Distributed Inter-Regional Dispatching Method Based on Alternating Direction Method of Multipliers

Aiming at the coordinated optimal dispatching problem of interconnected power system, a distributed interregional economic dispatching method based on alternating direction method of multipliers (ADMM) is proposed. Firstly, considering the constraints such as the upper and lower limits of units’ output, ramping rate and reserve within the regions and the power transaction plan of tie line, a centralized dispatching model of inter-regional interconnected power system is established. Then, the centralized model is reconstructed based on ADMM to establish a distributed dispatching model with sub regions as the basic units. Only the information of tie-line power is exchanged among regions, and there is no need to deliver the units’ and load’s information within regions, which effectively protects the privacy data. In order to cope with the uncertainty of load and renewable energy, the method of conditional value at risk (CVaR) is adopted to control the fluctuation of cost. Finally, the proposed method is applied to improved IEEE-118 bus system for simulation, and the results verify the effectiveness of the proposed method.