多故障工况微网并离网切换教学实验设计

Teaching Experiment Design of Microgrid Off-Grid Switching under Multiple Fault Conditions

微网MG(Microgrid)在发生故障时参数呈现多变特性,为让学生能够直观地了解不同故障工况下MG特征参数演变规律,设计了MG多故障工况下的模拟实验。首先,选择MG控制策略,分析MG故障下的并离网条件;其次,设计MG多工况下的仿真模拟、实验验证流程与方案,分析不同工况下实验模拟数据的演变特征;最后,通过仿真与实际相结合,加深学生对MG在故障过程中的变化特性的理解,提高学生动手实践能力。

The distributed power generation power output in the micro-grid(MG) is uncertain.In case of fault occurring,the parameters are variable.In order to enable students to intuitively understand the evolution law of MG characteristic parameters under different fault conditions,this paper designs a simulation experiment of MG in the condition of multi-fault.Firstly,the control strategy of MG is selected.In the MG fault,on/off grid conditions are analyzed.Secondly,the simulation,experimental verification scheme and process of MG are designed under the condition of normal working,single-phase short circuit,three-phase short circuit and power failure.The evolution characteristics of experimental simulation data under different working conditions are analyzed in detail.Finally,students can better understand the characteristics changing of MG in the process of failure through the combination of virtual simulation and actual verification,and their hands-on practice ability is improved.