UPS无互联线并联中基于解耦控制的下垂特性控制方案

在UPS无互联线并联中，传统下垂特性控制是一种有效的控制方案，但是它在动态调节过程中容易引起正反馈效应。该文通过对传统下垂特性局限性的仔细分析，提出了一种基于解耦控制的新下垂特性控制方案。此控制方案可以克服传统下垂特性的弱点，也不会影响稳态时的功率均分，同时还具有对参数变化较强的抗干扰能力。仿真与实验结果都证实了该方案不仅可以获得很好的动态调节特性，而且可以提高并机系统的稳定性。

THE DROOP CHARACTERISTIC CONTROL SCHEME BASING ON DECOUPLING CONTROL IN THE PARALLEL OPERATION OF UPS WITH NO CONTROL INTERCONNECTION

The traditional droop characteristic is an effective control scheme in the parallel operation of UPS with no control interconnection. However, the traditional droop characteristic may introduce positive feedback in the process of dynamic regulating. After detail analysis of the defect of traditional droop characteristic, we present a new droop characteristic basing on decoupling control. This new control scheme can overcome the defect of traditional droop characteristic, not affecting the powers sharing in static state. And at the same time, the new control scheme has strong ability of rejecting interface of parameters changing. The simulation and experimental results show that the proposed control scheme not only can achieve good dynamic performance but also can improve system stability.