Frequency regulation reserve optimization of wind-PV-storage power station considering online regulation contribution

Abstract

The frequency regulation reserve setting of wind-PV-storage power stations is crucial. However, the existing grid codes set up the station reserve in a static manner, where the synchronous generator characteristics and frequency-step disturbance scenario are considered. Thus, the advantages of flexible regulation of renewable generations are wasted, resulting in excessive curtailment of wind and solar resources. In this study, a method for optimizing the frequency regulation reserve of wind PV storage power stations was developed. Moreover, a station frequency regulation model was constructed, considering the field dynamic response and the coupling between the station and system frequency dynamics. Furthermore, a method for the online evaluation of the station frequency regulation was proposed based on the benchmark governor fitting. This method helps in overcoming the capacity-based reserve static setting. Finally, an optimization model was developed, along with the proposal of the linearized solving algorithm. The field data from the JH4# station in China’s MX power grid was considered for validation. The proposed method achieves a 24.77 % increase in the station income while ensuring the system frequency stability when compared with the grid code-based method.