Electric Spring Voltage Regulation Technology

With the development of new energy sources, new energy microgrid brings many advantages, but also causes power quality problems such as voltage fluctuations and harmonic pollution. The proposed electric spring (ES) can effectively alleviate the intermittent and unstable problems of new energy power generation, reduce the impact of voltage fluctuations on critical loads, and improve power quality. Firstly, the paper introduces the working principle and modeling of ES system. Then, based on the phase control algorithm, two control strategies, the traditional double-closed-loop control, quasi-proportional resonance control and grid voltage feed-forward compatible control, are analyzed and studied. Finally, the simulation model of the system is built, and the simulation results under the two control strategies are compared. The results show that the latter has better steady-state, dynamic and harmonic suppression performances.