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Electric power system transient state stable real-time emergency control method based on relative kinetic energy

A power system, transient stabilization technology, applied in emergency protection circuit devices, electrical components, parameter calibration/setting, etc., can solve problems such as immature technology

Active Publication Date: 2015-04-29
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, it is still in the initial stage of theoretical research, and the technology is not yet mature.

Method used

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  • Electric power system transient state stable real-time emergency control method based on relative kinetic energy
  • Electric power system transient state stable real-time emergency control method based on relative kinetic energy
  • Electric power system transient state stable real-time emergency control method based on relative kinetic energy

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Embodiment Construction

[0062] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0063] The present invention provides a real-time emergency control method for power system transient stability based on relative kinetic energy, the flow chart of which is as follows figure 1 As shown, it specifically includes the following steps:

[0064] (1) Real-time acquisition of measured quantities in the system, including rotational speed and power angle;

[0065] (2) Check whether the system is faulty through the detection system or the processor (it can also be seen from the changes in the value of the speed and power angle), if yes, proceed to step (3), otherwise return to step (1);

[0066] (3) Perform dual-machine equivalent for the system, that is, the entire system is equivalent to two units;

[0067] (4) Calculate the remaining acceleration area at each moment (depending on the measured step size, gener...

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Abstract

A real-time emergency control method of relative kinetic energy-based power system transient stability. The system transient stability is monitored in real time by using a method of judging a change trend of rotation speed difference-power-angle difference, and is used as a startup condition of emergency control. When determining that a system will lose power-angle stability, the method calculates a remaining accelerating area based on a relative kinetic energy concept in a two-machine system, and uses an equal-area criterion to calculate and control a generator tripping value. In a control decision-making process, an impact of an action delay time is considered, making a calculation result more reliable. The method overcomes defects that a running method and a fault need to be predicted during offline calculation and that there is a lack of flexibility in handling a small-probability emergency accident, has strong adaptability and flexibility, and improves a safe and stable running level of the power system.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a real-time emergency control method for transient stability of electric power systems based on relative kinetic energy. Background technique [0002] In order to meet the continuous and rapid growth of power load, the power grid is developing towards the highest voltage level and largest scale AC-DC hybrid power system. Its operation mode is becoming more and more complex and changeable, and its safe and stable operation is facing new challenges. The emergency control of the second line of defense for preventing the stability of the system from being destroyed or further expanding to cause large-scale power outages and preventing the loss of stability of the power system is of great significance. [0003] At present, the widely used transient stability control scheme is "offline decision-making, real-time matching", which is mainly aimed at the expecte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14
CPCH02H7/06H02H3/006
Inventor 顾卓远汤涌张健
Owner CHINA ELECTRIC POWER RES INST
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