CN207251220U - A kind of solar energy power generating three phase full bridge grid-connected inverting system - Google Patents
A kind of solar energy power generating three phase full bridge grid-connected inverting system Download PDFInfo
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- CN207251220U CN207251220U CN201720532770.XU CN201720532770U CN207251220U CN 207251220 U CN207251220 U CN 207251220U CN 201720532770 U CN201720532770 U CN 201720532770U CN 207251220 U CN207251220 U CN 207251220U
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Abstract
The utility model discloses a kind of solar energy power generating three phase full bridge grid-connected inverting system, including solar cell, three phase full bridge grid-connected inverting system major loop, local load, power grid, three phase full bridge parallel network reverse control system, PC and machine communication interface；Three phase full bridge grid-connected inverting system major loop is connected with solar cell, local load, power grid, three phase full bridge parallel network reverse control system respectively, three phase full bridge parallel network reverse control system is connected with PC and machine communication interface, and three phase full bridge parallel network reverse control system is connected with solar cell, local load, power grid wireless；The defencive function of the utility model total system is perfect, has the advantages that circuit is simple, small, cost is low, low in energy consumption, total harmonic distortion factor is low, efficient, security reliability is high, service life is long.
Description
Technical field
The utility model belongs to new energy solar energy generation technology, Power Electronic Technique and control technology field, is related to one
Kind solar energy power generating three phase full bridge grid-connected inverting system.
Background technology
Solar energy is a kind of preferable regenerative resource, and following most development potentiality is solar energy power generating system
System, its utilization are effective ways the problems such as solving energy shortage, environmental pollution and greenhouse effects, are ideals of human being
Alternative energy source, moreover, distributed solar electricity generation system is future home electricity consumption and the development trend of commercial power, it is meeting
While oneself power demand, moreover it is possible to it is connected with main power grid, the electricity more than needed sent can be sold to Utilities Electric Co., therefore,
With the development of solar energy generation technology and the decline of photovoltaic cell cost, solar energy development utilization will become two Pius XIs
One of the important energy source in discipline later stage.
Distributed solar electricity generation system has many advantages, such as：(1), the stability and power supply matter of load supplying need not be considered
The problem of amount.（2）, photovoltaic cell can always work at maximum power point, by power grid come the whole of receiving solar energy to be sent out
Electric energy, improves the efficiency of solar power generation.（3）, directly electric energy is inputted into power grid, can make full use of what photovoltaic array was sent out
Electric power, eliminates the storage battery as energy storage link, reduces the energy loss brought by discharge and recharge, eliminates storage battery dimension
Shield, reduces the cost of system.（4）, distributed solar electricity generation system can play Peak Load Adjustment to utility network.
In distributed solar electricity generation system, the networking access system of gird-connected inverter is to realize solar energy power generating
Between main power grid carry out energy transmission with conversion key link, its power quality to main power grid, system security reliability,
System protection etc. has a direct impact, and the effect of gird-connected inverter is the output when solar photovoltaic generation system in a big way
During interior change, the matched friendship of DC conversion Cheng Yuzhu power grids that all the time can be exported solar cell with efficiency as high as possible
Galvanic electricity, and be sent into main power grid, moreover, as carrying out the grid-connected inverse of energy conversion between sun power production photovoltaic battery and main network system
Become device, the overall investment to solar photovoltaic generation system of its security, reliability, inversion efficiency, manufacture cost etc. factor and
Income has very important status, and therefore, distributed solar electricity generation system has following requirement：（1）, realize the electricity of high quality
It can change, the direct current that solar-energy photo-voltaic cell produces is converted into satisfactory single-phase or three phase sine alternating current wave, its
The harmonic requirement of electric current and voltage meets grid-connected conditions, such as clear stipulaties gird-connected inverter output waveform in external Grid-connection standards
Total harmonic wave factor should be less than 5%, each harmonic content is less than 3%, and has preferable dynamic characteristic.（2）, realize system
Demand for safety protection, as input reverse-connection protection, DC over-voltage protection, output overloading protection, output short circuit protection, exchange overvoltage
With under-voltage protection, " isolated island " protection and device autoprotection, so that it is guaranteed that the reliability of system, such as according to standard GB/T/T
19939-2005, international standard IEEE1547 and IECl727, all gird-connected inverters must have the function of anti-islanding effect,
Isolated island must quickly and accurately cut off the electric connection of gird-connected inverter and main power grid when occurring.（3）, maximum power point with
Track, maximally utilises solar cell, to improve the efficiency of inverter.（4）, for reduce solar power system into
This, effectively can popularize and use, and gird-connected inverter is needed using desirably transless scheme, so as into one
Step improves the efficiency of gird-connected inverter, substantially reduces the volume, weight and cost of solar photovoltaic generation system.
