CN105135569A - Photovoltaic air conditioner system and control method thereof - Google Patents
Photovoltaic air conditioner system and control method thereof Download PDFInfo
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- CN105135569A CN105135569A CN201510580046.XA CN201510580046A CN105135569A CN 105135569 A CN105135569 A CN 105135569A CN 201510580046 A CN201510580046 A CN 201510580046A CN 105135569 A CN105135569 A CN 105135569A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
- F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
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Abstract
The invention discloses a photovoltaic air conditioner system. The photovoltaic air conditioner system comprises an air conditioner load, a photovoltaic cell array, an energy storing device, a DC/DC convertor, a maximum power point tracing device and a control device, wherein the maximum power point tracking device calculates output power P<pv>(k) in a current control cycle according to a photovoltaic voltage U<pv>(k) and a photovoltaic current I<pv>(k) which are output by the photovoltaic cell array in the current control cycle, obtains output power P<pv>(k-1) in a previous control cycle according to a photovoltaic voltage U<pv>(k-1) and a photovoltaic current I<pv>(k-1) in the previous control cycle and disturbs a reference current of a next control cycle according to the P<pv>(k), the P<pv>(k-1), the U<pv>(k) and the U<pv>(k-1) so as to adjust output power of the DC/DC convertor; the control device controls charging and discharging of the energy storing device according to the output power of the DC/DC convertor and controls the electricity supply of the air conditioner load. The photovoltaic air conditioner system can increase the photoelectric conversion rate and improve the system stability. The invention further discloses a control method of the photovoltaic air conditioner system.
Description
Technical field
The invention belongs to electrical equipment manufacturing technology field, particularly relate to a kind of PV air-conditioner system, and the control method of this PV air-conditioner system.
Background technology
At present, air-conditioning consumes a large amount of electric energy while building comfortable indoor environment for the mankind, becomes the vast scale accounting for household electricity.According to incompletely statistics, 2013, idle call electricity was 3/5 of the annual resident living power utility of China.The COP (Energy Efficiency Ratio) and tapping a new source of energy improving existing air-conditioning technical becomes and reduces air-conditioner to the only path of the great demand of electric energy, is also promote China's energy-saving and emission-reduction, the important measures of energy resource structure transition.
At present, PV air-conditioner has two kinds of power supply modes, the first power supply mode is, when outdoor optical according to time sufficient by photovoltaic power generation apparatus for PV air-conditioner provides electric energy, unnecessary electric energy is to charge in batteries, the second power supply mode is, when outdoor optical is according to time not enough, is worked in coordination with as air-conditioning is powered by grid-connected photovoltaic system and civil power.Wherein, above-mentioned needs in the first power supply mode increases photovoltaic inverter, battery and modulator, adds system cost; And need to increase grid side fairing in the second power supply mode.But, two kinds of power supply modes in order to ensure PV air-conditioner and normally run and photovoltaic generating system from grid-connected, do not maximally utilise solar energy.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the present invention needs to propose a kind of PV air-conditioner system, and this system can improve the utilization rate of solar energy, improves photoelectric conversion rate.
The present invention also proposes the control method of this PV air-conditioner system.
In order to solve the problem, one aspect of the present invention proposes a kind of PV air-conditioner system, and this PV air-conditioner system comprises: air conditioner load, photovoltaic battery array and energy storage device; DC/DC converter, described DC/DC converter is used for the direct current be converted to by the direct current that described photovoltaic battery array exports needed for described air conditioner load work; Maximum power point tracking device, the photovoltaic voltage U that described maximum power point tracking device exports according to photovoltaic battery array described in current control period
pv(k) and photovoltaic electric current I
pvk () calculates current control period power output P
pv(k), and according to the photovoltaic voltage U of a upper control cycle
pvand photovoltaic electric current I (k-1)
pv(k-1) the power output P of a upper control cycle is obtained
pv(k-1), and according to P
pv(k), P
pv(k-1), U
pv(k) and U
pv(k-1) reference current of next control cycle of disturbance is to regulate the power output of described DC/DC converter, is operated in maximum power point to make described photovoltaic battery array; Control device, the discharge and recharge of described control device energy storage device according to the output power of described DC/DC converter and the power supply of described air conditioner load is controlled.
According to PV air-conditioner system of the present invention, maximum power point tracking device searches maximum power point by the reference current in continuous disturbance control cycle, the output current of maximum power point reference current and DC/DC converter realizes interlock, system stability and make solar battery array with maximum power output fast can be realized, improve photoelectric transformation efficiency.
Further, described maximum power point tracking device comprises PPT controller and a PWM device, and wherein, described MPPT controller is used for carrying out following process: meeting P
pv(k) > P
pv(k-1), time, judge whether further to meet U
pv(k) > U
pv(k-1), if met, then export and reduce reference current signal to regulate dutycycle to reduce the power output of described DC/DC converter by a described PWM device, if do not met, then export and increase reference current signal to regulate dutycycle to increase the power output of described DC/DC converter by a described PWM device.
Described MPPT controller is also for carrying out following process: do not meeting P
pv(k) > P
pv(k-1), time, judge whether to meet P
pv(k) < P
pv(k-1), if meet P
pv(k) < P
pv(k-1), judge whether further to meet U
pv(k) > U
pv(k-1), if met, then export and increase reference current signal to regulate dutycycle to increase the power output of described DC/DC converter by a described PWM device, if do not met, then export and reduce reference current signal to regulate dutycycle to reduce the power output of described DC/DC converter by a described PWM device.
Described MPPT controller is also for carrying out following process: do not meeting P
pv(k) > P
pvand do not meet P (k-1)
pv(k) < P
pv(k-1), time, judge whether further to meet U
pv(k)=U
pv(k-1), if meet U
pv(k)=U
pv(k-1), then current described reference current is maintained.
