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With the increasing proportion of variable renewable energy which ownsfluctuation characteristics and the promotion of the Clean Heating policy, theseasonal energy imbalance of the system has been more and more challenging.There is a lack of effective means to mitigate this challenge under thebackground of gradual compression of the traditional thermal unit construction.Concentrating solar power (CSP) is a promising technology to replace thermalunits by integrating emergency boilers to cope with extreme weather, and canmeet long-time energy balance as a seasonal peak regulation source. In thispaper, we propose a long-term high-resolution expansion planning model of theenergy system under high renewable penetration which integrates CSP technologyfor seasonal energy balance. With the projection to 2050, by taking the energysystem in Xinjiang province which is a typical area of the Clean Heatingproject with rich irradiance as a case study, it shows that the optimaldeployment of CSP and electric boiler (EB) can reduce the cost, peak-valleydifference of net load and renewable curtailment by 8.73%, 19.72% and 58.24%respectively at 65% renewable penetration compared to the base scenario.

Capacity Expansion of High Renewable Penetrated Energy Systems Considering Concentrating Solar Power for Seasonal Energy Balance