CN203645345U - Solar air conditioning system - Google Patents
Solar air conditioning system Download PDFInfo
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- CN203645345U CN203645345U CN201320861147.0U CN201320861147U CN203645345U CN 203645345 U CN203645345 U CN 203645345U CN 201320861147 U CN201320861147 U CN 201320861147U CN 203645345 U CN203645345 U CN 203645345U
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 132
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Abstract
The utility model discloses a solar air conditioning system. Wherein, this system includes: a solar cell array; the photovoltaic converter is connected between the solar cell array and a public power grid; the air conditioning unit is connected with the photovoltaic converter; the photovoltaic converter comprises: the control circuit is connected between the booster circuit and the solar cell array; the control circuit is respectively connected with the rectification inversion grid-connected circuit, the solar cell array and the air conditioning unit; the booster circuit is connected with the solar cell array; the rectification inversion grid-connected circuit is connected between the booster circuit and the public power grid; and the photovoltaic converter is communicated with the air conditioning unit through the communication link. Adopt the utility model discloses, solved among the prior art unnecessary energy of solar cell array output and can not repay the electric wire netting, use the too high problem of cost that the battery caused, realized the unnecessary energy repayment electric wire netting of solar energy power generation, expanded air conditioner power level, reduce cost's effect simultaneously.
Description
Technical field
The utility model relates to air conditioner field, in particular to a kind of solar air-conditioner system.
Background technology
Multi-online air-conditioning system as shown in Figure 1 mainly comprises the parts such as solar battery array 100 ', DC/DC converter, AC/DC converter, air-conditioning unit 300 ', storage battery 700 ' and single-phase electrical network 400 '.
DC/DC converter 301 ' is DC-to-DC converter, by the electric pressure converter of output fixed voltage after input voltage conversion.AC/DC converter 303 ' is AC-DC converter, for converting interchange input to direct current output.
In the multi-online air-conditioning system shown in Fig. 1, solar battery array converts direct current to sunlight, and direct current is after the conversion of DC/DC converter, and output dc voltage is to air-conditioning unit, meanwhile, DC/DC converter can be realized the maximum power point tracking (MPPT) to solar panel; AC/DC converter converts direct current to the alternating current of single-phase electrical network and powers to air-conditioning unit.
Particularly, in the time that the power output of solar battery array can not meet the operate power of air-conditioning unit, the scarce energy of air-conditioning unit operation is converted through unidirectional electrical network by AC/DC converter.
Air-conditioning unit multiple-connected battery in this system, in the time that the power output of solar battery array is greater than the operate power of air-conditioning unit, the excess energy of solar battery array output is stored in storage battery, in the time that the power output of solar battery array is not enough, powers to air-conditioning unit.
In such scheme, can only realize accurate grid-connected: in the time of the power output deficiency of solar battery array, can be from electrical network power taking; And in the time that the power output of solar battery array is sufficient, excess energy can not feedback grid, but be stored in storage battery, and storage battery cost is high, takes up space large, conversion efficiency is low; And said system can only be used for the domestic air conditioning of 1～1.5HP, use single phase poaer supply, power grade is little, Meteorological is installed high, and city installing space is limited, and marketing is limited.
In prior art, also has another solar energy multi-online air-conditioning system, as shown in Figure 2, this system mainly comprises solar battery array, air conditioning frequency converter and the first DC bus, and wherein air conditioning frequency converter comprises the grid-connected module of commutation inversion, inverted power module and the second DC bus.In this system, the direct current that solar battery array produces enters into air conditioning frequency converter by the first DC bus; The grid-connected module of commutation inversion is connected by the second DC bus with inverted power module, and the first DC bus is connected with the second DC bus.Particularly, the grid-connected module of commutation inversion can be carried out the switching of rectification and inversion grid connection according to the power output of solar battery array and the required power of air-conditioning unit, meanwhile, the grid-connected module of commutation inversion realizes the maximum power point tracking (MPPT) to solar battery array.
In air-conditioning system as shown in Figure 2, in air conditioning frequency converter, the low-voltage direct working power of the grid-connected module 230 ' of commutation inversion and inverted power module 210 ' is provided by AC/DC module, and the input power of AC/DC module is provided by utility network 400 '; System load (as equal fuel tap, the oil return valve etc.) power supply of air-conditioning unit 300 ' is provided by utility network single phase poaer supply (220VAC).
In the frequency-conversion air-conditioning system shown in Fig. 2, because the electric current of solar battery array 100 ' output is linked into the grid-connected module of commutation inversion by the first DC bus 260 ', the maximum power point tracking (MPPT) of solar battery array is realized by the grid-connected module of commutation inversion, therefore solar battery array output voltage is determined by the grid-connected module of commutation inversion, in this process, to realize unnecessary energy energy feedback grid, must guarantee the voltage ratio public power net height of the second DC bus 310 ', thereby determine that solar battery array output voltage is also than utility network (specified 540VDC) height, therefore the voltage range that its MPPT realizes also must be higher than utility grid voltage.Therefore, cannot realize the maximum power point tracking (MPPT) of solar battery array in the most of the time in the middle of one day, MPPT inefficiency, does not reach the object of optimal utilization solar battery array power output; , solar battery array requirement is also increased meanwhile, increased input cost; And the system load of air-conditioning unit (as equal fuel tap, oil return valve etc.) power supply is alternating current, and the air conditioning frequency converter 330 ' of unit has again direct current (the second DC bus), and between dissimilar power supply, interlaced meeting brings electromagnetic interference problem.
As from the foregoing, the scheme of multi-online air-conditioning system of the prior art mainly contains following defect:
(1) in existing scheme one, the excess energy of solar battery array output can not feedback grid, need to increase the high cost that storage battery causes; And the air-conditioning power grade that scheme of the prior art can supply is little, use occasion is limited, the high popularization difficulty of bringing of input cost.
(2) maximum power point tracking (MPPT) efficiency in existing scheme is low, cannot optimal utilization solar power generation.
(3) between dissimilar in existing scheme (direct current and interchange) power supply, interlaced meeting brings electromagnetic interference; In existing scheme, system load power supply is the safety issue that High Level AC Voltage brings.
For the excess energy of available technology adopting solar battery array output can not feedback grid, the high cost that uses storage battery to cause, and air-conditioning power grade is little, use occasion is limited, the problem of the high popularization difficulty of bringing of input cost, not yet proposes at present effective solution.
