CN104006479A - Photovoltaic air conditioning system and control method thereof - Google Patents

Photovoltaic air conditioning system and control method thereof Download PDF

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Publication number
CN104006479A
CN104006479A CN201410270459.3A CN201410270459A CN104006479A CN 104006479 A CN104006479 A CN 104006479A CN 201410270459 A CN201410270459 A CN 201410270459A CN 104006479 A CN104006479 A CN 104006479A
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China
Prior art keywords
switching tube
circuit
output
solar battery
air
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CN201410270459.3A
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Chinese (zh)
Inventor
方小斌
胡雅洁
杨帆
武建飞
孙丰涛
廖云涛
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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 CN201410270459.3A priority Critical patent/CN104006479A/en
Publication of CN104006479A publication Critical patent/CN104006479A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The invention discloses a photovoltaic air conditioning system which comprises a plurality of solar cell arrays, a photovoltaic current transformer and an air conditioning unit. The photovoltaic current transformer comprises a plurality of boosted circuits, a rectification inversion grid-connection circuit and a control circuit. The boosted circuits correspond to the solar cell arrays one to one, the output ends of the solar cell arrays are connected with the input ends of the corresponding boosted circuits, the output ends of the boosted circuits are connected with the first side of the rectification inversion grid-connection circuit, the second side of the rectification inversion grid-connection circuit is connected with a single-phase alternating-current power grid, and the control circuit is connected with the boosted circuits, the rectification inversion grid-connection circuit and the air conditioning unit respectively. The electricity supply end of the air conditioning unit is connected with the first side of the rectification inversion grid-connection circuit. The photovoltaic air conditioning system can increase the electric energy utilization rate, lower operation and maintenance cost and supply electricity to air conditioning units at a high-power level, and is wide in application range. The invention further discloses a control method of the photovoltaic air conditioning system.

Description

Photovoltaic air-conditioning system and control method thereof
Technical field
The invention belongs to air-conditioning technical field, relate in particular to photovoltaic air-conditioning system and control method thereof.
Background technology
Air-conditioning can consume a large amount of electric energy in running, in order to reduce the dependence to non-renewable energy resources, has occurred at present the air-conditioning system that can be powered by solar battery array, and its structure as shown in Figure 1.Comprise: solar battery array, DC/DC (DC-DC) converter, AC/DC (ac/dc) converter, air-conditioning unit and battery.
Wherein, solar battery array utilizes solar energy generating electric energy, by DC/DC converter, the electric energy of solar battery array output is carried out to voltage transitions afterwards, to be the power supply of air-conditioning unit, AC/DC converter is converted to direct current the alternating current in single-phase electrical network, is the power supply of air-conditioning unit.In the time that the power output of solar battery array can not meet the operation demand of air-conditioning unit, the scarce electric energy of air-conditioning unit operation is converted through single-phase electrical network by AC/DC converter, or carries out auxiliary power supply by battery.In the time that the power output of solar battery array is greater than the operate power of air-conditioning unit, the unnecessary power storage of solar battery array output is in battery.
In above-mentioned air-conditioning system, the electric energy that solar battery array produces can only offer air-conditioning unit or be stored in battery, and the memory capacity of battery is limited, in the time that solar battery array produces a large amount of electric energy under sun-drenched condition, unnecessary electric energy may cannot be stored and slatterns due to battery.In addition, the service life of battery is shorter and cost is higher, and this causes the operation expense of air-conditioning system very high.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of photovoltaic air-conditioning system, the unnecessary electric energy feedback electrical network that solar battery array can be produced to improve energy utilization rate, reduces operation expense simultaneously.
For achieving the above object, the invention provides following technical scheme:
The invention discloses a kind of photovoltaic air-conditioning system, comprise multiple solar battery arrays, photovoltaic current transformer and air-conditioning unit;
Described photovoltaic current transformer comprises booster circuit, commutation inversion parallel network circuit and control circuit, described booster circuit is multiple, multiple booster circuits are corresponding one by one with described multiple solar battery arrays, the output of described solar battery array connects with the input of corresponding booster circuit, the output of described multiple booster circuits is connected with the first side of described commutation inversion parallel network circuit, the second side of described commutation inversion parallel network circuit is connected with single phase ac electrical network, described control circuit respectively with described multiple booster circuits, described commutation inversion parallel network circuit is connected with described air-conditioning unit,
The feeder ear of described air-conditioning unit is connected with the first side of described commutation inversion parallel network circuit;
Described control circuit utilizes the output current of described solar battery array and output voltage to transmit control signal to corresponding booster circuit, to make described solar battery array Maximum Power Output, described control circuit is adjusted the duty of described commutation inversion parallel network circuit according to the operate power of the gross output of described multiple solar battery arrays and described air-conditioning unit.
