CN204103796U - Photovoltaic DC-to-AC converter and PV air-conditioner system - Google Patents
Photovoltaic DC-to-AC converter and PV air-conditioner system Download PDFInfo
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- CN204103796U CN204103796U CN201420397463.1U CN201420397463U CN204103796U CN 204103796 U CN204103796 U CN 204103796U CN 201420397463 U CN201420397463 U CN 201420397463U CN 204103796 U CN204103796 U CN 204103796U
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Abstract
The utility model discloses a kind of photovoltaic DC-to-AC converter and PV air-conditioner system, wherein photovoltaic DC-to-AC converter comprises inverter circuit, and inverter circuit comprises IPM module, and IPM module is three-phase bridge circuit; Three-phase bridge circuit comprises the device for power switching with anti-paralleled diode; Device for power switching forms upper arm and underarm, and upper arm and underarm are a phase brachium pontis; The parallel connection of three-phase brachium pontis forms three-phase bridge circuit; Three-phase bridge circuit can connect three phase mains or single phase poaer supply; When three-phase bridge circuit connects three phase mains, each upper arm of phase brachium pontis of three phase mains access three-phase bridge circuit and the junction of underarm; When three-phase bridge circuit connects single phase poaer supply, any upper arm of two-phase brachium pontis and the junction of underarm in the three-phase brachium pontis of single phase poaer supply access three-phase bridge circuit.Its by three-phase brachium pontis formed three-phase bridge circuit, efficiently solve existing PV air-conditioner systematic influence its to the problem of the applicability of national grid.
Description
Technical field
The utility model relates to household appliance technical field, particularly relates to a kind of photovoltaic DC-to-AC converter and PV air-conditioner system.
Background technology
Existing PV air-conditioner unit, usually adopts solar cell and national grid mixed power supply system, comprises solar battery array, BOOST1 booster circuit, rectifier bridge and two-way current conversion circuit.The direct current that solar battery array exports, after the boosting of BOOST1 booster circuit, is inputted in the inverter of air-conditioner set by DC bus, after direct current is converted to alternating current by the inverter of air-conditioner set, drive air-conditioner set to run.Meanwhile, the alternating current that national grid exports inputs in the inverter of air-conditioner set after rectifier bridge and two-way current conversion circuit, runs through inverter rear drive air-conditioner set.
Adopt the PV air-conditioner unit of above-mentioned mixed power supply system, when the power output of solar battery array is less than the operate power of air-conditioner set, the stable operation ensureing air-conditioner set is powered to air-conditioner set by national grid simultaneously.When the power output of solar battery array is greater than the operate power of air-conditioner set, the surplus power exported due to solar battery array does not have other approach to discharge, the dc-link capacitance of the inverter in air-conditioner set will be caused more and more higher, finally cause inverter to damage, affect the normal operation of air-conditioner set.And the operate power of air-conditioner set is equaled by the power output controlling solar battery array, although can ensure that air-conditioner set normally runs, but the power output that can affect solar battery array can not be peak power output, makes solar battery array utilance not reach optimum.
Therefore, on above-mentioned mixed power supply system, storage battery can be added.When the power output of solar battery array is greater than the operate power of air-conditioner set, the surplus power exported by controlling solar battery array inputs in storage battery.When the power output of solar battery array is not enough to drive air-conditioner set normally to run, by storage battery, air-conditioner set is powered.
But, in above-mentioned two kinds of PV air-conditioner systems, the alternating current (i.e. the electricity of national grid output) of employing is single-phase electricity, when power supply is three phase mains, existing PV air-conditioner system is then inapplicable, thus have impact on the applicability of PV air-conditioner system to national grid.
Utility model content
Based on this, be necessary for existing PV air-conditioner systematic influence its to the problem of the applicability of national grid, a kind of photovoltaic DC-to-AC converter and PV air-conditioner system are provided.
For realizing a kind of photovoltaic DC-to-AC converter that the utility model object provides, comprise inverter circuit, described inverter circuit comprises IPM module, and described IPM module is three-phase bridge circuit;
Described three-phase bridge circuit comprises the device for power switching with anti-paralleled diode;
Described device for power switching forms upper arm and underarm, and described upper arm and described underarm are a phase brachium pontis;
The parallel connection of three-phase brachium pontis forms described three-phase bridge circuit;
Described three-phase bridge circuit can connect three phase mains or single phase poaer supply;
When described three-phase bridge circuit connects described three phase mains, described three phase mains accesses the described upper arm of each phase brachium pontis and the junction of described underarm of described three-phase bridge circuit;
When described three-phase bridge circuit connects described single phase poaer supply, described single phase poaer supply accesses any described upper arm of two-phase brachium pontis and the junction of described underarm in the three-phase brachium pontis of described three-phase bridge circuit.
Wherein in an embodiment, the described upper arm of the described two-phase brachium pontis be connected with described single phase poaer supply in described three-phase bridge circuit is without bridge construction.
Wherein in an embodiment, described inverter circuit also comprises phase current sampling circuit, line voltage sampling circuit, busbar voltage sample circuit and dsp controller;
The output of described phase current sampling circuit, the output of described line voltage sampling circuit is all connected with the input of described dsp controller with the output of described busbar voltage sample circuit, for the phase current that the described single phase poaer supply that gathered by described phase current sampling circuit or described three phase mains export, the DC bus-bar voltage that the solar battery array of the phase voltage that the described single phase poaer supply of described line voltage sampling circuit collection or described three phase mains export and the collection of described busbar voltage sample circuit exports inputs to described dsp controller;
Described dsp controller, according to the described phase current that described single phase poaer supply or described three phase mains export, the described phase voltage that described single phase poaer supply or described three phase mains export and the described DC bus-bar voltage that described solar battery array exports, to described IPM module input pulse width modulation signal, control described device for power switching and be turned on or off.
Wherein in an embodiment, described inverter circuit also comprises the first reactor, the second reactor and the 3rd reactor;
The first-phase of described three phase mains accesses the upper arm of first-phase brachium pontis and the junction of underarm of described three-phase bridge circuit through the first reactor;
The second-phase of described three phase mains accesses the upper arm of second-phase brachium pontis and the junction of underarm of described three-phase bridge circuit through the second reactor;
The third phase of described three phase mains accesses the upper arm of third phase brachium pontis and the junction of underarm of described three-phase bridge circuit through the 3rd reactor.
