Interaction of dispersed power generation sources DPGS with the power grid

There are two main elements determining the character of work of the so-called dispersed generation objects with the power grid. They are the type of the generator and the way of connection.

In the case of using asynchronous generators, only parallel "cooperation" with the power system is possible. This is due to the fact that reactive power is taken from the system for magnetization. When the synchronous generator is used or the generator is connected by the power converter, both parallel or autonomous (in the power island) work is possible. The level of generating power and the quality of energy have to be taken into consideration when dispersed power sources are to be connected to the distribution network. In regard to wind farms, it should be emphasized that they are mainly connected to the HV distribution

1 The way of connection and power grid configuration differs in many countries. Sample configurations are taken from the Polish Power Grid but can be easily adapted to the specific conditions in the particular countries.

network for the reason of their relatively high generating power and not the best quality of energy. This connection is usually made by the HV to MV transformer. It couples an internal wind farm electrical network (on the MV level) with the HV distribution network. The internal wind farm network consists of cable MV lines working in the trunk configuration connecting individual wind turbines with the coupling HV/MV transformer. Fig. 1 shows a sample structure of the internal wind farm network.

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G12 TB12

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G18 TB18 5

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G22 TB22

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Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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