The reactive-power service will be or is already obligatory for new grid-connected photovoltaic systems. The paper investigates the impact of the reactive-power service on the energy yield of a photovoltaic system and its effect on the inverter sizing and economic yield. Based on simulations and analysis of an operating photovoltaic system we show that energy losses due to the reactive-power se...

In this paper, a novel current control technique is proposed to control both active and reactive power flow from a micro grid system fed by a renewable energy source through a single phase parallel-connected inverter. The parallel connected inverter ensures active and reactive power flow from grid with low total harmonic distortion even in the presence of non linear load. A p-q theory based app...

In this paper wind and solar based stand-alone hybrid energy system is presented for the remote area power system applications. The wind, solar, battery, fuel cell and dump load (i.e., aqua-electrolyzer) are connected to the common dc bus. An ac load is connected to dc bus through a pulse width modulation (PWM) based inverter. Ac voltage at load bus can be maintained at rated value by regulatin...

This paper analyses whether any differences in behaviour arise due to an induction motor being star or delta connected when supplied by a current source inverter. Two comparisons are considered. The first is that of a delta connected motor compared to a star connected motor of the same power and voltage ratings; the star connected motor in this case is then mathematically the delta connected mo...

The penetration of renewable energy in modern power system, microgrid has become a popular application worldwide. In this paper bidirectional converters for AC and DC hybrid microgrid application are proposed as an efficient interface. To reach the goal of bidirectional power conversion, both rectifier and inverter modes are analyzed. In order to achieve high performance operation and single-ph...

Grid connected inverters are important building blocks in renewable energy conversion systems. In conventional voltage sourcing grid connected inverters, any mismatch between the synthesized output waveforms of the inverters and the grid voltage will generate large erroneous currents unless a fast current feedback is used. The current control requires rather fast sampling rates and considerable...

Received Jul 8, 2014 Revised Oct 6, 2014 Accepted Oct 20, 2014 Renewable power generation using photovoltaic is very interesting to be developed to deal with the problems of conventional energy sources and environmental issues. The photovoltaic power generation can operate both in stand-alone and grid-connected operations. This paper presents an application of the single-phase five-level common...

This study presents a synchronized output regulation (SOR) strategy for controlling inverters operating in grid-connected and stand-alone modes. As a concept of networked dynamic systems, SOR involves nodes with outputs that are synchronized but display a desirable wave shape. Under the SOR strategy, inverter and utility are regarded as two nodes that comprise the simplest network. These two no...

Abstract—The global energy consumption is increasing persistently and need for distributed power generation through renewable energy is essential. To meet the power requirements for consumers without any voltage fluctuations and losses, modeling and design of multilevel inverter with Flexible AC Transmission System (FACTS) capability is presented. The presented inverter is provided with 13-leve...