Wherein in an embodiment, described inverter circuit also comprises capacitance group and grading resistor, and described capacitance group is in parallel with described grading resistor;
The junction of the described upper arm of three-phase brachium pontis described in described three-phase bridge circuit is accessed in one end after described capacitance group is in parallel with described grading resistor, and the other end accesses the junction of the described underarm of three-phase brachium pontis described in described three-phase bridge circuit.
Wherein in an embodiment, also comprise booster circuit, the input of described booster circuit is electrically connected with the output of described solar battery array;
The output of described booster circuit, by DC bus, is electrically connected with the output of described inverter circuit.
Wherein in an embodiment, described booster circuit comprises the first control unit circuit, the first device for power switching, the first inductance, the first diode and the 3rd electric capacity;
The output of described first control unit circuit is connected with the input of described first device for power switching, for inputting the first pulse width modulating signal to described first device for power switching, controls conducting and the disconnection of described first device for power switching;
First output of described first device for power switching is electrically connected with the output of described solar battery array, and the second output of described first device for power switching is electrically connected with one end of described first inductance;
One end of described first diode is electrically connected with one end of described first inductance, and the other end of described first diode is connected with one end of described 3rd electric capacity;
The other end of described 3rd electric capacity is electrically connected with the other end of described first inductance.
Wherein in an embodiment, described booster circuit comprises the second control unit, the second device for power switching, the second inductance, the second diode and the 4th electric capacity;
The output of described second control unit is connected with the input of described second device for power switching, for inputting the second pulse width modulating signal to described second device for power switching, controls conducting and the disconnection of described second device for power switching;
First output of described second device for power switching is electrically connected with one end of described second inductance;
Second output of described second device for power switching, is connected by the other end of described solar battery array with described second inductance;
One end of described second diode is electrically connected with the second output of described second device for power switching, and the other end of described second diode is electrically connected with one end of described 4th electric capacity;
The other end of described 4th electric capacity is electrically connected with the second output of described second device for power switching.
Wherein in an embodiment, described booster circuit comprises the 3rd control unit, the 3rd device for power switching, the 4th device for power switching, the 3rd inductance, the 4th inductance, the 3rd diode, the 4th diode and the 5th electric capacity;
First output, second output of described 3rd control unit are connected with the input of described 3rd device for power switching and the input of described 4th device for power switching respectively;
First output of described 3rd device for power switching is electrically connected with one end of described 3rd inductance, the second output of described 3rd device for power switching, is electrically connected by the other end of described solar battery array with described 3rd inductance;
First output of described 4th device for power switching is electrically connected with one end of described 4th inductance, the second output of described 4th device for power switching, is electrically connected by the other end of described solar battery array with described 4th inductance;
One end of described 3rd diode is electrically connected with one end of described 3rd inductance, and the other end of described 3rd diode is electrically connected with one end of described 5th electric capacity;
One end of described 4th diode is electrically connected with one end of described 4th inductance, and the other end of described 4th diode is electrically connected with one end of described 5th electric capacity;
The other end of described 5th electric capacity is electrically connected with the second output of described 4th device for power switching.
Accordingly, the utility model additionally provides a kind of PV air-conditioner system, comprises any one photovoltaic DC-to-AC converter above-mentioned.
The beneficial effect of above-mentioned photovoltaic DC-to-AC converter and PV air-conditioner system: it by arranging the photovoltaic DC-to-AC converter with inverter circuit in PV air-conditioner system, and this inverter circuit comprises the IPM module of three-phase bridge circuit.Its three-phase bridge circuit is become by the set of power switches with anti-paralleled diode.The device for power switching with anti-paralleled diode forms upper arm and the underarm of three-phase bridge circuit, and upper arm and underarm are a phase brachium pontis.Form three-phase bridge circuit by the above-mentioned brachium pontis of three-phase, thus make the three-phase of the three phase mains corresponding upper arm of three-phase brachium pontis and the junction of underarm accessing three-phase bridge circuit respectively, realize the connection of three phase mains and photovoltaic DC-to-AC converter.PV air-conditioner system is made to be applicable to three phase mains.
And, when PV air-conditioner system needs to use single phase poaer supply, only need control any upper arm of two-phase brachium pontis in the three-phase brachium pontis of three-phase bridge circuit to be connected with single phase poaer supply with the junction of underarm, the connection of single phase poaer supply and photovoltaic DC-to-AC converter can be realized, and then realize the connection of PV air-conditioner system and single phase poaer supply.It, by controlling the connected mode of the IPM module of the inverter circuit in photovoltaic DC-to-AC converter, can make PV air-conditioner system be applicable to three phase mains and single phase poaer supply simultaneously, improve the adaptability of PV air-conditioner system.Efficiently solve existing PV air-conditioner systematic influence its to the problem of the applicability of national grid.
Accompanying drawing explanation
One specific embodiment topological diagram when Fig. 1 is inverter circuit connection three phase mains in photovoltaic DC-to-AC converter;
One specific embodiment topological diagram when Fig. 2 is inverter circuit connection single phase poaer supply in photovoltaic DC-to-AC converter;
Another specific embodiment topological diagram when Fig. 3 is inverter circuit connection single phase poaer supply in photovoltaic DC-to-AC converter;
Commutation inversion two-way circuit figure when Fig. 4 is inverter circuit connection three phase mains in photovoltaic DC-to-AC converter;
Fig. 5 is that in photovoltaic DC-to-AC converter, inverter circuit connects three phase mains, and when working in full-controlled rectifier pattern, R phase carries out double-closed-loop control software block diagram;
Fig. 6 is that in photovoltaic DC-to-AC converter, inverter circuit connects three phase mains, and when working in full-controlled rectifier pattern, three-phase independently carries out double-closed-loop control software block diagram;
Fig. 7 is that in photovoltaic DC-to-AC converter, inverter circuit connects three phase mains, and when working in parallel network reverse pattern, R phase carries out double-closed-loop control software block diagram;
Fig. 8 is that in photovoltaic DC-to-AC converter, inverter circuit connection single phase poaer supply carries out double-closed-loop control software block diagram;
Fig. 9 is a specific embodiment structural representation of the PV air-conditioner system adopting photovoltaic DC-to-AC converter;
Figure 10 is booster circuit one specific embodiment circuit diagram in photovoltaic DC-to-AC converter;
Figure 11 is another specific embodiment circuit diagram of booster circuit in photovoltaic DC-to-AC converter;
Figure 12 is the another specific embodiment circuit diagram of booster circuit in photovoltaic DC-to-AC converter.
