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.


Electrical and Computer Engineering


Special Issue of Energies Titled Wind Turbines 2014

Keywords and Phrases

Electric Utilities; Intelligent Systems; Monte Carlo Methods; Voltage Control; Wind Power; Boundary Components; Cascading Tripping; Computational Burden; Computational Effort; Cutting Plane Techniques; N-1 Contingencies; Voltage Security; Wind Power Integrations; Electric Power Transmission Networks; Monte Carlo Simulation; Voltage Security Region

International Standard Serial Number (ISSN)


Document Type

Article - Journal

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Final Version

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Publication Date

01 Jan 2014