功率连接型数字物理混合仿真系统(二)适应有源被试系统的新型接口算法

A Power Hardware-in-the-loop Simulation System Part Two A Novel Interface Algorithm Adapted to Active Hardware-under-test

将实时数字仿真技术和动态物理模拟技术结合起来,可以对含可再生能源和储能的微网系统进行研究与测试。由于被试系统为有源系统,对混合仿真系统的接口算法提出了更高的要求。针对简化阻尼阻抗接口,设计了一种适用于有源被试系统的阻抗跟踪算法,实现了实时阻抗匹配。提出了一种新的混合接口模型,新接口用理想变压器接口构成前向驱动器,以激励物理模拟系统;由简化阻尼阻抗接口构成反向观测器,以获得精确的数字仿真结果。MATLAB仿真表明,对于有源被试系统,新接口算法兼顾了简化阻尼接口算法对数字仿真系统的"透明性"以及理想变压器接口的带有源负载能力。

In order to study and test the characteristics of the distributed energy resources and storages embedded in the microgrids,it is important to combine the real-time digital simulation and dynamic physical simulation.The condition that the hardware-under-test（HUT） is active puts forward higher requirement for the interface algorithm in terms of both stability and accuracy.An impedance tracking algorithm for simplified damping impedance method（SDIM） interface is designed to achieve real-time impedance matching of the HUT with power sources（active）.A novel interface algorithm is proposed.It uses the ideal transformer model（ITM） interface to drive the physical HUT and employs the SDIM interface to obtain accurate response in the virtual electrical system.The results of MATLAB simulation show that the novel interface combines the merits of the SDIM interface and the ITM interface when the HUT is active.