 is a flow chart of a fiber optic communication type drag experiment in a factory according to an embodiment of the present invention;

[0027] Figure 6 The present invention is a structural block diagram of a device for setting test power of an energy storage converter according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 1 is a hardware structure block diagram of a mobile terminal for setting the test power of an energy storage converter according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor (Central Processing Unit, CPU) or a programmable logic device (Field Programmable Gate Array, FPGA)) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0031] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the power setting method in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0032] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0033] In this embodiment, a method for setting the test power of an energy storage converter is provided, which is applied to an energy storage converter test system. The energy storage converter test system includes: a high-voltage power grid, a power isolation transformer, a first energy storage converter and a second energy storage converter; wherein the high-voltage power grid is electrically connected to one end of the power isolation transformer, and the first energy storage converter and the second energy storage converter are electrically connected to the other end of the power isolation transformer, respectively. Figure 2 is a flow chart of a method for setting test power of an energy storage converter according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps S202-S204:

[0034] Step S202: when the first energy storage inverter receives a setting instruction, a first optical fiber signal is sent to the second energy storage inverter through the first energy storage inverter based on a target optical fiber transmission channel, wherein the setting instruction is used to set the power of the first energy storage inverter to a first power, the first optical fiber signal is used to indicate that the power of the first energy storage inverter is the first power, and the target optical fiber transmission channel is the optical fiber transmission channel between the first energy storage inverter and the second energy storage inverter;

[0035] Optionally, refer to Figure 3The energy storage converter test system further includes: a primary main AC circuit breaker ( Figure 3 QF in), the first AC contactor ( Figure 3 K1 in), the first energy storage converter main controller, the first optical fiber adapter board, the second AC contactor ( Figure 3 K2 in the figure), the second energy storage converter main controller, and the second optical fiber adapter board. Among them, QF will be disconnected in time when the system fails to protect the power isolation transformer from line overload. K1 and K2 are grid-connected AC contactors.

[0036] It should be noted that the voltage level of the high-voltage power grid is generally 6 kV / 10 kV, that is, in this high-voltage power grid, the output voltage can vary between 6 kV and 10 kV; the power isolation transformer will be configured according to the voltage level of the energy storage inverter to be tested, and the maximum power (i.e. capacity) that can be transmitted is generally 500 to 1000 kVA.

[0037] Optionally, the output power of the power isolation transformer is less than a preset limit value, and the rated powers of the first energy storage inverter and the second energy storage inverter are both greater than the preset limit value. Therefore, in order to realize the small-power transformer driving the large-power energy storage inverter (i.e., the first energy storage inverter) for type testing, it is necessary to balance the power of the first energy storage inverter through the second energy storage inverter, so that the sum of the powers of the first energy storage inverter and the second energy storage inverter is as small as possible (generally 0) to prevent overcurrent in the power isolation transformer.

[0038] It should be noted that the first energy storage converter main controller is mounted on the first energy storage converter, and the second energy storage converter main controller is mounted on the second energy storage converter.

[0039] Step S204: instruct the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, so that the sum of the set second power of the second energy storage inverter and the power indicated in the received optical fiber signal is zero.

[0040] Optionally, the first energy storage inverter receives a setting instruction sent by the host computer, and the first optical fiber signal sent by the first energy storage inverter is transmitted to the second energy storage inverter through the target optical fiber transmission channel. The second energy storage inverter will receive the optical fiber signal, and the power indicated by the optical fiber signal is equal to the power indicated by the first optical fiber signal.

[0041] Optionally, refer to Figure 3 The second energy storage inverter will invert the power indicated by the received optical fiber signal, thereby setting the power of the second energy storage inverter and obtaining the second power of the second energy storage inverter, so that the sum of the second power and the power indicated in the optical fiber signal is zero.

