WO2016101642A1

WO2016101642A1 - Air conditioning system

Info

Publication number: WO2016101642A1
Application number: PCT/CN2015/087841
Authority: WO
Inventors: 赵志刚; 张雪芬; 任鹏; 陈颖; 蒋世用; 刘克勤
Original assignee: 珠海格力电器股份有限公司
Priority date: 2014-12-26
Filing date: 2015-08-21
Publication date: 2016-06-30
Also published as: CN104566718A

Abstract

An air conditioning system comprises: at least one fan (10), at least one compressor (20), a direct current bus, at least one fan converter (30) respectively corresponding and connected to the at least one fan (10), and at least one compressor converter (40) respectively corresponding and connected to the at least one compressor (20), both the at least one fan converter (30) and the at least one compressor converter (40) being connected to the direct current bus; at least one fan converter (30) has an inverted state for driving the fan (10) and a rectification state for recovering electrical energy generated by the fan (10). When the air conditioning system is operating, the fan converter (30) operates under the inverted state, the driving fan (10) conducts heat dissipation on the air conditioning system; when the air conditioning system stops, if the fan (10) is driven by the air to generate electricity, the fan converter (30) operates under the rectification state, thus recovering the electrical energy.

Description

Air Conditioning System

Technical field

The present application relates to the field of air conditioning, and in particular to an air conditioning system.

Background technique

Increasingly strong environmental protection and energy saving requirements make the development of both home air conditioners and commercial air conditioners gradually develop toward the direction of frequency conversion. At present, permanent magnet synchronous fans (ie, fans driven by permanent magnet synchronous motors) have been widely used in air conditioners. For the characteristics of reverse power generation of permanent magnet synchronous machines, it is often necessary to perform reverse braking control (software control or hardware mechanical control) on the air conditioner's fan. Therefore, the risk of motor burnout caused by the reverse power generation of the permanent magnet synchronous fan in the outdoor unit of the air conditioner is avoided, but the setting of the reverse brake control also causes the fault point of the air conditioner to increase; in addition, the energy generated by the reverse power generation of the fan is not effectively recovered. Utilization leads to waste of energy.

Summary of the invention

The present invention aims to provide an air conditioning system that can be more energy efficient.

The present invention provides an air conditioning system comprising at least one fan and at least one compressor, the air conditioning system further comprising a DC bus, and at least one fan converter and at least one connected in one-to-one correspondence with the at least one fan At least one compressor converter connected to the compressor one at a time, at least one fan converter and at least one compressor converter are connected to the DC bus; wherein at least one fan converter has a drive The inverter's inverter state and the rectification state of the recovered fan's power generation.

According to the air conditioning system of the present invention, by providing a fan converter corresponding to the fan, when the air conditioning system is working, the fan converter operates in an inverting state, and the fan is driven to dissipate heat to the air conditioning system. When the air conditioning system is stopped, the fan is In the case of wind driven power generation, the fan converter operates in a rectified state to recover electrical energy. That is, when the air conditioning system is not working, the fan becomes a generator, which makes the air conditioning system more energy efficient.

DRAWINGS

The accompanying drawings, which are incorporated in and in in set. In the drawing:

1 is a schematic view showing the principle of a first embodiment of an air conditioning system according to the present application;

2 is a schematic diagram showing the principle of a second embodiment of an air conditioning system according to the present application;

3 is a schematic diagram showing the principle of a third embodiment of an air conditioning system according to the present application;

4 is a schematic diagram showing the principle of a fourth embodiment of an air conditioning system according to the present application;

Figure 5 is a schematic diagram showing the principle of a fifth embodiment of the air conditioning system according to the present application;

Figure 6 is a schematic view showing the principle of a sixth embodiment of the air conditioning system according to the present application;

Description of the reference signs:

10, fan; 20, compressor; 30, fan converter; 40, compressor converter; 50, grid-connected converter; 60, power grid; 70, isolation transformer; 80, hybrid energy; unit.

