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中文摘要：
基于电压源型换流器（voltage source converter，VSC）的高压直流输电工程在运行工况变化时，换流电抗器电感参数将随之变化，双闭环解耦控制器中含有电感参数的电流内环解耦将不准确或失效。为此，提出了一种dq同步旋转坐标系下无电感参数的解耦控制器。针对VSC．HVDC交流系统5、7、11、13等低次谐波含量较大的问题，提出了一种PI与准PR级联的控制器。算例仿真结果表明所提解耦控制策略可实现有功和无功的独立快速调节，能够有效抑制交流谐波，提高VSC-HVDC并网的电能质量。
英文摘要：
When operating condition of voltage source converter （VSC） based HVDC power transmission system changes, the inductance parameter of inverter reactor changes correspondingly, it leads to decoupling of inner current-loop, which contains inductance parameter, in the dual closed-loop decoupling controller inaccurate or disabled. For this reason, a kind of decoupling controller without inductance parameter in d-q synchronous rotating coordinate is proposed. In allusion to the higher content of low orders of harmonics such as 5-, 7-, 11-and 13-order harmonics in AC systems connected to the inverter side of VSC-HVDC transmission system, a controller, in which the proportion integration （PI） control is cascade connected with quasi-proportional resonance （PR） control, is proposed. Simulation results of example show that using the proposed decoupling control strategy the active power and reactive power can be fast regulated independently, and the harmonics can be effectively suppressed and the power quality of grid-connected VSC-HVDC can be improved.
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