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发明公开
CN108599227A 基于MMC级联构成直流换流站的MMC直流电压平衡控制方法 有权

基于MMC级联构成直流换流站的MMC直流电压平衡控制方法
摘要：
本发明公开了一种基于MMC级联构成直流换流站的MMC直流电压平衡控制方法，包括：(1)根据系统的额定电压估算出所需的MMC单元串联个数N；(2)确定每个串联MMC单元的额定直流电压；(3)根据N的具体数值，选择出额定容量最小的MMC单元或者额定容量最大的MMC单元；(4)确定各串联MMC单元所采用的控制策略。本发明填补了目前串联MMC单元直流电压平衡策略方面研究的空白，能为未来工程设计提供一定的参考，通用性强，理论上不但适用于各串联MMC单元额定直流电压相同的情况，也适用于各串联MMC单元额定直流电压不同的情况。
摘要（英）：

The invention discloses an MMC direct current voltage balance control method capable of forming a direct current converter station based on a cascaded MMC. The method comprises the steps of 1, estimating the required number N of MMC units connected in series according to the rated voltage of the system; 2, determining the rated direct current voltage of each MMC unit connected in series; 3, selecting the MMC unit with the minimum rate capacity or the MMC unit with the maximum rate capacity according to the specific value of N; and 4, determining a control strategy used by each MMC unit connected in series. According to the method provided by the invention, the blank of research in current serially connected MMC unit direct current voltage balance strategies is filled, the certain referencecan be provided for future engineering design, the universality is strong, and the method is theoretically applicable to the situation that the rate direct current voltage of each MMC unit connectedin series is the same, and is also applicable to the situation that the rate direct current voltage of each MMC unit connected in series is different from one another.

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