detailed description

The present application will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a first embodiment of an air conditioning system according to the present application includes a fan 10 and a compressor 20. The air conditioning system further includes a DC bus, and a fan converter 30 correspondingly connected to the fan 10. And a compressor inverter 40 correspondingly connected to the compressor 20, the fan converter 30 and the compressor inverter 40 are connected to the DC bus, and the compressor inverter 40 drives the compressor to convert the air conditioner system. The frequency conversion runs. In this embodiment, the fan converter 30 has an inverter state for driving the fan 10 and a rectification state for recovering the power generated by the fan 10. That is, when the air conditioning system is in operation, the fan inverter 30 operates in an inverting state, and the fan 10 is driven to dissipate heat to the air conditioning system. When the air conditioning system is stopped, in the case where the fan 10 is driven by the wind to generate electricity, the fan inverter 30 operates. Rectified state to recover electrical energy. That is, when the air conditioning system is not working, the fan becomes a generator, which makes the air conditioning system more energy efficient.

Further, as shown in FIG. 1, in the first embodiment, the air conditioning system further includes a grid-connected inverter 50, and the first end of the grid-connected inverter 50 is connected to the grid 60, and the grid-connected inverter 50 is The two ends are connected to both the compressor inverter 40 and the fan converter 30. That is, the electric energy generated by the fan 10 can be transmitted to the power grid through the grid-connected inverter 50.

Preferably, as shown in FIG. 1, in the first embodiment, the air conditioning system further includes an isolation transformer 70, which is connected in series between the power grid 60 and the grid-connected inverter 50, and the series isolation transformer 70 can improve the air conditioning system. Safety can also prevent interference. Grid-connected inverter 50 is four The quadrant converter, the fan inverter 30 and the compressor inverter 40 may employ a four-quadrant inverter or a conventional inverter.

Preferably, in conjunction with FIG. 1, the air conditioning system of the first embodiment may further include a hybrid energy source 80 that is coupled to the DC bus. Depending on the actual situation or control capability, an inverter corresponding to the hybrid energy source 80 can be provided, ie the hybrid energy source 80 is connected to the DC bus via a corresponding converter. Hybrid energy 80 includes, but is not limited to, at least two combinations of clean energy such as photovoltaic, photothermal, wind, tidal, geothermal, and biomass energy. The use of two or more energy sources simultaneously can eliminate the single energy caused by the use environment. Limitations, thereby increasing the likelihood of energy self-sufficiency in air conditioning system applications. That is to say, two or more new energy sources are connected in the DC bus, and the energy of the air conditioning system is ensured to be self-sufficient and not available from the commercial power.

Preferably, as shown in FIG. 1, the air conditioning system of the first embodiment may further include an energy storage unit 90, and the energy storage unit 90 is connected to the DC bus through a corresponding inverter, thereby recovering energy and supplying power, and setting the storage. The energy unit 90 can classify and recover the electrical energy generated by the fan 10 to generate electricity.

It should be noted that, in the embodiment provided by the present application, the air conditioning system may include at least one fan (10) and at least one compressor (20) and a DC bus, in the air conditioning system, at least one fan (10) Each fan (10) is connected to a fan converter (30), and each compressor (20) of at least one compressor (20) is connected to a compressor converter (40), wherein, at least A fan converter (30) has an inverter state for driving the fan (10) and a rectification state for recovering the power generated by the fan (10), and the at least one fan converter (30) and at least one compressor are commutated. The devices (40) are all connected to the DC bus.

The working principle and control process of the air conditioning system of the present application will be described with reference to the first embodiment shown in FIG. 1. When the air conditioning system is in operation, the control for the hybrid energy source 80 is as follows:

1. If the energy of the hybrid energy source 80 matches the air conditioning load demand, the air conditioner can be powered only by the hybrid energy source.

