Research On Calculation And Adjustment Strategy Of The Closed-loop Current In Complex Distribution Network

With the development of modern power grids, intelligent distribution network has become a focus of public concern. Intelligent distribution network is based on advanced distribution automation, of which the core technology is distribution network intelligent dispatching, it is based on the implementation of feeder automation. The closed-loop operation in distribution network is an important measure in the case of power supply reliability assurance, load transfer, fault treatment, and equipment maintenance in distribution network of our country, however, the dispatchers have to adjust some devices for reducing the closed-loop current aroused from the operation. If the policy embedded advanced closed-loop control of distribution automation system, programmed, replaced by intelligent operations manual operation and can prevent human accidents, reducing field personnel's labor intensity, improve the efficiency of closed-loop operation, is of great value.This paper carried out a detailed analysis of the steady-state closed-loop current and the surge closed-loop current in complex distribution network, improved quick decoupling method to adapt to the closed-loop current solution for the integration of transmission network and distribution network. At the same time, based on sensitivity analysis method, derivation that adjusting the transformer ratio, adjust the amount of compensation capacitor, the impact of network reconfiguration on the closed-loop current sensitivity, quantitative description of control effect of mining closed-loop current and also a close relationship between equivalent impedance. Through modeling for integrated closed-loop current control, put forward based on genetic algorithm for integrated closed-loop current control strategies, get better results than a single regulation, with a closed loop current sensitivity sort and filter the initial set of regulatory elements, and based on closed loop current sensitivity calculation establishes the integrated control strategy of alternating component in the possible options for action sequence. Finally, using the program, the calculation results of a typical19-node distribution network and a practical area power system calculation examples verify the validity and practicality of the strategy proposed in this paper.