Scheduling method to restore system security after multiple faults in power system

Abstract

The invention provides a dispatching method for restoring system security of an electric power system after multiple failures, and relates to the technical field of electric power systems. First a safe economic dispatching model is established and is converted to a two-stage decision model, a multi-stage robust optimization model is decomposed into a main problem and a sub problem, the main problem and sub problem are solved repeatedly, an upper bound and a lower bound of the main problem are updated, the worst scene is identified again, till a difference value of the lower bound and the upper bond of the main problem does not exceed a convergence level or reaches a maximum alternation number of items, and an optimal solution to the main problem is output. The dispatching method adopts an N-K safety criterion that satisfies power grid operation conditions, thereby enabling a calculated result to have practical guiding significance, and the thought of adopting robust optimization avoids the problem that under the N-K safety criterion, an equipment failure accident set is large in amount, and the dispatching problem cannot be solved; and a column constraint generating algorithm is adopted to decompose the multi-stage robust optimization problem into the main problem and the sub problem, thereby improving solving efficiency.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a scheduling method for restoring system safety after multiple faults in the electric power system. Background technique [0002] The safe and economical operation of the system has always been a hot issue that power companies and power researchers have always paid attention to. There are two main models of security constrained economic dispatch methods widely used in actual power systems: preventive security constrained optimal power flow (PSCOPF) and corrective security constrained optimal power flow (PSCOPF). optimal power flow, CSCOPF). The PSCOPF method requires that the control decisions under normal conditions can meet the safety and economic constraints without adjustment under anticipated accidents, and the economy is low, and the results obtained are very conservative; the CSCOPF method adopts different control decisions under normal conditions and vario...

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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the prior art and provide a scheduling method for restoring system security after multiple faults in the power system. This method can effectively solve the problem that the scheduling problem cannot be solved due to the huge number of equipment failure accident sets under the N-K safety criterion. question

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