SVG (Static Var Generator) module powered by dual power supplies

Abstract

The utility model discloses an SVG module powered by dual power supplies, which comprises a plurality of SVG sub-modules, each SVG sub-module comprises a direct current side bus capacitor, an H-bridge power unit, a module control board, a first switching power supply and a second switching power supply, the H-bridge power units of the plurality of SVG sub-modules are cascaded in a chained manner, the module control board is connected with the first switching power supply, and the second switching power supply is connected with the second switching power supply. And the first switching power supply and the second switching power supply respectively supply power to the module control board. The switching power supply comprises the first switching power supply and the second switching power supply which are in a redundant relationship, when one switching power supply fails due to internal faults of the power supply, the output of the other normal switching power supply is not influenced to continuously supply power to the module control panel, so that the module control panel is ensured not to lose power, and the service life of the module control panel is prolonged. Therefore, the SVG module can work continuously without being affected, SVG module faults caused by switching power supply faults are reduced, the fault rate of products is reduced, and the product quality is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of power electronics industry, and in particular to an SVG module that uses dual power supply. Background Technology

[0002] Chain topology, especially cascaded topology, is widely used in high-voltage, high-capacity power electronic equipment, such as high-voltage direct-connected SVG (Static Var Generator). It also has broad application prospects in high-voltage cascaded energy storage, high-voltage frequency converters, wind power converters, and other high-voltage, high-power applications.

[0003] In the SVG industry, with increasingly fierce market competition, not only are high-performance products required, but product quality also faces significant challenges. This is especially true for chain topologies, which use numerous cascaded modules. If one module fails, the entire device will malfunction. Furthermore, among SVG modules, vulnerable components are not limited to power semiconductor switches. Power supply failures causing power loss to the module control board are not uncommon, leading to equipment downtime and causing numerous problems for both users and suppliers.

[0004] Therefore, there is an urgent need to design an SVG module to reduce the occurrence of SVG module failures caused by switching power supply failures. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide an SVG module with dual power supply to reduce the occurrence of SVG module failure due to switching power supply failure.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An SVG module with dual power supply includes multiple SVG sub-modules. Each SVG sub-module includes a DC-side bus capacitor, an H-bridge power unit, a module control board, a first switching power supply, and a second switching power supply. The H-bridge power units of the multiple SVG sub-modules are cascaded in a chain. The first switching power supply and the second switching power supply respectively supply power to the module control board.

[0008] Preferably, the first switching power supply is a DC / DC power supply, and the second switching power supply is an AC / DC power supply; the first switching power supply draws power from the DC side of the H-bridge power unit, and outputs the voltage of the DC side of the SVG submodule to the module control board after stepping down the voltage; the second switching power supply draws power from the AC side of the H-bridge power unit, and outputs the voltage of the AC output terminal of the H-bridge power unit to the module control board after rectification and stepping down the voltage.

[0009] Preferably, the positive and negative input terminals of the first switching power supply are connected to the positive and negative terminals of the DC-side bus capacitor, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board; the positive and negative input terminals of the second switching power supply are connected to the L and R terminals of the H-bridge power unit, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board.

[0010] Preferably, both the first and second switching power supplies are DC / DC power supplies; the first switching power supply draws power from the DC side of the H-bridge power unit, steps down the voltage of the DC side of the SVG submodule, and then outputs it to the module control board; the second switching power supply draws power from the DC side of the H-bridge power unit, steps down the voltage of the DC side of the SVG submodule, and then outputs it to the module control board.

[0011] Preferably, the positive and negative input terminals of the first switching power supply are connected to the positive and negative terminals of the DC-side bus capacitor, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board; the positive and negative input terminals of the second switching power supply are connected to the positive and negative terminals of the DC-side bus capacitor, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board.

[0012] Preferably, both the first and second switching power supplies are AC / DC power supplies; the first switching power supply draws power from the AC side of the H-bridge power unit, rectifies and steps down the voltage of the AC output terminal of the H-bridge power unit, and then outputs it to the module control board to power the module; the second switching power supply draws power from the AC side of the H-bridge power unit, rectifies and steps down the voltage of the AC output terminal of the H-bridge power unit, and then outputs it to the module control board to power the module.

[0013] Preferably, the positive and negative input terminals of the first switching power supply are connected to the L and R terminals of the H-bridge power unit, respectively, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board, respectively; the positive and negative input terminals of the second switching power supply are connected to the L and R terminals of the H-bridge power unit, respectively, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board, respectively.

