Lecture 22 PV power converter 3

Lecture 22 PV power converter 3 - Isolated Boost DC-DC...

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EEE598–Raja Ayyanar Isolated Boost DC-DC Stage
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Single phase PV inverter with HF isolation DC DC stage provides galvanic isolation, low ripple input current and Maximum Power Tracking (in many cases multiple inputs and multiple MPPT); the dc dc stage injects maximum power into the dc link DC AC PWM stage controls output ac current and regulates dc link voltage
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+ Boost (step up) converter (Review) + i L + _ v L V in S 1 D 1 + _ v A i C I o + _ V o D q A A C R L q A 1 0 0 V o v A DT S ( 1-D ) T S ( 1-D ) V o ( ) ( ) since 0 1 (from waveform) Ai n L Ao vV v vD V == =- 1 1 o in V VD = - Input output relationship for Boost converter EEE598–Raja Ayyanar
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q A 1 0 V o v A t DT S ( 1-D ) T S 0 Boost converter–waveforms (Review) + i L + _ v L V in S 1 D 1 + _ v A i C I o + _ V o D q A A C R L i D A qD = ( ) 1 A o vD V =- v L V in -V o V in 0 1 in V m L = 2 in o VV m L - = i L 0 ( ) 1 o Li n I iI D == - Do = i D 0 i C 0 -I o EEE598–Raja Ayyanar () ( ) ( ) 10 11 1 1 in s in o s in o o in VD T V V DT D V D V +- - = +- = - = -
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Selection of L (Review) 0 v L V in -V o V in i L 0 L I D I in Consider the T ON interval () 1 L in o
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Lecture 22 PV power converter 3 - Isolated Boost DC-DC...

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