为分析谐波对电网换相型换流器高压直流输电系统(line commutated converter based high voltage direct current,LCC-HVDC)稳定性的影响,亟需建立一个考虑谐波耦合效应的LCC-HVDC精确模型.基于谐波状态空间(harmonic state space,HSS)理论,考虑频率耦合效应和控制系统建立了12脉动LCC的阻抗模型,所建交直流谐波阻抗模型能在更宽的频带与扫频结果吻合.最后通过PSCAD电磁暂态仿真结果与HSS阻抗模型计算结果对比,验证了所提出的LCC-HSS阻抗模型的正确性.LCC-HSS阻抗建模方法提高了对LCC换流站进行数学建模的精确性,且可以适应多种模式下LCC换流站阻抗建模,为LCC系统稳定性分析及参数优化提供了较为精确的模型.
Impedance Modeling of 12-Pulse Converter Station Based on Harmonic State Space Theory
In order to analyze the influence of harmonics on the stability of line commutated converter based high voltage direct current(LCC-HVDC)system.It is urgent to establish an accurate model of LCC-HVDC considering harmonic coupling.Based on the theory of harmonic state space(HSS),an impedance model of 12-pulse LCC is established considering frequency coupling effect and control system.The constructed AC/DC harmonic impedance model can match the sweep frequency results in a wider frequency band.Finally,the correctness of the proposed LCC-HSS impedance model is verified by comparing the PSCAD electromagnetic transient simulation results with the HSS impedance model calculation results.The LCC-HSS impedance modeling method improves the accuracy of mathematical modeling for LCC converter stations and can adapt to impedance modeling of LCC converter stations in various modes,providing a more accurate model for stability analysis and parameter optimization of LCC systems.
harmonic state spaceHVDC transmissionsmall signal modelharmonic impedance
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