CN104796032B - Air-conditioning system - Google Patents

Air-conditioning system Download PDF

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Publication number
CN104796032B
CN104796032B CN201410025940.6A CN201410025940A CN104796032B CN 104796032 B CN104796032 B CN 104796032B CN 201410025940 A CN201410025940 A CN 201410025940A CN 104796032 B CN104796032 B CN 104796032B
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China
Prior art keywords
transistor
power
air
conditioning system
grid
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CN201410025940.6A
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Chinese (zh)
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CN104796032A (en
Inventor
邹金龙
褚川川
吴超
奚明耀
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201410025940.6A priority Critical patent/CN104796032B/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

The present invention provides a kind of air-conditioning system, including power conversion unit and current transformer, the input of the power conversion unit is connected to three-phase alternating-current supply, the output end of the input connection power conversion unit of the current transformer, the output end output DC voltage of the current transformer, is loaded for connecting.The air-conditioning system of the present invention, realizes that the power factor of grid side is controllable, can be controlled in unity power factor.

Description

Air-conditioning system
Technical field
The present invention relates to field of air conditioning, more particularly to a kind of air-conditioning system of braking energy feedback.
Background technology
In existing frequency-conversion air-conditioning system, uncontrollable power electric component is used in rectifying part, it is impossible to realize With exchanging for the system capacity of power network, especially in the state of motor brake, motor becomes generator, in generating shape State, the electricity sent so can only easily damage electric capacity, influence the operation of system to storing on the electric capacity of DC side.Meanwhile so System can not control the power factor of grid side, it is impossible to improve power factor, suppress harmonic wave.
The content of the invention
In view of the present situation of prior art, it is an object of the invention to provide a kind of air-conditioning system, the power of grid side is realized Factor is controllable.To achieve the above object, technical scheme is as follows：
A kind of air-conditioning system of braking energy feedback, including power conversion unit and current transformer；
The input of the power conversion unit is connected to three-phase alternating-current supply, described in the input connection of the current transformer The output end of power conversion unit, the output end output DC voltage of the current transformer, is loaded for connecting.
More preferably, described air-conditioning system also includes inductance, the inductance be connected on the power conversion unit with it is described Between current transformer.
More preferably, the current transformer includes the first transistor, second transistor, third transistor, the 4th transistor, the 5th Transistor, the 6th transistor and electric capacity；The source electrode connection described three of the emitter stage of the first transistor, the second transistor First phase of cross streams power supply, the emitter stage of the third transistor, the source electrode connection described three of the 4th transistor are intersecting The second phase of power supply is flowed, the emitter stage of the 5th transistor, the source electrode of the 6th transistor connect the three-phase alternating current The third phase in source, the source electrode of the first transistor, the source electrode of the third transistor, the source electrode of the 5th transistor and institute The first end for stating electric capacity connects altogether, the emitter stage of the second transistor, the emitter stage of the 4th transistor, the 6th crystal Second end of the emitter stage of pipe and the electric capacity connects altogether.
More preferably, the first transistor, second transistor, third transistor, the 4th transistor, the 5th transistor and Six transistors are npn type bipolar transistor.
More preferably, the current transformer also includes even resistance, and the equalizing resistance is in parallel with the electric capacity.
More preferably, described air-conditioning system also includes controller, the grid of the first transistor, the second transistor Grid, the grid of the third transistor, the grid of the 4th transistor, the grid of the 5th transistor, described The grid of six transistors electrically connects with the controller.
More preferably, the inductance is integrated on the transformer of the power conversion unit.
More preferably, the load is compressor or/and fan electromotor.
More preferably, the voltage of the three-phase alternating-current supply is less than the DC voltage that the output end of the current transformer exports.
The beneficial effects of the invention are as follows：
The air-conditioning system of the present invention, power conversion unit output three-phase alternating current export direct current after current transformer rectification, By the control of current transformer, realize that the power factor of grid side is controllable, general control is humorous in unity power factor, grid side electric current Ripple content is small and energy can feedback；The rectifier bridge of current transformer uses six transistors controlled entirely, and current transformer is worked with PWM mode, Quadergy is stored and exchanged by electric capacity, realizes stable middle dc voltage in full power range；Power conversion unit with Series inductance between current transformer, strobes to electric current, reduces electric current higher hamonic wave.
