Non-Iterative Robust Economic Dispatch for Interconnected Grids Based on Tie-Line Power Transfer Regulation

The coordinated dispatch of interconnected grids characterized by maldistributed sustainable energy encounters challenges with regional privacy. Thus, this study proposes a non-iterative robust economic dispatch method for interconnected grids based on tie-line power transfer regulation. The intra-regional stochastic model is transformed into a two-layer robust model and further treated as a single-layer linear model by strong duality theorem. Then, the independent submodules are established by temporal and spatial decomposition to enable parallel execution. The inter-regional power transfer feasible region (PTFR) and intra-regional operation cost feasible region (OCFR) are evaluated using multi-parameter programming theory to ensure the privacy security and cost efficiency of dispatch results, which protects private and sensitive information of each region. Additionally, the boundary of feasible regions is adjusted, allowing for the conservatism budget to address multiple fluctuation intervals of stochastic factors. Finally, information of feasible regions is shared between each intra-regional operator and central coordination layer to incorporate inter-regional power transfer constraints as feasible regions of joint economic dispatch. The intra-regional dispatch strategy could be rapidly obtained following the decision-making of inter-regional dispatch by mapping relations. Case studies by three modified IEEE test systems demonstrate the preciseness and effectiveness of the proposed method.