[0042] In the above steps, when the first energy storage inverter receives the setting instruction, it sends the first optical fiber signal to the second energy storage inverter based on the optical fiber transmission channel, thereby instructing the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, so as to achieve that the sum of the power of the second energy storage inverter after setting and the power indicated in the optical fiber signal is zero. Since the power coordination of the two energy storage inverters is based on the optical fiber transmission channel, the real-time power coordination of the two energy storage inverters can be achieved, thereby solving the problem that the two energy storage inverters are difficult to achieve real-time power coordination in the energy storage inverter test. In addition, since the two energy storage inverters realize power compensation, no matter how much the output power of the small power transformer is, it can drive the large power energy storage inverter to complete the energy storage inverter test.

[0043] In an exemplary embodiment, sending a first fiber optic signal to the first energy storage inverter based on a target fiber optic transmission channel through the first energy storage inverter can be achieved by the following steps: sending the first fiber optic signal to the second fiber optic adapter board of the second energy storage inverter based on the target fiber optic transmission channel through the first fiber optic adapter board of the first energy storage inverter, wherein the target fiber optic transmission channel is the fiber optic transmission channel between the first fiber optic adapter board and the second fiber optic adapter board.

[0044] Optionally, refer to Figure 3 A set of optical fiber adapter boards are respectively mounted on the first energy storage inverter main controller and the second energy storage inverter main controller. The optical fiber adapter boards are used to convert the electrical signals output by the energy storage inverter into optical signals, and convert the optical signals received by the energy storage inverter into electrical signals.

[0045] Optionally, the fiber optic adapter board has at least one pair of fiber optic input and output, and the main controller defines the fiber optic communication protocol of the fiber optic transmission channel to ensure that the energy storage inverter can accurately send and receive corresponding instructions and data information.

[0046] Optionally, when the first energy storage inverter receives a setting instruction, the first energy storage inverter will output a first electrical signal, and the first optical fiber adapter board on the first energy storage inverter main controller will convert the electrical signal output by the first energy storage inverter main controller into a first optical fiber signal, and transmit the first optical fiber signal to the second optical fiber adapter board on the second energy storage inverter main controller through the optical fiber sending port on the first optical fiber adapter board, and the second optical fiber adapter board converts the received optical fiber signal into an electrical signal to provide it to the second energy storage inverter main controller for analysis, and the second energy storage inverter main controller thereby inverts the power indicated by the received optical fiber signal, thereby ensuring that the sum of the powers of the first energy storage inverter and the second energy storage inverter is approximately 0, and there is no power deviation caused by delay.

[0047] In an exemplary embodiment, after instructing the second energy storage converter to set the power of the second energy storage converter based on the received optical fiber signal, the method further includes the following steps S11-S13:

[0048] Step S11: receiving, through the first energy storage converter, a second optical fiber signal sent by the second energy storage converter, wherein the second optical fiber signal is used to indicate that the power of the second energy storage converter is a second power;

[0049] Optionally, the second energy storage inverter is equipped with a second energy storage inverter main controller. After the second energy storage inverter is set to power, the second energy storage inverter main controller immediately sends a second optical fiber signal to the first energy storage inverter through the optical fiber sending port on the second optical fiber adapter board to inform the first energy storage inverter of the set second power of the second energy storage inverter.

[0050] Step S12: determining the sum of the first power and the second power by the first energy storage converter to obtain a target value;

[0051] Optionally, the first energy storage converter filters the received second optical fiber signal to obtain a second power value, and sums the first power and the second power to compare power deviations to obtain a target value.

[0052] Step S13: When it is determined that the target value is greater than a preset threshold value, the first AC contactor is disconnected through the first energy storage inverter, and a tripping instruction is simultaneously sent to the second energy storage inverter to instruct the second energy storage inverter to disconnect the second AC contactor, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0053] It should be noted that, since the optical fiber signal is transmitted through the optical fiber transmission channel, light attenuation and the like may occur during the transmission process, resulting in a weakening of the signal strength. That is to say, there may be a certain difference between the first power indicated by the first optical fiber signal and the power indicated by the optical fiber signal. The party receiving the optical fiber signal (i.e., the second energy storage inverter) needs to provide feedback to the party sending the optical fiber signal (i.e., the first energy storage inverter) and make timely adjustments to improve the accuracy of the power setting of the second energy storage inverter.

