Intelligent testing device for energy storage power supply inverter

Abstract

The utility model provides an intelligent testing device for an energy storage power supply inverter, which comprises a DC power supply and at least one group of units to be tested, and is characterized in that the DC power supply is connected with the units to be tested and provides input voltage and load for the units to be tested; the to-be-tested unit comprises a control panel, a first inverter and a second inverter; one end of the first inverter is connected with the output end of the DC power supply, and the other end of the first inverter is connected with one end of the second inverter; the other end of the second inverter is connected with the input end of the DC power supply; the control panel respectively controls the working states of the first inverter and the second inverter, and receives and outputs the states of the first inverter and the second inverter; according to the technical scheme, the structure is simple, operation is easy, meanwhile, energy is output from the output end of the DC power source and finally returns to the DC power source from the input end of the DC power source, the energy during aging is recycled, and energy power consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of inverter testing, in particular to an intelligent testing device for an energy storage power inverter. Background Art

[0002] An inverter is a power converter product that converts direct current into alternating current and is commonly used in outdoor energy storage products. The performance stability and reliability of the inverter are crucial to the operation of the entire power generation system. Therefore, quality inspection is an essential step in the production and use of inverters, from inverter power product development to mass production and shipment. Inverter aging testing is a crucial component of inverter quality inspection. Inverter aging can lead to decreased performance stability and reliability, and may even cause failures, seriously affecting the operating efficiency and safety of the power generation system. The inverter aging test primarily operates the inverter under certain external conditions of temperature and humidity for a period of time, during which time its various operating parameters and component wear are tested. The purpose is to improve the performance of the inverter product and increase the yield rate.

[0003] Existing inverter aging tests mainly rely on manual testing of various devices, which consumes a lot of manpower and time. The entire process requires dedicated monitoring to prevent the loss of test data and accuracy. See authorization announcement number CN204166110 U for an energy-saving inverter aging test device, in which an AC / DC conversion circuit is connected to the mains power grid; a group of inverter aging test arrays are connected to the AC / DC conversion circuit or at least two groups of inverter aging test arrays are connected in parallel to the AC / DC conversion circuit; each group of inverter aging test arrays is composed of 2-10 inverter aging test units connected in series, and then connected in series with an adjustable load. Although the device requires dozens of times less power consumption than existing inverter aging test equipment, greatly saving power supply equipment and no longer wasting precious electricity on resistors, its structure is complex and the energy consumption saved is limited. Utility Model Content

[0004] Therefore, it is necessary to provide an intelligent test device for energy storage power inverter, which provides a DC→AC→DC closed-loop method to perform aging tests on two inverters, and solve the problems of complex test device structure and high energy consumption.

[0005] To achieve the above object, the present invention provides an intelligent test device for an energy storage power inverter, which includes a DC power supply and at least one group of units to be tested.

[0006] The DC power supply is connected to the unit under test to provide input voltage and load for the unit under test;

[0007] The unit to be tested includes a control panel, a first inverter, and a second inverter; one end of the first inverter is connected to the output end of a DC power supply, and the other end is connected to one end of the second inverter; the other end of the second inverter is connected to the input end of the DC power supply; the control panel controls the working states of the first inverter and the second inverter respectively, and receives and outputs the test results of the first inverter and the second inverter.

[0008] Furthermore, the control panel is connected to an indicator light, so that the control panel outputs the test results of the first inverter and the second inverter and displays them through the indicator light.

[0009] Furthermore, it also includes a host computer, which is connected to the control panel to read parameter information of the first inverter and the second inverter and control the working status of the first inverter and the second inverter; and is connected to a DC power supply to control the DC power supply voltage value.

[0010] Furthermore, it also includes an AC load, which is connected between the unit under test and the DC power supply to provide a load for the unit under test; the host computer is connected to the AC load to control the state of the AC load.

[0011] Furthermore, it also includes a power analyzer, which collects the actual input and output voltages, actual input and output current values, and actual input and output powers of each inverter of the unit to be tested when it is working; the host computer is connected to the power analyzer to receive the data collected by the power analyzer.

[0012] Furthermore, it also includes a display unit, which is connected to the host computer to display data read and / or received by the host computer.

[0013] Furthermore, the unit under test further includes a radiator, which dissipates heat for the first inverter and the second inverter.

