LC滤波型电压源逆变器无模型预测电压控制策略  

Model-Free Predictive Voltage Control Strategy for LC-Filtered Voltage Source Inverter

作　　者：尹政 胡存刚[1] 芮涛 冯壮壮 陆格野 Yin Zheng;Hu Cungang;Rui Tao;Feng Zhuangzhuang;Lu Geye(School of Electrical Engineering and Automation Anhui University,Hefei,230601 China;School of Internet Anhui University Hefei,230601,China;State Key Lab of Security Control and Simulation of Power Systems and Large Scale Generation Equipment Tsinghua University Beijing,100084,China)

机构地区：[1]安徽大学电气工程与自动化学院,合肥230601 [2]安徽大学互联网学院,合肥230601 [3]电力系统及大型发电设备安全控制和仿真国家重点实验室(清华大学),北京100084

出　　处：《电工技术学报》2023年第14期3723-3732,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(52207184);安徽省科技重大专项(202103a05020019);安徽省自然科学基金杰青项目(2108085J24)资助。

摘　　要：为解决传统模型预测控制在参数失配时预测误差增大的问题,该文提出一种适用于LC滤波型电压源逆变器的无模型预测电压控制策略。该策略建立了基于电压和电流双梯度的查询表,通过计算和存储上一时刻应用矢量作用下的电压和电流梯度,并结合当前时刻的采样值,实现未来时刻电压和电流的无模型预测;进一步重构状态空间预测方程,根据应用矢量作用下的电压和电流梯度实时更新未应用矢量的梯度值,保证了梯度的准确性;使用电压和电流双目标的价值函数进行跟踪评估,进而选取下一控制周期最优的矢量。该方法不依赖于任何系统参数、计算简单,且消除了传统无模型预测中梯度更新停滞现象,改善了输出电压性能。最后通过实验验证了所提方法的有效性和优越性。This paper proposes a model-free predictive voltage control strategy for LC-filtered voltage source inverters to solve the problem that the prediction error increases when the parameters of conventional model predictive control are mismatched.The strategy establishes a look-up table based on the double gradients of voltage and current.By calculating and storing the voltage and current gradients under the action of the application vectors at the previous time,combined with the sampling values at the current time,the voltage and current at the future time can be predicted.The state space prediction equation is further reconstructed.The gradient value of the unapplied vector is updated according to the voltage and current gradients under the action of the applied vector.The voltage and current cost functions evaluate and select the optimal vector in the next control period.This method is independent of system parameters and simple,which can eliminate the stagnation of gradient updating in the conventional model-free prediction and improve the output voltage performance.Finally,simulation and experiment verify the effectiveness and superiority of the proposed method.Firstly,the look-up table of the capacitor voltage gradient and the inverter-side current gradient is designed.Based on the gradient information,the voltage and current can be predicted without parameters.Secondly,the proposed method reconstructs the state-space prediction equation to ensure real-time updates of all gradients in each control period,eliminating the stagnation phenomenon of conventional model-free predictive control.In addition,the output voltage quality is further improved using the cost function with two control targets.Finally,the effectiveness of the proposed method is verified by experiments.Simulation results on the voltage-current gradient updating show that the root mean square error(RMSE)of the conventional updating method is 6.91 V,and the RMSE of the proposed model-free predictive voltage control(MFPVC)updating method is 3.66 V,w

关 键 词：电压源逆变器 LC型滤波 无模型预测电压控制 梯度更新 

分 类 号：TM464[电气工程—电器]