Utility model content
For the excess energy that adopts solar battery array output in correlation technique can not feedback grid, the high cost that uses storage battery to cause, and air-conditioning power grade is little, use occasion is limited, the problem of the high popularization difficulty of bringing of input cost, effective solution is not yet proposed at present, for this reason, main purpose of the present utility model is to provide a kind of solar air-conditioner system, to address the above problem.
To achieve these goals, according to an aspect of the present utility model, provide a kind of solar air-conditioner system, this system comprises: sun energy array; Photovoltaic current transformer, photovoltaic current transformer is connected between solar battery array and utility network; Air-conditioning unit, is connected with photovoltaic current transformer; Wherein, photovoltaic current transformer comprises: booster circuit, commutation inversion parallel network circuit and control circuit, and control circuit is connected between booster circuit and solar battery array; Control circuit is connected with commutation inversion parallel network circuit, solar battery array and air-conditioning unit respectively; Booster circuit is connected with solar battery array; Commutation inversion parallel network circuit is connected between booster circuit and utility network; And communication link, photovoltaic current transformer and air-conditioning unit carry out communication by communication link.
Further, solar air-conditioner system also comprises: the circuit that confluxes, and the circuit that confluxes is connected between solar battery array and booster circuit; The first DC bus, booster circuit is connected with commutation inversion parallel network circuit by the first DC bus; The second DC bus, the first end of the second DC bus is connected with the first DC bus, and the second end of the second DC bus is connected with air-conditioning unit.
Further, air-conditioning unit comprises: compressor inverter circuit, and compressor inverter circuit receives the energy supply direct current of photovoltaic current transformer by the second DC bus, and compressor inverter circuit is connected with compressor; Blower fan inverter circuit, blower fan inverter circuit receives the energy supply direct current of photovoltaic current transformer by the second DC bus, and blower fan inverter circuit is connected with blower fan; Compressor inverter circuit comprises first control circuit, and blower fan inverter circuit comprises second control circuit; Switching Power Supply, is connected with first control circuit, second control circuit, air-conditioning governor circuit and air-conditioning unit DC load respectively.
Further, booster circuit comprises: the first energy storage inductor, and the first end of the first energy storage inductor is connected with the output of solar battery array; The first diode, the first end of the first diode is connected with the second end of the first energy storage inductor; The first power switch pipe, the first end of the first power switch pipe is connected with the second end of the first energy storage inductor, the second end ground connection of the first power switch pipe, the control end of the first power switch pipe is connected with control circuit; The first storage capacitor, the first end of the first storage capacitor is connected with the second end of the first diode, the second end ground connection of the first storage capacitor; And the second end of the first diode is connected with commutation inversion parallel network circuit by the first DC bus.
Further, booster circuit also comprises: the second energy storage inductor, and the first end of the second energy storage inductor is connected with the output of solar battery array; The second diode, the first end of the second diode is connected with the second end of the second energy storage inductor; The second power switch pipe, the first end of the second power switch pipe is connected with the second end of the second energy storage inductor, the second end ground connection of the second power switch pipe, the control end of the second power switch pipe is connected with control circuit; The first end of the first storage capacitor is connected with the second end of the second diode; And the second end of the second diode is connected with commutation inversion parallel network circuit by the first DC bus.
Further, control circuit comprises: the first current collector, is connected with the output of solar battery array, for gathering the output current of solar battery array; Second voltage collector, is connected with the output of solar battery array, for gathering the output voltage of solar battery array; And first signal generation unit, be connected with the first current collector and the first voltage collector respectively.
Further, commutation inversion parallel network circuit comprises: intelligent power circuit, and intelligent power circuit is connected with booster circuit by the first DC bus, and the control end of intelligent power circuit is connected with control circuit; The 3rd energy storage inductor, the first end of the 3rd energy storage inductor is connected with intelligent power circuit, and the second end of the 3rd energy storage inductor and the first-phase of utility network are connected in first node; The 4th energy storage inductor, the first end of the 4th energy storage inductor is connected with intelligent power circuit, and the second end of the 4th energy storage inductor and the second-phase of utility network are connected in Section Point; The 5th energy storage inductor, the first end of the 5th energy storage inductor is connected with intelligent power circuit, and the second end of the 5th energy storage inductor and the third phase of utility network are connected in the 3rd node; The first subtracter, is connected with first node and Section Point respectively; The second subtracter, is connected with Section Point and the 3rd node respectively; And output, first node and the Section Point of the output of the first subtracter, the second subtracter are connected with control circuit respectively.
Further, control circuit comprises: second voltage collector, and second voltage collector is connected with the first subtracter and the second subtracter; The second current collector, the second current collector is connected with first node and Section Point respectively; And secondary signal generation unit, be connected with second voltage collector and the second current collector respectively.
Adopt the utility model, solar air-conditioner system comprises solar battery array, photovoltaic current transformer, air-conditioning unit and utility network, booster circuit in photovoltaic current transformer and commutation inversion parallel network circuit can be controlled by the output voltage to solar panel by the maximum power output control signal of control circuit, thereby realize maximum power point tracking (being MPPT); Commutation inversion parallel network circuit switches between rectification and the operating state of inversion grid connection by state switch-over control signal, to use the energy of utility network and solar battery array as the power supply of air-conditioning unit, and the energy feedback utility network of control solar battery array, thereby can realize full-controlled rectifier and inversion grid connection, i.e. energy capable of bidirectional flowing.Adopt the utility model, do not need accumulators store energy, can be by the energy feedback of commutation inversion parallel network circuit control solar battery array to utility network, and use said structure can expand air-conditioning power grade, the excess energy that has solved the output of available technology adopting solar battery array can not feedback grid, the high cost that uses storage battery to cause, and air-conditioning power grade is little, use occasion is limited, the problem of the high popularization difficulty of bringing of input cost, realize solar power generation excess energy feedback grid, air-conditioning power grade and use occasion have been expanded simultaneously, thereby alleviate the situation of electric energy anxiety, create considerable economic interests, and do not need storage battery to reduce costs, air-conditioning power grade and use occasion are expanded, make this solar air-conditioner system there are wide market prospects.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation according to a kind of solar air-conditioner system of the prior art;
Fig. 2 is the structural representation according to another solar air-conditioner system of the prior art;
Fig. 3 is according to the structural representation of the solar air-conditioner system of the utility model embodiment;
Fig. 4 is according to the structural representation of a kind of optional solar air-conditioner system of the utility model embodiment;
Fig. 5 is according to the circuit diagram of the booster circuit of the solar air-conditioner system of the utility model embodiment;
Fig. 6 is according to the circuit diagram of the booster circuit of a kind of optional solar air-conditioner system of the utility model embodiment;
Fig. 7 is solar battery array output current, voltage and power relation (I-V) curve chart according to the utility model embodiment;
Fig. 8 is according to the circuit diagram of the commutation inversion parallel network circuit of the solar air-conditioner system of the utility model embodiment;
Fig. 9 is the control block diagram in rectification state according to commutation inversion parallel network circuit embodiment illustrated in fig. 8; And
Figure 10 is the control block diagram in inversion grid connection state according to commutation inversion parallel network circuit embodiment illustrated in fig. 8.
