NDLI: Balanced and unbalanced inverter strategies in battery storage systems for low-voltage grid support

Content Provider	IET Digital Library
Author	Geth, Frederik Tant, Jeroen Belmans, Ronnie Driesen, Johan
Abstract	The design of battery storage systems includes technology choices for the batteries and for the inverter. The impact of the inverter design on the optimal design and operation of the storage system has not been analysed before. Therefore four inverter designs are compared with this research. The most basic inverter model assumes only symmetric active power exchange; the most advanced inverter model allows interphase active power transfer and reactive power control. A multi-objective optimisation method is used, to visualise the trade-offs between two technical objective functions for cycling control – voltage regulation and peak power reduction – for a given annual cost. The method is applied to a real-world scenario, based on an existing feeder in a residential part of a city in Flanders, Belgium. Internal losses and losses in the grid are quantified for the different designs. Modelling a battery storage system purely as a finite source/sink of active power in a low-voltage grid, strongly underestimates the potential because of the existing phase unbalance. Counteracting phase unbalance through an inter-phase power transfer capable inverter, even more so than adding reactive power control, improves the performance of battery storage systems.
Starting Page	929
Ending Page	936
Page Count	8
ISSN	17518687
Volume Number	9
e-ISSN	17518695
Issue Number	Issue 10, Jul (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/9/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2014.0341
Journal	IET Generation, Transmission & Distribution
Publisher Date	2015-05-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Battery Storage Plants Battery Storage System Control of Electric Power System Cycling Control For Low-voltage Grid Support Interphase Active Power Transfer Interphase Power Transfer Capable Inverter Inverter Design Invertors Low-voltage Grid Multiobjective Optimisation Method Optimisation Optimisation Technique Peak Power Reduction Phase Unbalance Power Grid Reactive Power Control Secondary Cell Symmetric Active Power Exchange Unbalanced Inverter Strategy Voltage Control Voltage Regulation
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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