Embodiment
For making technical solutions of the utility model clearly, below in conjunction with drawings and the specific embodiments, the utility model is described in further details.
It should be noted that, when relating to the first-phase of three phase mains, second-phase and third phase in following examples, be all R phase with first-phase, second-phase is S-phase, and third phase is T-phase is that example is described.
As the photovoltaic DC-to-AC converter of a specific embodiment, comprise inverter circuit, inverter circuit comprises IPM module, and IPM module is three-phase bridge circuit.Three-phase bridge circuit comprises the device for power switching with anti-paralleled diode.Device for power switching forms upper arm and underarm, and upper arm and underarm are a phase brachium pontis.The parallel connection of three-phase brachium pontis forms three-phase bridge circuit.
Three-phase bridge circuit can connect three phase mains or single phase poaer supply.When three-phase bridge circuit connects three phase mains, each upper arm of phase brachium pontis of three phase mains access three-phase bridge circuit and the junction of underarm.
When three-phase bridge circuit connects single phase poaer supply, any upper arm of two-phase brachium pontis and the junction of underarm in the three-phase brachium pontis of single phase poaer supply access three-phase bridge circuit.
It by arranging the photovoltaic DC-to-AC converter with inverter circuit in PV air-conditioner system, and this inverter circuit comprises the IPM module of three-phase bridge circuit.Its three-phase bridge circuit is become by the set of power switches with anti-paralleled diode.The device for power switching with anti-paralleled diode forms upper arm and the underarm of three-phase bridge circuit, and upper arm and underarm are a phase brachium pontis.Form three-phase bridge circuit by the above-mentioned brachium pontis of three-phase, thus make the three-phase of three phase mains access the upper arm of three-phase brachium pontis and the junction of underarm of three-phase bridge circuit respectively, realize the connection of three phase mains and photovoltaic DC-to-AC converter.PV air-conditioner system is made to be applicable to three phase mains.
And, when PV air-conditioner system needs to use single phase poaer supply, only need control any upper arm of two-phase brachium pontis in the three-phase brachium pontis of three-phase bridge circuit to be connected with single phase poaer supply with the junction of underarm, the connection of single phase poaer supply and photovoltaic DC-to-AC converter can be realized, and then realize the connection of PV air-conditioner system and single phase poaer supply.It, by controlling the connected mode of the IPM module of the inverter circuit in photovoltaic DC-to-AC converter, can make PV air-conditioner system be applicable to three phase mains and single phase poaer supply simultaneously, improve the adaptability of PV air-conditioner system.Efficiently solve existing PV air-conditioner systematic influence its to the problem of the applicability of national grid.
Wherein, device for power switching can be IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), the compound full-control type voltage driven type power semiconductor that it is made up of BJT (double pole triode) and MOS (insulating gate type field effect tube), has the advantage of the high input impedance of MOSFET and low conduction voltage drop two aspect of GTR concurrently.
Concrete, when AC power is three phase mains, see Fig. 1, device for power switching Q1 and anti-paralleled diode D1 forms the first upper arm of three-phase bridge circuit.Device for power switching Q2 and anti-paralleled diode D2 forms the first underarm of three-phase bridge circuit.First upper arm and the first underarm are connected in series the first-phase brachium pontis forming three-phase bridge circuit.
Device for power switching Q3 and anti-paralleled diode D3 forms the second upper arm of three-phase bridge circuit.Device for power switching Q4 and anti-paralleled diode D4 forms the second underarm of three-phase bridge circuit.Second upper arm and the second underarm are connected in series the second-phase brachium pontis forming three-phase bridge circuit.
Device for power switching Q5 and anti-paralleled diode D5 forms the 3rd upper arm of three-phase bridge circuit.Device for power switching Q6 and anti-paralleled diode D6 forms the 3rd underarm of three-phase bridge circuit.3rd upper arm and the 3rd underarm are connected in series the third phase brachium pontis forming three-phase bridge circuit.
Above-mentioned three-phase brachium pontis (first-phase brachium pontis, second-phase brachium pontis and third phase brachium pontis) parallel connection forms three-phase bridge circuit.
When AC power is three phase mains, the first-phase R phase of three phase mains is by the first reactor L
raccess the junction Ua of the first upper arm and the first underarm.The second-phase S-phase of three phase mains is by the second reactor L
saccess the junction Ub of the second upper arm and the second underarm.The third phase T-phase of three phase mains is by the 3rd reactor L
taccess the junction Uc of the 3rd upper arm and the 3rd underarm.Thus realize the connection of photovoltaic DC-to-AC converter and three phase mains.
Meanwhile, the DC side parallel of three-phase bridge circuit has capacitance group C, and this capacitance group C is used for filtering.
When photovoltaic DC-to-AC converter works in inversion grid connection pattern, this capacitance group C carries out filtering to the direct current that solar battery array exports.
When photovoltaic DC-to-AC converter works in full-controlled rectifier pattern, this capacitance group C carries out filtering to the direct current after photovoltaic DC-to-AC converter inversion.
Further, the DC side of three-phase bridge circuit is parallel with grading resistor simultaneously, and this grading resistor can be made up of two resistance be connected in series, and see Fig. 1, this grading resistor can be R13 and R14 be connected in series.
Its concrete connected mode is: the junction of the upper arm of three-phase brachium pontis (first-phase brachium pontis, second-phase brachium pontis and third phase brachium pontis) in one end access three-phase bridge circuit after capacitance group C is in parallel with grading resistor, the junction of the underarm of three-phase brachium pontis in other end access three-phase bridge circuit.Wherein, capacitance group C and grading resistor are similarly and are connected in parallel.
Meanwhile, inverter circuit also comprises phase current sampling circuit, line voltage sampling circuit, busbar voltage sample circuit and dsp controller.
The output of phase current sampling circuit, the output of line voltage sampling circuit is all connected with the input of dsp controller with the output of busbar voltage sample circuit, for the phase current that the AC power gathered by phase current sampling circuit exports, the DC bus-bar voltage that the phase voltage of AC power output of line voltage sampling circuit collection and the solar battery array of busbar voltage sample circuit collection export inputs to dsp controller.
Dsp controller, according to the phase current that AC power exports, the phase voltage that AC power exports and the DC bus-bar voltage that solar battery array exports, to IPM module input pulse width modulation signal, control device for power switching and be turned on or off.
