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Energies 2014, 7(1), 420-443; doi:10.3390/en7010420
Article

A Static Voltage Security Region for Centralized Wind Power Integration—Part I: Concept and Method

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Received: 26 November 2013 / Revised: 4 January 2014 / Accepted: 17 January 2014 / Published: 22 January 2014
(This article belongs to the Special Issue Wind Turbines 2014)
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Abstract

When large wind farms are centrally integrated in a power grid, cascading tripping faults induced by voltage issues are becoming a great challenge. This paper therefore proposes a concept of static voltage security region to guarantee that the voltage will remain within operation limits under both base conditions and N-1 contingencies. For large wind farms, significant computational effort is required to calculate the exact boundary of the proposed security region. To reduce this computational burden and facilitate the overall analysis, the characteristics of the security region are first analyzed, and its boundary components are shown to be strictly convex. Approximate security regions are then proposed, which are formed by a set of linear cutting planes based on special operating points known as near points and inner points. The security region encompassed by cutting planes is a good approximation to the actual security region. The proposed procedures are demonstrated on a modified nine-bus system with two wind farms. The simulation confirmed that the cutting plane technique can provide a very good approximation to the actual security region.
Keywords: wind power; voltage security region; voltage control; Monte Carlo simulation; cascading tripping wind power; voltage security region; voltage control; Monte Carlo simulation; cascading tripping
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ding, T.; Guo, Q.; Bo, R.; Sun, H.; Zhang, B. A Static Voltage Security Region for Centralized Wind Power Integration—Part I: Concept and Method. Energies 2014, 7, 420-443.

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