基于复合控制的电力电子变压器控制策略研究  

Research on control strategy of power electronic transformers based on composite control

作　　者：周保柱 赵峰[1] 高锋阳[1] Zhou Baozhu;Zhao Feng;Gao Fengyang(School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070

出　　处：《电测与仪表》2019年第9期21-26,共6页Electrical Measurement & Instrumentation

基　　金：国家重点研发计划资助项目(2018YFB1201602-06)

摘　　要：在电力电子变压器(PET)中,针对高频变压器连接的输入级与输出级的变换器,现有的控制策略太过复杂,文中提出了一种复合控制应用在整个系统中。复合控制器由前馈解耦控制和智能预测控制两部分组成,前馈控制将系统中的交叉耦合电势进行完全解耦,然后智能预测控制通过离散模型来预测电路变量,确保交流输出的电流参考值最接近前馈项的估计值。并且在下一个采样周期,选择最合适的开关状态来驱动功率器件。对系统输入和输出之间的不同电压幅值以及负载功率的变化进行仿真实验,仿真结果表明能够改善系统的稳态性能以及抗干扰能力,并得到单位功率因数运行,研究表明了所提出方法的正确性和有效性。In power electronic transformers (PET), for the converters of the input and output stages of the high-frequency transformer connection, the existing control strategy is too complicated, and therefore, a composite control is proposed in this paper and applied in the whole system. The compound controller consists of two parts including feed-forward decoupling control and intelligent predictive control. The feed-forward control is fully decoupled based on the cross-coupling potential in the system, and then, the discrete model passed by the intelligent predictive control predicts the circuit variables, ensuring that the current reference of the AC output is closest to the estimate of the feed-forward term. And in the next sampling cycle, the most suitable switching state is chose to drive the power device. The simulation experiment is carried out on the different voltage amplitudes and load power changes between the input and output of the system. The simulation results show that the system can improve the steady-state performance and anti-interference ability, and obtain the unit power factor operation. The research shows that the correctness and effectiveness of the proposed method.

关 键 词：电力电子变压器 前馈控制 智能预测控制 稳定性 

分 类 号：TM74[电气工程—电力系统及自动化]