Research on a Hybrid Control Method for Three-Phase High-Power Energy Storage Converter

The repetitive control technique is adopted to a bidirectional AC-DC system for storing electrical energy, which also can be used to enhance the performance of bidirectional power flow between the three-phase ac voltage source and energy storage equipment in this paper. In order to eliminate the influences of line harmonics and frequency disturbances, a closed-loop phase-locked loop (PLL) without any hardware filters is completely applied to software. Constant current (CC) and constant voltage (CV) charging, constant power (CP) discharging are realized by dq separated control method. For the sake of eliminating periodic interference and tracing the periodic disturbance signal, the compound control (PI-RC) of PI (proportion integration) controller plus repetitive control is designed. The realization of controller and algorithm is realized by single-core digital processor (DSP). The simulation and experiment results based on a 100 kW prototype topology demonstrate that the prototype has high performance of low total harmonic distortion (THD) current.