Optimal configuration method of series reactor for limiting short-circuit current

Abstract

The invention provides an optimal configuration method of a series reactor for limiting short-circuit current. In the method, the economic cost for configuring the series reactor is taken as a target function, and comprises the manufacturing cost, installation cost and support equipment cost of the series reactor. The three-phase short-circuit current of a bus and the transient stability margin of a system are solved through respectively using a classic short-circuit current calculation algorithm and a controlling unstable equilibrium point (CUEP) method, and corresponding constraint conditions are set for the short-circuit current, the transient stability margin and the voltage of the bus so as to meet requirements of the system on safe operation. By using the technical scheme of the invention, the problem that the calculated amount is too large to be realized after the transient stability margin is contained in the constraint conditions is effectively solved, and the current limit scheme meeting the system operation requirements is provided, thereby making up the gap of the field in China and simultaneously having relatively high economical efficiency and practical value.

Description

technical field [0001] The invention relates to a method for configuring series reactors to limit short-circuit current, which is used to improve the efficiency of formulating configuration schemes, and at the same time ensure normal and stable operation of the system after adopting the configuration schemes by constraining system state variables. It belongs to the field of power system operation and planning. Background technique [0002] With the further expansion of the scale of my country's power grid and the continuous investment of large-capacity generators, the three-phase short-circuit current on the high-voltage side of the important 500kV hub substation is already facing the threat of exceeding the breaking current of the circuit breaker, which seriously reduces the system's ability to resist risks and dispatch flexibility. . At present, the methods that can be used to limit the three-phase short-circuit current of 500kV EHV system are divided into two categories, ...

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Problems solved by technology

Moreover, modern optimization algorithms (such as particle swarm optimization, genetic algorithm, etc.) have the disadvantage of insufficient global optimization, and the optimization result may be a local optimal solution, which does not guarantee that the optimization result is the theoretical optimal solution.

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