Therefore, design is a kind of meets that the small of above-mentioned technical requirements, cost are low, low in energy consumption, efficient, security reliability
High, service life length distributed solar electricity generation system is the development trend of gird-connected inverter.
The content of the invention
The purpose of this utility model is to provide a kind of solar energy power generating three phase full bridge grid-connected inverting system, it is at the same time
Possess the features such as small, cost is low, low in energy consumption, efficient, security reliability is high, service life is long, and, there is provided one kind is most
High-power tracing control MPPT, no industrial frequency transformer, the solar energy power generating three phase full bridge parallel network reverse for preventing island effect
System, to make reversals have the efficiency and security of higher, and meets standard GB/T/T 19939-2005《The sun
Can the requirement of photovoltaic system interconnection technology》.
It is grid-connected inverse that a kind of solar energy power generating three phase full bridge grid-connected inverting system includes solar cell 1, three phase full bridge
Become main loop 2, local load 31, power grid 32, three phase full bridge parallel network reverse control system 4, PC and machine communication interface 5；Three
Mutually full-bridge grid-connected inversion system major loop 2 loads 31, power grid 32, three phase full bridge parallel network reverse with solar cell 1, local respectively
Control system 4 connects, and three phase full bridge parallel network reverse control system 4 is connected with PC and machine communication interface 5, three phase full bridge parallel network reverse
Control system 4 and solar cell 1, local load 31,32 wireless connection of power grid, the PC and machine communication interface 5 be with it is upper
The communication interface of PC machine and other solar photovoltaic generation systems and machine；
Three phase full bridge grid-connected inverting system major loop 2 includes input protection switch 21, DC voltage booster circuit 22, three-phase inversion
Circuit 23, Three-phase electric-wave filter 24, three-phase grid switch 25, power grid, which network, switchs 26, and the input termination of input protection switch 21 is too
It is positive can battery 1 output terminal, input protection switch 21, DC voltage booster circuit 22, three-phase inverting circuit 23, Three-phase electric-wave filter 24,
Three-phase grid switch 25, the power grid switch that networks 26 are sequentially connected in series, and the network output terminal of switch 26 of power grid gets access to grid 32 and local negative
Carry 31 input terminal；Local load 31 connects the output terminal of three-phase grid switch 25 and power grid networking switch 26；
Three phase full bridge parallel network reverse control system 4 include touch panel controller 401, three-phase grid inverter controller 402,
Touch-screen 403, sample circuit 404, switch driving circuit 405, booster driving circuit 406, inverse changing driving circuit 407, three contraries
Change, power grid and local load frequency detection circuit 408, battery voltage detection circuit 409, battery current detection circuit 410, boosting
Voltage detecting circuit 411, three-phase inversion, power grid and local load voltage detection circuit 412, three-phase inversion, power grid and local are negative
Carry current detection circuit 413, three-phase inversion, power grid and local load phase detection circuit 414；
The touch panel controller 401 is connected on three-phase grid inverter controller 402, touch-screen 403 and PC and machine respectively
One output terminal of communication interface 5,401 output terminal of touch panel controller connect switch driving circuit 405 and boosting driving electricity respectively
One input terminal on road 406；
The output terminal of the sample circuit 404 connects touch panel controller 401 and three-phase grid inverter controller 402 respectively
An input terminal；
One input terminal of the output of the three-phase grid inverter controller 402 termination inverse changing driving circuit 407；
The input of first output termination three phase full bridge grid-connected inverting system major loop 2 of the switch driving circuit 405 is protected
Shield switch 21, the three-phase grid of the second output termination three phase full bridge grid-connected inverting system major loop 2 of switch driving circuit 405 are opened
25 are closed, the power grid of the 3rd output termination three phase full bridge grid-connected inverting system major loop 2 of switch driving circuit 405, which networks, to be switched
26；
The DC boosting electricity of the output termination three phase full bridge grid-connected inverting system major loop 2 of the booster driving circuit 406
One input terminal on road 22；
The three-phase inversion electricity of the output termination three phase full bridge grid-connected inverting system major loop 2 of the inverse changing driving circuit 407
One input terminal on road 23；
The input terminal of the sample circuit 404 connect respectively three-phase inversion, power grid and local load frequency detection circuit 408,
Battery voltage detection circuit 409, battery current detection circuit 410, boost voltage detection circuit 411, three-phase inversion, power grid and sheet
Ground load voltage detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and
The output terminal of local load phase detection circuit 414.
