CN104734553B - converter, photovoltaic power generation system and control method thereof - Google Patents

converter, photovoltaic power generation system and control method thereof Download PDF

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Publication number
CN104734553B
CN104734553B CN201310728418.XA CN201310728418A CN104734553B CN 104734553 B CN104734553 B CN 104734553B CN 201310728418 A CN201310728418 A CN 201310728418A CN 104734553 B CN104734553 B CN 104734553B
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Prior art keywords
current transformer
power
module
grid
current
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CN104734553A (en
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陈洪涛
孙丰涛
程良意
李辉
张凯强
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02J3/383—
    • 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
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a converter, a photovoltaic power generation system and a control method thereof. Wherein, the converter includes: the boosting module is used for connecting the solar cell array; the rectification inversion grid-connected module is used for connecting a public power grid; the converter direct current bus is connected between the boosting module and the rectification inversion grid-connected module, wherein the converter direct current bus is provided with a bus interface and is used for connecting a load direct current bus of an electric load; and the controller is connected with the boosting module and the rectification inversion grid-connected module, and is used for controlling the output power of the solar cell array through the boosting module and controlling the rectification inversion grid-connected module to be in an inversion state or a rectification state. According to the invention, the problem that the energy flow direction of a photovoltaic power generation and utilization system in the prior art is single is solved, the bidirectional flow of energy between the converter and the power grid is controlled, and the effect of ensuring the normal operation of the power load under the condition of power grid outage is achieved.

Description

Current transformer, photovoltaic hair electric system and its control method
Technical field
The present invention relates to field of photovoltaic technology, in particular to a kind of current transformer, photovoltaic hair electric system and its control Method.
Background technology
Fig. 1 is the schematic diagram of photovoltaic hair electric system in the prior art, as shown in figure 1, whole system mainly includes the sun Can array 10, photovoltaic DC-to-AC converter 20 ', utility network 30 and with electric loading 40, wherein, photovoltaic DC-to-AC converter 20 ' generally comprises Copped wave module（That is, DC/DC modules）21st, inversion grid connection module 22, the inversion of connection copped wave module 21 and inversion grid connection module 22 Device dc bus 23 ' and controller 24.The characteristics of photovoltaic hair electric system of such a structure is：
A) its function is that DC inverter caused by solar battery array is returned to utility network, with electric loading again nearby From power network power taking, include the various electrical equipments such as air-conditioning, refrigerator, instrument with electric loading.
B) the DC/DC modules in photovoltaic DC-to-AC converter, namely direct current inversion of direct current electricity module, are mainly realized to solar cell The maximum power tracing of array（MPPT）；DC/AC inversion grid connection modules, namely direct current become AC module, from solar energy Utility network is returned in the energy inversion of array output；Controller, it is main to produce DC/DC modules and DC/AC inversion grid connection modules Pwm control signal.
Such a photovoltaic hair electric system has the following disadvantages：
1）Energy flow direction is single.Energy can only flow into power network through photovoltaic DC-to-AC converter, it is impossible to which it is inverse to flow into photovoltaic from power network Become device.
2）It is less efficient using the solar energy electricity system of this photovoltaic DC-to-AC converter.The purpose master that solar battery array generates electricity It is supplied to electricity consumption load system to use, and its electricity passed through DC/AC inversion grid connection module inversion telegram in reply nets before this, added Inversion consumption.It is furthermore whole so as to add with electric loading from public electric wire net power taking, it is necessary to be rectified into direct current through AC/DC modules Stream loss, in addition, because conductor overheating adds heating loss when energy flows in power network.
3）Photovoltaic DC-to-AC converter can not directly connect and use electric loading.Due to the moment power output climate of solar battery array Have a great influence, when moment, which occurs, in power output to be fallen, can cause device occur with electric loading to burn out or various abnormal protections.
4）Under utility network powering-off state, it can not be run with electric loading.If utility network powers off, photovoltaic DC-to-AC converter is necessary Its connection with utility network is cut off, otherwise from the electric energy of solar panel input, after net is wired back in photovoltaic DC-to-AC converter inversion The potential safety hazard got an electric shock can be caused.Therefore, electric operation can not also be obtained with electric loading.
5）From public electric wire net power taking be alternating current with electric loading, it is changed by 50/60HZ frequencies, direction have it is positive and negative it Point, fast-changing alternating current can bring electromagnetic interference（Radiation, conduction）The problems such as, to itself and other electrical equipments Service behaviour brings certain influence.
For the problem of photovoltaic hair electric system energy flow direction is single in correlation technique, not yet propose at present effective Solution.
The content of the invention
It is a primary object of the present invention to provide a kind of current transformer, photovoltaic hair electric system and its control method, to solve The problem of photovoltaic hair electric system energy flow direction is single in the prior art.
To achieve these goals, according to the first aspect of the invention, there is provided a kind of current transformer.
Included according to the current transformer of the present invention：Boost module, for connecting solar battery array；The grid-connected mould of commutation inversion Block, for connecting utility network；Current transformer dc bus, it is connected between boost module and the grid-connected module of commutation inversion, wherein, There is bus interface, the load DC bus for connection electric loading on current transformer dc bus；And controller, with boosting Module is connected with the grid-connected module of commutation inversion, for controlling the power output of solar battery array by boost module, And the grid-connected module of commutation inversion is controlled to be in inverter mode or rectification state.
Further, current transformer also includes：Power supply module, input are connected to current transformer dc bus, and output end is with rising Die block is connected with the grid-connected module of commutation inversion.
Further, current transformer also includes：Circuit is detected, is connected with current transformer dc bus, load DC bus, For detecting the power output of solar battery array and the consumption power with electric loading, wherein, controller is with detecting circuit phase Connection, for the size according to power output and consumption power, the control grid-connected module of commutation inversion is in inverter mode or rectification State.
Further, the grid-connected module of commutation inversion includes intelligent power module, and controller includes：First adder, just Phase input receives the voltage reference value of current transformer dc bus, and inverting input receives the real-time voltage of current transformer dc bus Value；First adjuster, input are connected with the output end of first adder, for voltage reference value and real-time voltage value Difference carries out PID regulation, obtains value and power reference；First multiplier, first input end are defeated with the first adjuster Go out end to be connected, the second input is used to receive the real-time phase voltage value from utility network, for by value and power reference and reality When phase voltage value handled, obtain phase-current reference value；The output end of second adder, normal phase input end and the first multiplier It is connected, inverting input receives the real-time phase current values from utility network；Second adjuster, input and second adder Output end be connected, for the difference of phase-current reference value and real-time phase current values to be carried out into PID regulation；The Three adders, the first normal phase input end are connected with the output end of the second adjuster, and the second normal phase input end is used to receive in real time Phase voltage value；Converter, it is connected with the output end of the 3rd adder, for becoming to the output result of the 3rd adder Change, obtain the phase voltage reference value of real-time phase voltage；And first comparator, first input end are connected with the output end of converter Connect, the second input is used to receive default carrier wave, and output end is connected with intelligent power module, for producing intelligent power Module I PM control signal.