Concrete, see Fig. 1, phase current sampling circuit comprises first-phase (R phase) phase current (I be made up of the first current sensor, the 9th resistance R9, the tenth resistance R10 and operational amplifier OP3
r) sample circuit, and second-phase (S-phase) phase current (I be made up of the second current sensor, the 11 resistance R11, the 12 resistance R12 and operational amplifier OP4
s) sample circuit.
Line voltage sampling circuit comprises by the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, and operational amplifier OP1, operational amplifier OP2 and reference voltage V
rEFthe line voltage V of composition
rSwith line voltage V
tRsample circuit.
Busbar voltage sample circuit then can be made up of grading resistor R13 and R14.
Through the first-phase phase current I of the AC power output that phase current sampling circuit gathers
rwith second-phase phase current I
sanalog quantity, line voltage sampling circuit gather AC power export first-phase and second-phase between phase voltage V
rSand the phase voltage V between third phase and first-phase
tRanalog quantity, and busbar voltage sample circuit gather solar battery array export DC bus-bar voltage (the i.e. DC bus-bar voltage V of the DC side of photovoltaic DC-to-AC converter
dC) analog quantity all input to dsp controller by the input of dsp controller.
Dsp controller carries out three-phase PFC control method calculation process according to above-mentioned analog quantity, according to SPWM rule output pulse width modulation (Pulse Width Modulation, PWM) signal PWM1-PWM6.Pulse width modulating signal PWM1-PWM6 controls being turned on or off of device for power switching Q1, device for power switching Q2, device for power switching Q3, device for power switching Q4, device for power switching Q5 and device for power switching Q6 respectively, the phase current of the R phase that three phase mains is exported, S-phase, T-phase according to certain rule through the first reactor L
r, the second reactor L
s, the 3rd reactor L
t, and Q1-Q6 in the device for power switching of conducting and fly-wheel diode (D1-D6) and capacitance group C.At the first reactor L
r, the second reactor L
s, and the 3rd reactor L
tinterior storage power and releasing energy, thus make the current phase of R phase, S-phase and T-phase three-phase follow corresponding voltage-phase in real time, to reach the object improving power factor.Also improve simultaneously and stabilize DC bus-bar voltage V
dCthe numerical value of specifying.
What deserves to be explained is, dsp controller, through the control method calculation process of three-phase PFC, is finally respectively by the duty ratio of the PWM1-PWM6 of SPWM rule output
x=R, S, T).
When AC power is single phase poaer supply, then by suitable software control, select any two-phase brachium pontis in three-phase brachium pontis as single-phase main topological circuit, the photovoltaic DC-to-AC converter main circuit of single phase poaer supply can be realized.Namely by changing the connected mode of each device for power switching and AC power in three-phase bridge circuit, single phase poaer supply is accessed any upper arm of two-phase brachium pontis and the junction of underarm in the three-phase brachium pontis of three-phase bridge circuit, the connection of single phase poaer supply and photovoltaic DC-to-AC converter can be realized.
Its control procedure is as follows: select Q1 and Q2, Q3 and Q4, in Q5 and Q6 tri-groups any two groups as single-phase main topological circuit.As: select Q1 and Q2, Q3 and Q4 two groups, phase voltage sample circuit, phase current sampling circuit, the first reactor, the second reactor and the 3rd reactor also corresponding selection two-way, only need pulse-width signal PWM1-PWM4 to work simultaneously.Concrete:
See Fig. 2, to select Q1 and Q2, Q3 and Q4 two groups is example.Wherein, device for power switching Q1 and anti-paralleled diode D1 forms the first upper arm of three-phase bridge circuit.Device for power switching Q2 and anti-paralleled diode D2 forms the first underarm of three-phase bridge circuit.First upper arm and the first underarm are connected in series the first-phase brachium pontis forming three-phase bridge circuit.
Device for power switching Q3 and anti-paralleled diode D3 forms the second upper arm of three-phase bridge circuit.Device for power switching Q4 and anti-paralleled diode D4 forms the second underarm of three-phase bridge circuit.Second upper arm and the second underarm are connected in series the second-phase brachium pontis forming three-phase bridge circuit.
The upper arm of first-phase brachium pontis and the junction first reactor L of underarm
rbe connected with single phase poaer supply.The upper arm of second-phase brachium pontis and the junction second reactor L of underarm
sbe connected with single phase poaer supply.
Meanwhile, the capacitance group C being connected in parallel on three-phase bridge circuit DC side can be composed in series by the first electric capacity C1 and the second electric capacity C2.
Accordingly, phase current sampling circuit, line voltage sampling circuit and busbar voltage sample circuit can select corresponding two-way according to the device for power switching selected, dsp controller is made to carry out three-phase PFC control method calculation process according to the analog quantity that phase current sampling circuit, line voltage sampling circuit and busbar voltage sample circuit gather respectively, according to SPWM rule output pulse width modulation signal PWM1-PWM4.Pulse width modulating signal PWM1-PWM4 controls device for power switching Q1, device for power switching Q2, device for power switching Q3, being turned on or off of device for power switching Q4 respectively.
In like manner, also can select Q1 and Q2, Q5 and Q6 two groups, or Q3 and Q4, Q5 and Q6 two groups.
See Fig. 3, in order to optimize the radiating effect of photovoltaic DC-to-AC converter further, when realizing single-phase rectifier PFC function, inverter circuit also can adopt without bridge construction.The upper arm of the two-phase brachium pontis be namely connected with single phase poaer supply in three-phase bridge circuit is without bridge construction.
Because the upper arm of the two-phase brachium pontis be connected with single phase poaer supply is without bridge construction, thus decrease the work of two device for power switching of upper arm, make the energy of consumption less, the heat of generation is less.And improve the efficiency of photovoltaic DC-to-AC converter.
According to the power output of solar battery array, the software work of photovoltaic DC-to-AC converter can be divided into rectification and grid-connected two states.The current transforming unit that the grid-connected module of commutation inversion in photovoltaic DC-to-AC converter (i.e. inverter circuit) is energy capable of bidirectional flowing.Main realization, to the control of electrical network (AC power), namely realizes full-controlled rectifier when the power output of solar battery array is not enough, supplies needed for air-conditioner set consumed energy from electrical network power taking.When the power output of solar battery array is sufficient, excess energy inversion telegram in reply net, realize grid-connected object.
