- 學位論文
大型電廠接地故障對其附設太陽光電發電系統之影響研究
Affections of Large Plant Ground Faults on the Affiliated Solar Photovoltaic Energy Systems
摘要
台電公司正積極推動綠色能源之發展，紛紛於各大型電廠生水池等處附設太陽光電(Photovoltaic,簡稱PV)發電系統，此將衍生不少問題，其中大型電廠發生接地故障時，對其附設之太陽光電發電系統之影響是亟待探討的問題，主要原因是大型電廠電壓高且其系統短路容量很大，一旦開關場發生接地故障時，對太陽光電發電系統造成嚴重威脅，包括對其所屬之人員、系統與設備之傷害，此均與大型電廠本身及太陽光電發電系統之接地系統有關。本研究以一個典型的大型電廠為案例，分別探討大型電廠發生接地故障時，各接地系統之電磁特性，包括地電位昇、地電位差及金屬間接觸電壓，並藉此評估對PV之人員與設備影響。文中首先應用電磁暫態分析程式之改良程式建構模型以分析不同故障位置之接地故障，經由分析結果可獲得故障電流及注入各接地網不同位置的電流，包括故障點、各電壓等級匯流排、太陽光電發電系統各Inverter等處之電流，藉由前述分析各項穩態及暫態電磁特性。最後根據這些分析結果以評估其影響，包括對人員及設備的影響。本研究相關分析所得之數據可作為進一步探討大型電廠內太陽光電系統防護措施之參考。
並列摘要
Taiwan Power Company (TPC) is developing the green-energy generation and installing the solar photovoltaic energy system (PV system) continuously above the row-water pool or other place in the large plant. However, this also produces some issues, in which the affections of ground fault in the large plant switchyard on the PV. System is imperative to be studied. During ground fault, the operation of PV system will be threatened seriously due to that large plant have high voltage level and large short circuit capacity. The PV system associated personnel will suffer damage from ground fault which is relative to the grounding systems of the large plant itself and PV system. In this thesis, the ground fault in a typical large plant is surveyed, in which the electromagnetic characteristics of each grounding system are analyzed, which include the analysis of ground potential rise (GPR), ground potential difference (GPD) and metal-to-metal touch voltage. Based on the analysis results,The affections on PV system and its personnel and equipment are evaluated. Firstly, the circuit model of the system is constructed by alternative transient program (ATP) of electromagnetic transient program(EMTP). Then, the fault currents at different locations are simulated, and the characteristics of fault currents at each grounding system can be obtained. The important location include fault point, buses of various voltage levels and Inverter of PV system. Based on the simulation results, the electromagnetic characteristics with respect to steady state and transient state can be analyzed. Finally, according to the above analysis results, the evaluations can be proposed in terms of effects on personnel and equipment. The results obtained in the paper are useful references for protective strategies PV system in the large plant.