Control of modular multilevel converter of full bridge or hybrid arm type in event of DC line disturbances

A method (100) of controlling a modular multilevel converter (MMC) of the full bridge or hybrid arm type in the event of DC line disturbances is provided. The method comprises determining (102, 104) whether a magnitude of a DC voltage (Udp) of the MMC has dropped below an upper voltage threshold (Udmaxlim), and if it is determined that the magnitude of the DC voltage has dropped below the upper voltage threshold, lowering (106) a magnitude of an AC active current reference (IVDOD) and a magnitude of a DC voltage reference (UDCREF) for the MMC based on the DC pole voltage. An MMC having a controller implementing the method, a converter station comprising at least one such MMC, and a power transmission system comprising at least one such converter station are also provided. 提供了一种在DC线路扰动的情况下控制全桥或混合臂类型的模块化多电平转换器MMC的方法(100)。该方法包括确定(102，104)MMC的DC电压(Udp)的幅值是否已经下降到低于上电压阈值(Ud_max_lim)，并且如果确定DC电压的幅值已经下降到低于上电压阈值，则基于DC极电压降低(106)用于MMC的AC有功电流基准(IVD_ORD)的幅值和DC电压基准(UDC_REF)的幅值。还提供了一种具有实施该方法的控制器的MMC、一种包括至少一个该MMC的换流站、以及一种包括至少