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A cascaded h-bridge multilevel converter and its control method

A control method and multi-level technology, applied in the direction of adjusting electrical variables, control/regulation systems, converting DC power input to DC power output, etc., can solve problems such as unbalanced output power between phases

Active Publication Date: 2019-05-03
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] Purpose of the invention: In order to solve the problem of unbalanced output power between the phases and phases of the cascaded H-bridge converter in the large-scale photovoltaic grid-connected power generation system, the present invention proposes a cascaded H-bridge multi-level converter and its control method

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  • A cascaded h-bridge multilevel converter and its control method
  • A cascaded h-bridge multilevel converter and its control method
  • A cascaded h-bridge multilevel converter and its control method

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings.

[0050] 1. Circuit topology

[0051] The circuit topology schematic diagram of the present invention is as figure 1 As shown, it includes two passive DC buses and a conversion circuit with the same three-phase structure. When the cascaded H-bridge multilevel converter is connected to the three-phase power grid, the three-phase conversion circuits are connected in series to the three-phase power grid respectively. circuit, figure 1 The rightmost port in the figure is the access port connected to the three-phase power grid; the conversion circuit includes n cascaded inverter modules with the same structure, and n is the grid-connected voltage divided by the design value of the output voltage of each H-bridge unit Multiple, n is a positive integer; the inverter module includes: a photovoltaic sub-module and an H-bridge unit, wherein the photovoltaic sub-module is a three...

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Abstract

A cascaded H-bridge multilevel converter and its control method, the converter includes two passive DC buses and a conversion circuit with the same three-phase structure; the conversion circuit includes n cascaded inverter modules with the same structure ; The inverter module includes: photovoltaic sub-module and H-bridge unit, the photovoltaic sub-module is a three-port interleaved parallel Boost LLC DC converter, of the two input ports on the primary side of the photovoltaic sub-module, one input port is connected to the solar photovoltaic power generation module The output terminal of the photovoltaic sub-module is connected, and the other input port is connected across two DC buses; the output port of the photovoltaic sub-module is connected to the input port of the H-bridge unit; in each phase conversion circuit, the output ports of n H-bridge units are cascaded to form the The output port of the phase conversion circuit. The invention realizes the tracking of the maximum power point of the photovoltaic module and the output voltage control of the LLC DC converter by controlling the duty cycle of the switching tube and the switching frequency, so as to solve the problem of the in-phase and interphase output power of the cascaded H-bridge converter in the large-scale photovoltaic grid-connected power generation system. A matter of balance.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, and relates to a cascaded H-bridge multilevel converter for large-scale photovoltaic systems and a control method thereof. Background technique [0002] The rapid development of economy and society has made human beings' demand for energy continuously increasing. The development and utilization of renewable energy is crucial to the sustainable development of a country, and photovoltaics are considered to be the most promising renewable energy technology for development and application. one. In recent years, the application of large-scale photovoltaic grid-connected power generation systems has shown a growing trend worldwide. In order to connect photovoltaic units, improve the energy utilization rate of photovoltaics, and improve the reliability of photovoltaic systems, the development of power electronic converters suitable for photovoltaic systems has become a research hots...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/49H02M7/48H02M3/335H02J3/38
CPCH02J3/383H02M3/33569H02M7/4826H02M7/49H02M1/007Y02E10/56
Inventor 伍小杰王康安张帆石蒙刘锋马标张园明刘天宁柳军停伍葵修俊瑞
Owner CHINA UNIV OF MINING & TECH
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