MPPT USING PO AND PSO
METHOD UNDER PARTIAL
SHADING
PROPOSED ARCHITECTURE OF A PV-GRID
DC FAST CHARGING SYSTEM
• circuit
2
ALGORITHMS USED
• Perturbation and Observation (P&O)
• Incremental Conductance (IncCond)
• DOUBLE INTEGRAL SLIDING MODE MPPT
• Grey wolf optimization technique
• Flower pollination algorithm
• GA based mppt
• Particle swam optimization
PARTIAL SHADING OF PV
• shaded cell stops producing electrical energy and behaves more
like a semiconductive resistance.
• The shaded cell generates less current than the other two cells
strongly decreasing the energy production of the series string.
• The result is that the power being generated by the “sunny” cells
is now being dissipated by the “shaded” cell which can, over time,
cause overheating (hot spots) and eventually destruction of the
bad cell.
• This reverse voltage causes current to now flow in the opposite
direction through the shaded cell resulting in it consuming power
at a rate depending on ISC and operating current, I.
• Thus a fully shaded cell will experience a reverse voltage drop
under any current conditions and therefore dissipate or consume
electrical power rather than generate it.
Bypass Diodes
• One simple and effective way to protect
photovoltaic cells from against the destructive
effects of cell shading is to connect what is called
a Bypass Diode across each PV cell of a seriesconnected string.
P&0 ALGORITHM