Abstract
With the rapid growth of renewable energy and the DC fast charge pile of the electric vehicle, their inherent volatility and randomness increase a power system’s unbalance of instantaneous power. The need for power grid frequency regulation is increasing. The energy storage system (ESS) can be used to assist the thermal power unit so that a better frequency regulation result is obtained without changing the original operating mode of the unit. In this paper, a set of different charging/discharging control strategies of the lithium titanate battery (LTO) is proposed, which are chosen according to the interval of the State of energy (SOE) to improve the utilization rate of the ESS. Finally, the cost-benefit model of the ESS participating in automatic generation control ancillary service is established. Case analysis proves that after a 1.75 MWh ESS is configured for a 600 MW thermal power unit, Kp and D is increased from 1.42 to 6.38 and 2857 to 6895 MW. The net daily income is increased from 20,284 yuan to 199,900 yuan with a repayment period of 93 days. The results show that the control strategies and the energy configuration method can improve the performance and economic return of the system.
Highlights
With the development of the global economy, the energy, once one of the pillars of social development, has severely restricted sustainable development under the influence of various factors.From high-carbon to low-carbon [1], from low-efficiency to high-efficiency, from unsustainable to sustainable, it is a basic requirement for sustainable development that renewable energy replaces traditional energy to achieve energy storage and conversion
It is seen that the system can basically satisfy the needs of the Automatic Generation Control (AGC) ancillary service
After reaching the upper limit, the strategy of active discharge and negative charging are adopted making the state of energy (SOE) quickly returned to about 50%, which means that the control strategy of this paper is very intelligent to effectively control the SOE
Summary
With the development of the global economy, the energy, once one of the pillars of social development, has severely restricted sustainable development under the influence of various factors. From high-carbon to low-carbon [1], from low-efficiency to high-efficiency, from unsustainable to sustainable, it is a basic requirement for sustainable development that renewable energy replaces traditional energy to achieve energy storage and conversion. The new energy industry, especially the renewable energy industry, will become a new growth point for the global economy in the future. Various technologies have been developed to achieve the goals of energy conservation and sustainable development [3,4]. Energy storage technology which is the Energies 2020, 13, 505; doi:10.3390/en13020505 www.mdpi.com/journal/energies
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