See Fig. 4, for three phase mains access photovoltaic DC-to-AC converter, when photovoltaic DC-to-AC converter works in full-controlled rectifier pattern, inverter circuit works in full-controlled rectifier pattern equally.Now, energy flows into photovoltaic DC-to-AC converter by electrical network (what now, electrical network exported is three-phase electricity).Its circuit structure is the booster circuit on three tunnels, and operation principle is: for R phase, when device for power switching Q2 conducting, electric current from R phase through the first reactor L
r, flow into device for power switching Q2, flow through diode D4 or diode D6, arrive S-phase or T-phase and the second reactor L
sor the 3rd reactor L
t.In device for power switching Q2 conduction period, the first reactor L
relectric current rise, storage power; When device for power switching Q2 turns off, be stored in the first reactor L
renergy flow into capacitance group (i.e. C1 and C2) on inverter DC bus through diode D1, thus realize energy and flow into photovoltaic DC-to-AC converter by electrical network.
Under full-controlled rectifier pattern, must the waveform phase of three-phase phase current Ix (x=R, S, T) be regulated in real time to follow the waveform phase of phase voltage Vx (x=R, S, T), thus improve power factor, reduce harmonic components and content.When photovoltaic DC-to-AC converter is connected with three phase mains, can realize independently outer voltage, the double closed-loop PID of current inner loop regulates.Namely carry out independent control to R phase, S-phase and T-phase respectively, when it not only solves input voltage imbalance, photovoltaic DC-to-AC converter is to the applicability problem of electrical network.Meanwhile, be also applicable to software function when photovoltaic DC-to-AC converter is connected with single phase poaer supply, improve the versatility of software and hardware, also substantially increase the reliability of photovoltaic DC-to-AC converter, strengthen photovoltaic DC-to-AC converter to the fault-tolerant ability of hardware.
See Fig. 5, its control method adopts two close cycles (outer voltage, current inner loop) to control.Be described for R phase.Outer shroud is Voltage loop, and major control inverter DC bus-bar voltage is fixed value V
dC_REF.Inner ring is electric current loop, the current reference value I of R phase
r_REFby outer voltage through PID control export value and power reference Pm and actual phase voltage Vx (x=R, S, T) obtain after multiplier M.Current reference value I
r_REFwith actual detected value I
rdifference carry out PID control, after converting, obtain the reference value V of each phase phase voltage after its Output rusults is added with actual phase voltage Vx (x=R, S, T)
pWM_X(x=R, S, T), then adopts SPWM modulator approach, by V
pWM_X(x=R, S, T) and triangular carrier are made comparisons, and produce the pwm signal controlling device for power switching and be turned on or off.
See Fig. 6, when carrying out double-closed-loop control to R phase, the pwm signal that the control device for power switching of generation is turned on or off is respectively: control the PWM1 signal of device for power switching Q1 and control the PWM2 signal of device for power switching Q2.
When carrying out double-closed-loop control to S-phase, the pwm signal that the control device for power switching of generation is turned on or off is: control the PWM3 signal of device for power switching Q3 and control the PWM4 signal of device for power switching Q4.
When carrying out double-closed-loop control to T-phase, the pwm signal that the control device for power switching of generation is turned on or off is: control the PWM5 signal of device for power switching Q5 and control the PWM6 signal of device for power switching Q6.
It should be noted that, for each phase, the pwm signal controlling upper arm device for power switching and the pwm signal controlling underarm device for power switching are complementary.Namely upper arm device for power switching and underarm device for power switching can not conductings simultaneously.
That is the PWM1 signal controlling device for power switching Q1 and the PWM2 signal controlling device for power switching Q2 are complementary signal, and device for power switching Q1 and device for power switching Q2 can not conducting simultaneously.The PWM3 signal controlling device for power switching Q3 and the PWM4 signal controlling device for power switching Q4 are similarly complementary signal, and device for power switching Q3 and device for power switching Q4 can not conducting simultaneously.The PWM5 signal controlling device for power switching Q5 and the PWM6 signal controlling device for power switching Q6 are similarly complementary signal, and device for power switching Q5 and device for power switching Q6 can not conducting simultaneously.
When photovoltaic DC-to-AC converter works in inversion grid connection pattern, inverter circuit works in inversion grid connection pattern equally.Now, energy flows into electrical network by photovoltaic DC-to-AC converter.Its operation principle is: because photovoltaic DC-to-AC converter is connected with line voltage, therefore, and the output voltage of photovoltaic DC-to-AC converter is determined by line voltage, therefore by the electric current of control inputs electrical network, reaches the object toward electrical network input power.Meanwhile, the current harmonic content of input electrical network must meet Standard, therefore the phase place of necessary detection of grid voltage simultaneously, reaches the requirement of the same homophase frequently with line voltage with the electric current guaranteeing to input electrical network.
See Fig. 7, under inversion grid connection pattern, adopt double-closed-loop control equally.Outer shroud is Voltage loop, and major control inverter DC bus-bar voltage is fixed value V
dC_REFand need higher than line voltage.Inner ring is electric current loop, its reference value I
r_REFby outer voltage and voltage phase-locked loop (Phase Locked Loop, PLL) given.By to current inner loop reference value I
r_REFwith actual detected value I
rdifference carry out PI control, obtain photovoltaic DC-to-AC converter every phase output voltage Ux (x=a, b, reference value c), adopt SPWM modulator approach, by Ux (x=a, b, c) and triangular carrier make comparisons, produced by SVPWM signal generator and control the pwm signal of device for power switching.Wherein, a, b, c corresponding R, S, T respectively.
In like manner, for each phase, the pwm signal controlling upper arm device for power switching and the pwm signal controlling underarm device for power switching are also complementary, and namely upper arm device for power switching and underarm device for power switching can not conductings simultaneously.PLL phase-locked loop, mainly for detection of each phase voltage phase place, reaches with line voltage with frequency homophase with the electric current reaching control inputs electrical network.
See Fig. 8, for carrying out the software control figure of double-closed-loop control when photovoltaic DC-to-AC converter connects single phase poaer supply.When photovoltaic DC-to-AC converter connects single phase poaer supply, equally according to the power output of solar battery array, the software work of photovoltaic DC-to-AC converter can be divided into rectification and grid-connected two states.
