Closed-loop current adjustment strategy in distribution network based on sensitivity analysis

The closed-loop operation, that is, closing the contact switch in a distribution network, can ensure the reliability of power supply, however, the dispatchers have to adjust some devices for reducing the closed-loop current aroused from the operation. In this paper, by analyzing the influencing factors of the closed-loop current and the results of the sensitivity calculation, a important fact was found that when the method of changing network topology is used for adjustment, the change of the Thevenin equivalent impedance cannot be ignored, and the change tendency of the closed-loop current is determined by both the Thevenin equivalent impedance and the open-up voltage difference. According to the sensitivity, we can determine which devices to adjust, the direction of adjustment, and thereby the strategy for the closed-loop current adjustment. It is a theoretical basic for dispatchers.