【摘要】 模块化多电平换流器（modular multilevel converter,MMC）正常运行的必要条件是直流侧维持稳定的工作状态，而对桥臂模块进行电压均衡控制是其控制的重要环节之一。针对传统均压策略在演算速度和开关损耗方面的劣势，提出一种基于极值索引排序算法的优化均压策略。根据子模块充放电过程的电压变化规律，在基于极值索引排序的基础上进行了重排序优化，实现了开关次数的降低。利用Matlab/Simulink仿真软件对二十一电平的MMC进行建模，通过对冒泡、混合、极值索引、优化极值索引四种排序算法进行仿真验证，体现了优化极值索引算法的明显优势，具体表现在具有较低的开关动作次数和优秀的演算速度。利用Visual C++6.0平台开发了C++算法程序，进行了模拟数据运算，已应用于MMC无功发生器控制中。更多还原

【Abstract】 The necessary condition for normal operation of modular multilevel converter(MMC)is to maintain stable operation condition at DC side,and the voltage equalization control of the bridge arm module is one of the important links of its control. In view of the disadvantages of traditional voltage equalization strategy in the aspects of calculation speed and switching loss,a kind of optimized voltage equalization strategy based on extreme index sorting algorithm is proposed. According to the voltage variation of the charge and discharge process of the sub-model,the reordering optimization is carried out on the basis of the extreme value index ordering and the number of switching operation is reduced. The Matlab/Simulink simulation software is used to model the MMC of 21-level. The obvious advantage of the extreme value index algorithm is reflected by way of simulating and verifying such four sorting algorithms as bubbling,mixing,extreme value index and optimized extreme value index,which reflects specifically in the low switching operation number and excellent speed of calculation. The C++ algorithm program is developed by using the Visual C++ 6.0 platform,and the simulation data operation is carried out,which has been applied to the control of the MMC reactive power generator.更多还原