When photovoltaic DC-to-AC converter works in full-controlled rectifier pattern, two close cycles (outer voltage, current inner loop) is adopted to control.Outer shroud is Voltage loop, and major control inverter DC bus-bar voltage is fixed value V
dC_REF.Inner ring is electric current loop, the current reference value I of R phase
r_REFby outer voltage through PID I control export value and power reference Pm and actual phase voltage Vx (x=R, S, T) obtain after multiplier M.Current reference value I
r_REFwith actual detected value I
rdifference carry out PID II control, after converting, obtain the reference value V of each phase phase voltage after its Output rusults is added with actual phase voltage Vx (x=R, S, T)
pWM_X(x=R, S, T), then adopts SPWM modulator approach, by V
pWM_X(x=R, S, T) and triangular carrier are made comparisons, and produce the pwm signal controlling device for power switching.
See Fig. 9, when above-mentioned photovoltaic DC-to-AC converter is applied to PV air-conditioner system, connecting valve power supply on the DC bus of this system, direct voltage user interface, three-phase (single-phase) air-conditioning system etc.The Converting Unit (i.e. photovoltaic DC-to-AC converter) of three-phase and single phase poaer supply is different, but its mode of operation is identical.It is the mode of operation of the output power photovoltaic DC-to-AC converter according to solar battery array.Concrete:
Detected output voltage Vpv and the output current Ipv of solar battery array by dsp controller, calculate the maximum power Ppv that solar battery array exports.The maximum power Ppv that the solar battery array calculated is exported and air-conditioner set consumed power P
air-conditioningsubtract each other, draw the power of the grid-connected module of commutation inversion (inverter circuit), thus determine the mode of operation of the grid-connected module of commutation inversion (inverter circuit).
△ P is made to be the power of the grid-connected module of commutation inversion (inverter circuit), then △ P=Ppv-P
air-conditioning.
As △ P=0, the maximum power Ppv that solar battery array exports is all for air-conditioner set consumed power P
air-conditioning, the grid-connected module of commutation inversion is in holding state.
As △ P>0, the maximum power Ppv that solar battery array exports is greater than air-conditioner set consumed power P
air-conditioning, the grid-connected module work of commutation inversion is in inversion grid connection state.
As △ P<0, the maximum power Ppv that solar battery array exports is less than air-conditioner set consumed power P
air-conditioning, the grid-connected module work of commutation inversion is in full-controlled rectifier state.
As Ppv>0 and P
air-conditioningwhen=0, air-conditioner set is standby, and the grid-connected module work of commutation inversion is in inversion grid connection state.
As Ppv=0 and P
air-conditioningduring >0, air-conditioning consumed power all takes from electrical network, and the grid-connected module work of commutation inversion is in full-controlled rectifier state.
Adopt the PV air-conditioner control system of above-mentioned photovoltaic DC-to-AC converter to be applicable to three phase mains and single phase poaer supply simultaneously, not only can maximally utilise solar battery array generating, and when the power output of solar battery array is less than air-conditioner set consumed power, supply from electrical network (three phase mains or single phase poaer supply) energy lacked, namely run on mixed net PFC function.When the power output of solar battery array is greater than air-conditioner set consumed power, unnecessary energy inversion feedback grid can be used for miscellaneous equipment, namely run on grid-connected or from net function, not only realize the optimal utilization of solar battery array generating, and considerable economic well-being of workers and staff can be created.Meanwhile, also can be applicable to family expenses and the business air conditioner unit of the level power supplies such as different capacity (three phase mains or single phase poaer supply).
See Fig. 9, it should be noted that, photovoltaic DC-to-AC converter also comprises booster circuit.The input of booster circuit is electrically connected with the output of solar battery array.
The output of booster circuit, by DC bus, is electrically connected with the output of inverter circuit.
Booster circuit in photovoltaic DC-to-AC converter, namely DC-DC voltage conversion circuit is mainly by controlling the output voltage of solar battery array, realizes the maximum power point tracking (MPPT) of solar battery array.Thus the power output of real-time ensuring solar battery array is peak power output, effectively improves the utilance of solar battery array.
As the booster circuit of a specific embodiment, see Figure 10, be step-up/step-down circuit, i.e. BOOST/BUCK circuit.It comprises the first control unit (not shown), the first device for power switching Q7, the first inductance L 1, first diode D7 and the 3rd electric capacity C3.
The output of the first control unit is connected with the input of the first device for power switching Q7, for inputting the first pulse width modulating signal to the first device for power switching Q7, controls conducting and the disconnection of the first device for power switching Q7.
First output of the first device for power switching Q7 is electrically connected with the output of solar battery array, and second output of the first device for power switching Q7 is electrically connected with one end of the first inductance L 1.
One end of first diode D7 is electrically connected with one end of the first inductance L 1, and the other end of the first diode D7 is connected with one end of the 3rd electric capacity C3.The other end of the 3rd electric capacity C3 is electrically connected with the other end of the first inductance L 1.
Its operation principle is: when the first device for power switching Q7 conducting, and solar battery array makes its storing energy through Q7 to the first inductance L 1 power supply.Now electric current is i1, and direction as shown in Figure 10.Meanwhile, the 3rd electric capacity C3 maintains output voltage substantially constant.
When control first device for power switching Q7 disconnects, in the first inductance L 1, the energy of storage is to load R
loadrelease, electric current is i2, and direction as shown in Figure 10.Then the output voltage of booster circuit is:
Wherein, t
oncharacterize ON time, T characterizes switch periods.
If change conduction ratio α, then the output voltage V of the output voltage of booster circuit both comparable solar battery array
pVheight, also the output voltage V of comparable solar battery array
pVlow.As 0< α <0.5, the output voltage of booster circuit is less than the output voltage V of solar battery array
pV, be step-down.As 0.5< α <1, the output voltage of booster circuit is greater than the output voltage V of solar battery array
pV, be boosting.
By changing conduction ratio α, thus the output energy of solar battery array is forwarded on DC bus.Wherein the control signal PWM7 of the first device for power switching Q7 is produced by the first control unit.
Wherein, first control unit, by the direct current exported according to the solar battery array flowing through above-mentioned booster circuit, carries out outer voltage, and the two close cycles of current inner loop regulates, export variable control signal PWM7, thus regulate the solar battery array moment to operate in maximum power point MPPT.
As the booster circuit of a specific embodiment, widen the output voltage range 280V-1000V of solar battery array.When intensity of illumination is large, when the output voltage of solar battery array is greater than the DC bus-bar voltage of specifying, realize BUCK buck functionality.When intensity of illumination hour, when the output voltage of solar battery array is less than the DC bus-bar voltage of specifying, realize BOOST boost function.
As the booster circuit of another specific embodiment, see Figure 11, comprise the second control unit, the second device for power switching Q8, the second inductance L 2, second diode D8 and the 4th electric capacity C4.
