Novel photovoltaic modular multi-level converter and control method thereof
A modular multi-level, photovoltaic module technology, applied in photovoltaic modules, photovoltaic power generation, current collectors and other directions, can solve the problems of not simple enough rear-stage units, complex driving circuits, and increased switching loss of driving power switch tubes, etc., to reduce The effect of driving total power and switching losses, reducing switching devices, and improving reliability
Active Publication Date: 2016-01-06
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
As a result, the subsequent unit is not simple enough, the cost has not been reduced again, and the driving circuit is relatively complicated, which leads to an increase in the consumption of driving power and the switching loss of the switching tube.
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[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0038] A novel photovoltaic modular multilevel converter and its control method provided by the present invention control the working mode of the subsequent SM unit by collecting and sorting the capacitor voltages in each DC link, so as to realize the voltage balance at both ends of the voltage stabilizing capacitor And carry out medium and high voltage DC grid connection.
[0039] 1. New photovoltaic modular multilevel converter
[0040] Embodiments of the novel photovoltaic modular multilevel converter in the present invention...
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The invention provides a novel photovoltaic modular multi-level converter and a control method thereof. The photovoltaic modular multi-level converter comprises n sub-unit modules, wherein n is equal to or more than 2. The input end of each sub-unit module is connected with a photovoltaic component, and the output end accesses a direct current power grid. The method uses a capacitor voltage sorting method to control voltage balance of both ends of n voltage-stabilized capacitors in the modular multi-level converter. Compared with the prior art, the novel photovoltaic modular multi-level converter and the control method, which are provided by the invention, have the advantages that the control of the converter is easier; the efficiency of the converter is improved; switching devices are reduced; and total drive power and switching loss are reduced.
Description
technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a novel photovoltaic modular multilevel converter and a control method thereof. Background technique [0002] The current solar photovoltaic power generation is basically in the form of AC grid connection. Whether it is a centralized photovoltaic inverter or a distributed photovoltaic inverter, its output voltage is relatively low, mostly below 400V. DC distribution network, the output of the inverter needs to be boosted by an isolation transformer, and then rectified by the VSC before being incorporated into the DC distribution network. This system has the disadvantages of many equipments, large floor space, complex structure, and low conversion efficiency. In a common modular cascade-based photovoltaic power generation DC grid-connected system, the output of the photovoltaic array is connected to the half-bridge sub-module through an isolated DC converter, ...
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IPC IPC(8): H02S40/30H02J7/35
CPCH02M7/49Y02E10/56
Inventor 陶以彬杨波李官军胡金杭崔红芬冯鑫振曹远志周晨余豪杰刘欢赫卫国鄢盛驰庄俊李跃龙卢俊峰朱红保侯书毅
Owner CHINA ELECTRIC POWER RES INST