四端输出三相-两相矩阵变换器间接控制策略

针对三相-两相矩阵变换器(3-2MC)拓扑无大容量储能元件,输出不对称影响输入电流质量的问题,提出一类引入脉动功率补偿单元的三端和四端输出3-2MC拓扑.首先,详细阐述上述所提两种变换器抑制输出脉动功率进而提高输入性能的原理、实现过程和适用范围,推导四端输出3-2MC的电压传输率与系统参数之间的关系式,并基于上述拓扑特点,提出输出扇区划分方式;然后,提出以输出侧与补偿侧三相电流加权量作为间接控制量的级联式控制策略,从理论上对其可行性进行分析,并给出系统控制参数的优化选取方法.仿真结果表明,基于间接控制策略的四端输出3-2MC拓扑可有效改善输出不对称情况下的输入电流性能,与传统的三端无补偿单元拓扑相比,该方法具有良好的动态性能和更大的输出适用范围.

Indirect control strategy of three-phase to two-phase matrix converter under four terminal output

For the three-phase to two-phase matrix converter (3-2MC) without large-capacity energy storage components, the output asymmetry affects the input current quality. To deal with this problem, we present a class of three-terminal and four-terminal output 3-2MC topologies with pulsating power compensation unit. Firstly, the principle, the realization process and the application range of the two kinds of converters to suppress the output pulsating power and improve the input performance are described in detail. The relationship between the voltage transmission rate and the system parameters of the four terminal output 3-2MC is deduced. Based on the characteristics of the topology, the output sector division method is proposed. Then, a cascade control strategy is proposed, taking the output side and the compensation side three-phase current weighting amount as the indirect control quantity, and the feasibility is analyzed theoretically. Furthermore, an optimization method of system control parameters is given. The simulation results show that the four-terminal output 3-2MC topology based on the indirect control strategy can effectively improve the input current performance under asymmetric output. Compared with the traditional three-terminal topology without pulsating power compensation unit, the proposed method has good dynamic performance and more large output range.