Said system also comprises: follow the trail of adjusting device, and described tracking adjusting device is used for carrying out attitude regulation to described photovoltaic battery array, and described tracking adjusting device comprises: light sensor, for present orientation angle and the present level angle of the trace detection sun; Timer; Controller, described controller obtains the current time data of described timer, and true bearing angle and the actual height angle of corresponding described photovoltaic battery array is obtained according to described current time data, export according to the present orientation angle of the described sun and the true bearing angle of described photovoltaic battery array and turn to conditioning signal, and export pitch regulation signal according to the present level angle of the described sun and the actual height angle of described photovoltaic battery array; First drive motors and turn to governor motion, described first drive motors according to described in turn to conditioning signal pass through described in turn to the between east and west parallactic angle of governor motion to described photovoltaic battery array to regulate; With the second drive motors and pitching adjusting mechanism, described second drive motors is regulated by the elevation angle of described pitching adjusting mechanism to described photovoltaic battery array according to described pitch regulation signal.
Further, said system also comprises: inverter circuit, the DC side of described inverter circuit is connected with described DC/DC converter, and the AC of described inverter circuit is connected with electrical network with described air conditioner load respectively, for direct current being converted to the alternating current needed for described air conditioner load work; Inverter drive, described inverter drive drives described inverter circuit according to control signal; Grid-connected sychronisation, described grid-connected sychronisation comprises: current sensor, the current value of the alternating current that the AC for detecting described inverter circuit exports; Synchronizing indicator, for detecting the synchronizing signal of described electrical network; Pi regulator, described pi regulator obtains the DC voltage of the DC side of described inverter circuit and the synchronizing signal of described electrical network, and carries out PI adjustment to described DC voltage, the signal after being regulated by PI and described synchronizing signal computing, and exports operation result; 2nd PWM device, the current value that described 2nd PWM device detects according to described current sensor and described operation result generate pwm control signal, and described pwm control signal is transferred to described inverter drive.
Based on said system, the present invention proposes a kind of control method of PV air-conditioner system on the other hand, wherein, described PV air-conditioner system comprises air conditioner load, photovoltaic battery array, energy storage device, DC/DC converter, maximum power point tracking device and control device, and described control method comprises the following steps: the photovoltaic voltage U that described maximum power point tracking device exports according to photovoltaic battery array described in current control period
pv(k) and photovoltaic electric current I
pvk () calculates kth control cycle power output P
pv(k), and according to the photovoltaic voltage U of a upper control cycle
pvand photovoltaic electric current I (k-1)
pv(k-1) the power output P of a upper control cycle is obtained
pv(k-1), and according to P
pv(k), P
pv(k-1), U
pv(k) and U
pv(k-1) reference current of next control cycle of disturbance is to regulate the power output of described DC/DC converter, is operated in maximum power point to make described photovoltaic battery array; And the discharge and recharge of described control device energy storage device according to the output power of described DC/DC converter and the power supply of described air conditioner load is controlled.
According to the control method of PV air-conditioner system of the present invention, maximum power point tracking device searches maximum power point by the reference current in continuous disturbance control cycle, the output current of maximum power point reference current and DC/DC converter realizes interlock, system stability and make solar battery array with maximum power output fast can be realized, improve photoelectric transformation efficiency.
Further, described maximum power point tracking device comprises MPPT controller and a PWM device, according to P
pv(k), P
pv(k-1), U
pv(k) and U
pv(k-1) reference current of next control cycle of disturbance is to regulate the power output of described DC/DC converter, specifically comprises: described MPPT controller judges whether to meet P
pv(k) > P
pv(k-1); If meet P
pv(k) > P
pv(k-1), described MPPT controller judges whether to meet U further
pv(k) > U
pv(k-1); If meet P
pv(k) > P
pv(k-1), then described MPPT controller exports reduction reference current signal to regulate dutycycle to reduce the power output of described DC/DC converter by a described PWM device; If do not meet P
pv(k) > P
pv(k-1), then described MPPT controller exports increase reference current signal to regulate dutycycle to increase the power output of described DC/DC converter by a described PWM device.
Further, if do not meet P
pv(k) > P
pv(k-1), then described MPPT controller judges whether to meet P further
pv(k) < P
pv(k-1); If meet P
pv(k) < P
pv(k-1), described MPPT controller judges whether to meet U further
pv(k) > U
pv(k-1); If meet U
pv(k) > U
pv(k-1), then described MPPT controller exports increase reference current signal to regulate dutycycle to increase the power output of described DC/DC converter by a described PWM device; And if do not meet U
pv(k) > U
pv(k-1), then described MPPT controller exports reduction reference current signal to regulate dutycycle to reduce the power output of described DC/DC converter by a described PWM device.
Further, if do not meet P
pv(k) > P
pvand do not meet P (k-1)
pv(k) < P
pv(k-1), described MPPT controller judges whether to meet U further
pv(k)=U
pv(k-1), if meet U
pv(k)=U
pv(k-1), then current described reference current is maintained.
Accompanying drawing explanation
Fig. 1 is the block diagram of PV air-conditioner system according to an embodiment of the invention;
Fig. 2 is the block diagram of PV air-conditioner system according to another embodiment of the invention;
Fig. 3 is the P-U characteristic curve schematic diagram of the photovoltaic battery array according to a specific embodiment of the present invention;
Fig. 4 is the flow chart regulated the attitude of photovoltaic battery array according to a specific embodiment of the present invention;
Fig. 5 is the connection diagram of PV air-conditioner system according to still a further embodiment;
Fig. 6 is the circuit diagram of the PV air-conditioner system according to a specific embodiment of the present invention;
Fig. 7 is the circuit diagram of the PV air-conditioner system according to another specific embodiment of the present invention;
Fig. 8 is the flow chart of the control method of PV air-conditioner system according to an embodiment of the invention;
Fig. 9 is to the flow chart of the MPPT maximum power point tracking of photovoltaic battery array according to the realization of another specific embodiment of the present invention.
