Transformer-free type single-phase photovoltaic inverter with mixed voltage clamping

A photovoltaic inverter and transformer technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as inability to completely eliminate common-mode leakage current, unbalanced heating of switching devices, and reduce the overall efficiency of the inverter. Small ripple, less switching times, and reduced loss

Inactive Publication Date: 2018-03-23
YANCHENG POWER SUPPLY CO STATE GRID JIANGSU ELECTRIC POWER CO +2
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This circuit is similar to the HERIC circuit and cannot completely eliminate the common mode leakage current
In addition, its circuit structure is asymmetrical, and the working hours of the five switching transistors are not equal, resulting in unbalan

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Transformer-free type single-phase photovoltaic inverter with mixed voltage clamping
  • Transformer-free type single-phase photovoltaic inverter with mixed voltage clamping
  • Transformer-free type single-phase photovoltaic inverter with mixed voltage clamping

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] In order to describe the present invention in more detail, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Such as figure 2 As shown, a transformerless single-phase photovoltaic inverter with voltage hybrid clamping includes: an energy storage voltage divider unit, a power inverter unit, a hybrid clamping unit, and a filter unit. among them:

[0031] The energy storage voltage divider unit is used to store energy and divide the input photovoltaic direct current to extract the midpoint voltage of the photovoltaic direct current output; in this embodiment, it includes a first input capacitor C dc1 , The second input capacitance C dc2 . Among them, the first input capacitance C dc1 The positive pole of the input DC terminal is connected to the positive pole of the input DC terminal, and the second input capacitor C dc2 The negative pole of is connected to the ne...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a transformer-free type single-phase photovoltaic inverter with mixed voltage clamping. The transformer-free type single-phase photovoltaic inverter comprises an energy storagevoltage dividing unit, a power inversion unit, a mixed clamping unit and a filter unit. When the inverter works, with the help of six diodes, five power switches with antiparallel diodes are cooperated to enable an alternating current side to be continuous and clamp common-mode voltage of the same to be half of direct current input voltage when the inverter outputs zero level, and thereby complete elimination of the common-mode voltage is achieved, and required bus voltage is only half of a half-bridge type circuit. Meanwhile, the transformer-free type single-phase photovoltaic inverter adopts a unipolar pulse width modulation mode, so that output current is small in ripple, volume and weight of a filter are reduced, and loss of a magnetic element is reduced at the same time; the switch operates less frequently in a switching period, so that switching loss is reduced; and therefore, the inverter provided by the invention is high in output efficiency that inversion efficiency up to 98%can be obtained.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a transformerless single-phase photovoltaic inverter with voltage hybrid clamping. Background technique [0002] Nowadays, the problems of energy depletion and environmental pollution are becoming more and more serious, and the development and utilization of various new energy sources are getting more and more attention. Solar energy is currently one of the cleanest and most promising renewable energy sources for large-scale development and utilization, and its photovoltaic utilization has attracted widespread attention from all over the world. Solar photovoltaic power generation is the main development trend of solar photovoltaic utilization, and it will develop more and more rapidly in the future. [0003] As the last or only energy conversion device in the photovoltaic power generation system, the inverter's efficiency and safety performance will directl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02M7/5387H02M1/12H02J3/38
CPCH02J3/383H02M1/12H02M7/53871H02M1/123Y02E10/56
Inventor 胡卫丰胥峥周红益胡志林
Owner YANCHENG POWER SUPPLY CO STATE GRID JIANGSU ELECTRIC POWER CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap