Abstract
High penetration of renewable energy (RE) has a challenge for power system stability such as demand/supply imbalance. Generally, load frequency control (LFC) is applied to power demand/supply balancing management. The required LFC capacity is known to be about 2 to 3% of the power systems when the PV systems are not included. However, there are no clear criteria for LFC capacity of massive PV installation conditions. Thus, this paper proposes a method to determine the optimal LFC capacity in accordance with the PV installation level. This method consists of modeling, scheduling, and simulation of the power demand. The modeling is based on the modified AGC model. The scheduling part makes a unit commitment with forecasting of PV output data. Finally, power system numerical simulation is executed with iterative calculation. The simulation results of the proposed method shows that the optimal LFC capacity has a linear relationship with the growth of PV installation capacity. The method also revealed the linear relationship of LFC capacity regarding the striction level of the frequency criteria. This result means that the required optimal LFC capacity can be calculated without complicated power system simulations when the amount of PV installed is known.
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