The output of the second control unit is connected with the input of the second device for power switching Q8, for inputting the second pulse width modulating signal to the second device for power switching Q8, controls conducting and the disconnection of the second device for power switching Q8.
First output of the second device for power switching Q8 is electrically connected with one end of the second inductance L 2.
Second output of the second device for power switching Q8, is connected by the other end of solar battery array with the second inductance L 2.
One end of second diode D8 is electrically connected with second output of the second device for power switching Q8, and the other end of the second diode D8 is electrically connected with one end of the 4th electric capacity C4.
The other end of the 4th electric capacity C4 is electrically connected with second output of the second device for power switching Q8.
Booster circuit as another specific embodiment is the booster circuit of single channel.Its operation principle is: when the second device for power switching Q8 conducting, and the electric current flowing through the second inductance L 2 increases.Because inductance has the characteristic that electric current can not suddenly change, at the second device for power switching Q8 off period, the voltage that second inductance L 2 produces adds the output voltage of solar battery array, through the second diode D8, charging on the 4th electric capacity C4, thus the energy that solar battery array exports is forwarded on inverter DC bus.Wherein the control signal PWM8 of the second device for power switching Q8 is produced by the second control unit.
In like manner, the direct current of the second control unit by exporting according to the solar battery array of the booster circuit flowing through above-mentioned single channel, carry out outer voltage, the two close cycles of current inner loop regulates, export variable control signal PWM8, thus regulate the solar battery array moment to operate in maximum power point MPPT.
As the booster circuit of another specific embodiment, see Figure 12, comprise the 3rd control unit, the 3rd device for power switching Q9, the 4th device for power switching Q10, the 3rd inductance L 3, the 4th inductance L 4, the 3rd diode D9, the 4th diode D10 and the 5th electric capacity C5.
First output, second output of the 3rd control unit are connected with the input of the 3rd device for power switching Q9 and the input of the 4th device for power switching Q10 respectively.
First output of the 3rd device for power switching Q9 is electrically connected with one end of the 3rd inductance L 3, second output of the 3rd device for power switching Q9, is electrically connected by the other end of solar battery array with the 3rd inductance L 3.
First output of the 4th device for power switching Q10 is electrically connected with one end of the 4th inductance L 4, second output of the 4th device for power switching Q10, is electrically connected by the other end of solar battery array with the 4th inductance L 4.
One end of 3rd diode D9 is electrically connected with one end of the 3rd inductance L 3, and the other end of the 3rd diode D9 is electrically connected with one end of the 5th electric capacity C5.
One end of 4th diode D10 is electrically connected with one end of the 4th inductance L 4, and the other end of the 4th diode D10 is electrically connected with one end of the 5th electric capacity C5.
The other end of the 5th electric capacity C5 is electrically connected with second output of the 4th device for power switching Q10.
Booster circuit as another specific embodiment is two-way interleaved boost circuit, and the operation principle of two-way booster circuit is identical with the operation principle of the booster circuit of above-mentioned single channel, therefore repeats part and repeats no more.
It should be noted that, pulse width modulating signal PWM9 and PWM10 controlling the 3rd device for power switching Q9 and the 4th device for power switching Q10 is produced by the 3rd control unit.The difference of PWM9 and PWM10 is 180 °.Owing to being two-way Interleaved control, therefore, the rated capacity of the Primary Component in circuit as the 3rd inductance, the 4th inductance, the 3rd diode, the 4th diode, the 3rd device for power switching Q9 and the 4th device for power switching Q10 etc. is only required to be the half of the rated capacity of corresponding device in the booster circuit of single channel.
In like manner, 3rd control unit and the 4th control unit circuit are respectively by the direct current exported according to the solar battery array flowing through above-mentioned two-way interleaved boost circuit, carry out outer voltage, the two close cycles of current inner loop regulates, export variable pulse width modulating signal PWM9 and PWM10, thus regulate the solar battery array moment to operate in maximum power point MPPT.
Adopting the PV air-conditioner system of any one photovoltaic DC-to-AC converter above-mentioned, is three-phase bridge circuit by the inverter circuit arranged in photovoltaic DC-to-AC converter, achieves the object of the PV air-conditioner system that three phase mains and single phase poaer supply share.Efficiently solve existing PV air-conditioner system and be not suitable for three phase mains problem.
Meanwhile, by checking, adopt the PV air-conditioner system of any one photovoltaic DC-to-AC converter above-mentioned, promote 97% relative to the capacity usage ratio of traditional frequency conversion air-conditioning.And can generate electricity by way of merging two or more grid systems, thus improve power grid quality, power factor is 0.98, THDi (Total Harmonic Distortion of current on input, the Current harmonic distortion sum of input line) <5%.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. a photovoltaic DC-to-AC converter, is characterized in that, comprises inverter circuit; Described inverter circuit comprises IPM module, and described IPM module is three-phase bridge circuit;
Described three-phase bridge circuit comprises the device for power switching with anti-paralleled diode;
Described device for power switching forms upper arm and underarm, and described upper arm and described underarm are a phase brachium pontis;
The parallel connection of three-phase brachium pontis forms described three-phase bridge circuit;
Described three-phase bridge circuit can connect three phase mains or single phase poaer supply;
When described three-phase bridge circuit connects described three phase mains, described three phase mains accesses the described upper arm of each phase brachium pontis and the junction of described underarm of described three-phase bridge circuit;
When described three-phase bridge circuit connects described single phase poaer supply, described single phase poaer supply accesses any described upper arm of two-phase brachium pontis and the junction of described underarm in the three-phase brachium pontis of described three-phase bridge circuit.
2. photovoltaic DC-to-AC converter according to claim 1, is characterized in that, the described upper arm of the described two-phase brachium pontis be connected with described single phase poaer supply in described three-phase bridge circuit is without bridge construction.
3. photovoltaic DC-to-AC converter according to claim 1, is characterized in that, described inverter circuit also comprises phase current sampling circuit, line voltage sampling circuit, busbar voltage sample circuit and dsp controller;
The output of described phase current sampling circuit, the output of described line voltage sampling circuit is all connected with the input of described dsp controller with the output of described busbar voltage sample circuit, for the phase current that the described single phase poaer supply that gathered by described phase current sampling circuit or described three phase mains export, the DC bus-bar voltage that the solar battery array of the phase voltage that the described single phase poaer supply of described line voltage sampling circuit collection or described three phase mains export and the collection of described busbar voltage sample circuit exports inputs to described dsp controller;
Described dsp controller, according to the described phase current that described single phase poaer supply or described three phase mains export, the described phase voltage that described single phase poaer supply or described three phase mains export and the described DC bus-bar voltage that described solar battery array exports, to described IPM module input pulse width modulation signal, control described device for power switching and be turned on or off.
