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Fault loss estimation method for risk assessment of transient power angle stability

A technology for transient power angle stabilization and risk assessment, applied to AC network circuits, electrical components, circuit devices, etc.

Active Publication Date: 2013-02-06
TIANJIN UNIV
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  • Claims
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Problems solved by technology

The above methods all need to preset control strategies for faults, and there will be certain limitations in practical application.

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  • Fault loss estimation method for risk assessment of transient power angle stability
  • Fault loss estimation method for risk assessment of transient power angle stability
  • Fault loss estimation method for risk assessment of transient power angle stability

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Embodiment Construction

[0106] In the risk assessment of power system transient stability, scientifically estimating the system losses caused by faults is the core issue. The invention regards the loss caused by the fault as the minimum control cost required to transform the system from an unstable state to a stable state, and transforms the above problem into an optimal power flow problem considering transient stability constraints by means of trajectory sensitivity technology to realize the solution. Finally, the correctness and effectiveness of the method proposed in this paper are verified by using IEEE-14, New England-39 nodes and other systems.

[0107] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0108] Trajectory sensitivity can provide rich operating information of the system at every moment in the transient process, and is not limited by the component model [5] , in recent years considering the optimal powe...

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Abstract

The invention relates to fault loss estimation of a power network and provides a practical and effective fault loss estimation method for the risk assessment of transient rotor angle stability. In the technical scheme adopted by the invention, the fault loss estimation method for the risk assessment of the transient rotor angle stability comprises the following steps of: performing the ordinary power flow calculation to obtain the initial condition; performing transient time domain simulation and calculating trace sensitivity; if instability is determined, resolving a transient stability minimum control cost model; and if the convergence conditions that the absolute value of delta PL is less than epsilon and that the absolute value of delta Pg is less than epsilon are not met, repeating the previous steps. The method is mainly applied to the fault loss estimation and management of the power network.

Description

technical field [0001] The invention relates to power network fault loss estimation, in particular to a fault loss estimation method for transient power angle stability risk assessment. Background technique [0002] With the development of my country's power system, the scale of networking continues to expand, and the uncertain factors in the system continue to increase. Through risk analysis, it is of great significance to reasonably evaluate the impact of uncertain factors on the stable operation of the system. [1] . The difficulty of risk analysis is how to accurately estimate the loss caused by the system instability caused by the fault. Using the optimal stability control cost to approximate the system loss provides a feasible way to solve this problem. [1] . Literature [2] uses a pre-set low-voltage load shedding strategy to control the system urgently to obtain control costs; Literature [3] uses generator maintenance, start-up and output adjustment costs and load em...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 贾宏杰刘哲
Owner TIANJIN UNIV
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