考虑直流侧电源特性影响的跟网型变换器控制参数设计  

Control parameter design for a grid-following converter considering the influence of DC-side characteristics

作　　者：闫征 赵清松 徐建源[1] YAN Zheng;ZHAO Qingsong;XU Jianyuan(School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China;Electric Power Research Institute of State Grid Liaoning Electric Power Co.,Ltd.,Shenyang 110006,China)

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870 [2]国网辽宁省电力有限公司电力科学研究院,辽宁沈阳110006

出　　处：《电力系统保护与控制》2025年第5期135-144,共10页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51777130);国网总部科技项目资助(5108-202218280A-2-382-XG)。

摘　　要：为研究不同直流侧电源特性对跟网型变换器(grid-following,GFL)控制参数设计的影响,基于状态空间平均理论建立变换器平均值模型,将典型应用场景下的直流侧端口等效为恒功率源和电流源,推导相电流、锁相环和直流电压控制线性化建模方法,对两种运行方式下的控制器参数进行定量计算。针对恒电流源并网时直流电压控制出现右半平面(right-half plane,RHP)极点、开环不稳定导致系统存在运行失稳风险,从平衡稳定性与快速性的角度出发,确定控制环带宽和相位裕度设计指标,计算控制器参数并结合频率特性进行验证。最后搭建跟网型变换器详细开关模型,开展不同直流侧电源并网仿真分析。结果表明了所提参数设计方案的准确性和有效性,避免了运行方式变化引起的控制参数不适用问题。This paper focuses on analyzing the impact of different DC-side characteristics on control parameter design for grid-following(GFL)converters.Based on the state-space averaging theory,an averaged model of the GFL converter is established.The DC-side terminal in typical application scenarios is equivalently modeled as a constant power source and a constant current source.Linearized modeling methods for phase current control,phase-locked loop(PLL),and DC voltage control are derived,and controller parameters are quantitatively calculated for both operating modes.For grid connection under a constant current source,the right-half plane(RHP)poles introduced by the DC voltage control lead to open-loop instability and potential operational instability.To address this,the control bandwidth and phase margin of the DC voltage control are designed to balance stability and dynamic response speed,with controller parameters being calculated and verified based on frequency characteristics.Finally,a detailed switching model for the GFL converter is constructed,and simulation analyses with different DC-side sources are conducted.The results validate the accuracy and effectiveness of the proposed controller parameter design scheme,ensuring control parameter adaptability in varying operational conditions.

关 键 词：跟网型换流器 恒直流功率源 恒直流电流源 直流电压控制 控制参数设计 

分 类 号：TM46[电气工程—电器]