Evaluation, Calibration, and Application of Probabilistic 100-m Wind Speed Forecasts Produced by the WRF Ensemble Prediction System in Taiwan

Abstract The use of renewable energy is on the rise; however, it brings more challenges for grid operations and unit scheduling due to the intermittent nature and limitations in predicting renewable power generation. High-quality meteorological forecasts play a critical role in the effective application and management of renewable energy resources. This study evaluates the quality and economic benefits of probabilistic forecasts for 100-m wind speeds from the Weather Research and Forecasting Model ensemble prediction system (WEPS). A multiple linear regression (MLR) method for calibration is also used to improve forecast quality. Additionally, this study explores the application of probabilistic hub-height wind speed forecasts in conjunction with an economic value analysis to determine whether wind turbines should be shut down during typhoon periods. The findings reveal that the forecast in the central offshore region of Taiwan exhibits the highest reliability and discrimination ability compared to those in the northern and southern regions. Additionally, employing the MLR calibration method significantly improved the reliability and discrimination ability of the probabilistic forecasts compared to the raw forecasts. Furthermore, during the typhoon seasons, almost all users, regardless of their cost–loss ratio, can benefit from basing their decisions on WEPS forecasts compared to using a single deterministic forecast. Importantly, decision-makers can benefit more from probabilistic forecasts than the ensemble mean forecasts when both are derived from the same ensemble prediction system, since the former incorporates forecast uncertainty. Significance Statement High-quality meteorological forecasts significantly influence the efficient utilization and management of renewable energy resources. Therefore, this study uses a simple yet effective approach to correct systematic bias in probabilistic wind speed forecasts over Taiwan, aiming to provide decision-makers with more reliable forecasts for hub-height wind speeds. Given that strong winds during typhoon periods pose safety concerns for wind turbine operation, we use an economic value analysis to assist turbine operators in deciding whether to shut down wind turbines. Furthermore, our research demonstrates that ensemble probabilistic forecasts can yield greater economic benefits for decision-makers when compared to the commonly used ensemble mean forecasts.