CAJ | 학술논문

从经济性和功率集成角度提出一种单电源级联型多电平逆变器。该拓扑在保留了传统级联型多电平逆变器中单管耐压低、所需器件少、易于模块化的优点上，其直流侧仅有一个独立电源，其它电源可用电容代替。通过引入充电开关管组，电源可为电容频繁地充电，使电容电压在一定程度上保持恒定。独立电源和电容有效组合使得多电平逆变器稳定运行。详细地介绍单电源级联型七电平逆变器的工作原理及采用的载波移相调制策略；通过数学推导得到电容电压稳定性的影响因素，结果用于电容参数设计；充电损耗也进行了计算；控制系统通过TMS320LF2407A DSP 和XC3S400FPGA 数字化实现。搭建一台1 kW 逆变器样机，验证了提出拓扑的可行性。
종경제성화공솔집성각도제출일충단전원급련형다전평역변기。해탁복재보류료전통급련형다전평역변기중단관내압저、소수기건소、역우모괴화적우점상，기직류측부유일개독립전원，기타전원가용전용대체。통과인입충전개관관조，전원가위전용빈번지충전，사전용전압재일정정도상보지항정。독립전원화전용유효조합사득다전평역변기은정운행。상세지개소단전원급련형칠전평역변기적공작원리급채용적재파이상조제책략；통과수학추도득도전용전압은정성적영향인소，결과용우전용삼수설계；충전손모야진행료계산；공제계통통과TMS320LF2407A DSP 화XC3S400FPGA 수자화실현。탑건일태1 kW 역변기양궤，험증료제출탁복적가행성。
From the view of economy and power integration, a novel single-supply cascaded multilevel inverter is proposed in this paper. Retaining the traditional cascaded multilevel inverter's merits of low voltage stress on each switch, few quantities of switches and easy modularization, it contains only one independent DC source in DC-link and DC source in other bridges are replaced by some capacitors. The independent DC source can charge the capacitors frequently by the introduction of the charging-switches pairs and keeps the voltage of the capacitors to be regarded as constant to some extent. The effective combination of the independent DC source and capacitors ensures that the cascaded multilevel inverter operates stably. The operation principle and carrier phase-shifted sinusoidal pulse width modulation (SPWM) strategy of the single-supply cascaded seven-level inverter are first presented in detail. The influencing factors of the capacitors voltage stability are deduced by mathematical analysis, and the result serves as theoretical basis of the parameter optimization. In addition, the charging-loss is calculated. Control system is digitally implemented with TMS320F2407A DSP and XC3S400 FPGA. A 1kW inverter prototype has been built to verify the feasibility of the proposed topology.