The input protection switch 21 includes the first controllable silicon SCR 1 and the second controllable silicon SCR 2；The DC voltage booster circuit
22 include the first inductance L1, the second inductance L2, the first diode D1, the second diode D2, the first IGBT power tubes Q1, second
IGBT power tubes Q2, the first electrolytic capacitor C1 and the second electrolytic capacitor C2；The three-phase inverting circuit 23 includes the first power tube
Q3, the second power tube Q4, the 3rd power tube Q5, the 4th power tube Q6, the 5th power tube Q7 and the 6th power tube Q8；The three-phase
Wave filter 24 includes the first inductance L3, the second inductance L4, the 3rd inductance L5, the first capacitance C3, the second capacitance C4 and the 3rd capacitance
C5；It is two-way controllable that the three-phase grid switch 25 includes the first bidirectional triode thyristor SCR3, the second bidirectional triode thyristor SCR4 and first
Silicon SCR5；It is two-way that the power grid networking switch 26 includes the first bidirectional triode thyristor SCR6, the second bidirectional triode thyristor SCR7 and the 3rd
Controllable silicon SCR 8.
First controllable silicon SCR 1 of the input protection switch 21 and the anode of the second controllable silicon SCR 2 connect the sun respectively
The cathode of the cathode and anode of energy battery 1, the first controllable silicon SCR 1 and the second controllable silicon SCR 2 connects DC voltage booster circuit respectively
One end of 22 the first inductance L1 and the second inductance L2, the first controllable silicon SCR 1 connect three-phase with the gate pole of the second controllable silicon SCR 2
One output terminal of the switch driving circuit 405 in full-bridge grid-connected inverse control system 4.
One end of the first inductance L1 and the second inductance L2 of the DC voltage booster circuit 22 connect input protection switch respectively
21 two output terminals；The anode tap of the first diode D1 connects the other end of the first inductance L1, second diode
The cathode terminal of D2 connects the other end of the second inductance L2；The collector of the first IGBT power tubes Q1 even presses the first diode D1
Anode tap, the emitter of the first IGBT power tubes Q1 connects the collector and composition N zero line sides of the 2nd IGBT power tubes Q2, the
The emitter of two IGBT power tubes Q2 connects the cathode terminal of the second diode D2, the first IGBT power tubes Q1 and the 2nd IGBT power
Booster driving circuit 406 in the gate terminal connection three phase full bridge parallel network reverse control system 4 of pipe Q2, first electrolytic capacitor
The positive terminal of C1 connects the cathode terminal of the first diode D1, and the negative pole end of the first electrolytic capacitor C1 connects the second electrolytic capacitor C2's
Positive terminal, and N zero line sides are connected, the negative pole end of the second electrolytic capacitor C2 connects the anode tap of the second diode D2, the first electrolysis
The positive terminal of capacitance C1 exports positive BUS DC voltages, and the negative pole end of the second electrolytic capacitor C2 exports negative BUS DC voltages.
The first power tube Q1, the 3rd power tube Q5 of three-phase inverting circuit 23 and the three-phase inversion of the DC voltage booster circuit 22
The cathode of the first diode D1 of DC voltage booster circuit 22 is connected after the unified connection of the collector terminal of the 5th power tube Q7 of circuit 23
End and the positive terminal of the first electrolytic capacitor C1, the transmitting of the second power tube Q4, the 4th power tube Q6 and the 6th power tube Q8
The cathode terminal of the second diode D2 and the anode of the second electrolytic capacitor C2 of DC voltage booster circuit 22 are connected after extreme unified connection
End；The emitter terminal of the first power tube Q3 connects the collector terminal of the second power tube Q4, and connects Three-phase electric-wave filter 24
One end of first inductance L3；The emitter terminal of the 3rd power tube Q5 connects the collector terminal of the 4th power tube Q6, and connects
One end of second inductance L4 of Three-phase electric-wave filter 24；The emitter terminal of the 5th power tube Q7 connects the collection of the 6th power tube Q8
Electrode tip, and connect one end of the 3rd inductance L5 of Three-phase electric-wave filter 24；The first power tube Q3, the second power tube Q4,
Three power tube Q5, the 4th power tube Q6, the 5th power tube Q7 and the 6th power tube Q8 all gate terminals connection three phase full bridge simultaneously
The output terminal of the inverse changing driving circuit 407 of net inverse control system 4.
The first inductance L3, the second inductance L4 of the Three-phase electric-wave filter 24 and the other end of the 3rd inductance L5 connect respectively
Behind one end of one capacitance C3, the second capacitance C4 and the 3rd capacitance C5, and three input terminals of three-phase grid switch 25 are connected, it is described
The other end connection power grid 32 of first capacitance C3, the second capacitance C4 and the 3rd capacitance C5 and a public N zero of local load 31
Line end.
