M. Arumugam

Bio: M. Arumugam is an academic researcher from Bahir Dar University. The author has contributed to research in topics: Z-source inverter & Photovoltaic system. The author has an hindex of 4, co-authored 13 publications receiving 31 citations.

Z Source Inverter Topologies-A Survey

Abstract: Need for alternative energy sources to satisfy the rising demand in energy consumption elicited the research in the area of power converters/inverters. An increasing interest of using Z source inverter/converter in power generation involving renewable energy sources like wind and solar energy for both off grid and grid tied schemes were originated from 2003. This paper surveys the literature of Z source inverters/converter topologies that were developed over the years.

Comprehensive analysis of Z source DC/DC converters for DC power supply systems

Abstract: The performance of Z source DC/DC converter topologies such as, traditional and Quasi Z source based DC/DC converter (both single and three phase) are analysed, and adopted at the front end of a power conditioning unit for DC power supply system. Various switching schemes like, simple boost PWM, carrier based PWM and space vector PWM control techniques are adopted to control the inverter switches. A new Quasi Z-source network based DC/DC converter topology employing Zigzag transformer is proposed. Transformers either, linear and/or zigzag are implemented individually, for step up as well as isolation functions. Voltage Doubler Rectifier (VDR) circuit is adopted to convert the high ac voltage from the transformer to dc voltage. Simulations are carried out in MATLAB/SIMULINK environment and the results are found to be promising for all the above switching schemes.

Novel improved three-level Z-source inverter

Abstract: This paper deals with the topological analysis of a novel improved three-level Z-source inverter. By connecting a Z-source network to the rear end of the existing three-level inverter, it produces ...

Improved Quasi Z Source Inverter topologies for Photovoltaic Systems

Abstract: This paper investigates the performance of a new family of extended-boost quasi Z Source inverters (qZSI), such as diode, capacitor assisted and its combination ie hybrid topologies are examined as a power conditioner for three phase Photovoltaic (PV) Systems All these topologies are analysed for both continuous and discontinuous modes and extension of the same are simulated through MATLAB/SIMULINK environment Simple boost switching scheme is employed for all these models and the performances of the same are obtained

Experimental Verification of Single Phase Z Source Inverter for Photovoltaic Applications

Abstract: A single phase Z source inverter is developed for better voltage boosting and inversion ability suited for photovoltaic power generation systems. The operation of the Z source inverter is described with relevant equations. Simple boost scheme is used for switching actions of the inverter. The performance of the inverter used for photovoltaic applications can be checked with simulation and experimental results, which prove that it has single-stage buck and boost capability and improved reliability.

Measured Performance of a 1.72 kW Rooftop Grid Connected Photovoltaic System in Ireland

Abstract: This paper presents results obtained from monitoring a 1.72 kWp photovoltaic system installed on a flat roof of a 12 m high building in Dublin, Ireland (latitude 53.4°N and longitude 6.3°E). The system was monitored between November 2008 and October 2009 and all the electricity generated was fed into the low voltage supply to the building. Monthly average daily and annual performance parameters of the PV system evaluated include: final yield, reference yield, array yield, system losses, array capture losses, cell temperature losses, PV module efficiency, system efficiency, inverter efficiency, performance ratio and capacity factor. The maximum solar radiation, ambient temperature and PV module temperature recorded were 1241 W/m2 in March, 29.5 °C and 46.9 °C in June respectively. The annual total energy generated was 885.1 kW h/kWp while the annual average daily final yield, reference yield and array yield were 2.41 kW h/kWp/day, 2.85 kW h/kWp/day and 2.62 kW h/kWp/day respectively. The annual average daily PV module efficiency, system efficiency and inverter efficiency were 14.9%, 12.6% and 89.2% respectively while the annual average daily performance ratio and capacity factor were 81.5% and 10.1% respectively. The annual average daily system losses, capture losses and cell temperature losses were 0.23 h/day, 0.22 h/day and 0.00 h/day respectively. Comparison of this system with other systems in different locations showed that the system had the highest annual average daily PV module efficiency, system efficiency and performance ratio of 14.9%, 12.6% and 81.5% respectively. The PV system’s annual average daily final yield of 2.4 kW h/kWp/day is higher than those reported in Germany, Poland and Northern Ireland. It is comparable to results from some parts of Spain but it is lower than the reported yields in most parts of Italy and Spain. Despite low insolation levels, high average wind speeds and low ambient temperature improve Ireland’s suitability.

Semi-Z-source inverter topology for grid-connected photovoltaic system

Abstract: Transformer-less inverters are necessary parts for grid-connected renewable energy resources. Owing to its cost effectiveness, downsize and less weight, great attention has been paid to these inverters development. With these aforementioned advantages, these inverters have limitations like the flow of leakage current through photovoltaic arrays, high total harmonic distortion (THD) at inverter's output and DC current injection to the grid. This study presents coupled inductor-based single-phase transformer-less semi-Z-source inverter topology to lessen those limitations. Since the DC input and AC output voltage share a common ground, the presented inverter system is categorised under doubly grounded topologies. For the purpose of handling, the non-linearity of the voltage gain of semi-Z-source inverter, a non-linear sinusoidal pulse-width modulation technique has been employed. The prototype of the suggested inverter has been constructed. The performance and compatibility of modulation technique are verified under different loading conditions. The feasibility of the configuration is ensured based on the mitigated common-mode leakage current, the substantially lower THD as well as DC current injected to the grid. Moreover, the presence of coupled inductor significantly contributes in reducing input current ripple, installation area of the inverter and enhancing the efficiency. Finally, this topology exhibits appreciable performance to operate synchronously and transfer power to the grid.

An Overview of Bidirectional AC-DC Grid Connected Converter Topologies for Low Voltage Battery Integration

Abstract: Battery energy storage systems are becoming more and more popular solution in the household applications, especially, in combination with renewable energy sources. The bidirectional AC-DC power electronic converter have great impact to the overall efficiency, size, mass and reliability of the storage system. This paper reviews the literature that deals with high efficiency converter technologies for connecting low voltage battery energy storage to an AC distribution grid. Due to low voltage of the battery isolated bidirectional AC-DC converter or a dedicated topology of the non isolated converter is required. Review on single stage, two stage power converters and integrated solutions are done in the paper.