摘 要

　　本論文係分析分散式發電系統與市電系統並聯運轉時，在市電系統及分散式發電系統上可能發生之動態與穩態特性影響。在本論文中，分別探討與市電並聯運轉之四部感應機、四部太陽能發電系統經換流器與市電並聯以及發電機經整流器-換流器後與市電系統並聯之架構為研究模型，在三相平衡系統下採用交直軸等效電路模型，分別建立發電機、光伏電池、整流器、蓄電池與換流器等之模型，推導其數學模式來完成整體動態方程式，並利用特徵值來求出系統動態穩定度。在穩態方面，則分別對發電機轉速、自激電容值、市電端電壓以及太陽能發電系統之光伏電池短路電流、蓄電池電壓等量對系統特性之影響，做一詳細討論。在動態研究方面，則考慮發生故障時，可能對分散式發電系統造成的影響做評估分析。

Abstract

　　This thesis analyzes dynamic and steady-state performance of dispersed generation systems connecting to an utility grid. The studied three systems are respectively four parallel-operated grid-connected induction generators, four photovoltaic (PV) systems connected to the utility grid via inverters, and generators connected to the utility grid via rectifier-inverter modules. A d-q axis equivalent-circuit model is employed to establish the generator, rectifier, inverter, PV, and battery models to derive the complete dynamic equations of the studied system under three-phase balanced loading conditions. The eigenvalue method is employed to determine dynamic stability of the studied system. The generator’s rotor speed, excitation capacitance, grid voltage, PV’s short current, and battery voltage of the studied system under steady-state conditions are also examined. Dynamic characteristics of the studied dispersed generation systems subject to a faulted condition are explored.

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