适用于微电网的直流型大功率数模混合仿真接口方法

DC-type High-power Interface Method of Digital-analog Hybrid Simulation Suitable for Microgrids

为满足微电网数模混合仿真大功率和双向功率流的需求,提出了一种直流型的大功率接口方法。首先研究并提出了一种适用于直流系统的稳定性改进接口算法,试验验证了其具有更大的稳定裕度;然后针对直流型数模混合仿真,提出了基于H桥的双向直流型大功率接口的模块化设计方法,可同时满足大容量和功率双向流动的要求。针对同一等值网络进行仿真,加入所提接口的混合仿真与数字仿真的结果一致,验证了该大功率接口方法的有效性;设计基于模糊控制的能量管理策略的应用场景并开展数模混合仿真试验,试验结果验证了直流型大功率接口及其构成的混合仿真系统的稳定性、动态性能和在微电网中的适用性。

To meet the requirements of high power and bidirectional power flow of digital-analog hybrid simulation for microgrids,a DC-type high-power interface method is proposed.Firstly,an improved stability interface algorithm suitable for DC systems is proposed,and its greater stability margin is verified by experiments.Then,for the DC-type digital-analog hybrid simulation,a modular design method of the bidirectional DC-type digital-analog hybrid simulation high-power interface based on H-bridges is proposed,which can meet the requirements of large-capacity and bidirectional power flows.For the same equivalent network,the hybrid simulations including the proposed interface and the digital simulation are performed,respectively,and the results of the two are basically the same,which verifies the effectiveness of the high-power interface method.Moreover,the application scenario of the energy management strategy based on fuzzy control is designed and the hybrid simulation experiment is conducted.The stability,dynamic performance,and the applicability to the microgrid of the DC-type high-power interface and its hybrid simulation system are verified by experiment results.