Abstract
Large-scale wind power farms in China are suffering from large amounts of curtailed wind power in the conventional dispatching mode. Energy-intensive loads have great potential in providing service regulation to help consume the curtailed wind power. However, constrained by technical limitations, the regulating power of energy-intensive loads cannot fully follow the fluctuating wind power. This would result in insufficient utilization of the regulation capability of energy-intensive loads, which limits the promotion in consumption of curtailed wind power brought by load-source coordination. With this concern, a brand new method for further consuming the curtailed wind power, which involves using coal-fueled units to provide ancillary regulation for the coordination of energy-intensive loads and wind power is presented, and a corresponding bi-level coordinative model is also established. The first level of optimization is intended to maximize the consumption of curtailed wind power with minimum ancillary regulation energy. The second level of optimization is to allocate the ancillary regulating power with minimum regulation cost. Wind power consumption was increased by 3,369.25 MWh and utilization rate of energy-intensive loads was promoted to 100% in the case analysis, which verifies the effectiveness of the proposed method.
Highlights
Though the compensation mechanism is not what we focus in this paper, it is not difficult to get the point that the compensation for ancillary regulation would be part of the cost of consuming the curtailed wind power
This is because the profile of regulating power of energy-intensive loads is composed of multi horizontal lines, which determines that the regulating power for an interval is limited by the regulation capacity and the curtailed wind power at this interval, and limited by the conditions of adjacent intervals
The flexibility of energy-intensive loads are believed to be beneficial for improving the performance of the power grid
Summary
It is reported that the installed wind power capacity in China had reached 163.67 GW by the end of 2017 [1], the lack of regulation capacity in the power system severely limits the consumption of wind power, especially in those districts where large-scale wind power farms are located. Energies 2018, 11, 2925 provides great opportunities for increasing the wind power consumption with the regulation ability of energy-intensive loads. Considering the regulation limitations of the energy-intensive loads, for example the stable operation period required after one regulation, the regulating load power cannot fully follow the fluctuating wind power. This is what the term characteristic mismatches used in this paper means. How to make the best use of the regulating capability of the energy-intensive loads to reduce the wind power curtailment under the characteristic mismatches and the corresponding scheduling model are of great significance for further promoting wind power consumption
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