Photovoltaic grid-connected inverter MPPT (maximum power point tracking) efficiency test method and device

Abstract

The invention provides a photovoltaic grid-connected inverter MPPT (maximum power point tracking) efficiency test method and device and belongs to the photovoltaic power generation technical field. The method includes the following steps that: the output strategy of the voltage and current of a programmable direct-current power source is determined according to a preset irradiation change strategy; the programmable direct-current power source is controlled to output voltage and current to a photovoltaic grid-connected inverter to be tested according to the output strategy of the voltage and current, and photovoltaic array theoretical maximum output power values at various time sampling points are determined; the input voltage of the photovoltaic grid-connected inverter and the input current of the photovoltaic grid-connected inverter at the time sampling points are monitored; and the maximum power point tracking efficiency of the photovoltaic grid-connected inverter is determined according to the photovoltaic array theoretical maximum output power values at the various time sampling points, the input voltage and the input current of the photovoltaic grid-connected inverter at the time sampling points. With the method and device of the invention adopted, the problems of a long testing process and little possibility of comprehensively realizing static and dynamic maximum power point tracking efficiency testing in the prior art can be solved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a method and device for testing MPPT efficiency of a photovoltaic grid-connected inverter. Background technique [0002] At present, as the global climate problem is getting worse and the contradiction between energy supply and demand is intensifying, countries around the world are adjusting energy policies from the perspective of sustainable development and ensuring energy supply security, and incorporating new energy development into national development strategies. Solar energy has become a renewable energy power generation method because of its abundant resources, inexhaustibility, cleanness and safety. At present, large-scale and distributed grid-connected photovoltaic power plants have been widely used. [0003] In a photovoltaic power station, the photovoltaic grid-connected inverter is an important device that converts the direct current generated b...

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Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for testing the MPPT efficiency of photovoltaic grid-connected inverters, so as to solve the tedious test process in the prior art, and the maximum power point tracking efficiency test of grid-connected inverters is only for static maximum power Point tracking efficiency test, it is difficult to integrate static and dynamic maximum power point tracking efficiency test problems

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