- 學位論文
大型離岸風場長距離海底電纜之測距電驛保護區域規劃
Protection Zone Planning of Distance Relay for the Long Submarine Cables of Large Offshore Wind Farm
摘要
本論文主要探討大型離岸風場鋪設長距離海底電纜測距電驛保護區域規劃，以未來台澎海底電纜鋪設完成後之澎湖大型離岸風場為例進行規劃，其中風機類型選用Type C雙饋式感應發電機，並使用PSS/E電力系統模擬軟體建置海底電纜模型，對裝設在海纜的測距電驛定義出三個保護區域，針對離岸風場於不同運轉情況下，模擬在不同保護區域發生三相短路故障之特性，並檢討測距電驛是否能有效保護系統，其中包括探討傳統保護區域規劃之缺失，及提出改善的規劃。研究結果顯示傳統四邊形測距電驛無法提供充分有效保護系統，主要原因是忽略了電纜電容效應及風場運轉變化的影響。因此，本文考慮海底電纜之電容效應來對保護區域做出規劃，發展出一種考慮海纜電容效應及風場運轉變化之新型四邊形測距電驛保護區域規劃，經由PSS/E模擬結果得知所提的四邊形測距電驛保護區間之規劃，於不同運轉情況下在三個保護區域發生三相短路故障時相較於傳統四邊形測距電驛更可有效保護海底電纜系統，可供風場長距離電纜保護協調規劃之參考。
並列摘要
This thesis is to study the protection zone planning of distance relays for long submarine cables of large offshore wind farm. A case study based on Tai-Peng submarine cables of Peng-Hu offshore wind farm with type-C double-fed induction wind generators is presented. A software package namely PSS/E is used for the modeling and simulation. Three protection zones are defined for submarine cable distance relays and the three phase short circuit (3ΦSC) fault characteristics of different protection zones are simulated under different wind farm operation situations. The availabilities of distance relays are surveyed including to find the defects of conventional planning and to proposed improved planning of protection zones. The study results show that the conventional quadrilateral distance relay can not provide sufficient protection for long submarine cables because of neglecting the effects of cable capacitances and the variations of wind farm operation. Therefore, a novel quadrilateral protection zone for distance relay is panned considering the effects of cable capacitances and the variations of wind farm operation. The availabilities of proposed planning had been certified by PSS/E simulation, which is also a good reference for the planning of long cable protection coordination.