【摘要】 PD调制策略作为多载波调制策略中应用最广泛的一种,应用于级联H桥(CHB)逆变器时存在级联单元输出功率不均的问题。针对这一问题,通过分析载波周期输出、垂直互换与级联单元功率平衡角,提出了基于载波重组的级联逆变器功率均衡策略。以四单元CHB逆变器为例,可在任意功率因数下减弱半输出周期功率不均衡程度,并在两个输出周期达到功率均衡。此外对功率均衡方案进行了优化,减少了一半的载波数量并降低了调制难度。最后通过仿真与实验对理论分析及功率均衡方案的可行性进行验证。更多还原

【Abstract】 As one of the most widely used multi-carrier modulation strategies,PD modulation strategy has the problem of output power imbalance of cascaded cells when it is applied to cascade H-bridge(CHB) inverters.To solve this problem,a cascaded inverter power balancing strategy based on carrier reorganization is proposed by analyzing the carrier cycle output,vertical swap and cascaded unit power balancing angle.Taking the four-unit CHB inverter as an example,it can reduce the power imbalance in half output cycle at any power factor and achieve power balance in two output cycles.In addition,the power equalization scheme is optimized to reduce the number of carriers by half and the modulation difficulty.Finally,the feasibility of the theoretical analysis and power balance scheme is verified by simulation and experiment.更多还原