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Common positive electrode DC/DC converter and photovoltaic inverter system formed by common positive electrode groups of common anode DC/DC converter

A photovoltaic inverter and converter technology, applied in control/regulation systems, photovoltaic power generation, DC power input conversion to DC power output, etc., can solve the problems of being unable to adopt and suppress the PID effect of photovoltaic panels, and achieve the goal of suppressing the PID effect Effect

Pending Publication Date: 2021-08-27
SINENG ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the traditional negative grounding method cannot be used to suppress the PID effect of photovoltaic panels

Method used

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  • Common positive electrode DC/DC converter and photovoltaic inverter system formed by common positive electrode groups of common anode DC/DC converter
  • Common positive electrode DC/DC converter and photovoltaic inverter system formed by common positive electrode groups of common anode DC/DC converter
  • Common positive electrode DC/DC converter and photovoltaic inverter system formed by common positive electrode groups of common anode DC/DC converter

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Embodiment Construction

[0031] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0032] The terms "comprising" and "having" and any variations thereof in the description and claims of the present invention and the above descriptions of the drawings are intended to cover a non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present invention or the above d...

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Abstract

The invention discloses a common positive electrode DC / DC converter and a photovoltaic inverter system formed by the common positive electrode groups of the common positive electrode DC / DC converter. The common positive electrode DC / DC converter comprises a photovoltaic connecting unit, a switch control unit, an energy storage unit, a polarity output control unit and an inverter connecting unit, one end of the switch control unit and a bus positive electrode end of the inversion connection unit are both connected with a photovoltaic positive electrode end of the photovoltaic connection unit, a photovoltaic negative electrode end of the photovoltaic connection unit is connected with one end of the energy storage unit, and the other end of the energy storage unit and a negative electrode end of the polarity output control unit are both connected with the other end of the switch control unit. The positive electrode end of the polarity output control unit is connected with the bus negative electrode end of the inversion connection unit, the midpoint of the bus positive electrode end and the bus negative electrode end of the inversion connection unit is grounded, and the photovoltaic inversion system formed by the common positive group comprises a plurality of photovoltaic group strings, inversion units and at least one common positive electrode DC / DC converter. The common positive electrode DC / DC converter is applied to a photovoltaic inverter system of 1000V-3000V and higher voltage level, and effectively inhibits the PID effect of a photovoltaic panel.

Description

technical field [0001] The invention relates to the technical field of photovoltaic circuits, in particular to a common positive DC / DC converter and a photovoltaic inverter system formed by common positive groups thereof. Background technique [0002] With the continuous development of the photovoltaic industry, the power level of the inverter continues to increase, and reducing system costs and system losses has become an important research direction for the healthy and sustainable development of inverters. Up to now, the existing centralized, distributed and string inverters on the market mostly adopt the method of increasing the system voltage to reduce the system current, reduce losses and reduce costs. At the same time, as the voltage level of the photovoltaic inverter system is increased, the solution to suppress the PID effect (Potential Induced Degradation) of photovoltaic panels, also known as the potential-induced degradation effect, has become the focus of attenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02J3/38G01R31/52G01R31/08
CPCG01R31/086G01R31/52H02J3/381H02M3/156H02J2300/24Y02E10/56
Inventor 罗劼赵龙张林江宋英杰
Owner SINENG ELECTRIC CO LTD
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