Module-Integrated Power Electronics for Solar Photovoltaics. Robert Pilawa-Podgurski Power Affiliates Program 33rd Annual Review Friday, May 4th 2012

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1 Module-Integrated Power Electronics for Solar Photovoltaics Robert Pilawa-Podgurski Power Affiliates Program 33rd Annual Review Friday, May 4th 2012

2 Solar Photovoltaic System Challenges

3 Solar Photovoltaic Challenges - Residential Credit: Inter Solar Credit: SolarEdge Credit: Consumer Energy Reports Solar panel mismatch Shading by external structures Self shading Dirt Aging Orientation Panel manufacturing Lower energy capture Weakest link limits overall performance

4 Solar Cell Characteristics Need to operate solar cell at maximum power point (MPP) MPP varies greatly with insolation Each cell is very low voltage Some series-stacking is necessary

5 Standard PV System Architecture Advantages Efficient power electronics Low cost High reliability (per unit) Disadvantages Reduced energy capture No diagnostics Safety issues

6 Distributed Power Electronics Advantages Each panel operates at optimum point Inherent voltage stacking - can use high efficiency inverter Diagnostics and Safety Disadvantages Higher cost Some energy lost in power electronics Control challenges?

7 Challenges of Per Panel MPPT Poor Efficiency High cost High voltage ( V) power electronics Low switching frequency to minimize loss Bulky passive components Extra components Expensive enclosures Internal Panel Mismatch Partial shading across single panel leads to reduced energy capture

8 Single Panel Mismatch Panel is not producing maximum power internal panel mismatch

9 Sub-Module MPPT

10 Panel Integrated Sub-Module MPPT Increased energy capture Fully integrated into existing junction boxes Reduced cost Low (<15 V) voltage power electronics Work with conventional inverter Drop-in smart panel All intelligence resides in the local power electronics

11 Experimental Hardware Experimental evaluation Small enough to place in junction box Isolated individually addressable (I2C) converters for evaluation of algorithms and performance Bypass mode to collect empirical data

12 Control Algorithm All converter in series share the same current Maximize individual power by maximizing output voltage Perturb and Observe Perform startup sweep to locate approximate MPP Global MPPT No feedback Utilize inverter MPPT algorithm to find best operating point 1-bit feedback Inverter reduces current until strongest MPPT runs at full duty cycle Feedback possible through existing wiring

13 System Setup

14 Partial Shading

15 Static Evaluation

16 Static Evaluation

17 Static Evaluation

18 Static Evaluation No Shading

19 Dynamic Evaluation October 6th, 2011

20 Dynamic Evaluation

21 Inverter Control

22 Performance Evaluation [1] L. Linares et al. Improved Energy Capture in Series String Photovoltaics via Smart Distributed Power Electronics, APEC 2009 [2] G.R. Walker and P.C. Sernia Cascade DC-DC Converter Connection of Photovoltaic Modules, IEEE Transactions on Power Electronics, July 2004 Figure of Merit: $ spent per additional Watt (average) Assume 10% increase in energy capture by dc-dc optimizer Assume additional 5 % energy capture by sub-panel tracking Typical cost of installed solar PV ~ $5/Watt ($8/Watt in 2009)

23 Current Work Pursue Integration Phase-shifted operation Improved Algorithms One controller for many converters Reduce size of components Intelligent bypass detection Higher Efficiency Distributed control Work with existing inverters Lower Cost Reduce number of components Lower cost Higher efficiency (custom MOSFETs) Automatic global MPPT operation No global controller Diagnostics and Safety Benefits Communication without additional wires Added Functionality

24 Conclusions Photovoltaic Intelligent Distributed Power Electronics Intelligent localized tracking Low voltage connection Higher efficiency Smaller size Lower cost No local maximum problems Inverter can operate at optimum point Further testing to verify plug-and-play operation with conventional inverters Experimental results Static testing shows improved energy capture Dynamic testing illustrates potential gain in shaded situations

25 The End Questions?

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