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Design method for judging out-of-step separation based on in-place active/idle work variable quantity

A design method and technology of variation, applied in the direction of automatic disconnection emergency protection device, phase sequence/synchronization indication, electrical components, etc., can solve the problems of low voltage release of motor load, auxiliary machine loss of voltage trip, generator trip, etc. , to achieve the effect of mature computing technology

Inactive Publication Date: 2011-04-06
STATE GRID SICHUAN ELECTRIC POWER CO +1
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  • Claims
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Problems solved by technology

But in fact, the oscillation goes through at least two low-voltage processes in a week, especially near the center of the oscillation. The voltage is very low, close to zero, which will cause the motor load to be released at low voltage, or part of the load will be shed due to the low-voltage load shedding action, such as in a power plant. Nearby, it may also cause the auxiliary machine to lose voltage and trip, causing the generator to trip

Method used

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  • Design method for judging out-of-step separation based on in-place active/idle work variable quantity
  • Design method for judging out-of-step separation based on in-place active/idle work variable quantity

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Embodiment Construction

[0022] The following is a preferred embodiment of the present invention, including the description of the criterion of the out-of-synchronization de-sequencing device of the power system realized by the method of the present invention. Other characteristics, objects and advantages of the present invention can also be seen from the description of the embodiments and from the accompanying drawing 2 .

[0023] As shown in Figure 2, the out-of-synchronization de-sequencing device A is installed at one end of the line.

[0024] (1) The out-of-step splitting device A samples and calculates the active power P flowing in the line A and reactive power Q A , and using P A and Q A Calculate the absolute value of the phase angle θ A =atan(|Q A | / |P A |).

[0025] (2) When the phase angle θ A When changing from less than 45° to greater than 45°, judge the absolute value of active power |P A |The trend of change.

[0026] (3) If the absolute value of active power |P A |in decreas...

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Abstract

The invention discloses a design method for judging out-of-step separation based on active / reactive variants in-situ. When the mechanical accelerated power of the system exceeds the electric braking power, if the electric braking power continuously reduces while the phase angle continuously increases, the unit is further accelerated and the out-of-step occurs, thus the time is the critical out-of-step time of the system. The design method of the invention is based on principle of conservation of energy and can achieve the safe and reliable out-of-step separation control of the power system in-situ with fast action, thereby preventing power system stabilization destruction and large area blackout caused by emergent events.

Description

technical field [0001] The invention relates to an automatic control method in the electric power field, in particular to a design method for judging out-of-step splitting based on local active and reactive power variation. Background technique [0002] With the construction of the UHV power grid, the connection between the regional power grids has been greatly strengthened, and the stability characteristics have become more complex. It is urgent to study the power grid decoupling control technology in extreme emergencies. Principle When judging the out-of-step oscillation of the line, at least one oscillation period is required for judging time, which cannot fully meet the needs of power grid stability control. [0003] The traditional out-of-synchronization decoupling device usually determines the decoupling range with low voltage or impedance, out-of-synchronization oscillation occurs within the decoupling range, and decoupling occurs after N (≥ 1) oscillation cycles. Bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/18H02H3/48
Inventor 李天华邵俊松张晓明方勇杰王伟李德胜梁汉泉杨卫东庞晓燕徐泰山刘福锁张长银薛禹胜
Owner STATE GRID SICHUAN ELECTRIC POWER CO
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