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Converter AC filter capacitor failure detection method and device, and converter system

A technology of AC filtering and detection method, applied in measurement devices, circuit devices, AC network circuits, etc., can solve the problems of filter capacitor capacitance attenuation, failure, increase system safety risks, etc., to facilitate function upgrades and avoid inrush currents. Effect

Pending Publication Date: 2022-05-06
XJ ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The operating environment of the converter is generally relatively harsh, and the filter capacitor will have capacity attenuation or failure after long-term operation. At this time, the grid-connected current harmonics will increase, which will affect the power quality of the grid and the stable operation of the converter. System Security Risk

Method used

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  • Converter AC filter capacitor failure detection method and device, and converter system
  • Converter AC filter capacitor failure detection method and device, and converter system
  • Converter AC filter capacitor failure detection method and device, and converter system

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0043] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. According to an embodiment of the present invention, a method for detecting failure of an AC filter capacitor of a converter is provided, the flow chart of the detection method is as follows figure 1 as shown, figure 2 A schematic diagram of a circuit structure of a converter AC filter...

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Abstract

The invention relates to a converter AC filter capacitor failure detection method, a detection device and a converter system, when an internal loop of a converter is not connected with a power grid, a power unit is controlled to output an AC voltage with a fixed amplitude to provide voltage support for an AC filter capacitor load, so that current is generated in the system; and the state of the AC filter capacitor is detected by collecting the current.

Description

technical field [0001] The invention relates to the related technical field of converter grid-connected control, in particular to a converter AC filter capacitor failure detection method, device and converter system. Background technique [0002] The converter is a device that realizes the conversion between direct current and alternating current. It mainly includes key components such as switching devices, control systems, sampling halls, power devices, bus capacitors, filter inductors, and filter capacitors. The control system controls the conduction of power devices. In the on-state, realize four-quadrant operation and complete the conversion between AC and DC. At present, converters have been widely used in wind power, photovoltaic, energy storage, subway regenerative braking and other fields, providing strong support for new energy utilization and grid stability. [0003] In order to improve the grid-connected power quality of the converter, a filter is installed betwe...

Claims

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Application Information

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IPC IPC(8): G01R31/00H02J3/38
CPCG01R31/00H02J3/381
Inventor 刘刚孙健李建伟许恩泽汪海涛祁招刘重洋范书豪刘红亮
Owner XJ ELECTRIC