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| An Analytic Method for Power System Transient Stability Margin Considering Protection Information |
| Liu Jiuliang1, Wang Tong1, Zhu Shaoxuan1, Wang Zengping1, Tang Junci2 |
1. State Key Laboratory for Alternate Electrical Power System with Renewable Energy SourcesNorth China Electric Power University Beijing 102206 China;
2. State Grid Liaoning Electric Power Supply Co. Ltd Shenyang 110006 China |
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Abstract The transient stability margin of power system is closely related to the fault factors. The protection information includes effective information such as fault type, fault location and fault duration. This paper proposes an analytical method for calculating transient stability margin considering protection information. Firstly, the additional impedance of unbalanced fault is calculated, and the simplified model of multi-machine system network with additional impedance is established. Then, the rotor motion equation is equivalent to the one-machine infinite-bus system, and the piecewise models of generator aggregate power angles are further put forward. On this basis, the analytical expression of transient stability margin is derived. The transient stability margin of power system after fault can be quickly calculated by the protection information obtained online. And the effects of fault location and fault duration on the stability margin under unbalanced fault are analyzed by calculating the partial derivative of the stability margin expression. Finally, the simulations are carried out in the four-machine two-area system and the New England system, respectively. The accuracy and effectiveness of the proposed method are verified by the simulation results.
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Received: 28 January 2019
Published: 12 February 2020
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2020, Vol. 35 
