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<p>In power system, short-circuit current is a key parameter, which directly affects the stability and reliability of power grid. In order to effectively control the short-circuit current, an optimal control method of load dispatching operation is proposed under the restriction of the first peak value of short-circuit current when the power supply is connected to the power grid. On the basis of fully analyzing the process of limiting the first peak value of short-circuit current when the power supply is connected to the power grid, the method calculates the rotating speed of the generator when the power grid is short-circuited, calculates the first peak value of short-circuit current when the power supply is connected to the power grid according to the rotating speed, establishes a load-side response model consisting of a time-sharing electricity price model and a load transfer model based on the peak value, and obtains the load-side response result of the power grid under the first peak value limitation of short-circuit current when the power supply is connected to the power grid. Based on the time-of-use electricity price and load transfer amount obtained by the time-of-use electricity price model and load transfer model when the guaranteed power supply is connected to the power grid, the minimum expected generation cost and load transfer cost of thermal power units in the power grid is taken as the optimal control objective of load dispatching operation, and the objective function is established and the corresponding constraints are set. After solving the objective function, the optimal control of load dispatching operation under the first peak limit of short-circuit current when the guaranteed power supply is connected to the power grid is realized. Experiments show that this method can effectively optimize the load dispatching operation under the restriction of the first peak of short-circuit current when the power supply is connected to the power grid, and the application effect is good and the sensitivity is remarkable.</p>

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The Optimal Control Method of Load Dispatching Operation Under the Limit of Short-Circuit Current Connected to the Power Grid

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • Chang Su,
  • Zhou Yang,
  • Bo Liu,
  • Shun Li

摘要

In power system, short-circuit current is a key parameter, which directly affects the stability and reliability of power grid. In order to effectively control the short-circuit current, an optimal control method of load dispatching operation is proposed under the restriction of the first peak value of short-circuit current when the power supply is connected to the power grid. On the basis of fully analyzing the process of limiting the first peak value of short-circuit current when the power supply is connected to the power grid, the method calculates the rotating speed of the generator when the power grid is short-circuited, calculates the first peak value of short-circuit current when the power supply is connected to the power grid according to the rotating speed, establishes a load-side response model consisting of a time-sharing electricity price model and a load transfer model based on the peak value, and obtains the load-side response result of the power grid under the first peak value limitation of short-circuit current when the power supply is connected to the power grid. Based on the time-of-use electricity price and load transfer amount obtained by the time-of-use electricity price model and load transfer model when the guaranteed power supply is connected to the power grid, the minimum expected generation cost and load transfer cost of thermal power units in the power grid is taken as the optimal control objective of load dispatching operation, and the objective function is established and the corresponding constraints are set. After solving the objective function, the optimal control of load dispatching operation under the first peak limit of short-circuit current when the guaranteed power supply is connected to the power grid is realized. Experiments show that this method can effectively optimize the load dispatching operation under the restriction of the first peak of short-circuit current when the power supply is connected to the power grid, and the application effect is good and the sensitivity is remarkable.