Further, the grid-connected module of commutation inversion includes intelligent power module, and controller includes：4th adder, just Phase input receives the voltage reference value of current transformer dc bus, and inverting input receives the real-time voltage of current transformer dc bus Value；3rd adjuster, input are connected with the output end of the 4th adder, for voltage reference value and real-time voltage value Difference carries out proportional integration regulation, obtains value and power reference；Second multiplier, first input end received output power and consumption work( The difference of rate, the second input are connected with the output end of the 3rd adjuster, and the 3rd input receives the reality from utility network When phase voltage value, for output current phase reference value；Fifth adder, normal phase input end are connected with the output end of the second multiplier Connect, inverting input receives the real-time phase current values from utility network；4th adjuster, the output end phase with fifth adder Connection, for the difference of phase-current reference value and real-time phase current values to be carried out into proportional integration regulation；And second comparator, One input is connected with the output end of the 4th adjuster, and the second input is used to receive default carrier wave, output end and intelligent work( Rate module I PM is connected, for producing the control signal of intelligent power module.
Further, boost module includes device for power switching, wherein, controller is by controlling leading for device for power switching Logical or shut-off duration, control the power output of solar battery array.
Further, current transformer also includes：First wave filter, is connected between solar battery array and boost module； And/or second wave filter, it is connected between utility network and the grid-connected module of commutation inversion.
Further, the first wave filter is electromagnetic interface filter, and the second wave filter is LCL filter.
Further, current transformer also includes：Refrigerating module, for being radiated to current transformer.
To achieve these goals, according to the second aspect of the invention, there is provided a kind of photovoltaic hair electric system.
Included according to the photovoltaic hair electric system of the present invention：Solar battery array；Current transformer, it is connected to solar cell Between array and utility network, and with current transformer dc bus, the boost module that is connected by current transformer dc bus and The grid-connected module of commutation inversion and the controller being connected with boost module and the grid-connected module of commutation inversion, wherein, controller For adjusting the power output of solar battery array by boost module, and the grid-connected module of commutation inversion is controlled to be in inversion shape State or rectification state；Load DC bus, it is connected to current transformer dc bus；And with electric loading, with load DC bus phase Connection.
Further, photovoltaic hair electric system also includes：Joining unit, be connected to solar battery array and current transformer it Between.
Further, current transformer includes outage detection module, wherein, detect that utility network powers off in outage detection module In the case of, the connection between current transformer cut-out and utility network.
Further, the quantity of current transformer is multiple, and multiple current transformers include main convertor and from current transformer, main convertor It is connected with from current transformer by CAN, and is connected with controller.
To achieve these goals, according to the third aspect of the invention we, there is provided a kind of control of photovoltaic hair electric system Method.
Wherein, photovoltaic hair electric system includes solar battery array, utility network, with electric loading and is connected to solar energy Current transformer between array and utility network, current transformer have the grid-connected module of commutation inversion, are sent out according to the photovoltaic of the present invention The control method of electricity system includes：The power output of solar battery array is obtained, and obtains the consumption power with electric loading； Compare power output with consuming the size of power；In the case where comparing power output and being less than consumption power, control rectification is inverse Become grid-connected module and work in rectification state；And in the case where comparing power output and being more than consumption power, control rectification is inverse Become grid-connected module and work in inverter mode.
Further, current transformer also has boost module, and boost module includes device for power switching, wherein, control method Also include：By controlling the on or off duration of device for power switching, the power output of solar battery array is controlled.
Further, the control signal of the on or off duration of control device for power switching is determined in the following manner： Detect the actual voltage value of solar battery array；Calculate the voltage difference of reference voltage level and actual voltage value；To voltage difference Value carries out proportional integration computing, obtains reference current value；Detect the actual current value of solar battery array；Calculate reference current The current differential of value and actual current value；And proportional integration computing is carried out to current differential, obtain control signal.
Further, control method also includes：Current transformer is radiated.
Further, current transformer is radiated using at least one of the following type of cooling type of cooling：It is air-cooled cold But mode, cooling by water mode and the cold type of cooling of fluorine.
Further, current transformer also has current transformer dc bus, and it is grid-connected to produce control commutation inversion in the following manner Module works in the control signal of rectification state：Obtain the voltage reference value and real-time voltage value of current transformer dc bus；To electricity Press the difference of reference value and real-time voltage value to carry out PID regulation, obtain value and power reference；By value and power reference with Real-time phase voltage value from utility network handles to obtain phase-current reference value through multiplier；By phase-current reference value with coming from public affairs PID regulation is carried out with the difference of the real-time phase current values of power network, obtains phase voltage reference value；Phase voltage is referred to Value carries out sinusoidal pulse width modulation and obtains the first modulation-demodulation signal, and the first modulation-demodulation signal is the control grid-connected module of commutation inversion Work in the control signal of rectification state.
Further, current transformer also has current transformer dc bus, and it is grid-connected to produce control commutation inversion in the following manner Module works in the control signal of inverter mode：Obtain the voltage reference value and real-time voltage value of current transformer dc bus；To electricity Press the difference of reference value and real-time voltage value to carry out proportional integration regulation, obtain value and power reference；By power output and consumption work( Difference, value and power reference and the real-time phase voltage value from utility network of rate are handled through multiplier, obtain phase-current reference value； The difference of phase-current reference value and the real-time phase current values from utility network is subjected to proportional integration regulation, obtains phase voltage ginseng Examine value；And sinusoidal pulse width modulation is carried out to phase voltage reference value and obtains the second modulation-demodulation signal, the second modulation-demodulation signal The control signal of inverter mode is worked in for the grid-connected module of commutation inversion.
