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Development the Flexibility Metric Incorporating Wind Power in the Presence of Energy Storage

Increasing the uncertainty and variability in power system both in generation and demand sides is one the main challenges in power system operation. So power system flexibility plays the main role in secure and reliable power system operation. Variable generation specially wind and solar are two main sources of flexibility decrement challenge in power system On the other hand energy storage equipment helps to overcome this challenge by insertion or absorption electrical energy by sufficient capacity and ramp rate. Flexibility metrics is a good tool for power system flexibility evaluation and can help to comprise the level of flexibility of power system in different situations especially in operational planning and real time operation. In this paper a new flexibility metric is developed for power system incorporated wind farm in the presence of energy storage equipment for power system flexibility evaluation. This metric includes two main parts of energy capacity and ramp rate of energy storage each of them improves the power system flexibility. The comparison of this metric with and without the energy storage can quantify the role of this equipment and also can be used for economic analysis by the concept of flexibility value.