微渦輪發電機運轉模式轉換之動態模擬

Dynamic Simulations for Operation Mode Transfer of a Micro-Turbine Generator

微渦輪發電機組具有很多凌駕傳統同步發電機組之優點，例如可使用各式各樣的燃料（如厭氧沼氣），因此被認為是最可能成功的綠色能源之一。它有三種運轉模式：孤島、電網並聯及多機模式，為了能兼具此三種模式之運轉能力，機組以P-f下垂模式控制是較佳的選擇，本文即對這種類型的機組作運轉模式轉換之動態模擬分析，結果顯示，單一機組由孤島模式轉換為電網並聯模式時，會對機組產生非常大的暫態功率擾動，而兩部機組同時併聯電網時，對機組造成之衝擊更大，衝擊程度不遜於傳統同步發電機組遭受三相接地故障之狀況。

The micro-turbine generator unit is superior to the traditional synchronous generator unit in many aspects; for example, a variety of fuels (e.g. anaerobic methane) may be used. So it is deemed one of the most promising green power sources. Three modes of operation are available for the unit: island, grid-connected and multi-machine modes. To be able to operate in all three modes, it's a better choice for the unit to adopt the P-f droop mode of control. For a unit with such a control mode, dynamic simulation analyses for operation mode transfer are made in this paper. It is shown that significant transient power disturbance will be induced when the unit is transferred from the island mode to the grid-connected mode. When two units simultaneously connect to a grid, the impact on both units will be even more serious. The degree of impact is not less than the impact on a traditional synchronous generator unit that is subjected to a three-phase-to-ground fault.