CN204068407U - Hybrid power supply system and electrical equipment - Google Patents
Hybrid power supply system and electrical equipment Download PDFInfo
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- CN204068407U CN204068407U CN201420238228.XU CN201420238228U CN204068407U CN 204068407 U CN204068407 U CN 204068407U CN 201420238228 U CN201420238228 U CN 201420238228U CN 204068407 U CN204068407 U CN 204068407U
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- 238000004378 air conditioning Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a mix power supply system and electrical equipment. Wherein, mixed power supply system includes: a solar cell array; the input end of the booster circuit is connected with the solar cell array; the direct current bus is connected with the output end of the booster circuit; the converter circuit is connected with the direct-current bus and is connected with a three-phase alternating-current power supply, wherein the converter circuit is provided with a three-phase full-bridge power device; the input end of the inverter is connected with the direct current bus; and the motor is connected with the output end of the inverter. Through the utility model discloses, the problem that mixed power supply system is suitable for the power singleness among the prior art has been solved, and then has reached the effect that enlarges mixed power supply system application.
Description
Technical field
The utility model relates to for electrical domain, in particular to a kind of mixed power supply system and electric equipment.
Background technology
Fig. 1 is the topological diagram of mixed power supply system in prior art, as shown in Figure 1, this mixed power supply system mainly comprises: solar battery array 10, BOOST1 booster circuit (comprises inductance L 1 ', diode D1 ' and the switching tube by PWM1 signal controlling), AC power AC, rectifier bridge 20, BOOST2 booster circuit (comprises inductance L 2 ', diode D2 ' and the switching tube by PWM2 signal controlling), electric capacity C, inverter 30 and motor M, wherein, the single-phase alternating current (i.e. civil power) of AC power AC to be rated voltage be 220VAC, rectifier bridge 20 is single-phase rectification bridge stack.The power supply the principle of this mixed power supply system is as follows:
The output of solar battery array 10 is through BOOST1 booster circuit access DC bus side, and the PWM1 signal of the switching tube in BOOST1 booster circuit is produced by solar cell output power system.
AC power AC is through rectifier bridge 20 and BOOST2 booster circuit access DC bus side, and the PWM2 signal of the switching tube in BOOST2 booster circuit is provided by Active PFC control system.
It is single that the mixed power supply system of said structure is suitable for power supply, and be only applicable to single phase poaer supply (civil power), the occasion being three phase mains for AC power AC cannot use, and motor M power is less, is only applicable to family expenses, is not suitable for commercialization.And, there is integrity problem and the low problem of solar energy utilization ratio in the mixed power supply system of said structure, when the power output of solar battery array 10 is greater than the consumed power of motor M, the path that unnecessary energy does not discharge, the dc-link capacitance of inverter can be caused to add up electricity more and more higher, finally cause inverter to damage.Although equal air-conditioning consumed power by controlling solar battery array power output, can head it off, but do not ensure that solar battery array power output is always maximum, also namely maximum power tracing efficiency (MPPT) is low, and solar energy utilization ratio does not reach optimum.
Be suitable for the single problem of power supply for mixed power supply system in correlation technique, not yet propose effective solution at present.
Utility model content
Main purpose of the present utility model is to provide a kind of mixed power supply system and electric equipment, is suitable for the single problem of power supply to solve mixed power supply system in prior art.
To achieve these goals, according to an aspect of the present utility model, a kind of mixed power supply system is provided.
Comprise according to mixed power supply system of the present utility model: solar battery array; Booster circuit, input is connected with solar battery array; DC bus, is connected with the output of booster circuit; Convertor circuit, is connected with DC bus, and connects three-phase alternating-current supply, and wherein, convertor circuit has three phase full bridge power device; Inverter, input is connected with DC bus; And motor, be connected with the output of inverter.
Further, convertor circuit is two-way current conversion circuit, and mixed power supply system also comprises: the first controller, is connected with convertor circuit, is in inverter mode or rectification state for controlling convertor circuit; And second controller, be connected with booster circuit, for regulating the power output of solar battery array by controlling booster circuit.
Further, under convertor circuit is in rectification state, first controller is also for the voltage reference value according to DC bus, the real-time voltage value of DC bus, the real-time phase voltage value of three-phase alternating-current supply and the real-time phase current values of three-phase alternating-current supply produce the control signal of three phase full bridge power device, under convertor circuit is in inverter mode, first controller is also for the voltage reference value according to DC bus, the real-time voltage value of DC bus, power output, the consumed power of motor, real-time phase voltage value and real-time phase current values produce the control signal of three phase full bridge power device.
