Optimal power flow calculation method considering discrete and sequential decision variables for large-scale power distribution network

Abstract

The invention relates to an optimal power flow calculation method considering discrete and sequential decision variables for a large-scale power distribution network. The optimal power flow calculation method is characterized by comprising the following steps of building a mathematical model of a complicated three-phase unbalanced power distribution network, carrying out complicated optimal power flow calculation decomposition, and carrying out a simplification process on network loss calculation of the three-phase unbalance power distribution network. By the optimal power flow calculation method, the complicated optimization problem can be decomposed into an integral linear programming primal problem and a non-linear feasible subproblem, decision making optimization and system security constraint are organically combined by using mutually-iterated calculation decisions, the optimal power flow is embedded to a decision process, and meanwhile, rapid calculation on asymmetric power flows at a large scale is achieved. The optimal power flow calculation method is suitably used for three-phase unbalance power flow calculation, looped network structure, bidirectional power flows, real-time decision of discrete and sequential decision and optimal power flow, and has the advantages of scientific reasonableness, high adaptability, operation accuracy, high speed and the like.

Description

technical field [0001] The invention relates to the technical field of distribution networks, and relates to an optimal power flow calculation method for large-scale distribution networks considering discrete and continuous decision variables. Background technique [0002] Traditional distribution network operation is static and passive. With wind turbines, photovoltaic power sources, energy storage, micro-grid and other renewable energy connected to the distribution network, the distribution network will change from a radial, one-way power flow, passive management to a ring network, two-way power flow, and active management operation mode . At present, the optimal power flow calculation method mainly focuses on the transmission network, does not involve the three-phase unbalanced distribution network, cannot deal with optimization problems involving large-scale discrete and continuous decision variables, and cannot meet the requirements of real-time calculation. Active di...

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Problems solved by technology

At present, the optimal power flow calculation method mainly focuses on the transmission network, does not involve the three-phase unbalanced distribution network, cannot deal with optimization problems involving large-scale discrete and continuous decision variables, and cannot meet the requirements of real-time calculation

Active distribution network technology is the key technology to solve the grid-connection of renewable energy. At present, active distribution network technology is in the start-up stage. Decision analysis and optimal power flow are calculated separately, which cannot meet the operation and real-time control requirements of active distribution network.

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