Power matching method
First Claim
1. A method of matching the power of a photovoltaic system producing electric energy by which a working point at which the system produces maximum power is set by changing the working point in an MPP matching process and by comparing the system power, which changes as a result thereof, characterized in that at least one additional control step or control cycle is performed for detecting an external meteorological impact on a photovoltaic generator that causes a sudden strong reduction in sun irradiation, andthat said at least one control step or said at least one control cycle is integrated in said MPP matching process,it being checked in at least one control step or in at least one control cycle whether the generator characteristic curve has changed under the meteorological impact during one MPP matching cycle and a new working point being set in at least one correction step or in at least one correction cycle as a function of the change in position of one reference point so that during the MPP matching process the power point changed under the impact of external meteorological conditions is tracked so as to set a working point at which the system produces more power.
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Abstract
A method of matching the power of a photovoltaic system producing electric energy by which a working point at which the system produces maximum power is set by changing the working point in an MPP matching process and by comparing the system power, which changes as a result thereof, is intended to be suited both for stationary characteristic curves and for non stationary generator characteristic curves and to be easy to carry out so that the best working point is always set, even when the system is subjected to external interfering factors. This is achieved in that one or several additional control steps or control cycles are performed in order to track during the matching process a power point changing under external impact for a working point of even higher power to be set.
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Citations
12 Claims
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1. A method of matching the power of a photovoltaic system producing electric energy by which a working point at which the system produces maximum power is set by changing the working point in an MPP matching process and by comparing the system power, which changes as a result thereof, characterized in that at least one additional control step or control cycle is performed for detecting an external meteorological impact on a photovoltaic generator that causes a sudden strong reduction in sun irradiation, and
that said at least one control step or said at least one control cycle is integrated in said MPP matching process, it being checked in at least one control step or in at least one control cycle whether the generator characteristic curve has changed under the meteorological impact during one MPP matching cycle and a new working point being set in at least one correction step or in at least one correction cycle as a function of the change in position of one reference point so that during the MPP matching process the power point changed under the impact of external meteorological conditions is tracked so as to set a working point at which the system produces more power.
Specification