Further, the first controller comprises: first adder, and normal phase input end receives the voltage reference value of DC bus, and inverting input receives the real-time voltage value of DC bus; First adjuster, input is connected with the output of first adder, for carrying out proportion integration differentiation adjustment to the difference of the voltage reference value of DC bus and the real-time voltage value of DC bus, obtains value and power reference; First multiplier, first input end is connected with the output of the first adjuster, and the second input receives real-time phase voltage value, for value and power reference and real-time phase voltage value being processed, obtains phase-current reference value; Second adder, normal phase input end is connected with the output of the first multiplier, and inverting input receives real-time phase current values; Second adjuster, input is connected with the output of second adder, for the difference of phase-current reference value and real-time phase current values is carried out proportion integration differentiation adjustment; 3rd adder, the first normal phase input end is connected with the output of the second adjuster, and the second normal phase input end receives real-time phase voltage value; Converter, is connected with the output of the 3rd adder, for converting the Output rusults of the 3rd adder, obtains the phase voltage reference value of real-time phase voltage; And first comparator, first input end is connected with the output of converter, and the second input receives presets carrier wave, and output is connected with three phase full bridge power device, for generation of the control signal of three phase full bridge power device.
Further, the first controller also comprises: the 4th adder, and normal phase input end receives the voltage reference value of DC bus, and inverting input receives the real-time voltage value of DC bus; 3rd adjuster, input is connected with the output of the 4th adder, for carrying out proportional integral adjustment to the difference of the voltage reference value of DC bus and the real-time voltage value of DC bus, obtains value and power reference; Second multiplier, the difference of first input end received output power and consumed power, the second input is connected with the output of the 3rd adjuster, and the 3rd input receives real-time phase voltage value, for output current phase reference value; Slender acanthopanax musical instruments used in a Buddhist or Taoist mass, normal phase input end is connected with the output of the second multiplier, and inverting input receives real-time phase current values; 4th adjuster, is connected with the output of slender acanthopanax musical instruments used in a Buddhist or Taoist mass, for the difference of phase-current reference value and real-time phase current values is carried out proportional integral adjustment; And second comparator, first input end is connected with the output of the 4th adjuster, and the second input receives presets carrier wave, and output is connected with three phase full bridge power device, for generation of the control signal of three phase full bridge power device.
Further, booster circuit comprises device for power switching, wherein, second controller is used for producing according to the real-time current value of the voltage reference value of solar battery array, the real-time voltage value of solar battery array and solar battery array the control signal controlling device for power switching.
Further, second controller comprises: the 6th adder, and normal phase input end receives the voltage reference value of solar battery array, and inverting input receives the real-time voltage value of solar battery array; 5th adjuster, is connected with the output of the 6th adder, for carrying out proportional integral adjustment to the difference of the voltage reference value of solar battery array and the real-time voltage value of solar battery array, obtains current reference value; 7th adder, normal phase input end is connected with the output of the 5th adjuster, and inverting input receives real-time current value; And the 6th adjuster, being connected with the output of the 7th adder, for carrying out proportional integral adjustment to the difference of current reference value and real-time current value, producing the control signal of device for power switching.
To achieve these goals, according to second aspect of the present utility model, provide a kind of electric equipment.
Comprise according to electric equipment of the present utility model: any one mixed power supply system that the utility model foregoing provides, wherein, the motor of mixed power supply system is the drive motors of electric equipment.
Further, electric equipment is air-conditioner set, and motor is the compressor of air-conditioner set.
The utility model adopts the mixed power supply system with following structure: solar battery array; Booster circuit, input is connected with solar battery array; DC bus, is connected with the output of booster circuit; Convertor circuit, is connected with DC bus, and connects three-phase alternating-current supply, and wherein, convertor circuit has three phase full bridge power device; Inverter, input is connected with DC bus; And motor, be connected with the output of inverter.By arranging three phase full bridge power device in convertor circuit, achieve that can to connect three-phase alternating-current supply be that motor is powered, family expenses and the commercial appliance of different capacity grade needs can be applied to, achieve high-power electric appliance and can use three phase network and solar energy system hybrid power supply, solve mixed power supply system in prior art and be suitable for the single problem of power supply, and then reach the effect expanding mixed power supply system application scenario.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the topological diagram of the mixed power supply system according to correlation technique;
Fig. 2 is the schematic diagram of the mixed power supply system according to the utility model embodiment;
Fig. 3 is the mixed power supply system according to the utility model embodiment, the connecting circuit figure of the first controller and convertor circuit;
Fig. 4 is the mixed power supply system according to the utility model embodiment, the connecting circuit figure of second controller and booster circuit;
Fig. 5 is a kind of structure chart of the first controller in Fig. 3;
Fig. 6 is the another kind of structure chart of the first controller in Fig. 3;
Fig. 7 is a kind of structure chart of second controller in Fig. 4;
Fig. 8 is the mixed power supply system according to the utility model embodiment, the connection diagram of the first controller, second controller and the 3rd controller;
Fig. 9 is the flow chart of the method for supplying power to of mixed power supply system according to the utility model embodiment; And
Figure 10 is the curve synoptic diagram of the method for supplying power to of the mixed power supply system according to the utility model embodiment, solar battery array output characteristic.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
The utility model embodiment provides a kind of mixed power supply system, is specifically introduced below to the mixed power supply system that the utility model embodiment provides:
Fig. 2 is the schematic diagram of the mixed power supply system according to the utility model embodiment, as shown in Figure 2, this mixed power supply system mainly comprises solar battery array 10, booster circuit 40, DC bus 50, convertor circuit 60, inverter 30 and motor M, wherein, convertor circuit 60 mainly comprises three phase full bridge power device, energy storage inductor and filter inductance L1, L2 and L3, storage capacitor C1 and C2, grading resistor R1 and R2, wherein, three phase full bridge power device is the Intelligent Power Module (Intelligent Power Module is called for short IPM) of convertor circuit 60.Booster circuit 40 is boost booster circuit, and its input is connected with solar battery array 10, and output is connected to DC bus 50.Convertor circuit 60 for connecting three-phase alternating-current supply 70, and is connected with DC bus 50.The input of inverter 30 is connected with DC bus 50, and output is connected with motor M.
