关于传统的三项并网逆变器技术谐波大、电力系统中电能的质量不稳定等原因,根据单周期控制规律对新型铁路电力光伏三相并网逆变器进行了探究。描述了单周期控制的基本规律,探析了单周期控制下的三相逆变器运行原理,推论了三相逆变器的数学模型和相同效用控制方程,创建了应用于新型铁路电力光伏三相并网逆变器和控制体系。 With regard to the traditional three-grid inverter technology with large harmonics and instability of the quality of the power in the power system, the new three-phase grid-connected inverter for railway power photovoltaic was studied according to the single-cycle control law. The basic principle of single-cycle control is described, the operation principle of three-phase inverter under single-cycle control is analyzed, the mathematical model of the three-phase inverter and the same governing equation of utility are deduced, and the new three- Grid inverter and control system.