First bidirectional triode thyristor SCR3 of three-phase grid switch 25, the second bidirectional triode thyristor SCR4 and the 3rd is two-way can
One end of control silicon SCR5 connects an output of the first inductance L1, the second inductance L2, the 3rd inductance L3 of Three-phase electric-wave filter 24 respectively
The three-phase input end of end, the local load 31 of its other end connection and power grid networking switch 26；The first bidirectional triode thyristor SCR3,
In the gate pole connection three phase full bridge parallel network reverse control system 4 of second bidirectional triode thyristor SCR4 and the 3rd bidirectional triode thyristor SCR5
Another output terminal of switch driving circuit 405.
The power grid network switch 26 the first bidirectional triode thyristor SCR6, the second bidirectional triode thyristor SCR7 and the 3rd is two-way can
One end of control silicon SCR8 connects the three-phase input end of local load 31 and the three-phase output end of three-phase grid switch 25 respectively, its is another
One end connects the three-phase input end of power grid 32；The first bidirectional triode thyristor SCR7, second bidirectional triode thyristor SCR8 and the 3rd pair
Another output of switch driving circuit 405 into the gate pole connection three phase full bridge parallel network reverse control system 4 of controllable silicon SCR 8
End.
The touch panel controller 401 and three-phase grid inverter controller 402 include advanced digital processing DSP
（TMS320LF24x）Chip, the booster driving circuit 405, inverse changing driving circuit 406 and switch driving circuit 404 include can
Programmed logic CPLD chips, an input/output terminal of the touch panel controller 401 pass through on PC and the connection of machine communication interface 5
The three phase full bridge grid-connected inverting system of position machine PC or other parallel runnings, realizes that multimachine coordinates control, the touch panel control
Device 401 monitors its peak power output according to the voltage and current of the solar cell 1, and adjusts DC voltage booster circuit accordingly
The duty cycle of drive signal, implements maximal power tracing control（MPPT）；The three-phase grid inverter controller 402 is implemented grid-connected
Control and its take over seamlessly with two kinds of operational modes of isolated network, and according to the positive negative dc voltage of DC voltage booster circuit 22, three contraries
Become the parameters such as circuit, power grid and the three-phase current locally loaded, voltage, frequency, phase, power, determine output to three-phase inversion
The high_frequency sine wave space vector pulse width modulation SVPWM control signals of circuit.
In the three phase full bridge grid-connected inverting system major loop 2, input protection switch 21 is connected too by single-phase silicon-controlled
Positive energy battery 1, it is defeated according to the touch panel controller 401 of three phase full bridge parallel network reverse control system 4 and switch driving circuit 405
Go out control signal closure or disconnect solar cell 1 and opened with inputting protection in the three phase full bridge grid-connected inverting system major loop 2
The electric connection between 21 is closed, for leaking electricity due to solar cell 1, anode（REC+）And anode（REC-）Reversely connect
When connecing, exporting low-voltage or high voltage and the failure of three phase full bridge parallel network reverse control system 4, system is protected.
The control method of above-mentioned solar energy power generating three phase full bridge grid-connected inverting system, comprises the following steps that：
Step 1：Touch panel controller 401 obtains sample circuit 404 and passes through battery voltage detection circuit 409, battery electricity
Current detection circuit 410, boost voltage detection circuit 411, three-phase inversion, power grid and local load voltage detection circuit 412, three-phase
Inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load phase detection circuit 414 and three
Phase inversion, power grid and local load frequency detection circuit 408, the voltage of the solar cell 1 collected respectively and electric current and
Its polarity, the generating positive and negative voltage of DC voltage booster circuit 22, three-phase inversion, power grid and the voltage locally loaded, electric current, phase and frequency
Rate, touch panel controller 401 are received after the sample information of sample circuit 404 by its internal digital processing DSP-
TMS320LF24x chips, GPLD chips handle to obtain three-phase inverting circuit 23, power grid 32 and local load 31 active-power P,
PL, △ P and reactive power Q, QL、△Q；
Step 2：Touch panel controller 401 passes through battery voltage detection circuit 409, battery electricity according to sample circuit 404
Current detection circuit 410, boost voltage detection circuit 411 sample voltage, electric current and the DC boosting of obtained solar panel 1
The voltage condition of circuit 22, judging the solar cell 1, whether polar signal is normal over the ground, voltage and the electricity of solar cell 1
Whether stream is normal, and whether the voltage of DC voltage booster circuit 22 is over-pressed, if all parameters are normal, touch panel controller
401 output control signals connect input protection switch 21 through switch driving circuit 405, go successively to step 3；If wherein have
Parameter is abnormal, then output control signal disconnects input protection switch 21 through switch driving circuit 405, three-phase grid switchs 25 and
Power grid, which networks, switchs 26, stops exporting the pwm control signal of boosted drive circuit 406, and notifies three-phase grid inversion control
Device 402 stops sine wave space vector pulse width modulation SVPWM signal of the output through inverse changing driving circuit 407, back to step
Rapid one；
Step 3：After 401 output control signal of touch panel controller connects input protection switch 21, solar cell 1
DC voltage access three phase full bridge grid-connected inverting system major loop 2 in, touch panel controller 401 exports boosted driving electricity