Reference numeral:
PV air-conditioner system 1000,
Air conditioner load 100, photovoltaic battery array 200, maximum power point tracking device 300, control device 400 and energy storage device 500, DC/DC converter 600, MPPT controller 310 and a PWM device 320, inverter circuit 900, inverter drive 800,
Light sensor 301, timer 302, controller 303, first drive motors 304, turn to governor motion 305, second drive motors 306 and pitching adjusting mechanism 307, current sensor 120, synchronizing indicator 130, pi regulator 140 and the 2nd PWM device 150, filter circuit 10 and electrical network 20.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The PV air-conditioner system and control method thereof that propose according to the embodiment of the present invention are described with reference to the accompanying drawings.
First the PV air-conditioner system of the embodiment of the present invention is described.
Fig. 1 is the block diagram of PV air-conditioner system according to an embodiment of the invention, as shown in Figure 1, this PV air-conditioner system 1000 comprises air conditioner load 100, photovoltaic battery array 200, maximum power point tracking device 300, control device 400, energy storage device 500 and DC/DC converter 600.
In actual applications, the output direct current of photovoltaic battery array 200 can not meet loading demand, the direct current that photovoltaic battery array 200 exports can be converted to air conditioner load 100 work required direct current by DC/DC converter 600.
In order to improve photoelectric transformation efficiency, photovoltaic battery array 200 can be made to be operated in maximum power point by maximum power point tracking device 300, improving the utilization rate to solar energy.In an embodiment of the present invention, the pursive strategy of maximum power point is based on disturbance observation, with conventional disturbance observation unlike, the disturbance observation of maximum power point tracking device 300 is based on consistent with DC/DC converter 600 control strategy, maximum power point is searched by the reference current in continuous disturbance control cycle, interlock is realized by the output current of maximum power point reference current and DC/DC converter 600, the stability reached photovoltaic battery array 200 generates electricity controls, this control procedure is for familial distribution of cases formula photovoltaic generating system, especially for the situation that convertible frequency air-conditioner load increases suddenly, system stability and maximum power output fast can be realized by interlock.
The output voltage that namely namely ratio juris increase at set intervals or reduce photovoltaic battery array 200 is observed in disturbance, wherein, can be referred to as a control cycle before this subparameter (reference current) change and next time parameter change.In an embodiment of the present invention, maximum power point tracking device 300 obtains the photovoltaic voltage U that photovoltaic battery array 200 exports in current control period
pv(k) and photovoltaic electric current I
pvk (), according to the photovoltaic voltage U that photovoltaic battery array in current control period exports
pv(k) and photovoltaic electric current I
pvk () calculates current control period power output P
pv(k), and according to the photovoltaic voltage U of a upper control cycle
pvand photovoltaic electric current I (k-1)
pv(k-1) the power output P of a upper control cycle is obtained
pv(k-1), and according to P
pv(k), P
pv(k-1), U
pv(k) and U
pv(k-1) reference current of next control cycle of disturbance is to regulate the power output of DC/DC converter 600, is operated in maximum power point to make photovoltaic battery array 200.
Control device 400 is according to the discharge and recharge of the output power energy storage device 500 of DC/DC converter 600 and control the power supply of air conditioner load 100.Particularly, the direct current that photovoltaic battery array 200 produces, in off-grid situation, be energy storage device 500 on the one hand, such as batteries, capacitor energy storage system, charge, on the other hand for air conditioner load 100 provides electric energy, directly for air conditioner load 100 provides alternation direct current, the direct current supply of the full direct current air conditioning system of photovoltaic can be realized.When illumination is not enough, powered for air conditioner load 100 by energy storage device 500 and photovoltaic battery array 200 simultaneously.
Can find out, the PV air-conditioner system 1000 of the embodiment of the present invention, maximum power point tracking device 300 searches maximum power point by the reference current in continuous disturbance control cycle, the output current of maximum power point reference current and DC/DC converter 600 realizes interlock, can realize system stability and make solar battery array improve photoelectric transformation efficiency with maximum power output fast.
Further, as shown in Figure 2, maximum power point tracking device 300 comprises MPPT controller 310 and a PWM device 320, realized the tracking of the maximum power point of photovoltaic battery array 200 under the present circumstances by MPPT controller 310 and a PWM device 320, make photovoltaic battery array 200 with maximum power output.
MPPT controller 310 obtains the photovoltaic voltage and photovoltaic electric current that photovoltaic battery array 200 exports in current control period, and judge the affiliated area of the operating point of photovoltaic battery array 200 on characteristic curve according to this photovoltaic voltage and the photovoltaic voltage of photovoltaic electric current and a upper control cycle and the photovoltaic electric current of a upper control cycle, and according to photovoltaic battery array 200 affiliated area output regulation signal, one PWM device 320 according to conditioning signal output pwm signal with the dutycycle of control DC/DC converter 600, reach the object of disturbance reference current, maximum power point is operated in make photovoltaic battery array 200.
Particularly, after photovoltaic cell system is subject to small sample perturbations, MPPT controller 310 reads the photovoltaic voltage and photovoltaic electric current that in current control period such as kth control cycle, photovoltaic battery array 200 exports, and MPPT controller 310 carries out following process: the photovoltaic voltage U exported according to photovoltaic battery array 200 in kth control cycle
pv(k) and photovoltaic electric current I
pvk () calculates kth control cycle power output P
pv(k), and according to the photovoltaic voltage of a upper control cycle and the power output P of the upper control cycle of photovoltaic electric current acquisition
pv(k-1), by P
pv(k) and P
pv(k-1) compare, judge that whether maximum power point tracking perturbation direction is correct with this.First, judge whether to meet P
pv(k) > P
pv(k-1), P is being met
pv(k) > P
pv(k-1) time, judge that operating point is in the affiliated area of solar-energy photo-voltaic cell characteristic curve P-U according to the change of photovoltaic voltage further, such as Figure 3 shows that photovoltaic battery array 200 photovoltaic property curve synoptic diagram, judge that operating point belongs to left half-court or right half-court, judge the size of air conditioner load 100 with this.Particularly, judge whether to meet U
pv(k) > U
pv(k-1), if met, think that operating point is in the characteristic left half-court of P-U, then export and reduce reference current signal to regulate dutycycle to reduce the power output of DC/DC converter 600 by a PWM device 320, such as, I
ref=I
ref-Δ I, wherein, I
reffor reference current signal amplitude, Δ I is reference current range-adjusting value; If do not met, think that operating point works in the characteristic right half-court of P-U, then export and increase reference current signal to regulate dutycycle to increase the power output of DC/DC converter 600 by a PWM device 320, such as, I
ref=I
ref+ Δ I.
