城市应急微网群管控关键技术综述OA

When a large-scale power outage occurs in the urban power grid,microgrids containing electric vehicles,distributed power sources,etc.can build an emergency microgrid cluster to ensure the continuous power supply of key loads.However,high proportion of new energy and high degree of power electronization make the emergency microgrid cluster face the stability challenges of transient voltage and frequency in operation.In the process of microgrid cluster energy management,transient security and stability constraints need to be considered.The transient security and stability domain of microgrid clusters has strong nonlinearity,and the differential regulation characteristics of discrete and continuous devices,as well as the computing power and communication methods of energy management terminals,make it difficult to consider security and stability regulation.According to the internal logic of"dynamic modeling-stability analysis-coordinated regulation",the following review was carried out around the coordinated regulation of urban emergency microgrid cluster considering transient security and stability constraints.1)The dynamic modeling methods of microgrid considering the wide frequency domain and non-smooth control characteristics of the converter.2)The mechanism and criterion of voltage and frequency transient security and stability of microgrid cluster.3)Distributed optimal control method of microgrid cluster considering transient security and stability constraints,information interaction delay and discrete-continuous hybrid characteristics.Based on the above three aspects,the shortcomings and development direction of the current research on the security and stability of urban emergency microgrid cluster and the operation of low-carbon economy were expounded.