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Active power filter selective harmonic compensation control method

A power filter and harmonic compensation technology, applied in the field of harmonic compensation, can solve problems such as complex algorithms and inability to specify harmonic compensation, and achieve the effect of simple implementation

Active Publication Date: 2013-12-04
陈锡忠
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the current technical solution, which is to extract the Nth harmonic through the voltage N-multiple frequency phase-locked loop and the N-multiple frequency selection transformation matrix Cn. The algorithm is complex and can only selectively compensate reactive power, not For the problem of specifying harmonic compensation, provide a method with simple algorithm, save the complicated sub-harmonic detection link, and directly realize the specified harmonic compensation method through the core controller

Method used

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  • Active power filter selective harmonic compensation control method

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Embodiment

[0028] A selective harmonic compensation control method for an active power filter (see attached figure 1 ) The hardware device adopting this method includes sampling conditioning circuit, core control circuit, drive circuit and active power filter, and the core control circuit includes harmonic detection device, harmonic current regulator, fundamental wave current regulator and DC voltage regulator In this embodiment, the active power filter generates a current whose phase is opposite to that of the load harmonic current, which is input to the grid through an LCL filter to offset the harmonic components in the grid.

[0029] The active power filter is a 200kW three-phase voltage source inverter VSI, which has 9 IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), and the switching frequency of the IGBT is 6.4kHz. The LCL filter includes inverter side inductance L1, capacitor C and grid side inductance L2; L1=0.08mH, L2=0.04mH, C=141F.

[0030] Step 1...

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Abstract

The invention discloses an active power filter selective harmonic compensation control method based on a frequency self-adaptive resonant controller. The active power filter selective harmonic compensation control method comprises the steps of acquiring power grid voltage, load current, active power filter output current and active power filter direct-current-side voltage; controlling output through an independent direct current control and independently controlling harmonic current through an independent control fundamental current according to a load signal; obtaining a modulation signal according to fundamental current control output and harmonic current control output and generating a switch signal of a controlling grid-connected inverter according to the modulation signal. The active power filter selective harmonic compensation control method can achieve selective harmonic compensation to load harmonic current and keep the compensation effect at rated frequency under the power grid frequency fluctuation condition.

Description

technical field [0001] The invention relates to a harmonic compensation method, in particular to a selective harmonic compensation control method for an active power filter. Background technique [0002] With the rapid development of power electronics technology and the continuous emergence and maturity of various power electronic devices, flexible AC transmission, high-voltage DC transmission, microgrid and smart grid become possible. The wide application of power electronic devices will also aggravate the power quality problems of the power grid. Therefore, it is of great significance to develop high-performance active power filters to meet the needs of harmonic control. With selective harmonic compensation strategy APF has flexible compensation functions: 1) When the load harmonic current exceeds the compensation capacity of APF, you can choose to compensate only the characteristic harmonics that are more harmful; 2) When the passive filter and When the APF is used toge...

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/20
Inventor 陈锡忠
Owner 陈锡忠
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