The mixed power supply system that the utility model embodiment provides, by arranging three phase full bridge power device in convertor circuit, achieve that can to connect three-phase alternating-current supply be that motor is powered, family expenses and the commercial appliance of different capacity grade needs can be applied to, achieve high-power electric appliance and can use three phase network and solar energy system hybrid power supply, solve mixed power supply system in prior art and be suitable for the single problem of power supply, and then reach the effect expanding mixed power supply system application scenario.
Further, in the utility model embodiment, convertor circuit 60 is two-way current conversion circuit, and as shown in Fig. 3 and Fig. 4, mixed power supply system also comprises the first controller 80 and second controller 90.
Wherein, second controller 90 is connected with booster circuit 40, for regulating the power output of solar battery array 10 by controlling booster circuit 40, realize the maximum power tracing (MPPT) to solar battery array 10, ensure that solar battery array 10 power output under the sunlight of constant intensity is maximum, to realize the energy saving standard of whole system, reach the utilance that solar energy is provided.
First controller 80 is connected with convertor circuit 60, is in inverter mode or rectification state for controlling convertor circuit 60.When the power output of solar battery array 10 is less than the consumed power of motor M operation, whole solar power is used for the consumption of motor M, and the first controller 80 controls convertor circuit 60 and works in rectification state, supplied from three-phase alternating-current supply 70 by convertor circuit 60 to make not enough energetic portions.When solar battery array 10 does not generate electricity, the first controller 80 controls convertor circuit 60 and works in rectification state, and motor M all uses three-phase alternating-current supply 70.When the power output of solar battery array 10, when equaling the consumed power of motor M, whole solar power is used for the consumption of motor M.When the power output of solar battery array 10, when being greater than the consumed power of motor M, part solar power is for meeting whole consumption of motor M, first controller 80 controls convertor circuit 60 and works in inverter mode, makes the redundance of solar power return three-phase alternating-current supply 70 by convertor circuit 60 inversion.Like this, achieve when the power output of solar battery array 10 is greater than consumed power, unnecessary energy can return three-phase alternating-current supply 70 by convertor circuit 60 inversion, more and more higher the caused inverter 30 of the capacitive accumulation energy on DC bus 50 is avoided to damage, reach on the basis ensureing Solar use, improve the reliability of electric power system.
Particularly, as shown in Figures 2 and 3, three phase full bridge power device is divided into six unit, each unit is by insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, be called for short IGBT) and diodes in parallel combine, in Fig. 3, SI is the current sensor carrying out current detecting.The control signal PWM1-PWM6 of IGBT is produced by the first controller 80.
When the first controller 80 control convertor circuit 60 work in full-controlled rectifier pattern time, energy flows into convertor circuit 60 by three-phase alternating-current supply 70.The operation principle of convertor circuit 60 is described: when IGBT Q2 conducting for R phase, electric current through energy storage inductor L1, flows into Q2 from R phase, flow through D4 or D6, arrive S-phase or T-phase and its energy storage inductor L2 or L3, in Q2 conduction period, energy storage inductor L1 electric current rises, storage power; When Q2 turns off, the energy being stored in energy storage inductor L1 flow into the electric capacity on current transformer DC bus through diode D1, thus realizes energy and flow into photovoltaic converter by electrical network.