MPPT controller 310 is also for carrying out following process: do not meeting P
pv(k) > P
pv(k-1), time, judge whether to meet P
pv(k) < P
pv(k-1), if meet P
pv(k) < P
pv(k-1), judge that operating point is in the characteristic region of P-U according to the change of photovoltaic voltage further.Particularly, judge whether to meet U
pv(k) > U
pv(k-1), if met, think that operating point is in the characteristic right half-court of P-U, then export and increase reference current signal to regulate dutycycle to increase the power output of DC/DC converter 600 by a PWM device 320, such as I
ref=I
ref+ Δ I, makes operating point move toward left half-court, and photovoltaic battery array 200 can reach maximum power point.If do not meet U
pv(k) > U
pv(k-1), think that operating point is in the characteristic left half-court of P-U, need the power output reducing DC/DC converter 600, then MPPT controller 310 exports and reduces reference current signal to regulate dutycycle to reduce the power output of DC/DC converter 600 by a PWM device 320, operating point is moved toward right half-court, realizes maximum power point tracking.
MPPT controller 310 is also for carrying out following process: do not meeting P
pv(k) > P
pvand do not meet P (k-1)
pv(k) < P
pv(k-1), time, judge whether further to meet U
pv(k)=U
pv(k-1), if meet U
pv(k)=U
pv(k-1), then current reference electric current is maintained.Particularly, at P
pv(k) > P
pvand P (k-1)
pv(k) < P
pv(k-1) when neither setting up, do not represent that now operating point is on maximum power point, because photovoltaic battery array 200 power output and characteristic curve, the impact by intensity of sunshine and surface temperature constantly changes, so maximum power point is also constantly moving, thus needing again to judge U
pv(k)=U
pv(k-1) whether set up.If U
pv(k)=U
pv(k-1) setting up, representing that present operating point is sitting on maximum power point, now without the need to changing the amplitude of reference current.If U
pv(k)=U
pv(k-1) be false, after representing that now just characteristic curve changes, photovoltaic battery array 200 power output just in time identical and oneself, need again by P
pv(k) and P
pv(k-1) compare, again compare the change of photovoltaic battery array 200 output voltage, judge that operating point is in the characteristic left half-court of P-U or right half-court, and then increase or reduce reference current amplitude.Wherein, each maximum power point tracking subprogram before the end, must store U
pv(k) and P
pvk a reference value that () judged as next time.
Generally speaking, above-mentioned maximum power point tracking strategy judges perturbation direction by power output in former and later two control cycles, on this basis again according to the photovoltaic voltage amplitude of two control cycles change rapidly subregion to determine the size of air conditioner load 100, and then the reference current I of adjustment DC/DC converter 600
refrealize maximum power output.Especially, time identical for the photovoltaic voltage amplitude of former and later two control cycles, increase the closed-loop control that this judgement can realize the fast and stable that MPPT follows the tracks of, narrowed power stage point at maximum power point P
maxsearch Area, minimizing system adopts conventional disturbance observation at P
maxthe concussion of some left and right, improves photoelectric transformation efficiency and the stability of a system.
In order to improve the photoelectric transformation efficiency of photovoltaic battery array 200 further, in one embodiment of the invention, as shown in Figure 2, PV air-conditioner system 1000 also comprises follows the trail of adjusting device 700, follow the trail of adjusting device 700 for following the trail of present orientation angle and the present level angle of the sun, and according to present orientation angle and present level angle, attitude regulation is carried out to photovoltaic battery array 200, such as, regulate elevation angle and the azimuth of photovoltaic battery array 200, to make photovoltaic battery array 200 just to solar illumination angle, make the elevation angle of the elevation angle of photovoltaic battery array 200 and azimuth and the sun here and now and azimuth consistent, thus the utilization rate that can improve solar energy, the photoelectric transformation efficiency of photovoltaic battery array 200 is improved.
Follow the trail of adjusting device 700 to comprise light sensor 301, timer 302, controller 303, first drive motors 304, turn to governor motion 305, second drive motors 306 and pitching adjusting mechanism 307.
Wherein, light sensor 301 is for the present orientation angle of the trace detection sun and present level angle, controller 303 obtains the current time data of timer 302, and true bearing angle and the actual height angle of corresponding photovoltaic battery array 200 is obtained according to current time data, it should be noted that, for same when and where in 1 year, the position of the sun can be thought substantially constant, so elevation angle and the azimuth of photovoltaic battery array 200 can be arranged according to the position of the sun of concrete when and where, and then controller 303 can according to the physical location of Timing photovoltaic battery array 200.
Controller 303 turns to conditioning signal according to the true bearing angle output of the present orientation angle of the sun and photovoltaic battery array 200, and exports pitch regulation signal according to the present level angle of the sun and the actual height angle of photovoltaic battery array 200.First drive motors 304 turns to the parallactic angle between east and west of governor motion 305 pairs of photovoltaic battery arrays 200 to regulate according to turning to conditioning signal to pass through, and the second drive motors 306 regulates according to the elevation angle of pitch regulation signal by pitching adjusting mechanism 307 pairs of photovoltaic battery arrays 200.Can find out, in embodiments of the present invention, adopt dual-axis tracking system, be reached by the tracking of the elevation angle in transmeridional Bearings tracking and north-south and make photovoltaic battery array 200 can all the time just to the illumination angle of the sun.
