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Fault loss estimation method for risk assessment of transient rotor 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: 2011-02-09
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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

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Embodiment Construction

[0106] When conducting transient stability risk assessment of power system, scientific estimation of 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 uses the trajectory sensitivity technology to transform the above problem into an optimal power flow problem considering transient stability constraints to solve. Finally, the correctness and effectiveness of the method proposed in this paper are verified by systems such as IEEE-14 and New England-39 nodes.

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

[0108] Trajectory sensitivity provides rich operational information of the system at every moment of the transient process, independent of the component model [5] , in recent years, the optimal power flow (OTS) considering transient sta...

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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 grid 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 and the continuous expansion of the network scale, the uncertain factors in the system continue to increase. It is of great significance to reasonably evaluate the impact of uncertain factors on the stable operation of the system through risk analysis. [1] . The difficulty of risk analysis is how to accurately estimate the loss caused by the failure of the system after the system is unstable. The optimal stability control cost is used to approximate the system loss, which provides a feasible way to solve this problem. [1] . Reference [2] adopts a preset low-voltage load shedding strategy to carry out emergency control of the system to obtain the control cost; Reference [3] adopts the cost of generator maintenance, ...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 贾宏杰罗斌
Owner TIANJIN UNIV
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