并联级联H桥电源电流跟踪优化与环流抑制的模型预测控制  

Model Predictive Control of Current Tracking Optimization and Circulating Current Suppression for Multi-Parallel Cascaded H-Bridge Power Supplies

作　　者：黄海宏[1] 颜碧琛 王海欣[1] Huang Haihong;Yan Bichen;Wang Haixin(School of Electrical Engineering and Automation Hefei University of Technology,Hefei 230000 China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230000

出　　处：《电工技术学报》2023年第16期4376-4390,共15页Transactions of China Electrotechnical Society

基　　金：区域创新发展联合基金资助项目(重点支持项目)(U22A20225)。

摘　　要：分布式控制在级联H桥(CHB)变换器并联的电源中可提升输出容量及可靠性。然而,常规分布式控制器可能由于硬件或控制参数的不匹配而导致输出功率不平衡,从而在CHB支路之间形成不稳定的环流,这将导致:①支路电流的稳定性与跟踪性能变差;②均流电抗器易饱和。对此该文提出一种基于Luenberger观测器状态重构的主从模型预测控制,所提策略可以实现参考电流跟踪和环流抑制的控制优化。此外,通过载波可以轻松实现级联H桥交错和并联控制器同步,从而固定开关频率。基于推导出的电流预测模型,当多个并联CHB支路具有不同的输出功率时,可以实现优化的电流跟踪响应并消除环流。仿真和实验结果验证了所提方法的有效性。When the cascaded H-bridge(CHB)converter with an isolated DC-link is used as a power supply in parallel through the current-sharing reactor,the distributed controller will form an unstable circulating current between the parallel branches due to the parameter difference.However,when the output power is unbalanced,the conventional linear controller cannot actively suppress the circulating current,resulting in degraded reference tracking performances.Recent studies have proposed parallel methods based on improved master-slave predictive control.However,the problems of more stable circulating current observation and a large amount of computation still exist.Therefore,this paper proposes a parallel method of carrier-based model predictive control(MPC)and improved master-slave control.When the output power is unbalanced,the reference tracking and a circulating current suppression are realized by optimizing the global control value through the proposed prediction model.Firstly,the master controller reconstructs the branch current into the common load inductor current and the branch circulating current through the Luenberger observer.Secondly,a global cost function is established to optimize the reference tracking and the circulating current suppression.Finally,the globally optimized control values are sent to the slave controllers,and the interleaved H-bridges are managed by the respective carrier phase shifted pulse width modulation(CPSPWM)modulator.The master and slave controllers have similar optimized timing based on the carrier,and slave controllers only communicate with the master controller.In the proposed method,the Luenberger outputs stable state observations,the MPC solves the global optimal control values,the CPSPWM modulator fixes the switching frequency of the interleaved H-bridge,and the improved master-slave control reduces the communication resource.Therefore,the proposed method can realize stable reference tracking and the circulating current suppression in the parallel CHB power supply.The results sho

关 键 词：预测控制 级联H桥变换器 并联 主从控制结构 电流跟踪 环流 观测器 

分 类 号：TL62[核科学技术—核技术及应用] TM46[电气工程—电器]