Under full-controlled rectifier pattern, (x=r, s, waveform phase t) follow phase voltage Vx, and (x=r, s, waveform phase t), thus improve power factor reduce harmonic components and content must to regulate three-phase phase current Ix in real time.In the utility model embodiment, be in the situation under rectification state for convertor circuit 60, the first controller 80 produces the control signal of three phase full bridge power device according to the real-time phase current values of the voltage reference value of DC bus 50, the real-time voltage value of DC bus 50, the real-time phase voltage value of three-phase alternating-current supply 70 and three-phase alternating-current supply 70.Its control mode adopts double-closed-loop control, and outer shroud is Voltage loop, and major control DC bus-bar voltage is fixed value VDC_REF; Inner ring is electric current loop, its reference value Ir_REF controls through PID the value and power reference that exports by outer voltage and actual phase voltage Vx (x=r, s, t) to obtain after multiplier, the difference of current reference value and actual detected value carries out PID control, its Output rusults and actual phase voltage Vx (x=r, s, t) be added after after converting, obtain reference value VPWM_X (x=r, the s, t) of each phase phase voltage, then SPWM modulator approach is adopted, by VPWM_X (x=r, s, t) and triangular carrier make comparisons, produce the pwm signal of control IGBT.For each phase, the pwm signal of upper and lower bridge arm IGBT is complementary, namely can not conducting simultaneously.
A kind of concrete structure of the first controller 80 has been shown in Fig. 5, the control signal of three phase full bridge power device is produced by the first controller 80 shown in Fig. 5, as shown in Figure 5, first controller 80 mainly comprises first adder 8001, first adjuster 8002, first multiplier 8003, second adder 8004, second adjuster 8005, the 3rd adder 8006, converter 8007 and the first comparator 8008, particularly:
The normal phase input end of first adder 8001 receives the voltage reference value of DC bus 50, and inverting input receives the real-time voltage value of DC bus 50.The input of the first adjuster 8002 is connected with the output of first adder 8001, regulate for carrying out proportion integration differentiation (PID) to the difference of the voltage reference value of DC bus 50 and the real-time voltage value of DC bus 50, obtain value and power reference.The first input end of the first multiplier 8003 is connected with the output of the first adjuster 8002, and the second input receives real-time phase voltage value, for value and power reference and real-time phase voltage value being processed, obtains phase-current reference value.The normal phase input end of second adder 8004 is connected with the output of the first multiplier 8003, and inverting input receives real-time phase current values.The input of the second adjuster 8005 is connected with the output of second adder 8004, for the difference of phase-current reference value and real-time phase current values is carried out proportion integration differentiation adjustment.First normal phase input end of the 3rd adder 8006 is connected with the output of the second adjuster 8005, and the second normal phase input end receives real-time phase voltage value.Converter 8007 is connected with the output of the 3rd adder 8006, for converting the Output rusults of the 3rd adder 8006, obtains the phase voltage reference value of real-time phase voltage.The first input end of the first comparator 8008 is connected with the output of converter 8007, and the second input receives presets carrier wave, and output is connected with three phase full bridge power device, for generation of the control signal of three phase full bridge power device.
When the first controller 80 control convertor circuit 60 work in full control inverter mode time, energy flows into three-phase alternating-current supply 70 by convertor circuit 60.Its operation principle is: because convertor circuit is connected with three-phase alternating-current supply 70 line voltage, its output voltage is determined by three-phase alternating-current supply 70 voltage, therefore only have the electric current of control inputs three-phase alternating-current supply 70, reach the object toward three-phase alternating-current supply 70 input power; Simultaneously, the current harmonic content of input three-phase alternating-current supply 70 must meet Standard, therefore must detect the phase place of three-phase alternating-current supply 70 voltage simultaneously, reach and the requirement of three-phase alternating-current supply 70 voltage with frequency homophase with the electric current guaranteeing to input three-phase alternating-current supply 70.
In the utility model embodiment, situation under inverter mode is in for convertor circuit 60, the first controller 80 according to the real-time voltage value of the voltage reference value of DC bus 50, DC bus 50, power output, the consumed power of motor M, in real time phase voltage value and in real time phase current values produce the control signal of three phase full bridge power device.Its control mode adopts double-loop control, and outer shroud is Voltage loop, and major control DC bus-bar voltage is fixed value VDC_REF and need higher than line voltage; Inner ring is electric current loop, its reference value by outer voltage and voltage phase-locked loop given, by carrying out PI control to the difference of current inner loop reference value and actual detected value, obtain convertor circuit every phase output voltage Ux (x=a, b, reference value c), then SPWM modulator approach is adopted, by Ux (x=a, b, c) and triangular carrier make comparisons, produce the pwm signal of control IGBT.For each phase, the pwm signal of upper and lower bridge arm IGBT is complementary, namely can not conducting 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.
