Abstract
This paper introduces an enhanced differential power processor topology and principle of operation for photovoltaic (PV) systems that is based on switched-capacitor technology, featuring local maximum power point tracking (MPPT) capability, zero current switching, high efficiency over wide-operation range, and reduced size. The new converter operates as a voltage-dependent current-source and is regulated by dead-time or frequency control. Local MPPT on the individual PV elements is realized and the operation is demonstrated by simulation and experiments. Differential power processing operation is verified using 150-W prototypes, demonstrating ultimate improvement in the power harvesting capability of above 90% and up to 99% out of the available power in the string, under different insolation levels.
| Original language | English |
|---|---|
| Article number | 6837444 |
| Pages (from-to) | 883-892 |
| Number of pages | 10 |
| Journal | IEEE Journal of Emerging and Selected Topics in Power Electronics |
| Volume | 2 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1 Dec 2014 |
Keywords
- Differential power processing
- digital control
- gyrator
- local control
- maximum power point tracking (MPPT)
- photovoltaic power
- renewable energy
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
