摘要
基于dq坐标、序坐标和极坐标的阻抗法是研究变流器振荡问题的常用方法,不同阻抗法可相互转化并在判断系统稳定性方面等价,然而它们的差异性和适应性尚待深入探讨。为此,首先在上述3种坐标系分别建立并网系统阻抗模型,并对比分析其数学和物理特征;其次,分析不同坐标系下阻抗模型的可解耦性,给出所导出的阻抗判据在主导环节分析和机理解释方面的具体区别;进一步,以锁相环高参与度的次/超同步振荡问题为例,针对变流器四象限运行时的不同场景,分别从阻抗判据的标称性和鲁棒性角度分析开环传递函数右半平面极点的存在性和对不确定性参数的灵敏性,并在此基础上分析几种现有阻抗判据的适用场景和条件;最后,利用仿真验证所提结论的有效性。
There are many impedance-based methods for analyzing oscillation of a grid-connected converter system(GCS)via dq frame,sequence frame and polar frame,which can be transformed into each other and are equivalent in assessing the stability of the system.However,the discrepancy and adaptation of these methods have not been discussed theoretically.Therefore,the impedance models of GCS are established in above three kinds of coordinates respectively.Then,the mathematical and physical characteristics of them are analyzed.Next,the decoupling of impedance models in different frames is analyzed,and the differences of the impedance criteria in stability analysis and mechanism interpretation are given.Furthermore,the sub-synchronous oscillation caused by the phase-locked loop considering the converter’s four quadrant operation scenario are illustrated.The existence of open-loop transfer function right-half-plane poles and its sensitivity to uncertain parameters are analyzed,focusing on the nominal performance and robustness of the impedance criteria.On this basis,the adaptation of several impedance criteria of GCS is analyzed.Theoretical analysis and simulations confirm the validity of the proposed conclusion.
作者
艾力西尔·亚尔买买提
辛焕海
宫泽旭
马富艺龙
袁辉
YAERMAIMAITI Aiixier;XIN Huanhai;GONG Zexu;MA Fuyiong;YUAN Hui(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2024年第15期6035-6046,I0016,共13页
Proceedings of the CSEE
基金
国家自然科学基金项目(U2166204,U22B6008,52207140)。
关键词
阻抗判据
新能源
功率因数
鲁棒性
标称性
impedance-based stability criterion
renewable energy
power factor
robustness
nominal performance
