Ship photovoltaic power generation grid-connected system

Abstract

The invention provides a ship photovoltaic power generation grid-connected system. The system comprises a solar photovoltaic power generation device which is used for photovoltaic power generation, acapacitance filter which is connected with the solar photovoltaic power generation device and used for converting the pulse direct current output by the solar photovoltaic power generation device intosmooth direct current, an improved high-boost-ratio ship photovoltaic power generation grid-connected Z-source inverter which is a cascaded switch inductance type Z-source inverter and is used for modulating direct current into alternating current through SPWM pulse width modulation; the ship power grid is connected with the output end of the improved high-boost-ratio ship photovoltaic power generation grid-connected Z-source inverter. According to the improved high-boost-ratio grid-connected Z-source inverter ship photovoltaic power generation system, the change fluctuation of the current ship photovoltaic power generation output alternating voltage voltage is effectively reduced, the quality of the output alternating voltage voltage is improved, and the stability of ship grid connectionis ensured.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic power generation applications, in particular to a ship photovoltaic power generation grid-connected system. Background technique [0002] With the continuous increase of fuel prices and environmental pollution problems in the world today, the shipbuilding industry has paid more and more attention to green environmental protection and high-efficiency energy-saving technologies. Governments all over the world are vigorously developing and advocating new energy. Therefore, solar photovoltaic power generation technology has developed rapidly due to its clean, pollution-free, and less geographically affected advantages. At present, countries in the world attach great importance to the development of ship photovoltaic power generation grid-connected systems, and its development prospects are very broad. However, in ship photovoltaic power grid-connected systems, due to the obvious influence of external ...

AI Technical Summary

Problems solved by technology

At present, countries all over the world attach great importance to the development of ship photovoltaic power generation grid-connected systems, and its development prospects are very broad. It will inevitably lead to large fluctuations in the output AC voltage of the grid-connected system, so it is particularly important to select a suitable inverter in the ship photovoltaic power generation grid-connected system

[0003] Traditional marine photovoltaic inverters mainly include current source inverters and voltage source inverters. Traditional inverters have the disadvantage of only stepping down or boosting voltage, but the output voltage of photovoltaic power generation is affected by the environment. The fluctuation is relatively large, so the grid-connected inverter is required to have the ability to step up and down at the same time, so a DC-DC converter must be added in front of the traditional inverter if the traditional inverter is used, which results in a large number of power stages in the grid-connected system , low conversion efficiency, high cost, and poor reliability, and Z-source inverters have gradually replaced traditional Z-source inverters and are used in photovoltaic power generation systems due to their unique impedance structure.

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