功率连接型数字物理混合仿真系统 (一)接口算法特性

Power Hardware-in-the-loop Simulation System Part One Characteristics of Interface Algorithms

功率连接型数字物理混合仿真结合了实时数字仿真和动态物理模拟的优点,是未来研究新能源发电和储能设备物理特性和接入技术的关键手段。接口算法是功率连接型混合仿真系统的关键技术。文中从稳定性和精确性2个方面,研究并建立了功率连接型混合仿真系统的接口特性。对阻抗阻尼接口进行了化简,分析了简化阻尼阻抗接口和理想变压器接口的稳定性。分析了简化阻尼阻抗接口对数字仿真系统精确性的影响,得出在阻抗匹配时阻尼阻抗法不受接口延迟影响的透明特性。针对物理模拟系统无源和有源2种情况,分析了简化阻尼阻抗接口和理想变压器接口对物理被试系统精确性的影响,得出理想变压器接口带有源负载能力优于阻尼阻抗接口的结论。根据理论分析结果,给出了在各种情况下选择接口算法的原则。

By combining the merits of real-time digital simulation and dynamic physical simulation,power hardware-in-the-loop（PHIL）has become the crucial means of research on the physical properties and integration techniques of renewable energy and energy storage devices in the future.As the interface algorithm is the key to the PHIL system,the stability and accuracy characteristics of the interface algorithms are studied and established.The damping impedance method（DIM）interface is simplified,the stability of the simplified DIM interface and ideal transformer model（ITM）interface is studied.The impact of simplified DIM interface on the digital simulation system is analyzed,and it is discovered that,when the damping impedance in the virtual electrical system（VES）matches the equivalent impedance in the hardware under test（HUT）,the simplified DIM interface is characterized by transparency which means that the response in the digital simulation is not affected by the delay due to the interface.The characteristics of simplified DIM interface and ITM interface with respect to the response accuracy of the HUT are studied for the HUT with and without a power source.It is concluded that the driving capability of the ITM interface is better than that of the DIM interface when the HUT has a power source.Based on the results of analysis,the principles of selecting a suitable interface algorithm under different conditions are given.