Microgrid analysis without synchronous generation

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Dr. Vokony István
Department of Electric Power Engineering

In the past decades, environmental protection has gradually become one of the most important issues in everyday life. Partly due to this, the technologies utilizing renewable energy sources have undergone tremendous advancement . Today, one of the main development directions of electric power generation is the establishment of such power plants. These energy producers have many advantages, but their degree of expansion has shown their shadow side. In contrast to traditional power plants using fossil fuels, renewable energy generating units do not have a rotating mass. This property can cause significant stability problems. As a result, an exciting field of research has emerged in the discipline. In the long term, the main objective is to implement the Smart grid concept. In this structure, as an evolutionary step, the Microgrid concept is introduced. The point is that distributed energy producers and consumers together form an independently controllable network component. If we supply energy only with renewable energy sources, we talk about Microgrid without rotating mass. However, in order to operate these units safely, we need to find many solutions to the stability problem.

During my work, I gained insight into how far the results were achieved in this area. I searched for the operation and problems of existing Microgrids, mainly through foreign examples. With this knowledge, I tried to introduce the familiar problems through a Microgrid model. I used the German DIgSILENT's PowerFactory program. I studied the simplified network model of the Liveable Future park, Fót. This facility was created to show that a small microgrid could operate with pure renewable energy. Although it does not currently operate in islanding mode, it often happens that it generates its own consumption and even feeds back to the network to which it is connected. So, it can be considered Microgrid. I examined the static and dynamic properties of the network, based on which I created suggestions for possible development directions. I have summarized the above-mentioned researches, studies and calculations in my work.


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