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

A power system, transient stabilization technology, applied in the direction of power network operating system integration, information technology support systems, emergency protection circuit devices, etc., can solve problems such as immature technology

Active Publication Date: 2013-06-05
CHINA ELECTRIC POWER RES INST +1
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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

The invention discloses an electric power system transient state stable real-time emergency control method based on relative kinetic energy. By means of the method of judging rotative speed difference-power angle difference variation tendency, the transient state stability of the system is monitored in real time to serve as a start-up condition of emergency control. When the fact that the system loses the power angle stability is judged, a remaining accelerating area is calculated based on the relative kinetic energy in a two-machine system, and a generator tripping value is calculated and controlled through the equal-area criterion. During the control decision process, the action delay time is taken into consideration, and the calculation results are enabled to be more reliable. The electric power system transient state stable real-time emergency control method based on the relative kinetic energy overcomes the defects that when an offline calculation is conducted, operation modes and obstructions need to be anticipated, and the flexibility is insufficient when a small probability accident is handled, and can be complementary to a security and stability control system, a new defense line is built to prevent the system from deteriorating further even causing a big blackout accident, the power grid safety and stability defense system is enriched, and the safety and stability operation level of the electric power system is improved.

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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IPC IPC(8): H02J3/14
CPCY04S20/222Y02B70/3225H02J3/00H02J3/14H02H7/06H02H3/006
Inventor 顾卓远汤涌张健
Owner CHINA ELECTRIC POWER RES INST
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