Development and 24 Hour Behavior Analysis of a Peak-Shaving Equipment with Battery Storage

Abstract

This paper presents the development of a peak-shaving equipment, composed by a multilevel converter in a cascaded H-bridge topology and battery banks on the DC links. Between specific time periods, when the demand is higher, the equipment injects active power from the batteries into the grid to provide support to the system. During the other times of the day, when the demand is lower, the converter charges its battery banks with the exceeding (and low producing cost) energy from the grid. The charge and discharge control algorithms are implemented in a digital signal processor (DSP). The precise time of the day information is obtained from a real-time-clock from a global positioning system module (GPS), which communicates with the DSP through the serial interface. This paper presents the control algorithms and experimental results obtained in a 24 h continuous operation of the equipment.

13.8 kV Operation of a Peak-Shaving Energy Storage Equipment With Voltage Harmonics Compensation Feature

“…This module communicates with the DSP via serial UART protocol. A detailed procedure for UART communication between the TMS320F28335 DSP and the GPS is provided in [18], as well as a procedure to decode the time of the day information from the data received (which also includes several other information). Figure 2.…”

“…In a recent paper [18], the authors have presented some preliminary results of a peak-shaving experiment with leadacid battery storage. In that paper, the experimental results had been obtained in a single-phase 127V test bench.…”

“…However, that paper has been written in Portuguese language -which restricts its usage to only a fraction of the readers. Moreover, just like in [18], in [26] the results have also been collected in a 127V test bench. Here the same idea is extended to 13.8kV distribution level.…”

“…Each of these single-phase modules is a cascaded H bridge multilevel converter (although other topologies could have been used as well) described in subsection II-A. The control of each of the single-phase modules is based on reference [18] and is overviewed in Figure 2. The Decision on AC Power & Battery Control block (described in subsection II-B) determines the reference value for amplitude of the AC current i Φ * (where Φ can be any of the three phases A, B or C).…”

Location and Capacity Optimization of Distributed Energy Storage System in Peak-Shaving

“…The constant adjustment of power output results in the rise of generation cost. Distributed energy storage system (DESS) is an advanced alternative to address the challenge which can absorb energy during low demand periods and supply energy during high loads [6,7]. The optimal placement selection and capacity allocation are the key problems to solve when configuring DESSs.…”