The pwm control signal on road 406 is controlled to DC voltage booster circuit 22, i.e. DC boosting, promotes the DC voltage liter of solar cell 1
Be depressed into positive negative dc voltage i.e. ± BUS voltages, go successively to step 4, wherein, DC voltage booster circuit 22 implement maximum power with
Track controls（MPPT）；
Step 4：Touch panel controller 401 is sampled according to sample circuit 404 by boost voltage detection circuit 411
The information of the DC voltage booster circuit 22 arrived, judges the positive negative dc voltage of DC voltage booster circuit 22（± BUS voltages）Whether just
In normal scope, if in normal range (NR), touch panel controller 401 notifies three-phase grid inverter controller 402 to export warp
The SVPWM control signals of inverse changing driving circuit 407, i.e. three-phase inverting circuit 23 control, and promote positive negative dc voltage to be reverse into three
Cross streams voltage, and the three-phase alternating current of the frequency of 23 output voltage of three-phase inverting circuit and electric current, phase and amplitude and power grid 32
The same frequency of electricity, same phase and constant amplitude（Voltage magnitude can have certain deviation, and such as ± 3%）, go successively to step 5；If not just
In normal scope, then 401 output control signal of touch panel controller through switch driving circuit 405 disconnect input protection switch 21,
Three-phase grid switch 25 and power grid, which network, switchs 26, stops exporting the pwm control signal of boosted drive circuit 406, and notifies
Three-phase inversion controller 402 stops SVPWM control signal of the output through inverse changing driving circuit 407, back to step 1；
Step 5：Touch panel controller 401 passes through three-phase inversion, power grid and local load electricity according to sample circuit 404
Press detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load
The sampled data of phase detecting circuit 414 and three-phase inversion, power grid and local load frequency detection circuit 408, judges three contraries
Become the parameters such as phase, the frequency of the voltage and current that circuit 23 exports whether in normal range (NR), if in normal range (NR), after
It is continuous to enter step six；If not in normal range (NR), output control signal disconnects three-phase grid through switch driving circuit 405 and opens
25 and power grid networking switch 26 are closed, and notify three-phase inversion controller 402 to stop space arrow of the output through inverse changing driving circuit 407
Pulse width modulation SVPWM control signals are measured, back to step 1；
Step 6：Touch panel controller 401 passes through three-phase inversion, power grid and local load electricity according to sample circuit 404
Press detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load
The sampled data of phase detecting circuit 414 and three-phase inversion, power grid and local load frequency detection circuit 408, judges power grid 32
Voltage, electric current, the parameter such as phase and frequency whether in normal range (NR), if in normal range (NR), output control signal
Power grid networking switch 26 is connected through switch driving circuit 405, and exports the space vector pulse duration through inverse changing driving circuit 407
Modulation SVPWM control signals make three-phase inverting circuit 23 work in PQ control models, go successively to step 7；If not normal
In the range of, then output control signal disconnects power grid networking switch 26 through switch driving circuit 405, and exports through inverse changing driving circuit
407 space vector pulse width modulation SVPWM control signals make three-phase inverting circuit 23 work in V/f control models, then
Three-phase grid switch 25 is connected, three-phase inverting circuit 23 provides electric energy by local load 31 of isolated power grid pattern, enters step
Eight；
Step 7：Touch panel controller 401 passes through three-phase inversion, power grid and local load electricity according to sample circuit 404
Press detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load
The sampled data of phase detecting circuit 414 and three-phase inversion, power grid and local load frequency detection circuit 408, judges three contraries
Become phase, the frequency of the voltage and current of the parameters such as phase, the frequency of the voltage and current that circuit 23 exports and the input of power grid 32
Whether etc. parameter in grid-connected claimed range, if reaching grid-connected requirement, output control signal connects through switch driving circuit 405
Logical three-phase grid switch 25, three-phase inverting circuit 23 is run with grid-connect mode, and power grid 32 is together, and electricity is provided for local load 31
Can, that is, realize P+ △ P=PLWith Q+ △ Q=QL, then return to step 1；If grid-connected requirement, output control signal are not reached
Three-phase grid switch 25 is disconnected through switch driving circuit 405 and power grid networks and switchs 26, and notifies three-phase inversion controller 402 to stop
The SVPWM control signals through inverse changing driving circuit 407 are only exported, back to step 1；
Step 8：Touch panel controller 401 passes through three-phase inversion, power grid and local load electricity according to sample circuit 404
Press detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load
The sampled data of phase detecting circuit 414 and three-phase inversion, power grid and local load frequency detection circuit 408, judges local negative
Whether the apparent energy for carrying 31 is less than or equal to the apparent energy that three-phase inverting circuit 23 exports, if less than equal to then returning to
Step 1；If it is greater, then output control signal disconnects three-phase grid switch 25 through switch driving circuit 405 and power grid networks and opens
26 are closed, and notifies three-phase inversion controller 402 to stop SVPWM control signal of the output through inverse changing driving circuit 407, back to step
Rapid one.
