Grid integration of hybrid renewable energy source using Aligned Multilevel Inverter

摘要

Grid connected hybrid renewable energy sources(RES) are main challenges nowadays. Interconnectingof two or more RES is called hybrid system and battery isoptional in this kind of systems where grid is in active. Thenormal inverters are unable to produce sinusoidal voltagesand this will cause many problems in grid connected system.Hence, many topologies of multilevel inverters areproposed which can able to produce sinusoidal outputvoltage. However, the cost and operational complexity willincrease due to increasing number of switches. In order toreduce total number of switches, an Aligned MultilevelInverter (AMI) configuration of three phase is implementedin this paper. Wind energy-based electrical power generationsystem and solar energy based electrical powergeneration systems are considered for interconnection.Energy storage devices such as batteries are not incorporatedto system since considered grid is in active mode.Maximum power point tracker (MPPT) devices are availableto extract maximum power from photovoltaic arraysand wind turbines, hence a boost converter is consideredas MPPT converter for wind turbine and proposed AMI alsoworks as MPPT converter for PV by using proposedcontroller. Hence extra DC–DC converters are not essentialfor PV system for MPPT, resulting in reduction of overallsystem cost. Also, the modified invasive weed optimization(MIWO) based algorithm is proposed for PV system toharvest maximum energy under partial shading conditions.The proposed MIWO is compared with particleswarm optimization (PSO) and grey wolf optimization(GWO) to enhance the performance of proposed algorithm.Extensive results are validated with Hardware-in-Loop(HIL) designed on OPAL-RT platform.