Single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current

Abstract

The invention discloses a single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current. The single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current is characterized by comprising the following steps that 1, network voltage us<t> and current information is<t> are extracted; 2, is<t> cos wt is passed through a first low-pass filter to obtain a first direct-current component; is<t> sin wt is passed through a second low-pass filter to obtain a second direct-current component; 3, the first direct-current component is feedback-decoupled with is<t> cos wt, and the first direct-current component is cross- decoupled with is<t> sin wt; the second direct-current component is feedback-decoupled with is<t> sin wt, and the first direct-current component is cross-decoupled with is<t> cos wt; 4, the first direct-current component after the cross-feedback decoupling is performed is convolved with cos wt to obtain ip<t>=Ip cos wt; the first direct-current component after the cross-feedback decoupling is performed is convolved with sin wt to obtain iq<t>=Iq sin wt; 5, ip<t> and iq<t> are magnified 2 times through a gain loop to obtain the magnitude of fundamental active current and the magnitude of reactive component current.

Description

technical field [0001] The invention belongs to the technical field of smart grids, and in particular relates to a single-phase high-precision fast cross-feedback decoupling harmonic and reactive current extraction method. Background technique [0002] With the rapid development of power electronics technology, a large number of harmonic currents brought by nonlinear devices such as rectifiers and inverters appear in the power grid. These harmonic currents greatly reduce the power quality of the power grid and bring various hazards to the power grid and power users, such as reducing the operating efficiency of the power grid and affecting the normal operation of electrical equipment such as transformers. In addition, in the new energy micro-grid that has been vigorously promoted in recent years, due to the large number of power electronic devices in the micro-grid and the volatility of distributed energy, the power quality problem of the micro-grid is more prominent. As a n...

AI Technical Summary

Problems solved by technology

According to the principle of algorithm detection, harmonic and reactive power detection algorithms are mainly divided into harmonic detection algorithms based on instantaneous power and harmonic detection algorithms based on Fourier transform. The former has good dynamic characteristics, while the latter has higher precision, but there is a cycle delay

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