Transformerless power conversion in an inverter for a photovoltaic system
First Claim
1. A transformerless photovoltaic system comprising:
- a bipolar photovoltaic array; and
a full-bridge inverter electrically coupled to said bipolar photovoltaic array, said full bridge inverter comprising first and second legs arranged to energize at least two phases of a grid electrically coupled to said photovoltaic system, wherein switching signals applied to switching devices in each of said first and second legs may be adjusted relative to one other to reduce ripple current therein.
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Accused Products
Abstract
A transformerless photovoltaic system that may benefit from inverter topologies more suitable for ripple current cancellation techniques is provided. In one exemplary embodiment, the system may combine basic modules of straightforward inverter topologies to meet requirements for higher power applications and may comprise a bipolar photovoltaic array, and a full-bridge inverter electrically coupled to the bipolar photovoltaic array. The full bridge inverter may comprise first and second inverter legs that may be arranged to energize two phases of a grid electrically coupled to the photovoltaic system. In one exemplary embodiment, switching signals applied to switching devices in each of the first and second inverter legs may be adjusted relative to one other to reduce ripple current therein, thereby reducing the size of components used by the system.
110 Citations
10 Claims
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1. A transformerless photovoltaic system comprising:
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a bipolar photovoltaic array; and
a full-bridge inverter electrically coupled to said bipolar photovoltaic array, said full bridge inverter comprising first and second legs arranged to energize at least two phases of a grid electrically coupled to said photovoltaic system, wherein switching signals applied to switching devices in each of said first and second legs may be adjusted relative to one other to reduce ripple current therein. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A photovoltaic system comprising:
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a photovoltaic array; and
a full-bridge inverter electrically coupled to said photovoltaic array, said full bridge inverter comprising first and second legs arranged to energize at least two phases of a grid electrically coupled to said photovoltaic system, said full-bridge inverter further comprising a filter for removing ripple current that may be present in each of said first and second legs, said filter comprising a respective inductor in series circuit in each inverter leg and a common capacitor in a parallel circuit between said inverter legs. - View Dependent Claims (9, 10)
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Specification