A Trajectory Sensitivity-Based Dynamic Equivalent Model Parameters Optimization Method

doi:10.3969/j.issn.1000-7229.2015.08.005

Abstract

Abstract:

The dynamic equivalent model of power system inevitably exists some errors. The trajectory sensitivities of the tie lines power to the equivalent parameters reveal the quantitative relation between the equivalent error and model parameter, which can be used to optimize the equivalent model parameters. Thus, a trajectory sensitivity-based optimization method was proposed for dynamic equivalent model parameters. Firstly, the definition and calculation of trajectory sensitivity were introduced. Then, the structure of the dynamic equivalent system with consideration of synthesis loads was discussed. The dominant parameters were classed into static or dynamic dominant parameters and optimized separately according to different characteristics of the trajectory sensitivities. Finally, the algorithm was applied in the optimization of the equivalent model of the IEEE 10-machine 39-bus system. The fictitious impedances, inertia time constant, stator impedance and rotor resistance of the equivalent motor were optimized. The simulation results show that the proposed method can improve the precision of the equivalent model effectively. It has a fast convergence speed and needs very little computation tasks, and so has a good application prospect.

Key words: dynamic equivalent model, trajectory sensitivity, synthesis load, parameter optimization

CLC Number:

TM 714

ZHOU Haiqiang, ZHANG Qibing, GU Kanghui. A Trajectory Sensitivity-Based Dynamic Equivalent Model Parameters Optimization Method[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(8): 29-33.

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