Multi-path MPPT input mode determining method of photovoltaic inverter

• Main Authors: ZHENG HONGTAO, ZHANG YAO
• Format: Patent
• Language: Chinese; English
• Published: 27.02.2018
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROLLING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a multi-path MPPT input mode determining method of a photovoltaic inverter and relates to the technical field of power electronics. The method comprises the steps of collectinginput voltages and input currents of multi-path MPPTs in real time, obtaining the input voltages and input currents of any two MPPTs, determining the input mode according to the current input voltages of the two MPPTs before the photovoltaic inverter is powered on, setting parallel input as the default input in a startup phase of the photovoltaic inverter, controlling the input currents of one MPPT to change after the power is stabilized, determining the input mode according to the current input voltages of the two MPPTs, controlling the input currents of the two MPPTs to be the same in a normal working phase of the photovoltaic inverter, and determining the input mode according to the current input voltages of the two MPPTs. The method solves the problems of high hardware cost and easy determination and achieves