Method and system for determining migration law of oscillation center of power system

A power system and oscillation center technology, which is applied in the field of determining the migration law of the oscillation center of the power system, can solve the problem that the position of the oscillation center of the power system cannot be determined, and achieves the effect of ensuring safety and stability

Inactive Publication Date: 2018-08-14
YUNNAN POWER GRID
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Problems solved by technology

[0005] This application provides a method and system for determining the migration rule of the power system oscillation center, which solves the problem in the prior art that the position of the power system oscillation center cannot be determined, which leads to the normal operation of the power system

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  • Method and system for determining migration law of oscillation center of power system
  • Method and system for determining migration law of oscillation center of power system
  • Method and system for determining migration law of oscillation center of power system

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Embodiment Construction

[0021] The application will be described in detail below in conjunction with the accompanying drawings.

[0022] see figure 1 A schematic flow chart of a method for determining the migration law of the power system oscillation center provided by this application, as shown in figure 1 As shown, the method includes:

[0023] S101, the three generating sets in the power system are equivalent to a two-machine system with three central points as the head end and any power source as the end.

[0024] Such as figure 2 Shown is a schematic diagram of an equivalent three-machine system model. Based on the superposition theorem and the substitution theorem, the voltage at the center point of the equivalent three-machine system corresponding to the three generating units in the power system is used as a virtual power supply; the center point of the equivalent three-machine system is taken as the head end, and the power supply of any generator set is The end of the two-machine system...

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Abstract

The embodiment of the invention discloses a method and system for determining a migration law of an oscillation center of a power system. The method comprises the following steps: making three generator sets in the power system be equivalent to three center points as to serve as head ends, wherein any power source is a two-machine system of the tail end; obtaining the lowest point position of a line voltage of the two-machine system, wherein the lowest point position of the line voltage of the system is the position of the oscillation center; and simulating the power system according to the lowest point of the line voltage of the two-machine system and system parameters in the power system to obtain the migration law of the oscillation center. According to the method and system disclosed by the invention, the position of the oscillation center, the power supply potential frequency, the potential amplitude ratio, the line impedance and other system parameters are considered, and meanwhile, the influence of the initial phase angle change of the power supply potential corresponding to the system operation mode before the out-of-step oscillation on the migration principle of the oscillation center of the system is mainly analyzed. The method and system can be adapted to guiding the positioning of the oscillation center, the configuration of an out-of-step disengagement device and parameter setting under a multi-frequency out-of-step scenae of the power grid to ensure the safety and stability of the power system.

Description

technical field [0001] The present application relates to the technical field of electric power system, and in particular to a method and system for determining the migration rule of the oscillation center of the electric power system. Background technique [0002] When the power system suffers from severe faults, the system may lose power angle stability and appear out-of-step oscillation. In order to prevent further expansion of the accident, it is necessary to configure an out-of-synchronization disassembly device. In an out-of-synchronization cycle, the position corresponding to the minimum voltage value at each moment on the line is called the oscillation center at that moment, and the oscillation center will continuously migrate on the line. Where the oscillation center is located, the oscillation amplitude of the voltage is the most severe, and the out-of-step center is the point where the voltage amplitude is zero during an oscillation. After the instability, gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 肖友强倪航鹏司大军林涛陈义宣王训哲
Owner YUNNAN POWER GRID
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