Abstract:The design of Transformerless converter concept is developed extensively for the increasing of the efficiency and reliability of the electrical systems which in-turn reduces the major power losses. Consider the conventional inverter where the power from the DC source is initially inverter and then the inverted voltage is boosted using low frequency power transformer. The use of the low frequency transformer increases the cost and size of the system which also increases considerable amount of power loss hence, the necessity of development of a low cost lossless power technology has generated. In photovoltaic applications, transformerless power converter technology is in trend where in, the system is developed such that the output of the solar panel is connected to a single power electronic module which generates the desired output. The modified boost converter uses a couple of inductors at the input side to produce ripple free current without utilization of LC filters. The performance of the modified boost converter has been increased positively with high power conversion capability. The Transformerless grid synchronized photovoltaic system with conventional voltage source inverter may cause electrical safety issue of ground leakage current which is generated using the presence of parasitic capacitance photovoltaic modules and is eliminated using the implementation of bipolar SPWM technology for voltage source inverter. The proposed system is designed and simulated using PSIM.
This project presents the simulation of Variable speed WECs using PMSG and Z-Source Inverter. Permanent-magnet synchronous generators (PMSGs) are used by these technologies due to special characteristics of PMSGs such as low weight and volume, high performance, and the elimination of the gearbox. In this project a new variable-speed WECS with a PMSG and Zsource inverter is proposed. The permanent magnet synchronous generator is controlled to obtain maximum power from the incident wind with maximum efficiency under different load conditions. Characteristics of Zsource inverter are used for maximum power tracking control and delivering power to the grid, simultaneously. Extracting maximum power from wind and feeding the grid with high-quality electricity are two main objectives for WECSs. To realize these objectives, the ac-dc-ac converter is one of the best topology for WECSs. The Zsource inverters have been reported recently as a competitive alternative to existing inverter topologies with many inherent advantages such as voltage boost. This inverter facilitates voltage boost capability with the turning ON of both switches in the same inverter phase leg. In this proposed topology, boost converter is omitted without any change in the objectives of the WECs. Reliability of the system is greatly improved, because the short circuit across any phase leg of inverter is allowed. Also, in this configuration, inverter output power distortion is reduced, since there is no need to phase leg dead time. This project introduces Z-source inverter and describes operation of rectifier feeding the Z source inverter. Then power delivery and MPPT control of system are explained.IEEE Sponsored 2nd International Conference on Innovations in Information Embedded and Communication Systems ICIIECS'15 978-1-4799-6818-3/15/$31.00
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