SAPF control method for voltage source type non-linear load harmonic compensation

A non-linear load, voltage source technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc., can solve problems such as increasing equipment volume and cost, reducing harmonic compensation effects, and inconvenient engineering applications , to achieve excellent harmonic compensation effect, suppress harmonic current amplification, reduce volume and cost

Active Publication Date: 2015-10-21
泰州学院
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Problems solved by technology

[0003] In order to improve the compensation effect of SAPF (Shunt Active Power Filter, SAPF) on voltage source nonlinear loads and suppress load harmonic current amplification, the existing technologies can be divided into two categories: one is the method of changing the system resonance frequency range , this method mainly connects reactors or shunt capacitors on the AC side of the load, which has problems such as inconvenient engineering application and increased equipment volume and cost; the other method is to change the SAPF compensation bandwidth. This method selects the harmonic order compensation to eliminate the resonance excitation source, but reduces the harmonic compensation effect

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  • SAPF control method for voltage source type non-linear load harmonic compensation
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  • SAPF control method for voltage source type non-linear load harmonic compensation

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[0032] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0033] Such as figure 1 Shown: is the circuit schematic diagram of the current compensation for voltage source nonlinear loads using SAPF, the SAPF filter 100 adopts a three-phase bridge rectifier structure, and the capacitor C f , inductance L are the DC side capacitance and grid side filter inductance respectively; the voltage source nonlinear load is a three-phase uncontrolled rectifier bridge, and the DC side filter element of the voltage source nonlinear load is capacitor C d , R L is the equivalent resistance load; u g is the grid voltage, R g , L g is the grid equivalent impedance; i s i c i L They are system harmonic current, SAPF compensation current and load current respectively.

[0034] Such as figure 2 As shown, it is the schematic circuit diagram of the SAPF control for harmonic compensation in the present invention, the voltage source t...

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Abstract

The invention relates to a shunt active power filter (SAPF) control method for voltage source type non-linear load harmonic compensation. The method comprises the following steps: step one, obtaining a synchronous signal theta e of a system voltage us; step 2, generating an active power component Pdc of a harmonic instruction current by a PI voltage controller; step 3, generating an SAPF harmonic compensation instruction current iLh* by a harmonic current detection link; step 4, carrying out extraction based on a harmonic voltage detection link to obtain a PCC harmonic voltage ush; step 5, generating an integrated harmonic instruction current ih*; step 6, detecting an SAPF output compensation current ic, calculating a current deviation value delta i based on a formula: delta i = ih*-ic, inputting the obtained current deviation value delta I into a PI current controller to generate a modulating wave voltage u of the PI current controller; and step 7, carrying out PWM trigger pulse outputting on the generated modulating wave voltage u by a space vector pulse width modulation way. The method can be operated conveniently; the compensation result on the voltage source type non-linear compensation by the SAPF can be improved effectively; the current amplification on the voltage source type non-linear load can be suppressed; and the method is safe and reliable.

Description

technical field [0001] The invention relates to a control method, in particular to a SAPF (Shunt Active Power Filter, SAPF) control method for voltage source nonlinear load harmonic compensation, which belongs to the technical field of electric power electronics. Background technique [0002] As an advanced harmonic control device, Active Power Filter (APF) can effectively suppress nonlinear load harmonics. However, related studies in recent years have found that there is an interaction between the APF and the harmonic source. In order to obtain an ideal harmonic compensation effect, the series APF is only suitable for compensating the nonlinear load of the voltage source type, while the parallel APF (Shunt APF, SAPF) is suitable for compensating current source nonlinear loads. When the SAPF is used to compensate the voltage source type nonlinear load, it will increase the voltage ripple on the DC side of the rectifier and the current peak value on the AC side. [0003] In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 许胜
Owner 泰州学院
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