Dr Richard Lewis

Senior Researcher

College of Engineering, Swansea University

  • 01792 606556
  • r.p.lewis@swansea.ac.uk

Experience

Richard's background is in: real time metering and monitoring of power, both generated and consumed within the context of renewable technologies; collection of large datasets with real-time analysis at second and sub-second rates of capture; power electronics research including AC to DC, DC to AC and DC to DC converters; digital system design for embedded devices including industrial communication busses and graphical user interfaces; custom presentation software design including representation of energy flows; and internet enabled devices and systems for remote data collection and presentation.

Publications

Lewis, R.P.; Igic, P.; Zhongfu Zhou, "Assessment of communication methods for smart electricity metering in the U.K.," Sustainable Alternative Energy (SAE), 2009 IEEE PES/IAS Conference on , vol., no., pp.1,4, 28-30 Sept. 2009

doi: 10.1109/SAE.2009.5534884

Abstract: Communication methods for smart metering pose a number of unique challenges driven from the demand for a unique communication network that can communicate with some 28 million devices in the U.K. with near real-time latency. In this paper an overview of communication methods for Smart Metering is presented, focusing towards ”The Last Mile” of the communication network connected to the metering device. The need for robust low-bandwidth communications is a core requirement due to the possible interference from consumer products operating in unlicensed frequency bands. Investigations towards both wired and wireless technologies are performed and conclusions indicate that Power Line Communication (PLC) is becoming a low cost method to communicate with metering devices. Additionally, it can operate in relatively low bandwidth channels in the sub 100kHz region of the spectrum. An analytical approach towards analysis of coding schemes for OFDM based PLC systems is performed. Through investigation of current state of the art coding techniques we present a series of performance markers for (PLC) at low-bit rates when degraded with various channel effects. Results show that (PLC) has real potential for Smart Metering networks where high-levels of interference are present from existing communication technologies.

 

Fazeli, M.; Igic, P.; Holland, P.; Lewis, R.P.; Zhou, Z., "Novel Maximum Power Point Tracking with classical cascaded voltage and current loops for photovoltaic systems," Renewable Power Generation (RPG 2011), IET Conference on , vol., no., pp.1,5, 6-8 Sept. 2011

doi: 10.1049/cp.2011.0109

Abstract: Almost all of the Maximum Power Point Tracking (MPPT) methods for photovoltaic (PV) systems are based on searching algorithms. Searching algorithms require relatively complex control schemes and reduce the speed and accuracy of the MPPT method. This paper proposes a novel MPPT method which aims to circumvent traditional searching algorithms thus increasing the speed and accuracy of the response to varying irradiation levels. The method will be validated through MATLAB-SIMULINK simulations.

 

Wang, C.; Zhou, Z.; Liu, Y.; Kanniche, M.S.; Holland, P.M.; Lewis, R.P.; Batcup, S.G.; Igic, P., "A predictive dead-beat PI current controller for active power filters," Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference on , vol., no., pp.1,8, Aug. 30 2011-Sept. 1 2011

Abstract: In this paper, a predictive dead-beat proportional-integral (PI) current control algorithm is studied for shunt active power filters (APFs). To investigate the effectiveness of the proposed control scheme a digital control based simulation model is built using commercially available VisSim software. Performance comparison with different control schemes are carried out. Excellent performance of active power filter has been achieved based on the proposed control strategy.