The present invention is using the current transformer with following structure：Boost module, for connecting solar battery array；Rectification is inverse Become grid-connected module, for connecting utility network；Current transformer dc bus, be connected to boost module and the grid-connected module of commutation inversion it Between；And controller, it is connected with boost module and the grid-connected module of commutation inversion, for controlling solar energy by boost module The power output of array, and control the grid-connected module of commutation inversion to be in inverter mode or rectification state.Pass through the present invention, solution Determine the problem of photovoltaic hair electric system energy flow direction is single in the prior art, realized control energy in current transformer and electricity Two-way flow between net, and reached the effect for ensureing that electricity consumption is supported on normal operation in the case of grid cut-off.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram according to the photovoltaic hair electric system of correlation technique；
Fig. 2 is the structural representation of current transformer according to embodiments of the present invention；
Fig. 3 is the circuit diagram of the grid-connected module of commutation inversion in current transformer according to embodiments of the present invention；
Fig. 4 is the schematic diagram that full-controlled rectifier double-closed-loop control is carried out to the grid-connected module of commutation inversion in Fig. 3；
Fig. 5 is the schematic diagram that inversion grid connection double -loop control is carried out to the grid-connected module of commutation inversion in Fig. 3；
Fig. 6 is the topological diagram of power supply module in current transformer according to embodiments of the present invention；
Fig. 7 is the structural representation of current transformer according to the preferred embodiment of the invention；
Fig. 8 is the circuit diagram of boost module in current transformer according to embodiments of the present invention；
Fig. 9 is the structural representation of photovoltaic hair electric system according to the preferred embodiment of the invention；
Figure 10 is that refrigerating module 210 uses air-cooled cooling side in photovoltaic hair electric system according to the preferred embodiment of the invention The schematic diagram that formula is radiated to current transformer；
Figure 11 is the schematic diagram of photovoltaic hair electric system according to embodiments of the present invention；
Figure 12 is the schematic diagram that multiple current transformers are in parallel in photovoltaic hair electric system according to the preferred embodiment of the invention；
Figure 13 is the flow chart of the control method of photovoltaic hair electric system according to embodiments of the present invention；
Figure 14 is the control method of photovoltaic hair electric system according to embodiments of the present invention, and solar battery array output is special The curve synoptic diagram of property；And
Figure 15 is the control method of photovoltaic hair electric system according to embodiments of the present invention, and solar battery array is carried out The schematic diagram of double-closed-loop control.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The embodiments of the invention provide a kind of current transformer, the current transformer provided below the embodiment of the present invention carries out specific Introduce：
Fig. 2 is the structural representation of current transformer according to embodiments of the present invention, as shown in Fig. 2 the current transformer 20 mainly wraps Include current transformer dc bus 23, the boost module 25 being connected by current transformer dc bus 23 and the grid-connected module of commutation inversion 26 and the controller 24 that is connected with boost module 25 and the grid-connected module 26 of commutation inversion, wherein, boost module 25 is used for Solar battery array is connected, the grid-connected module 26 of commutation inversion is used to connect utility network, and boost module 25 can be BOOST liters Die block, controller 24 is used for the power output that solar battery array is adjusted by boost module 25, and controls commutation inversion Grid-connected module 26 is in inverter mode or rectification state, has bus interface on current transformer dc bus 23, with electric loading 40 Load DC bus 50 is connected to current transformer dc bus 23 by bus interface.
The current transformer that the embodiment of the present invention is provided, by setting the grid-connected module 26 of commutation inversion, work as solar array The power output of row, during less than with the consumption power of electric loading 40, whole solar powers are used for the consumption with electric loading 40, and And controller 24 control the grid-connected module 26 of commutation inversion work in rectification state so that insufficient energy part by current transformer 20 from Utility network is supplied.When solar battery array does not generate electricity, it is whole that controller 24 controls the grid-connected module 26 of commutation inversion to work in Stream mode, with electric loading 40 all using utility source.When the power output of solar battery array, equal to using electric loading During 40 consumption power, whole solar powers are used for the consumption with electric loading 40.When the power output of solar battery array, During more than with the consumption power of electric loading 40, part solar power is used for satisfaction and consumed with the whole of electric loading 40, controller The 24 control grid-connected modules 26 of commutation inversion work in inverter mode so that the redundance of solar power is by the inversion of current transformer 20 Return utility network.Also, due to, directly by load DC bus 50, being connected to current transformer dc bus 23 with electric loading 40, So, in the case where utility network powers off, energy can be obtained by current transformer dc bus 23 with electric loading 40, realizes and use Electric loading remains able to normal operation in the case of grid cut-off.
From the above, it can be seen that the current transformer that the embodiment of the present invention is provided, solves photovoltaic hair in the prior art The problem of electricity system energy flow direction is single, two-way flow of the control energy between current transformer and power network is realized, and The effect for ensureing that electricity consumption is supported on normal operation in the case of grid cut-off is reached.
Fig. 3 is the physical circuit figure of the grid-connected module 26 of commutation inversion, as shown in figure 3, the grid-connected module 26 of commutation inversion is whole Inversion two-way circuit is flowed, mainly including SPM（Intelligent Power Module, abbreviation IPM）, energy storage electricity Sense and filter inductance L1, L2 and L3, storage capacitor C1 and C2, equalizing resistance R1 and R2 etc., wherein, SITo carry out current detecting Current sensor, SPM（IPM）For a three phase full bridge power device, it is divided into six units, each unit is by exhausted Edge grid bipolar transistor（Insulated Gate Bipolar Transistor, abbreviation IGBT）Combined with diodes in parallel Form.It mainly has two kinds of mode of operations：Rectification and inversion, determined by controller 24, SPM（IPM）Control Signal PWM1-PWM6 is produced by controller 24.
When Fig. 3 circuits work in full-controlled rectifier pattern, energy flows into photovoltaic converter by power network.Its circuit structure is three The booster circuit on road, operation principle are：By taking R phases as an example, when IGBT Q2 are turned on, electric current, through energy storage inductor L1, flows into from R phases Q2, D4 or D6 is flowed through, reach S-phase or T-phase and its energy storage inductor L2 or L3, during Q2 is turned on, on energy storage inductor L1 electric currents Rise, store energy；When Q2 is turned off, the energy for being stored in energy storage inductor L1 is flowed on current transformer dc bus through diode D1 Electric capacity, so as to realize that energy flows into photovoltaic converter by power network.
