Direct Power Control of Three-Phase Electric Springs

Three-phase electric spring (TPES) was originally proposed to solve three-phase imbalance issues in power systems. So far, several attempts have been reported on proposing power control methods for it. However, existing solutions on TPES either depend on circuit parameters or have relatively slow dynamic responses. In this article, a novel power control strategy that incorporates the advantages of direct power control (DPC) is proposed to solve the above issues. It might be the first attempt to propose a simple power control strategy with rapid dynamic response and independent with circuit parameters for TPES. Besides, the relationship between power operating range and circuit parameters is well analyzed, which provides a way for parameter optimization. To restrain the resonance phenomenon caused by the TPES topology, the passive and active damping methods are compared, revealing that power quality of the control objective can be greatly improved with the active damping. Finally, the proposed DPC with both damping methods is validated by simulations and experimental results.