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中文摘要：
详细讨论了适用于风电并网的模块化多电平柔性直流输电系统启动控制策略。启动控制的核心在于子模块电容充电,可分为不控整流和高频整流两个阶段。针对不控整流阶段,基于其数学模型给出了限流电阻选型依据以抑制风电场侧换流器在启动及控制系统解锁瞬间的冲击电流。针对高频整流阶段,提出了基于直流电压斜率控制的充电策略以避免系统侧换流器输出过流。所设计的两个换流器启动顺序控制流程在仿真平台得到了验证。
英文摘要：
An algorithm for the start-up control of modular multilevel voltage source converter based high voltage direct current （VSC-HVDC） for wind farm integration is proposed. Charging the submodule capacitor is the core of start-up control, which can be divided into two stages. For the first uncontrollahle diode-rectified stage, the equivalent mathematical model of modular multilevel converter （MMC） is developed to provide theoretical basis for the selection of the value of current limiting resistor. For the second high-frequency rectified stage, a selection range for the slope parameter of DC voltage control loop is proposed to suppress the over currents of grid side MMC. The simulation results have verified the effectiveness of the proposed start-up control strategies.
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