Under full-controlled rectifier pattern, it is necessary to which regulation three-phase phase current Ix (x=r, s, t) waveform phase follows mutually electricity in real time Vx (x=r, s, t) waveform phase is pressed, so as to improve power factor, reduces harmonic components and content.Its control method is using double Closed-loop control, outer shroud are Voltage loops, and major control current transformer DC bus-bar voltage is fixed value VDC_REF；Inner ring is electric current loop, The value and power reference and actual phase voltage Vx (x=r, s, t) that its reference value Ir_REF is exported by outer voltage through PID control are passed through Obtained after multiplier, the difference of current reference value and actually detected value carries out PID control, its output result and actual phase voltage Vx (x=r, s, t) obtains the reference value VPWM_X (x=r, s, t) of each phase phase voltage after conversion after being added, then adjusted using SPWM Method processed, VPWM_X (x=r, s, t) is made comparisons with triangular carrier, produce control IGBT pwm signal.For each phase Speech, upper and lower bridge arm IGBT pwm signal is complementary, i.e., can not simultaneously turn on.By taking R phases as an example, controller 24 in Fig. 4 by showing The concrete structure gone out carries out double-closed-loop control to above-mentioned full-controlled rectifier pattern, adds as shown in figure 4, controller 24 mainly includes first Musical instruments used in a Buddhist or Taoist mass 2401, the first adjuster 2402, the first multiplier 2403, second adder 2404, the second adjuster 2405, the 3rd addition Device 2406, converter 2407 and first comparator 2408, specifically：
The normal phase input end of first adder 2401 receives the voltage reference value of current transformer dc bus 23, inverting input Receive the real-time voltage value of current transformer dc bus 23.The input of first adjuster 2402 and the output of first adder 2401 End is connected, and for carrying out PID regulation to the difference of voltage reference value and real-time voltage value, obtains power reference Value.The first input end of first multiplier 2403 is connected with the output end of the first adjuster 2402, and the second input is used to connect The real-time phase voltage value from utility network is received, for value and power reference and real-time phase voltage value to be handled, obtains mutually electricity Flow reference value.The normal phase input end of second adder 2404 is connected with the output end of the first multiplier 2403, inverting input Receive the real-time phase current values from utility network.The input of second adjuster 2405 and the output end of second adder 2404 It is connected, for the difference of phase-current reference value and real-time phase current values to be carried out into PID regulation.3rd adder 2406 the first normal phase input end is connected with the output end of the second adjuster 2405, and the second normal phase input end is used to receive in real time Phase voltage value.Converter 2407 is connected with the output end of the 3rd adder 2406, for the output to the 3rd adder 2406 As a result enter line translation, obtain the phase voltage reference value of real-time phase voltage.The first input end and converter of first comparator 2408 2407 output end is connected, and the second input is used to receive default carrier wave, and output end is connected with intelligent power module, For producing the control signal of intelligent power module.
When Fig. 3 circuits work in inversion grid connection pattern, energy flows into power network by current transformer.Its operation principle is：Due to Current transformer is connected with line voltage, and its output voltage is determined by line voltage, therefore the only electric current of control input power network, to reach To the purpose toward power network input power；Meanwhile the current harmonic content for inputting power network has to comply with Standard, it is therefore necessary to same When detect line voltage phase, with ensure input power network electric current reach and line voltage with frequency with phase requirement.
Use double -loop control under inversion grid connection pattern, outer shroud is Voltage loop, major control current transformer DC bus-bar voltage For fixed value VDC_REF and line voltage need to be higher than；Inner ring is electric current loop, and its reference value is by outer voltage and voltage
Phaselocked loop gives, and by carrying out PI controls to the difference of current inner loop reference value and actually detected value, obtains photovoltaic Reference value of the current transformer per phase output voltage Ux (x=a, b, c), then using SPWM modulator approaches, by Ux (x=a, b, c) and three Angle carrier wave is made comparisons, and produces control IGBT pwm signal.For each phase, upper and lower bridge arm IGBT pwm signal is complementary , i.e., it can not simultaneously turn on.PLL phaselocked loops are mainly for detection of each phase voltage phase, to reach the electricity of control input power network Stream reaches with line voltage with the same phase of frequency.By taking R phases as an example, controller 24 is by the concrete structure that is shown in Fig. 5 to above-mentioned inversion Grid-connect mode carry out double -loop control, as shown in figure 5, controller 24 mainly include the 4th adder 2409, the 3rd adjuster 2410, Second multiplier 2411, fifth adder 2412, the 4th adjuster 2413 and the second comparator 2414, specifically：4th addition The normal phase input end of device 2409 receives the voltage reference value of current transformer dc bus 23, and it is female that inverting input receives current transformer direct current The real-time voltage value of line 23.The input of 3rd adjuster 2410 is connected with the output end of the 4th adder 2409, for pair The difference of voltage reference value and real-time voltage value carries out proportional integration regulation, obtains value and power reference.Second multiplier 2411 The difference of first input end received output power and consumption power, the second input are connected with the output end of the 3rd adjuster 2410 Connect, the 3rd input receives the real-time phase voltage value from utility network, for output current phase reference value.Fifth adder 2412 normal phase input end is connected with the output end of the second multiplier 2411, and inverting input receives the reality from utility network When phase current values.4th adjuster 2413 is connected with the output end of fifth adder 2412, for by phase-current reference value with The difference of real-time phase current values carries out proportional integration regulation.The first input end and the 4th adjuster 2413 of second comparator 2414 Output end be connected, the second input be used for receive default carrier wave, output end is connected with intelligent power module, is used for Produce the control signal of intelligent power module.
Further, current transformer 20 also includes power supply module 27, and it is straight that the input of the power supply module 27 is connected to current transformer Bus 23 is flowed, output end is connected with boost module 25 and the grid-connected module 26 of commutation inversion.In embodiments of the present invention, power Module 27 is DC/DC high-voltage switch power supply, the predominantly grid-connected module 26 of boost module 25, commutation inversion and controller 24 The DC supply of low pressure is provided, the normal operation for each module provides electric power support.In embodiments of the present invention, power supply mould The principle of block 27 is inverse-excitation type switch power-supply, is isolated between primary and secondary by switch transformer U, is led in primary switch pipe Q8 During logical, energy storage in switch transformer U primary, during switching tube Q8 is turned off, energy is primary from switch transformer U It is delivered to secondary.The topological diagram of power supply module 27 figure 6 illustrates.
Further, as shown in fig. 7, current transformer 20 also includes detection circuit 211, the detection circuit 211 and current transformer are straight Stream bus 23, load DC bus 50 are connected, for detecting the power output of solar battery array and with electric loading 40 Consumption power,
Wherein, circuit 211 is detected mainly by detecting the output voltage Vpv and electric current Ipv of solar battery array, is calculated The power output Ppv of sunny energy array, by the DC voltage VDC and DC current that detect load DC bus 50 IDC, calculate the consumption power P with electric loading 40Load, wherein, controller 24 is connected with detection circuit 211, for according to defeated Go out power and consume the size of power, the control grid-connected module 26 of commutation inversion is in inverter mode or rectification state, specifically, false If △ P=Ppv-PLoad, then：
1. as △ P=0, the power output of solar battery array is completely used for load consumption, the grid-connected module of commutation inversion 26 work in holding state；
2. as △ P>When 0, the power output of solar battery array is more than load consumption, and excess energy can feedback public power Net, the control grid-connected module 26 of commutation inversion run on inversion grid connection（DC/AC）State；
3. as △ P<When 0, the power output of solar battery array is less than load consumption, and insufficient energy part is by public power Net is supplied, and the control grid-connected module 26 of commutation inversion runs on full-controlled rectifier（AC/DC）State.
