全桥LLC变换器的虚拟阻抗有源阻尼方法研究  

Research on Virtual Impedance Active Damping Method for Full Bridge LLC Converter

作　　者：王冠林 胡欲立[1] WANG Guanlin;HU Yuli(Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学,西安710072

出　　处：《自动化与仪器仪表》2024年第12期89-93,共5页Automation & Instrumentation

摘　　要：为进一步提升直流微电网的运行稳定性,针对基于LLC变换器的电网级联系统存在的电压振荡问题,提出一种基于虚拟阻容的有源阻尼控制方法。其中,基于有损LC滤波器和Buck变换器进行级联系统的构建,同时构建等效阻抗模型的构建,在此基础上进行级联系统控制方法的构建,进一步提升电网系统的稳定性。实验结果表明,与未引入控制方法前的级联系统相比,引入基于虚拟阻容的有源阻尼控制方法后的级联系统的稳定性得到了明显提升,同时,级联系统中的电压振荡情况得到了明显改善,电压的波动幅度更小,运行更加平稳。综上,所构建的基于虚拟阻容的有源阻尼控制方法优化效果良好,可有效解决级联系统的电压振荡问题,进而提升系统的电压稳定性,可帮助管理人员进一步提升电网系统日常管理和维护水平,具有一定的实际应用价值。To further improve the operational stability of DC microgrids,a virtual resistance capacitance based active damping control method is proposed to address the voltage oscillation problem in the LLC converter based cascaded power grid system.Among them,a cascaded system is constructed based on a lossy LC filter and Buck converter,and an equivalent impedance model is constructed.Based on this,a cascaded system control method is constructed to further improve the stability of the power grid system.The experimental results show that compared with the cascaded system before the introduction of control methods,the stability of the cascaded system after the introduction of active damping control method based on virtual resistance and capacitance has been significantly improved.At the same time,the voltage oscillation situation in the cascaded system has been significantly improved,with smaller voltage fluctuation amplitude and smoother operation.In summary,the constructed active damping control method based on virtual resistance and capacitance has a good optimization effect,which can effectively solve the voltage oscillation problem of cascaded systems,thereby improving the voltage stability of the system.It can help management personnel further improve the daily management and maintenance level of the power grid system,and has certain practical application value.

关 键 词：微电网 虚拟阻抗 有源阻尼 BUCK变换器 电压振荡 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]