Application Of Dgs For Local Network Stability

1049 WordsDec 18, 20155 Pages
Introduction: Due to increased concern on energy crisis and environmental issues, power industry is shifting their power production from conventional power sources to renewable energy sources, and is incorporating it into the grid utility in the form of distributed generations (DGs). The application of DGs can enhance reliability and stability of the local network, and can reach benefit to the supplier by reducing system losses and investment on a new transmission line due to increased power consumption [1]. Power generation in the form of DGs for local and grid utility can create issues as many as it may solve. Therefore, a microgrid concept is evolved to coordinate among sources, loads, and energy storage devices for maintaining…show more content…
Inverters are able to supply controlled voltage and frequency depending on the control algorithms [3]. The characteristics of inverters are significantly different from the conventional generators; therefore, specific control algorithms are required for a stable microgrid operation [4, 5]. There are a number of publications on droop based control for facilitating high reliability and avoiding complexity of a supervisory control system [6, 12]. The droop based control algorithms are popular due to their coordination capability among various power rating units together with flexibility and reliability. The concept of droop based power control is valid for the both high voltage (HV) transmission line and low voltage (LV) distribution line, although it has some limitations. Problem formulation: To achieve consumer satisfaction in power supply and harness renewable energy, microgrids design and control are essential issues for reliable operation. As the characteristics of the distribution network and high volume power electronics penetration into the network are significantly different from the conventional power system, several issues are raised. Some of the issues, which are a promised field for future research, are described shortly below: Distribution network: In a LV distribution network, the well-known P/f droop control requires much more effort than the P/V droop because predominated resistive network that naturally connects active power with
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