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High conversion efficiency isolated micro grid-connected inverter and its control method

A control method and isolation technology, applied in high-efficiency power electronic conversion, control/regulation system, output power conversion device, etc., can solve the problem of not being able to guarantee operation at the maximum power point, and achieve the effect of improving conversion efficiency

Active Publication Date: 2020-06-12
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The maximum power point tracking of the system is carried out for the entire string, and it cannot guarantee that each component runs at the maximum power point

Method used

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  • High conversion efficiency isolated micro grid-connected inverter and its control method
  • High conversion efficiency isolated micro grid-connected inverter and its control method
  • High conversion efficiency isolated micro grid-connected inverter and its control method

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Embodiment Construction

[0039] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

[0040] In this embodiment, a high conversion efficiency isolated micro-inverter topology is proposed, such as figure 1 shown. The topology adopts a two-stage topology. The DC-DC part of the front stage is used to realize the maximum power tracking (MPPT) and boost function, and the DC-AC part of the latter stage converts DC into AC and sends it to the grid. The maximum power of the entire polar plate is generally less than 310W, and the maximum output power proposed by this patent is also 310W. According to the parameters of the plate, the open circuit voltage is generally lower than 60V. The inverter operating voltage range U PV Between 15-60V. The DC-DC part will U PV The voltage rises to U out (probably 400V) or so. The working principle of the DC-DC part is introduced below. The DC-DC part adopts a boost soft switching scheme based on resona...

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Abstract

The invention discloses an isolated micro grid-connected inverter with high conversion efficiency and a control method thereof, belonging to the technical field of micro inverters. The purpose is to provide a high conversion efficiency isolated micro grid-connected inverter to realize maximum power tracking and voltage boosting functions. High conversion efficiency isolated micro grid-connected inverter, including input terminal, DC-DC part, DC-AC part, the DC-DC part includes main switch tube, auxiliary switch tube, boost inductor, isolation transformer, resonant inductor , Resonant capacitor, first rectifier diode, second rectifier diode, first secondary capacitor, second secondary capacitor, clamp capacitor, parasitic capacitor, parasitic diode, anti-parallel diode. The inverter and the method thereof provided by the invention improve conversion efficiency, realize maximum power tracking and voltage boosting functions, and ensure that each component operates at the maximum power point.

Description

technical field [0001] The invention discloses an isolated micro grid-connected inverter with high conversion efficiency and a control method thereof, belonging to the technical field of micro inverters. Background technique [0002] With the advantages of high efficiency, flexible expansion, and easy installation of distributed photovoltaic grid-connected systems, small and medium power photovoltaic grid-connected power generation has become a research hotspot. [0003] Common photovoltaic grid-connected power generation system structures include centralized and distributed systems. There are series or parallel connection of photovoltaic modules in use. The characteristics of each photovoltaic cell are different from each other due to factors such as manufacturing errors of photovoltaic modules, different installation tilt angles, different orientations, different degrees of aging, and partial shading. The maximum power point tracking of the system is performed for the en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M3/335H02J3/38
CPCH02J3/385H02M3/33569H02M7/48H02M1/0058H02M7/4815Y02B70/10Y02E10/56
Inventor 张志
Owner DONGGUAN UNIV OF TECH