Preferably, in above-mentioned photovoltaic air-conditioning system, described booster circuit comprises the first inductance, the first electric capacity, the first switching tube, the first diode and the second diode, the first end of described the first inductance is connected to the output of described solar battery array, the second end of described the first inductance is connected to the anode of described the first diode, the negative electrode of described the first diode is connected to the first end of described the first electric capacity, the second end ground connection of described the first electric capacity, the first end of described the first switching tube is connected to the second end of described the first inductance, the second end ground connection of described the first switching tube, the control end of described the first switching tube is connected with described control circuit, the negative electrode of described the second diode is connected to the first end of described the first switching tube, the plus earth of described the second diode, the first end of described the first electric capacity is the output of described booster circuit.
Preferably, in above-mentioned photovoltaic air-conditioning system, described booster circuit also comprises the second inductance, second switch pipe, the 3rd diode and the 4th diode; The first end of described the second inductance is connected to the first end of described the first inductance, the second end of described the second inductance is connected to the anode of described the 3rd diode, the negative electrode of described the 3rd diode is connected to the first end of described the first electric capacity, the first end of described second switch pipe is connected to the second end of described the second inductance, the second end ground connection of described second switch pipe, the control end of described second switch pipe is connected with described control circuit, the negative electrode of described the 4th diode is connected to the first end of described second switch pipe, the plus earth of described the 4th diode.
Preferably, in above-mentioned photovoltaic air-conditioning system, described commutation inversion parallel network circuit comprises the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 3rd inductance, the 4th inductance and four diodes; Described the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube be diode of reverse parallel connection respectively; Described the 3rd first end of switching tube and the output of described multiple booster circuits are connected, the second end of described the 3rd switching tube is connected to the first end of described the 4th switching tube, the second end ground connection of described the 4th switching tube, the first end of described the 5th switching tube is connected with the first end of described the 3rd switching tube, the second end of described the 5th switching tube is connected to the first end of described the 6th switching tube, the second end ground connection of described the 6th switching tube, the control end of described the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube is connected with described control circuit respectively; The second end, the other end that one end of described the 3rd inductance is connected to described the 3rd switching tube is connected to the live wire of described single phase ac electrical network, and the second end, the other end that one end of described the 4th inductance is connected to described the 5th switching tube is connected to the zero line of described single phase ac electrical network.
Preferably, in above-mentioned photovoltaic air-conditioning system, described commutation inversion parallel network circuit also comprises the first resistance, the second resistance, the second electric capacity and the 3rd electric capacity; One end of described the first resistance is connected to the first end of described the 3rd switching tube, the other end of described the first resistance is by described the second resistance eutral grounding, one end of described the second electric capacity is connected to the first end of described the 3rd switching tube, the other end of described the second electric capacity is by described the 3rd capacity earth, the common port short circuit of the common port of described the first resistance and the second resistance and described the second electric capacity and the 3rd electric capacity.
Preferably, above-mentioned photovoltaic air-conditioning system also comprises Switching Power Supply; The input of described Switching Power Supply is connected with the first side of described commutation inversion parallel network circuit, and described Switching Power Supply is carried out voltage transitions to the direct current in described photovoltaic current transformer.
Preferably, above-mentioned photovoltaic air-conditioning system also comprises direct current user interface, and the input of described direct current user interface is connected with the first side of the output of described Switching Power Supply or described commutation inversion parallel network circuit.
The control method that the invention also discloses a kind of photovoltaic air-conditioning system, comprising:
Obtain respectively output current and the output voltage of multiple solar battery arrays;
Utilize respectively output current and the output voltage of described multiple solar battery arrays to generate control signal, the multiple booster circuits in photovoltaic current transformer send respectively corresponding control signal, to make described multiple solar battery array Maximum Power Output;
Determine the operate power of gross output and the air-conditioning unit of described multiple solar battery arrays;
Utilize described gross output and described operate power to adjust the duty of described commutation inversion parallel network circuit, so that in the situation that described gross output is less than described operate power, be air-conditioning unit auxiliary power supply by single phase ac electrical network, in the situation that described gross output is greater than described operate power, to described single phase ac electrical network feedback electric energy.
Preferably, in above-mentioned control method, the described duty of utilizing described gross output and described operate power to adjust described commutation inversion parallel network circuit, comprising:
Calculate the difference of the gross output of described multiple solar battery arrays and the operate power of air-conditioning unit;
In the situation that described difference is 0, control described commutation inversion parallel network circuit in holding state;
In the situation that described difference is greater than 0, controls described commutation inversion parallel network circuit and run on inversion grid connection state;
In the situation that described difference is less than 0, controls described commutation inversion parallel network circuit and run on rectification state.
As can be seen here, beneficial effect of the present invention is: the above-mentioned disclosed photovoltaic air-conditioning system of the present invention, comprise multiple solar battery arrays, photovoltaic current transformer and air-conditioning unit, the electric energy that multiple solar battery arrays produce can be the power supply of air-conditioning unit, the electric energy producing at multiple solar battery arrays has in remaining situation, control commutation inversion parallel network circuit and run on inversion grid connection state, so that by unnecessary electric energy feedback to single phase ac electrical network, thereby raising utilization rate of electrical, because photovoltaic air-conditioning system disclosed by the invention does not arrange battery, therefore can avoid producing the expense of changing battery, thereby reduce the operation expense of system.