Circuit is detected by setting, to the output voltage Vpv and electric current Ipv of solar battery array, load DC bus 50 DC voltage VDC and DC current IDC detection, realize not lead in current transformer and with data are established between electric loading Letter, you can contrast the power output of solar battery array and the consumption power with electric loading.
Further, boost module 25 includes device for power switching Q7, wherein, controller 24 is by controlling power switch device Part Q7 on or off duration, the power output of solar battery array is controlled, device for power switching Q7 is controlled Control signal is produced by controller 24, and controller 24 passes through pulsewidth modulation（Pulse-Width Modulation, abbreviation PWM）Letter Number control BOOST boost modules in device for power switching Q7, to control the power output of solar battery array.Solar-electricity The direct current of pond array output, is directly inputted to current transformer dc bus 23 after BOOST boost modules.
Fig. 8 be the embodiment of the present invention used by Boost boost modules circuit diagram, as shown in figure 8, Boost boost mould Block includes energy storage inductor L7, diode D7, device for power switching Q7 and storage capacitor C7, and its operation principle is to work as power switch device When part Q7 is turned on, energy storage inductor L7 electric currents increase, because inductance has the characteristic that electric current can not be mutated, in device for power switching Q7 During shut-off, caused voltage adds the output voltage of solar battery array on energy storage inductor L7, past by diode D7 Charged on storage capacitor C7, so as to which the output energy of solar battery array is gone on current transformer dc bus 23.
Preferably, as shown in figure 9, current transformer 20 also includes the first wave filter 28 and/or the second wave filter 29, wherein, the One wave filter 28 is connected between solar battery array and boost module 25, for being entered to filtering out solar battery array The electromagnetic interference of current transformer 20.Second wave filter 29 is connected between utility network and the grid-connected module 26 of commutation inversion, for filtering Except utility network enters the electromagnetic interference of current transformer 20, the higher hamonic wave in the grid-connected current of current transformer 20 is also filtered out.Specifically, exist In the embodiment of the present invention, the first wave filter 28 can be electromagnetic interface filter, and the second wave filter 29 can be LCL filter.
By setting wave filter in current transformer, electromagnetic interference and higher hamonic wave are filtered out, reached raising unsteady flow The effect of device service behaviour.
Preferably, current transformer 20 also includes refrigerating module 210, for being radiated to current transformer 20, specifically, the cooling Any or any combination the type of cooling such as air-cooled, water cooling, fluorine can be used cold of module 210, cooling is carried out to current transformer. Figure 10 is the schematic diagram that refrigerating module 210 is radiated using the air-cooled type of cooling to current transformer, wherein, M represents radiator fan.
By setting refrigerating module to radiate current transformer, mainly to the power device in current transformer 20（Including IGBT and IPM modules etc.）Radiated, improve the reliability of current transformer.
The embodiment of the present invention additionally provides a kind of photovoltaic hair electric system, and Figure 11 is photovoltaic hair according to embodiments of the present invention The schematic diagram of electricity system, as shown in figure 11, the photovoltaic hair electric system mainly include solar battery array 10, current transformer 20th, with electric loading 40 and load DC bus 50, wherein, any unsteady flow that current transformer 20 is provided by the above of the present invention Device.
The photovoltaic hair electric system that the embodiment of the present invention is provided, by using the change with the grid-connected module 26 of commutation inversion Device 20 is flowed, when the power output of solar battery array 10, during less than with the consumption power of electric loading 40, whole solar powers For the consumption with electric loading 40, and controller 24 controls the grid-connected module 26 of commutation inversion to work in rectification state, so that not Supplied by current transformer 20 from utility network 30 sufficient energy part.When solar battery array 10 does not generate electricity, controller 24 is controlled The grid-connected module 26 of commutation inversion processed works in rectification state, with electric loading 40 all using the power supply of utility network 30.Work as solar energy The power output of array 10, during equal to the consumption power of electric loading 40, whole solar powers electric loading 40 Consumption.When the power output of solar battery array 10, during more than with the consumption power of electric loading 40, part solar power Consumed for satisfaction with the whole of electric loading 40, controller 24 controls the grid-connected module 26 of commutation inversion to work in inverter mode, makes The redundance for obtaining solar power returns utility network 30 by the inversion of current transformer 20.Also, due to directly being passed through with electric loading 40 Load DC bus 50, current transformer dc bus 23 is connected to, so, in the case where utility network powers off, with electric loading 40 Energy can be obtained by current transformer dc bus 23, realize that electricity consumption remains able to normally transport in the case of being supported on grid cut-off OK.
From the above, it can be seen that the photovoltaic hair electric system that the embodiment of the present invention is provided, solves prior art The problem of middle photovoltaic hair electric system energy flow direction is single, it is two-way between current transformer and power network to realize control energy Flowing, and reached the effect for ensureing that electricity consumption is supported on normal operation in the case of grid cut-off.
Also, due to being directly connected to current transformer with electric loading, the loss of DC/AC inversion grid connections, the AC/DC for reducing centre are whole Power device heating loss in stream loss and current transformer 20 etc., whole photovoltaic hair electric system has higher efficiency.
Preferably, the current transformer 20 in photovoltaic hair electric system also includes outage detection module, wherein, in outage detection mould In the case that block detects that utility network 30 powers off, current transformer 20 cuts off the connection between utility network 30.
By setting outage detection module, when detecting grid cut-off, the company of two way convertor and power network is cut off at once Connecing, reached the effect for ensuring power grid security, under such a state, the grid-connected module of commutation inversion enters resting state, meanwhile, pass through Boost module, ensure that the power output of solar battery array is completely used for electricity consumption load consumption, whole system runs on off-network State.
In addition, photovoltaic hair electric system also includes confluence module 60, the confluence module 60 is connected to solar battery array Between 10 and current transformer 20.Converged for the output energy to solar battery array 10, and by the output energy after convergence Amount is sent to current transformer 20.
Preferably, in embodiments of the present invention, the quantity of current transformer 20 can be multiple, any one in multiple current transformers The concrete structure and function of current transformer, it is same with the concrete structure and function phase of the current transformer of above-mentioned introduction.Multiple current transformers point Connected for main convertor and from current transformer, main convertor and between current transformer by CAN, carry out data exchange, and Multiple current transformers are connected with controller 24, cooperate under the control of controller 24.Figure 12 is the company of multiple current transformers Schematic diagram is connect, the quantity that current transformer is diagrammatically illustrated in Figure 12 is 4, wherein, 201 represent main convertor, and 202 to 204 represent Data exchange is carried out by CAN from current transformer, main convertor and between current transformer, main convertor is received from current transformer Order simultaneously returned data.Master/slave current transformer identity difference is realized by the toggle switch of four, at most can be achieved 16 simultaneously Connection.Main convertor code name is：0000, other code names are from current transformer.
