基于模型预测控制的Buck型双向DC-DC变换器动态补偿控制  

Dynamic Compensation Control of Buck-type Bidirectional DC-DC Converter Based on Model Predictive Control

作　　者：孟良 胡雪凯 MENG Liang;HU Xuekai(Electric Power Research Institute,State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang 050021,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,石家庄050021

出　　处：《电源学报》2024年第2期90-97,共8页Journal of Power Supply

摘　　要：针对直流微电网中负载投切、功率波动和二倍频注入导致的直流电压波动问题,提出了一种基于模型预测控制的Buck型双向DC-DC变换器动态补偿控制策略。首先,建立Buck型双向DC-DC变换器的离散状态空间矩阵,并以输入电流为扰动量。其次,设计Buck型双向DC-DC变换器的基于模型的内环电流预测控制和外环电压控制。然后,针对电流扰动设计基于残差生成器的动态补偿控制结构,并求解动态补偿控制器Q(z),同时利用最小二乘递推算法进行参数辨识,减少模型不确定性对动态补偿控制策略的影响。最后,在PSCAD/EMTDC仿真平台上设计对比实验,验证所提控制策略的有效性。通过实验结果可知,该补偿控制结构在不改变原预测控制的前提下,可以有效地解决直流母线电压波动问题,增强整个系统的鲁棒性。Aimed at the problem of DC voltage fluctuations caused by load switching,power fluctuations and dou-ble-frequency injection in DC microgrids,a dynamic compensation control strategy for a Buck-type bidirectional DC-DC converter based on model predictive control(MPC)is proposed.First,the corresponding discrete state space matrix is es-tablished,and the input current is used as the disturbance.Second,the model-based inner-loop current predictive control and outer-loop voltage control of the Buck-type bidirectional DC-DC converter is designed.Third,a dynamic compensa-tion control structure based on a residual generator is designed for the current disturbance,and the dynamic compensa-tion controller Q(z)is solved.At the same time,the recursive least squares algorithm is used for parameter identification to reduce the influence of model uncertainty on the dynamic compensation control strategy.Finally,a comparative ex-periment was designed on the PSCAD/EMTDC simulation platform to verify the effectiveness of the proposed control strategy.Experimental results show that the compensation control structure can effectively solve the problem of DC bus voltage fluctuations and enhance the robustness of the entire system without changing the original predictive control.

关 键 词：直流微电网 预测控制 残差生成器 动态补偿 

分 类 号：TM464[电气工程—电器]