In addition, existing air-conditioning system only arranges a solar module, and in order to ensure that the size of this solar module is very large for air-conditioning unit normal power supply, this use occasion to air-conditioning system causes very large restriction.And photovoltaic air-conditioning system disclosed by the invention comprises multiple solar battery arrays, because multiple solar battery arrays can be installed respectively, therefore in some spaces, less occasion also can be used photovoltaic air-conditioning system disclosed by the invention, makes the scope of application of photovoltaic air-conditioning system disclosed by the invention wider.And photovoltaic air-conditioning system disclosed by the invention, can carry out maximum power point tracking to each solar battery array, makes each solar battery array Maximum Power Output, to be the air-conditioning unit power supply of high-power grade.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of existing air-conditioning system;
Fig. 2 is the structural representation of a kind of photovoltaic air-conditioning system disclosed by the invention;
Fig. 3 is the circuit diagram of a kind of booster circuit disclosed by the invention;
Fig. 4 is the circuit diagram of another kind of booster circuit disclosed by the invention;
Fig. 5 is the circuit diagram of a kind of commutation inversion parallel network circuit disclosed by the invention;
Fig. 6 is the circuit diagram of another kind of commutation inversion parallel network circuit disclosed by the invention;
Fig. 7 is the control block diagram of commutation inversion parallel network circuit in the time of rectification duty;
Fig. 8 is the control block diagram of commutation inversion parallel network circuit in the time of inversion grid connection duty;
Fig. 9 is the structural representation of another kind of photovoltaic air-conditioning system disclosed by the invention;
Figure 10 is the flow chart of the control method of a kind of photovoltaic air-conditioning system disclosed by the invention.
Detailed description of the invention
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The present invention discloses a kind of photovoltaic air-conditioning system, and the unnecessary electric energy feedback electrical network that solar battery array can be produced to improve utilization rate of electrical, reduces operation expense simultaneously.
Referring to Fig. 2, Fig. 2 is the structural representation of a kind of photovoltaic air-conditioning system disclosed by the invention.This photovoltaic air-conditioning system comprises solar battery array 11-13, photovoltaic current transformer 20 and air-conditioning unit 30.
Wherein:
Solar battery array 11-13 utilizes solar energy to produce electric energy output.Each solar battery array can be made up of the solar-energy photo-voltaic cell unit of any amount, that is to say that the apparent size of each solar battery array can be identical, also can be different.And, the mounting means variation of solar battery array, for example balcony is installed, roof is installed, or metope is installed.
Photovoltaic current transformer 20 comprises booster circuit 211-213, commutation inversion parallel network circuit 22 and control circuit (not shown).Solar battery array 11-13 is corresponding one by one with booster circuit 211-213, the output of solar battery array 11-13 connects with the input of corresponding booster circuit, concrete: the output of solar battery array 11 is connected with the input of booster circuit 211, the output of solar battery array 12 is connected with the input of booster circuit 212, and the output of solar battery array 13 is connected with the input of booster circuit 213.The output of booster circuit 211-213 is connected with the first side of commutation inversion parallel network circuit 22, and the second side of commutation inversion parallel network circuit 22 is connected with single phase ac electrical network AC.Control circuit is connected with booster circuit 211-213, commutation inversion parallel network circuit 22 and air-conditioning unit 30 respectively.
The feeder ear of air-conditioning unit 30 is connected with the first side of commutation inversion parallel network circuit 22.
Control circuit utilizes the output current of solar battery array 11-13 and output voltage to transmit control signal to corresponding booster circuit, to make each solar battery array Maximum Power Output.Control circuit is adjusted the duty of commutation inversion parallel network circuit according to the operate power of the gross output of solar battery array 11-13 and air-conditioning unit 30.
The above-mentioned disclosed photovoltaic air-conditioning system of the present invention, comprise multiple solar battery arrays, photovoltaic current transformer and air-conditioning unit, the electric energy that multiple solar battery arrays produce can be the power supply of air-conditioning unit, the electric energy producing at multiple solar battery arrays has in remaining situation, control commutation inversion parallel network circuit and run on inversion grid connection state, so that by unnecessary electric energy feedback to single phase ac electrical network, thereby raising utilization rate of electrical, because photovoltaic air-conditioning system disclosed by the invention does not arrange battery, therefore can avoid producing the expense of changing battery, thereby reduce the operation expense of system.
