摘要
基于模块化多电平换流器(modular multilevel converter,MMC)的电力电子变压器(power electronic transformer,PET)在非理想工况下易发生故障及扰动,严重影响系统电能质量。针对传统控制方法在非理想工况下存在的动稳态性能差等问题,在MMC-PET整流级提出了基于自适应自抗扰比例积分控制器的连续控制集模型预测控制策略。首先,设计了自适应自抗扰比例积分控制器用于电压外环,解决了电压外环信号跟踪及扰动抑制能力差等问题。其次,电流内环使用连续控制集模型预测控制方法以提高系统的响应速度及稳态性能,引入改进型载波移相调制策略解决桥臂电流畸变问题。最后,在网侧负载突变、网压不平衡、输出级负载投入等非理想工况下对MMC-PET系统进行对比仿真和实验,验证了所提控制策略的优越性。
The power electronic transformer(PET)based on modular multilevel converter(MMC)is prone to failures and disturbances under non-ideal operating conditions,which seriously affects the system power quality.Aiming at the poor dynamic and steady state performance of traditional control methods under non-ideal operating conditions,a continuous control set model predic⁃tive control strategy based on self-adaptive auto-disturbance rejection proportional integral controller is proposed in the MMC-PET rectifier stage.Firstly,a self-adaptive auto-disturbance rejection proportional integral controller is designed to solve the problems of poor signal tracking and disturbance rejection in the voltage outer loop.Secondly,the continuous control set model predictive control method is used in the current inner loop to improve the response speed and steady state performance of the system,and an improved carrier phase-shift modulation strategy is introduced to solve the problem of bridge arm current distortion.Finally,the MMC-PET system is compared by simulation and experiment under non-ideal operating conditions,such as sudden change of loads on the grid side,unbalanced grid voltage,and load input at the output stage,to verify the superiority of the proposed control strategy.
作者
杨浩
周建萍
黄烈钢
周靖涛
YANG Hao;ZHOU Jianping;HUANG Liegang;ZHOU Jingtao(Shanghai Key Laboratory of Power Station Automation Technology,College of Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《南方电网技术》
CSCD
北大核心
2024年第9期11-22,共12页
Southern Power System Technology
基金
国家自然科学基金资助项目(61905139)。
关键词
电力电子变压器
模块化多电平换流器
自适应自抗扰比例积分控制
连续控制集模型预测控制
双闭环控制
power electronic transformer
modular multilevel converter
self-adaptive auto-disturbance rejection proportional integral control
predictive control of continuous control set model
dual closed loop control