2. If the energy of the hybrid energy source 80 is greater than the air conditioning load demand, it can be controlled as follows:

(1) If the system does not include the energy storage unit 90, the mixed energy 80 excess energy is connected to the grid to generate electricity;

(2) If the system includes the energy storage unit 90 and the energy storage unit 90 has insufficient charge and needs to be charged, the excess energy of the hybrid energy source 80 first charges the energy storage unit 90, and then the grid is connected to generate electricity when there is still a surplus;

(3) The system includes an energy storage unit 90, and the energy storage unit 90 can also operate according to the set control logic associated with the power grid 60.

3. If the hybrid energy 80 energy is less than the air conditioning load energy:

(1) If the system does not include the energy storage unit 90, the insufficient portion of the hybrid energy source 80 is supplemented by the commercial power;

(2) If the system includes the energy storage unit 90, and the charge of the energy storage unit 90 is rich, it is first supplemented by the energy storage unit 90; if the air conditioning demand is still not met, it is supplemented by the commercial power;

(3) If the system includes the energy storage unit 90, the energy storage unit 90 can also operate according to the set control logic associated with the power grid.

When the air conditioning system is braked or not working, the energy of the hybrid energy source 80 is all connected to the grid for power generation, and the power generated by the fan 10 is recovered according to the following conditions:

1. If the energy storage unit 90 is not included, the power generated by the fan 10 is connected to the grid through a certain boosting measure or PAWM interlaced modulation.

2. When the energy storage unit 90 is included, the fan 10 generates electric energy for classification and recovery:

(1) When the fan reversal energy is less than a certain threshold, the energy can be charged to the energy storage unit 90 through the DC/DC converter corresponding to the energy storage unit 90, and the fan 10 generates electricity to be stored. Carry out recycling;

(2) When the power generated by the fan 10 reaches the grid-connected condition, the grid-connected inverter 50 and the isolating transformer 70 (the transformer can be optionally installed according to the power quality) are connected to the grid for use by other loads in the network;

(3) When the wind turbine 10 generates electricity close to the grid connection condition, the energy is recovered and connected to the grid by a certain boosting method or PAWM interlacing modulation technology.

In addition, when the power grid runs at a peak or needs support, and the energy storage unit has more than 90 power, it can respond according to the power grid dispatching, perform peak-peak peak-shaving operation, and provide certain guarantee for grid security.

Through the above control method, the recovery problem of the small electric power generated by the air conditioner system fan 10 can be effectively solved, and the diversity of the power supply of the air conditioning system is taken into consideration, so that the air conditioning system is self-sufficient as much as possible, and the power is not taken from the commercial power; the integration of the energy storage unit 90, It can effectively improve the power generation recovery rate and direct utilization rate of the wind turbine 10, and at the same time provide a certain positive effect on the power grid.

In the second embodiment shown in FIG. 2, one for two air conditioning systems (one fan 10, two pressures) The retracting machine 20) adopts a mode similar to that of the first embodiment, correspondingly, the fan converter 30, the grid-connected inverter 50, the hybrid energy source 80, the energy storage unit 90, and the like, first adopts the hybrid energy source 80, and recovers the air-conditioning system. When not working, the wind turbine 10 generates electricity, so that the air conditioning system is as self-sufficient as possible and does not consume utility power.

In the third embodiment shown in FIG. 3, the dual-fan air-conditioning system (two fans 10 and one compressor 20) also adopts a mode similar to that of the first embodiment, correspondingly setting the fan converter 30, and switching the grid. The device 50, the hybrid energy source 80, the energy storage unit 90 and the like first adopt the hybrid energy source 80, and recover the electric energy generated by the fan 10 when the air conditioning system is not working, so that the air conditioning system is self-sufficient as much as possible, and does not consume the commercial power.

A multi-air air conditioning system of the fourth embodiment shown in FIG. 4 or the multi-fan air conditioning system of the fifth embodiment shown in FIG. 5, and the sixth embodiment shown in FIG. A method similar to that of the first embodiment can be adopted in the air conditioning system of the fan, so that the air conditioning system is self-sufficient as much as possible without consuming mains.

