Photovoltaic high-voltage and direct-current series grid-connected system comprising dynamic voltage compensator

Abstract

The invention provides a photovoltaic high-voltage and direct-current series grid-connected system comprising a dynamic voltage compensator. The photovoltaic high-voltage and direct-current series grid-connected system comprises a plurality of photovoltaic direct-current grid-connected inverters and at least one dynamic voltage compensator, wherein input ends of the plurality of photovoltaic direct-current grid-connected inverters are independent and output ends are connected in series; the input ends of the plurality of photovoltaic direct-current grid-connected inverters are connected with a photovoltaic module respectively; and the output ends of the plurality of photovoltaic direct-current grid-connected inverters are connected in series and are connected with the input end of the dynamic voltage compensator in series. Through coordination and cooperation of the dynamic voltage compensator and the photovoltaic direct-current grid-connected inverters, the probability that the photovoltaic direct-current grid-connected inverters enter a power limiting mode; the generating capacity of the photovoltaic system is improved; and output voltage exceeding of the photovoltaic direct-current grid-connected inverters caused by power fluctuation of the photovoltaic module is overcome.

Description

technical field [0001] The invention relates to photovoltaic power generation equipment, in particular to a photovoltaic grid-connected device connected to a high-voltage direct current transmission system. Background technique [0002] The use of renewable energy to generate electricity to replace fossil energy is a common choice for all countries. Photovoltaic power generation, as an important form of renewable energy power generation, has attracted more and more attention due to its characteristics of cleanliness, environmental protection and flexible utilization, and its installed capacity has developed rapidly in China. During the national "Twelfth Five-Year Plan" and the "Thirteenth Five-Year Plan", great attention has been paid to it. [0003] Since the late 1990s, foreign companies have conducted research on light direct current transmission technology, which uses voltage source converters that can turn off devices to replace current source converters in traditional...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the disadvantages of complex control, low reliability, and easy introduction of high voltage to the low-voltage system of the photovoltaic HVDC power transmission system outputting series topology in the prior art, and propose a photovoltaic HVDC series grid-connected system containing a voltage dynamic compensator system

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