Three-phase four-wire system APF improved vector resonance control method

Abstract

The invention relates to a three-phase four-wire system APF improved vector resonance control method. The method comprises the following steps of (1) performing real-time sampling on a direct-currentbus voltage, and controlling the direct-current bus voltage to be kept constant to obtain a power grid side current reference instruction; (2) performing real-time sampling on a power grid side current, establishing an improved resonant vector current controller, inputting the power grid side current control instruction and the power grid side current actually measured value to the improved resonant vector current controller to obtain a three-phase four-wire system APF modulation signal; (3) performing modulation on the modulation signal to obtain a switching signal of each switching tube of the three-phase four-wire system APF, and according to the switching signal, controlling the switching tube to work. Compared with the prior art, the dynamic response speed is fast, the stability margin is high, the calculation amount is small, and the anti-jamming capability is strong.

Description

technical field [0001] The invention relates to a three-phase four-wire system APF control method, in particular to a three-phase four-wire system APF improved vector resonance control method. Background technique [0002] With the rapid development of power electronic technology, more and more power electronic devices are widely used in various fields. Non-linear loads such as rectifiers, frequency conversion speed control devices, and electric arc furnaces in the power grid continue to increase. And unbalance has caused severe transient impact, reactive power, higher harmonics and three-phase unbalance to the power grid. Thyristors, diodes and other switching devices in power conversion technology are widely used in the power grid to generate harmonic currents and reactive currents, replacing the harmonic and sub-harmonic currents caused by traditional ferromagnetic materials. The main source of harmonic pollution, causing voltage and current distortion and other phenomen...

AI Technical Summary

Problems solved by technology

This controller provides good selectivity to the frequency response of the entire control loop of the resonant bandpass filter, but cannot guarantee good dynamic response characteristics due to the delay of harmonic detection

[0007] (3) A control strategy with multiple synchronous rotating coordinate systems: the positive and negative sequence harmonic currents are transformed to obtain DC components through their respective synchronous rotating coordinates, and then the PI controller is used to realize zero steady-state error compensation, but complex calculations will take up a lot of time memory space

However, this type of method cannot solve the three-phase unbalance and reactive power problems

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