Compared with prior art, its advantage is as follows：
First, the utility model uses the topological structure and its sine wave space vector pulse duration tune of three-phase full-bridge inverting circuit
SVPWM control technologies processed, the volume of three phase full bridge grid-connected inverting system can be made to diminish, weight saving, cost reduction, possess simultaneously
Net inversion standard is required, and meets the national standard of parallel network reverse, as soft start, voltage unbalance factor, current harmonics,
DC current injection, anti-reverse, back flash sparkle, perfect all kinds of protections and telecommunication etc., its pure sine wave produced is easily adjusted
It is whole, the harm of high-frequency harmonic will not be caused to three phase network.
Second, the utility model is using double Boost circuits and maximum power point tracing method, by touch panel control
Device changes the duty cycle of DC voltage booster circuit drive signal, while monitors the output voltage of booster circuit, this acquisition maximum work
The method of rate point only needs to track the voltage of solar cell, eliminates the calculating of complexity and compares.
3rd, the utility model uses power grid networking switching technique, when avoiding distributed generation system island effect, institute
The circuit Issues on Static Electrification for having power supply to disconnect, prevents to related personnel（Such as power grid maintenance personal and user）Bring the danger of electric shock.
4th, the utility model uses intellectual monitoring and control technology, realizes grid-connected fast with two kinds of operational modes of isolated network
Fast seamless switching peace slip control system, and system does not power off during the conversion of grid-connected and isolated network, considers distributed generation system without special
Existing island effect.
5th, whole system is small, cost is low, low in energy consumption, efficient, security reliability is high, service life is long and sets
Count the advantages that surplus is big.
Brief description of the drawings
Fig. 1 is the structure diagram of 1 solar energy power generating three phase full bridge grid-connected inverting system of the utility model embodiment；
Fig. 2 is the main loop circuit of 1 solar energy power generating three phase full bridge grid-connected inverting system of the utility model embodiment
Figure；
Fig. 3 be in 1 inverter circuit of the utility model embodiment the drive signal of power tube Q3, Q4, Q5, Q6, Q7 and Q8 and
Sinewave output oscillogram.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
Embodiment 1
A kind of solar energy power generating three phase full bridge grid-connected inverting system, as shown in Figure 1, including solar cell 1, three-phase
Full-bridge grid-connected inversion system major loop 2, local load 31, power grid 32, three phase full bridge parallel network reverse control system 4, PC and machine lead to
Believe interface 5；Three phase full bridge grid-connected inverting system major loop 2 is complete with solar cell 1, local load 31, power grid 32, three-phase respectively
Bridge parallel network reverse control system 4 connects, and three phase full bridge parallel network reverse control system 4 is connected with PC and machine communication interface 5, and three-phase is complete
Bridge parallel network reverse control system 4 and solar cell 1, local load 31,32 wireless connection of power grid, simultaneously machine communication interface 5 is PC
With the communication interface of upper PC machine and other solar photovoltaic generation systems and machine；
Three phase full bridge grid-connected inverting system major loop 2 includes input protection switch 21, DC voltage booster circuit 22, three-phase inversion
Circuit 23, Three-phase electric-wave filter 24, three-phase grid switch 25, power grid, which network, switchs 26, and the input termination of input protection switch 21 is too
It is positive can battery 1 output terminal, input protection switch 21, DC voltage booster circuit 22, three-phase inverting circuit 23, Three-phase electric-wave filter 24,
Three-phase grid switch 25, the power grid switch that networks 26 are sequentially connected in series, and the network output terminal of switch 26 of power grid gets access to grid 32 and local negative
Carry 31 input terminal；Local load 31 connects the output terminal of three-phase grid switch 25 and power grid networking switch 26；
Three phase full bridge parallel network reverse control system 4 include touch panel controller 401, three-phase grid inverter controller 402,
Touch-screen 403, sample circuit 404, switch driving circuit 405, booster driving circuit 406, inverse changing driving circuit 407, three contraries
Change, power grid and local load frequency detection circuit 408, battery voltage detection circuit 409, battery current detection circuit 410, boosting