Embodiment
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
Fig. 3 is according to the structural representation of the solar air-conditioner system of the utility model embodiment.As shown in Figure 3, this system can comprise: solar battery array 100; Photovoltaic current transformer 200, photovoltaic current transformer is connected between solar battery array 100 and utility network 400; Air-conditioning unit 300, is connected with photovoltaic current transformer 200; Wherein, photovoltaic current transformer comprises: booster circuit 210, commutation inversion parallel network circuit 230 and control circuit (not shown in Fig. 3), control circuit is connected between booster circuit 210 and solar battery array 100, and control circuit is for sending maximum power output control signal according to the output current of solar battery array 100 and output voltage to booster circuit 210; Control circuit is connected with commutation inversion parallel network circuit 230, solar battery array 100 and air-conditioning unit 300 respectively, for sending state switch-over control signal according to the operate power of the power output of solar battery array 100 and air-conditioning unit 300 to commutation inversion parallel network circuit 230; Booster circuit 210 is connected with solar battery array 100, for passing through maximum power output control signal control solar battery array 100 Maximum Power Outputs; And commutation inversion parallel network circuit 230 is connected between booster circuit 210 and utility network 400, for switching between rectification and the operating state of inversion grid connection by state switch-over control signal, to use the energy of utility network and solar battery array as the power supply of air-conditioning unit, and control the energy feedback utility network of solar battery array.
Adopt the utility model, solar air-conditioner system comprises solar battery array, photovoltaic current transformer, air-conditioning unit and utility network, booster circuit in photovoltaic current transformer and commutation inversion parallel network circuit can be controlled by the output voltage to solar panel by the maximum power output control signal of control circuit, thereby realize maximum power point tracking (being MPPT); Commutation inversion parallel network circuit switches between rectification and the operating state of inversion grid connection by state switch-over control signal, to use the energy of utility network and solar battery array as the power supply of air-conditioning unit, and the energy feedback utility network of control solar battery array, thereby can realize full-controlled rectifier and inversion grid connection, i.e. energy capable of bidirectional flowing.Adopt the utility model, do not need accumulators store energy, can be by the energy feedback of commutation inversion parallel network circuit control solar battery array to utility network, and use said structure can expand air-conditioning power grade, the excess energy that has solved the output of available technology adopting solar battery array can not feedback grid, the high cost that uses storage battery to cause, and air-conditioning power grade is little, use occasion is limited, the problem of the high popularization difficulty of bringing of input cost, realize solar power generation excess energy feedback grid, air-conditioning power grade and use occasion have been expanded simultaneously, thereby alleviate the situation of electric energy anxiety, create considerable economic interests, and do not need storage battery to reduce costs, air-conditioning power grade and use occasion are expanded, make this solar air-conditioner system there are wide market prospects.
In above-described embodiment of the present utility model, can in the output voltage range of wider solar battery array, realize maximum power point tracking (MPPT) by booster circuit, thereby no matter under which type of weather conditions, solar cell can Maximum Power Output, guarantees optimum use solar power generation.
In above-described embodiment of the present utility model, as shown in Figure 4, solar air-conditioner system can also comprise: circuit 500 confluxes, the circuit 500 that confluxes is connected between solar battery array 100 and booster circuit 210, and the direct current that solar battery array 100 is exported is inputted the first DC bus 260 by booster circuit 210 after confluxing by the circuit that confluxes; The first DC bus 260, booster circuit 210 is connected with commutation inversion parallel network circuit 230 by the first DC bus 260; The first end of the second DC bus 310, the second DC buss 310 is connected with the first DC bus 260, and the second end of the second DC bus 310 is connected with air-conditioning unit 300.
Wherein, the first DC bus is inverter DC bus, and the second DC bus is air-conditioning DC bus, and booster circuit is BOOST booster circuit.
Particularly, as shown in Figure 4, the direct current that solar battery array 100 is exported is directly inputted to the first DC bus after conflux circuit 500 and booster circuit 210, and inverter DC bus is directly connected with air-conditioning DC bus.
In above-described embodiment of the present utility model, air-conditioning unit 300 can comprise: compressor inverter circuit 320, compressor inverter circuit 320 receives the energy supply direct current of photovoltaic current transformer 200 by the second DC bus 310, compressor inverter circuit 320 is connected with compressor (not shown), for energy supply DC inverter being become to the alternating current of drive compression machine; Two blower fan inverter circuits (the first blower fan inverter circuit 330 and the second blower fan inverter circuit 340), two blower fan inverter circuits receive the energy supply direct current of photovoltaic current transformer 200 by the second DC bus 310, blower fan inverter circuit is connected with blower fan (not shown), for energy supply DC inverter being become to drive the alternating current of blower fan; Compressor inverter circuit comprises first control circuit, and blower fan inverter circuit comprises second control circuit; Switching Power Supply 350, be connected with first control circuit, second control circuit, air-conditioning governor circuit and air-conditioning unit DC load respectively, Switching Power Supply receives the energy supply direct current of photovoltaic current transformer by the second DC bus, Switching Power Supply is for becoming energy supply direct current into low-voltage DC, for first control circuit, second control circuit, air-conditioning governor circuit and air-conditioning unit DC load provide the working power of direct current.
Wherein, air conditioner DC load can comprise low-voltage direct load, comprises valve class, each sensor load; Switching Power Supply 350 in above-described embodiment is connected with compressor inverter circuit 320, two blower fan inverter circuits, air-conditioning governor circuit 360 and air conditioner DC load 370 respectively.
Particularly, the first control circuit in compressor inverter circuit 320 and blower fan inverter circuit and second control circuit can be controlled conducting or the disconnection of each switching tube in inverter circuit; And the work of first control circuit and second control circuit can realize control by the control signal of sending of air-conditioning governor circuit 360.
