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Active power filter with fault arc detection function, and method

A power filter, arc fault technology, applied in active power filtering, electrical components, circuit devices, etc., to ensure accurate detection and elimination of interference

Active Publication Date: 2017-10-24
北京英瑞来科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no such method of judging the fault arc by using the change rate of the harmonic content rate

Method used

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  • Active power filter with fault arc detection function, and method
  • Active power filter with fault arc detection function, and method
  • Active power filter with fault arc detection function, and method

Examples

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Embodiment Construction

[0050] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] Such as figure 1 As shown, an active power filter with fault arc detection function, including voltage sensor, current sensor, sampling circuit, signal processing circuit, main control MCU, arc fault alarm circuit, switch value isolation output circuit, IGBT drive circuit and APF main circuit.

[0052] Such as figure 2 As shown, the main control MCU is connected to the voltage sensor and the current sensor through the signal processing circuit and the sampling circuit, and the main control MCU respectively performs the arc fault alarm output after the same voltage and current sampling signals are analyzed and the command current is calculated. and IGBT trigger command output; so that the device can be sampled before the characteristic current of the fault arc is filtered out, so as to ensure the accurate detection of the...

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Abstract

The invention provides an active power filter with a fault arc detection function, and a method. The filter comprises a voltage sensor, a current sensor, a sampling circuit, a signal processing circuit, a main control MCU, an arc fault alarm circuit, a switching value isolation output circuit, an IGBT drive circuit, and an APF main circuit. The current detection part of a fault arc and the current detection of active power filtering are shared, and the same detection signal is employed. The same main control unit is used for the fault arc analysis and compensation instruction current calculation, thereby enabling a device to sample a fault arc feature current before the fault arc feature current is filtered, and guaranteeing the accuracy detection of the fault arc. According to the invention, the method takes the discrimination result of current difference parameters as the precondition, employs the harmonic content change rate for the judgment of the fault arc, can effectively eliminate the interference of a nonlinear load, employs four types of judgment means for judgment, and can achieve the accurate detection of the fault arc.

Description

technical field [0001] The invention relates to the technical field of power quality detection and management, in particular to an active power filter and a method with a fault arc detection function. Background technique [0002] With the development of the power system, the requirements for the stability of the power grid are getting higher and higher, and a large number of power quality control devices are widely installed in the power grid. The installation of these power quality control devices also has a great impact on arc detection. For example, although the application of active power filter (APF) can significantly improve the harmonic and unbalanced current, when the fault arc occurs, the current in the The high-frequency harmonic components of the APF may be filtered out by the APF, so that the original fault arc detection equipment cannot detect the fault arc normally. [0003] Arc is a kind of gas discharge phenomenon, which is the instantaneous spark generated...

Claims

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Application Information

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IPC IPC(8): H02J3/18G01R31/12H02J3/01
CPCG01R31/12H02J3/01H02J3/1842Y02E40/20
Inventor 袁敞袁洋波李旷
Owner 北京英瑞来科技有限公司
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