Inverter reactive compensation and harmonic suppression method and device based on TTA and FFT fusion algorithm and medium

Abstract

The invention provides an inverter reactive compensation and harmonic suppression method and device based on a TTA and FFT fusion algorithm and a medium, and belongs to the technical field of inverters. The method comprises the following steps: acquiring voltage and current data of an alternating current side of an inverter, and transmitting the voltage and current data to an FPGA (Field Programmable Gate Array); calculating the total harmonic current and reactive current of the power grid end by using a TTA harmonic detection algorithm; calculating each harmonic current component in the current by using an FFT (Fast Fourier Transform) algorithm in an FPGA (Field Programmable Gate Array); pI operation is carried out by using the complex value of each harmonic, and amplitude phase angle related parameters of each harmonic are calculated; calculating the instantaneous value of each harmonic current in the current execution period according to the PI operation result of each harmonic; calculating to obtain a harmonic reactive power treatment instruction current; and adding the harmonic reactive power treatment instruction current and a current given value originally input by an inverter current loop to obtain a new current given value, and inputting the new current given value into the current loop to carry out harmonic reactive power treatment. According to the invention, the real-time performance and accuracy of the treatment effect are ensured, and the occupation of operation resources by a detection algorithm is reduced.

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