[0014] Furthermore, the units to be tested include multiple groups, and the multiple groups of units to be tested are connected in parallel to a DC power supply.

[0015] Different from the existing technology, the above technical solution forms a test unit by connecting two inverters in series. The first inverter inverts the DC voltage of the DC power supply into AC voltage and outputs it to the second inverter. After receiving the AC voltage, the second inverter converts the DC voltage into DC voltage to charge the DC power supply. Therefore, the DC power supply serves as both the power supply and the load of the inverter. Its structure is simple. Then, through the DC power supply → first inverter → second inverter → DC power supply, a DC → AC → DC closed-loop method is implemented to perform aging tests on the two inverters. The working status of the first inverter and the second inverter is controlled by a control panel. Its operation is simple and the use of human resources is reduced. At the same time, energy is output from the output end of the DC power supply and finally returns to the DC power supply from the input end of the DC power supply, so that the energy during aging is recovered and reused, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the intelligent testing device for energy storage power inverter described in the present utility model;

[0017] Figure 2 It is a structural diagram of an intelligent testing device for energy storage power inverter according to a specific embodiment;

[0018] Figure 3 A state flow chart of a control panel of an intelligent test device for an energy storage power inverter according to a specific embodiment;

[0019] Figure 4 It is a structural diagram of an intelligent testing device for energy storage power inverter according to a specific embodiment;

[0020] Figure 5 Schematic diagram of the host computer reading the AC load, strategy analyzer, and DC power supply in a specific implementation method;

[0021] Figure 6 A schematic diagram of a host computer reading an inverter according to a specific implementation method;

[0022] Figure 7 The figure is a working principle diagram of the control panel of a specific implementation method.

[0023] Description of reference numerals:

[0024] 10. DC power supply;

[0025] 20. Unit under test;

[0026] 201. First inverter; 202. Second inverter; 203. Control panel; 204. Radiator;

[0027] 30. AC load;

[0028] 40. Power analyzer;

[0029] 50. Host computer. DETAILED DESCRIPTION

[0030] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0031] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0032] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0033] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0034] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0035] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0036] Consistent with the understanding in the Patent Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups" and "multiple times," unless otherwise clearly and specifically limited.

[0037] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0038] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] See also Figure 1-Figure 7 As shown, the utility model provides an intelligent test device for energy storage power inverter, which is composed of two inverters connected in series to form a test unit. The first inverter 201 inverts the DC voltage of the DC power supply 10 into AC voltage and outputs it to the second inverter 202. After receiving the AC voltage, the second inverter 202 converts the DC voltage into DC voltage to charge the DC power supply 10 (see Figure 1As shown, the DC power supply 10 serves as both the power supply and the load of the inverter, and has a simple structure. A closed-loop DC→AC→DC method is implemented to perform aging tests on the two inverters in the manner of DC power supply 10→first inverter 201→second inverter 202→DC power supply 10. The control panel 203 is used to control the working states of the first inverter 201 and the second inverter 202, and the operation is simple, reducing the use of human resources. At the same time, energy is output from the output end of the DC power supply 10 and finally returns to the DC power supply 10 from the input end of the DC power supply 10, so that energy during aging is recovered and reused, thereby reducing energy consumption.

[0040] The following further describes an intelligent testing device for an energy storage power inverter of the present invention.

[0041] See also Figure 2 As shown, an intelligent test device for energy storage power inverter includes a DC power supply 10 and at least one set of units to be tested 20.

[0042] The DC power supply 10 is connected to the unit under test 20 to provide input voltage and load for the unit under test 20;

[0043] The unit under test 20 includes a control panel 203, a first inverter 201, and a second inverter 202; one end of the first inverter 201 is connected to the output end of the DC power supply 10, and the other end is connected to one end of the second inverter 202; the other end of the second inverter 202 is connected to the input end of the DC power supply 10; the control panel 203 controls the working status of the first inverter 201 and the second inverter 202 respectively, and receives and outputs the test results of the first inverter 201 and the second inverter 202.

