Impedance multi-module series photovoltaic DC boost converter

Abstract

The invention provides an impedance multi-module series photovoltaic DC boost converter. The impedance multi-module series photovoltaic DC boost converter comprises quasi-Z source impedance networks and full-bridge DC-DC converters, wherein the quasi-Z source impedance networks and the full-bridge DC-DC converters are cascaded to from a plurality of impedance power conversion units, input ends of the impedance power conversion units are used for connecting photovoltaic arrays, output ends of the impedance power conversion units are connected in series to acquire a DC high voltage, the impedance multi-module series photovoltaic DC boost converter also comprises a single- and dual-polarity conversion DC converter, and the output ends of the plurality of impedance DC-DC converter are connected in series and then are connected with an input loop of the single- and dual-polarity conversion DC converter. The impedance multi-module series photovoltaic DC boost converter has favorable expansibility and has potential engineering application value for future development and construction of a large-size DC photovoltaic power station and a power generation base in the nation.

Description

technical field [0001] The present invention relates to the circuit topology and operation control of an impedance converter, in particular to an impedance multi-module series photovoltaic DC boost converter. Background technique [0002] Photovoltaic power generation is one of the most important forms of new energy power generation at present, and it is the main force for my country to realize the replacement of renewable energy in the future. The distribution of light resources in my country and the pattern of the power system determine that large-scale construction and centralized grid connection will become an important form of photovoltaic development and utilization in the future. [0003] Photovoltaic power generation has the inherent characteristics of low power density, low export voltage, and large random fluctuations. It must be boosted and converged by the collection system to achieve grid-connected conditions. The traditional photovoltaic power station adopts t...

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Problems solved by technology

[0004] 1. The stability problem of multi-inverter parallel connection under the support of weak synchronization is prominent, and the voltage exceeds the limit and the wide frequency domain oscillation occurs frequently;

[0005] 2. The loss of the exchange and collection lines in the station and between stations is large, and the overall efficiency of the system is low

The DC-DC device selected in this document is a non-isolated DC-DC converter. The range of voltage gain that can be achieved by this converter is small. The module cannot realize the maximum power point tracking of photovoltaic

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