This paper proposes a simple current control method without a grid voltage sensor for a rectifier of traction solid-state transformer. The proposed control scheme estimates the phase angle of grid voltage from the fundamental frequency current of the grid. The extracted phase signal is normalized to generate a sinusoidal current reference by adopting a scaling factor to achieve a unity gain. Since the proposed control method operates without the grid voltage sensor for power factor correction (PFC), it offers a cost-effective solution with a simple implementation structure. However, this method cannot guarantee its control performance under weak grid conditions, where the frequency of grid voltage often varies. Thus, the control parameters of the proposed method are discussed and analyzed to minimize performance degradation. To verify the feasibility of the proposed control method, simulations and experiments are carried out on a 2 kW single-phase PFC converter. The proposed method provides as much control performance as the conventional method, which uses the grid voltage sensor.

针对牵引式固态变压器的整流器，提出了一种不带电网电压传感器的简单电流控制方法。所提出的控制方案从电网的基频电流估计电网电压的相角。通过采用缩放因子以实现单位增益，将提取的相位信号归一化以生成正弦电流参考。由于所提出的控制方法在没有用于功率因数校正（PFC）的电网电压传感器的情况下运行，因此它以简单的实现结构提供了一种经济高效的解决方案。但是，这种方法不能保证在电网电压频率经常变化的弱电网条件下的控制性能。因此，讨论并分析了所提出方法的控制参数，以最大程度地降低性能下降。为了验证所提出的控制方法的可行性，在2 kW单相PFC转换器上进行了仿真和实验。所提出的方法提供与使用电网电压传感器的常规方法一样多的控制性能。