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Controller suitable for grid-connected inverter and power supply method of secondary system

A power supply method and secondary system technology, applied in the direction of AC network load balancing, single-network parallel feeding arrangement, etc., can solve the problems of increased workload, low reliability, lack of voltage stabilization function, etc., to delay power outages time, ensuring reliability, and ensuring the effect of low voltage ride-through capability

Active Publication Date: 2014-02-12
NAVAL UNIV OF ENG PLA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The cheap backup UPS has only one output voltage source, low reliability, no voltage stabilization function, and long conversion time, which seriously affects the reliability of the grid-connected inverter. Although the performance of the online UPS is slightly better, the cost is relatively high. High, and still have reliability issues
[0005] Some UPSs do not have the function of power restart and over-discharge protection. When the power grid is out for a long time, the service life of the internal battery is likely to be reduced due to over-discharge. When the power grid is turned on again, the maintenance personnel of the power station are required to turn on the inverter one by one. The UPS power supply of the device not only increases the workload, but also has potential safety hazards

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  • Controller suitable for grid-connected inverter and power supply method of secondary system
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  • Controller suitable for grid-connected inverter and power supply method of secondary system

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 The shown embodiment 1, a controller suitable for grid-connected inverters disclosed in this embodiment, has three voltage output terminals, and the grid port 1 of the grid-connected inverter is sequentially connected with miniature circuit breakers, single-phase Power frequency transformer 201, single-phase uncontrolled rectifier bridge 301, several parallel electrolytic capacitors 401 and DC / DC converter 501; miniature circuit breaker controls on-off of the entire grid-connected inverter controller, single-phase power frequency transformer 201 Power is taken from the grid port 1 and converted into 220V AC, which is output through the first AC output terminal 6 and used to supply power to electrical equipment such as fans and heaters. At the same time, the 220V AC power obtained by the single-phase power frequency transformer 2...

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Abstract

The invention discloses a controller suitable for a grid-connected inverter and a power supply method of a secondary system. A transformer unit converts power grid voltage into alternating currents and then outputs the alternating currents through a first alternating current output end, the alternating currents are converted into direct currents through a rectification unit and a capacitor filtering unit and then are output to the capacitor filtering unit through a first direct current output end to be stored and filtered, and the direct currents are converted into second direct currents through a direct current conversion power source and then are output through a second direct current output end. The controller suitable for the grid-connected inverter and the power supply method of the secondary system are provided with at least three voltage output ends which respectively obtain 220V alternating direct voltage, 300V direct current voltage and 24V direct current voltage to supply power to various secondary devices in the grid-connected inverter, meanwhile, have an energy-storage function and keep stable voltage output of each output end.

Description

technical field [0001] The invention belongs to the field of electric energy conversion, and in particular relates to a controller suitable for a grid-connected inverter and a power supply method for a secondary system. Background technique [0002] As the core equipment of the new energy power generation system, the grid-connected inverter has become the key factor of the whole system in terms of its capacity, performance and cost. In order to meet the requirements of the power system for the low-voltage ride-through performance of the grid-connected inverter, the traditional grid-connected inverter usually uses an uninterruptible power supply (UPS) as the controller of the grid-connected inverter and the power supply of the secondary system. The uninterruptible power supply (UPS) as the controller of the grid-connected inverter and the power supply of the secondary system usually only has one voltage output terminal, and has the following disadvantages: [0003] New energ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/28
Inventor 吴振兴胡安周亮仲鹏峰揭贵生汪光森蔡信健孙乐武美娜刘娣
Owner NAVAL UNIV OF ENG PLA
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