基于电力电子变压器的低压微电网负荷灵敏度在线辨识

负荷灵敏度在线辨识是一种新的负荷建模方法，在对含有电力电子变压器(power electronic transformer，PET)的低压微电网负荷灵敏度在线辨识方法及应用进行深入研究的基础上，首先建立了AC/DC/AC型PET的数学模型，并给出了PET实现负荷灵敏度在线辨识的基本方法，分析了分布式电源的接入对辨识结果的影响；在此基础上，提出了一种基于PET电压/频率协调控制的微电网柔性负荷控制策略。仿真结果表明，在线辨识方法可以实时获得负荷模型参数，依据所获负荷模型，PET通过跟踪系统柔性减载指令，实现系统柔性控制与管理，为电网柔性负荷控制提供技术支持。

Online Load Sensitivity Identification in Low-Voltage Microgrids Based on Power Electronic Transformer

Online load sensitivity identification is a novel load modeling method. Based on the research on the online load sensitivity identification method for low-voltage microgrid containing power electronic transformer(PET) and its application,firstly, in allusion to the PET based low-voltage microgrid a mathematical model of AC/DC/AC type of PET was established and a basic method to implement the online load sensitivity identification by PET was given, besides, the influence of switching-in distributed generation on identification results was analyzed in depth. Secondly, on this basis, a flexible load control strategy for microgrid, which was based on PET voltage/frequency coordinated control, was proposed. Simulation results show that by use of online identification the parameters of load model can be obtained in real-time, and in terms of the obtained load model it is possible to track flexible load shedding instructions by PET system to implement flexible control and management of microgrid to provide technical support for flexible load control of microgrid.