[0014] Preferably, the positive output terminal of the first switching power supply is connected to the positive input terminal of the module control board through a first diode, the positive output terminal of the second switching power supply is connected to the positive input terminal of the module control board through a second diode, and the negative output terminals of the first and second switching power supplies are respectively connected to the negative input terminal of the module control board.

[0015] Preferably, the output voltages of the first switching power supply and the second switching power supply are the same.

[0016] Preferably, the H-bridge power unit consists of four power semiconductor switches.

[0017] The aforementioned SVG module with dual power supply includes a first switching power supply and a second switching power supply, which are redundant. When one of the switching power supplies fails due to an internal power supply fault, it does not affect the output of the other normal switching power supply to continue supplying power to the module control board, ensuring that the module control board does not lose power and that the SVG module can continue to work without being affected. This reduces the failure rate of the SVG module caused by the failure of the switching power supply, thereby significantly improving the product quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an SVG submodule in one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the SVG submodule in another embodiment of the present invention;

[0020] Figure 3 This is a structural schematic diagram of the SVG submodule in another embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] This invention provides an SVG module with dual power supply, comprising multiple SVG sub-modules. Each SVG sub-module includes a DC-side bus capacitor, an H-bridge power unit, a module control board, a first switching power supply, and a second switching power supply. The H-bridge power unit consists of four power semiconductor switches. The H-bridge power units of the multiple SVG sub-modules are cascaded in a chain. The first and second switching power supplies respectively power the module control board. The DC-side bus capacitor and the H-bridge power unit constitute the power section of the SVG sub-module, while the module control board, the first switching power supply, and the second switching power supply constitute the control section. The module control board in the control section controls the operation of the power semiconductor switches in the H-bridge power units of the power section.

[0023] The SVG module provided by this utility model uses dual power supply, including a first switching power supply and a second switching power supply, which are redundant. When one of the switching power supplies fails due to an internal power supply fault, it does not affect the output of the other normal switching power supply to continue to supply power to the module control board, ensuring that the module control board does not lose power and that the SVG module can continue to work without being affected, thereby reducing the product failure rate and significantly improving product quality.

[0024] like Figure 1 As shown, in one embodiment of this utility model, the first switching power supply is a DC / DC power supply, and the second switching power supply is an AC / DC power supply; the first switching power supply draws power from the DC side of the H-bridge power unit, and outputs the voltage of the DC side of the SVG submodule to the module control board after stepping down the voltage; the second switching power supply draws power from the AC side of the H-bridge power unit, and outputs the voltage of the AC output terminal of the H-bridge power unit to the module control board after rectification and step-down processing.

[0025] Specifically, the positive and negative input terminals of the first switching power supply are connected to the positive and negative terminals of the DC-side bus capacitor, respectively, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board, respectively; the positive and negative input terminals of the second switching power supply are connected to the L and R terminals of the H-bridge power unit, respectively, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board, respectively.

[0026] The SVG module with dual power supply provided in this embodiment includes a first switching power supply and a second switching power supply, which are redundant. When one switching power supply fails due to an internal fault, the output of the other normal switching power supply continues to power the module control board, ensuring that the module control board does not lose power and that the SVG module can continue to operate without interruption. This reduces the product failure rate and significantly improves product quality. Furthermore, the first and second switching power supplies draw power from the DC and AC sides, respectively. If the SVG module loses power on the DC side due to a power semiconductor switch failure, the second switching power supply, which draws power from the AC side, can continue to power the module control board. The module control board can continuously detect and upload the fault status of the SVG module at this time, maintaining uninterrupted communication between the main controller and the module control board, and providing the conditions for the main controller to make logical judgments.

[0027] like Figure 2As shown, in some embodiments of this utility model, both the first switching power supply and the second switching power supply are DC / DC power supplies. The first switching power supply draws power from the DC side of the H-bridge power unit, steps down the DC voltage of the SVG submodule, and outputs it to the module control board. The second switching power supply draws power from the DC side of the H-bridge power unit, steps down the DC voltage of the SVG submodule, and outputs it to the module control board. Specifically, the positive and negative input terminals of the first switching power supply are connected to the positive and negative terminals of the DC-side bus capacitor, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board. The positive and negative input terminals of the second switching power supply are connected to the positive and negative terminals of the DC-side bus capacitor, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board.

