Loop Closing Control Based on PMU for Active Distribution Network

Abstract

In recent years, because a large number of distributed generations(DGs) and flexible load are connected at the level of distribution network, there are new adjustable units for active distribution network loop closing control. At the same time, the wide application of synchronous phasor measurement unit(PMU) broadens the dynamic monitoring range of distribution network, providing a more reliable data source for loop closing control. Based on this, a loop closing control method based on PMU for active distribution network is proposed in this paper. Firstly, the method utilizes the high-accuracy operating data of PMU to judge the loop closing condition for active distribution network. The active loop closing control strategy of photovoltaic(PV) system have been put forward emphatically, in other words, the control strategy of PV system is actively converted to voltage/reactive power regulation control which could control the voltage for PV generation system at point of common coupling in real time during the loop closing control. Then, according to the voltage difference between two sides of loop closing buses, the network actively adjusts the situation that flexible load access to distribution network. The results of example validate that the loop closing control method for active distribution network proposed in this paper reduces the current from loop closing and current does not exceed the limit, confirming the effectiveness and accuracy of this method, reflecting the active control and management capabilities of the active distribution network.