In Part I of this work, a static voltage security region was introduced to guarantee the safety of wind farm reactive power outputs under both base conditions and N-1 contingency. In this paper, a mathematical representation of the approximate N-1 security region has further studied to provide better coordination among wind farms and help prevent cascading tripping following a single wind farm trip. Besides, the influence of active power on the security region is studied. The proposed methods are demonstrated for N-1 contingency cases in a nine-bus system. The simulations verify that the N-1 security region is a small subset of the security region under base conditions. They also illustrate the fact that if the system is simply operated below the reactive power limits, without coordination among the wind farms, the static voltage is likely to exceed its limit. A two-step optimal adjustment strategy is introduced to shift insecure operating points into the security region under N-1 contingency. Through extensive numerical studies, the effectiveness of the proposed technique is confirmed.


Electrical and Computer Engineering


Special Issue of Energies Titled Wind Turbines 2014

Keywords and Phrases

Electric Utilities; Intelligent Systems; Monte Carlo Methods; Optimization; Reactive Power; Wind Power; Cascading Tripping; Inner Point; N-1 Contingencies; Near Point; Voltage Security; Electric Power System Interconnection; Monte Carlo Simulation; N-1 Contingency; Voltage Security Region

International Standard Serial Number (ISSN)


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Article - Journal

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Final Version

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Publication Date

01 Jan 2014