By the way that the quantity of current transformer is arranged into multiple, multiple current transformers can be subjected to parallel connection, to the work(of current transformer Rate is extended, so that current transformer can be applied to the use electric loading of higher power consumption, has reached raising photovoltaic hair electricity system The versatility of system.
The embodiment of the present invention additionally provides a kind of control method of photovoltaic hair electric system, and the control method is mainly to this Any photovoltaic hair electric system that inventive embodiments the above is provided is controlled, and such a photovoltaic hair electric system includes Solar battery array, utility network, with electric loading and the current transformer being connected between solar battery array and utility network, Wherein, current transformer has the grid-connected module of commutation inversion, the control of the photovoltaic hair electric system provided below the embodiment of the present invention Method processed is specifically introduced：
Figure 13 is the flow chart of the control method of photovoltaic hair electric system according to embodiments of the present invention, as shown in figure 13, The control method mainly comprises the following steps S1 to step S7：
S1：Obtain the power output P of solar battery arraypv, and obtain the consumption power P with electric loadingLoad。
S3：Compare power output PpvWith consuming power PLoadSize.
S5：Comparing power output PpvLess than consumption power PLoadIn the case of, the grid-connected module work of control commutation inversion In rectification state.
S7：Comparing power output PpvMore than consumption power PLoadIn the case of, the grid-connected module work of control commutation inversion In inverter mode.
Pass through the power output P to solar battery arraypvWith the consumption power P with electric loadingLoadIt is compared, and In the case that the power output of solar battery array is relatively small, the control grid-connected module of commutation inversion works in rectification state, To obtain energy supplement from utility network using electric loading.In the case where power output is relatively large, control commutation inversion is simultaneously Net module works in inverter mode so that the redundance of solar power returns utility network by current transformer inversion, it can be seen that The control method for the photovoltaic hair electric system that the embodiment of the present invention is provided, solves photovoltaic hair electric system energy in the prior art The problem of flow direction is single is measured, realizes two-way flow of the control energy between current transformer and power network, and reached guarantee Electricity consumption is supported on the effect of normal operation in the case of grid cut-off.
Wherein, current transformer also has boost module, and boost module includes device for power switching, the control of the embodiment of the present invention Method also includes：By controlling the on or off duration of device for power switching, the power output of solar battery array is controlled. That is, by controlling the on or off duration of device for power switching, to realize the maximum power tracing to solar panel （MPPT）.
Further, for solar battery array, its output characteristics is mainly influenceed by intensity of illumination and temperature, In the timing of intensity of illumination one, its characteristic area line is basically unchanged, and such as the curve l1 and curve l2 in Figure 14, corresponds to different light respectively According to intensity.
Such as characteristic curve l1, when solar panel output current Ipv is zero, output voltage is up to Vo, referred to as opens Road voltage；When solar panel output voltage Vpv is zero, output current is up to Io, abbreviation open-circuit current；Work as solar energy When cell panel output voltage is Vpv=Um, output current is Ipv=Im, power output Ppv=Pm is maximum.When solar panel is defeated Go out that voltage is Vpv=U1, output current is when being Ipv=I1, power output is Ppv=P1<Pm.Therefore, can be by controlling solar energy Cell panel output voltage is Um, to realize maximum power tracing of the control boost module to solar panel（MPPT）, specifically Ground, by the double circle controling mode shown in Figure 15, to determine to control the control of the on or off duration of device for power switching Signal processed, as shown in figure 15, in double circle controling mode, outer shroud is Voltage loop, controls solar battery array output voltage, Wherein, Vpv*For reference voltage level, reference voltage level Vpv*Controlled with the actually detected actual voltage value Vpv arrived difference by PI The reference current value Ipv of electric current loop is obtained after device processed*, i.e. by detecting the actual voltage value of solar battery array, calculate ginseng The voltage difference of magnitude of voltage and actual voltage value is examined, proportional integration computing is carried out to voltage difference, obtains reference current value；Inner ring For electric current loop, reference current value Ipv*With realizing that the actual current value Ipv detected difference obtains work(after PI controllers Rate switching device Q7 control signal PWM7, i.e. by detecting the actual current value of solar battery array, calculate reference current The current differential of value and actual current value, proportional integration computing is carried out to current differential, obtains control signal.
Preferably, the control method of the embodiment of the present invention also includes：Current transformer is radiated.Specifically, can use Any one type of cooling in the air-cooled type of cooling, cooling by water mode and the cold type of cooling of fluorine, or using any combination The type of cooling current transformer is radiated：
By setting refrigerating module to radiate current transformer, reduce because of hair caused by the heating of current transformer power device Thermal losses, improve the efficiency of photovoltaic hair electric system.
Further, current transformer also has current transformer dc bus, in embodiments of the present invention, mainly using two close cycles The control control grid-connected module of commutation inversion works in rectification state, wherein, it is grid-connected that control commutation inversion is produced in the following manner Module works in the control signal of rectification state：Obtain the voltage reference value and real-time voltage value of current transformer dc bus；To electricity Press the difference of reference value and real-time voltage value to carry out PID regulation, obtain value and power reference；By value and power reference with Real-time phase voltage value from utility network handles to obtain phase-current reference value through multiplier；By phase-current reference value with coming from public affairs PID regulation is carried out with the difference of the real-time phase current values of power network, obtains phase voltage reference value；Phase voltage is referred to Value carries out sinusoidal pulse width modulation and obtains the first modulation-demodulation signal, and the first modulation-demodulation signal is the control grid-connected module of commutation inversion Work in the control signal of rectification state.
Inverter mode is mainly worked in using the double -loop control control grid-connected module of commutation inversion, wherein, in the following manner Produce the control signal that the control grid-connected module of commutation inversion works in inverter mode：Obtain the Voltage Reference of current transformer dc bus Value and real-time voltage value；Proportional integration regulation is carried out to the difference of voltage reference value and real-time voltage value, obtains value and power reference； By power output and the consumption difference of power, value and power reference and real-time phase voltage value from utility network through multiplier at Reason, obtains phase-current reference value；The difference of phase-current reference value and the real-time phase current values from utility network is subjected to ratio Integral adjustment, obtain phase voltage reference value；And sinusoidal pulse width modulation is carried out to phase voltage reference value and obtains the second modulation /demodulation Signal, the second modulation-demodulation signal are the control signal that the grid-connected module of commutation inversion works in inverter mode.