Particularly, when sunlight is radiated at photovoltaic battery array 200, following the trail of adjusting device 300 can according to the position of photovoltaic battery array 200, regulate elevation angle and the azimuth of photovoltaic battery array 200, make photovoltaic battery array 200 consistent with azimuth with sun altitude, to maximally utilise the solar energy in this moment in season of this place, can be realized by the programme-control of following the trail of adjusting device 300.Such as, controller 303 obtains actual height angle h' and the true bearing angle A' of photovoltaic battery array 200 according to the time data of timer 302, simultaneously, the current location of the sun is detected by light sensor 301 such as photo resistance, in one particular embodiment of the present invention, four photo resistance are adopted to detect the position of the sun, wherein a pair photo resistance is used for accurately detecting the deflection angle and azimuth A that the sun moves from east to west, and another is used for accurately detecting the elevation angle h of the sun to photo resistance.And then h' and A' of photovoltaic battery array 200 and h and A of the sun under now this longitude and latitude compares by controller 303, then control signal is sent according to comparative result, feed back to the first drive motors 304 and the second drive motors 306, first drive motors 304 drives and turns to governor motion 305 to adjust the azimuth of photovoltaic battery array 200, second drive motors 306 drives pitching adjusting mechanism 307 to regulate the elevation angle of photovoltaic battery array 200 according to control signal, thus the attitude regulation realized photovoltaic battery array 200, make photovoltaic battery array 200 moment vertical with solar illumination angle, photovoltaic battery array 200 is effectively followed the trail of towards position of sun it, improve the utilization rate to solar energy, the generating efficiency of raising system.
As specific embodiment, as shown in Figure 4, for carrying out the flow chart of attitude regulation to photovoltaic battery array, as shown in Figure 4, specifically comprise:
S10, control device obtains the time data of timer, and according to the actual height angle h' of time data determination photovoltaic battery array and true bearing angle A'.
S20, detects current sun altitude h and present orientation angle A by photo resistance.
S30, control device calculates Δ h=h-h' and Δ A=A-A'.
S40, control device controls the first drive motors and the second drive motors according to difference.
S50, by turning to governor motion such as worm speed-down system fading margin photovoltaic battery array elevation angle and azimuth.
By following the trail of the elevation angle of the adjusting device 700 real-time tracing sun and azimuth to carry out attitude regulation to photovoltaic battery array 200, make photovoltaic battery array 200 just to solar illumination angle, thus the utilization rate that can improve solar energy, the discharge and recharge of the controlling electric energy energy storage device 500 that control device 400 exports according to photovoltaic battery array 200, and control according to the power supply of power output to air conditioner load 100 of photovoltaic battery array 200, meet the direct current supply demand of air conditioner load 100.
For the load such as AC frequency conversion air-conditioning needing Alternating Current Power Supply, then inverter is needed to carry out inversion to provide alternating current to alternating current.As shown in Figure 5, system 1000 also comprises inverter drive 800 and inverter circuit 900, wherein, the DC side of inverter circuit 900 is connected with DC/DC converter 600, the AC of inverter circuit 900 is connected with electrical network 20 with air conditioner load 100 respectively, to work required alternating current for direct current being converted to air conditioner load 100; Inverter drive 800 drives inverter circuit 900 according to control signal.Particularly, follow the trail of adjusting device 700 and connect photovoltaic battery array 200, the output of photovoltaic battery array 200 is DC/DC converter 600, the output of DC/DC converter 600 is the input of inverter circuit 900 such as DC/AC inverter input terminal and energy storage device 500, the output of inverter circuit 900 is divided into two-way, one tunnel is air conditioner load 100 input, and another road after filtering circuit 10 is connected to the grid 20.When illumination is sufficient, photovoltaic battery array 200 exports electric energy, powers on the one hand for air conditioner load 100, and another aspect provides AC energy for electrical network 20, in illumination during very weak or evening, is powered for air conditioner load 100 by energy storage device 500 and electrical network 20.
In an embodiment of the present invention, in order to obtain simple sinusoidal alternating current that is stable, high-quality, and with electrical network 20 voltage with frequency, homophase, wish by the amplitude of regulation output electric current, photovoltaic battery array 200 to be operated near maximum power point simultaneously.As shown in Figure 6, PV air-conditioner system 1000 also comprises grid-connected sychronisation, the synchronizing signal that grid-connected sychronisation is used for ac signal and the electrical network 20 exported according to inverter circuit 900 outputs control signals to inverter drive 110, inverter drive 800 drives inverter circuit 900 according to control signal, to regulate alternating current to make alternating current synchronous with power network signal, by surveying the power supply of air conditioner load 100 to interchange to grid-connected voltage x current control realization.
Further, as shown in Figure 6, grid-connected sychronisation comprises current sensor 120, synchronizing indicator 130, pi regulator 140 and the 2nd PWM device 150.Wherein, the current value of the alternating current that current sensor 120 exports for the AC detecting inverter circuit 900, synchronizing indicator 130 is for the synchronizing signal of detection of grid 20; Pi regulator 140 obtains the DC voltage of the DC side of inverter circuit 900 and the synchronizing signal of electrical network 20, and carries out PI adjustment to DC voltage, the signal after being regulated by PI and synchronizing signal computing, and exports operation result; The current value that 2nd PWM device 150 detects according to current sensor 120 and operation result generate pwm control signal, and pwm control signal is transferred to inverter drive 800, and then inverter drive 800 drives inverter circuit 900 according to pwm control signal.
