DC bus distributed MPPT photovoltaic power generation system

Abstract

The invention discloses a DC bus distributed MPPT photovoltaic power generation system. The system comprises a photovoltaic cell array, a DC conflux boosting unit, a grid-connected inverter unit and an AC boosting unit, wherein the photovoltaic cell array, the DC conflux boosting unit, the grid-connected inverter unit and the AC boosting unit are connected in sequence; the photovoltaic cell array is composed of one or more cell arrays; the DC conflux boosting unit is composed of one or more DC power sources, and the intelligent DC power sources are used for boosting variable photovoltaic cell voltages sent by the photovoltaic cell array into stable high voltages; the grid-connected inverter unit comprises an inverter and is used for stabilizing output voltages of the DC conflux boosting unit and being responsible for start and stop of the working logic of the whole system; the AC boosting unit comprises a transformer. The DC bus distributed MPPT photovoltaic power generation system has the advantages of being simple in structure, low in cost, capable of improving the overall efficiency and the like.

Description

technical field [0001] The invention mainly relates to the technical field of photovoltaic power generation, in particular to a distributed MPPT photovoltaic power generation system based on a DC bus. Background technique [0002] With the continuous aggravation of the energy crisis and the increasingly serious climate and environmental problems, the development and utilization of new energy sources is imminent. Photovoltaic power generation is an effective way to utilize solar energy. It has the advantages of safety, reliability, no noise, no pollution, and free access. These advantages are incomparable to other power generation methods. Photovoltaic grid-connected power generation system refers to the conversion of sunlight into DC power by solar cell components, and then converts the DC power into AC power with power quality that meets the needs of the grid through an inverter, and finally connects to the grid through a step-up transformer or directly. Due to the high pr...

AI Technical Summary

Problems solved by technology

At present, in order to realize the multi-channel MPPT function, string inverters with a power level below 30KW are used to build photovoltaic power stations. Since the installed capacity of large photovoltaic power stations is mostly above 10MW, the same photovoltaic power station needs to use hundreds or even thousands of inverters. The parallel connection of series photovoltaic grid-connected inverters increases the difficulty of power dispatching, and photovoltaic grid-connected inverters are power electronic devices, which will cause certain harmonic interference to the power grid, and the parallel connection of multiple inverters will aggravate harmonic pollution The degree of harm increases the cost of harmonic control

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