Voltage detecting circuit 411, three-phase inversion, power grid and local load voltage detection circuit 412, three-phase inversion, power grid and local are negative
Carry current detection circuit 413, three-phase inversion, power grid and local load phase detection circuit 414；
Touch panel controller 401 is connected on three-phase grid inverter controller 402, touch-screen 403 and PC and machine communication respectively
One output terminal of interface 5,401 output terminal of touch panel controller connect switch driving circuit 405 and booster driving circuit 406 respectively
An input terminal；
The output terminal of sample circuit 404 meets the one of touch panel controller 401 and three-phase grid inverter controller 402 respectively
Input terminal；
One input terminal of the output termination inverse changing driving circuit 407 of three-phase grid inverter controller 402；
The input protection of first output termination three phase full bridge grid-connected inverting system major loop 2 of switch driving circuit 405 is opened
21 are closed, the three-phase grid switch of the second output termination three phase full bridge grid-connected inverting system major loop 2 of switch driving circuit 405
25, the power grid of the 3rd output termination three phase full bridge grid-connected inverting system major loop 2 of switch driving circuit 405, which networks, switchs 26；
The DC voltage booster circuit 22 of the output termination three phase full bridge grid-connected inverting system major loop 2 of booster driving circuit 406
An input terminal；
The three-phase inverting circuit 23 of the output termination three phase full bridge grid-connected inverting system major loop 2 of inverse changing driving circuit 407
An input terminal；
The input terminal of sample circuit 404 connects three-phase inversion, power grid and local load frequency detection circuit 408, battery respectively
Voltage detecting circuit 409, battery current detection circuit 410, boost voltage detection circuit 411, three-phase inversion, power grid and local are negative
Carry voltage detecting circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local
The output terminal of load phase detection circuit 414.
As shown in Fig. 2, input protection switch 21 includes the first controllable silicon SCR 1 and the second controllable silicon SCR 2；The direct current liter
Volt circuit 22 include the first inductance L1, the second inductance L2, the first diode D1, the second diode D2, the first IGBT power tubes Q1,
2nd IGBT power tubes Q2, the first electrolytic capacitor C1 and the second electrolytic capacitor C2；The three-phase inverting circuit 23 includes the first work(
Rate pipe Q3, the second power tube Q4, the 3rd power tube Q5, the 4th power tube Q6, the 5th power tube Q7 and the 6th power tube Q8；It is described
Three-phase electric-wave filter 24 includes the first inductance L3, the second inductance L4, the 3rd inductance L5, the first capacitance C3, the second capacitance C4 and the 3rd
Capacitance C5；It is two-way that the three-phase grid switch 25 includes the first bidirectional triode thyristor SCR3, the second bidirectional triode thyristor SCR4 and first
Controllable silicon SCR 5；The power grid networking switch 26 includes the first bidirectional triode thyristor SCR6, the second bidirectional triode thyristor SCR7 and the 3rd
Bidirectional triode thyristor SCR8.
As shown in Figure 2,3, input protection switch 21 includes the first controllable silicon SCR 1 and the second controllable silicon SCR 2, and according to three
The amount of capacity of mutually full-bridge grid-connected inversion system design selects silicon-controlled performance parameter；The the first wherein described controllable silicon SCR 1
Connect the cathode and anode of solar cell 1,1 He of the first controllable silicon SCR respectively with the anode of the second controllable silicon SCR 2
The cathode of second controllable silicon SCR 2 connects one end of the first inductance L1 and the second inductance L2 of DC voltage booster circuit 22 respectively, described
The first controllable silicon SCR 1 switch in three phase full bridge parallel network reverse control system 4 connected with the gate pole of the second controllable silicon SCR 2 drive
One output terminal of dynamic circuit 405.
Input protection switch 21 operation principle be：When solar cell 1 leaks electricity, battery plus-negative plate reversal connection, overvoltage and
It is under-voltage（The normal output voltage VDC of the solar cell 1 of the present embodiment is 200V-272V）And three phase full bridge parallel network reverse
When each circuit breaks down in main loop 2, then touch panel controller 401 outputs a control signal to two controllable silicon SCRs 1
With the gate pole of SCR2, so as to disconnect the electrical connection of solar cell 1 and three phase full bridge grid-connected inverting system major loop 2, implement
The protective effect of solar cell 1 and solar photovoltaic generation system.