[0044] The DC power supply 10 may be a source of electricity generated by solar cells, storage batteries, wind energy, nuclear energy, etc. The first inverter 201 and the second inverter 202 are inverters to be tested for aging. An inverter is a device that converts direct current (DC) into alternating current (AC), and is generally composed of an inverter bridge, control logic, and a filter circuit. The inverter to be tested for aging may be a coal-fired power inverter, a solar / photovoltaic inverter, a wind power inverter, a nuclear power inverter, etc. The first inverter 201 converts the DC voltage in the DC power supply 10 into an AC voltage and outputs it to the second inverter 202; the second inverter 202 receives the AC voltage and converts it into a DC voltage to charge the DC power supply 10.

[0045] The control panel 203 is used to control the operating status of the first inverter 201 and the second inverter 202. The operating status may include the startup configuration (such as the operating voltage and AC frequency), the start and stop status of the first inverter 201 and the second inverter 202, etc. For example, the control panel 203 can set the operating voltage and AC frequency of the first inverter 201 and the second inverter 202, and then start the first inverter 201 and the second inverter 202, that is, start the aging process of the first inverter 201 and the second inverter 202; the control panel 203 can stop the first inverter 201 and the second inverter 202, that is, stop the aging process of the first inverter 201 and the second inverter 202. The control panel 203 outputs different signals based on the test results of each inverter, such as operation, failure, and stop.

[0046] In some embodiments, the control panel 203 may be implemented using one or more combinations of physical buttons, knobs, switches, etc., and the operating states of the first inverter 201 and the second inverter 202 can be controlled directly by pressing a button, rotating a knob, or toggling a switch. In some embodiments, the control panel 203 is implemented using touch screen technology, and interactive operations can be performed through one or more combinations of icons, buttons, and menus on the touch screen, providing a more intuitive, flexible, and customizable control interface to control the operating states of the first inverter 201 and the second inverter 202. Of course, in some embodiments, the control panel 203 can also be implemented using an automated program, that is, different control logics and operating procedures are defined through programming languages, controllers, or PLCs (programmable logic controllers), etc., to achieve automated control of the operating states of the first inverter 201 and the second inverter 202, see. Figure 7 The above embodiments are merely examples of individual implementations of the control panel 203 and do not represent that there are only the above three implementations, nor do they limit the implementation of the control panel 203 of the present invention.

[0047] When performing aging tests on two inverters, the control panel 203 outputs signals expressing the test results of the first inverter 201 and the second inverter 202 , which can be displayed by indicator lights, a display unit, or output through speaker broadcasting.

[0048] In some embodiments, the test results are displayed by indicator lights, that is, the control panel 203 is connected to the indicator lights, and the connection of the control panel 203 can be a direct connection or an indirect connection to the indicator lights, so that the control panel 203 outputs the test results of the first inverter 201 and the second inverter 202 directly through the indicator lights. The above-mentioned indirect connection can be that the control panel 203 is connected to the transmission unit and / or the host computer 50, and then connected to the indicator lights. The indicator lights can be on, off, flashing, and / or different colors to express different test results of the first inverter 201 and the second inverter 202 in the unit to be tested 20, so that the tester can directly judge whether the inverter is working normally and the working status by observing the status of the indicator lights, thereby improving the simplicity and efficiency of the operation.

[0049] See also Figure 3 As shown, after the energy storage power inverter intelligent test device is connected, the DC power supply 10 and the unit under test 20 are connected, so that the DC power supply 10 provides power and load to the unit under test 20. The blue indicator light can be permanently lit to indicate that the energy storage power inverter intelligent test device is connected correctly and the DC power supply 10 is normally supplying power to the unit under test 20. This can also indicate that the aging process of the unit under test 20 has stopped. When the control panel 203 controls the first inverter 201 and the second inverter 202 to start the aging test, the indicator light will be permanently lit green after both inverters start normally. When one inverter starts normally, the indicator light will flash green, and the flashing frequency can be used to distinguish which of the first inverter 201 and the second inverter 202 is operating normally. During the aging test, if one inverter fails, the indicator light will flash red, and the flashing frequency can be used to distinguish which of the first inverter 201 and the second inverter 202 is faulty. If both inverters fail, the indicator light will be permanently lit red.

