Method and system for reducing series-parallel mismatch loss of a photovoltaic group

Abstract

The invention discloses a method and a system for reducing series-parallel mismatch loss of a photovoltaic group. The series-parallel mismatch loss of the photovoltaic group is reduced at low cost. The method comprises the following steps of acquiring a working current of each photovoltaic string which is connected in parallel to the same path of MPPT (Maximum Power Point Tracking); the actual support angle and the optimal support angle of the photovoltaic string with the minimum working current being determined; the optimal support angle refering to the corresponding support angle when the solar radiation amount on the photovoltaic string reaches the maximum; judging whether the deviation between the actual bracket angle and the optimal bracket angle of the photovoltaic group string with the minimum working current exceeds a threshold value or not, and if so, on the premise that the working current of the photovoltaic group string with the minimum working current does not exceed the working current of the photovoltaic group string with the maximum working current, stopping the operation of the photovoltaic group string with the maximum working current; and adjusting the actual bracket angle of the photovoltaic string with the minimum working current to reduce the deviation between the actual bracket angle and the optimal bracket angle.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, and more specifically, relates to a method and system for reducing the mismatch loss of parallel connection of photovoltaic groups. Background technique [0002] Parallel mismatch of photovoltaic strings refers to the fact that multiple photovoltaic strings are connected in parallel to the same MPPT (Maximum Power Point Tracking) of the inverter, but since the maximum power point voltage of each photovoltaic string cannot be completely Consistent, some PV strings cannot work at the maximum power point, resulting in power loss. Contents of the invention [0003] In view of this, the present invention provides a method and system for reducing the mismatch loss of the parallel connection of photovoltaic groups, and realizes the reduction of the mismatch loss of the parallel connection of photovoltaic groups at a lower cost. [0004] A method for reducing mismatch los...

AI Technical Summary

Problems solved by technology

[0002] Parallel mismatch of photovoltaic strings refers to the fact that multiple photovoltaic strings are connected in parallel to the same MPPT (Maximum Power Point Tracking) of the inverter, but since the maximum power point voltage of each photovoltaic string cannot be completely Consistent, resulting in some photovoltaic strings unable to work at the maximum power point, resulting in power loss

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