[0054] It should be noted that if the target value is greater than the preset threshold, it means that the second power set by the second energy storage inverter deviates too much from the first power of the first energy storage inverter, which may cause dangers such as circuit overload and power isolation transformer failure. The first AC contactor will immediately disconnect the first AC contactor and instruct the second energy storage inverter to disconnect the second AC contactor to ensure the safety of the system and testers.

[0055] In an exemplary embodiment, the method further includes the following steps: when it is detected that the first AC contactor is in a disconnected state, sending a tripping instruction to the second energy storage inverter through the first energy storage inverter to instruct the second energy storage inverter to disconnect the second AC contactor, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0056] That is to say, for example, when the circuit load current suddenly increases due to an incorrect operation, the first AC contactor will be disconnected immediately. When the first AC contactor is disconnected, the first energy storage inverter will immediately instruct the second energy storage inverter to disconnect the second AC contactor, thereby avoiding risks in time and ensuring the safety of the system and testers.

[0057] In an exemplary embodiment, the method also includes the following steps: upon obtaining a tripping instruction sent by the second energy storage inverter, disconnecting the first AC contactor through the first energy storage inverter, wherein the tripping instruction is an instruction sent by the second energy storage inverter when it detects that the second AC contactor is in a disconnected state, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0058] That is to say, when the second AC contactor is disconnected, the second energy storage converter will also immediately instruct the first energy storage converter to disconnect the first AC contactor to ensure circuit safety.

[0059] It should be noted that, through the above steps, when any of the two energy storage converters trips and stops due to a fault and / or the AC contactor normally shuts down and disconnects, the other energy storage converter will also receive a disconnection instruction to achieve synchronous disconnection. The shared disconnection instruction can prevent the other energy storage converter from maintaining high power when a single energy storage converter fails, causing overcurrent in the power isolation transformer, and can also prevent overcurrent caused by human error shutdown.

[0060] In an exemplary embodiment, the tripping instruction is transmitted through the target optical fiber transmission channel between the first energy storage converter and the second energy storage converter.

[0061] It should be noted that, through the above steps, an optical fiber transmission channel (including but not limited to two communication optical fibers) is used to transmit optical fiber signals and / or instructions, thereby realizing the reception and transmission of instructions and / or data. At the same time, in conjunction with the data communication protocol in the software, the speed of data transmission is improved, so that the two energy storage inverters can achieve real-time power coordination and ensure that the power of the power isolation transformer does not exceed the limit.

[0062] Obviously, the above-described embodiments are only embodiments of a part of the present invention, rather than all embodiments. In order to better understand the above method, the above process is described below in conjunction with embodiments, but it is not intended to limit the technical solutions of the embodiments of the present invention, specifically:

[0063] This embodiment provides a method for setting the test power of an energy storage converter, which is applied to an energy storage converter test system, wherein the energy storage converter test system includes: a high-voltage power grid, a power isolation transformer, a first energy storage converter, and a second energy storage converter; wherein the high-voltage power grid is electrically connected to one end of the power isolation transformer, and the first energy storage converter and the second energy storage converter are electrically connected to the other end of the power isolation transformer, respectively, as follows:

[0064] one, Figure 3 An optional main wiring method for high-power type test of high-voltage cascade energy storage system is shown;

[0065] The high-voltage cascade energy storage system realizes power control and system protection based on the sampled grid voltage and current information and the power instructions issued by the controller.

[0066] It should be noted that the high-voltage cascade energy storage system is mainly composed of a high-voltage power grid, a small-power isolation transformer, a primary main AC circuit breaker QF, a main test device of the high-voltage cascade energy storage system, the energy storage converter 1, the main controller of the energy storage converter 1, the energy storage converter contactor K1, the auxiliary test equipment, the energy storage converter 2, the main controller of the energy storage converter 2, and the energy storage converter contactor K2. The high-voltage power grid is generally 6 / 10kV, and the small-power isolation transformer is configured according to the voltage level of the energy storage converter to be tested. The capacity is generally 500-1000kVA. QF is disconnected in time when the system fails to protect the transformer from overcurrent. K1 and K2 are grid-connected AC contactors, which are controlled by their respective energy storage converter controllers.

