Abstract
With the grid-connected operation of large-scale wind farms, the contradiction between supply and demand of power systems is becoming more and more prominent. The introduction of multiple types of flexible resources provides a new technical means for improving the supply–demand matching relationship of system flexibility and promoting wind power consumption. In this paper, multi-type flexible resources made up of deep peak regulation of thermal units, demand response, and energy storage were utilized to alleviate the peak regulation pressure caused by large-scale wind power integration. Based on current thermal plant deep peak regulation technology, a three-phase peak regulation cost model of thermal power generation considering the low load fatigue life loss and oil injection cost of the unit was proposed. Additionally, from the perspective of supply–demand balance of power system flexibility, the flexibility margin index of a power system containing source-load-storage flexible resources was put forward to assess the contribution from each flexibility provider to system flexibility. Moreover, an optimal dispatching model of a multi-energy power system with large-scale wind power and multi-flexible resources was constructed, aimed at the lowest total dispatching cost of the whole scheduling period. Finally, the model proposed in this paper was validated by a modified RTS96 system, and the effects of different flexibility resources and wind power capacity on the optimal scheduling results were discussed.
Highlights
As the proportion of renewable generation in the power system increases, wind power will become one of the most important pillars of power supply
In the process of operation of a power system, all adjustment methods that could cope with fluctuations and uncertainties can be flexible resources, which may be derived from the generation side, the load side, or energy storage
Before a fluctuating power supply such as wind power is connected to the power grid, the uncertainty of the power system mainly comes from load changes and unexpected disturbances caused by conventional power failure
Summary
As the proportion of renewable generation in the power system increases, wind power will become one of the most important pillars of power supply. Combining the advantages of the deep peak regulation of thermal units, energy storage, and demand response is a key element needed to improve flexible adjustment performance and the wind power consumptive capacity of systems; (2) there is no practical quantitative evaluation index for the flexibility of power systems with multi-type flexible resources of source-load-storage which can be used to quantify the adjustment ability of source-load-storage flexible resources and the flexibility of system operation. Considering the low load fatigue life loss and oil injection cost of the unit, a three-phase peaking cost model of thermal power generation was established; The flexibility margin index of power system containing the flexible resources of source-loadstorage has been proposed, which can be employed to evaluate the adjustment potential of various flexible resources and the flexibility of system operation; With the objective of minimizing the total dispatching cost, an optimal power system dispatching model, which contains multi-flexible resources such as thermal power deep peak regulation, demand response, and energy storage, was established
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