Study On The Optimal Operation Considering The Impacts Of Solar PV And Battery Storage In Microgrid

The deployment of distributed energy storage system will play a critical role in future microgrid.With the growing penetration of distributed generation(DG),such as solar and wind power,the power grid transitions from a vertically integrated system to a more decentralized two-way network.Solar power is an extensive renewable source which is expected to perform a growing role in the future distributed generation infrastructure of the grid.The more integration of renewable energy sources into microgrid result in active power,reactive power,voltage and voltage issues.For smooth operation of microgrid the above-mentioned parameters must be maintained in the specific limits.Therefore,this this research focuses on the optimal operation of microgrid,which contains voltage/frequency regulations and power quality improvement.The voltage regulation is achieved by designing the maximum power point tracking(MPPT)charge controller for PV system.Meanwhile,interlinking converter(ILC)is utilized to regulate the frequency on AC side and voltage on DC side of the hybrid microgrid.Additionally,battery energy storage system(BESS)is proposed to support microgrid under abnormal conditions of frequency and voltage.Furthermore,power quality improvement of the grid is obtained by considering the non-technical losses(NTL).Photovoltaic(PV)system is classified into several parts,each of which has DC-DC converter for MPP(maximum power point)as well as a two-level grid connected inverter with various control strategies.PV cells and batteries are most costly elements and its efficiency is low.This work therefore focuses primarily on the design of an effective,low-cost simplified charge controller.The benefit of the proposed MPPT charge controller is that,its performance is higher than other traditional charging controllers.Similarly,for voltage support a DC-DC converter is used,which is intended to minimize harmonics and perform the voltage regulations.The DC-DC converter is used by controlling voltages around the PV array and DC link capacitor.In addition,an enhanced droop control scheme for hybrid microgrid control is introduced along with ILC frequency and active power-based droop.Thus,a steady-state control scheme is implemented for the entire hybrid grid,which attempts to evaluate the effect of load shifts on DC voltage and AC frequency.Finally,a brief description of the BESS is presented and a new model of the BESS is proposed under different conditions for voltage frequency regulation and impulsive load neutralization,when(a)system at normal condition(b)under high load and(c)system under fault.The existing grid system is facing problems,such as the gap between demand and supply,line losses and non-technical losses(NTL).The blackouts in system due to the natural disasters combined with the electricity theft,unmetered homes form the NTL.At the end,this research also focuses on NTL that causes problems such as voltage stability and power quality issues in power grids.A simulation framework is conceived for this purpose by AMI(Automatic metering infrastructure).Similarly,with the help of such program,load balancing and monitoring of the entire network is achieved.