Test device for back-to-back type double-chain-link SVG power module detection

Abstract

The utility model discloses a testing device for back-to-back double-chain-link SVG power module detection. The testing device comprises a switch, a transformer T1, a transformer T2, a rectifier D1, a rectifier D2, a controller and a discharge resistor R, one end of the switch is connected with a power supply, and the other end is connected with the transformer T1 main winding, the transformer T2 main winding and the controller; a secondary winding of the transformer T1 is connected with a rectifier D1, and the rectifier D1 is connected with one H-bridge circuit; a secondary winding of the transformer T2 is connected with a rectifier D2, and the rectifier D2 is connected with the other H-bridge circuit; the controller is connected with the back-to-back power module; positive electrode output lines of the rectifier D1 and the rectifier D2 are connected through a contactor K1, negative electrode output lines of the rectifier D1 and the rectifier D2 are connected through a contactor K2, and the two ends of a discharge resistor R are connected between the contactor K1 and the contactor K2 through a contactor K3; therefore, the back-to-back type double-chain-link SVG power module can be detected.

Description

Technical Field

[0001] The utility model belongs to the field of power quality detection and relates to a test device for detecting a back-to-back double-chain-link SVG power module. Background Art

[0002] At present, SVG power module technology is relatively mature. In the context of cost reduction, efficiency improvement and streamlined structure, a cascaded back-to-back power module has emerged. This power module adopts modular design and is highly integrated internally. The back contains two cascaded H-bridge circuit topologies to achieve a one-control dual-drive architecture, saving the number of modules and control boards, reducing design costs, and having high working performance.

[0003] Therefore, in the early stage of the module being put into the grid, it is particularly important to detect the working principle of the power module and whether the working performance is stable and reliable. However, the existing SVG power module detection devices are all for detecting SVG power modules with single H-bridge circuits, and there is currently no device for detecting back-to-back power modules. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a test device for detecting back-to-back double-link SVG power modules, which can detect back-to-back double-link SVG power modules and ensure the safety of test operations.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A test device for back-to-back double-link SVG power module detection, comprising a switch, a transformer T1, a transformer T2, a rectifier D1, a rectifier D2, a controller and a discharge resistor R;

[0007] One end of the switch is connected to the power supply, and the other end is connected to the main winding of the transformer T1, the main winding of the transformer T2 and the controller; the secondary winding of the transformer T1 is connected to the rectifier D1, and the rectifier D1 is connected to one of the H-bridge circuits of the back-to-back power module; the secondary winding of the transformer T2 is connected to the rectifier D2, and the rectifier D2 is connected to the other H-bridge circuit of the back-to-back power module; the controller is connected to the back-to-back power module;

[0008] The positive output lines of the rectifier D1 and the rectifier D2 are connected by contactor K1, the negative output lines of the rectifier D1 and the rectifier D2 are connected by contactor K2, and the two ends of the discharge resistor R are connected between the contactor K1 and the contactor K2 by contactor K3.

[0009] Preferably, the switch is connected with a fuse FU, and the fuse FU is connected to the main winding of the transformer T1, the main winding of the transformer T2 and the switching power supply.

[0010] Preferably, the transformer T1 is a three-winding transformer.

[0011] Furthermore, the first secondary winding of the transformer T1 is connected to the rectifier D1 , the second secondary winding of the transformer T1 is connected to the contactor K4 , the contactor K4 is connected to the inductor L , and the inductor L is connected to the back-to-back power module.

[0012] Preferably, a switching power supply is provided between the switch and the controller.

[0013] Preferably, the controller is provided with function buttons, LED indicator lights and a digital tube display.

[0014] Preferably, the controller is connected to the back-to-back power modules using optical fibers.

[0015] Preferably, the controller adopts an FPGA power module controller.

[0016] Preferably, the switch is a push button switch.

[0017] Preferably, the power supply adopts industrial frequency 220V power supply.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model uses two transformers and two rectifiers to simultaneously supply power to two H-bridge circuits of a back-to-back power module. A controller controls the power module, controls the start-up, shutdown and function detection of the power module. After the power module test is completed, the contactors K1, K2 and K3 are controlled to be closed, and the power module is quickly discharged through the discharge resistor R to ensure the safety of the test operation, thereby realizing the detection of the back-to-back double-chain SVG power module.

[0020] Furthermore, a fuse FU is provided to provide current protection for the test device.

[0021] Furthermore, the second secondary winding of the transformer T1 outputs a stable AC current through the inductor L for current detection of the power module and plays a filtering role. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a test device for testing a back-to-back double-link SVG power module of the utility model. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected, electrically connected, or can communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, and can be internal connectivity between two elements or an interactive relationship between two elements. The term "and / or" used herein includes any and all combinations of one or more related listed items. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. The terms used herein in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0028] The device of the utility model is described in detail below through Example 1.

[0029] like Figure 1 As shown, the test device for detecting the back-to-back double-link SVG power module of the utility model mainly includes a push button switch Q1, a fuse FU, a transformer T1, a transformer T2, a rectifier D1, a rectifier D2, a switching power supply, a controller, a digital tube, an inductor L, a discharge resistor R, a contactor K1, a contactor K2, a contactor K3 and a contactor K4.

