PVMD Delft University of Technology Learning objective 1. Maximum - - PowerPoint PPT Presentation

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PVMD Delft University of Technology Learning objective 1. Maximum - - PowerPoint PPT Presentation

Jun 16, 2023 267 likes •545 views

Incremental Conductance Technique Ravi Vasudevan PVMD Delft University of Technology Learning objective 1. Maximum Power Point Tracking 1. Introduction to MPPT 2. Indirect Methods 3. Perturb and Observe 4. Incremental Conductance 5.

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SLIDE 1

PVMD

Delft University of Technology

Incremental Conductance Technique

Ravi Vasudevan

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SLIDE 2

Learning objective

1. Maximum Power Point Tracking

1. Introduction to MPPT 2. Indirect Methods 3. Perturb and Observe 4. Incremental Conductance 5. Cost and Overview

2. Cables 3. Batteries

1. Introduction to Batteries 2. Characteristics of Batteries 3. Charge Controller

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SLIDE 3

How to Power-Point Track

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P

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SLIDE 4

MPPT Techniques

MPP Tracking Indirect Direct

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SLIDE 5

MPPT Techniques

MPP Tracking Direct

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SLIDE 6

Looking at the I-V/P-V Curve

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P

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SLIDE 7

Looking at the I-V/P-V Curve

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P

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SLIDE 8

Looking at the I-V/P-V Curve

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P

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SLIDE 9

Looking at the I-V/P-V Curve

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P = dV dP

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SLIDE 10

Looking at the I-V/P-V Curve

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P = dV dP > dV dP

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SLIDE 11

Looking at the I-V/P-V Curve

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P = dV dP > dV dP < dV dP

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SLIDE 12

Conductance relates to dP/dV

Conductance G = I / V

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SLIDE 13

Conductance relates to dP/dV

Conductance G = I / V dV dI V I dV IV d dV dP + = = ) (

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SLIDE 14

Conductance relates to dP/dV

If sampling steps are small enough: Incremental G Conductance G = I / V dV dI V I dV IV d dV dP + = = ) (

V I dV dI D D »

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SLIDE 15

Conductance relates to dP/dV

If sampling steps are small enough: Incremental G Conductance G = I / V dV dI V I dV IV d dV dP + = = ) (

V I dV dI D D » dP I I V dV V D » + D

Incremental Conductance

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SLIDE 16

Conductance relates to dP/dV

If sampling steps are small enough: Incremental G Conductance G = I / V dV dI V I dV IV d dV dP + = = ) (

V I dV dI D D » dP I I V dV V D » + D I I V V

  • =

Incremental Conductance VS Conductance

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SLIDE 17

Comparing G to Incremental Conductance

If

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SLIDE 18

Comparing G to Incremental Conductance

If

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SLIDE 19

Comparing G to Incremental Conductance

If

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SLIDE 20

Comparing G to Incremental Conductance

If

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SLIDE 21

Comparing G to Incremental Conductance

If

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SLIDE 22

Comparing G to Incremental Conductance

If

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SLIDE 23

Comparing G to Incremental Conductance

If

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SLIDE 24

Incremental vs Instant Conductance

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P = dV dP > dV dP < dV dP

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SLIDE 25

Incremental vs Instant Conductance

Voltage [V] Current [A] V I VMPP VOC ISC IMPP PMPP MPP Power [W] P

V I V I

  • =

D D

V I V I

  • <

D D V I V I

  • >

D D

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SLIDE 26

Block Diagram IC Algorithm

VPV(n+1) IPV(n-1,n) VPV(n-1,n)

  • ΔIPV / ΔVPV = -IPV / VPV (at MPP)
  • ΔIPV / ΔVPV > -IPV / VPV (left of the MPP)
  • ΔIPV / ΔVPV < -IPV / VPV (right of the MPP)

I V D D

I V

  • ?

IF > VPN(n+1)>VPN(n) IF < VPN(n+1)<VPN(n) IF = VPN(n+1)=VPN(n)

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SLIDE 27

Conceptual Flowchart

http://www.ni.com/white-paper/8106/en/ Increase Voltage Decrease Voltage Increase Voltage Decrease Voltage Start ΔI/ΔV > -I/V? ΔI/ΔV = -I/V? ΔI = 0? ΔI > 0? ΔV = 0? Return