[0067] two, Figure 4 It shows the data transfer mode of optical fiber communication;

[0068] By adding two communication optical fibers to the hardware, the sending and receiving of instructions / data can be realized, and at the same time, the data communication protocol of the software can be used to achieve high-speed data transmission. The two energy storage inverters can achieve real-time power coordination to ensure that the power of the isolation transformer does not exceed the limit.

[0069] three, Figure 5 The process of a fiber optic communication type towing experiment in a factory is illustrated;

[0070] 1. Add a set of fiber optic adapter boards to each main controller of the energy storage inverter to convert the electrical signal output by the energy storage inverter into an optical signal. The fiber optic adapter board has at least one pair of optical fiber input and output. The main controller defines the optical fiber communication protocol and can accurately send and receive corresponding instructions and data information.

[0071] 2. When the main test device energy storage inverter 1 sets power through the host computer (that is, the above-mentioned energy storage inverter receives the setting instruction), the controller of energy storage inverter 1 immediately transmits the received power instruction (including the above-mentioned first optical fiber signal) to the controller of energy storage inverter 2 through the optical fiber sending port. The controller of energy storage inverter 2 inverts the power signal of the optical fiber receiving port to obtain the power instruction of energy storage inverter 2, thereby ensuring that the sum of the powers of energy storage inverter 1 and energy storage inverter 2 is always 0, and there will be no power deviation caused by delay.

[0072] 3. In order to realize the reliable execution of the optical fiber communication power instruction, the present invention also adds a verification mechanism in the optical fiber communication. When the energy storage converter 2 receives the power instruction sent by the energy storage converter 1, it will send the power instruction executed by the energy storage converter 2 to the energy storage converter 1 through the optical fiber transmission port of the energy storage converter 2. The energy storage converter filters the received power instruction and compares the deviation with the power instruction executed by itself. If the power threshold is exceeded, the verification fails and the fault shutdown and tripping are performed;

[0073] The above two power mechanisms fully ensure that there will not be a large deviation in the power of the two energy storage inverters, so that the two energy storage inverters can run at full power. Even the more stringent charge and discharge power conversion time test can be handled with ease, and there will be almost no overload problem for the small power transformer.

[0074] 4. The optical fiber communication information of the present invention also includes a shared trip control instruction. When one of the energy storage converters trips and stops due to a fault, or the contactor trips due to a normal shutdown, the other energy storage converter will also receive a trip instruction at the same time to achieve synchronous tripping. The shared trip instruction can avoid transformer overcurrent caused by the other energy storage converter still maintaining high power when a single energy storage converter fails, and achieve instant interlocking of the two energy storage converters when they trip, avoiding the risk of overcurrent in the front-end transformer, and can also avoid overcurrent problems caused by human error shutdown, thereby improving the safety of type testing.

[0075] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention.

[0076] In this embodiment, a device for setting the test power of an energy storage converter is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0077] Figure 6 It is a structural block diagram of a test power setting device for an energy storage converter according to an embodiment of the present invention, and the device is applied to an energy storage converter test system, and the energy storage converter test system comprises: a high-voltage power grid, a power isolation transformer, a first energy storage converter and a second energy storage converter; wherein the high-voltage power grid is electrically connected to one end of the power isolation transformer, and the first energy storage converter and the second energy storage converter are electrically connected to the other end of the power isolation transformer respectively, and comprise:

[0078] A sending module 602 is used to send a first optical fiber signal to the second energy storage converter based on a target optical fiber transmission channel through the first energy storage converter when the first energy storage converter receives a setting instruction, wherein the setting instruction is used to set the power of the first energy storage converter to a first power, the first optical fiber signal is used to indicate that the power of the first energy storage converter is the first power, and the target optical fiber transmission channel is the optical fiber transmission channel between the first energy storage converter and the second energy storage converter;

[0079] The indication module 604 is used to instruct the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal so that the sum of the set second power of the second energy storage inverter and the power indicated in the received optical fiber signal is zero.

