Robust Decentralized Coordination of Transmission and Active Distribution Networks

In this paper, a novel robust decentralized dispatch approach is presented, which can efficiently coordinate the transmission network and connected active distribution networks (ADN). The concept of allowable power exchange interval (APEI) is introduced in the coordination of the integrated networks so that the transmission network can receive reserve capacity support from connected ADNs, which further exploits the flexibility in ADNs. Meanwhile, the risk of accommodating wind power has also been considered in the optimization to make a trade-off between the operational risk and costs and a tradeoff between the transmission network and ADNs. Besides, the alternating direction method of multipliers (ADMM) is adopted to decompose the centralized robust coordinated dispatch model for the integrated transmission network and ADNs into several dispatch sub-models. To efficiently release the computational burden, a new affine policy is adopted to transform the resulting nonlinear sub-models into linear optimization sub-problems that can be optimized effectively and globally with off-the-shelf solvers. The effectiveness and efficiency of the proposed robust decentralized approach was validated using two test systems.