[0028] like Figure 3 As shown, in some embodiments of this utility model, both the first switching power supply and the second switching power supply are AC / DC power supplies. The first switching power supply draws power from the AC side of the H-bridge power unit, rectifies and steps down the voltage of the AC output terminal of the H-bridge power unit, and then outputs it to the module control board to power the module. The second switching power supply draws power from the AC side of the H-bridge power unit, rectifies and steps down the voltage of the AC output terminal of the H-bridge power unit, and then outputs it to the module control board to power the module. Specifically, the positive and negative input terminals of the first switching power supply are connected to the L and R terminals of the H-bridge power unit, respectively, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board, respectively. The positive and negative input terminals of the second switching power supply are connected to the L and R terminals of the H-bridge power unit, respectively, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board, respectively.

[0029] See you again Figure 1 In a preferred embodiment of this utility model, the positive output terminal of the first switching power supply is connected to the positive input terminal of the module control board through a first diode D1, the positive output terminal of the second switching power supply is connected to the positive input terminal of the module control board through a second diode D2, and the negative output terminals of the first and second switching power supplies are respectively connected to the negative input terminal of the module control board.

[0030] In this embodiment, the first switching power supply and the second switching power supply have the same output voltage. They compete to supply power to the module control board through the first diode D1 and the second diode D2.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments. All equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the present utility model.

Claims

1. An SVG module employing dual power supply, characterized in that: It includes multiple SVG sub-modules, each of which includes a DC-side bus capacitor, an H-bridge power unit, a module control board, a first switching power supply, and a second switching power supply. The H-bridge power units of the multiple SVG sub-modules are cascaded in a chain, and the first and second switching power supplies respectively power the module control board.

2. The SVG module with dual power supply as described in claim 1, characterized in that: The first switching power supply is a DC / DC power supply, and the second switching power supply is an AC / DC power supply. The first switching power supply draws power from the DC side of the H-bridge power unit, steps down the voltage of the DC side of the SVG submodule, and outputs it to the module control board. The second switching power supply draws power from the AC side of the H-bridge power unit, rectifies and steps down the voltage of the AC output terminal of the H-bridge power unit, and outputs it to the module control board.

3. The SVG module with dual power supply as described in claim 2, characterized in that: The positive and negative input terminals of the first switching power supply are connected to the positive and negative terminals of the DC side bus capacitor, respectively, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board, respectively. The positive and negative input terminals of the second switching power supply are connected to the L and R terminals of the H-bridge power unit, respectively, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board, respectively.

4. The SVG module with dual power supply as described in claim 1, characterized in that: Both the first and second switching power supplies are DC / DC power supplies. The first switching power supply draws power from the DC side of the H-bridge power unit, steps down the voltage of the DC side of the SVG submodule, and then outputs it to the module control board. The second switching power supply draws power from the DC side of the H-bridge power unit, steps down the voltage of the DC side of the SVG submodule, and then outputs it to the module control board.

5. The SVG module with dual power supply as described in claim 4, characterized in that: The positive and negative input terminals of the first switching power supply are connected to the positive and negative terminals of the DC-side bus capacitor, respectively, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board, respectively. The positive and negative input terminals of the second switching power supply are connected to the positive and negative terminals of the DC-side bus capacitor, respectively, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board, respectively.

6. The SVG module with dual power supply as described in claim 1, characterized in that: Both the first and second switching power supplies are AC / DC power supplies. The first switching power supply draws power from the AC side of the H-bridge power unit, rectifies and steps down the voltage of the AC output terminal of the H-bridge power unit, and then outputs it to the module control board to power the module. The second switching power supply draws power from the AC side of the H-bridge power unit, rectifies and steps down the voltage of the AC output terminal of the H-bridge power unit, and then outputs it to the module control board to power the module.

7. The SVG module with dual power supply as described in claim 6, characterized in that: The positive and negative input terminals of the first switching power supply are connected to the L and R terminals of the H-bridge power unit, respectively, and the positive and negative output terminals of the first switching power supply are connected to the positive and negative input terminals of the module control board, respectively. The positive and negative input terminals of the second switching power supply are connected to the L and R terminals of the H-bridge power unit, respectively, and the positive and negative output terminals of the second switching power supply are connected to the positive and negative input terminals of the module control board, respectively.

8. The SVG module with dual power supply as described in any one of claims 2-7, characterized in that: The positive output terminal of the first switching power supply is connected to the positive input terminal of the module control board through a first diode, the positive output terminal of the second switching power supply is connected to the positive input terminal of the module control board through a second diode, and the negative output terminals of the first and second switching power supplies are respectively connected to the negative input terminal of the module control board.

9. The SVG module with dual power supply as described in claim 8, characterized in that: The first switching power supply and the second switching power supply have the same output voltage.

10. The SVG module with dual power supply as described in claim 9, characterized in that: The H-bridge power unit consists of four power semiconductor switches.

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