Impact of Solar and Wind Farm Disturbance to the Stability of the Distribution Network

Renewable energy on large scale has been widely used by several countries. Examples of renewable energy on large scale are solar and wind farms. Interconnecting solar and wind farms to the distribution network is the best solution to meet consumer power needs and reduce losses during power transmission over the transmission network. However, the distribution network in the electric power system can be affected if the solar and wind farms get disturbance. The disturbance is off power plant renewable energy from the electric power system. This paper aims to find out the impact of these disturbances on the stability of the distribution network. Normally, solar and wind farms are interconnected with the distribution network. In this method, artificial disturbance in solar and wind farm is made in the form of scenarios. The first scenario, the solar farm experiences disturbance or off from the distribution network. The second scenario, the wind farm is off. The third scenario, solar farm and wind farm off from distribution network. The result is that in the first scenario when the solar farm is off from the system, the grid and wind farm are still able to meet the load power requirements and the frequency can return to its normal state for 10 seconds. In the second scenario, when the wind farm is off of the system, the grid and solar farm are still able to balance the power supply with the load power requirements and can return the frequency to its normal state for 18 seconds. In the third scenario, when the solar and wind farm are off from the system, the grid cannot meet all the load power requirements, so the frequency cannot return to its normal state. The frequency on the distribution network can only reach 94.83%. This situation is caused because the amount of power supplied by the grid is not balanced with the total load power requirements.