Multi-input rectifying circuit for distributed power generation

A technology of distributed power generation and rectification circuit, which is applied in the directions of irreversible AC power input conversion to DC power output, AC power input conversion to DC power output, electrical components, etc., which can solve the problems of low cost efficiency and limited adjustment range, etc. achieve the effect of simple structure

Inactive Publication Date: 2010-09-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of conventional voltage regulation circuits not only increases the cost, but also lowers the efficiency, and its adjustment range is very limited.

Method used

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  • Multi-input rectifying circuit for distributed power generation
  • Multi-input rectifying circuit for distributed power generation
  • Multi-input rectifying circuit for distributed power generation

Examples

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Embodiment example

[0024] Application of multi-input rectifier circuit in wind turbine Figure 4 As shown in the dotted line box in the figure is the rectifier unit. The two generators are connected with the large gear of the wind turbine through an inscribed pinion, such as the one-shaft multi-machine speed-up wind turbine described in patent ZL 200720201210.2. During the rotation of the wind turbine, the two generators maintain synchronous speed. Each generator is a six-phase motor, in which three-phase outputs separated by an electrical angle of 120 degrees are connected to a rectifier unit, totaling four independent power sources.

[0025] Generally speaking, at low wind speeds, the output voltage of the wind turbine cannot reach the voltage level available for wind power generation, and the wind turbine can only work in the free-running mode, and this part of wind energy is wasted. After the multi-input rectification circuit is adopted, it is only necessary to close the semiconductor swit...

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Abstract

The invention discloses a multi-input rectifying circuit for distributed power generation, which is formed by connecting n rectifying units, wherein n is not less than 2; each rectifying unit comprises a bridge type rectifier, a second diode and a semiconductor switch; an alternating current input end of each bridge type rectifier is connected with a group of independent alternating current power supply; a positive output end at a direct current side is connected with one end of each semiconductor switch; a negative output end at the direct current side is connected with a positive electrode of the second diode; a negative electrode of the second diode is connected with the other end of the semiconductor switch and used as a positive output end of the rectifying unit; the second diodes of the n rectifying units are connected in series in sequence by the same polarity; positive output ends at the direct current sides of the bridge type rectifiers of adjacent rectifying units are respectively connected together through first diodes; and the polarities of the first diodes are consistent with the second diodes in the rectifying units. The rectifying unit has simple structure, can output relatively-stable direct current voltage under the condition that the input voltage substantially changes by dynamically changing an electric connecting structure of the rectifying units in the running and is applicable for a small-scale wind driven generator group.

Description

technical field [0001] The invention relates to a multi-input rectifier circuit for distributed power generation, which is suitable for power conversion devices for distributed power generation with large input voltage range changes, especially for wind power generation occasions. Background technique [0002] In recent years, affected by global climate change and rising oil prices, the use of renewable energy, including wind energy, solar energy, and biomass energy, has attracted the attention of the international community. Many countries have put forward clear development goals, making renewable energy utilization technologies keep improving. [0003] One of the difficulties in the utilization of renewable energy is that the input power varies widely. Therefore, for distributed power generation equipment, the first thing to face is that it needs to have good performance under a wide range of input voltages. For example, in actual wind power generation equipment, the win...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/162H02M7/17
Inventor 吕征宇姚文熙王仕韬张德华郑家龙
Owner ZHEJIANG UNIV
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