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提出一种新的电子电力变压器(EPT)无互联线并联控制策略。所提出的控制策略基于功率下垂控制理论,由有功功率均分控制回路和无功功率均分控制回路2部分组成。为了抑制输出电压的相位偏差,在控制回路中增加了输出电压相位同步控制回路;为使系统在线性和非线性负载条件下都能获得好的功率均分性能,在控制回路中增加了谐波电流控制回路;为改善系统的动态响应特性,增加了微分控制环节;为分析系统的稳定性和动态性能,方便控制参数的设计,建立了系统的小信号模型。仿真结果表明,所提出的控制策略获得了好的功率均分性能和电压调制特性,具有良好的动态响应特性,且在非线性负载条件下也获得了较好的均流特性。
A new interconnection control strategy without interconnecting lines for electronic power transformer (EPT) is proposed. The proposed control strategy is based on the power sag control theory and consists of two parts: the active power equalization control loop and the reactive power equalization control loop. In order to suppress the phase deviation of the output voltage, an output voltage phase synchronization control loop is added in the control loop. In order to obtain good power sharing performance under both linear and non-linear load conditions, harmonics are added to the control loop Current control loop. In order to improve the dynamic response of the system, differential control is added. In order to analyze the stability and dynamic performance of the system and to facilitate the design of the control parameters, a small signal model of the system is established. The simulation results show that the proposed control strategy has good power sharing and voltage modulation characteristics, good dynamic response and good current sharing under non-linear load.