4. photovoltaic DC-to-AC converter according to claim 1, is characterized in that, described inverter circuit also comprises the first reactor, the second reactor and the 3rd reactor;
The first-phase of described three phase mains accesses the upper arm of first-phase brachium pontis and the junction of underarm of described three-phase bridge circuit through the first reactor;
The second-phase of described three phase mains accesses the upper arm of second-phase brachium pontis and the junction of underarm of described three-phase bridge circuit through the second reactor;
The third phase of described three phase mains accesses the upper arm of third phase brachium pontis and the junction of underarm of described three-phase bridge circuit through the 3rd reactor.
5. photovoltaic DC-to-AC converter according to claim 1, is characterized in that, described inverter circuit also comprises capacitance group and grading resistor, and described capacitance group is in parallel with described grading resistor;
The junction of the described upper arm of three-phase brachium pontis described in described three-phase bridge circuit is accessed in one end after described capacitance group is in parallel with described grading resistor, and the other end accesses the junction of the described underarm of three-phase brachium pontis described in described three-phase bridge circuit.
6. the photovoltaic DC-to-AC converter according to any one of claim 1 to 5, is characterized in that, also comprises booster circuit, and the input of described booster circuit is electrically connected with the output of solar battery array;
The output of described booster circuit, by DC bus, is electrically connected with the output of described inverter circuit.
7. photovoltaic DC-to-AC converter according to claim 6, is characterized in that, described booster circuit comprises the first control unit circuit, the first device for power switching, the first inductance, the first diode and the 3rd electric capacity;
The output of described first control unit circuit is connected with the input of described first device for power switching, for inputting the first pulse width modulating signal to described first device for power switching, controls conducting and the disconnection of described first device for power switching;
First output of described first device for power switching is electrically connected with the output of described solar battery array, and the second output of described first device for power switching is electrically connected with one end of described first inductance;
One end of described first diode is electrically connected with one end of described first inductance, and the other end of described first diode is connected with one end of described 3rd electric capacity;
The other end of described 3rd electric capacity is electrically connected with the other end of described first inductance.
8. photovoltaic DC-to-AC converter according to claim 6, is characterized in that, described booster circuit comprises the second control unit, the second device for power switching, the second inductance, the second diode and the 4th electric capacity;
The output of described second control unit is connected with the input of described second device for power switching, for inputting the second pulse width modulating signal to described second device for power switching, controls conducting and the disconnection of described second device for power switching;
First output of described second device for power switching is electrically connected with one end of described second inductance;
Second output of described second device for power switching, is connected by the other end of described solar battery array with described second inductance;
One end of described second diode is electrically connected with the second output of described second device for power switching, and the other end of described second diode is electrically connected with one end of described 4th electric capacity;
The other end of described 4th electric capacity is electrically connected with the second output of described second device for power switching.
9. photovoltaic DC-to-AC converter according to claim 6, it is characterized in that, described booster circuit comprises the 3rd control unit, the 3rd device for power switching, the 4th device for power switching, the 3rd inductance, the 4th inductance, the 3rd diode, the 4th diode and the 5th electric capacity;
First output, second output of described 3rd control unit are connected with the input of described 3rd device for power switching and the input of described 4th device for power switching respectively;
First output of described 3rd device for power switching is electrically connected with one end of described 3rd inductance, the second output of described 3rd device for power switching, is electrically connected by the other end of described solar battery array with described 3rd inductance;
First output of described 4th device for power switching is electrically connected with one end of described 4th inductance, the second output of described 4th device for power switching, is electrically connected by the other end of described solar battery array with described 4th inductance;
One end of described 3rd diode is electrically connected with one end of described 3rd inductance, and the other end of described 3rd diode is electrically connected with one end of described 5th electric capacity;
One end of described 4th diode is electrically connected with one end of described 4th inductance, and the other end of described 4th diode is electrically connected with one end of described 5th electric capacity;
The other end of described 5th electric capacity is electrically connected with the second output of described 4th device for power switching.
10. a PV air-conditioner system, is characterized in that, comprises the photovoltaic DC-to-AC converter described in any one of claim 1 to 9.
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| CN104124884A (en) * | 2014-07-17 | 2014-10-29 | 珠海格力电器股份有限公司 | Photovoltaic inverter and photovoltaic air conditioner system |
| CN105699780A (en) * | 2016-01-05 | 2016-06-22 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Grid-connected inverter commercial power impedance detection method and power factor correction method and device |
| CN110336458A (en) * | 2019-05-10 | 2019-10-15 | 珠海格力电器股份有限公司 | Harmonic wave control circuit, power supply with the circuit and air conditioner |
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| CN113258808A (en) * | 2021-05-07 | 2021-08-13 | 三峡大学 | High power density vehicle AC power supply |
| WO2022077973A1 (en) * | 2020-10-15 | 2022-04-21 | 珠海格力电器股份有限公司 | Photovoltaic power supply system and control method therefor, and air conditioning unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104124884A (en) * | 2014-07-17 | 2014-10-29 | 珠海格力电器股份有限公司 | Photovoltaic inverter and photovoltaic air conditioner system |
| CN105699780A (en) * | 2016-01-05 | 2016-06-22 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Grid-connected inverter commercial power impedance detection method and power factor correction method and device |
| CN105699780B (en) * | 2016-01-05 | 2019-01-04 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Gird-connected inverter mains impedance method for detecting and power factor correcting method and device |
| CN110336458A (en) * | 2019-05-10 | 2019-10-15 | 珠海格力电器股份有限公司 | Harmonic wave control circuit, power supply with the circuit and air conditioner |
| CN112003505A (en) * | 2020-08-24 | 2020-11-27 | 西京学院 | DSP-based electric bicycle digital control system |
| WO2022077973A1 (en) * | 2020-10-15 | 2022-04-21 | 珠海格力电器股份有限公司 | Photovoltaic power supply system and control method therefor, and air conditioning unit |
| CN113258808A (en) * | 2021-05-07 | 2021-08-13 | 三峡大学 | High power density vehicle AC power supply |
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