Natural coordinate orientation based active power filter control method

Abstract

The invention discloses a natural coordinate orientation based active power filter control method, which comprises the following steps: collecting in the real time the power grid side three-phase voltage, the DC bus voltage, the three-phase grid-connected current, the active power filter side three-phase current and the three-phase non-linear load current; calculating respectively the three-phase voltage peak, the active unit components, the power grid side commanded current, and the harmonic compensation commanded current; and accessing the three-phase SPWM modulation signal to drive the active power filter to work and therefore, to achieve the goal of treating harmonic pollution in the power grid. The method of the invention uses the power grid side voltage signal for natural coordinate orientation without the need of coordinate transformation and the traditional phase-lock loop. In addition, in contrast to a traditional harmonic detection method, the method of the invention does not need a low-pass filter, avoiding the influence of system delay. With reduced algorithm complexity, the harmonic compensation of the active power filter to the non-linear load grid-connected current can be achieved, which effectively solves the harmonic pollution problem of the non-linear load to the power grid and provides technical support for its large-scale application.

Description

technical field [0001] The invention belongs to the field of power quality regulation, and in particular relates to an active power filter control method based on natural coordinate orientation. Background technique [0002] In order to alleviate the pressure of energy demand and environmental protection, new energy distributed power generation technology has attracted the attention of people from all walks of life. With the continuous development and application of power electronic devices, the pollution of power grids is becoming more and more serious due to the harmonics generated by them. With its flexible controllability, Active Power Filter (APF) has gradually become one of the most effective ways to solve the problem of harmonic pollution by injecting current into the grid and compensating the harmonic current and reactive power generated by the load. one. [0003] Traditional control methods for active power filters are mostly based on harmonic current detection, a...

AI Technical Summary

Problems solved by technology

[0004] This application provides an active power filter control method based on natural coordinate orientation, which solves the phase delay introduced by using a low-pass filter to detect harmonic current in the traditional active power filter control method, as well as the complex control algorithm and comparison The problem of multiple hardware resources ensures that the active power filter can effectively compensate the harmonic current, simplify the control algorithm, improve the reliability of the system operation, and provide technical support for its large-scale promotion

Images