Bidirectional boost/buck quadratic converter for distributed generation systems with electrochemical storage systems

Bidirectional boost/buck quadratic converter for distributed generation systems with electrochemical storage systems

Bidirectional boost/buck quadratic converter for distributed generation systems with electrochemical storage systems

Abstract:

The increasing number of distributed generation systems using renewable and non-conventional energy sources show the trend of future generation systems. Most of these systems require power electronic converters as an interface between the DC voltage buses and electrochemical storage systems. Such storage systems, like batteries or supercapacitors, usually need bidirectional DC-DC converters to allow their charge or discharge according with necessary operation conditions. In this paper, a non-isolated bidirectional Buck-Boost converter with high voltage gain for electrochemical storage devices used in distributed generation systems is presented. To achieve high voltage gain ratios, the proposed topology presents quadratic characteristics in both step-down (Buck) and step-up (Boost) operation modes. In addition to the wide conversion range, it presents continuous input and output current, reduced charging/discharging ripple and simple control circuitry. All these features allow the energy exchange smoothly and continuously resulting in a longer durability of storage devices. The principle of the operation of the proposed converter in both operation modes, as well as their theoretical analysis will be discussed. The performance of this bidirectional power converter is confirmed through simulation and experimental results.
Date of Conference: 20-23 Nov. 2016
Date Added to IEEE Xplore: 23 March 2017
Publisher: IEEE

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Optimal distributed generation placement problem for renewable and DG units: An innovative approach

Optimal distributed generation placement problem for renewable and DG units: An innovative approach

Optimal distributed generation placement problem for renewable and DG units: An innovative approach

Abstract:

In this paper, an innovative approach regarding the Optimal Distributed Generation Placement (ODGP) problem is presented. Loss minimization is considered as the objective, while taking into account the network’s technical characteristics as constraints, i.e., node voltage and line thermal limits. Two different aspects are considered; First the installation planning of generic Distributed Generation units (DGs), and second, the installation planning of Renewable Energy Sources (RESs) exclusively. For the latter, the Capacity Factor (CF) concept is implemented and a mix of RESs is considered to be installed e.g., Solar, Wind and Hydro, simultaneously. The implemented analysis demonstrates a method of considering the geographical characteristics of the area, where the examined network is placed, the different weather conditions and the availability of RESs, all at once, by the aid of the CFs, while trying to keep complexity at minimum. Local Particle Swarm Optimization (LPSO) is utilized for solving the ODGP. The method is tested upon 16-, 33and 69-bus systems.
Date of Conference: 6-9 Nov. 2016
Date Added to IEEE Xplore: 23 March 2017
Electronic ISBN: 978-1-78561-406-4
INSPEC Accession Number: 16580715
Publisher: IET

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A Selective Harmonic Elimination Method for 5-Level Converters for Distributed Generation

A Selective Harmonic Elimination Method for 5-Level Converters for Distributed Generation

A Selective Harmonic Elimination Method for 5-Level Converters for Distributed Generation

Abstract:

In Distributed Generation, high power capability and high efficiency are very important requirements. For this reason, this paper proposes a new analytical procedure for Selective Harmonic Elimination in five-level inverters operating at fundamental frequency. For each modulation index, the proposed method calculates all possible switching angles eliminating a specified odd harmonic from the output voltage. The method has limited computational complexity, simple and cost effective realtime implementation, full capability of integration with closed loop control. Simulation and experimental results highlight full elimination of selected harmonic.
Date of Publication: 29 March 2017
Publisher: IEEE

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Online Reconfiguration of Active Distribution Networks for Maximum Integration of Distributed Generation

Online Reconfiguration of Active Distribution Networks for Maximum Integration of Distributed Generation

Online Reconfiguration of Active Distribution Networks for Maximum Integration of Distributed Generation

Abstract:

This paper proposes the online reconfiguration of active distribution networks. The control of the active/reactive output power of distributed generation (DG) units combined with the control of remote controlled switches are employed in order to minimize DG curtailment, alleviate lines congestion, and mitigate voltage rise issues due to DG integration. Convex relaxations of the ac power flow equations and mixed integer linear disjunctive formulations are adopted to the optimization model in order to obtain fast and optimal solutions using standard branch and bound solvers. The computation burden of the optimization procedure is drastically reduced by exploiting the assessment of switching actions, which is performed using multiple load/generation scenarios. The effectiveness of the proposed optimization model is verified using different distribution test systems.
Published in: IEEE Transactions on Automation Science and Engineering ( Volume: 14, Issue: 2, April 2017 )
Date of Publication: 07 December 2016
Publisher: IEEE

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Command Governor Strategies for the Online Management of Reactive Power in Smart Grids With Distributed Generation

Command Governor Strategies for the Online Management of Reactive Power in Smart Grids With Distributed Generation

Command Governor Strategies for the Online Management of Reactive Power in Smart Grids With Distributed Generation

Abstract:

High penetration of distributed generation (DG) in medium voltage (MV) power grids may easily lead to abrupt voltage raises in the presence of either low demand conditions or high power production from renewable sources. In order to cope with the possibly occurring voltage limit violation, the active power injected by the distributed generators is typically curtailed, being, however, such an approach suboptimal from an economical point of view and presenting several other disadvantages. To address this issue, the online management and coordination of the reactive power injected/absorbed by the distributed generators acting on the grid are proposed here. The approach is based on command governor ideas that are used here to optimally solve constrained voltage control problems in both centralized and distributed ways. The approach foresees an active coordination between some controllable devices of the grid, e.g., distributed generators and MV/high voltage transformers, in order to maintain relevant system variables within prescribed operative constraints in response to unexpected adverse conditions. Simulation results show that the proposed approach is more effective than approaches suggested by the current Italian norms on DGs connection.
Published in: IEEE Transactions on Automation Science and Engineering ( Volume: 14, Issue: 2, April 2017 )
Date of Publication: 13 February 2017
Publisher: IEEE

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