Further, pi regulator 140 comprises the first comparing unit 141, PI regulon 142 and the second comparing unit 143.Wherein, the DC voltage of the DC side of inverter circuit 900 and target voltage values compare by the first comparing unit 141, and export fiducial value; PI regulon 142 carries out PI adjustment according to fiducial value, and then the signal after PI adjustment and synchronizing signal are carried out computing and export operation result by the second comparing unit 143.Particularly, in an embodiment of the present invention, select the output current of inverter circuit 900 as controlled variable, by the DC voltage U of the first comparing unit 141 by DC/DC converter 600
dcwith reference voltage U
refrelatively, and carry out computing by PI regulon 142 and electrical network AC synchronizing signal, the first stream current feedback simultaneously detected by current sensor 120 is to the 2nd PWM device 150,2nd PWM device 150 produces pwm control signal and this control signal is inputed to inverter drive 800, realize AC AC current control by regulating the switch on and off frequency of inverter circuit 900, thus the Alternating Current Power Supply realized air conditioner load 100, to realize different operating mode down coversion characteristic.Obtain alternating current instruction by computing, then introduce alternating current feedback, by the direct control to alternating current, make its trace command current value.
Put it briefly, with reference to shown in Fig. 6, the PV air-conditioner system 1000 of the embodiment of the present invention, realize gesture stability to photovoltaic battery array 200 (make its consistent with sun altitude and azimuth) by following the trail of adjusting device 700, realization is farthest to Solar use; The photovoltaic voltage fed back according to photovoltaic battery array 200 by MPPT controller 310 and a PWM device 320 and photovoltaic electric current realize MPPT maximum power point tracking; Photovoltaic power generation grid-connecting is realized according to PI adjustment by inverter drive 800, inverter circuit 900 and grid-connected sychronisation.
Particularly, regulating photovoltaic battery array 200 to follow the trail of sun altitude and azimuth in real time by following the trail of adjusting device 700, ensureing that photovoltaic battery array 200 is vertical with position of sun, thus the utilization rate to solar energy can be improved, improving photoelectric conversion rate.With this understanding, photovoltaic battery array 200 produces direct current by photoelectric effect, boosting is realized by DC/DC converter 600, generation photovoltaic voltage and photovoltaic electric current feed back to MPPT controller 310, realize MPPT maximum power point tracking by a PWM device 320, thus photovoltaic battery array 200 is with maximum power output.When from net, when illumination is sufficient, the power output of photovoltaic battery array 200 is greater than operating power needed for air conditioner load 100, electric energy is stored in electric capacity C1 and/or batteries B by a diode D1 part, and a part is powered for air conditioner load 100 by inverter circuit 900 such as DC/AC inverter (break-makes by four switches).When illumination is not enough, powered for air conditioner load 100 by batteries B and electrical network 20.In grid-connected situation, first the power output of photovoltaic battery array 200 ensures as air conditioner load 100 is powered, and secondly powers for electrical network 20, and by voltage U
dcregulate through PI and compare with the synchronizing signal of electrical network 20, feed back to the 2nd PWM device 150, in addition, inverter circuit 900 AC is through current sensor 120 sensed current signal and feed back to the 2nd PWM device 150, after PWM, 2nd PWM device 150 generates pwm control signal and is sent to inverter drive 800, inverter drive 800 controls the switch on and off of inverter circuit 900 according to pwm control signal, thus realize grid-connected voltage, Current Control, realize the power supply to AC air conditioner load 100.
For direct current alternation air-conditioning, Fig. 7 is the circuit diagram of the photovoltaic DC air-conditioning system according to another specific embodiment of the present invention, wherein, do not need inverter circuit 900 and grid-connection control system, photovoltaic battery array 200 directly for air conditioner load 100 provides alternation direct current, realizes the direct current supply of the full direct-flow air conditioner load of photovoltaic.
Based on the PV air-conditioner system of above-mentioned aspect, below the control method of the present invention's another aspect embodiment is described.
Fig. 8 is the flow chart of the control method of PV air-conditioner system according to an embodiment of the invention, and wherein, PV air-conditioner system comprises air conditioner load, photovoltaic battery array, energy storage device, DC/DC converter, maximum power point tracking device and control device.As shown in Figure 8, this control method comprises the following steps:
S1, the photovoltaic voltage U that maximum power point tracking device exports according to photovoltaic battery array in current control period
pv(k) and photovoltaic electric current I
pvk () calculates the power output P of current control period
pv(k), and according to the photovoltaic voltage U of a upper control cycle
pvand photovoltaic electric current I (k-1)
pv(k-1) the power output P of a upper control cycle is obtained
pv(k-1), and according to P
pv(k), P
pv(k-1), U
pv(k) and U
pv(k-1) reference current of next control cycle of disturbance is to regulate the power output of DC/DC converter, is operated in maximum power point to make photovoltaic battery array.
S2, control device is according to the discharge and recharge of the output power energy storage device of DC/DC converter and control the power supply of air conditioner load.
According to the control method of the PV air-conditioner system of the embodiment of the present invention, maximum power point tracking device searches maximum power point by the reference current in continuous disturbance control cycle, the output current of maximum power point reference current and DC/DC converter realizes interlock, can realize system stability and make solar battery array improve photoelectric transformation efficiency with maximum power output fast.
In order to improve photoelectric transformation efficiency further, in one embodiment of the invention, maximum power point tracking device comprises MPPT controller and a PWM device, realizes the tracking to the maximum power point of photovoltaic battery array by MPPT controller and a PWM device.The photovoltaic voltage that MPPT controller acquisition photovoltaic battery array exports in current control period and photovoltaic electric current, and judge the affiliated area of the operating point of photovoltaic battery array on characteristic curve according to this photovoltaic voltage and the photovoltaic voltage of photovoltaic electric current and a upper control cycle and the photovoltaic electric current of a upper control cycle, and according to photovoltaic battery array affiliated area output regulation signal; One PWM device with the dutycycle of control DC/DC converter, is operated in maximum power point to make photovoltaic battery array according to conditioning signal output pwm signal.
Particularly, MPPT controller is according to the photovoltaic voltage U of photovoltaic battery array output in current control period
pv(k) and photovoltaic electric current I
pvk () calculates k power output P
pv(k), and the power output P obtaining a upper cycle according to the photovoltaic voltage of a upper control cycle and photovoltaic electric current
pv(k-1); MPPT controller judges whether to meet P
pv(k) > P
pv(k-1); If meet P
pv(k) > P
pv(k-1), MPPT controller judges whether to meet U further
pv(k) > U
pv(k-1); If meet P
pv(k) > P
pv(k-1), then MPPT controller exports reduction reference current signal to regulate dutycycle to reduce the power output of DC/DC converter by a PWM device; If do not meet P
pv(k) > P
pv(k-1), then MPPT controller exports increase reference current signal to regulate dutycycle to increase the power output of DC/DC converter by a PWM device.
