矢量电流控制的电压源换流器式高压直流输电系统动态特性分析
Dynamic Performance Analysis of Vector Current Controllers for VSC-HVDC
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摘要: 通常在交流系统故障时,公共耦合点电压不仅幅值会发生变化,同时还伴随着相角跳变。基于电磁暂态仿真软件PSCAD/EMTDC,建立了电压源换流器式高压直流输电(voltage source converter-high voltage direct current transmission,VSC-HVDC)模型及电流矢量控制器(vector current controller,VCC)、双矢量电流控制器(dual vector current controller,DVCC)模型,分别就对称三相短路故障、不对称两相短路故障及不同相位跳变角情况进行仿真分析。研究了系统故障条件下,对VSC-HVDC分别采用VCC、DVCC时的系统动态特性。结果表明,DVCC能更好地抑制直流电压的2倍频振荡,但其动态特性比VCC差,且对相角跳变更敏感,可能会弱化VSC-HVDC应有的技术优势。Abstract: When the AC system is faulted,the voltage magnitude is varied at point-of-common coupling （PCC）,normally accompanied with phase angle jump. Voltage source converter-high voltage direct current transmission （VSC-HVDC） systems with vector current controller （VCC） and dual vector current controller （DVCC） were presented and analyzed under balanced and unbalanced fault considering phase angle jump in PSCAD/EMTDC. The dynamic performance of VSC-HVDC with VCC and DVCC was investigated. The results show that DVCC can restraint 100 Hz oscillation with certain condition,but its dynamic performance is inferior to VCC and susceptible to phase angle jump,weakening the VSC-HVDC original superiority.
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