CAJ | 학술논문

由于分布式电源及负荷的特殊性，稳定性成为了制约微电网发展的因素之一。文中针对微电网孤岛运行模式下多个逆变器参与系统调压调频时的微电网小干扰稳定问题，对逆变器采用P-f和Q-V下垂控制，并考虑控制器和负荷网络的动态特性，建立微电网系统的小干扰稳定模型。利用该模型计算系统特征值，直观分析微电网的稳定性，证明所研究的系统能够稳定运行。文中还进一步探讨了系统参数改变时特征值的相应变化，并计算了特征值参与因子，将其作为度量的标准，为控制器参数的优化设计提供了依据，为有效提高微电网小干扰的稳定性提供了参考。
유우분포식전원급부하적특수성，은정성성위료제약미전망발전적인소지일。문중침대미전망고도운행모식하다개역변기삼여계통조압조빈시적미전망소간우은정문제，대역변기채용P-f화Q-V하수공제，병고필공제기화부하망락적동태특성，건립미전망계통적소간우은정모형。이용해모형계산계통특정치，직관분석미전망적은정성，증명소연구적계통능구은정운행。문중환진일보탐토료계통삼수개변시특정치적상응변화，병계산료특정치삼여인자，장기작위도량적표준，위공제기삼수적우화설계제공료의거，위유효제고미전망소간우적은정성제공료삼고。
Due to the particularity of distributed generators and loads,system stability has become an important fac-tor that restricts the development of micro-grid.In order to implement the small-signal stability of micro-grid during the isolated island operation when several inverters participate in the system voltage and frequency control,a small-signal model of micro-grid containing inverters with P-fand Q-V droop control,which takes into consideration the dynamic characteristics of the controller and the network,is established.Then,the model is used to calculate the system eigenvalues and analyze the small-signal stability of micro-grid intuitively,with its effectiveness being also verified.Moreover,the variation of engenvalues with the system parameters are discussed,and the parameter par-ticipation factors are calculated and are used as the measurement indexes for the optimization design of controller parameters.The research provides a foundation for the stability improvement of micro-grid.