As can be seen from the above description, it is two-way between current transformer and power network to realize control energy by the present invention Flowing, and reached the effect for ensureing that electricity consumption is supported on normal operation in the case of grid cut-off.
It should be noted that can be in such as one group of computer executable instructions the flow of accompanying drawing illustrates the step of Performed in computer system, although also, show logical order in flow charts, in some cases, can be with not The order being same as herein performs shown or described step.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored Performed in the storage device by computing device, either they are fabricated to respectively each integrated circuit modules or by they In multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific Hardware and software combines.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims (16)

  1. A kind of 1. current transformer, it is characterised in that including：
    Boost module (25), for connecting solar battery array；
    The grid-connected module of commutation inversion (26), for connecting utility network；
    Current transformer dc bus (23), it is connected between the boost module (25) and the grid-connected module of the commutation inversion (26), Wherein, there is bus interface on the current transformer dc bus (23), the load DC bus for connection electric loading；And
    Controller (24), it is connected with the boost module (25) and the grid-connected module of the commutation inversion (26), for passing through The boost module (25) controls the power output of the solar battery array, and controls the grid-connected module of the commutation inversion (26) inverter mode or rectification state are in,
    The current transformer also includes：
    Circuit (211) is detected, is connected with the current transformer dc bus (23), the load DC bus, for detecting The power output of the solar battery array and the consumption power with electric loading,
    Wherein, the controller (24) is connected with the detection circuit (211), for according to the power output and described disappearing The size of wasted work rate, the grid-connected module of the commutation inversion (26) is controlled to be in inverter mode or rectification state,
    When the power output of solar battery array, during less than with the consumption power of electric loading, whole solar powers are used The consumption of electric loading, and the controller control grid-connected module of commutation inversion works in rectification state；When solar battery array not During generating, the controller control grid-connected module of commutation inversion works in rectification state, with electric loading all using utility source； When the power output of solar battery array, during equal to the consumption power of electric loading, whole solar powers are born for electricity consumption The consumption of load；When the power output of solar battery array, during more than with the consumption power of electric loading, part solar power is used In the whole consumption of satisfaction electric loading, the controller control grid-connected module of commutation inversion works in inverter mode so that solar energy The redundance of power returns utility network by current transformer inversion,
    Wherein, the current transformer also includes：
    Power supply module (27), input are connected to the current transformer dc bus (23), output end and the boost module (25) It is connected with the grid-connected module of the commutation inversion (26),
    Wherein, the grid-connected module of the commutation inversion (26) includes intelligent power module, and the controller (24) includes：
    First adder (2401), normal phase input end receives the voltage reference value of the current transformer dc bus (23), anti-phase defeated Enter the real-time voltage value that end receives the current transformer dc bus (23)；
    First adjuster (2402), input are connected with the output end of the first adder (2401), for the electricity Press the difference of reference value and the real-time voltage value to carry out PID regulation, obtain value and power reference；
    First multiplier (2403), first input end are connected with the output end of first adjuster (2402), the second input Hold for receiving the real-time phase voltage value from the utility network, for by the value and power reference and the real-time phase voltage Value is handled, and obtains phase-current reference value；
    Second adder (2404), normal phase input end are connected with the output end of first multiplier (2403), anti-phase input End receives the real-time phase current values from the utility network；
    Second adjuster (2405), input are connected with the output end of the second adder (2404), for by the phase The difference of current reference value and the phase current values in real time carries out PID regulation；
    3rd adder (2406), the first normal phase input end are connected with the output end of second adjuster (2405), and second Normal phase input end is used to receive the real-time phase voltage value；
    Converter (2407), it is connected with the output end of the 3rd adder (2406), for the 3rd adder (2406) output result enters line translation, obtains the phase voltage reference value of the phase voltage in real time；And
    First comparator (2408), first input end are connected with the output end of the converter (2407), and the second input is used In receiving default carrier wave, output end is connected with the intelligent power module, for producing the intelligent power module Control signal,
    Wherein, the grid-connected module of the commutation inversion (26) includes intelligent power module, and the controller (24) includes：
    4th adder (2409), normal phase input end receives the voltage reference value of the current transformer dc bus (23), anti-phase defeated Enter the real-time voltage value that end receives the current transformer dc bus (23)；
    3rd adjuster (2410), input is connected with the output end of the 4th adder (2409), for the electricity Press the difference of reference value and the real-time voltage value to carry out proportional integration regulation, obtain value and power reference；
    Second multiplier (2411), first input end receive the power output and the difference of the consumption power, the second input End is connected with the output end of the 3rd adjuster (2410), and the 3rd input receives the real-time phase from the utility network Magnitude of voltage, for output current phase reference value；
    Fifth adder (2412), normal phase input end are connected with the output end of second multiplier (2411), anti-phase input End receives the real-time phase current values from the utility network；
    4th adjuster (2413), it is connected with the output end of the fifth adder (2412), for the phase current to be joined The difference for examining value and the phase current values in real time carries out proportional integration regulation；And
    Second comparator (2414), first input end are connected with the output end of the 4th adjuster (2413), the second input Hold for receiving default carrier wave, output end is connected with the intelligent power module, for producing the SPM IPM control signal.
  2. 2. current transformer according to claim 1, it is characterised in that the boost module (25) includes device for power switching (Q7), wherein, the controller (24) is by controlling the on or off duration of the device for power switching (Q7), described in control The power output of solar battery array.
  3. 3. current transformer according to claim 1, it is characterised in that the current transformer also includes：
    First wave filter (28), it is connected between the solar battery array and the boost module (25)；
    And/or
    Second wave filter (29), it is connected between the utility network and the grid-connected module of the commutation inversion (26).
  4. 4. current transformer according to claim 3, it is characterised in that first wave filter (28) is electromagnetic interface filter, described Second wave filter (29) is LCL filter.
  5. 5. current transformer according to claim 1, it is characterised in that the current transformer also includes：
    Refrigerating module (210), for being radiated to the current transformer.