In solar air-conditioner system in Fig. 4, each inverter circuit can be respectively frequency-changeable compressor inverter circuit, frequency conversion fan inverter circuit.Frequency-changeable compressor inverter circuit is connected with air-conditioning DC bus with frequency conversion fan inverter circuit, the energy supply DC inverter of the high pressure of photovoltaic current transformer is become the alternating current of frequency and voltage variable for driving frequency-changeable compressor and frequency conversion fan; Switching Power Supply is also connected with air-conditioning DC bus, and the energy supply direct current of high pressure is become to low-voltage DC, for each inverter circuit, air-conditioning governor circuit and air conditioner DC load provide the DC supply of low pressure.Wherein, the voltage of the DC supply of compressor inverter circuit, two blower fan inverter circuits can be 15V, the voltage of the DC supply of air-conditioning governor circuit can be 24V, and the voltage of the DC supply of air conditioner DC load is the voltage that 36V meets human-body safety below; The control signal of Switching Power Supply is provided by air-conditioning governor circuit, improves complete machine fail safe.
The first DC bus and the second DC bus (being the thick line of black in the drawings) are electrical source of power as shown in Figure 4, this electrical source of power is the high voltage direct current of hundreds of volts, and dotted line in Fig. 4 is the low-voltage DC through Switching Power Supply conversion, particularly, use this low-voltage DC for all controllers in air-conditioning unit (comprising the control circuit in air-conditioning governor circuit and each inverter circuit) and DC load power supply.What be also the air-conditioning unit shown in Fig. 4 by the second DC bus access is high-tension electricity, in addition be all the low tension lower than human safety voltage, increase like this fail safe of air-conditioning unit, and reduce the electromagnetic interference in air-conditioning unit, air-conditioning unit can be moved with security and stability.
In scheme of the present utility model, adopt said structure, the load voltage of the each system in inside of air-conditioning unit is the direct current of low pressure, both improve the fail safe of unit, reduced again the interlaced electromagnetic interference problem bringing between inner dissimilar power supply, improved unit antijamming capability.
According to above-described embodiment of the present utility model, solar air-conditioner system can also comprise: communication link 600, photovoltaic current transformer and air-conditioning unit carry out communication by communication link.
Particularly, between photovoltaic current transformer and air-conditioning unit, can communicate by communication link 600, can transmit the power output of solar battery array 100, operate power and the running status etc. of air-conditioning unit by communication link.
In above-described embodiment of the present utility model, booster circuit 210 can comprise as shown in Figure 5 and Figure 6: the first energy storage inductor L1, and the first end of the first energy storage inductor is connected with the output of solar battery array; The first diode D1, the first end of the first diode is connected with the second end of the first energy storage inductor; The first power switch pipe Q1, the first end of the first power switch pipe is connected with the second end of the first energy storage inductor, the second end ground connection of the first power switch pipe, the control end of the first power switch pipe is connected with control circuit, for receiving maximum power output control signal; The first storage capacitor C1, the first end of the first storage capacitor is connected with the second end of the first diode, the second end ground connection of the first storage capacitor; And the second end of the first diode is connected with commutation inversion parallel network circuit by the first DC bus.
Particularly, in the time of the first power switch pipe Q1 conducting, the electric current of the first energy storage inductor L1 increases, because inductance has the characteristic that electric current can not suddenly change, at the blocking interval of the first power switch pipe Q1, the voltage producing on the first energy storage inductor L1 adds the output voltage of solar battery array, through the first diode D1, toward the upper charging of the first storage capacitor C1, thereby the output energy of solar battery array 100 is forwarded on inverter DC bus (i.e. the first DC bus 260).The control signal PWM7 of the first power switch pipe Q1 is as shown in Figure 5 produced by control circuit 280.
According to above-described embodiment of the present utility model, booster circuit can also comprise as shown in Figure 6: the second energy storage inductor L2, and the first end of the second energy storage inductor is connected with the output of solar battery array 100; The second diode D2, the first end of the second diode is connected with the second end of the second energy storage inductor; The second power switch pipe Q2, the first end of the second power switch pipe is connected with the second end of the second energy storage inductor, the second end ground connection of the second power switch pipe, the control end of the second power switch pipe is connected with control circuit, for receiving maximum power output control signal; The first end of the first storage capacitor is connected with the second end of the second diode; And the second end of the second diode is connected with commutation inversion parallel network circuit by the first DC bus 260.
In two-way interleaved boost circuit as shown in Figure 6, the operation principle of two-way booster circuit is the same, and control signal PWM7 and the PWM8 of the first power switch pipe Q1 and the second power switch pipe Q2 are produced by control circuit 280, two-way pwm signal differ 180 °.Control owing to being that two-way is staggered, the Primary Component of circuit is only required to be the half of booster circuit as shown in Figure 5 as rated capacities such as energy storage inductor, diode and device for power switching.
In above-described embodiment of the present utility model, control circuit 280 can comprise: the first current collector, is connected with the output of solar battery array, for gathering the output current of solar battery array; Second voltage collector, is connected with the output of solar battery array, for gathering the output voltage of solar battery array; And first signal generation unit, be connected with the first current collector and the first voltage collector respectively, for generating maximum power output control signal according to output current and output voltage.
Control circuit 280, by gathering output current and the output voltage of solar battery array, generates maximum power output control signal according to output current and output voltage.Particularly, to realize the maximum power tracing (MPPT) to solar battery array be mainly the output voltage V pv that controls solar battery array by control circuit 280 to booster circuit.The characteristic of solar panel is mainly subject to the impact of intensity of illumination and temperature, and wherein electric current I pv is just becoming ratio with intensity of illumination, and temperature rising can make output voltage reduce Vpv, but less on electric current I pv impact.Under fixing intensity of illumination, solar panel characteristic curve is as shown in Figure 7:
Characteristic curve 1 as shown in Figure 7, in the time that the output current Ipv of solar battery array is zero, output voltage is Vo to the maximum, is called for short open circuit voltage; In the time that the output voltage V pv of solar battery array is zero, output current is Io to the maximum, is called for short open-circuit current; When the output voltage of solar battery array is Um, output current while being Im, power output Ppv is maximum power.Therefore, to realize maximum power tracing (MPPT) to solar cell be mainly that Um realizes by controlling solar panel output voltage to BOOST booster circuit.Due under different intensities of illumination, cell panel characteristic curve is different, is also that solar panel output voltage is that Um is different, as curve 2.
