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Done by Manjunath R D 1BY13EE021Nagesh L 1BY13EE025Niteesh S Shanbog 1BY13EE026Prashanth C 1BY13EE032

PV Integrated to Micro-grid for Power Quality Improvement

Guide Prashanth NA

IntroductionGrowth of solar power production Non pollutingRenewable SourceLow MaintenanceUsed in remote areas

Problems encounteredIntegration of output of PV Cell with the grid

Non Linear loads

ConstraintsGrid Code

Voltage regulation %VR=IVN-VFLI/IVFLI*100 Tolerance Value= 5%-10%

Frequency Limit For a 50Hz supply : 49.5Hz to 50.5Hz

So how do we solve it?Reducing the harmonics By injecting the compensating current at the PCC(Point of Common Coupling). By supplying the harmonic and reactive power by an active power filter.

Power Equation:

Ps=Pa+Pr+Ph Ps- instantaneous power Pa- active fundamental power Pr-reactive power Ph- harmonic power

Compensating current equation: Total source current including losses is given as i*s = Isp sint Isp - total peak current supplied by micro grid, where Isp = Ip+ IsLoss Ip - source current after compensationIsLoss - losses occurred due to switching, conducting and capacitor leakages. So compensating current is given as ic(t) = is - i*s is = instantaneous current

After compensation:

- =

waveform of compensating current

Overall configuration planned

What weve done so far?Design of Hardware 1. Three phase inverter

A Basic 3Phase inverter circuit using Mosfet

Switching device used: Power Mosfets with Vgs > 10V

Connections to the Inverter PWM Controller: 8051 Atmel AT89S52 The PWM controller generates pulses corresponding to the compensating current required.

Block diagram of MOSFET drive Buffer used: Non inverting amplifier IC CD4050B Isolater used: Opto isolater IC 6N137 Driving circuit: IC IR2101

Simulation A Basic 3 phase inverter was simulated using MATLAB under 180 deg conduction mode and the following voltage waveform was obtained.

Literature SurveyPV Source Integrated Micro-Grid for Power Quality Improvement PRADEEP ANJANA1, VIKAS GUPTA1, H.P. TIWARI1, NITIN GUPTA1 1Department of Electrical Engineering, Malaviya National Institute of Technology Jaipur, IndiaHasan Komurcugil Double-band hysteresis current-controlled single phase shunt active filter for switching frequency mitigation, Electric Power and Energy System, vol. 69, pp. 131-140, July 2015.

Whats left to do?Design of closed loop current control system.Simulation of SAPF for power quality improvement.Fabrication of hardware involving boost converter and the three phase inverter.

Thank You!