The another kind of concrete structure of the first controller 80 has been shown in Fig. 6, the control signal of three phase full bridge power device is produced by the first controller 80 shown in Fig. 6, as shown in Figure 6, first controller 80 mainly comprises the 4th adder 8009, the 3rd adjuster 8010, second multiplier 8011, slender acanthopanax musical instruments used in a Buddhist or Taoist mass 8012, the 4th adjuster 8013 and the second comparator 8014, particularly: the normal phase input end of the 4th adder 8009 receives the voltage reference value of DC bus 50, inverting input receives the real-time voltage value of DC bus 50.The input of the 3rd adjuster 8010 is connected with the output of the 4th adder 8009, for carrying out proportional integral adjustment to the difference of the voltage reference value of DC bus 50 and the real-time voltage value of DC bus 50, obtains value and power reference.The first input end received output power of the second multiplier 8011 and the difference of consumed power, the second input is connected with the output of the 3rd adjuster 8010, and the 3rd input receives real-time phase voltage value, for output current phase reference value.The normal phase input end of slender acanthopanax musical instruments used in a Buddhist or Taoist mass 8012 is connected with the output of the second multiplier 8011, and inverting input receives real-time phase current values.4th adjuster 8013 is connected with the output of slender acanthopanax musical instruments used in a Buddhist or Taoist mass 8012, for the difference of phase-current reference value and real-time phase current values is carried out proportional integral adjustment.The first input end of the second comparator 8014 is connected with the output of the 4th adjuster 8013, and the second input receives presets carrier wave, and output is connected with three phase full bridge power device, for generation of the control signal of three phase full bridge power device.
Further, as shown in Figure 2 and Figure 4, booster circuit 40 comprises device for power switching Q7, energy storage inductor L7 and diode D7, its operation principle is when device for power switching Q7 conducting, energy storage inductor L7 electric current increases, because inductance has the characteristic that electric current can not suddenly change, at device for power switching Q7 blocking interval, the voltage that energy storage inductor L7 produces adds the output voltage of solar battery array, through diode D7, charging on storage capacitor C1 and C2, thus the output energy of solar battery array 10 is forwarded on DC bus.Wherein, second controller 90 is by controlling the conducting of device for power switching Q7 or turning off duration, control the power output of solar battery array 10, the control signal that device for power switching Q7 controls is produced by second controller 90, second controller 90 is by pulse-width modulation (Pulse-Width Modulation, be called for short PWM) device for power switching Q7 in signal controlling BOOST booster circuit 40, control the power output of solar battery array.The direct current that solar battery array exports, is directly inputted to DC bus 50 after BOOST booster circuit 40.
A kind of concrete structure of second controller 90 has been shown in Fig. 7, the control signal of device for power switching Q7 is produced by the second controller 90 shown in Fig. 7, as shown in Figure 7, second controller 90 mainly comprises the 6th adder 9001, the 5th adjuster 9002, the 7th adder 9003 and the 6th adjuster 9004, particularly, the normal phase input end of the 6th adder 9001 receives the voltage reference value of solar battery array 10, and inverting input receives the real-time voltage value of solar battery array 10.5th adjuster 9002 is connected with the output of the 6th adder 9001, for carrying out proportional integral adjustment to the difference of the voltage reference value of solar battery array 10 and the real-time voltage value of solar battery array 10, obtains current reference value.The normal phase input end of the 7th adder 9003 is connected with the output of the 5th adjuster 9002, and inverting input receives real-time current value.6th adjuster 9004 is connected with the output of the 7th adder 9003, for carrying out proportional integral adjustment to the difference of current reference value and real-time current value, produces the control signal of device for power switching Q7.
Further, the mixed power supply system of the utility model embodiment also comprises the 3rd controller 100 be all connected with the first controller 80 and second controller 90,3rd controller 100 is energy smart allocation unit of whole mixed power supply system, the function mainly playing detection, calculating, distribution and perform, object ensures optimal utilization solar power generation energy.Fig. 8 is the connection diagram of the first controller 80, second controller 90 and the 3rd controller 100, as shown in Figure 8,3rd controller 100 is according to the output voltage Vpv of solar battery array and electric current I pv, calculate the power output Ppv of solar battery array, according to direct voltage VDC and the direct current IDC of DC bus 50, calculate the consumed power P of motor M
load, and calculate the difference DELTA P=P of power output and consumed power
pv-P
load, the size of the first controller 80 according to difference DELTA P controls two-way current conversion circuit 60 and is in inverter mode or rectification state, particularly,
1., as △ P=0, the power output of solar battery array is all for load consumption, and two-way current conversion circuit 60 works in holding state;
2. as △ P>0, the power output of solar battery array is greater than load consumption, and excess energy can feedback three-phase alternating-current supply 70, controls two-way current conversion circuit 60 and runs on inversion grid connection (DC/AC) state;
3. as △ P<0, the power output of solar battery array is less than load consumption, and not enough energetic portions is supplied by three-phase alternating-current supply 70, controls two-way current conversion circuit 60 and runs on full-controlled rectifier (AC/DC) state.
