CAJ | 학술논문

现有文献对光伏微电网孤岛运行时可能存在的多种振荡模式研究较少。文中针对一种含有光伏电源的典型微电网,建立了系统孤岛运行时的全阶小信号模型。通过特征值分析,揭示该微电网中存在5~20 Hz,60 Hz及800~1000 Hz这3种主导振荡模式。通过计算参与因子分析了特征值对状态变量的敏感度,揭示了各振荡模式的起因。利用该模型分析了控制器和网络参数变化对系统小干扰稳定性的影响。利用微电网物理实验平台进行扰动测试,实验结果准确地反映了以上3种振荡模式,说明所建立全阶小信号模型的正确性。该模型的建立为优化微电网中光伏电源主电路和控制器参数提供了依据。
현유문헌대광복미전망고도운행시가능존재적다충진탕모식연구교소。문중침대일충함유광복전원적전형미전망,건립료계통고도운행시적전계소신호모형。통과특정치분석,게시해미전망중존재5~20 Hz,60 Hz급800~1000 Hz저3충주도진탕모식。통과계산삼여인자분석료특정치대상태변량적민감도,게시료각진탕모식적기인。이용해모형분석료공제기화망락삼수변화대계통소간우은정성적영향。이용미전망물리실험평태진행우동측시,실험결과준학지반영료이상3충진탕모식,설명소건립전계소신호모형적정학성。해모형적건립위우화미전망중광복전원주전로화공제기삼수제공료의거。
The potential multiple oscillation modes existing in a photovoltaic (PV) microgrid are seldom,if ever,studied in previous references.A full-order small signal model is developed for a typical microgrid containing a PV micro-source.Three dominant oscillation modes are discovered through eigenvalue analysis,namely,5 Hz to 20 Hz oscillation,60 Hz oscillation, and 800 Hz to 1 000 Hz oscillation,respectively.The sensitivities of eigenvalues of the state variables are analyzed through participation factors,and the origin of each oscillation mode is revealed.The influences of the variation of the controller and network parameters on system small signal stability are analyzed through the model developed.Through disturbance tests in an experimental laboratory microgrid,the three oscillation modes are exactly observed,verifying the correctness of the established full-order small signal.This model can help optimize the parameters of both the main circuit and the controller of a PV micro-source.