Cross-region DC tie line power optimization method taking number of operation times of power equipment into consideration

Abstract

The invention belongs to the technical field of power system operation and scheduling, and particularly relates to a cross-region DC tie line power optimization method taking the number of operation times of reactive power equipment into consideration. The method comprises the steps of establishing a cross-region DC tie line power optimization main problem model based on DC power flow, and controlling the number of operation times of the reactive power equipment according to operation times constraints of the reactive power equipment; and establishing a power flow checking sub-problem model, ensuring that the optimal solution of the main problem satisfies security constraints and steady-state operation characteristics of a converter station, respectively establishing reactive power equipment connection constraints in main and sub-problems so as to achieve the unification of reactive power equipment solutions of the main and sub-problems. Iterative optimization is performed on the mainproblem and the sub-problem by adopting a Benders decomposition method, the sub-problem feeds back feasibility constraints to the main problem to modify the optimization space of the main problem. Themethod fully digs the coordination and optimization benefits between the flexible regulation ability and the DC reactive power regulation characteristic of the DC tie line, promotes the consumption of wind power in the transmission end power grid at the same time, reduces the peak regulation pressure of thermal power units and realizes the operation economy of the DC cross-region interconnected power grid.

Description

technical field [0001] The invention belongs to the technical field of electric power system operation and dispatching, and in particular relates to a power optimization method of a cross-area DC tie line taking into account the number of actions of reactive power equipment. Background technique [0002] Most of the large-scale wind power bases in my country are far away from the load center, and it is difficult to consume them locally. Therefore, they need to be transported to the load center through high-voltage direct current transmission to realize the cross-regional consumption of wind power and promote the optimal allocation of resources. The traditional DC day-ahead transmission plan is compiled based on the load peak-valley difference of the receiving-end power grid, which will not only cause wind curtailment in the sending-end power grid, but also increase the peak-shaving pressure of thermal power units in the sending-end power grid. The flexible adjustment of the ...

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Problems solved by technology

Although Document 2 considers the action of reactive power equipment, its modeling of the action of reactive power equipment on both sides of the DC is very rough, and does not fully consider the factors that affect the action of reactive power equipment

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