台灣地區的風力發電機多裝置於沿海與空曠等閃電落雷頻繁之區域，較易遭受雷擊並導致損壞，因此，本文旨於提出合宜之避雷策略，以期降低風力發電機之雷害損失。首先，建立風力發電系統之相關模型，包含塔架、控制線、避雷器、地下電纜及系統電源等。其次，建立雷擊電流模型，以模擬在風力發電機遭受雷擊時，藉由接地系統連接方式之改變，分析塔架內控制線絕緣層之電壓分佈、控制設備之電壓值，以及塔頂與控制線間之跨壓值等影響。最後，建立風場模型，以瞭解雷擊前後，對於風力發電機暫態電壓之影響。
研究過程發現，對於塔架與設備共同接地之系統，在遭受雷擊事故時，過大的接地電阻將造成風電控制系統等敏感設備之危害，同時，對於控制線路兩端絕緣層跨壓之突升，亦可能危及維護保養者之人身安全。其次，透過將風場間各風力發電機之避雷接地系統相互連接，以觀察雷擊對風場中各風力發電機變壓器繞組絕緣之影響；而模擬結果顯示，本文所提之塔架與設備個別接地，以及將風力發電機避雷接地相互連接之方法，將可有效改善風力發電機在發生雷擊事故時，其暫態電壓對於風電系統之不良影響，同時減少風力發電設備絕緣破壞現象發生。

In Taiwan, wind turbines are mostly set up along coast and wide field where they are frequently struck and damaged by lightning. For this reason, this thesis presents lightning protection strategies to reduce losses of lightning damage for wind turbines. First of all, a comprehensive wind turbine lightning protection model is established. It contains tower, control line, underground cables, and power system equivalent models. Secondary, lightning current model is established for simulating the influences by changing the connection of grounding system. The voltage distribution on dielectric insulation of control line inside the tower, the voltage of controlling equipment, and the voltage difference between tower top and control line are analyzed. Finally, a wind farm model is established to examine the influence of transient voltage under lightning.
Simulation results for a stand-alone wind turbine system show that if the grounding systems of the tower and equipment are connected together too large grounding resistance may lead to damage of the sensitive equipments of wind turbine directly. Moreover, the surge voltage of the dielectric insulation on both ends of control line might endanger the staff of maintenance. For the wind farm system, the grounding systems of arresters for various wind turbines are connected together or isolated to investigate the impact on dielectric insulation of transformer winding for wind turbine. Simulation results obtained show that the tower and equipment are grounded separately, and the ground systems of the wind turbines all joined together will be beneficial to reducing the influence of transient voltage and the dielectric breakdown of wind power equipments.

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