电子电力变压器并联运行的自适应下垂控制策略  

Adaptive Droop Control Strategy for Parallel Operation of Electronic Power Transformers

作　　者：付国宏 杨赟 王元超 杨明 王丹 FU Guohong;YANG Yun;WANG Yuanchao;YANG Ming;WANG Dan(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《电力系统及其自动化学报》2019年第1期77-83,共7页Proceedings of the CSU-EPSA

摘　　要：电子电力变压器(EPT)采用并联运行方式,可以提高电网供电的可靠性。在并联过程中下垂控制策略应用最为广泛。传统的下垂控制在线路阻抗不相等时会导致负荷分配不均并产生环流。为解决这一问题,提出了一种自适应下垂控制策略,将并联运行的EPT输出级功率的一次函数变成P、Q的二次函数,根据各自的额定容量求出对应的功率比例,调节实际输出功率,使EPT按额定容量成正比分配负荷,减小了线路阻抗不均造成的影响。在Matlab/Simulink中搭建仿真模型,并联系统动态性能良好,仿真结果验证了所提出控制策略的有效性和可行性。The parallel operation of electronic power transformers ( EPTs ) can improve the reliability of power supply from power grid , in which the droop control strategy is most widely used. When the line impedance is unequal , the tra-ditional droop control strategies will cause uneven load distribution and circulation. To solve this problem , an adaptive droop control strategy is proposed , under which the linear function of each output power from the EPT in the parallel op-eration process is transformed into a quadratic function with respect to P and Q;the corresponding power ratio is calcu-lated according to the rated capacity of each EPT , respectively;the actual output power of EPTs is adjusted to share load in proportion to the rated capacity , thus reducing the impact of uneven line impedance. A simulation model is built based on Matlab/Simulink. The parallel system has a satisfying dynamic performance , and simulation results verify the effectiveness and feasibility of the proposed control strategy.

关 键 词：电子电力变压器 自适应下垂控制 功率分配 环流抑制 

分 类 号：TM433[电气工程—电器]