It should be noted that, the first controller 80, second controller 90 and the 3rd controller 100 can be the independent control devices arranged, and also can be same control devices.
The utility model embodiment still provides a kind of electric equipment, and this electric equipment comprises any one mixed power supply system that the utility model foregoing provides, and wherein, the motor M of mixed power supply system is the drive motors of electric equipment.
By adopting above-mentioned mixed power supply system as the power supply source of electric equipment, because above-mentioned mixed power supply system can use three phase network and solar energy system hybrid power supply, therefore, the electric equipment possessing above-mentioned mixed power supply system has applicable power supply and application scenario advantage widely.
Particularly, electric equipment can be air-conditioner set, and motor M is then the compressor of air-conditioner set.
The utility model embodiment still provides a kind of method of supplying power to of mixed power supply system, the mixed power supply system that this method of supplying power to provides mainly through the utility model embodiment foregoing is powered, mixed power supply system comprises DC bus, solar battery array and has the convertor circuit of three phase full bridge power device, and the method for supplying power to of the mixed power supply system that following the utility model embodiment provides is specifically introduced:
Fig. 9 is the flow chart of the method for supplying power to of mixed power supply system according to the utility model embodiment, and as shown in Figure 9, this method of supplying power to mainly comprises the steps S902 and step S904:
S902: utilize solar battery array to DC bus powered, that is, carry out solar powered.
S904: connect three-phase alternating-current supply to DC bus powered by convertor circuit, that is, carry out three-phase alternating-current supply and power.
The method of supplying power to of the mixed power supply system that the utility model embodiment provides, three-phase alternating-current supply is connected by utilizing convertor circuit, achieve and three-phase alternating-current supply can be utilized to power, family expenses and the commercial appliance of different capacity grade needs can be applied to, achieve high-power electric appliance and can use three phase network and solar energy system hybrid power supply, solve mixed power supply system in prior art and be suitable for the single problem of power supply, and then reach the effect expanding mixed power supply system application scenario.
Wherein, mixed power supply system also comprises the booster circuit be connected with solar battery array, utilize solar battery array to mainly DC bus powered, the power output of solar battery array is regulated by controlling booster circuit, to realize ensureing that solar battery array power output under the sunlight of constant intensity is maximum to the maximum power tracing (MPPT) of solar panel, to realize the energy saving standard of whole system, reach the utilance that solar energy is provided.
Further, for solar battery array, its output characteristic is mainly subject to the impact of intensity of illumination and temperature, and in intensity of illumination one timing, its characteristic district line is substantially constant, as the curve l1 in Figure 10 and curve l2, and intensities of illumination corresponding different respectively.
As characteristic curve l1, when solar panel output current Ipv is zero, output voltage is Vo to the maximum, is called for short open circuit voltage; When solar panel output voltage Vpv is zero, output current is Io to the maximum, is called for short open-circuit current; When solar panel output voltage be Vpv=Um, output current be Ipv=Im time, power output Ppv=Pm is maximum.When solar panel output voltage be Vpv=U1, output current be Ipv=I1 time, power output is Ppv=P1<Pm.Therefore, can be Um by controlling solar panel output voltage, realize controlling boost module to the maximum power tracing (MPPT) of solar panel, particularly, in the utility model embodiment, the following double-closed-loop control method of main employing regulates the power output of solar battery array to comprise:
Obtain voltage reference value and the real-time voltage value of solar battery array; Calculate the voltage reference value of solar battery array and the voltage difference of real-time voltage value; Proportional integral adjustment is carried out to voltage difference, obtains current reference value; Obtain the real-time current value of solar battery array; The current differential of calculating current reference value and real-time current value; And proportional integral adjustment is carried out to current differential, produce the control signal of the power output regulating solar battery array.
Preferably, the method for supplying power to of the mixed power supply system of the utility model embodiment also comprises: following steps S1 is to step S7:
S1: the power output P obtaining solar battery array
pv, and obtain the consumed power P of the motor be connected with DC bus
load.
S3: compare power output P
pvwith consumed power P
loadsize.
S5: comparing power output P
pvbe less than consumed power P
loadwhen, control convertor circuit and work in rectification state.
S7: comparing power output P
pvbe greater than consumed power P
loadwhen, control convertor circuit and work in inverter mode.
