Abstract: Concentrated solar power（CSP） not only provides an alternative for the large scale utilization of solar energy, but also demonstrates excellent peak shaving ability which serves as a strong support for wind power integration. However, because of its small capacity, its large scale integration would involve an extensive number of units which can bring about numerous variables and constraints to the problem. The special structure and operation characteristics different from conventional thermal units also worsen the problem. As a result, great computational burden will be introduced to power system operation analysis and research on planning with large scale integration of CSP. To solve the problem, this paper proposed a clustered CSP model based on its characteristics. In this way, the problem scale was reduced and the solving process was accelerated. The case studies based on the revised IEEE-RTS79 have verified the validity and effectiveness of the proposed method, which is with high precision and efficiency. It provides a highly efficient tool for operation analysis of power system with large scale CSP as well as its planning research.