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Effect Analysis for Frequency Recovery of 524 MW Energy Storage System for Frequency Regulation by Simulator
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 Title & Authors
Effect Analysis for Frequency Recovery of 524 MW Energy Storage System for Frequency Regulation by Simulator
Lim, Geon-Pyo; Choi, Yo-Han; Park, Chan-Wook; Kim, Soo-Yeol; Chang, Byung-Hoon; Labios, Remund;
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To test the effectiveness of using an energy storage system for frequency regulation, the Energy New Business Laboratory at KEPCO Research Institute installed a 4 MW energy storage system (ESS) demonstration facility at the Jocheon Substation on Jeju Island. And after the successful completion of demonstration operations, a total of 52 MW ESS for frequency regulation was installed in Seo-Anseong (28 MW, governor-free control) and in Shin-Yongin (24 MW, automatic generation control). The control system used in these two sites was based on the control system developed for the 4 MW ESS demonstration facility. KEPCO recently finished the construction of 184 MW ESS for frequency regulation in 8 locations, (e.g. Shin-Gimjae substation, Shin-Gaeryong substation, etc.) and they are currently being tested for automatic operation. KEPCO plans to construct additional ESS facilities (up to a total of about 500 MW for frequency regulation by 2017), thus, various operational tests would first have to be conducted. The high-speed characteristic of ESS can negatively impact the power system in case the 500 MW ESS is not properly operated. At this stage we need to verify how effectively the 500 MW ESS can regulate frequency. In this paper, the effect of using ESS for frequency regulation on the power system of Korea was studied. Simulations were conducted to determine the effect of using a 524 MW ESS for frequency regulation. Models of the power grid and the ESS were developed to verify the performance of the operation system and its control system. When a high capacity power plant is tripped, a 24 MW ESS supplies power automatically and 4 units of 125MW ESS supply power manually. This study only focuses on transient state analysis. It was verified that 500 MW ESS can regulate system frequency faster and more effectively than conventional power plants. Also, it was verified that time-delayed high speed operations of multiple ESS facilities do not negatively impact power system operations. It is recommended that further testing be conducted for a fleet of multiple ESSs with different capacities distributed over multiple substations (e.g. 16, 24, 28, and 48 MW ESS distributed across 20 substations) because each ESS measures frequency individually. The operation of one ESS facility will differ from the other ESSs within the fleet, and may negatively impact the performance of the others. The following are also recommended: (a) studies wherein all ESSs should be operated in automatic mode; (b) studies on the improvement of individual ESS control; and (c) studies on the reapportionment of all ESS energies within the fleet.
Battery energy storage system;frequency regulation;governor-free control;
 Cited by
Ki-Yeol Shin, Tae-Hwan Jin, Mo Chung, Herie Park, Geon-Pyo Lim, "Dynamic Simulation of MW Battery Energy Storage System with Korea Power Grid for the Frequency Regulation Control", SDEWES2015, 2015.

Geon-Pyo Lim, Hyun-Gyu Han, Byung-Hoon chang, Seun-Gwon Yang, Yong-Beom Yoon, "Demonstration to operate and control frequency regulation of power system by 4MW energy storage system", KIEE, pp. 169-177, 2014.

Geon-Pyo Lim, Byung-Hoon Chang, Yong-Beum Yoon, "Development and demonstration of frequency regulation controller by ESS", Spring conference of KIEE Power system and automation study, 2015.

Geon-Pyo Lim, "The development of controller 52MW battery energy storage system for frequency regulation", Electric power technology trend, 2015.

Geon-Pyo Lim, Woong-Jae Jeon, Hyun-Gyu Han, Chan-Wook Park, Ji-Hoon Im, Byung-Hoon Chang, Yong-Beum Yoon, "The developement and application of control system for 52MW battery energy storage system to regulate frequency of power system", KIEE Spring conference of KIEE electric power economy and ESS study, 2015.