摘要
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800~1 000 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。
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.
出处
《电力系统自动化》
EI
CSCD
北大核心
2014年第10期17-23,共7页
Automation of Electric Power Systems
基金
国家留学基金资助项目
中国博士后科学基金资助项目(2013M541581)~~
