基于测试信号法的HVDC谐波阻抗扫描方法研究

谐波阻抗扫描是高压直流输电(HVDC)中谐波谐振分析、交流或直流滤波器设计等工作的重要手段.采用电路叠加定理说明了适用于HVDC谐波阻抗扫描的测试信号法.基于测试信号法基本原理及其在HVDC应用研究中的进展,提出测试信号法应用于HVDC谐波阻抗扫描的谐波源幅值选择方法和用于减小谐波源初相位影响的改进扫描方法.最后,以C...

high voltage direct current; harmonic impedance scanning; test signal method; amplitude of harmonic source; initial phase of harmonic source

Harmonic impedance scanning is an important means of harmonic resonance analysis and AC or DC filter design in HVDC. In this paper, the circuit superposition theorem is used to explain the test signal method which is suitable for HVDC harmonic impedance scanning. Based on the basic principle of the test signal method and how it has progressed in HVDC application research, a method of selecting harmonic source amplitude and an improved scanning method for reducing the influence of the initial phase of the harmonic source are proposed. Finally, taking the CIGRE first benchmark model as an example, the influence of harmonic source amplitude and initial phase on harmonic impedance scanning is quantitatively and qualitatively analyzed on a PSCAD/EMTDC simulation platform to verify that the proposed method can be used to further improve the reliability of harmonic impedance scanning results of HVDC, and provide a reference for actual HVDC project design.This work is supported by the Science and Technology Project of China Southern Power Grid (No. CGYKJXM20180485) and Sichuan Science and Technology Plan (No. 2019YJ0631).