Photovoltaic power generation and urban power grid parallel power supply switching device

A photovoltaic power generation and power supply switching technology, which is applied to circuit devices, electrical components, emergency power supply arrangements, etc., to achieve low cost, same frequency and same phase, and reliable switching effects

Inactive Publication Date: 2014-09-17
CHENGDU KEXING ELECTRIC APPLIANCE BRIDGE JOINT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]In the existing non-backflow photovoltaic power generation system, because there is no good switch control strategy to make the photovoltaic power supply parallel to the city grid and prevent its backflow, so As a result, it is difficult to switch, the operability is not high, and the circuit is complicated and the cost is high, so it is used less, so that the photovoltaic power has not been used more effectively

Method used

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  • Photovoltaic power generation and urban power grid parallel power supply switching device
  • Photovoltaic power generation and urban power grid parallel power supply switching device
  • Photovoltaic power generation and urban power grid parallel power supply switching device

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Embodiment Construction

[0035] The hardware unit of the present invention is as follows:

[0036] 1. AC switching unit : the main circuit of the present invention is made up of 4 insulated gate bipolar transistors Q1, Q2, Q3, Q4 and four antiparallel diodes D1, D2, D3, D4 therewith. In the first switching unit, Q1 and D1 are connected in antiparallel, and Q2 and D2 are connected in antiparallel. The negative terminal of Q1 is connected to the negative terminal of Q2, and the positive terminal of Q1 and the positive terminal of Q2 are respectively connected to the photovoltaic power supply and the load. In the second switching unit, Q3 and D3 are connected in antiparallel, and Q4 and D4 are connected in antiparallel. The negative terminal of Q3 is connected to the negative terminal of Q4, and the positive terminal of Q3 and the positive terminal of Q4 are respectively connected to the load and the city network. At the same time, the gates of the four IGBTs are all connected to the first driving u...

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Abstract

The invention is a parallel power supply switching device for photovoltaic power generation and city network, which solves the problems of the existing device, such as complex structure, high cost, poor anti-backflow performance during parallel power supply, and photovoltaic power supply can not always output maximum power. It includes AC switching unit, power supply unit, control unit, drive circuit, sampling conditioning unit, etc. The AC switching unit uses a pulse width modulation strategy and DSP software phase-locking technology to perform logic switching control through the control unit. The invention provides a good guarantee for the parallel power supply of photovoltaic power generation and city network without backflow.

Description

Technical field: [0001] The invention relates to a photovoltaic power generation and city network parallel power supply switching device in a photovoltaic power generation system without reverse flow. technical background: [0002] The existing photovoltaic power generation grid-connected systems can be divided into two categories, one is the countercurrent system, and the other is the non-countercurrent system. The countercurrent system means that the power generated by the solar array is not only supplied to the AC load, but the excess power is fed back to the grid. When the solar battery cannot meet the load requirements, it is directly powered by the grid. The non-backflow system means that when the power generation of the photovoltaic system is less than or equal to the power consumption of the load, the insufficient power is provided by the grid. [0003] In the existing non-backflow photovoltaic power generation system, because there is no good switch control stra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/00H02J9/06
CPCY02B10/72Y02B10/70
Inventor 胡天友胡蓉王敏陆明龙何应兵王仁昭唐德炜陈永祥
Owner CHENGDU KEXING ELECTRIC APPLIANCE BRIDGE JOINT CO LTD
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