  6. A kind of 6. photovoltaic hair electric system, it is characterised in that including：
    Solar battery array (10)；
    Current transformer (20), the current transformer are the current transformer described in any one of claim 1 to 5, and the current transformer is connected to institute State between solar battery array (10) and utility network (30), and there is current transformer dc bus (23), pass through the unsteady flow Boost module (25) and the grid-connected module of commutation inversion (26) that device dc bus (23) is connected and with the boost module (25) controller (24) being connected with the grid-connected module of the commutation inversion (26), wherein, the controller (24) is used to lead to Cross the boost module (25) and adjust the power output of the solar battery array, and control the grid-connected module of the commutation inversion (26) inverter mode or rectification state are in；
    Load DC bus (50), it is connected to the current transformer dc bus (23)；And
    With electric loading (40), it is connected with the load DC bus (50),
    The current transformer also includes：
    Circuit (211) is detected, is connected with the current transformer dc bus (23), the load DC bus, for detecting The power output of the solar battery array and the consumption power with electric loading,
    Wherein, the controller (24) is connected with the detection circuit (211), for according to the power output and described disappearing The size of wasted work rate, the grid-connected module of the commutation inversion (26) is controlled to be in inverter mode or rectification state,
    When the power output of solar battery array, during less than with the consumption power of electric loading, whole solar powers are used The consumption of electric loading, and the controller control grid-connected module of commutation inversion works in rectification state；When solar battery array not During generating, the controller control grid-connected module of commutation inversion works in rectification state, with electric loading all using utility source； When the power output of solar battery array, during equal to the consumption power of electric loading, whole solar powers are born for electricity consumption The consumption of load；When the power output of solar battery array, during more than with the consumption power of electric loading, part solar power is used In the whole consumption of satisfaction electric loading, the controller control grid-connected module of commutation inversion works in inverter mode so that solar energy The redundance of power returns utility network by current transformer inversion.
  7. 7. photovoltaic hair electric system according to claim 6, it is characterised in that the photovoltaic hair electric system also includes：
    Joining unit (60), it is connected between the solar battery array (10) and the current transformer (20).
  8. 8. photovoltaic hair electric system according to claim 6, it is characterised in that the current transformer (20) includes outage detection Module, wherein, in the case where the outage detection module detects the utility network (30) power-off, the current transformer (20) Connection between cut-out and the utility network (30).
  9. 9. photovoltaic hair electric system according to claim 6, it is characterised in that the quantity of the current transformer (20) is more Individual, multiple current transformers (20) include main convertor and pass through CAN from current transformer with described from current transformer, the main convertor Bus connects, and is connected with the controller (24).
  10. 10. a kind of control method of photovoltaic hair electric system, it is characterised in that the photovoltaic hair electric system includes solar-electricity Pond array, utility network, with electric loading and the current transformer being connected between the solar battery array and the utility network, Wherein, the current transformer is the current transformer described in any one of claim 1 to 5, and the current transformer has the grid-connected mould of commutation inversion Block, the current transformer also have boost module and controller, and the controller and the boost module and the commutation inversion are simultaneously Net module is connected, and for controlling the power output of the solar battery array by the boost module, and controls institute State the grid-connected module of commutation inversion and be in inverter mode or rectification state, the control method includes：
    The power output of the solar battery array is obtained, and obtains the consumption power with electric loading；
    Compare the power output and the size of the consumption power；
    In the case where comparing the power output and being less than the consumption power, the controller controls the commutation inversion simultaneously Net module works in rectification state；And
    In the case where comparing the power output and being more than the consumption power, the controller controls the commutation inversion simultaneously Net module works in inverter mode,
    When the power output of solar battery array, during less than with the consumption power of electric loading, whole solar powers are used The consumption of electric loading, and the controller control grid-connected module of commutation inversion works in rectification state；When solar battery array not During generating, the controller control grid-connected module of commutation inversion works in rectification state, with electric loading all using utility source； When the power output of solar battery array, during equal to the consumption power of electric loading, whole solar powers are born for electricity consumption The consumption of load；When the power output of solar battery array, during more than with the consumption power of electric loading, part solar power is used In the whole consumption of satisfaction electric loading, the controller control grid-connected module of commutation inversion works in inverter mode so that solar energy The redundance of power returns utility network by current transformer inversion.
  11. 11. control method according to claim 10, it is characterised in that the current transformer also has boost module, described Boost module includes device for power switching, wherein, the control method also includes：
    By controlling the on or off duration of the device for power switching, the output work of the solar battery array is controlled Rate.
  12. 12. control method according to claim 11, it is characterised in that determine to control the power to open in the following manner Close the control signal of the on or off duration of device：
    Detect the actual voltage value of the solar battery array；
    Calculate the voltage difference of reference voltage level and the actual voltage value；
    Proportional integration computing is carried out to the voltage difference, obtains reference current value；
    Detect the actual current value of the solar battery array；
    Calculate the current differential of the reference current value and the actual current value；And
    Proportional integration computing is carried out to the current differential, obtains the control signal.
  13. 13. control method according to claim 10, it is characterised in that the control method also includes：To the unsteady flow Device is radiated.
  14. 14. control method according to claim 13, it is characterised in that cold using at least one of the following type of cooling But mode radiates to the current transformer：The air-cooled type of cooling, cooling by water mode and the cold type of cooling of fluorine.
  15. 15. control method according to claim 10, it is characterised in that the current transformer also has current transformer direct current female Line, the control signal for controlling the grid-connected module of commutation inversion to work in rectification state is produced in the following manner：
    Obtain the voltage reference value and real-time voltage value of the current transformer dc bus；
    PID regulation is carried out to the difference of the voltage reference value and the real-time voltage value, obtains power reference Value；
    The value and power reference and the real-time phase voltage value from the utility network are handled through multiplier to obtain phase current ginseng Examine value；
    The difference of the phase-current reference value and the real-time phase current values from the utility network is subjected to PID Regulation, obtains phase voltage reference value；And
    Sinusoidal pulse width modulation is carried out to the phase voltage reference value and obtains the first modulation-demodulation signal, the first modulation /demodulation letter Number to control the grid-connected module of commutation inversion to work in the control signal of rectification state.
  16. 16. control method according to claim 10, it is characterised in that the current transformer also has current transformer direct current female Line, the control signal for controlling the grid-connected module of commutation inversion to work in inverter mode is produced in the following manner：
    Obtain the voltage reference value and real-time voltage value of the current transformer dc bus；
    Proportional integration regulation is carried out to the difference of the voltage reference value and the real-time voltage value, obtains value and power reference；
    By the power output and the difference of the consumption power, the value and power reference and from the real-time of the utility network Phase voltage value is handled through multiplier, obtains phase-current reference value；
    The difference of the phase-current reference value and the real-time phase current values from the utility network is subjected to proportional integration regulation, Obtain phase voltage reference value；And
    Sinusoidal pulse width modulation is carried out to the phase voltage reference value and obtains the second modulation-demodulation signal, the second modulation /demodulation letter Number work in the control signal of inverter mode for the grid-connected module of the commutation inversion.
CN201310728418.XA 2013-12-24 2013-12-24 converter, photovoltaic power generation system and control method thereof Active CN104734553B (en)

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