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| Operation Optimization Considering Unit Recovery Effect when Concentrating Solar Power Station Acts as Black-Start Power Source |
| Meng Rongtao1, Li Shaoyan1, Gu Xueping1, Liu Yan1, Sun Yongzhao2 |
1. School of Electrical & Electronic Engineering North China Electric Power University Baoding 071003 China;;
2. Xingtai Power Supply Branch of State Grid Hebei Electric Power Co. Ltd Xingtai 054001 China |
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Abstract Concentrating solar power (CSP) is a renewable energy power generation technology that integrates heat storage and electricity generation. CSP power station is equipped with large capacity long-term energy storage device, which can realize energy time shift. In some areas that lack traditional black-start power source but have abundant lighting resources, CSP power station will become an ideal black-start power source. However, the operation mode of increasing the output power of CSP power station by absorbing excess light energy will reduce the reliability of system power supply capacity recovery, and is not suitable for power system recovery scenarios. Therefore, the operation optimization of CSP power station that participates in the power system unit recovery as a black-start power source is studied in the paper.
The number of steps required for the output power of grid connected units to climb to the minimum technical output is used as a representation of unit recovery effect, and a CSP power station operation optimization method considering unit recovery effect is proposed in the paper. Firstly, considering the thermal storage level requirement of CSP power station as a black-start power source and the coordination relationship between the output power of CSP power station and the climbing output of grid connected units, a bi-level optimization model of CSP power station supporting power system unit recovery is established; Then, a bi-level optimization solution framework is developed for the model. The outer level is the power system unit recovery model to obtain the power system unit recovery information and the power output of the CSP power station; The inner level is the CSP power station operation optimization model that takes into account the unit recovery effect to solve the operation status of the CSP power station. Finally, the proposed method is verified in the improved IEEE39 bus system with CSP power station.
The results indicate that the method can fully utilize the flexibility of CSP power station and effectively support the recovery process of power system units. Setting power output thresholds for CSP power station during DNI sufficient period can reduce the number of time steps required to increase the output of some grid connected units to the minimum technical output. It can improve the reliability of system power supply capacity recovery and increase the comprehensive effect of black-start operation of CSP power station.
The following conclusions can be drawn from the results analysis: The thermal storage system (TES) is an important component of CSP power station to achieve energy time shift and serve as a black-start power source. The CSP power station can improve its ability to serve the emergency recovery of the power system by setting a reasonable lower limit for heat storage. The TES can enable CSP power station to quickly self-start and provide sufficient electrical power support for the initial recovery of the power system. The energy storage capacity configuration of the TES has a significant impact on the climbing of grid connected units, and improving the energy storage capacity configuration can effectively reduce the amount of abandoned light energy during the power system recovery period.
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Received: 18 January 2023
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2023, Vol. 38 
