Abstract
The stable electric power supply requires to maintain the system frequency within a specified band by matching the supply and demand constantly with the help of Economic load Dispatching Control (EDC) or Load Frequency Control (LFC). On the other hand, recently the penetration of renewable energy sources (RESs) such as photovoltaic generations (PVs) and wind turbines (WTs) are rapidly increasing due to the introduction of feed-in tariff (FIT) and growing environmental awareness. However, the output power generated by these RESs depends on the climatic conditions, and as such the output may not always be available when required. As a result, it would be more difficult to ensure the stable power supply by balancing the supply and demand in view of the uncertain outputs of RESs at all the time. In order to grasp the influences and to verify the effectiveness of countermeasures for various issues such as the frequency deviation caused by a large penetration of RESs, the analysis and simulation technologies for the electric power supply and demand control are becoming more important. Hence in this paper, the recent trends of these technologies are reviewed.
