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中文摘要：
电网电压不平衡时，引起电压源换流器输出功率的二倍频波动。为此，研究了两相静止筇坐标系下的电压源换流器高压直流输电（vsc—HVDC）电网电压三相不平衡时的功率优化控制策略。为了方便计算不同控制目标下的参考电流，引入两个独立可调的参数，推导参考电流的统一解析表达式。提出采用粒子群算法对两个独立参数进行优化，同时抑制有功功率和无功功率二倍频波动，实现多目标控制。并采用比例谐振控制器进行矢量电流控制，实现交流信号无静差控制。在PSCAD／EMTDC中进行仿真验证，结果表明，当发生单相接地故障时，采用文中提出的功率优化策略，当有功功率波动不超过10％时，无功功率的波动减弱20％，仿真结果和理论分析相一致，验证了所提出的优化控制策略的有效性和可行性。
英文摘要：
Unbalanced grid voltage will lead to double frequency fluctuation power in voltage source converter. We put forward an optimization control strategy for power control of VSC-HVDC under unbalanced grid voltage conditions in the stationary aft reference frame. For simple implementation and flexible operation, introducing two individually adapta- ble parameters, the current references are derived and synthesized into one generalized equation aiming to manipulate different control objectives. A parameter optimization method based on particle optimal swarm（PSO） algorithm is pre- sented to determine the two parameters, which can restrain the double frequency reactive and active power oscillations at the same time. It is preferred to choose a PR controller which can achieve zero steady state error in ctl3 stationary coordi- nate. The proposed strategies have been investigated by PSCAD/EMTDC. The simulation results demonstrate that the reactive power oscillation reduces by 20% while the active power fluctuation is limited to less than 10% when single phase fault occurs. The expected performance of theoretical analysis validates the effectiveness and feasibility of the pro- posed method.
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