Abstract
In order to decrease the performance effect of a single string in part of a photovoltaic (PV) array and increase the adaptive PV power generation, independent multiple series-connected PV strings are usually adopted in PV system projects to implement the input configuration. Besides, the conversion circuits with multipath inputs are required to be designed for the corresponding inverters to carry out the control algorithms. Since independent and parallel-connected modes exist for the PV string input in actual engineering projects, it is of great significance to effectively identify different PV inputs automatically for inverter inputs. In order to solve the problems of high hardware circuit requirements and complicated control algorithms in most of the existing control methods, a multiple PV string input type recognition method is proposed. Through the proposed software control algorithm, to realize automatically, accurately and quickly identify the external input connection type of the different photovoltaic strings under the external condition changes. The proposed method is free from increasing the inverter hardware cost, and it enhances the capability of identification and judgment. Moreover, experiments and engineering applications are implemented to verify the proposed control method.
Highlights
As a kind of renewable energy, photovoltaic (PV) power generation is widely used
In the mediumand small-scale distributed PV application engineering projects, parallel-connected multiple PV arrays or independent inputs are usually adopted for the purpose of reducing the effects on the power generation of the whole system caused by faults of a single component/PV array or shading
For the purpose of reducing the effects caused by using a single input PV string, the multipath PV string input mode is usually adopted
Summary
As a kind of renewable energy, photovoltaic (PV) power generation is widely used. In the mediumand small-scale distributed PV application engineering projects, parallel-connected multiple PV arrays or independent inputs are usually adopted for the purpose of reducing the effects on the power generation of the whole system caused by faults of a single component/PV array or shading. V) When the absolute value of the first difference is smaller than the set threshold, the input mode judgment is implemented after the PV inverter is powered on and loaded. Vi) If the absolute value of the first difference is smaller than the set threshold, the two PV strings are determined to be in the parallel-connected input mode. Ix) When the absolute value of second difference VPVset 2 is larger than the set threshold value as shown in Eq 5, the input modes of the ith and jth PV strings are determined to be independent. X) When the absolute value of the second difference is smaller than the second set threshold, it can be determined that the input modes of the ith and jth PV strings are the parallelconnected ones
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