By the control of maximum power tracing (MPPT) above, even if Intensity of the sunlight is very weak, when (curve 2) open circuit voltage Vo is very little, still can reach by controlling the output voltage of solar battery array the object of power output maximum, thereby realize maximum power tracing (MPPT) in the voltage range of non-constant width, MPPT efficiency is very high.
In above-described embodiment of the present utility model, the operate power that is less than air-conditioning unit in the power output of solar battery array, it is the power supply of air-conditioning unit that the alternating current of utility network is converted into direct current, also, for the operate power that is greater than air-conditioning unit in the power output of solar battery array, the dump power that solar battery array is provided is converted into alternating current and flows to utility network.Also, commutation inversion parallel network circuit is mainly realized the control to utility network, in the time that the electric energy of solar battery array output is not enough to maintain the operation of air-conditioning unit, realizes full-controlled rectifier, supplies air-conditioning consumed energy required from utility network power taking; In the time of the electric energy abundance of solar battery array output, utility network is returned in the dump energy inversion that solar battery array is provided, and can realize energy in bidirectional flow by commutation inversion parallel network circuit.
Commutation inversion parallel network circuit can comprise as shown in Figure 8: intelligent power circuit 231, intelligent power circuit is connected with booster circuit by the first DC bus, the control end of intelligent power circuit is connected with control circuit 280, for the state switch-over control signal of reception control circuit; The 3rd energy storage inductor L3, the first end of the 3rd energy storage inductor is connected with intelligent power circuit, and the second end of the 3rd energy storage inductor and the first-phase of utility network are connected in first node J1; The 4th energy storage inductor L4, the first end of the 4th energy storage inductor is connected with intelligent power circuit, and the second end of the 4th energy storage inductor and the second-phase of utility network are connected in Section Point J2; The 5th energy storage inductor L5, the first end of the 5th energy storage inductor is connected with intelligent power circuit, and the second end of the 5th energy storage inductor and the third phase of utility network are connected in the 3rd node J3; The first subtracter 233, is connected with first node and Section Point respectively; The second subtracter 235, is connected with Section Point and the 3rd node respectively; And output, first node and the Section Point of the output of the first subtracter, the second subtracter are connected with control circuit respectively.
Wherein, the R phase that first node J1 can corresponding utility network 400, the voltage of the node reaction that first end of the 3rd energy storage inductor L3 is connected with intelligent power circuit 231 is Ua; Section Point J2 can corresponding utility network 400 S phase, the voltage of the node reaction that first end of the 4th energy storage inductor L4 is connected with intelligent power circuit 231 is Ub; The 3rd node J3 can corresponding utility network 400 T phase, the voltage of the node reaction that first end of the 5th energy storage inductor L5 is connected with intelligent power circuit 231 is Uc.
More specifically, intelligent power circuit 231 can comprise: the first power cell, the first power cell comprises the 3rd power switch pipe Q3 and the 3rd diode D3, the first end of the 3rd power switch pipe is connected with the negative pole of the 3rd diode, the second end of the 3rd power switch pipe is connected with the positive pole of the 3rd diode, the control end of the 3rd power switch pipe is connected with control circuit, for accepting state switch-over control signal; The second power cell, the second power cell comprises the 4th power switch pipe Q4 and the 4th diode D4, the first end of the 4th power switch pipe is connected with the negative pole of the 4th diode, the second end of the 4th power switch pipe is connected with the positive pole of the 4th diode, the control end of the 4th power switch pipe is connected with control circuit, for accepting state switch-over control signal; The second end of the 3rd power switch pipe and the first end of the 4th power switch pipe are connected in the 4th node, and the 4th node is connected with the first end of the 3rd energy storage inductor; The 3rd power cell, the 3rd power cell comprises the 5th power switch pipe Q5 and the 5th diode D5, the first end of the 5th power switch pipe is connected with the negative pole of the 5th diode, the second end of the 5th power switch pipe is connected with the positive pole of the 5th diode, the control end of the 5th power switch pipe is connected with control circuit, for accepting state switch-over control signal; The 4th power cell, the 4th power cell comprises the 6th power switch pipe Q6 and the 6th diode D6, the first end of the 6th power switch pipe is connected with the negative pole of the 6th diode, the second end of the 6th power switch pipe is connected with the positive pole of the 6th diode, the control end of the 6th power switch pipe is connected with control circuit, for accepting state switch-over control signal; The second end of the 5th power switch pipe and the first end of the 6th power switch pipe are connected in the 5th node, and the 5th node is connected with the first end of the 4th energy storage inductor; The 5th power cell, the 5th power cell comprises the 7th power switch pipe Q7 and the 7th diode D7, the first end of the 7th power switch pipe is connected with the negative pole of the 7th diode, the second end of the 7th power switch pipe is connected with the positive pole of the 7th diode, the control end of the 7th power switch pipe is connected with control circuit, for accepting state switch-over control signal; The 6th power cell, the 6th power cell comprises the 8th power switch pipe Q8 and the 8th diode D8, the first end of the 8th power switch pipe is connected with the negative pole of the 8th diode, the second end of the 8th power switch pipe is connected with the positive pole of the 8th diode, the control end of the 8th power switch pipe is connected with control circuit, for accepting state switch-over control signal; The second end of the 7th power switch pipe and the first end of the 8th power switch pipe are connected in the 6th node, and the 5th node is connected with the first end of the 5th energy storage inductor.
Intelligent power circuit in above-described embodiment can also comprise as shown in Figure 8: the first grading resistor R1, and the first end of the first grading resistor is connected with the first DC bus; The second grading resistor R2, the second end of the second grading resistor is connected with the second end of the first grading resistor, the second end ground connection of the second grading resistor; The second storage capacitor C2, the first end of the second storage capacitor is connected with the first end of the first grading resistor; The 3rd storage capacitor C3, the first end of the 3rd storage capacitor is connected with the second end of the second storage capacitor; The second end of the first grading resistor is connected with the second end of the second storage capacitor.
In above-described embodiment of the present utility model, control circuit can also comprise: second voltage collector, and second voltage collector is connected with the first subtracter and the second subtracter, for gathering the potential difference of the first subtracter and the output of the second subtracter; The second current collector, the second current collector is connected with first node and Section Point respectively, for gathering the node current of first node and Section Point; And secondary signal generation unit, be connected with second voltage collector and the second current collector respectively, for generating state switch-over control signal according to potential difference and node current.