[0080] In the above device, when the first energy storage converter receives the setting instruction, it sends the first optical fiber signal to the second energy storage converter based on the optical fiber transmission channel, thereby instructing the second energy storage converter to set the power of the second energy storage converter based on the received optical fiber signal, so as to achieve that the sum of the power of the second energy storage converter after setting and the power indicated in the optical fiber signal is zero. Since the sum of the power of the second energy storage converter after setting and the power indicated in the optical fiber signal is zero, power compensation between the first energy storage converter and the second energy storage converter is achieved, thereby solving the problem that it is difficult for the two energy storage converters to achieve real-time power coordination in the energy storage converter test. In addition, since the two energy storage converters achieve power compensation, no matter how much the output power of the small power transformer is, it can drive the large power energy storage converter to complete the energy storage converter test.

[0081] In an exemplary embodiment, the sending module 602 is also used to send the first optical fiber signal to the second optical fiber adapter board of the second energy storage inverter through the first optical fiber adapter board of the first energy storage inverter based on the target optical fiber transmission channel, wherein the target optical fiber transmission channel is the optical fiber transmission channel between the first optical fiber adapter board and the second optical fiber adapter board.

[0082] In an exemplary embodiment, the above-mentioned device also includes: a processing module, which is used to receive a second optical fiber signal sent by the second energy storage inverter through the first energy storage inverter after instructing the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, wherein the second optical fiber signal is used to indicate that the power of the second energy storage inverter is the second power; determine the sum of the first power and the second power through the first energy storage inverter to obtain a target value; when it is determined that the target value is greater than a preset threshold, disconnect the first AC contactor through the first energy storage inverter, and simultaneously send a tripping instruction to the second energy storage inverter to instruct the second energy storage inverter to disconnect the second AC contactor, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0083] In an exemplary embodiment, the sending module 602 is also used to send a tripping instruction to the second energy storage inverter through the first energy storage inverter to instruct the second energy storage inverter to disconnect the second AC contactor when it is detected that the first AC contactor is in a disconnected state, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0084] In an exemplary embodiment, the processing module is also used to disconnect the first AC contactor through the first energy storage inverter when a disconnection instruction sent by the second energy storage inverter is obtained, wherein the disconnection instruction is an instruction sent by the second energy storage inverter when it detects that the second AC contactor is in a disconnected state, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

[0085] In an exemplary embodiment, the tripping instruction is transmitted through the target optical fiber transmission channel between the first energy storage converter and the second energy storage converter.

[0086] An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0087] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps:

[0088] S1, when the first energy storage converter receives a setting instruction, sending a first optical fiber signal to the second energy storage converter based on a target optical fiber transmission channel through the first energy storage converter, wherein the setting instruction is used to set the power of the first energy storage converter to a first power, the first optical fiber signal is used to indicate that the power of the first energy storage converter is the first power, and the target optical fiber transmission channel is the optical fiber transmission channel between the first energy storage converter and the second energy storage converter;

[0089] S2, instructing the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, so that the sum of the second power of the second energy storage inverter after setting and the power indicated in the received optical fiber signal is zero.

[0090] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0091] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0092] An embodiment of the present invention further provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps in any one of the above method embodiments are performed.

[0093] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0094] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0095] S1, when the first energy storage converter receives a setting instruction, sending a first optical fiber signal to the second energy storage converter based on a target optical fiber transmission channel through the first energy storage converter, wherein the setting instruction is used to set the power of the first energy storage converter to a first power, the first optical fiber signal is used to indicate that the power of the first energy storage converter is the first power, and the target optical fiber transmission channel is the optical fiber transmission channel between the first energy storage converter and the second energy storage converter;

[0096] S2, instructing the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, so that the sum of the second power of the second energy storage inverter after setting and the power indicated in the received optical fiber signal is zero.