By the power output P to solar battery array
pvwith consumed power P
loadcompare, and when the power output of solar battery array is relatively little, controls convertor circuit and work in rectification state, obtain energy supplement to use electric loading from three-phase alternating-current supply.When power output is relatively large, control convertor circuit and work in inverter mode, the redundance of solar power is made to return three-phase alternating-current supply by convertor circuit inversion, achieve when the power output of solar battery array is greater than consumed power, unnecessary energy can return three-phase alternating-current supply by convertor circuit inversion, more and more higher the caused inverter of the capacitive accumulation energy on DC bus is avoided to damage, reach on the basis ensureing Solar use, improve the reliability of electric power system.
Further, under in control, convertor circuit works in rectification state, method of supplying power to also comprises: the control signal producing three phase full bridge power device according to the real-time phase current values of the voltage reference value of DC bus, the real-time voltage value of DC bus, the real-time phase voltage value of three-phase alternating-current supply and three-phase alternating-current supply.Under in control, convertor circuit works in inverter mode, method of supplying power to also comprises: according to the power output of the real-time voltage value of the voltage reference value of DC bus, DC bus, solar battery array, consumed power, in real time phase voltage value and in real time phase current values produce the control signal of three phase full bridge power device.
Particularly, the control signal producing three phase full bridge power device according to the real-time phase current values of the voltage reference value of DC bus, the real-time voltage value of DC bus, the real-time phase voltage value of three-phase alternating-current supply and three-phase alternating-current supply comprises: the voltage reference value and the real-time voltage value that obtain DC bus; Proportion integration differentiation adjustment is carried out to the voltage reference value of DC bus and the difference of real-time voltage value, obtains value and power reference; The real-time phase voltage value of value and power reference and three-phase alternating-current supply is obtained phase-current reference value through multiplier process; The difference of the real-time phase current values of phase-current reference value and three-phase alternating-current supply is carried out proportion integration differentiation adjustment, obtains phase voltage reference value; Carry out sinusoidal pulse width modulation to phase voltage reference value and obtain the first modulation-demodulation signal, the first modulation-demodulation signal is under convertor circuit works in rectification state, the control signal of three phase full bridge power device.
Comprise according to the power output of the real-time voltage value of the voltage reference value of DC bus, DC bus, solar battery array, consumed power, in real time phase voltage value and phase current values produces three phase full bridge power device in real time control signal: the voltage reference value and the real-time voltage value that obtain DC bus; Proportional integral adjustment is carried out to the voltage reference value of DC bus and the difference of real-time voltage value, obtains value and power reference; By the real-time phase voltage value of the difference of power output and consumed power, value and power reference and three-phase alternating-current supply through multiplier process, obtain phase-current reference value; The difference of the real-time phase current values of phase-current reference value and three-phase alternating-current supply is carried out proportional integral adjustment, obtains phase voltage reference value; And sinusoidal pulse width modulation is carried out to phase voltage reference value obtain the second modulation-demodulation signal, the second modulation-demodulation signal is under convertor circuit works in inverter mode, the control signal of three phase full bridge power device.
From above description, can find out, the utility model achieves and three-phase alternating-current supply can be utilized to power, family expenses and the commercial appliance of different capacity grade needs can be applied to, achieve high-power electric appliance and can use three phase network and solar energy system hybrid power supply, further, also reach the optimal utilization that solar energy is sent, and ensure the reliability of complete machine.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. a mixed power supply system, is characterized in that, comprising:
Solar battery array (10);
Booster circuit (40), input is connected with described solar battery array (10);
DC bus (50), is connected with the output of described booster circuit (40);
Convertor circuit (60), is connected with described DC bus (50), and connects three-phase alternating-current supply (70), and wherein, described convertor circuit (60) has three phase full bridge power device;
Inverter (30), input is connected with described DC bus (50); And
Motor (M), is connected with the output of described inverter (30).
2. mixed power supply system according to claim 1, is characterized in that, described convertor circuit (60) is two-way current conversion circuit, and described mixed power supply system also comprises:
First controller (80), is connected with described convertor circuit (60), is in inverter mode or rectification state for controlling described convertor circuit (60); And
Second controller (90), is connected with described booster circuit (40), for regulating the power output of described solar battery array (10) by controlling described booster circuit (40).
3. mixed power supply system according to claim 2, is characterized in that:
Under described convertor circuit (60) is in described rectification state, described first controller (80) also produces the control signal of described three phase full bridge power device for the real-time phase voltage value of the voltage reference value according to described DC bus (50), the real-time voltage value of described DC bus (50), described three-phase alternating-current supply (70) and the real-time phase current values of described three-phase alternating-current supply (70)
Under described convertor circuit (60) is in described inverter mode, described first controller (80) also produces the control signal of described three phase full bridge power device for the consumed power of the voltage reference value according to described DC bus (50), the real-time voltage value of described DC bus (50), described power output, described motor (M), described real-time phase voltage value and described real-time phase current values.
