PV Systems - Components and Concepts Maximum Power Point Tracking - - PowerPoint PPT Presentation

▶

Dec 25, 2023 276 likes •527 views

PV Systems - Components and Concepts Maximum Power Point Tracking (MPPT) Week 7.3 Arno Smets Generic I-V curve of a solar cell P MPP I SC Current I Power P Maximum Power Point (MPP) V OC Voltage V PV cell, module and array Connection in

SLIDE 1

Arno Smets

PV Systems - Components and Concepts

Maximum Power Point Tracking (MPPT)

Week 7.3

SLIDE 2

Generic I-V curve of a solar cell

VOC ISC

Maximum Power Point (MPP)

Power P Current I Voltage V

PMPP

SLIDE 3

PV cell, module and array

Connection in series  voltages add up

v A

3 2 1 0.4 0.8 1.2 1.6 2.0 VOC 2VOC Cells current (A) Cell voltage V (V)

Connection in parallel currents add up

A v

Cell voltage V in V 3 2 1 0.1 0.2 0.3 0.4 0.5 VOC Cells current (A) 0.6 6 5 4 9 8 7 3ISC 2ISC 3VOC ISC

SLIDE 4

Generic I-V curve of a PV module

Irradiance G Temperature T

Current I Voltage V VOC ISC

SLIDE 5

PV module – operating point

Temperature T Irradiance G (I,V)

Current I Voltage V VOC ISC

SLIDE 6

PV module – PV curve

Current I Power P Voltage V

PMAX

P V I  

(I,V) (P,V)

VOC ISC

SLIDE 7

PV curve - MPPT

PMPP

Power P Vmpp Impp Current I Voltage V

Maximum Power Point (MPP)

SLIDE 8

PV module – Need for MPPT

Voltage V

PMPP

Power P Vmpp Current I Impp

P’MPP

SLIDE 9

MPPT Techniques

MPP Tracking

Voltage V Power P Current I

Fixed Voltage Method Fractional Open Circuit Voltage Method

Indirect

Perturb and Observe Method Incremental Conduction Method

Direct

SLIDE 10

MPPT – Fixed Voltage Method

PMPP winter

Power P Current I Voltage V

PMPP summer

Constant irradiance

SLIDE 11

MPPT – Fractional Open Circuit Voltage

Power P Current I Voltage V

mp p

V k V  

VOC Vmpp

PMPP

Impp V’OC

P’MPP

V’mpp I’mpp

SLIDE 12

Addition of a pilot PV cell

Module Pilot cell

Power P Current I Voltage V VOC Vmpp

PMPP

Impp V’OC

P’MPP

V’mpp I’mpp

mp p

V k V  

SLIDE 13

MPPT – Perturb and Observe

PMPP

Power P Current I Voltage V

SLIDE 14

MPPT – Perturb and Observe - Drawback

PMPP

Power P Current I Voltage V

P’MPP

A B

PA > PB

SLIDE 15

MPPT – Incremental Conductance

VOC

ISC Power P

Vmpp Impp d P dV  d P dV 

Current I Voltage V

d P dV  d P dV 

I Conductance V 

SLIDE 16

MPPT – Incremental Conductance

( ) d P d I V dV d V   d P V d I I dV dV    I I V V   

At MPP

I I V V   

To the left of MPP

I I V V   

To the right of MPP

SLIDE 17

MPPT – Incremental Conductance

VOC

ISC Power P

Vmpp Impp

Current I Voltage V

I I V V    I I V V    I I V V   

SLIDE 18

Incremental Conductance Algorithm

V(t), I(t), Vref(t) ΔI = It-It-1 ΔV = Vt-Vt-1

I V  

I V 

?

Increase Vref

> <

Decrease Vref Maintain Vref

RETURN

=

SLIDE 19

MPPT – Incremental Conductance

VOC

ISC Power P

Vmpp Impp

Current I Voltage V

I I V V    I I V V    I I V V   

SLIDE 20

MPPT – Hardware Implementation

BUCK BOOST DC-DC CONVERTER

SLIDE 21

MPPT – Products

Steca Solarix MPPT Charge Controller Steca Grid 500 MPPT Inverter

SLIDE 22

MPPT – Summary

VOC ISC

Maximum Power Point (MPP)

Power P Current I Voltage V

PMPP

SLIDE 23