Dimensioning Methodology of an Energy Storage System Based on Supercapacitors for Grid Code Compliance of a Wave Power Plant

Abstract

The aim of this paper is to present a methodology for dimensioning an energy storage system (ESS) to the generation data measured in an operating wave energy generation plant connected to the electric grid in the north of Spain. The selection criterion for the ESS is the compliance of the power injected into the grid with a specific active-power ramp-rate limit. Due to its electrical characteristics, supercapacitor (SC) technology is especially suitable for this application. The ESS dimensioning methodology is based on a mathematical model, which takes into account the power generation system, the chosen ramp-rate limit, the ESS efficiency maps and electrical characteristics. It allows one to evaluate the number of storage cabinets required to satisfy the needs described, considering a compromise between the number of units, which means cost, and the reliability of the storage system to ensure the grid codes compliance. Power and energy parameters for the ESS are obtained from the calculations and some tips regarding the most efficient operation of the SC cabinets, based on a stepped switching strategy, are also given. Finally, some conclusions about the technology selection will be updated after the detailed analysis accomplished.

Research on Safety Control Method of Power Grid Energy Storage System Based on Neural Network Model

“…The actual load variance is 96.179, the variance after adopting the ref [5] algorithm is 46.459, and the variance after planning with this method is 43.037, which is 7.37% lower than that of the ref [5] method. Although the ref [5] algorithm prolongs the battery life, it discretizes the battery capacity, resulting in the discontinuous ES output, and the peak shaving effect is slightly worse than that of the planning control in this paper.…”

Recent Advances in Energy Storage Systems for Renewable Source Grid Integration: A Comprehensive Review

“…SCESS help the grid ride through the fault, regulate the voltage and control the frequency and improve the power quality issues [96,97]. They have a high cycle life of around 12 years [98]. Currently, supercapacitors are used together with the batteries especially in smart grid applications due to their shorter discharge time.…”

Nonlinear Modelling and Control of a Power Smoothing System for a Novel Wave Energy Converter Prototype

“…Because of their simplicity, supercapacitors are often chosen for the short-time Energy Storage System (ESS) in WECs. In [16,[27][28][29][30][31], the supercapacitors are connected to the DC-link with a bidirectional DC/DC converter. This allows separate control of power flow and DC-link voltage, which also leads to better utilization of the storage.…”