If do not meet P
pv(k) > P
pv(k-1), then MPPT controller judges whether to meet P further
pv(k) < P
pv(k-1); If meet P
pv(k) < P
pv(k-1), MPPT controller judges whether to meet U further
pv(k) > U
pv(k-1); If meet U
pv(k) > U
pv(k-1), then MPPT controller exports increase reference current signal to regulate dutycycle to increase the power output of DC/DC converter by a PWM device; If do not meet U
pv(k) > U
pv(k-1), then MPPT controller exports reduction reference current signal to regulate dutycycle to reduce the power output of DC/DC converter by a PWM device.
If do not meet P
pv(k) > P
pvand do not meet P (k-1)
pv(k) < P
pv(k-1), MPPT controller judges whether to meet U further
pv(k)=U
pv(k-1), if meet U
pv(k)=U
pv(k-1), then current reference electric current is maintained.
Based on above-mentioned explanation, Fig. 9 is the flow chart carrying out tracing process according to the maximum power point to photovoltaic battery array of a specific embodiment of the present invention, as shown in Figure 9, comprising:
S100, detects U
pv(k) and I
pv(k).
S110, rated output P
pv(k)=I
pv(k) × U
pv(k).
S120, judges whether to meet P
pv(k) > P
pv(k-1), if met, then enter step S130, otherwise enter step SS160.
S130, judges whether to meet U
pv(k) > U
pv(k-1), if met, enter step S140, otherwise enter step S150.
S140，I
ref＝I
ref-ΔI。
S150，I
ref＝I
ref+ΔI。
S160, judges whether to meet P
pv(k) < P
pv(k-1), if met, then enter step S170, otherwise enter step S200.
S170, judges whether to meet U
pv(k) > U
pv(k-1), if met, enter step S180, otherwise enter step S190.
S180，I
ref＝I
ref+ΔI。
S190，I
ref＝I
ref-ΔI。
S200, judges whether to meet U
pv(k)=U
pv(k-1), if met, step S210 is entered, otherwise, return step S170.
S210, preserves P
pv(k-1)=P
pv(k), U
pv(k-1)=U
pv(k).
Put it briefly, above-mentioned maximum power point tracking strategy judges perturbation direction by power output in former and later two control cycles, on this basis again according to the photovoltaic voltage amplitude of two control cycles change rapidly subregion to determine the size of air conditioner load, and then the reference current I of adjustment DC/DC converter
refrealize maximum power output.Especially, time identical for the photovoltaic voltage amplitude of former and later two control cycles, increase the closed-loop control that this judgement can realize the fast and stable that MPPT follows the tracks of, narrowed power stage point at maximum power point P
maxsearch Area, minimizing system adopts conventional disturbance observation at P
maxthe concussion of some left and right, improves photoelectric transformation efficiency and the stability of a system.
It should be noted that, in the description of this description, describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this description, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only storage (ROM), erasablely edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk read-only storage (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. a PV air-conditioner system, is characterized in that, comprising:
Air conditioner load, photovoltaic battery array and energy storage device;
DC/DC converter, described DC/DC converter is used for the direct current be converted to by the direct current that described photovoltaic battery array exports needed for described air conditioner load work;
Maximum power point tracking device, the photovoltaic voltage U that described maximum power point tracking device exports according to photovoltaic battery array described in current control period
pv(k) and photovoltaic electric current I
pvk () calculates current control period power output P
pv(k), and according to the photovoltaic voltage U of a upper control cycle
pvand photovoltaic electric current I (k-1)
pv(k-1) the power output P of a upper control cycle is obtained
pv(k-1), and according to P
pv(k), P
pv(k-1), U
pv(k) and U
pv(k-1) reference current of next control cycle of disturbance is to regulate the power output of described DC/DC converter, is operated in maximum power point to make described photovoltaic battery array;
Control device, the discharge and recharge of described control device energy storage device according to the output power of described DC/DC converter and the power supply of described air conditioner load is controlled.
2. PV air-conditioner system as claimed in claim 1, it is characterized in that, described maximum power point tracking device comprises PPT controller and a PWM device, and wherein, described MPPT controller is used for carrying out following process:
Meeting P
pv(k) > P
pv(k-1), time, judge whether further to meet U
pv(k) > U
pv(k-1), if met, then export and reduce reference current signal to regulate dutycycle to reduce the power output of described DC/DC converter by a described PWM device, if do not met, then export and increase reference current signal to regulate dutycycle to increase the power output of described DC/DC converter by a described PWM device.
3. PV air-conditioner system as claimed in claim 2, it is characterized in that, described MPPT controller is also for carrying out following process:
Do not meeting P
pv(k) > P
pv(k-1), time, judge whether to meet P
pv(k) < P
pv(k-1), if meet P
pv(k) < P
pv(k-1), judge whether further to meet U
pv(k) > U
pv(k-1), if met, then export and increase reference current signal to regulate dutycycle to increase the power output of described DC/DC converter by a described PWM device, if do not met, then export and reduce reference current signal to regulate dutycycle to reduce the power output of described DC/DC converter by a described PWM device.
4. PV air-conditioner system as claimed in claim 3, it is characterized in that, described MPPT controller is also for carrying out following process:
Do not meeting P
pv(k) > P
pvand do not meet P (k-1)
pv(k) < P
pv(k-1), time, judge whether further to meet U
pv(k)=U
pv(k-1), if meet U
pv(k)=U
pv(k-1), then current described reference current is maintained.