Commutation inversion parallel network circuit shown in Fig. 8 is commutation inversion two-way circuit, wherein intelligent power circuit (IPM) is a three phase full bridge power device, can be divided into six power cells, each unit is combined by a power switch pipe (as IGBT pipe) and a diodes in parallel respectively.Commutation inversion parallel network circuit mainly contains two kinds of operating states: the operating state of rectification and the operating state of inversion grid connection, and its operating state is decided by control circuit, and the control signal PWM1-PWM6 of intelligent power circuit (IPM) is produced by control circuit 280.
Particularly, when the circuit working shown in Fig. 8 is during in the operating state of full-controlled rectifier, the energy flow of utility network enters photovoltaic current transformer.Its operation principle is: take R mutually as example, in the time of IGBTQ4 conducting, electric current from R through the 3rd energy storage inductor L3, flow into Q4, flow through D6 or D8, arrive S phase or T phase and the 4th energy storage inductor L4 or the 5th energy storage inductor L5, in Q4 conduction period, the 3rd energy storage inductor L3 Current rise, storage power; In the time that Q4 turn-offs, the energy that is stored in the 3rd energy storage inductor L3 flow into the electric capacity on inverter DC bus through diode D3, thereby the energy flow of utility network enters photovoltaic current transformer.Under full-controlled rectifier pattern, must regulate in real time three-phase phase current Ix (x=r, s, waveform phase t) follow phase voltage Vx (x=r, s, waveform phase t), thus improve power factor, reduce harmonic components and content.
When the circuit working shown in Fig. 8 is during in the operating state of inversion grid connection, the energy of solar battery array output flows into utility network by photovoltaic current transformer.Particularly: because photovoltaic current transformer is connected with utility network, the output voltage of photovoltaic current transformer is determined by the voltage of utility network, can reach the object toward utility network input power by the electric current of control inputs utility network; Meanwhile, the current harmonic content of input electrical network must meet GB requirement, and the therefore necessary phase place of detection of grid voltage simultaneously, to guarantee that the electric current of inputting electrical network reaches and the same requirement of homophase frequently of line voltage.
In above-described embodiment of the present utility model, the operate power that is less than air-conditioning unit in the power output of solar battery array, it is the power supply of air-conditioning unit that the alternating current of utility network is converted into direct current, also, for the operate power that is greater than air-conditioning unit in the power output of solar battery array, the dump power that solar battery array is provided is converted into alternating current and flows to utility network.
As shown in Figure 8, the interface of photovoltaic current transformer and utility network is three-phase three-wire system, there is no zero line, thereby air-conditioning unit can avoid zero live wire to connect instead, the problem of the damage air-conditioning unit electric component that power supply null offset etc. brings, improves whole aircraft reliability and fail safe.
By above-described embodiment of the present utility model, whole photovoltaic air-conditioning system can run on following five kinds of patterns: 1., in the time that air-conditioning unit is out of service, photovoltaic current transformer runs on inversion grid connection state, the whole feedback utility networks of solar battery array power output; 2. in the time that solar battery array does not generate electricity, photovoltaic current transformer runs on full-controlled rectifier state, and air-conditioning unit all uses utility network power supply; 3. in the time that solar battery array power output is greater than operation of air conditioner power (being the power that air conditioner operation consumes), part solar power is used for meeting air-conditioning unit and all consumes, redundance (being dump power) returns utility network by the inversion of photovoltaic current transformer, does not need storage battery.4. in the time that solar battery array power output is less than operation of air conditioner power, all solar power consumes for air-conditioning unit, and not enough energy part is supplied from utility network by photovoltaic current transformer again.5. in the time that solar battery array power output equals operation of air conditioner power, all solar power consumes for air-conditioning unit.
The utility model also provides a kind of control method for solar air-conditioner system, and the method can comprise the steps:
Step S102: send maximum power output control signal to booster circuit according to the output current of solar battery array and output voltage.
Step S104: send state switch-over control signal to commutation inversion parallel network circuit according to the operate power of the power output of solar battery array and air-conditioning unit.
Step S106: booster circuit is by maximum power output control signal control solar battery array Maximum Power Output.
Step S108: commutation inversion parallel network circuit switches the operating state of rectification and inversion grid connection by state switch-over control signal, to use the energy of utility network and solar battery array as the power supply of air-conditioning unit, and control the energy feedback utility network of solar battery array.
Adopt the utility model, can control by the output voltage to solar panel by the maximum power output control signal of control circuit by the booster circuit in photovoltaic current transformer and commutation inversion parallel network circuit, thereby realize maximum power point tracking (being MPPT); Between rectification and the operating state of inversion grid connection, switch by state switch-over control signal by commutation inversion parallel network circuit, to use the energy of utility network and solar battery array as the power supply of air-conditioning unit, and the energy feedback utility network of control solar battery array, thereby can realize full-controlled rectifier and inversion grid connection, i.e. energy capable of bidirectional flowing.Adopt the utility model, do not need accumulators store energy, can be by the energy feedback of commutation inversion parallel network circuit control solar battery array to utility network, and use said structure can expand air-conditioning power grade, the excess energy that has solved the output of available technology adopting solar battery array can not feedback grid, the high cost that uses storage battery to cause, and air-conditioning power grade is little, use occasion is limited, the problem of the high popularization difficulty of bringing of input cost, realize solar power generation excess energy feedback grid, air-conditioning power grade and use occasion have been expanded simultaneously, thereby alleviate the situation of electric energy anxiety, create considerable economic interests, and do not need storage battery to reduce costs, air-conditioning power grade and use occasion are expanded, make this solar air-conditioner system there are wide market prospects.
According to above-described embodiment of the present utility model, the step that sends state switch-over control signal to commutation inversion parallel network circuit according to the operate power of the power output of solar battery array and air-conditioning unit can comprise: the output voltage and the output current that gather solar battery array; The product that calculates output voltage and output current obtains the power output of solar battery array; The maximum of calculating all power outputs in Preset Time obtains maximum power; Determine the operating state of commutation inversion parallel network circuit according to maximum power and operate power; Generate and send state switch-over control signal according to operating state.