From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

According to the air conditioning system of the present application, by setting a fan converter corresponding to the fan, when the air conditioning system is working, the fan converter operates in an inverting state, and the fan is driven to dissipate heat to the air conditioning system. When the air conditioning system is stopped, the fan is In the case of wind driven power generation, the fan converter operates in a rectified state to recover electrical energy. That is, when the air conditioning system is not working, the fan becomes a generator, which makes the air conditioning system more energy efficient.

The above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and various changes and modifications may be made to the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application are intended to be included within the scope of the present application.

Claims

An air conditioning system comprising at least one fan (10) and at least one compressor (20), wherein the air conditioning system further comprises a DC bus and a one-to-one correspondence with the at least one fan (10) Connected at least one fan converter (30) and at least one compressor converter (40) connected in one-to-one correspondence with the at least one compressor (20), the at least one fan converter (30) and the at least one compressor inverter (40) are both connected to the DC bus;

The at least one fan converter (30) has an inverter state for driving the fan (10) and a rectification state for recovering power generated by the fan (10).
The air conditioning system according to claim 1, characterized in that, in the case where the air conditioning system is in an operating state, the at least one fan converter (30) is in an inactive state.
The air conditioning system according to claim 1, characterized in that, in the case where the at least one fan (10) is in an inoperative state and the at least one fan (10) is driven to generate electricity, the at least one The fan converter (30) is in a rectified state.
The air conditioning system according to claim 1, wherein

The air conditioning system further includes a hybrid energy source (80) coupled to the DC bus; wherein the hybrid energy source (80) includes photovoltaic, photothermal, wind, tidal, geothermal, and biomass energy At least two combinations.
The air conditioning system according to claim 4, wherein

The hybrid energy source (80) is connected to the DC bus via a respective inverter.
The air conditioning system according to claim 5, wherein said hybrid energy source (80) passes said direct current in a case where said hybrid energy source (80) has the same energy as said air conditioning system load The busbar supplies power to the air conditioning system.
The air conditioning system according to claim 6, wherein said hybrid energy source (80) passes through said DC bus to said energy source of said hybrid energy source (80) greater than a load required by said air conditioning system The grid (60) is powered.
The air conditioning system according to claim 7, wherein

The air conditioning system also includes an energy storage unit (90) that is coupled to the DC bus via a respective inverter.
The air conditioning system according to claim 8, wherein

The air conditioning system further includes a grid-connected inverter (50), the first end of the grid-connected inverter (50) is connected to the grid (60), and the second end of the grid-connected inverter (50) Connected to the DC bus.
The air conditioning system according to claim 9, wherein

The air conditioning system also includes an isolation transformer (70) connected in series between the electrical grid (60) and the grid-connected inverter (50).
The air conditioning system according to claim 9 or 10, characterized in that

The grid-connected inverter (50) is a four-quadrant inverter.
The air conditioning system according to claim 1, wherein

The at least one fan converter (30) is a four-quadrant inverter.
The air conditioning system according to claim 1, wherein

The at least one compressor inverter (40) is a four-quadrant inverter.
The air conditioning system according to claim 1, wherein

The air conditioning system includes a compressor (20) and a plurality of fans (10).
The air conditioning system according to claim 1, wherein

The air conditioning system includes a plurality of compressors (20) and a fan (10).
The air conditioning system according to claim 1, wherein

The air conditioning system includes a plurality of compressors (20) and a plurality of fans (10).
An air conditioning system comprising at least one fan (10) and at least one compressor (20), characterized in that in the air conditioning system, each of the at least one fan (10) (10) Connecting a fan converter (30), each compressor (20) of the at least one compressor (20) is connected to a compressor converter (40), wherein the at least one The fan converter (30) has an inverter state for driving the fan (10) and a rectification state for recovering power generated by the fan (10), the at least one fan converter (30) and the at least one The compressor converters (40) are all connected to the DC bus.