A method and system for controlling a grid-connected inverter
A control method and inverter technology, applied in the direction of single-network parallel feeding arrangement, photovoltaic power generation, etc., can solve the problems of inverter bus voltage reducing inverter efficiency, etc., and achieve the effect of solving inverter conversion efficiency
Active Publication Date: 2016-08-24
SUNGROW POWER SUPPLY CO LTD
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[0004] In view of this, the present invention provides a grid-connected inverter control method and system, which solves the technical problem of reducing inverter efficiency due to excessive inverter bus voltage in the prior art
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[0055]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0056] This application provides a grid-connected inverter control method and system. By monitoring the actual bus voltage of the inverter bus in real time, when it is judged that the absolute value of the first difference between the actual bus voltage and the target bus voltage is greater than When the first voltage threshold is used, the first difference is used to calculate the target current value of the inductance element in the inverter, wherein the targe...
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The invention provides a grid-connected inverter control method and device. The actual bus voltage of an inverter bus is monitored in real time, and when it is determined that the absolute value of a first difference value of the actual bus voltage and the target bus voltage is larger than a first voltage threshold, the target current value of an inductance element in an inverter is calculated through the first difference value, wherein the target bus voltage is the minimum voltage meeting the success inversion of the inverter; then, the current current of the inductance element is adjusted according to the target current value so that the absolute value of the difference value of the actual bus voltage and the target bus voltage can be not larger than the first voltage threshold, the occurrence that a capacitor connected to the inverter bus in parallel is damaged due to the fact that the voltage of the inverter bus is too high is avoided, and the problem that in the prior art, due to the fact that the voltage of the inverter bus is too high, the inversion conversion efficiency is reduced is solved.
Description
technical field [0001] The present invention relates to the technical field of inverters in photovoltaic grid-connected power generation systems, and more specifically, to a control method and system for grid-connected inverters. Background technique [0002] At present, in the photovoltaic grid-connected power generation system, when the PV voltage output by the PV panel is lower than the minimum inverter bus voltage required for inversion, in order to ensure that the inverter bus voltage reaches the minimum voltage required for inversion, the inverter In normal operation, a DC / DC converter is usually connected to the output end of the PV (Photo Voltaic, photovoltaic) panel to boost the PV voltage output by the PV panel, so that the processed voltage reaches the required level for the inverter. minimum voltage value. [0003] However, for this existing inverter, when the PV voltage output by the PV panel is greater than the minimum inverter bus voltage required for inversi...
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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 胡兵薛丽英柳萌张彦虎申潭
Owner SUNGROW POWER SUPPLY CO LTD