Research On Optimization Method Of Configuration And Control Strategy For Busbar Automatic Transfer Switch In Multi-voltage Level Distribution Network

Busbar automatic transfer switch is of great significance for quickly restoring the power supply of users and improving the reliability of power supply in distribution network.In multi-voltage distribution networks,unreasonable configuration method and control strategy of busbar automatic transfer switch will not only lead to redundant or unnecessary action of busbar automatic transfer switch,but also lead to power flow overload or prolonging recovery time of power supply.In addition,the parallel operation of distributed generation may also have an impact on the no-voltage detection and synchronism check of busbar automatic transfer switch,which makes it impossible for busbar automatic transfer switch to operate correctly.How to optimize the configuration and control strategy of busbar automatic transfer switch in multi-voltage distribution network to reduce the allocation cost,quickly restore the power supply and improve the reliability of distribution network,has become an urgent problem to be solved.Firstly,this thesis starts with the configuration method and control strategy of busbar automatic transfer switch in multi-voltage distribution network without distributed generation.To obtain busbar automatic transfer switch optimal allocation scheme,this thesis determines the power network topology after busbar automatic transfer switch action based on the current action coordination mode of multi-voltage level busbar automatic transfer switch and the change of power network structure after busbar automatic transfer switch action,and introduces load transferring matrix after busbar automatic transfer switch action.Then,this thesis establishes busbar automatic transfer switch optimal allocation model,with the objective of maximizing the transferred load after busbar automatic transfer switch action and minimizing the number of busbar automatic transfer switch configured,and taking into account the power flow constraints of the "N-1" and "N-1" under equipment overhaul,the equivalent load transferring constraints,the capacity constraints of contact-lines and the capacity constraints of main transformers.This thesis uses improved quantum genetic algorithm to solve the optimal allocation model,and examples to illustrate that the proposed optimal allocation method can be used to allocate busbar automatic transfer switch economicly and effectively.On the basis of meeting the operation criterion of busbar automatic transfer switch,this thesis obtains the action busbar automatic transfer switch level after failure by studying the relationship between fault and action busbar automatic transfer switch level,and establishes busbar automatic transfer switch optimal control model,with the objective of maximum transferred load after busbar automatic transfer switch action and minimum number of action busbar automatic transfer switch level,considering the power flow constraints of the "N-1" and "N-1" under equipment overhaul,the capacity constraints of contact-lines and the capacity constraints of main transformers.This thesis uses improved quantum genetic algorithm to solve the optimal control model.The results of the example analysis show that the optimized control strategy can improve the load transfer capability and shorten the power loss time of users.In order to consider the influence of distributed generation on busbar automatic transfer switch in distribution network,this thesis proposes a modification scheme for the logic of busbar automatic transfer switch so that it can normally perform the no-voltage detection and synchronism check with distributed generation accessed.At the same time,on the basis of the optimization configuration methods and control strategy of busbar automatic transfer switch in power grid without distributed generation,this thesis proposes configuration method and control strategy of busbar automatic transfer switch considering the influence of distributed generation.This thesis considers the randomness of the output power change of distributed generation and the change of the distribution network topology caused by the access of distributed generation,through random power flow calculation,updating of power grid topology and improvement of internal load transferring matrix,The results of the example analysis show that the optimized models can be used to optimize the configuration and control strategy of busbar automatic transfer switch in power grid with distributed generation.