In addition, existing air-conditioning system only arranges a solar module, and in order to ensure that the size of this solar module is very large for air-conditioning unit normal power supply, this use occasion to air-conditioning system causes very large restriction.And photovoltaic air-conditioning system disclosed by the invention comprises multiple solar battery arrays, because multiple solar battery arrays can be installed respectively, therefore in some spaces, less occasion also can be used photovoltaic air-conditioning system disclosed by the invention, makes the scope of application of photovoltaic air-conditioning system disclosed by the invention wider.And photovoltaic air-conditioning system disclosed by the invention, can carry out maximum power point tracking (MPPT) to each solar battery array, makes each solar battery array Maximum Power Output, to be the air-conditioning unit power supply of high-power grade.
Although 3 solar battery arrays and 3 booster circuits have been shown in Fig. 2, should be understood that, the present invention is not limited thereto, according to concrete application scenario, this photovoltaic air-conditioning system can arrange the solar battery array of arbitrary number, and corresponding photovoltaic current transformer 20 arranges the booster circuit of equivalent amount.
In the photovoltaic air-conditioning system shown in Fig. 2, booster circuit can adopt various structures.Below in conjunction with Fig. 3 and Fig. 4, two kinds of structures are wherein described.
Referring to Fig. 3, the circuit diagram that Fig. 3 is a kind of booster circuit disclosed by the invention.This booster circuit comprises the first inductance L 1, the first capacitor C 1, the first switching tube M1, the first diode D1 and the second diode D2.
The first end of the first inductance L 1 is connected to the output of solar battery array, and the second end of the first inductance L 1 is connected to the anode of the first diode D1, and the negative electrode of the first diode D1 is connected to the first end of the first capacitor C 1, the second end ground connection of the first capacitor C 1.The first end of the first switching tube M1 is connected to the second end of the first inductance L 1, the second end ground connection of the first switching tube M1, and the control end of the first switching tube M1 is connected with control circuit.The negative electrode of the second diode D2 is connected to the first end of the first switching tube M1, the plus earth of the second diode D2.The first end of the first capacitor C 1 is the output of this booster circuit.
In the time of the first switching tube M1 conducting, the electric current of first inductance L 1 of flowing through increases, because inductance has the characteristic that electric current can not suddenly change, at the first switching tube M1 blocking interval, the voltage producing in the first inductance L 1 adds the output voltage of solar battery array, through the first diode D1, the first capacitor C 1 is charged, thereby the electric energy of solar battery array output is forwarded in the first capacitor C 1.
Control circuit utilizes the output current of solar battery array and output voltage to generate control signal, this control signal transfers to the control end of the first switching tube M1 in the booster circuit being connected with this solar battery array, to adjust the output voltage of this solar battery array, realize the maximum power tracing to this solar battery array.
Fig. 4 shows another kind of booster circuit.This booster circuit comprises the first inductance L 1, the first capacitor C 1, the first switching tube M1, the first diode D1, the second diode D2, the second inductance L 2, second switch pipe M2, the 3rd diode D3 and the 4th diode D4.
The first end of the first inductance L 1 is connected to the output of solar battery array, and the second end of the first inductance L 1 is connected to the anode of the first diode D1, and the negative electrode of the first diode D1 is connected to the first end of the first capacitor C 1, the second end ground connection of the first capacitor C 1.The first end of the second inductance L 2 is connected to the first end of the first inductance L 1, and the second end of the second inductance L 2 is connected to the anode of the 3rd diode D3, and the negative electrode of the 3rd diode D3 is connected to the first end of the first capacitor C 1.The first end of the first switching tube M1 is connected to the second end of the first inductance L 1, the second end ground connection of the first switching tube M1, and the control end of the first switching tube M1 is connected with control circuit.The negative electrode of the second diode D2 is connected to the first end of the first switching tube M1, the plus earth of the second diode D2.The first end of second switch pipe M2 is connected to the second end of the second inductance L 2, the second end ground connection of second switch pipe M2, and the control end of second switch pipe M2 is connected with control circuit.The negative electrode of the 4th diode D4 is connected to the first end of second switch pipe M2, the plus earth of the 4th diode.The first end of the first capacitor C 1 is the output of this booster circuit.
Booster circuit shown in Fig. 4 is two-way interleaved boost circuit, and its operation principle is identical with the single channel booster circuit shown in Fig. 3, and the control signal of the first switching tube M1 and second switch pipe M2 is produced by control circuit, and two paths of signals differs 180 °.Control because booster circuit shown in Fig. 4 is that two-way is staggered, the Primary Component of circuit as the rated capacity of inductance, diode and switching tube be only the half of booster circuit as shown in Fig. 3.
Maximum power point tracking technology has been very ripe technology, and existing multiple MPPT algorithm, also has multiple MPPT chip at present, and in the present invention, control circuit can be the processor that is built-in with MPPT algorithm, also can adopt existing MPPT chip to form.
Commutation inversion parallel network circuit in the present invention can enter rectification duty or inversion grid connection duty under the control of control circuit.Fig. 5 shows a kind of structure of commutation inversion parallel network circuit, comprises the 3rd switching tube M3, the 4th switching tube M4, the 5th switching tube M5, the 6th switching tube M6, the 3rd inductance L 3, the 4th inductance L 4 and four diode D5-D8.