In above-described embodiment of the present utility model, determine that according to maximum power and operate power the step of the operating state of commutation inversion parallel network circuit can comprise: the difference of calculating maximum power and operate power obtains grid-connected power; In the situation that grid-connected power is 0, determine that the operating state of control commutation inversion parallel network circuit is holding state; In the situation that grid-connected power is greater than 0, determine that the operating state of control commutation inversion parallel network circuit is inversion grid connection state; In the situation that grid-connected power is less than 0, determine that the operating state of control commutation inversion parallel network circuit is rectification state; Be greater than 0 and operate power be 0 in the situation that in maximum power, determine that the operating state of controlling commutation inversion parallel network circuit is inversion grid connection state; Be 0 and operate power be greater than 0 in the situation that in maximum power, determine that the operating state of controlling commutation inversion parallel network circuit is rectification state.
Particularly, Δ P is the grid-connected power of commutation inversion parallel network circuit, Δ P=Ppv – P air-conditioning.Wherein, the maximum power of the output that Ppv is solar battery array, the operate power (air-conditioning consumed power) that P air-conditioning is air-conditioning.
In the time of Δ P=0, all solar power is for air-conditioning consumed power, and commutation inversion parallel network circuit is in holding state.
In the time of Δ P>0, solar power is greater than air-conditioning consumed power, and commutation inversion parallel network circuit works in inversion grid connection state.
In the time of Δ P<0, solar power is less than air-conditioning consumed power, and commutation inversion parallel network circuit works in full-controlled rectifier state.
In the time of Ppv>0 and P air-conditioning=0, air-conditioner standby, commutation inversion parallel network circuit works in inversion grid connection state.
In the time of Ppv=0 and P air-conditioning >0, air-conditioning consumed power is all taken from electrical network, and commutation inversion parallel network circuit works in full-controlled rectifier state.
Particularly, the operating state of controlling commutation inversion parallel network circuit in the case of determining is rectification state, and the step that generates and sends state switch-over control signal according to operating state can comprise: voltage reference value and the real-time voltage value of obtaining the first DC bus; The difference of voltage reference value and real-time voltage value is carried out to proportion integration differentiation control and obtain value and power reference; Value and power reference and real-time phase voltage value are obtained to current reference value through multiplier processing; The difference of current reference value and real-time current value is carried out obtaining phase voltage reference value after proportion integration differentiation control; Phase voltage reference value is carried out to sinusoidal pulse width modulation and obtain modulation-demodulation signal, modulation-demodulation signal is state switch-over control signal.
Be rectification state in the operating state of commutation inversion parallel network circuit, adopt dicyclo control.Wherein, as shown in Figure 9, outer shroud is Voltage loop, and major control inverter DC bus-bar voltage is fixed value VDC_REF, interior ring is electric current loop, its current reference value Ir_REF is proportional plus integral plus derivative controller by outer voltage through PID() control the value and power reference Pm of output and real-time phase voltage Vx (x=r, s, t) after multiplier M, obtain, the difference of current reference value Ir_REF and real-time current value is carried out PID control, the phase voltage reference value VPWM_X (x=r of each phase of its output, s, t), adopting SPWM(is sinusoidal pulse width modulation) modulator approach, by VPWM_X (x=r, s, t) make comparisons with default triangular carrier, produce the pwm signal (being modulation-demodulation signal) of controlling IGBT pipe.More specifically, for each phase, the pwm signal of upper and lower bridge arm IGBT pipe is complementary, i.e. conducting simultaneously.
Particularly, the operating state of controlling commutation inversion parallel network circuit in the case of determining is inversion grid connection state, and the step that generates and sends state switch-over control signal according to operating state can comprise: voltage reference value and the real-time voltage value of obtaining the first DC bus; The difference of voltage reference value and real-time voltage value is carried out to proportional plus integral control and obtain value and power reference; Value and power reference and real-time phase voltage value are obtained to current reference value through multiplier processing; The difference of current reference value and real-time current value is carried out obtaining phase voltage reference value after proportional plus integral control; Phase voltage reference value is carried out to sinusoidal pulse width modulation and obtain modulation-demodulation signal, modulation-demodulation signal is state switch-over control signal.
Be inversion grid connection state in the operating state of commutation inversion parallel network circuit, as shown in figure 10, adopt dicyclo control: outer shroud is Voltage loop, and major control inverter DC bus-bar voltage is fixed value VDC_REF and the voltage higher than utility network; Interior ring is electric current loop, its current reference value is given by outer voltage and voltage phase-locked loop (being PLL phase-locked loop), be pi controller by the difference of current reference value and real-time current value is carried out to PI() control, obtain output voltage U x (x=a, b, voltage reference value c) of the every phase of photovoltaic current transformer, then adopt SPWM modulator approach, by Ux (x=a, b, c) and triangular carrier make comparisons, produce the pwm signal of controlling IGBT pipe.For each phase, the pwm signal of upper and lower bridge arm IGBT pipe is complementary, i.e. conducting simultaneously.Wherein, PLL phase-locked loop, mainly for detection of each phase voltage phase place, reaches with line voltage with frequency homophase to reach the electric current of control inputs electrical network.
It should be noted that, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out shown or described step with the order being different from herein.
Adopt such scheme of the present utility model, whole solar air-conditioner system can be grid-connected, unnecessary amount feedback grid, do not need storage battery; Photovoltaic current transformer is made up of BOOST booster circuit, commutation inversion parallel network circuit and control circuit three parts, and BOOST booster circuit is connected by inverter DC bus with commutation inversion parallel network circuit, and inverter DC bus can be connected with air-conditioning DC bus.Between inverter and air-conditioning unit, can intercom mutually; Photovoltaic current transformer and electrical network be connected to three-phase three-wire system, there is no zero line; Air-conditioning unit inside is powered by unified Switching Power Supply, and Switching Power Supply input power is taken from air-conditioning DC bus; The air conditioner DC load of air-conditioning inside is the DC load of low pressure, without high-voltage alternating load; Two kinds of circuit topological structures of BOOST booster circuit and realize the method for maximum power tracing (MPPT), with respect to realizing grid-connected photovoltaic air-conditioning, the maximum power tracing (MPPT) that can realize in the voltage range of non-constant width solar panel, MPPT efficiency is very high.
