Abstract

With the development of High Voltage Direct Current (HVDC) and ultra HVDC, a growing number of high voltage film filter capacitors have been installed for harmonic suppression. But the capacitors generate severe audible noise in the converters, which has become more and more serious. Then it is important to imitate the practical working situation of capacitors for the research of noise characteristics to improve the capacitive performance in lab. In this paper, a FFT-based harmonic current control method is proposed for audible noise analysis of AC filter capacitor. Firstly, mathematical model of the Harmonic Current Injection System (HCIS) is built based on MATLAB. Then a Fast Fourier Transform (FFT) harmonics detection method is analyzed and used to detect the amplitude and phase of each harmonic considering a number of harmonic currents flowing through AC filter capacitors. Since the amplitude and phase spectrum of capacitor current are obtained, the Proportional Integral (PI) regulator is applied to adjust the specified harmonic amplitude to achieve zero-error control. Then accurate harmonic current can be injected to the tested capacitor and it will help to acquire the noise characteristics of the tested plant. At last, the simulation and experimental results validate the proposed strategy.

Highlights

  • With the increasing of energy demand and the development of new energy generation technology, High Voltage Direct Current (HVDC) transmission technology becomes to one of the development directions of power grid in the future in order to supplement the existing AC transmission system

  • Fast Fourier Transform (FFT)-based selective harmonic current control is proposed for research on audible noise characteristics of AC capacitors

  • The theoretical analysis about harmonic detection algorithm based on FFT is presented and analyzed

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Summary

Introduction

With the increasing of energy demand and the development of new energy generation technology, HVDC transmission technology becomes to one of the development directions of power grid in the future in order to supplement the existing AC transmission system. Keywords Harmonic detection, AC filter capacitors, current control, FFT algorithm In order to compensate reactive power and filter harmonics, the converter station needs a large number of AC filter capacitors which will generate audible noise.

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