[0097] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0098] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0099] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0100] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for setting the test power of an energy storage converter, characterized in that: Applied to an energy storage converter test system, the energy storage converter test system comprises: a high-voltage power grid, a power isolation transformer, a first energy storage converter and a second energy storage converter; wherein the high-voltage power grid is electrically connected to one end of the power isolation transformer, and the first energy storage converter and the second energy storage converter are electrically connected to the other end of the power isolation transformer respectively, comprising: In the case where the first energy storage converter receives a setting instruction, a first optical fiber signal is sent to the second energy storage converter through the first energy storage converter based on a target optical fiber transmission channel, wherein the setting instruction is used to set the power of the first energy storage converter to a first power, the first optical fiber signal is used to indicate that the power of the first energy storage converter is the first power, and the target optical fiber transmission channel is the optical fiber transmission channel between the first energy storage converter and the second energy storage converter; The second energy storage converter is instructed to set the power of the second energy storage converter based on the received optical fiber signal, so that the sum of the set second power of the second energy storage converter and the power indicated in the received optical fiber signal is zero.

2. The method according to claim 1, characterized in that: Sending a first optical fiber signal to the first energy storage converter based on a target optical fiber transmission channel through the first energy storage converter includes: The first optical fiber signal is sent to the second optical fiber adapter board of the second energy storage inverter through the first optical fiber adapter board of the first energy storage inverter based on a target optical fiber transmission channel, wherein the target optical fiber transmission channel is the optical fiber transmission channel between the first optical fiber adapter board and the second optical fiber adapter board.

3. The method according to claim 1, characterized in that After instructing the second energy storage converter to set the power of the second energy storage converter based on the received optical fiber signal, the method further includes: Receiving, by the first energy storage converter, a second optical fiber signal sent by the second energy storage converter, wherein the second optical fiber signal is used to indicate that the power of the second energy storage converter is a second power; Determine the sum of the first power and the second power by the first energy storage converter to obtain a target value; When it is determined that the target value is greater than a preset threshold value, the first AC contactor is disconnected through the first energy storage inverter, and a tripping instruction is simultaneously sent to the second energy storage inverter to instruct the second energy storage inverter to disconnect the second AC contactor, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

4. The method according to claim 1, characterized in that: The method further comprises: When it is detected that the first AC contactor is in a disconnected state, a tripping instruction is sent to the second energy storage inverter through the first energy storage inverter to instruct the second energy storage inverter to disconnect the second AC contactor, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

5. The method according to claim 1, characterized in that The method further comprises: When a tripping instruction sent by the second energy storage inverter is obtained, the first AC contactor is disconnected through the first energy storage inverter, wherein the tripping instruction is an instruction sent by the second energy storage inverter when it detects that the second AC contactor is in a disconnected state, wherein the first energy storage inverter is electrically connected to the other end of the power isolation transformer through the first AC contactor, and the second energy storage inverter is electrically connected to the other end of the power isolation transformer through the second AC contactor.

6. The method according to any one of claims 3 to 5, characterized in that The tripping instruction is transmitted through the target optical fiber transmission channel between the first energy storage converter and the second energy storage converter.

7. A test power setting device for an energy storage converter, characterized in that: Applied to an energy storage converter test system, the energy storage converter test system comprises: a high-voltage power grid, a power isolation transformer, a first energy storage converter and a second energy storage converter; wherein the high-voltage power grid is electrically connected to one end of the power isolation transformer, and the first energy storage converter and the second energy storage converter are electrically connected to the other end of the power isolation transformer respectively, comprising: a sending module, configured to send a first optical fiber signal to the second energy storage converter based on a target optical fiber transmission channel through the first energy storage converter when the first energy storage converter receives a setting instruction, wherein the setting instruction is used to set the power of the first energy storage converter to a first power, the first optical fiber signal is used to indicate that the power of the first energy storage converter is the first power, and the target optical fiber transmission channel is the optical fiber transmission channel between the first energy storage converter and the second energy storage converter; The indication module is used to instruct the second energy storage inverter to set the power of the second energy storage inverter based on the received optical fiber signal, so that the sum of the set second power of the second energy storage inverter and the power indicated in the received optical fiber signal is zero.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method according to any one of claims 1 to 6 when executed.

9. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 6 through the computer program.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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