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Non-isolated grid-connected converter, air-conditioning system and converter control method

A control method and converter technology, applied in the direction of conversion of AC power input to DC power output, high-efficiency power electronic conversion, single-network parallel feeding arrangement, etc., can solve the complex structure of photovoltaic air-conditioning system, high cost of photovoltaic air-conditioning system, control problems, etc. The method is cumbersome and other problems, to achieve the effect of compact structure, high quality of incoming network current, and reducing the number of components

Inactive Publication Date: 2015-12-23
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Photovoltaic air-conditioning systems using isolation transformers have disadvantages such as high cost, heavy weight, large volume, and low conversion efficiency.
The existing photovoltaic air-conditioning system with non-isolated structure without isolation transformer has complex structure, high cost, and cumbersome control methods

Method used

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  • Non-isolated grid-connected converter, air-conditioning system and converter control method
  • Non-isolated grid-connected converter, air-conditioning system and converter control method
  • Non-isolated grid-connected converter, air-conditioning system and converter control method

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Embodiment 1

[0030] This preferred embodiment discloses a non-isolated grid-connected converter, such as figure 1 As shown, the converter includes at least a rectification and inversion unit 3, which has bidirectional functions of rectification and inversion.

[0031] The rectification and inverter unit 3 includes a first capacitor C connected in series dc1 and a second capacitor C dc2 , the third switch tube S in series 3 , the fourth switch tube S 4 , the fifth switch tube S 5 and the sixth switch tube S 6 ; at the first capacitance C dc1 and a second capacitor C dc2 Node i is formed between the third switch tube S 3 and the fourth switching tube S 4 A node g is formed between them, and the fourth switching tube S 4 and the fifth switching tube S 5 A node a is formed between the fifth switch tube S 5 and the sixth switch tube S 6 Node h is formed between; a third clamping diode D is connected in series between node g and node h 3 and the fourth clamping diode D 4 , used to ...

Embodiment 2

[0040] The preferred embodiment discloses an air conditioning system. Such as Figure 9 As shown, the air-conditioning system includes an air-conditioning unit 4, a storage battery assembly 41, a capacitor branch 1, an interleaved switch unit 2, and the above-mentioned non-isolated grid-connected converter 5; wherein, the air-conditioning unit 4 includes a load air conditioner 42 (PMSM); the load air conditioner 42 The first terminal of the ground is grounded, and the second terminal is connected to the output terminal of the non-isolated grid-connected converter. The capacitor branch 1 and the interleaving switch unit 2 are integral structures.

[0041] Capacitor branch 1 includes filter capacitor C pv ;Filter capacitor C pv The positive pole of the solar cell is connected to the positive pole of the solar cell, and the negative pole is connected to the negative pole of the solar cell.

[0042] The interleaving switch unit 2 includes a first freewheeling diode D connected...

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Abstract

The invention discloses a non-isolated grid-connected converter, an air-conditioning system and a converter control method, which belong to the field of efficient grid-connected converters, and are designed for solving the problems of large size of the existing devices and the like. The non-isolated grid-connected converter at least comprises a rectifying and inverting unit, and has the bidirectional functions of rectification and inversion. The air-conditioning system comprises the non-isolated grid-connected converter. The control method based on the non-isolated grid-connected converter comprises a rectification mode. The non-isolated grid-connected converter adopts a bidirectional DC / AC converter to realize rectification, PFC and grid-connection functions, omits an isolation transformer, reduces number of devices, and is small in size. The air-conditioning system provided by the invention is small in size and higher in energy efficiency. The control method of the non-isolated grid-connected converter achieves the effects of low leakage current and high grid access current, can increase the voltage withstand level through rectification, reduces AC harmonic voltage and current, and increases power factors.

Description

technical field [0001] The invention relates to the field of high-efficiency grid-connected converters, in particular to a non-isolated grid-connected converter, an air-conditioning system including the non-isolated grid-connected converter, and a control method for the non-isolated grid-connected converter. Background technique [0002] Photovoltaic air conditioners are being used more and more due to reasons such as energy saving, environmental protection, and high-efficiency performance. At present, the grid connection of photovoltaic air conditioners mainly uses isolation transformers and non-isolation structures without isolation transformers to realize the power transmission from photovoltaic cells to the grid. [0003] Photovoltaic air-conditioning systems using isolation transformers have disadvantages such as high cost, heavy weight, large volume, and low conversion efficiency. The existing photovoltaic air-conditioning system with non-isolation structure without i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M1/12H02M1/42H02J3/38
CPCY02B70/10
Inventor 宋泽琳郭清风张有林
Owner GREE ELECTRIC APPLIANCES INC
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