Abstract
The volatility and uncertainty of high-penetration renewable energy (RE) challenge the stability of the power system. To tackle this challenge, an optimal dispatch of high-penetration RE based on flexible resources (FRs) is proposed to enhance the ability of the power system to cope with uncertain disturbances. Firstly, the flexibility of a high-penetration RE integrated power system is analyzed. The flexibility margin of power supply and flexible adaptability of RE are then introduced as the evaluation indices for optimal operation. Finally, a multi-objective optimal dispatch model for power system flexibility enhancement based on FRs under the constraint of flexibility indices is proposed. The simulation results show that the proposed optimal dispatch can effectively enhance the flexibility of the power system and the penetration of RE and reduce pollutant emissions. Compared with the conventional method, the daily average emissions of CO2, SO2, and NOx with the proposed method are reduced by about 83,600 kg, 870 kg, and 370 kg, respectively, the maximum allowable volatility of net load is increased by 7.63%, and the average volatility of net load is reduced by 2.67%.
Highlights
Due to the volatility and intermittence of renewable energy (RE), large-scale integration of RE into a power system increases the volatility of the system’s net load, which causes the thermal power unit (TPU) to operate in a state of deep peak shaving and affects the economics and pollution of the power system [1,2]
This paper proposes comprehensive flexibility evaluation indices to enhance the flexibility of a high-penetration RE integrated power system
With the consideration of the proposed flexibility evaluation indices, the volatility of net load and pollution emissions are reduced through the accurate regulation of flexible resources (FRs)
Summary
Due to the volatility and intermittence of renewable energy (RE), large-scale integration of RE into a power system increases the volatility of the system’s net load, which causes the thermal power unit (TPU) to operate in a state of deep peak shaving and affects the economics and pollution of the power system [1,2]. It is necessary to develop an optimal dispatch of a high-penetration RE integrated power system to enhance the system’s flexibility [4]. In the high-penetration RE integrated system, it is difficult to effectively respond to the rapid change of the net load by relying solely on the reserve capacity, resulting in greater risks to the security of the power grid [7,8]. Reference [19] proposes a new capacity expansion model, which considers ES and policy constraints, but the balance of a high-penetration RE power system is neglected. An improved real-time dispatch model is proposed to enhance system flexibility by operational flexibility metrics that lack slope probability [20]. The flexibility of the traditional power system has been improved, there are still insufficient evaluation indices for the power system with high-penetration RE.
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