Wherein, the 3rd switching tube M3, the 4th switching tube M4, the 5th switching tube M5 and the 6th switching tube M6 switching tube of reverse parallel connection respectively.Concrete, the negative electrode of the 5th diode D5 is connected to the first end of the 3rd switching tube M3, the second end of anodic bonding to the three switching tube M3, the negative electrode of the 6th diode D6 is connected to the first end of the 4th switching tube M4, the second end of anodic bonding to the four switching tube M4, the negative electrode of the 7th diode D7 is connected to the first end of the 5th switching tube M5, the second end of anodic bonding to the five switching tube M5, and the negative electrode of the 8th diode D8 is connected to the first end of the 6th switching tube M6, the second end of anodic bonding to the six switching tube M6.
The 3rd first end of switching tube M3 and the output of multiple booster circuits are connected, the second end of the 3rd switching tube M3 is connected to the first end of the 4th switching tube M4, the second end ground connection of the 4th switching tube M4, the first end of the 5th switching tube M5 is connected with the first end of the 3rd switching tube M3, the second end of the 5th switching tube M5 is connected to the first end of the 6th switching tube M6, the second end ground connection of the 6th switching tube M6, in addition, the control end of the 3rd switching tube M3, the 4th switching tube M4, the 5th switching tube M5 and the 6th switching tube M6 is connected with control circuit respectively.
The second end, the other end that one end of the 3rd inductance L 3 is connected to the 3rd switching tube M3 is connected to the live wire L of single phase ac electrical network, and the second end, the other end that one end of the 4th inductance L 4 is connected to the 5th switching tube M5 is connected to the zero line N of single phase ac electrical network.
In enforcement, can also improve the parallel network circuit of commutation inversion shown in Fig. 5, further increase the first resistance R 1, the second resistance R 2 as equalizing resistance, the second capacitor C 2 and the 3rd capacitor C 3 as storage capacitor, as shown in Figure 6.Concrete: one end of the first resistance R 1 is connected to the first end of the 3rd switching tube M3, the other end of the first resistance R 1 is by the second resistance R 2 ground connection, one end of the second capacitor C 2 is connected to the first end of the 3rd switching tube M3, the other end of the second capacitor C 2 is by the 3rd capacitor C 3 ground connection, the common port short circuit of the common port of the first resistance R 1 and the second resistance R 2 and the second capacitor C 2 and the 3rd capacitor C 3.
In the commutation inversion parallel network circuit shown in Fig. 5 and Fig. 6, the first end of the 3rd switching tube M3 is as the first side of commutation inversion parallel network circuit, be connected with output and the air-conditioning unit of each booster circuit, and second end (namely the 3rd inductance L 3 connects one end of live wire) of the 3rd inductance L 3 and second end (namely the 4th inductance L 4 is connected one end of zero line) of the 4th inductance L 4 are as the second side of commutation inversion parallel network circuit, be connected with single phase ac electrical network.
In the time that commutation inversion parallel network circuit works in rectification state, the electric energy of single phase ac electrical network flows into commutation inversion parallel network circuit, is undertaken forming direct current after rectification by commutation inversion parallel network circuit, is the power supply of air-conditioning unit.Its operation principle is: in the time of the 4th switching tube M4 conducting, current path is live wire L-the 3rd inductance L 3-the 4th switching tube M4-the 8th diode D8-the 4th inductance L 4-zero line N, in the 4th switching tube M4 conduction period, the electric current of the 3rd inductance L 3 of flowing through increases, store electrical energy; In the time that the 4th switching tube M4 turn-offs, the electric energy being stored in the 3rd inductance L 3 flows out through the 5th diode D5, is the power supply of air-conditioning unit.In the time that commutation inversion parallel network circuit works in rectification state, control circuit control the 3rd switching tube M3 and the 5th switching tube M5 continue in off state.
In enforcement, in the situation that commutation inversion parallel network circuit works in rectification state, must regulate in real time phase current I rwaveform phase follow phase voltage V rwaveform phase, thereby improve power factor, reduce harmonic components and content, control procedure as shown in Figure 7.Wherein, outer shroud is Voltage loop, and the voltage of major control commutation inversion parallel network circuit the first side is fixed value V dC-REF; Interior ring is electric current loop, its reference value I r-REFcontrolled value and power reference and the actual phase voltage V of output through PID by outer voltage rafter multiplier, obtain, the difference of current reference value and actual current detected value is carried out PID control, its Output rusults and actual phase voltage V rafter addition, after conversion, obtain the reference value V of phase voltage pWM-R, then carry out SPWM modulation (being sinusoidal pulse width modulation), by V pWM-Rmake comparisons with default triangular carrier, produce PWM (pulse width modulation) signal of gauge tap pipe.
