微电网切换至孤岛运行时的小信号稳定性分析  

Small-signal Stability Analysis of a Microgrid Switching to Islanded Mode

作　　者：郑竞宏[1] 李兴旺[2] 王燕廷 朱守真[1] 王小宇[1] 祝洪博[2] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室清华大学,北京市100084 [2]东北电力大学电气工程学院,吉林省吉林市132012 [3]齐齐哈尔市电业局,黑龙江省齐齐哈尔市161006

出　　处：《电力系统自动化》2012年第15期25-32,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50823001;51007044)~~

摘　　要：微电网平稳切换至孤岛运行模式是保证微电网内重要负荷持续可靠供电的重要手段之一。以V/f孤岛控制方式的微电网为研究对象,建立了孤岛模式下的微电网小信号模型,并利用特征根分析法分析了V/f控制器参数变化、负荷阻抗及线路阻抗变化对切换过程中系统小信号稳定性的影响规律,并用时域仿真进行了验证。其后,讨论了系统不同工况下对主导特征值的参数灵敏度的影响规律。最终获得了保证微电网平稳切换至孤岛运行模式的主导影响参数和影响因素,其结论可为微电网平滑切换控制方法和策略提供参考。Smooth-switching of microgrid to islanded mode is of the important to guarantee the continuous power supply to the important loads. This paper firstly studies the V/f controller of the microgrid that operates in islanded mode, and establishes a small-signal state space model for inverter based on the V/f controller. Then the eigenvalues are used to analyze the stability in the smooth-switching when the V/f controller parameters, the load impedance and the equivalent line impedance change. The results are verified by time-domain simulations. Secondly, the sensitivity of the parameters to the dominant eigenvalues is analyzed when the power load level changes. Finally, the dominant parameters and factors that can guarantee the microgrid to achieve smooth-switching are obtained, which can be the reference for the switching control methods and strategies.

关 键 词：微电网 V/F控制 小信号稳定性 孤岛运行 平滑切换 

分 类 号：TM727[电气工程—电力系统及自动化] TN911.6[电子电信—通信与信息系统]