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Filter

A filter and passive filter technology, applied in active power filtering, AC network to reduce harmonics/ripple, reactive power adjustment/elimination/compensation, etc. Complex and high cost problems, to achieve the effects of low manufacturing cost, easy to be affected by grid impedance and easy to resonate with grid impedance, and simple structure

Inactive Publication Date: 2015-10-28
吴健辉
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Problems solved by technology

[0007] The structure of the above-mentioned disclosed technology is relatively complicated, and the cost is relatively high, and the harmonics filtered out are only specific times such as 5, 7, and 11 times, and have no effect on other harmonics

Method used

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Embodiment Construction

[0018] figure 1 As shown, the present invention is composed of a power supply, an active power filter, a single-stage LC passive filter and a nonlinear load, wherein the power supply is connected in parallel with the active power filter and the single-stage LC passive filter and then connected to a non-linear Linear load connection.

[0019] The active power filter is composed of a signal detection and conditioning circuit, a DSP2812 computing module, an IPM drive circuit and an IPM power module; the output of the signal detection and conditioning circuit is connected to the input of the DSP2812 computing module, and the output of the DSP2812 computing module is connected to the IPM driving circuit The input of the IPM drive circuit is connected to the input of the IPM power module.

[0020] The single-stage LC passive filter is composed of 3 groups of inductors, capacitors and resistors, wherein the 3 groups of inductors are connected in series in the main circuit, one end i...

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Abstract

Disclosed is a filter. The filter is characterized by consisting of a power supply source, an active power filter, a single-stage LC passive filter and a nonlinear load, wherein the power supply source is connected in parallel with the active power filter and the single-stage LC passive filter and then is connected in series with the nonlinear load, and the LC passive filter mainly has harmonic wave and reactive compensation effects. The object which the active power filter compensates is system current filtered by the passive filter and at the moment, the harmonic wave content in the system current is greatly reduced, so that the requirement for the capacity of the active power filter is not high. The active filter can also improve the filtering characteristic of the LC passive filter and overcomes the disadvantages of proneness to influences of power network impedance and proneness to resonance with the power network impedance. The filter provided by the invention is a hybrid active filter which is free from interference of the power network impedance, is simple in structure and has quite low requirement for the capacity of the active filter.

Description

technical field [0001] Herein, the invention belongs to the field of electric power system power supply, and is mainly used for harmonic control and reactive power compensation. Background technique [0002] As one of the most widely used secondary energy sources in today's society, electric energy is used in a staggering amount. As electric energy is widely used in various fields, some power quality problems have emerged one after another, among which the problem of harmonic pollution in power grids is particularly prominent. [0003] The application of a large number of nonlinear loads and power electronic devices seriously distorts the voltage and current waveforms of the power system, seriously threatens the normal operation of the power grid, and even causes immeasurable economic losses. [0004] Therefore, the control of electric energy pollution is imminent. [0005] The current methods for harmonic control mainly include passive power filters, active power filters ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/20
Inventor 吴健辉
Owner 吴健辉
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