Concrete:
Obtain the voltage reference value V of the first side of commutation inversion parallel network circuit dC-REFwith real-time voltage value V dC; Calculating voltage reference value V dC_REFwith real-time voltage value V dCbetween difference, to this difference carry out PID (PID) control, obtain value and power reference P m; By value and power reference P mactual phase voltage value V with commutation inversion parallel network circuit the second side robtain current reference value I through multiplier processing r-REF; Calculate current reference value I r-REFwith actual current value I rdifference, this difference is carried out to PID control, obtain the voltage signal of vector; By the voltage signal of vector and actual phase voltage value V rsue for peace, obtain the reference value of phase voltage; The reference value of phase voltage is carried out to transformation of scale, obtain the voltage reference value V of commutation inversion parallel network circuit the second side pWM-R; To voltage reference value V pWM-Rcarry out SPWM modulation, by V pWM-Rmake comparisons with default triangular carrier, produce the pwm signal of gauge tap pipe.
In the time that commutation inversion parallel network circuit works in inversion grid connection state, the electric energy that multiple solar battery arrays produce can flow into single phase ac electrical network via photovoltaic current transformer.Concrete: because photovoltaic current transformer is connected with single phase ac electrical network, the output voltage of photovoltaic current transformer is determined by the voltage of single phase ac electrical network, can reach to the object of single phase ac electrical network input power by the electric current of control inputs single phase ac electrical network.Meanwhile, the current harmonic content of input single-phase AC network must meet GB requirement, therefore must monitor the phase place of line voltage simultaneously, to guarantee that the electric current of inputting electrical network reaches with line voltage with the requirement of homophase frequently.
In enforcement, in the situation that commutation inversion parallel network circuit works in inversion grid connection state, adopt dicyclo control, control procedure as shown in Figure 8.Wherein, outer shroud is Voltage loop, and the voltage of major control commutation inversion parallel network circuit the first side is fixed value V dC-REFand need be higher than single phase ac electrical network voltage; Interior ring is electric current loop, and its reference value is given by outer voltage and voltage phaselocked loop, by the difference of current inner loop reference value and actual detected value is carried out to PID control, obtains photovoltaic current transformer output voltage U rreference value, then adopt SPWM modulator approach, by U rreference value and triangular carrier make comparisons, produce the pwm signal of gauge tap pipe.The pwm signal that is positioned at two switching tubes of upper and lower bridge arm is complementary, i.e. conducting simultaneously.Voltage phaselocked loop is mainly for detection of the voltage-phase of single phase ac electrical network, with electric current and the same homophase frequently of line voltage of control inputs single phase ac electrical network.
Concrete:
Obtain the voltage reference value V of the first side of commutation inversion parallel network circuit dC-REFwith real-time voltage value V dC; Calculating voltage reference value V dC_REFwith real-time voltage value V dCbetween difference, this difference is carried out to PID control, obtain value and power reference P m; To the actual phase voltage value V of commutation inversion parallel network circuit the second side rcarry out transformation of scale (proportionality coefficient is K1); By value and power reference P mobtain current reference value I with the phase voltage value after transformation of scale through multiplier processing ref-R; Calculate current reference value I ref-Rwith actual current value I rdifference, this difference is carried out to PID control, obtain the voltage signal of vector; By the voltage signal of vector and actual phase voltage value V rsue for peace, obtain the reference value of phase voltage; The reference value of phase voltage is carried out to transformation of scale (proportionality coefficient is K2), obtain the voltage reference value V of commutation inversion parallel network circuit the second side pWM-R; To the voltage reference value V of output voltage pWM-Rcarry out SPWM modulation, by V pWM-Rmake comparisons with default triangular carrier, produce the pwm signal of gauge tap pipe.
The present invention also discloses a kind of photovoltaic air-conditioning system, and its structure as shown in Figure 9.Here only just describe with the difference of the air-conditioning system of photovoltaic shown in Fig. 2.
In the air-conditioning system of photovoltaic shown in Fig. 9, further be provided with Switching Power Supply 40, the input of Switching Power Supply 40 is connected with the first side of commutation inversion parallel network circuit 22, direct current in photovoltaic current transformer 20 (can be the direct current of booster circuit output, can be also the direct current that commutation inversion parallel network circuit 22 is exported) is carried out to voltage transitions.In enforcement, low-voltage direct load in air-conditioning unit 30 can be connected with the output of Switching Power Supply 40, be each low-voltage direct load supplying by Switching Power Supply 40, wherein the low-voltage direct load in air-conditioning unit 30 includes but not limited to control chip, valve class, sensor.
In addition, in the air-conditioning system of photovoltaic shown in Fig. 9, be also provided with direct current user interface 50, the input of direct current user interface 50 is connected with the output of Switching Power Supply 40 or the first side of commutation inversion parallel network circuit 22, and user can be plugged on direct current user interface 50 by other consumers (as illuminating lamp, fan, water heater etc.).In enforcement, the direct current user interface of direct current 380V, 220V, 24V and 15V can be set.
Accordingly, the present invention also discloses a kind of control method of photovoltaic air-conditioning system, as shown in figure 10, comprising:
Step S1: the output current and the output voltage that obtain respectively multiple solar battery arrays.