As can be seen from the above description, the utility model has been realized following technique effect:
Adopt the utility model, solar air-conditioner system comprises solar battery array, photovoltaic current transformer, air-conditioning unit and utility network, booster circuit in photovoltaic current transformer and commutation inversion parallel network circuit can be controlled by the output voltage to solar panel by the maximum power output control signal of control circuit, thereby realize maximum power point tracking (being MPPT); Commutation inversion parallel network circuit switches between rectification and the operating state of inversion grid connection by state switch-over control signal, to use the energy of utility network and solar battery array as the power supply of air-conditioning unit, and the energy feedback utility network of control solar battery array, thereby can realize full-controlled rectifier and inversion grid connection, i.e. energy capable of bidirectional flowing.Adopt the utility model, do not need accumulators store energy, can be by the energy feedback of commutation inversion parallel network circuit control solar battery array to utility network, and use said structure can expand air-conditioning power grade, the excess energy that has solved the output of available technology adopting solar battery array can not feedback grid, the high cost that uses storage battery to cause, and air-conditioning power grade is little, use occasion is limited, the problem of the high popularization difficulty of bringing of input cost, realize solar power generation excess energy feedback grid, air-conditioning power grade and use occasion have been expanded simultaneously, thereby alleviate the situation of electric energy anxiety, create considerable economic interests, and do not need storage battery to reduce costs, air-conditioning power grade and use occasion are expanded, make this solar air-conditioner system there are wide market prospects.
The claimed calculator of the utility model and each assembly that forms this processor are all a kind of entity products that has definite shape, constructs and occupy certain space.For example, microprocessor, image processor, sub-processor etc. are all can computer equipment, terminal or server independent operating, that have particular hardware structure.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (8)
1. a solar air-conditioner system, is characterized in that, comprising:
Solar battery array;
Photovoltaic current transformer, described photovoltaic current transformer is connected between described solar battery array and utility network;
Air-conditioning unit, is connected with described photovoltaic current transformer;
Wherein, described photovoltaic current transformer comprises: booster circuit, commutation inversion parallel network circuit and control circuit,
Described control circuit is connected between described booster circuit and described solar battery array;
Described control circuit is connected with described commutation inversion parallel network circuit, described solar battery array and described air-conditioning unit respectively;
Described booster circuit is connected with described solar battery array;
Described commutation inversion parallel network circuit is connected between described booster circuit and described utility network; And
Communication link, described photovoltaic current transformer and described air-conditioning unit carry out communication by described communication link.
2. according to the solar air-conditioner system described in claim 1, it is characterized in that, described solar air-conditioner system also comprises:
The circuit that confluxes, described in the circuit that confluxes be connected between described solar battery array and described booster circuit;
The first DC bus, described booster circuit is connected with described commutation inversion parallel network circuit by described the first DC bus;
The second DC bus, the first end of described the second DC bus is connected with described the first DC bus, and the second end of described the second DC bus is connected with described air-conditioning unit.
3. according to the solar air-conditioner system described in claim 2, it is characterized in that, described air-conditioning unit comprises:
Compressor inverter circuit, described compressor inverter circuit receives the energy supply direct current of described photovoltaic current transformer by described the second DC bus, and described compressor inverter circuit is connected with compressor;
Blower fan inverter circuit, described blower fan inverter circuit receives the described energy supply direct current of described photovoltaic current transformer by described the second DC bus, and described blower fan inverter circuit is connected with blower fan;
Described compressor inverter circuit comprises first control circuit, and described blower fan inverter circuit comprises second control circuit;
Switching Power Supply, is connected with described first control circuit, described second control circuit, air-conditioning governor circuit and air-conditioning unit DC load respectively.
4. solar air-conditioner system according to claim 1, is characterized in that, described booster circuit comprises:
The first energy storage inductor, the first end of described the first energy storage inductor is connected with the output of described solar battery array;
The first diode, the first end of described the first diode is connected with the second end of described the first energy storage inductor;
The first power switch pipe, the first end of described the first power switch pipe is connected with the second end of described the first energy storage inductor, the second end ground connection of described the first power switch pipe, the control end of described the first power switch pipe is connected with described control circuit;
The first storage capacitor, the first end of described the first storage capacitor is connected with the second end of described the first diode, the second end ground connection of described the first storage capacitor; And
The second end of described the first diode is connected with described commutation inversion parallel network circuit by the first DC bus.
5. solar air-conditioner system according to claim 4, is characterized in that, described booster circuit also comprises:
The second energy storage inductor, the first end of described the second energy storage inductor is connected with the output of described solar battery array;
The second diode, the first end of described the second diode is connected with the second end of described the second energy storage inductor;
The second power switch pipe, the first end of described the second power switch pipe is connected with the second end of described the second energy storage inductor, the second end ground connection of described the second power switch pipe, the control end of described the second power switch pipe is connected with described control circuit;
The first end of described the first storage capacitor is connected with the second end of described the second diode; And
The second end of described the second diode is connected with described commutation inversion parallel network circuit by the first DC bus.
6. according to the solar air-conditioner system described in claim 4 or 5, it is characterized in that, described control circuit comprises:
The first current collector, is connected with the output of described solar battery array, for gathering the output current of described solar battery array;
Second voltage collector, is connected with the output of described solar battery array, for gathering the output voltage of described solar battery array; And
First signal generation unit, is connected with described the first current collector and described the first voltage collector respectively.
7. solar air-conditioner system according to claim 1, is characterized in that, described commutation inversion parallel network circuit comprises:
Intelligent power circuit, described intelligent power circuit is connected with described booster circuit by the first DC bus, and the control end of described intelligent power circuit is connected with described control circuit;
The 3rd energy storage inductor, the first end of described the 3rd energy storage inductor is connected with described intelligent power circuit, and the second end of described the 3rd energy storage inductor and the first-phase of described utility network are connected in first node;
The 4th energy storage inductor, the first end of described the 4th energy storage inductor is connected with described intelligent power circuit, and the second end of described the 4th energy storage inductor and the second-phase of described utility network are connected in Section Point;
The 5th energy storage inductor, the first end of described the 5th energy storage inductor is connected with described intelligent power circuit, and the second end of described the 5th energy storage inductor and the third phase of described utility network are connected in the 3rd node;
The first subtracter, is connected with described first node and described Section Point respectively;
The second subtracter, is connected with described Section Point and described the 3rd node respectively; And
The output of described the first subtracter, the output of described the second subtracter, described first node and described Section Point are connected with described control circuit respectively.
8. solar air-conditioner system according to claim 7, is characterized in that, described control circuit comprises:
Second voltage collector, described second voltage collector is connected with described the first subtracter and described the second subtracter;
The second current collector, described the second current collector is connected with described first node and described Section Point respectively; And
Secondary signal generation unit, is connected with described second voltage collector and described the second current collector respectively.
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