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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。
Combining real-time digital simulation with dynamic physical simulation allows research and testing of microgrid systems that include renewable energy and energy storage. Because the tested system is an active system, the interface algorithm of hybrid simulation system puts forward higher requirements. In order to simplify the damping impedance interface, an impedance tracking algorithm suitable for the active test system is designed, which realizes real-time impedance matching. A new hybrid interface model is proposed. The new interface uses an ideal transformer interface to form a forward driver to stimulate the physical simulation system. The simplified damping impedance interface forms an inverse observer to obtain accurate digital simulation results. MATLAB simulation shows that for the active system under test, the new interface algorithm takes into account the “transparency” of the simplified damping interface algorithm to the digital simulation system and the active load capability of the ideal transformer interface.