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Cutter control measure quantification method based on system acceleration energy

A technology for system acceleration energy and control measures, applied in the field of power systems, can solve problems such as difficult sinusoidal curve fitting and inconvenient calculations

Active Publication Date: 2014-02-26
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are two problems in the "real-time analysis, real-time decision-making" control strategy of this machine-cutting quantification method based on the equal-area criterion: on the one hand, it is necessary to determine the starting and ending conditions of the area integration, so as to calculate the maximum acceleration area and maximum deceleration area
In addition, its oscillation period has also changed, so it is difficult to fit with a sinusoidal curve
It can be seen that it is not convenient to use the equal-area law to quantify the control measures, and it is urgent to study a more convenient calculation method for the cut-off quantity in engineering practice.

Method used

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  • Cutter control measure quantification method based on system acceleration energy
  • Cutter control measure quantification method based on system acceleration energy
  • Cutter control measure quantification method based on system acceleration energy

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Embodiment 1

[0066] Embodiment 1 provided by the present invention is an embodiment of a quantitative calculation method for a system acceleration energy-based cut-off control measure provided by the present invention.

[0067] Specifically, in this embodiment, the quantitative calculation of the cut-off control measure based on the system acceleration energy is carried out through the WAMS system after the failure.

[0068] In step S1, the critical machine group of the multi-machine interconnected power system after the fault is determined through the measurement information measured by the WAMS system.

[0069] In step S2, the dynamic characteristic information of the critical fleet is periodically obtained through the WAMS measurement system after the fault, and the sampling period T of the dynamic characteristic information of the contact section is synchronized with the PMU (Phasor Measurement Unit, synchronous phase angle measurement) in the WAMS measurement system. Unit) The samplin...

Embodiment 2

[0103] The second embodiment of the quantitative calculation method for the control measures of the cut-off based on the acceleration energy of the system provided by the present invention is an embodiment of the quantitative calculation method for the control measure of the cut-off when the New England 10-machine 39-node system loses stability. The Power System Analysis and Synthesis Program (PSASP) developed by the Institute uses the disturbance response data obtained by the simulation program to simulate the real-time measurement data of the wide-area measurement system. The generator adopts the classical second-order model, and the load adopts the constant impedance model. The fault condition is that bus16-bus17 has a three-phase ground short circuit, and the fault lasts for 0.20s. After that, the line is cut off, and the system becomes unstable. According to the initial power flow, the system can be divided into three regional subsystems, where the sending-end area is Are...

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Abstract

The invention provides a cutter control measure quantification method based on system acceleration energy and provides a decision basis for transient stabilization cutter control measures. The method comprises steps that: a critical cluster of a multi-machine interconnection electric power system during instability is determined; an equivalent single-machine infinite system model of the multi-machine interconnection electric power system based on real measurement information is established according to the critical cluster; acceleration energy of the system is calculated; a cutter measure quantification solution equation is established and is solved to acquire calculated values of cutter amount; classifying processing on the calculated values of cutter amount is carried out in combination with a real generator capacity according to the calculated values of cutter amount, and final real cutter amount is acquired; dynamic behavior of the system after employment of the cutter measures is continuously monitored, if the system tends to be in an instability state, next cutter amount is calculated based on newest measurement information. The method fully considers dynamic characteristics of the system, has a simple solution process and has excellent engineering application prospects.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for quantifying machine cut control measures based on system acceleration energy. Background technique [0002] Transient stability control is an important means to ensure the safe and stable operation of the power grid. When the transient power angle is unstable, the power cutoff control is usually performed on the sending end system to ensure the stability of the system. A reasonable amount of power cutoff is the key to ensure the stability of the system. Therefore, the quantitative research of machine cutting control measures has always been the focus of attention. With the increasing scale of the interconnected power grid, the transient stability control is gradually developing towards the direction of "real-time decision-making and real-time control", and the rapid quantification method is the premise of realizing "real-time control". In recent years, the development o...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 汤涌吴为孙华东
Owner STATE GRID CORP OF CHINA
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