Control of a bidirectional converter to interface ultracapacitor with renewable energy sources

Abdullah, Mokhtar; Yatim, A.H.M.; Tan, Chee Wei; Samosir, Ahmad Saudi

doi:10.1109/icit.2013.6505752

Cited by 24 publications

(12 citation statements)

References 38 publications

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“…Generally, the voltage of the ESS (battery and/or supercapacitor) is lower than the dc-link voltage and the polarity of the energy storage, and its output is set to the same with respect to the common ground. The dc-dc bidirectional converter is suited well for this type of application, because proper control of the switches regulate the dc-link power fluctuations by directing them to the energy storage [33][34][35]. This is a simple converter, which can be used in high-power applications where the switch rating of the converter becomes the key concern [23,36].…”

Section: Dc-dc Converter Controllermentioning

confidence: 99%

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

et al. 2018

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This paper applies model predictive control (MPC) for the power processing of an oscillating water column (OWC) wave energy conversion (WEC) system to achieve smooth power delivery to the grid. The particular air turbine design adopted in this study produces large power pulses ranging from 0 to 1 MW in magnitude, and thus, direct connection to the grid is practically impossible, especially in weak grid conditions. Therefore, energy storage is an essential element that should be integrated into this particular WEC system in order to absorb power pulses and thereby ensure smooth delivery of power to the grid. Taking into account the repetitive nature, duration, and magnitude of the power pulses, this study has chosen "supercapacitor" as the suitable energy storage technology. The supercapacitor energy storage (SCES) is integrated into the dc-link of the back-to-back power converter of the WEC system through a bidirectional dc-dc converter. In order to achieve the desired operation of this complex power converter arrangement, a finite control set MPC strategy is proposed in this paper. Performance of the proposed energy storage system (ESS) and control strategy are evaluated through computer simulations. Simulation results show that the proposed SCES system and the control strategy are able to achieve smooth power delivery to the grid amidst power pulses coming from the generator. exhale and inhale air streams through the open end of the chamber. Energy of the air stream is then converted into electricity with the aid of a turbine coupled generator. The commonly used turbines are bidirectional which extract energy from both the inhale and exhale streams.The Australian maritime college, in collaboration with the Wave Swell Energy Ltd., has developed a new OWC air turbine technology, which has been recognized as an efficient and simple design compared with many other OWC technologies [6,7]. This particular configuration has passive, non-return air flow valves built into its chamber, which activate during the exhale stage and equalize the pressure inside the chamber to the atmosphere, which allows the rising water column to reach its maximum height. This creates a higher differential pressure during the inhale stage resulting in high velocity air stream through the turbine. Since this particular air turbine extracts energy only during the inhale stage, the output power inherently becomes discrete pulses. These large and discrete power pulses create major operational issues, such as frequency deviations, voltage sags/swells, and instabilities if delivered to the grid without smoothing. Therefore, energy storage is an essential feature that should be incorporated into the power converter of the WEC system. Nevertheless, in contrast to wind energy or tidal energy turbines, where the rotational speed should be changed according to the wind speed or tidal flow speed, the unidirectional air-turbine used in this study does not necessarily require variable speed operation. Therefore, according to [8], the turbine speed can be ...

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Section: Dc-dc Converter Controllermentioning

confidence: 99%

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

et al. 2018

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“…In this work, the bidirectional converter works as boost converter for discharging battery and works as buck converter for charging [26]. The state space model is given by equation…”

Section: A Photovoltaic Conversion Systemmentioning

confidence: 99%

Power management strategy for renewable hybrid stand-alone power system

Dahmane

Bosche

El-Hajjaji

2015

2015 4th International Conference on Systems and Control (ICSC)

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Hybrid systems of energy production are considered as an interesting alternative for power supply of remote area and non connected sites. Indeed, this paper is focused on the design of an intelligent algorithm and optimized strategy for power management of a renewable hybrid system. This system which includes wind generator (W G), photovoltaic panel (PV ), battery storage (BS) and diesel engine (DE) aims to ensure power supply of an individual isolated house. Indeed, the proposed optimal power management strategy aims to regulate the power flow between the energy sources and the battery storage in order to ensure permanent energy supply of the load. The chosen strategy considers the W G and the PV as the main energy sources and the battery bank as storage system. The DE is considered as an additional source, so it is used like power source emergency. In order to validate the proposed strategy under real conditions; measurements of real weather conditions and power consumption of an individual house are considered. Simulation results are highlighted to demonstrate the feasibility of our proposed approach.978-1-4799-8318-6/15/$31.00 ©2015 IEEE 978-1-4799-8318-6/15/$31.00 ©2015 IEEE

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“…Besides being environmentally friendly, renewable energy sources are continually renewed by the cycle of nature and are considered to be practically inexhaustible [1]. Consequently, the future of these sources as a typical alternative for the traditional sources looks very bright.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is a need to support these sources by energy storage device, which it either injects stored energy or absorbs excess energy during the transients in the wind energy conversion system (WECS). This would ensure a smooth output power to the load [1].…”

Section: Introductionmentioning

confidence: 99%

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A simulation study of hybrid wind-ultracapacitor energy conversion system

Abdullah

Tan

Yatim

2014

2014 IEEE Conference on Energy Conversion (CENCON)

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Wind energy conversion system (WECS) is controlled to capture the maximum available power upon the available wind speed to make the system economical and operates at optimized efficiency. The nature characteristic of wind generator is nonlinear which leads to variable power output generation. In addition, the demanded load power is subjected to a change due to any disturbances may happen in the load voltage or current. Therefore, it is essential to integrate the WECS with a suitable storage element to either, act as a source of compensating the inadequate in power, or act as a load to absorb the excess power generated by the wind generator. Although the AC rectified voltage of the wind generator is proportional to the wind speed which is variable, however, the DC-bus voltage is usually regulated by the bidirectional converter at a specified value. Hence, the output power of the system can be investigated by means of the output currents from the WECS and the ultracapacitor. This paper presents several different test scenarios of the proposed hybrid WECS-ultracapacitor simulated using MATLAB/Simulink software. It also highlights the important role of the ultracapacitor in ensuring a continuous power flow.

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Control of a bidirectional converter to interface ultracapacitor with renewable energy sources

Cited by 24 publications

References 38 publications

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

Power management strategy for renewable hybrid stand-alone power system

A simulation study of hybrid wind-ultracapacitor energy conversion system

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