[0050] See also Figure 4 As shown, in actual applications, a host computer 50 may also be included. The host computer 50 may also read and / or receive data from a component or unit during the start-up aging test, and may also set or control the working state of a component through instructions. For example, the host computer 50 may monitor the working state of the first inverter 201 and the second inverter 202 in real time, which greatly helps in data testing and troubleshooting. Therefore, the aging test is more efficient and the results are more accurate. Figure 6As shown, in some specific implementations, the host computer 50 can obtain parameter information of the first inverter 201 and the second inverter 202, and the parameter information includes software version, hardware version, rated power, etc., such as the host computer 50 is connected to the control panel 203, and the control panel 203 reads the parameter information of the first inverter 201 and the second inverter 202 through TTL signals; or the host computer 50 directly reads the parameter information of the first inverter 201 and the second inverter 202 through TTL signals; it can also control the working status of the first inverter and the second inverter through instructions, that is, modify the inverter startup configuration accordingly, such as the working voltage and AC frequency, that is, the corresponding output AC / DC voltage and current value is determined by the inverter model; at the same time, faults can be quickly diagnosed and located during aging tests, reducing the time and cost of troubleshooting.

[0051] See also Figure 4 As shown, the host computer 50 can also control the voltage value of the DC power supply 10, that is, the host computer 50 is connected to the DC power supply 10 to control the voltage value of the DC power supply 10. Figure 5 As shown, in some specific implementations, the host computer 50 is connected to the DC power supply 10 via an RS232 to RS485 converter to control the voltage value of the DC power supply 10 in real time. Through the host computer connection, the voltage value of the DC power supply 10 can be monitored and adjusted in real time to achieve precise control of the voltage. The aging of the inverter can be tested at different specific voltage values ​​to improve the efficiency and reliability of the inverter aging test.

[0052] See also Figure 4 As shown, an additional layer of protection is added to stabilize the voltage, thereby improving stability. An AC load 30 may also be included. The AC load 30 is connected between the unit under test 20 and the DC power supply 10 to provide a load for the unit under test 20. The host computer 50 is connected to the AC load 30 to control the state of the AC load 30. The AC load 30 is connected between the unit under test 20 and the DC power supply 10 to simulate the actual load conditions of the unit under test 20, perform performance and stability tests on the unit under test 20, and help evaluate the performance of the unit under test 20 under different load conditions. Figure 5 As shown, in some specific implementations, the host computer 50 is connected to the AC load 30 through an RS232 to RS485 converter to control the state of the AC load 30 to control the power of the AC load 30, and can monitor and adjust the voltage value of the AC load 30 in real time to achieve precise control of the power of the AC load 30, and test the aging of the inverter with different specific load powers to improve the efficiency and reliability of the inverter aging test.

[0053] See also Figure 4As shown, in order to monitor and analyze the aging test data of the unit under test 20 in real time, a power analyzer 40 may also be included. The power analyzer collects the actual input and output voltages, actual input and output current values, and actual input and output power of each inverter of the unit under test 20 when it is working; the host computer 50 is connected to the power analyzer 40 to receive the data collected by the power analyzer 40. Figure 5 As shown, in some specific implementations, the host computer 50 is connected to the power analyzer 40 through an RS232 to RS485 converter, and the data collected by the power analyzer 40 is transmitted to the host computer 50. The host computer 50 receives the data collected by the power analyzer 40, and the host computer 50 obtains the actual input and output voltages, actual input and output current values, and actual input and output power of each inverter of the unit under test 20 during the aging test. The old data is further analyzed and processed to use the analyzed and processed data to monitor the test results of the first inverter 201 and the second inverter 202, such as reasons for abnormal startup, failure, and abnormal stop.

[0054] See also Figure 2 As shown, the first inverter 201 and the second inverter 202 generate heat during operation. In high-temperature environments, the inverters may experience current overloads, voltage fluctuations, and other issues, thereby affecting the accuracy and reliability of the aging test. To this end, the above embodiment can be further improved, where the unit under test 20 also includes a heat sink 204, which dissipates heat from the first inverter 201 and the second inverter 202. The heat sink 204 can effectively dissipate this heat, thereby reducing the temperature of the inverters, preventing overheating, and improving the reliability of the aging test. The heat sink 204 can be a fan, a heat sink, a cooling medium, or the like. If the heat sink 204 is a fan, the rotation of the fan generates airflow, which removes heat from the first inverter 201 and the second inverter 202. The heat dissipation effect can be adjusted by controlling the fan speed. For example, the radiator 204 can be a heat sink with good thermal conductivity, through which heat is transferred from the first inverter 201 and the second inverter 202 to the surface of the heat sink, and the heat is dissipated through the heat dissipation effect of the heat sink; the heat sink can be made of materials such as aluminum alloy and copper, which have good heat dissipation effect. For another example, the radiator 204 is a cooling medium. During operation, the first inverter 201 and the second inverter 202 generate heat that is transferred to the cooling medium, which absorbs the heat. The cooling medium can be water-cooled or a special heat dissipation liquid, which has good heat dissipation effect. Preferably, the radiator 204 is connected to the control panel 203, and the control panel 203 controls the operating state of the radiator 204, thereby realizing automatic control of the radiator 204.