5. PV air-conditioner system as claimed in claim 1, is characterized in that, also comprise:
Follow the trail of adjusting device, described tracking adjusting device is used for carrying out attitude regulation to described photovoltaic battery array, and described tracking adjusting device comprises:
Light sensor, for present orientation angle and the present level angle of the trace detection sun;
Timer;
Controller, described controller obtains the current time data of described timer, and true bearing angle and the actual height angle of corresponding described photovoltaic battery array is obtained according to described current time data, export according to the present orientation angle of the described sun and the true bearing angle of described photovoltaic battery array and turn to conditioning signal, and export pitch regulation signal according to the present level angle of the described sun and the actual height angle of described photovoltaic battery array;
First drive motors and turn to governor motion, described first drive motors according to described in turn to conditioning signal pass through described in turn to the between east and west parallactic angle of governor motion to described photovoltaic battery array to regulate; With
Second drive motors and pitching adjusting mechanism, described second drive motors is regulated by the elevation angle of described pitching adjusting mechanism to described photovoltaic battery array according to described pitch regulation signal.
6. PV air-conditioner system as claimed in claim 1, is characterized in that, also comprise:
Inverter circuit, the DC side of described inverter circuit is connected with described DC/DC converter, and the AC of described inverter circuit is connected with electrical network with described air conditioner load respectively, for direct current being converted to the alternating current needed for described air conditioner load work;
Inverter drive, described inverter drive drives described inverter circuit according to control signal;
Grid-connected sychronisation, described grid-connected sychronisation comprises:
Current sensor, the current value of the alternating current that the AC for detecting described inverter circuit exports;
Synchronizing indicator, for detecting the synchronizing signal of described electrical network;
Pi regulator, described pi regulator obtains the DC voltage of the DC side of described inverter circuit and the synchronizing signal of described electrical network, and carries out PI adjustment to described DC voltage, the signal after being regulated by PI and described synchronizing signal computing, and exports operation result;
2nd PWM device, the current value that described 2nd PWM device detects according to described current sensor and described operation result generate pwm control signal, and described pwm control signal is transferred to described inverter drive.
7. the control method of a PV air-conditioner system, it is characterized in that, described PV air-conditioner system comprises air conditioner load, photovoltaic battery array, energy storage device, DC/DC converter, maximum power point tracking device and control device, and described control method comprises the following steps:
The photovoltaic voltage U that described maximum power point tracking device exports according to photovoltaic battery array described in current control period
pv(k) and photovoltaic electric current I
pvk () calculates kth control cycle power output P
pv(k), and according to the photovoltaic voltage U of a upper control cycle
pvand photovoltaic electric current I (k-1)
pv(k-1) the power output P of a upper control cycle is obtained
pv(k-1), and according to P
pv(k), P
pv(k-1), U
pv(k) and U
pv(k-1) reference current of next control cycle of disturbance is to regulate the power output of described DC/DC converter, is operated in maximum power point to make described photovoltaic battery array; And
The discharge and recharge of described control device energy storage device according to the output power of described DC/DC converter and the power supply of described air conditioner load is controlled.
8. the control method of PV air-conditioner system as claimed in claim 7, it is characterized in that, described maximum power point tracking device comprises MPPT controller and a PWM device, according to P
pv(k), P
pv(k-1), U
pv(k) and U
pv(k-1) reference current of next control cycle of disturbance is to regulate the power output of described DC/DC converter, specifically comprises:
Described MPPT controller judges whether to meet P
pv(k) > P
pv(k-1);
If meet P
pv(k) > P
pv(k-1), described MPPT controller judges whether to meet U further
pv(k) > U
pv(k-1);
If meet P
pv(k) > P
pv(k-1), then described MPPT controller exports reduction reference current signal to regulate dutycycle to reduce the power output of described DC/DC converter by a described PWM device; And
If do not meet P
pv(k) > P
pv(k-1), then described MPPT controller exports increase reference current signal to regulate dutycycle to increase the power output of described DC/DC converter by a described PWM device.
9. the control method of PV air-conditioner system as claimed in claim 8, is characterized in that, also comprise:
If do not meet P
pv(k) > P
pv(k-1), then described MPPT controller judges whether to meet P further
pv(k) < P
pv(k-1);
If meet P
pv(k) < P
pv(k-1), described MPPT controller judges whether to meet U further
pv(k) > U
pv(k-1);
If meet U
pv(k) > U
pv(k-1), then described MPPT controller exports increase reference current signal to regulate dutycycle to increase the power output of described DC/DC converter by a described PWM device; And
If do not meet U
pv(k) > U
pv(k-1), then described MPPT controller exports reduction reference current signal to regulate dutycycle to reduce the power output of described DC/DC converter by a described PWM device.
10. the control method of PV air-conditioner system as claimed in claim 9, is characterized in that, also comprise:
If do not meet P
pv(k) > P
pvand do not meet P (k-1)
pv(k) < P
pv(k-1), described MPPT controller judges whether to meet U further
pv(k)=U
pv(k-1), if meet U
pv(k)=U
pv(k-1), then current described reference current is maintained.
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| CN107370178A (en) * | 2017-07-25 | 2017-11-21 | 合肥工业大学 | Photovoltaic combining inverter maximum power tracking and controlling method with droop characteristic |
| CN107370178B (en) * | 2017-07-25 | 2019-12-20 | 合肥工业大学 | Photovoltaic grid-connected inverter maximum power tracking control method with inverted droop characteristic |
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| CN107860967A (en) * | 2017-12-08 | 2018-03-30 | 珠海格力电器股份有限公司 | And the detection means and method of off-network PV air-conditioner conversion efficiency |
| CN113422424A (en) * | 2021-08-25 | 2021-09-21 | 绵阳天仪空间科技有限公司 | Satellite power supply system |
| CN113422424B (en) * | 2021-08-25 | 2021-11-30 | 绵阳天仪空间科技有限公司 | Satellite power supply system |
| CN116300657A (en) * | 2023-05-10 | 2023-06-23 | 江西莎妮智能科技有限公司 | Solar wireless monitoring control method and wireless monitoring control equipment |
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