Control Strategies and Economic Analysis of an LTO Battery Energy Storage System for AGC Ancillary Service

Energies

Yangxi Li¹  Wenzhong Gao²  Yang Yang³  Xiaojia Su⁴  Xitian He⁴  Bingxiang Sun⁴  Weige Zhang⁴  Minming Gong⁴  Zhenlin Zhu⁴ 

[1] CHINT ESS Division, Shanghai 201614, China;Department of Electrical and Computer Engineering, University of Denver, Denver, CO 80208, USA;Envision Energy, Shanghai 200051, China;National Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, China;

关键词: automatic generation control (agc);    energy storage system (ess);    lithium titanate battery (lto);    central control strategy;    energy configuration;    economic analysis;   

DOI  :  10.3390/en13020505

来源: DOAJ

【 摘 要 】

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, K_p 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.

【 授权许可】

Unknown