全球的能源危機和環境問題越來越嚴重，因此人們越來越關注分散式發電和微電網技術，這些技術有助於發展再生能源，推動社會邁向低碳化。未來的電力系統需要減少對化石燃料的依賴，並加大再生能源的使用比例。然而，當分散式電源容量增長到一定比例時，它們通過變流器等電力電子設備接入主電網，幾乎沒有慣性，這可能會對主電網的穩定性造成威脅。為了保證微電網的運轉安全和穩定性，需要有效地整合微電網電力控制策略和相關能源調度機制。如果成功實現這樣的整合，將大大提高微電網的運轉安全性和穩定性，並促進再生能源的發展。本計畫主要目標為(1)建立微電網孤島運轉架構模型；(2)開發三相功率調節系統、柴油機、與再生能源等3 種電源之併聯技術，使再生能源併接點電壓變動率在5%以內；(3)開發三相功率調節系統主動及被動孤島偵測、及模式切換技術，當柴油機關閉後，三相功率調節系統維持負載電壓變動率在5%以內；(4)開發微電網孤島運轉模式下，三相功率調節系統之快速偵測電網頻率技術、及調頻演算法，並維持電池SOC 在一合理範圍。此外，本計畫將依據核能所提供之微電網系統為基礎，建立相關電網模型，並透過模擬軟體探討儲能系統、柴油機、與再生能源在不同運作模式與情境之調控策略以維護微電網系統之穩定性。 ;Since the global energy crisis and environmental issues are becoming increasingly severe, the decentralized power generation and microgrid technologies have drawn much attention in recent years. These technologies are helpful for developing renewable energy and promoting society's transition to low-carbon environment. The future power system needs to reduce its reliance on fossil fuels and increase the proportion of renewable energy usage. However, when the capacity of distributed power sources grows to a certain proportion and connected to the main grid through power electronic equipment such as inverters, little inertia characteristics of these devices may lead to a threat to the stability of the main grid. To ensure the safe and stable operation of microgrids, it is necessary to effectively integrate microgrid power control strategies and related energy scheduling mechanisms. If this integration can be achieved successfully, it will greatly improve the operational safety and stability of microgrids and promote the development of renewable energy. The main objectives of this project are to: (1) establish a microgrid islanding operation framework model; (2) develop parallel-connection control strategy for three-phase power conditioning systems, diesel generators, and renewable energy, to ensure that the voltage fluctuation rate at the connection point of renewable energy is within 5%; (3) develop active and passive islanding detection and mode switching technologies for the three-phase power conditioning system. When the diesel generator is turned off, the three-phase power conditioning system can maintain the load voltage fluctuation rate within 5%; (4) develop fast detection technology of grid frequency and frequency regulation algorithm for the three-phase power conditioning system in microgrid islanding operation mode, and maintain the SOC of battery within a reasonable range. In addition, this project would establish relevant grid models based on the microgrid system provided by Institute of Nuclear Energy Research and perform the simulation to explore the control strategies of energy storage systems, diesel generators, and renewable energy under different operating modes and scenarios to maintain the stability of the microgrid system.