[0030] The test platform is connected to the industrial frequency 220V power supply through a cable; the power supply is connected to the main winding of transformer T1, the main winding of transformer T2 and the switching power supply through the button switch Q1 and the fuse FU; the fuse FU is set to provide current protection for the test device.

[0031] Transformer T1 adopts a three-winding transformer. The second secondary winding of transformer T1 is connected to contactor K4, contactor K4 is connected to inductor L, and inductor L is connected to the back-to-back power module; the second secondary winding of transformer T1 outputs a stable AC current through inductor L for current detection of the power module and plays a filtering role.

[0032] The first secondary winding of the transformer T1 is connected to the rectifier D1, which is connected to the back-to-back power module. The secondary winding of the transformer T2 is connected to the rectifier D2, which is connected to the back-to-back power module.

[0033] The positive output lines of the rectifier D1 and the rectifier D2 are connected by contactor K1, the negative output lines of the rectifier D1 and the rectifier D2 are connected by contactor K2, and the two ends of the discharge resistor R are connected between contactor K1 and contactor K2 via contactor K3.

[0034] The switching power supply is connected to the controller, and the controller is connected to the back-to-back power module through an optical fiber. The controller has components such as function buttons, LED indicators, and a digital tube display. In this embodiment, the controller adopts an FPGA power module controller.

[0035] The controller button is used to switch the various working states of the cascaded double-link SVG power module. The LED indicator on the controller is used to display the working state and fault type of the cascaded double-link SVG power module. The digital tube display is used to display the real-time information of the power module parameters such as the voltage and core temperature of the cascaded double-link SVG power module.

[0036] The working process of the above-mentioned back-to-back double-link SVG power module testing device is described in detail through Example 2:

[0037] The test platform is powered by a 220V industrial frequency power supply, which is boosted by transformer T1 and transformer T2. After boosting, it is rectified by rectifier D1 and rectifier D2 respectively, and two isolated and stable DC600V voltages are output to power the back-to-back power modules. After the power module test is completed, the contactor K1 / contactor K2 / contactor K3 is controlled to operate, and the power module is quickly discharged through the discharge resistor R to ensure the safety of the test operation; the other winding of transformer T1 outputs a stable AC current for the power module current detection through the inductor L; the input AC220 is converted into power through the switching power supply module The power supply for the test platform controller is switched. Optical fiber is used for data exchange between the controller and the back-to-back power modules. The controller controls the power modules, including the start, shutdown and function detection of the power modules. The controller is provided with switch buttons, LED indicator lights and digital tube displays. The controller buttons are used to switch various working states of the cascaded double-chain-link SVG power modules. The LED indicator lights on the controller are used to display the working states and fault types of the cascaded double-chain-link SVG power modules. The digital tube displays are used to display the real-time information of the power module parameters such as the voltage and core temperature of the cascaded double-chain-link SVG power modules.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of the subject matter, nor should it be considered that the applicant has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A test device for testing back-to-back double-link SVG power modules, characterized in that: It includes a switch, a transformer T1, a transformer T2, a rectifier D1, a rectifier D2, a controller and a discharge resistor R; One end of the switch is connected to the power supply, and the other end is connected to the main winding of the transformer T1, the main winding of the transformer T2 and the controller; the secondary winding of the transformer T1 is connected to the rectifier D1, and the rectifier D1 is connected to one of the H-bridge circuits of the back-to-back power module; the secondary winding of the transformer T2 is connected to the rectifier D2, and the rectifier D2 is connected to the other H-bridge circuit of the back-to-back power module; the controller is connected to the back-to-back power module; The positive output lines of the rectifier D1 and the rectifier D2 are connected by contactor K1, the negative output lines of the rectifier D1 and the rectifier D2 are connected by contactor K2, and the two ends of the discharge resistor R are connected between the contactor K1 and the contactor K2 by contactor K3.

2. The test device for detecting back-to-back double-link SVG power modules according to claim 1, characterized in that: The switch is connected with a fuse FU, and the fuse FU is connected to the main winding of the transformer T1, the main winding of the transformer T2 and the switch power supply.

3. The test device for detecting back-to-back double-link SVG power modules according to claim 1, characterized in that: Transformer T1 adopts a three-winding transformer.

4. The test device for testing back-to-back double-link SVG power modules according to claim 3, characterized in that: The first secondary winding of the transformer T1 is connected to the rectifier D1 , the second secondary winding of the transformer T1 is connected to the contactor K4 , the contactor K4 is connected to the inductor L , and the inductor L is connected to the back-to-back power module.

5. The test device for detecting back-to-back double-link SVG power modules according to claim 1, characterized in that: A switching power supply is arranged between the switch and the controller.

6. The test device for testing back-to-back double-link SVG power modules according to claim 1, characterized in that: The controller is provided with function buttons, LED indicator lights and digital tube displays.

7. The test device for testing back-to-back double-link SVG power modules according to claim 1, characterized in that: The controller is connected to the back-to-back power modules using optical fiber.

8. The test device for testing back-to-back double-link SVG power modules according to claim 1, characterized in that: The controller adopts FPGA power module controller.

9. The test device for testing back-to-back double-link SVG power modules according to claim 1, characterized in that: The switch adopts a push button switch.

10. The test device for testing back-to-back double-link SVG power modules according to claim 1, characterized in that: The power supply adopts industrial frequency 220V power supply.

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