[0055] The control panel 203 may further include a display unit connected to the host computer 50. The display unit can display data read and / or received by the host computer 50. The host computer 50 can also receive test results of the first inverter 201 and the second inverter 202 output by the control panel 203, and display the test results of the first inverter 201 and the second inverter 202 on the display unit. The display unit can also display parameter information of the first inverter 201 and the second inverter 202.

[0056] See also Figure 2 As shown, the units under test 20 are multiple groups, and the multiple groups of units under test 20 are connected in parallel to the DC power supply 10. Multiple groups of units under test 20 are connected in parallel to the DC power supply 10, allowing multiple groups of units under test 20 to undergo aging tests simultaneously, thereby improving aging efficiency. At the same time, each unit under test 20 undergoes an independent aging test. If one unit under test 20 fails, the other units under test 20 can continue aging tests without interfering with each other, ensuring the normal operation of the energy storage power inverter intelligent test device and avoiding downtime of the entire energy storage power inverter intelligent test device caused by a single unit under test 20.

[0057] In order to further understand the present invention, a specific implementation is provided below.

[0058] In this embodiment, the DC charging parameters are set to 14V 14A;

[0059] At this time, the working power of the inverter is about 240W, but the actual power consumption of the AC load 30 is only about 50W, achieving the effect of reducing power consumption.

[0060] The utility model can connect multiple sets of inverter aging modules in parallel while using one power supply and one load, so the requirements for equipment and space are low, thereby having the advantage of low cost.

[0061] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present utility model. Therefore, based on the innovative concept of the present utility model, changes and modifications to the embodiments described herein, or equivalent structural or process transformations made using the contents of the present utility model specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields are all included in the scope of protection of the present utility model patent.

Claims

1. An intelligent test device for energy storage power inverter, characterized in that: including a DC power supply and at least one set of units to be tested, The DC power supply is connected to the unit under test to provide input voltage and load for the unit under test; The unit to be tested includes a control panel, a first inverter, and a second inverter; one end of the first inverter is connected to the output end of a DC power supply, and the other end is connected to one end of the second inverter; the other end of the second inverter is connected to the input end of the DC power supply; the control panel controls the working states of the first inverter and the second inverter respectively, and receives and outputs the test results of the first inverter and the second inverter.

2. The intelligent testing device for energy storage power inverter according to claim 1, characterized in that: The control panel is connected to the indicator light so that the control panel outputs the test results of the first inverter and the second inverter and displays them through the indicator light.

3. The intelligent testing device for energy storage power inverter according to claim 1, characterized in that: The system further includes a host computer connected to the control panel to read parameter information of the first inverter and the second inverter and control the working states of the first inverter and the second inverter; Connect a DC power supply to control the DC power supply voltage value.

4. The intelligent testing device for energy storage power inverter according to claim 3, characterized in that: It also includes an AC load, which is connected between the unit under test and the DC power supply to provide a load for the unit under test; the host computer is connected to the AC load to control the state of the AC load.

5. The intelligent testing device for energy storage power inverter according to claim 3, characterized in that: Also included is a power analyzer, which collects the actual input and output voltages, actual input and output current values, and actual input and output power of each inverter of the unit under test when it is working; The host computer is connected to the power analyzer to receive data collected by the power analyzer.

6. The intelligent testing device for energy storage power inverter according to claim 3, characterized in that: The device also includes a display unit, which is connected to the host computer to display data read and / or received by the host computer.

7. The intelligent testing device for energy storage power inverter according to claim 1, characterized in that: The unit under test further includes a radiator, which dissipates heat for the first inverter and the second inverter.

8. The intelligent testing device for energy storage power inverter according to claim 1, characterized in that: The units to be tested include multiple groups, and the multiple groups of units to be tested are connected in parallel to a DC power supply.

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