混合型MMC器件损耗分布优化控制方法  

Optimization Control Method for Loss Distribution of Devices in Hybrid MMC

作　　者：马新喜 路茂增 赵艳雷[1] 孙标 苏田田 MA Xinxi;LU Maozeng;ZHAO Yanlei;SUN Biao;SU Tiantian(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo,Shandong 255000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《南方电网技术》2023年第5期19-28,99,共11页Southern Power System Technology

基　　金：国家重点研发计划项目(2017YFB0902800);山东省自然科学基金青年项目(ZR2020QE215)。

摘　　要：全桥-半桥1:1混合型MMC在正常稳态下工作于半桥型MMC模式,全桥及半桥子模块充放电行为几乎一致,子模块器件损耗分布极不均衡,特别是在逆变工况下,半桥子模块下部IGBT损耗尤为突出。为此,提出了基于全、半桥两类子模块差异化控制的器件损耗分布优化方法。首先,解析计算子模块器件损耗,以明确损耗不平衡的原因。其次,为改善器件损耗分布,在不影响设备输出外特性前提下,提出全/半桥模组解耦控制方法。然后,通过分析模组平均开关函数对器件通态及开关损耗的影响机理,以降低半桥子模块下部IGBT损耗为目标,推导出最优模组平均开关函数。最后,通过MATLAB/Simulink及PLECS仿真验证解耦控制策略的可行性及其对损耗分布优化的有效性。Hybrid MMC consisting of full-bridge sub-modules(FBSMs)and half-bridge sub-modules(HBSMs)works as the HBSMs mode during normal operation.The charging behaviours of FBSMs and HBSMs are almost coincident.The loss distribution of submodules device is extremely uneven,eespecially the loss of IGBTs at the lower part of HBSMs is particularly prominent for MMC works as an inverter,which threatens the operation safety of the system.Thus,a loss distribution optimization method with the dif⁃ferential control of FBSMs and HBSMs is proposed.Firstly,the reason of loss imbalance is clarified by calculating the sub-module device loss.Secondly,to improve the device loss distribution,a full-bridge/half-bridge modules decoupling control method without affecting the external characteristics of the equipment output is proposed.Then,the influence mechanism of modules average switch⁃ing function on the device conduction and switching losses is analyzed.Aming to reduce the IGBT loss in the lower part of HBSM,the optimal modules average switching function is derived.Finally,the feasibility of decoupling control strategy and the effectiveness of loss distribution optimization are verified by MATLAB/Simulink and PLECS simulation.

关 键 词：模块化多电平换流器 全桥子模块 半桥子模块 损耗计算 损耗分布 解耦控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]