适用于实时仿真的MMC子模块电容电压优化均衡方法  

Optimized capacitor voltage balancing method for real-time simulation of MMC sub-module

作　　者：樊强 王乐[1] 冯谟可 俞永杰 赵成勇[1] 许建中[1] FAN Qiang;WANG Le;FENG Moke;YU Yongjie;ZHAO Chengyong;XU Jianzhong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电力自动化设备》2020年第11期175-180,共6页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51607065)。

摘　　要：针对并行全比较算法存在的高空间复杂度问题,提出一种适用于模块化多电平换流器(MMC)实时仿真的电容电压均衡优化方法。在子模块电容电压的排序方面,采用分组排序的均压策略,组内子模块采用并行全比较算法以减少排序时间,组间子模块根据所定义的能量平衡因子计算结果来平衡其电容电压值。此外,提出一种子模块电容电压值重构方法处理含相同电容电压值的子模块排序问题。在触发脉冲产生方面,提出一种串、并行触发结合的混合触发模式,将触发脉冲产生环节消耗的时间与MMC各桥臂子模块总数解耦。在PSCAD/EMTDC仿真程序和低功率MMC物理样机平台的阀级控制器中验证了所提MMC子模块电容电压优化均衡方法的逻辑有效性和工程实用性,证明了所提方法在保证低时间复杂度的同时,其空间复杂度亦有所降低。Aiming at the high space complexity of the parallel full comparison algorithm,an optimized capacitor voltage balancing method for real-time simulation of MMC(Modular Multilevel Converter)sub-module is proposed.The balancing strategy of grouping sorting is implemented in the aspect of sorting strategy of sub-module capacitance voltage.Parallel full comparison algorithm is adopted to in-group sub-modules to reduce sorting time.According to the calculated result of the defined energy balance coefficient,the intergroup sub-modules are sorting to balance their capacitance voltage values.In addition,a reconstruction method of sub-module capacitor voltage value is proposed to deal with the sorting problem of sub-modules with the same capacitor voltage.A hybrid trigger mode combined by series and parallel triggering is proposed to decouple the time consumed by the trigger pulse generation and the number of bridge leg sub-modules of MMC in the aspect of trigger generation.The logic validity and engineering practicability of the optimized capacitor voltage balancing method for real-time simulation of MMC sub-module are verified in PSCAD/EMTDC simulation program and valve-level controller of the low power MMC physical prototype platform.It is proved that the proposed method not only guarantees the low time complexity,but also reduces the space complexity.

关 键 词：MMC 换流器 时空复杂度 并行全比较算法 能量平衡因子 物理样机 

分 类 号：TM46[电气工程—电器]