【摘要】 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CIGRE First Benchmark模型为例,在PSCAD/EMTDC仿真平台上定量分析了谐波源幅值、谐波源初相位对谐波阻抗扫描的影响,以验证所提出的方法可用于进一步提高HVDC谐波阻抗扫描结果的可靠性,为实际直流输电工程设计提供参考。更多还原

【Abstract】 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.更多还原