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Additional emergency control method for security and stability of large power grid

An emergency control, safe and stable technology, applied in the direction of single-network parallel feeding arrangement, electrical components, circuit devices, etc., to achieve the effect of improving analysis efficiency, reducing the number and data transmission requirements, and reducing the possibility of misjudgment

Inactive Publication Date: 2014-03-26
TIANJIN UNIV +3
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Problems solved by technology

However, additional emergency control schemes with the ability to deal with these two mismatches have not been reported yet.

Method used

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  • Additional emergency control method for security and stability of large power grid
  • Additional emergency control method for security and stability of large power grid
  • Additional emergency control method for security and stability of large power grid

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] In order to make it possible for the regional power grid to implement additional control in the event of a power system failure and improve the transient stability of the power system, an embodiment of the present invention provides an additional emergency control method for the safety and stability of a large power grid, see figure 2 with image 3 , in the process of large-scale power system failure, the method uses the regional projected energy function method to realize the addition of emergency control in the decision-making of safety and stability control, which makes it possible for the regional power grid to achieve additional control in the event of a power system failure, and improves the efficiency of power system anal...

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Abstract

The invention discloses an additional emergency control method for security and stability of a large power grid. During the large-scale power system fault process, additional emergency control in security and stability control decision is realized by a regional projection energy function method, thus making additional control of a regional power grid possible when a power system breaks down and raising power system analysis efficiency and security of the power system. According to the method, a multidimensional generator angle system is projected to a rotary one-dimensional axis system, a projection kinetic energy curve which represents motion of the system generator is extracted, and the minimum projection kinetic energy capable of representing instability degree of the power system is calculated, thus providing an important basis for emergency control of the power system. By the method, false fault continuous trajectory integration process of a previous mixed algorithm is avoided; stable level and safety margin of transient stability of various sampling states can be quantitatively provided; and the requirement on real-time performance of power system information is satisfied.

Description

technical field [0001] The invention relates to the field of transient stability analysis in the safety and stability control of a large power grid in a power system, and the field of stability control decision-making in a fault state, in particular to an additional emergency control method for the safety and stability of a large power grid. Background technique [0002] When a large disturbance such as a three-phase short-circuit fault occurs in the transmission line of the power system, corresponding emergency control needs to be adopted to ensure the synchronous operation of the power angles between the various generator sets, that is, to ensure the power angle transient stability of the power system. As an emergency control measure that can effectively improve power system power angle transient stability, machine cut control has become a hot research direction and has been widely used. The cut-off control strategy can be calculated by various online transient stability a...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
Inventor 房大中孔祥玉赵帅吴丽华王青李晓珺马世英
Owner TIANJIN UNIV
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