Studies on Unit Commitment with Pumped Storage in Taiwan Considering High Penetration of Uncertain Renewables

摘要

Renewable sources of energy, including wind and solar power, can sustainably provide electricity for end-users. However, a high penetration of renewables presents operational challenges in the power system because the renewable power generation is uncertain and changes the net load profile to a "duck-curve". This paper investigates unit commitment scenarios in 2025 that arise from the new energy policy of Taiwan; in 2025, all nuclear power plants will have been decommissioned and pumped storage units will be changed to regulate the power generation from renewables. Due to the intermittence and uncertainty of renewable energy, unit commitment that is determined using the CPLEX optimizer is studied using the point-estimation method to obtain a stochastic solution. Results of simulations of the summer and winter scenarios for the Taiwan power system in 2025 with ten pumped storage units, 183 combined cycle generators, 16 coal-fired generators and 23 power purchase agreement-based generators will reveal the impact of this new energy policy on unit commitment.