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Formulation method of temporary stability control strategy for interconnected power grid based on interval tie line measurement

A technology for interconnecting power grids and control strategies, applied in AC network circuits, AC network flicker reduction, electrical components, etc., can solve problems such as poor adaptability, and achieve the effects of less measurement, less calculation, and strong pertinence.

Inactive Publication Date: 2017-08-25
CHINA SOUTHERN POWER GRID COMPANY
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of conventional offline simulation-based transient stability control methods based on event identification and poor adaptability

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  • Formulation method of temporary stability control strategy for interconnected power grid based on interval tie line measurement
  • Formulation method of temporary stability control strategy for interconnected power grid based on interval tie line measurement
  • Formulation method of temporary stability control strategy for interconnected power grid based on interval tie line measurement

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] The disturbance of a multi-machine system usually presents a two-machine instability mode, ignoring the Brownian motion within the cluster that has little effect on the system out-of-step, and can be simplified to a two-machine equivalent model, as shown in figure 2 As shown, the equivalent potentials of the two machines are respectively and C is the system oscillation center. according to image 3The derivation of the variable relationship shows that in the non-fault state of the system, the relative power angle of the two groups C (t) has the following functional relationship:

[0043]

[0044] In the actual system, when the relative power angle δ of the two generator groups increases after the fault, the voltage phase angle difference between the two equivalent systems will increase, which will cause the node voltage amplitu...

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Abstract

The invention provides a method for making interconnected network transient stability emergency control strategies based on inter-region tie line measurement. The method comprises the following steps that 1, an off-line control strategy is made, tie lines among important regions are recorded, and the emergency control strategies for all regions of an interconnected network are made by means of fault setting; 2, relative power angles among the regions are calculated, in the actual operation process of the interconnected network, a PMU is used for collecting real-time voltage values of the tie lines of all the regions, and the relative power angle between every two regions is calculated; 3, the region where a unit disturbed most severely is located is judged, and according to real-time information of the relative power angles among the regions, contrastive analysis is carried out to determine the position where the unit disturbed most severely in the interconnected network is located; 4, emergency generator tripping control is implemented, and according to the area where the unit disturbed most severely is located, the specific off-line generator tripping control strategy is executed to prevent transient state stability loss of the system. The method has the advantages that the needed measurement amount is small, the calculation amount is small, and the method is suitable for the large region interconnected network and high in pertinence.

Description

technical field [0001] The invention relates to the technical field of power system stability control, in particular to a method for formulating a temporary stability control strategy for an interconnected power grid based on inter-area tie-line measurement, which is applicable to a power grid with a wide-area measurement system (WAMS). Background technique [0002] With the wide application of Wide Area Measurement System (WAMS) in power system, it is possible to realize the transient stability control of power system based on actual measurement. [0003] Document 1 "Power System Safety and Stability Control" (China Electric Power Press, 2000, p. 8) shows that: traditional emergency control of transient stability is mostly based on offline simulation, and realizes online fast matching through established control strategies. The method relies heavily on the accuracy of offline simulations. In order to achieve better control purposes, Document 2 "Online Generation of Strateg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J3/001H02J3/002Y02E60/00
Inventor 徐光虎张勇邓晖赵晋权白杨梅勇刘春晓张建新任祖怡
Owner CHINA SOUTHERN POWER GRID COMPANY
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