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Flexible and efficient switched string converter

A technology of electric converters and electric switches, which is applied in the direction of output power conversion devices, conversion equipment without intermediate conversion to AC, collectors, etc., and can solve complex and huge design problems

Pending Publication Date: 2021-06-08
K B ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For example, converting a DC voltage from a photovoltaic element to an AC voltage for application to an AC grid typically requires multiple conversion stages, thus often resulting in a complex and bulky design

Method used

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  • Flexible and efficient switched string converter
  • Flexible and efficient switched string converter
  • Flexible and efficient switched string converter

Examples

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Embodiment Construction

[0081] figure 1 An embodiment of an electrical converter with two DC power banks (DCBs) DCB1 , DCB2 is shown. The converter is arranged to convert an electrical AC or DC input at the input terminal T_I into an electrical AC or DC output at the output terminal T_O. A switching device SWC or switching circuit with a plurality of controllable electrical switches controlled by a first control algorithm C1. The switching circuit SWC is controlled to establish an electrical connection between the input terminal T_I and the output terminal T_O and the two DCB1, DCB2 in an alternating manner so that DCB1 is charged by the connection to the input terminal T_I during one period of time and during the other. Discharge through connection to output terminal T_O for a period of time. The same applies to DCB2, which is connected to charge and discharge at the opposite time interval to DCB1. This can be realized with a rather simple switching circuit SWC, which requires only a few controll...

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PUM

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Abstract

The invention provides an electric converter for converting AC or DC input into an electric AC or DC output. A swap circuit with controllable electric switches serves to selectively swap connection of a plurality of DC power banks (DCBs) between an input terminal and an output terminal, thus selectively connecting the DCBs to an electric source or an electric load. The DCBs are formed as series of interconnected submodules (SMs) each having one or more electric energy storage elements (ESEs) and a switching circuit for selectively by-passing or connecting the ESEs. The ESEs can be capacitors, batteries, super capacitors, or a combination of these. By properly controlling the swap circuit and the switching of the SMs, such as by taking into account the dead-time for the electric switches involved, the converter can be used for DC-AC, DC-DC, AC-DC, or AC-AC conversion, allowing multilevel output. It can in some embodiments eliminate the need for an unfolding converter, and the converter provides a rather simple and efficient topology, suitable e.g. for connection of a DC input from a photovoltaic elements to an AC electric grid.

Description

technical field [0001] The present invention relates to the field of power electrical systems, and more specifically, the present invention provides a high efficiency electrical converter topology, for example for DC to AC conversion of electrical power from photovoltaic elements. This converter topology is easy to integrate with electrical energy storage elements such as batteries. Background technique [0002] Efficient electrical converters are important, for example, to convert electrical power from renewable energy sources such as photovoltaic elements or wind turbine generators. Furthermore, such a converter should be low-cost, compact and light-weight. [0003] For example, converting a DC voltage from a photovoltaic element to an AC voltage for application to an AC grid typically requires multiple conversion stages, thus often resulting in a complex and bulky design. The function of converting a DC input voltage to a higher AC output voltage is usually implemented ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07H02M7/483H02J7/00H02J3/38
CPCH02M3/07H02J7/0016H02J2300/20H02J3/381H02M7/4835Y02E10/56H02J2207/20H02J3/007H02M1/007H02M1/009H02M1/0095H02J7/02
Inventor 德若·塞拉拉斯洛·马特马蒂亚·里科
Owner K B ELECTRONICS INC