Abstract
Concentrating solar power (CSP) station is counted as a promising flexible power supply when the net load power curve is duck-shaped in high photovoltaic (PV) penetration power system, which may lead to the serious phenomenon of PV curtailment and a large-capacity power shortage. This paper presents a mitigation strategy that replaces thermal power station with CSP station to participate in the optimal operation of power system for solving the duck-shaped net load power curve problem. The proposed strategy utilizes the dispatchability of thermal storage system (TSS) and the fast output regulation of unit in the CSP station. Simultaneously, considering the operation constraints of CSP station and network security constraints of the system, an optimization model is developed to minimize the overall cost including operation and penalty. The results obtained by nonlinear optimization function demonstrate that the replacement of concentrating solar power (CSP) station contributes to reducing the PV curtailment and lost load, while increasing the available equivalent slope for power balance. Thus, the proposed mitigation strategy can promote the penetration of PV generation and improve the flexibility of power system.
Highlights
Photovoltaic (PV) power generation is the mainstream of solar power generation due to the reduction of PV modules’ raw material cost and policy support [1,2,3]
Its variation trend does not match with the typical daily load curve with double peak in terms of time, resulting in the net load curve resembling duck silhouette that is known as duck curve [5]
thermal power stations (TPS) with Concentrating solar power (CSP) station to participate in power system optimization
Summary
Photovoltaic (PV) power generation is the mainstream of solar power generation due to the reduction of PV modules’ raw material cost and policy support [1,2,3]. Extensive researches on the modeling and application of CSP generation technology have been done, the regulation capability of which is considered to provide a beneficial support function in the future high renewable energy penetrated power system [23,24]. Based on the modeling of steady-state difference equations, its time scale can only reach the hour level, which is suitable for developing the economic optimal dispatching strategies of the CSP station participating in the power system operation [26]. This paper develops an optimization model of the power system including the CSP stations considering its operation modes, exploiting the TSS’s dispatch-ability for accommodating surplus solar energy during the midday and utilizing the unit’s fast output regulation for providing sufficient ramp rate during the sunset.
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