Real-time fault detection method applied to voltage source converter

A voltage source converter, real-time fault technology, applied in the field of electronics, can solve problems such as the complete machine can not work, the real-time fault detection has not been discussed in detail, etc.

Active Publication Date: 2016-10-12
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Problems solved by technology

[4] A fault-tolerant method for IGBT open-circuit fault detection in three-phase modular multi-level converters and its sub-modules (application number: 201310198506.3), which discloses the problem that the existing MMC cannot work due to open-circuit faults
The above simulation based on the power electronic system makes a detailed discussion on the problems of transient simulation, digital modeling and faults, but does not discuss in detail the problems of power electronic model segmentation and real-time fault detection.

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  • Real-time fault detection method applied to voltage source converter
  • Real-time fault detection method applied to voltage source converter
  • Real-time fault detection method applied to voltage source converter

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] This embodiment adopts the three-phase two-level inverter main circuit topology of the SimPowerSystem instance model, and its control part adopts a voltage single closed-loop control strategy. Its topology is mainly composed of DC side, three-phase inverter bridge, LC filter, measurement unit and load.

[0039] like Figure 1 to Figure 6 As shown, this embodiment provides a real-time fault detection method applied to a voltage source converter, which specifically includes the following steps:

[0040] Step S1: Perform single-rate offline simulation on the simulation example of the three-phase two-level inverter closed-loop control model in the Matlab simulation environment; figure 1 As shown, the three-phase two-level inverter closed-loop control simulation example model is divided into a fast inverter sub-model and a slow control sub-model by us...

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Abstract

The invention relates to a real-time fault detection method applied to voltage source converter. Continuous discrete separation is carried out on a power electronic model, linear and non-linear models are extracted, and a multi-speed coordinative simulation system is utilized to carry out real-time simulation test analysis on a high-frequency switch device. Transient disturbance and stable disturbance are distinguished by high frequency wavelet decomposition coefficients obtained after frequency domain segmentation by a Mallat decomposition method. Fault beginning and ending time is determined by transient signals according to a model maximum value point, and the model maximum value in the fault time is used as a threshold for judging whether a fault occurs. Wavelet entropy transient characteristic extraction is carried out the high frequency decomposition coefficients, and when the frequency domain calculation result is inaccurate, the wavelet decomposition coefficient entropy is calculated to determine the phase having the fault.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a real-time fault detection method applied to a voltage source converter. Background technique [0002] In recent years, renewable energy such as wind energy and solar energy has developed vigorously. The power system composed of converters has become the mainstream structure of future grid interconnection because of its flexible operation and good controllability. The power electronic device used in the fields of AC and DC grid interconnection, distributed energy grid connection, reactive power dynamic compensation and other fields of power system is a complex nonlinear time-varying element. Its high-frequency converter also has many problems (such as faults, harmonics, control and protection, etc.), which have attracted widespread attention from scholars. In order to improve its reliability and ensure safe operation, a large number of simulation tests must be carried out o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40
CPCG01R31/40
Inventor 张逸吴文宣林焱黄道姗吴丹岳熊军
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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