Step S2: utilize respectively the output current of multiple solar battery arrays and output voltage to generate control signal, the multiple booster circuits in photovoltaic current transformer send respectively corresponding control signal, to make multiple solar battery array Maximum Power Outputs.
Control circuit obtains output current and the output voltage of each solar battery array, utilize the output current of each solar battery array and output voltage to determine the control signal of corresponding booster circuit, afterwards control signal is sent to corresponding booster circuit, make each solar battery array Maximum Power Output, realize respectively maximum power tracing for each solar battery array.
Step S3: the operate power of determining gross output and the air-conditioning unit of multiple solar battery arrays.
Step S4: utilize gross output and operate power to adjust the duty of commutation inversion parallel network circuit, so that in the situation that gross output is less than operate power, be air-conditioning unit auxiliary power supply by single phase ac electrical network, in the situation that gross output is greater than operate power, to single phase ac electrical network feedback electric energy.
Here it should be noted that, Figure 10 only shows a kind of control method, in concrete application, first performs step S3 and S4, performs step S1 more afterwards and S2 is also fine.
Based on the control method shown in Figure 10 of the present invention, can carry out maximum power point tracking to each solar battery array, make each solar battery array Maximum Power Output, to be the air-conditioning unit power supply of high-power grade.In addition, in the time that the gross output of multiple solar battery arrays is less than the operate power of air-conditioning unit, adjust the duty of commutation inversion parallel network circuit, to make single-phase alternating current net as air-conditioning unit auxiliary power supply, in the time that the gross output of multiple solar battery arrays is greater than the operate power of air-conditioning unit, by unnecessary electric energy feedback to single phase ac electrical network.
In enforcement, the duty of utilizing gross output and operate power to adjust commutation inversion parallel network circuit comprises:
Calculate the difference of the gross output of multiple solar battery arrays and the operate power of air-conditioning unit;
In the situation that difference is 0, control commutation inversion parallel network circuit in holding state;
In the situation that difference is greater than 0, controls commutation inversion parallel network circuit and run on inversion grid connection state;
In the situation that difference is less than 0, controls commutation inversion parallel network circuit and run on rectification state.
In the time that the difference of the gross output of multiple solar battery arrays and the operate power of air-conditioning unit is 0, the electric energy that multiple solar battery arrays produce is all used to the power supply of air-conditioning unit, and residue, does not now control commutation inversion parallel network circuit in holding state.
In the time that the difference of the gross output of multiple solar battery arrays and the operate power of air-conditioning unit is greater than 0, show that the electric energy that multiple solar battery arrays produce has residue, there are two kinds of situations in this: the first, and multiple solar battery arrays have electric energy to produce, and air-conditioning unit is in standby mode; The second, air-conditioning unit is in operational mode, and the electric energy that multiple solar battery array produces has residue.No matter be which kind of situation, all will control commutation inversion parallel network circuit in inversion grid connection state.When commutation inversion parallel network circuit is during in inversion grid connection state, its control mode as shown in Figure 8, refers to above and describes.
In the time that the difference of the gross output of multiple solar battery arrays and the operate power of air-conditioning unit is less than 0, show that the electric energy of multiple solar battery arrays generations can not meet the need for electricity of air-conditioning unit, there are two kinds of situations in this: first, multiple solar battery arrays do not produce electric energy, provide whole electric energy for air-conditioning unit by single phase ac electrical network; The second, the electric energy that multiple solar battery arrays produce can not meet the electricity consumption needs of air-conditioning unit, carry out auxiliary power supply by single phase ac electrical network.When commutation inversion parallel network circuit is during in rectification state, its control mode as shown in Figure 7, refers to above and describes.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates referring to method part.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (9)

1. a photovoltaic air-conditioning system, is characterized in that, comprises multiple solar battery arrays, photovoltaic current transformer and air-conditioning unit;
Described photovoltaic current transformer comprises booster circuit, commutation inversion parallel network circuit and control circuit, described booster circuit is multiple, multiple booster circuits are corresponding one by one with described multiple solar battery arrays, the output of described solar battery array connects with the input of corresponding booster circuit, the output of described multiple booster circuits is connected with the first side of described commutation inversion parallel network circuit, the second side of described commutation inversion parallel network circuit is connected with single phase ac electrical network, described control circuit respectively with described multiple booster circuits, described commutation inversion parallel network circuit is connected with described air-conditioning unit,
The feeder ear of described air-conditioning unit is connected with the first side of described commutation inversion parallel network circuit;
Described control circuit utilizes the output current of described solar battery array and output voltage to transmit control signal to corresponding booster circuit, to make described solar battery array Maximum Power Output, described control circuit is adjusted the duty of described commutation inversion parallel network circuit according to the operate power of the gross output of described multiple solar battery arrays and described air-conditioning unit.
