Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 12, Pages 11553-11565Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2906259
Keywords
Differential power processing (DPP) converter; module-integrated converter (MIC); partial shading; photovoltaic system; quasi-Z-source inverter (qZSI)
Categories
Funding
- Power Academy
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Conventional microinverter or module-integrated converter (MIC)-based photovoltaic (PV) systems are prone to be complex and costly because each MIC requires not only a boost converter to bridge a huge voltage gap between a PV panel and grid but also desirably a differential power processing (DPP) converter to preclude partial shading issues. This paper proposes a novel MIC based on cascaded quasi-Z-source inverters (q7S1s) with DPP capability. A traditional qZSI and voltage multiplier (VM)-based DPP converter are integrated into a single unit with sharing active switches and magnetic components, achieving system- and circuitlevel simplifications. In addition, a novel control strategy utilizing two control freedoms of shoot-through duty cycle d(st) and modulation index M to simultaneously perform maximum power point tracking (MPPT) and DPP function, respectively, is also presented. A 150 W prototype for a standard PV panel consisting of three substrings is built, and experimental tests are performed emulating partial shading conditions. The results demonstrate that the proposed integrated qZSI could perform MPPT with satisfactory preventing partial shading issues while generating ac voltage at the inverter output.
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