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Calculation method of proportion of each lode component in power grid comprehensive load model

A technology of comprehensive load model and power grid load, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of calculation speed and identification accuracy need to be improved

Inactive Publication Date: 2013-04-10
TSINGHUA UNIV
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Problems solved by technology

For the online safety and stability analysis of power systems, the existing load model online identification algorithms need to be improved in terms of calculation speed and identification accuracy.

Method used

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  • Calculation method of proportion of each lode component in power grid comprehensive load model
  • Calculation method of proportion of each lode component in power grid comprehensive load model
  • Calculation method of proportion of each lode component in power grid comprehensive load model

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Embodiment Construction

[0033] The calculation method for the proportion of each load component in the comprehensive load model of the power grid proposed by the present invention, its flow chart is as follows figure 2 shown, including the following steps:

[0034] (1) Measure the bus voltage U, active power P, reactive power Q and the initial phase θ of the bus voltage of the load node of the power grid. Assume that the initial phase of the bus voltage of a balanced node in the power grid is 0 degrees, and the bus voltage of the load node of the power grid is The initial phase is equal to the phase difference between the bus voltage and the balance node;

[0035] (2) When the power grid operation reaches a steady state, the four measured values ​​of the bus voltage, active power, reactive power and the initial phase of the bus voltage of the load node of the grid are recorded as U 0 ,P 0 , Q 0 and θ 0 ;

[0036] (3) Set a threshold value of the bus voltage of the grid load node, compare the re...

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Abstract

The invention relates to a calculation method of proportion of each lode component in power grid comprehensive load model and belongs to the technical field of power grid stability control in power system. Bus voltage, initial phase of the bus voltage, active power, and reactive power of power grid load node are firstly measured when the power grid is in stable operation. The above parameters are remeasured when the power grid is in disturbance. When disturbance measurement data is accumulated to four times, eight unknowns linear algebraic equations of lode model parameters are listed according to the four measurements and motor power ratio is obtained through solving the equations and calculating. The calculation method of proportion of each lode component in power grid comprehensive load model has the advantages of being clear in physical meaning, easy to realize, accurate in results, and capable of being applied in power system lode modeling and parameter identification software system to realize rapid identification of lode dominant parameters. Analysis of security and stability and control of subsequent power system is provided with a base.

Description

technical field [0001] The invention relates to a calculation method for the proportion of each load component in a comprehensive load model of a power grid, and belongs to the technical field of power grid stability control of a power system. Background technique [0002] At present, power system digital simulation has become the main tool for power system design, planning and operation. The accuracy of simulation results has an important impact on the safe, reliable and economical operation of power system. Whether the mathematical model of each component of the power system is accurate or not directly affects the simulation results and the decision-making scheme based on the simulation results. Different from single equipment such as generators, speed control systems, excitation systems, transformers and transmission lines, the power load is composed of a large number of electrical equipment with different forms and capacities, as well as power transmission and distributi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 袁志昌陆超于松泰
Owner TSINGHUA UNIV
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