Brief description of the drawings
Fig. 1 is the circuit diagram of the air-conditioning system of the present invention；
Fig. 2 is the working condition change schematic diagram of air-conditioning system shown in Fig. 1.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples pair The air-conditioning system of the present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used for explaining The present invention, it is not intended to limit the present invention.
Reference picture 1, the embodiment of air-conditioning system one of the invention include power conversion unit A1, B1, C1 and current transformer；
Power conversion unit A1, B1, C1 input are connected to three-phase alternating-current supply, three-phase Y connections, neutral point n, institute Input connection power conversion unit A1, B1, C1 of current transformer output end are stated, the output end of current transformer exports DC voltage, Being loaded for connecting, the load is compressor or/and fan electromotor, wherein, the voltage of three-phase alternating-current supply is less than current transformer Output end output DC voltage.
The series inductance L between power conversion unit A1, B1, C1 and current transformer, inductance L are alternatively reactor, and inductance L is used In storage energy, while electric current is strobed, reduce electric current higher hamonic wave.Preferably, inductance L can be integrated in power conversion On the transformer of unit.
Current transformer includes the first transistor Sa, second transistor S'a, third transistor Sb, the 4th transistor S'b, the 5th Transistor Sc, the 6th transistor S'c and electric capacity C；
First phase (a of the first transistor Sa emitter stage, second transistor S'a source electrode connection three-phase alternating-current supply Phase), third transistor Sb emitter stage, the 4th transistor S'b source electrode connect the second phase (b phases) of three-phase alternating-current supply, the The third phase (c phases) of five transistor Sc emitter stage, the 6th transistor S'c source electrode connection three-phase alternating-current supply, first crystal Pipe Sa source electrode, third transistor Sb source electrode, the 5th transistor Sc source electrode and electric capacity C first end connect altogether, the second crystal Pipe S'a emitter stage, the 4th transistor S'b emitter stage, the 6th transistor S'c emitter stage and electric capacity C the second end connect altogether. Preferably, the first transistor Sa, second transistor S'a, third transistor Sb, the 4th transistor S'b, the 5th transistor Sc and Six transistor S'c are npn type bipolar transistor.Electric capacity C is used to aid in stablizing middle dc voltage, quadergy storage and friendship Change.
As a kind of embodiment, current transformer also includes even resistance R, and equalizing resistance R is in parallel with electric capacity C.
The air-conditioning system of braking energy feedback also includes controller（It is not shown）, the first transistor Sa grid, the second crystalline substance Body pipe S'a grid, third transistor Sb grid, the 4th transistor S'b grid, the 5th transistor Sc grid, the 6th Transistor S'c grid electrically connects with the controller.
Rectifier bridge is using IGBT (Insulated Gate Bipolar Transistor, abbreviation IGBT, the insulation controlled entirely Grid bipolar transistor), rectification, inversion energy back are realized in the control to IGBT, dynamic caused in blower motor, compression mechanism It can measure and feed back to power network, energy-saving and emission-reduction.The control to power factor is realized by inductance L and IGBT control simultaneously：
Current transformer is voltage converter, and voltage converter is worked with PWM mode, also referred to as pulse rectifier, Current transformer as boost topology.
The Air-condition system control pattern of braking energy feedback is as shown in Fig. 2 be rectification state by A to B, when between AB, Active and lagging reactive power is absorbed from power network；It is rectification state by B to C, when between BC, absorbs active and capacitive from power network Reactive power；It is inverter mode by C to D, when between CD, to electrical grid transmission is active and capacitive reactive power；It is inverse by D to A Change state, when between DA, to electrical grid transmission is active and lagging reactive power.
Current transformer also includes gate leve drive circuit, overcurrent sensing circuit and various monitoring for protection circuits.Power supply short circuit mould Under formula, transformer current directly flows into negative pole, equivalent to power supply short circuit without overload from positive pole.Now transformer energy to Reactor shifts, and it is increasing to flow through the electric current of reactor, so as to carry out energy stores, controls corresponding switching component to turn off When, reactor both ends just induce a very high voltage, the voltage and transformer voltage superposition, are charged jointly to intermediate loop And lifting voltage, it is small to the adverse effect of power network although control difficulty increase compared with diode or phase control rectifier pattern It is more, it is often more important that be easy to implement energy feedback.
The air-conditioning system of the braking energy feedback of above example, realize that grid side power factor is controllable, general control exists Unity power factor；Grid side current harmonic content is small, stable middle dc voltage in full power range, and energy can feedback.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (6)

