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Control method for high-power active filter

A source filter and control method technology, applied in active power filtering, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc. Avoid overshoot and improve system filtering performance

Inactive Publication Date: 2008-07-30
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the technical problem that the DC side voltage of the existing hybrid active power filter fluctuates easily and seriously affects the filtering performance of the filter, the present invention provides a composite control method for the hybrid active power filter

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  • Control method for high-power active filter
  • Control method for high-power active filter
  • Control method for high-power active filter

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Embodiment Construction

[0022] The structure of the hybrid active filter is as follows figure 1 As shown, it is mainly composed of an active part, an output filter, a coupling transformer, a fundamental series resonant circuit and a passive part. The active part is a voltage-type inverter composed of intelligent power modules. A large capacitor C is connected to the DC terminal of the inverter, and an output filter L is connected to the AC terminal. 0 , C 0 In order to filter out the high-frequency burr caused by the on-off of the switching device, the fundamental series resonant circuit is controlled by L 1 And C 1 Composition, while L 1 , C 1 And C 2 It also functions as a single-tuned filter. The coupling transformer realizes the electrical isolation between the active part and the passive part, and can select a suitable transformation ratio according to the voltage and current levels of the active and passive parts, and connect it in parallel to the power grid. The passive part is composed of LC pas...

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Abstract

The disclosed control method for large-power active filter comprises: detecting harmonic current on power-network / load side and calculating the compensation for harmonic current; detecting the fundamental current and dc side voltage of filter branch to obtain the dc side capacitance voltage control usage; synthesizing all compensation to obtain the control signal for the inverter of an active filter. This invention avoids voltage overshoot, and improves system filter and robustness.

Description

Technical field [0001] The invention relates to a control method of a high-power active filter. Background technique [0002] With the increasing number of non-linear loads in the power grid, the harmonic content in the power grid has risen sharply, causing serious distortions in the power supply voltage waveform, seriously affecting the safe and economic operation of the power grid and electrical equipment, and endangering the normal power consumption of the majority of users and produce. The main method to solve the harmonic pollution of the power grid is to install harmonic suppression devices. Harmonic suppression devices mainly include passive power filters or active power filters. [0003] The installation of passive power filters in the power grid has always been the main method of traditional harmonic compensation. Its outstanding advantages are simple structure, high operational reliability, and low operating costs. However, the filtering performance of passive power fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 罗安赵伟帅智康范瑞祥孙贤大舒适
Owner HUNAN UNIV
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