在直流微电网中,针对ISOP-DAB变换器各模块功率不平衡、动态性能差以及变换器回流功率大的问题,该文在扩展移相调制下将双环解耦策略与超螺旋滑模相结合,均压环采用PI控制、输出电压环采用超螺旋滑模控制。在扩展移相调制下,分析单模块双有源桥（DAB）变换器的两种传输功率模型、软开关特性,建立变换器的降阶模型。应用KKT条件法求解各模块的最优内移相比D1i,通过降阶模型及超螺旋算法设计超螺旋滑模控制器,且与均压环共同作用生成外移相比D2i,以调节变换器输出电压。最后,搭建两模块ISOP-DAB实验平台进行实验验证,实验结果表明ISOP-DAB系统能在保证各子模块输入均压的同时提高变换器的动态性能,且有效减小变换器产生的回流功率。
Abstract
In DC microgrid, aiming at the problems of power imbalance, poor dynamic performance and high backflow power of ISOP-DAB converter, in this paper, the double-loop decoupling strategy is combined with the super twisting sliding mode under extended phase-shift modulation. PI control is used in voltage balancing ring and super twisting sliding mode control is used in output voltage ring. Under extended phase shift modulation, two transmission power models and soft switching characteristics of single-module DAB converter are analyzed, establish the reduced order model of the converter. KKT condition method is applied to solve the optimal internal shift ratio D1i of each module, and the super twisting sliding mode controller is designed by the reduced order model and the super twisting algorithm, and the external shift ratio D2i is generated by the interaction with the pressure balancing ring to achieve power balance and improve dynamic performance. Finally, a two-module ISOP-DAB experimental platform is built for experimental verification. The experimental results show that the ISOP-DAB system can improve the dynamic performance of the converter while ensuring the input voltage balancing of each submodule, and effectively reduce the backflow power generated by the converter.
关键词
直流微电网 /
超螺旋滑模控制 /
动态性能 /
ISOP-DAB变换器 /
回流功率优化
Key words
DC microgrid /
super-twisting sliding mode control /
dynamic performance /
ISOP-DAB converter /
backflow power optimization
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基金
河南省重点研发专项（241111241700）; 河南省科技攻关项目（252102241041）
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