2. photovoltaic air-conditioning system according to claim 1, is characterized in that, described booster circuit comprises the first inductance, the first electric capacity, the first switching tube, the first diode and the second diode;
The first end of described the first inductance is connected to the output of described solar battery array, the second end of described the first inductance is connected to the anode of described the first diode, the negative electrode of described the first diode is connected to the first end of described the first electric capacity, the second end ground connection of described the first electric capacity, the first end of described the first switching tube is connected to the second end of described the first inductance, the second end ground connection of described the first switching tube, the control end of described the first switching tube is connected with described control circuit, the negative electrode of described the second diode is connected to the first end of described the first switching tube, the plus earth of described the second diode, the first end of described the first electric capacity is the output of described booster circuit.
3. photovoltaic air-conditioning system according to claim 2, is characterized in that, described booster circuit also comprises the second inductance, second switch pipe, the 3rd diode and the 4th diode;
The first end of described the second inductance is connected to the first end of described the first inductance, the second end of described the second inductance is connected to the anode of described the 3rd diode, the negative electrode of described the 3rd diode is connected to the first end of described the first electric capacity, the first end of described second switch pipe is connected to the second end of described the second inductance, the second end ground connection of described second switch pipe, the control end of described second switch pipe is connected with described control circuit, the negative electrode of described the 4th diode is connected to the first end of described second switch pipe, the plus earth of described the 4th diode.
4. according to the photovoltaic air-conditioning system described in claim 1,2 or 3, it is characterized in that, described commutation inversion parallel network circuit comprises the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 3rd inductance, the 4th inductance and four diodes;
Described the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube be diode of reverse parallel connection respectively;
Described the 3rd first end of switching tube and the output of described multiple booster circuits are connected, the second end of described the 3rd switching tube is connected to the first end of described the 4th switching tube, the second end ground connection of described the 4th switching tube, the first end of described the 5th switching tube is connected with the first end of described the 3rd switching tube, the second end of described the 5th switching tube is connected to the first end of described the 6th switching tube, the second end ground connection of described the 6th switching tube, the control end of described the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube is connected with described control circuit respectively;
The second end, the other end that one end of described the 3rd inductance is connected to described the 3rd switching tube is connected to the live wire of described single phase ac electrical network, and the second end, the other end that one end of described the 4th inductance is connected to described the 5th switching tube is connected to the zero line of described single phase ac electrical network.
5. photovoltaic air-conditioning system according to claim 4, is characterized in that, described commutation inversion parallel network circuit also comprises the first resistance, the second resistance, the second electric capacity and the 3rd electric capacity;
One end of described the first resistance is connected to the first end of described the 3rd switching tube, the other end of described the first resistance is by described the second resistance eutral grounding, one end of described the second electric capacity is connected to the first end of described the 3rd switching tube, the other end of described the second electric capacity is by described the 3rd capacity earth, the common port short circuit of the common port of described the first resistance and the second resistance and described the second electric capacity and the 3rd electric capacity.
6. according to the photovoltaic air-conditioning system described in claim 1,2,3 or 5, it is characterized in that, also comprise Switching Power Supply;
The input of described Switching Power Supply is connected with the first side of described commutation inversion parallel network circuit, and described Switching Power Supply is carried out voltage transitions to the direct current in described photovoltaic current transformer.
7. photovoltaic air-conditioning system according to claim 6, is characterized in that, also comprises direct current user interface, and the input of described direct current user interface is connected with the first side of the output of described Switching Power Supply or described commutation inversion parallel network circuit.
8. a control method for photovoltaic air-conditioning system, is characterized in that, comprising:
Obtain respectively output current and the output voltage of multiple solar battery arrays;
Utilize respectively output current and the output voltage of described multiple solar battery arrays to generate control signal, the multiple booster circuits in photovoltaic current transformer send respectively corresponding control signal, to make described multiple solar battery array Maximum Power Output;
Determine the operate power of gross output and the air-conditioning unit of described multiple solar battery arrays;
Utilize described gross output and described operate power to adjust the duty of described commutation inversion parallel network circuit, so that in the situation that described gross output is less than described operate power, be described air-conditioning unit auxiliary power supply by single phase ac electrical network, in the situation that described gross output is greater than described operate power, to described single phase ac electrical network feedback electric energy.
9. control method according to claim 8, is characterized in that, the described duty of utilizing described gross output and described operate power to adjust described commutation inversion parallel network circuit, comprising:
Calculate the difference of the gross output of described multiple solar battery arrays and the operate power of air-conditioning unit;
In the situation that described difference is 0, control described commutation inversion parallel network circuit in holding state;
In the situation that described difference is greater than 0, controls described commutation inversion parallel network circuit and run on inversion grid connection state;
In the situation that described difference is less than 0, controls described commutation inversion parallel network circuit and run on rectification state.
CN201410270459.3A 2014-06-17 2014-06-17 Photovoltaic air conditioning system and control method thereof Pending CN104006479A (en)

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Application publication date: 20140827