4. mixed power supply system according to claim 3, is characterized in that, described first controller (80) comprising:
First adder (8001), normal phase input end receives the voltage reference value of described DC bus (50), and inverting input receives the real-time voltage value of described DC bus (50);
First adjuster (8002), input is connected with the output of described first adder (8001), for carrying out proportion integration differentiation adjustment to the difference of the voltage reference value of described DC bus (50) and the real-time voltage value of described DC bus (50), obtain value and power reference;
First multiplier (8003), first input end is connected with the output of described first adjuster (8002), second input receives described real-time phase voltage value, for described value and power reference and described real-time phase voltage value being processed, obtains phase-current reference value;
Second adder (8004), normal phase input end is connected with the output of described first multiplier (8003), and inverting input receives described real-time phase current values;
Second adjuster (8005), input is connected with the output of described second adder (8004), for the difference of described phase-current reference value and described real-time phase current values is carried out proportion integration differentiation adjustment;
3rd adder (8006), the first normal phase input end is connected with the output of described second adjuster (8005), and the second normal phase input end receives described real-time phase voltage value;
Converter (8007), is connected with the output of described 3rd adder (8006), for converting the Output rusults of described 3rd adder (8006), obtains the phase voltage reference value of described real-time phase voltage; And
First comparator (8008), first input end is connected with the output of described converter (8007), second input receives presets carrier wave, and output is connected with described three phase full bridge power device, for generation of the control signal of described three phase full bridge power device.
5. mixed power supply system according to claim 3, is characterized in that, described first controller (80) also comprises:
4th adder (8009), normal phase input end receives the voltage reference value of described DC bus (50), and inverting input receives the real-time voltage value of described DC bus (50);
3rd adjuster (8010), input is connected with the output of described 4th adder (8009), for carrying out proportional integral adjustment to the difference of the voltage reference value of described DC bus (50) and the real-time voltage value of described DC bus (50), obtain value and power reference;
Second multiplier (8011), first input end receives the difference of described power output and described consumed power, second input is connected with the output of described 3rd adjuster (8010), 3rd input receives described real-time phase voltage value, for output current phase reference value;
Slender acanthopanax musical instruments used in a Buddhist or Taoist mass (8012), normal phase input end is connected with the output of described second multiplier (8011), and inverting input receives described real-time phase current values;
4th adjuster (8013), is connected with the output of described slender acanthopanax musical instruments used in a Buddhist or Taoist mass (8012), for the difference of described phase-current reference value and described real-time phase current values is carried out proportional integral adjustment; And
Second comparator (8014), first input end is connected with the output of described 4th adjuster (8013), second input receives presets carrier wave, output is connected with described three phase full bridge power device, for generation of the control signal of described three phase full bridge power device.
6. mixed power supply system according to claim 2, it is characterized in that, described booster circuit (40) comprises device for power switching (Q7), wherein, described second controller (90) produces for the real-time voltage value of the voltage reference value according to described solar battery array (10), described solar battery array (10) and the real-time current value of described solar battery array (10) control signal controlling described device for power switching (Q7).
7. mixed power supply system according to claim 6, is characterized in that, described second controller (90) comprising:
6th adder (9001), normal phase input end receives the voltage reference value of described solar battery array (10), and inverting input receives the real-time voltage value of described solar battery array (10);
5th adjuster (9002), be connected with the output of described 6th adder (9001), for carrying out proportional integral adjustment to the difference of the voltage reference value of described solar battery array (10) and the real-time voltage value of described solar battery array (10), obtain current reference value;
7th adder (9003), normal phase input end is connected with the output of described 5th adjuster (9002), and inverting input receives described real-time current value; And
6th adjuster (9004), be connected with the output of described 7th adder (9003), for carrying out proportional integral adjustment to the difference of described current reference value and described real-time current value, produce the control signal of described device for power switching (Q7).
8. an electric equipment, is characterized in that, comprises the mixed power supply system according to any one of claim 1 to 7, wherein, and the drive motors that the motor (M) of described mixed power supply system is described electric equipment.
9. electric equipment according to claim 8, is characterized in that, described electric equipment is air-conditioner set, the compressor that described motor (M) is described air-conditioner set.
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| CN201420238228.XU CN204068407U (en) | 2013-12-24 | 2014-05-09 | Hybrid power supply system and electrical equipment |
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| CN102705944B (en) * | 2012-06-28 | 2014-11-19 | 南车株洲电力机车研究所有限公司 | Solar frequency-conversion air-conditioning system |
| CN203199848U (en) * | 2013-01-10 | 2013-09-18 | 杭州浙阳电气有限公司 | Energy feedback type solar elevator |
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