  1. A kind of 1. air-conditioning system, it is characterised in that：
    Including power conversion unit and current transformer；
    The input of the power conversion unit is connected to three-phase alternating-current supply, and the input of the current transformer connects the power The output end of converter unit, the output end output DC voltage of the current transformer, is loaded for connecting；
    The current transformer includes the first transistor, second transistor, third transistor, the 4th transistor, the 5th transistor, the 6th Transistor, electric capacity and equalizing resistance；The emitter stage of the first transistor, the source electrode of the second transistor connect the three-phase First phase of AC power, the emitter stage of the third transistor, the source electrode of the 4th transistor connect the three-phase alternating current Second phase of power supply, the emitter stage of the 5th transistor, the source electrode of the 6th transistor connect the three-phase alternating-current supply Third phase, the source electrode of the first transistor, the source electrode of the third transistor, the source electrode of the 5th transistor and described The first end of electric capacity connects altogether, the emitter stage of the second transistor, the emitter stage of the 4th transistor, the 6th transistor Emitter stage and the second end of the electric capacity connect altogether；
    The equalizing resistance is in parallel with the electric capacity, and the electric capacity is used to aid in stablizing middle dc voltage, quadergy storage And exchange；
    The voltage of the three-phase alternating-current supply is less than the DC voltage that the output end of the current transformer exports；
    When the air-conditioning system, which is operated in, only to be absorbed between lagging reactive power state A and unit power factor rectifier state B, Absorb active power and lagging reactive power from power network, when the air-conditioning system be operated in unit power factor rectifier state B and When only between absorption capacitive reactive power state C, active and capacitive reactive power is absorbed from power network；When the air-conditioning system works When only absorbing between capacitive reactive power state C and unity power factor inverter mode D, to electrical grid transmission is active and capacitive without Work(power；When the air-conditioning system is operated between unity power factor inverter mode D and only absorption lagging reactive power state A When, to electrical grid transmission is active and lagging reactive power.
  2. 2. air-conditioning system according to claim 1, it is characterised in that：
    Also include inductance, the inductance is connected between the power conversion unit and the current transformer.
  3. 3. air-conditioning system according to claim 1, it is characterised in that：
    The first transistor, second transistor, third transistor, the 4th transistor, the 5th transistor and the 6th transistor are equal For npn type bipolar transistor.
  4. 4. air-conditioning system according to claim 1, it is characterised in that：
    Also include controller, the grid of the first transistor, the grid of the second transistor, the grid of the third transistor Pole, the grid of the 4th transistor, the grid of the 5th transistor, the 6th transistor grid with the control Device electrically connects.
  5. 5. air-conditioning system according to claim 2, it is characterised in that：
    The inductance is integrated on the transformer of the power conversion unit.
  6. 6. according to the air-conditioning system described in claim any one of 1-4, it is characterised in that：
    The load is compressor or/and fan electromotor.
CN201410025940.6A 2014-01-20 2014-01-20 Air-conditioning system Active CN104796032B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410025940.6A CN104796032B (en) 2014-01-20 2014-01-20 Air-conditioning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410025940.6A CN104796032B (en) 2014-01-20 2014-01-20 Air-conditioning system

Publications (2)

Publication Number Publication Date
CN104796032A CN104796032A (en) 2015-07-22
CN104796032B true CN104796032B (en) 2018-03-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101488728A (en) * 2007-10-30 2009-07-22 现代电梯株式会社 Elevator driving inverter system without electrolytic capacitor
CN101969195A (en) * 2010-10-26 2011-02-09 沈阳工业大学 Transformer direct current magnetic bias compensation device with reactive power compensation function and control method
CN102139244A (en) * 2011-02-16 2011-08-03 王红星 High frequency power supply for electric dust removal
CN102897642A (en) * 2011-07-26 2013-01-30 宝山钢铁股份有限公司 Capacitor inversion type magnetizing and demagnetizing lifting electromagnet
CN203761296U (en) * 2014-01-20 2014-08-06 珠海格力电器股份有限公司 Air conditioning system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101488728A (en) * 2007-10-30 2009-07-22 现代电梯株式会社 Elevator driving inverter system without electrolytic capacitor
CN101969195A (en) * 2010-10-26 2011-02-09 沈阳工业大学 Transformer direct current magnetic bias compensation device with reactive power compensation function and control method
CN102139244A (en) * 2011-02-16 2011-08-03 王红星 High frequency power supply for electric dust removal
CN102897642A (en) * 2011-07-26 2013-01-30 宝山钢铁股份有限公司 Capacitor inversion type magnetizing and demagnetizing lifting electromagnet
CN203761296U (en) * 2014-01-20 2014-08-06 珠海格力电器股份有限公司 Air conditioning system

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