Technical requirements for the dispersed power sources connected to the distribution network

Basic requirements for dispersed power sources are stipulated by a number of directives and instructions provided by the power system network operator. They contain a wide spectrum of technical conditions which must be met when such objects are connected to the distribution network. From the point of view of the power system automation, these requirements are mainly concerned with the possibilities of the power level and voltage regulation. Additionally, the behaviour of a wind farm during faults in the network and the functioning of power protection automation have to be determined. Wind farms connected to the HV distribution network should be equipped with the remote control, regulation and monitoring systems which enable following operation modes:

• operation without limitations (depending on the weather conditions),

• operation with an assumed a priori power factor and limited power generation,

• intervention operation during emergences and faults in the power system (type of intervention is defined by the operator of the distribution network),

• voltage regulator at the connection point,

• participation in the frequency regulation (this type of work is suitable for wind farms of the generating power greater than 50 MW).

During faults in HV network, when significant changes (dips) of voltage occur, wind farm cannot loose the capability for reactive power regulation and should actively work towards sustaining the voltage level in the network. It also should maintain continuous operation in the case of faults in the distribution network which cause voltage dips at the wind farm connection point, of the times over the borderline shown in Fig. 6.

Fig. 6. Borderline of voltage level conditioning continuous wind farm operation during faults in the distribution network
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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