SERIS PID Recovery Novel method for Industry

Transcription

1 SERIS PID Recovery Novel method for Industry Daren POH, Kenneth GOH PV Module Testing Group Solar Energy Research Institute of Singapore (SERIS) National University of Singapore (NUS) SNEC Scientific Conference 29 May

2 PID Recovery Outline Rationale of study Present PID Recovery Methods Proposed SERIS PID Recovery Method SERIS PID Recovery Method Results Potential benefit How SERIS can help 2

3 Rationale of study PID impact and recovery research activity High Potential difference across solar cell and grounding Causes of PID 3

4 Rationale of study PID impact and recovery research activity Power (Pmax) loss between 5-50% Reversible vs Irreversible PID recovery initiated at SERIS Irreversible: PID corrosion Reversible: Likely shunting 4

5 Present PID Recovery Method 1 Proper grounding of solar array Source: 5

6 Present PID Recovery Method 2 PID Box - opposite bias applied at night Day Night 6

7 SERIS PID Recovery Method Influencing factors Temperature of module as high as 70 degc! Irradiation to module helps in recovery Power supply Constant current: Impp Current flow into module(s) as per normal string connection Shading of affected cell(s) in module Experiments with shading appears to be helpful in recovery. 7

8 SERIS PID Recovery Results Module 1 recovery Before Recovery: 238 W After recovery: 265 W Recovery of 8.8% 8

9 SERIS PID Recovery Results Module 2 recovery Before Recovery: 220 W After recovery: 252 W Recovery of 10.6% 9

10 SERIS PID Recovery Results 10

11 Potential benefit of this approach PID scenario How can system integrator act? 1. Identify 2. Shade 3. Monitor V V 11

12 How SERIS can help Identify defective modules down to cells within modules via PV System Doctor / system diagnostics. Perform recovery activity and monitor system performance SERIS module test lab can characterize the rate of recovery from sampled affected modules 12

13 Q&A? 13

14 OSA Light, Energy and the Environment Congress 5-8 Nov 2018, Resorts World Sentosa, Singapore The Scientific Congress comprises five Topical Meetings: Fourier Transform Spectroscopy (FTS): Hyperspectral Imaging and Sounding of the Environment (HISE): Optics and Photonics for Energy & the Environment (E2): Optics for Solar Energy (SOLAR): Solid-State Lighting (SSL): 14

15 OSA 2018 Local Organising Chair and Program Chairs from SERIS Prof Armin ABERLE CEO, SERIS NUS Local Organising Chair of OSA 2018 Dr Serena Fen LIN Head of Tandem Solar Cell Group, SERIS, NUS Program Chair of subprogram Optics in Solar Energy (SOLAR) Dr Wilfred WALSH Head of Solar Potential and Energy Meteorology Group, SERIS, NUS Program Chair of subprogram Optics and Photonics for Energy & the Environment (E2) 15

16 ACES 2017 Statistics Co-Located Events bit.ly/seasfb #ACES2018

17 bit.ly/seasfb #ACES2018

18 Thank you for your attention! Contact: sg More information at We are also on: 18