A Parameter Identification Method for Power Grid Frequency Simulation Based on Simplex Method

Abstract

The invention belongs to the field of an electrical power system and the automation technology thereof, and discloses a power grid frequency simulation parameter identification method based on a simplex method. The method comprises the following steps of: firstly, utilizing a multi-parameter sensitivity analysis method to determine a simulation parameter group to be identified; then, utilizing a simplex algorithm based on a numerical analysis method to intelligently guide a parameter optimizing direction; and utilizing the simulation result of the electromechanical transient simulation program BPA (Bonneville Power Administration) of the electrical power system to calculate a target function value so as to quickly and reliably search an optimal parameter combination. By use of the method, one set of parameters which enable the simulation result to have a smallest error compared with a practical response result can be identified, the accuracy of power grid frequency simulation in the future is improved, simulation time consumption can be shortened, and the optimization efficiency of the parameter identification can be greatly improved.

Description

Technical field [0001] The invention belongs to the technical field of power systems and their automation, and specifically relates to a method for identifying parameters of power grid frequency simulation based on a simplex method. Background technique [0002] Occurred at 21:58:02 on September 19, 2015, Jinsu DC bipolar lockout, the power shortage of the East China Power Grid reached 4.9 million kilowatts, the system frequency before the failure was 49.97 Hz, and the frequency of the whole network dropped to 49.56 Hz after 12s. The amplitude is 0.41 Hz. Under the same operating mode, the frequency drop amplitude calculated by the electromechanical transient simulation program (BPA) under typical parameters is only 0.17 Hz. Although the accident did not cause very serious consequences, it does reflect that the current frequency simulation accuracy of the power grid is not satisfactory and needs to be improved. [0003] With the establishment of the UHV AC / DC hybrid power grid, w...

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Problems solved by technology

The patent application "A method for identifying the prime mover and its governor parameters of a nuclear power unit based on the simplex method" (application number CN201210252089.1) provides a method for identifying the parameters of a nuclear power unit prime mover and its governor based on the simplex method , but this method can only be used for parameter identification of a single unit. It is obvious that the calculation amount is huge and the efficiency is too low when applied to the East China power grid.

The patent application "Governor Parameter Identification Method Combining Frequency Trajectory and Particle Swarm Algorithm" (application number CN201310236183.2) proposes to adjust the governor parameters based on the particle swarm optimization algorithm to make the simulated frequency curve and the measured frequency curve as close as possible Close to, completely ignoring the impact of load factors on frequency in large networks, not universally applicable

The patent application "Modeling Method for Power System Prime Movers and Its Governor" (Application No. CN201010107126.0) proposes a modeling method based on field measurement. Although it can ensure the accuracy of the model and parameters, it can also ensure the simulation of the power system Accuracy, but at present, for the East China Power Grid, the on-site measurement of all units cannot be realized, and the accuracy of the field test results under high frequency has yet to be verified

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