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Transient-state function comprehensive index based intelligent control method for power system transient stability

A technology of transient energy function and comprehensive index, which is applied in the direction of reducing flicker of AC network, reducing/preventing power oscillation, etc. It can solve the problems of limited information, difficult to specify the control range, and difficult to realize intelligent control, etc., and achieve simple calculation , accurate results, scientific and reasonable methods

Active Publication Date: 2016-04-06
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0003] At present, in terms of improving and improving the transient stability control strategy of the interconnected grid, it is mainly based on the measurement of the power angle curve to construct the sensitivity of the generator power angle and the generator active power to adjust the generator output for regulation, and to use the power generation The optimal allocation is transformed into an optimization problem for solution, but the amount of information provided by the above methods is limited, and the control range is difficult to specify, making it difficult to achieve effective intelligent control

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  • Transient-state function comprehensive index based intelligent control method for power system transient stability
  • Transient-state function comprehensive index based intelligent control method for power system transient stability
  • Transient-state function comprehensive index based intelligent control method for power system transient stability

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[0064] by figure 1 The 10-machine 39-node system is shown as an example. Fault setting: A three-phase short circuit occurs in the system at 0s, the fault point is bus 18, the fault lasts for 0.19s, and it is state 1 at this time. figure 2 It is the proposed intelligent control strategy diagram for transient stability.

[0065] (1) Calculate the potential energy index SBI of each branch in the current state 1-determine the most vulnerable branch and transient stability

[0066] Firstly, according to the transient data of the current system, the potential energy curves of each branch in state 1 before regulation are calculated as follows: image 3 As shown, the potential energy distribution of each branch of the power grid can be obtained, and the stability index of each branch can also be calculated at the same time. Some SBI indexes are shown in Table 1, because there are SBI (branch 16-19), SBI (branch 34-20) is approximately 0, it can be seen that the current state 1 of ...

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Abstract

The invention relates to a transient-state function comprehensive index based intelligent control method for power system transient stability. The intelligent control method is characterized by comprising the following steps of calculating a stability index of each branch in the oscillation process at a current running state, and determining a weakest branch and a transient stability state of a power grid; identifying most advanced power generator set; giving out active limit power adjusted by a power generator; giving out a suggested adjustment range adjusted by the power generator; and verifying whether transient stability is achieved or not. By the intelligent control method, comprehensive estimation can be made on system transient stability from angles of network potential energy and power generator kinetic energy, transient stability estimation and vulnerable cutest selection are carried out by means of branch potential energy, a control object is distinguished according to kinetic energy slope of the power generator, the adjusted suggested adjustment range is determined according to a function relation of the branch potential index and the active power of the power generator, and an intelligent control strategy for transient stability taking an energy system as a main line is built. The intelligent control method has the advantages of scientificness, reasonableness, simple computation, an accurate result, high engineering application value and the like, and is easy to implement.

Description

technical field [0001] The invention relates to the field of power system operation and control, and relates to a power system transient stability intelligent control method based on a transient energy function comprehensive index. Background technique [0002] With the interconnection of the national power grid, the transient stability of the power system has always been one of the main issues that people care about, which seriously affects the power transmission and the safe and stable operation of the power system. When the power grid is disturbed, if the transient stability control measures cannot be effectively taken, it will seriously affect the safe operation of the power grid, and if the measures are unreasonable, the system will lose stability and other serious consequences. Therefore, if an intelligent control strategy for transient stability of the interconnected grid can be constructed, it will provide an effective way for the prevention and control of transient ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/002H02J3/24
Inventor 刘铖蔡国伟孙正龙刘旭王祯祎
Owner NORTHEAST DIANLI UNIVERSITY
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