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Method for simplifying electric power system synthetic load model and identifying model parameters

A comprehensive load model and power system technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as difficult realization of online load parameter identification

Active Publication Date: 2015-06-24
TSINGHUA UNIV
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Problems solved by technology

Since the online parameter identification method of the third-order nonlinear model is not yet mature, it is difficult to realize the online load parameter identification

Method used

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  • Method for simplifying electric power system synthetic load model and identifying model parameters
  • Method for simplifying electric power system synthetic load model and identifying model parameters
  • Method for simplifying electric power system synthetic load model and identifying model parameters

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Embodiment Construction

[0044] The method for simplifying the comprehensive load model of the power system and identifying the model parameters proposed by the present invention includes the following steps:

[0045] (1) Simplify the comprehensive load model in the power system. Assuming that the operating condition is steady state, the active power and reactive power in the comprehensive load model of the power system are respectively P com and Q com , the active power and reactive power of the induction motor part are P com_m0 and Q com_m0 , the static part consists of resistor R com and reactance X com Composition, the stator reactance, rotor reactance and excitation reactance of the induction motor part of the comprehensive load model are respectively X S , X R and x M ; The active power and reactive power in the simplified model of power system integrated load are P 0 and Q 0 ,, the active power and reactive power of the induction motor part are P m0 and Q m0 , then according to the s...

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Abstract

The invention relates to a method for simplifying an electric power system synthetic load model and identifying model parameters, and belongs to the technical field of electric power system load stability monitoring. According to the method, the internal relationship between parameters of an induction motor is deeply analyzed, and on this basis, by converting the input-output relationship of the model, a simplified electric power system synthetic load model is provided. According to the simplified electric power system synthetic load model, possible steady-state operation states of multiple sets of simplified electric power system synthetic load models are preset, parameter identification is carried out through the least square method on the basis of a state equation of the part of the induction motor of the simplified electric power system synthetic load model, corresponding indexes are provided to reflect identification precision, and the set model with the highest precision is selected from all preset steady state conditions, and an identification result corresponding to the set of model is used as the final identification result. The method has high generalization performance and feasibility, and can accurately and quickly identify the parameters of the electric power system synthetic load model.

Description

technical field [0001] The invention relates to a method for simplifying a comprehensive load model of a power system and identifying model parameters, and belongs to the technical field of power system load stability monitoring. Background technique [0002] Load is an important part of power system, and reasonable and accurate load modeling is an important basis for load stability analysis. Currently, load modeling usually uses an integrated load model. The comprehensive load is composed of static load and dynamic load. The static load adopts constant impedance, and the dynamic load uses induction motor. Existing studies generally use electromechanical transient models of induction motors, and use global search algorithms such as genetic algorithms and optimization particle swarm optimization algorithms, and some studies use algorithms such as Volterra series identification. However, the current identification method does not fully simplify the comprehensive load model, ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 于松泰张树卿
Owner TSINGHUA UNIV
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