基于两步预测的光伏并网SL-qZSI的模型预测控制  

MODEL PREDICTIVE CONTROL OF PHOTOVOLTAIC GRID-CONNECTED SL-qZSI BASED ON TWO-STEP PREDICTION

作　　者：赵峰[1] 王卓 高锋阳[1] Zhao Feng;Wang Zhuo;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：《太阳能学报》2021年第7期118-124,共7页Acta Energiae Solaris Sinica

基　　金：国家重点研发计划(2018YFB1201602-06)。

摘　　要：为了受控变量追踪指令值更加准确,避免调制带来的开关损耗增大等问题,针对三相光伏并网开关电感型准Z源逆变器,提出一种基于两步预测的多变量模型预测控制。该控制策略通过两步预测代替一步预测,对并网电流、电容电压和电感电流进行多变量预测控制,可消除延迟时间,从而减小受控变量的振荡。最后通过Matlab/Simulink仿真,验证该控制策略在光照波动时并网运行过程中具有良好的控制性能和可行性。仿真结果也证明了相比一步预测,该控制策略所采用的两步预测减小了并网电流、电容电压和电感电流的振荡,使得它们跟踪各自指令值更加准确,还有减小总谐波畸变率的优点。In order to make controlled variables tracking reference values more accurate,and avoid increased switching loss due to modulation,a multi-variable model predictive control strategy based on two-step prediction is proposed for three-phase photovoltaic gridconnected switched-inductor quasi-Z source inverter.The control strategy replaces one-step prediction with two-step prediction to achieve multivariable predictive control of grid-connected current,capacitor voltage,and inductor current,eliminating delay time and thus reducing the oscillation of controlled variables.At the end of this paper,the control strategy is verified by Matlab/Simulink in which good performance and feasibility are proved in the process of light change.The simulation result also shows that it reduces the oscillation of the controlled variables and the total harmonic distortion compared with one-step prediction.

关 键 词：模型预测控制 电力逆变器 最大功率点追踪 光伏并网 开关电感型准Z源逆变器 

分 类 号：TM464[电气工程—电器]