Decentralized Distributionally Robust Coordinated Dispatch of Multi-area Power Systems Considering Voltage Security

Abstract

In this paper, a new dispatch approach for multiarea power systems is proposed, where active power and reactive power are simultaneously optimized in a decentralized manner with the aid of reactive power support from conventional generators and wind farms. The automatic voltage control (AVC) strategy for conventional generators and wind farms is employed to mitigate the risk of under-or over-voltage and thus the voltage security will be ensured in the optimization. According to the proposed approach, the admissible regions of wind power is also optimized via striking a balance between the operational cost and risk. On the other hand, considering that in practice, it is hard to exactly estimate the true probability distribution of wind power, the distributionally robust optimization is utilized in the proposed approach to account for the uncertainty of wind power probability distributions. In addition, to improve the computational efficiency, an efficient algorithm is also developed. Numerical results illustrate that compared with the conventional decentralized dispatch approaches, the proposed decentralized approach can obtain more optimal dispatch decisions in terms of operational costs and renewable utilization.