As shown in Figure 2,3, DC voltage booster circuit includes the first inductance L1, the second inductance L2, the first diode D1, the two or two
Pole pipe D2, the first IGBT power tubes Q1, the 2nd IGBT power tubes Q2, the first electrolytic capacitor C1 and the second electrolytic capacitor C2；Wherein
One end of the first inductance L1 and the second inductance L2 connect two output terminals of input protection switch 21 respectively；Described 1st
The anode tap of pole pipe D1 connects the other end of the first inductance L1, and the cathode terminal of the second diode D2 connects the second inductance L2's
The other end；The collector of the first IGBT power tubes Q1 is even by the anode tap of the first diode D1, the first IGBT power tubes Q1
Emitter connect the collector and composition N zero line sides of the 2nd IGBT power tubes Q2, the emitter of the 2nd IGBT power tubes Q2 connects
Connect the gate terminal connection three phase full bridge of the cathode terminal of the second diode D2, the first IGBT power tubes Q1 and the 2nd IGBT power tubes Q2
Booster driving circuit 406 in parallel network reverse control system 4, the positive terminal of the first electrolytic capacitor C1 connect the first diode
The cathode terminal of D1, the negative pole end of the first electrolytic capacitor C1 connects the positive terminal of the second electrolytic capacitor C2, and connects N zero line sides, the
The negative pole end of two electrolytic capacitor C2 connects the anode tap of the second diode D2, and the positive terminal output of the first electrolytic capacitor C1 is positive
BUS DC voltages, the negative pole end of the second electrolytic capacitor C2 export negative BUS DC voltages；The touch panel controller 401 is applied
Add frequency to fix and duty cycle increase and the pulse switch pwm signal that reduces to the first IGBT power tubes Q1 and the 2nd IGBT power
Pipe Q2, the first inductance L1 and the second inductance L2 are will be coupled into by the switching of conducting and the cut-off of power tube Q1 and Q2
An input terminal solar cell 1 output voltage VDC（The present embodiment is 200V-272V）Be converted to from the first diode D1
Cathode terminal output and the second diode D2 anode tap export ± BUS DC voltages（The present embodiment is ± 400VDC）.
The operation principle of DC voltage booster circuit 22 is：When the first power tube Q1 and the second power tube Q2 is turned on, the first electricity
Feel the electric current increase of L1 and the second inductance L2, stored energy, at this time, the first electrolytic capacitor C1 and the second electrolytic capacitor C2 are by putting
Electric form provides energy to three-phase inverting circuit 23；When the first power tube Q1 and the second power tube Q2 is turned off, the first inductance L1
Exported to the back-end from the first diode D1 and the second diode D2 with the electric current of the second inductance L2, electric current reduces, on the one hand, to three
Phase inverter circuit 23 provides energy, on the other hand charges to the first electrolytic capacitor C1 and the second electrolytic capacitor C2.In this way, pass through
One power tube Q1 and the second power tube Q2 ceaselessly turn-on and turn-off, will make DC voltage booster circuit 22 produce positive and negative direct current output
Voltage（± BUS voltages）, therefore, DC voltage booster circuit 22 can by 200V-272V that solar cell 1 exports conversion output ±
± BUS the DC voltages of 400VDC.
The maximal power tracing control algolithm of the utility model uses simple and effective perturbation observation method, its program worked out
Easily realized in three phase full bridge parallel network reverse control system 4.Its operation principle is：By to 1 output voltage of solar cell
Disturbance change the output power of battery, so as to judge the correctness in voltage disturbance direction with the change of output power,
And Boost circuit is opened as a variable load by the first power tube Q1 and the second power tube Q2 that adjust Boost circuit
Closing the duty cycle D of time can make solar cell 1 work in different operating points.Specifically adjusting method is：The first step, touches
Panel controller 401 gathers the voltage U (k) and electric current I (k) of solar cell 1 in real time, and calculates its output power P (k)=U
(k) I (k), then the voltage U (k-1) and power P (k-1) with last time be compared, obtain voltage difference △ U (k)=U (k)-U
, and product △ PU (k)=△ U (k) △ P (k) of two differences (k-1) and power difference △ P (k)=P (k)-P (k-1)；Second
Step, touch panel controller 401 judges △ PU (k), such as △ PU (k)>0, then give desired voltage values for Uref=U (k)+
Ustep；Such as △ PU (k)<0, then it be Uref=U (k)-Ustep to give desired voltage values, and in formula, Ustep is given voltage step
Into value；3rd step, touch panel controller 401 is according to given desired voltage values Uref and the sampled voltage U of solar cell 1
(k) carry out difference operation is E (k)=Uref-U (k), passes through proportional integration（PI）Control algolithm calculates accounting for for control signal
Sky is than D, and when given desired voltage values reduce, calculating the duty cycle D reached will increase, when making Boost circuit switch closure
Between it is elongated so that the electric current of the first inductance L1 and the second inductance L2 will increase, according to the working characteristics of solar cell, electric current
Become larger, voltage will reduce, and the power of output will be close to maximum power point；When given desired voltage values raise, calculate
The duty cycle D reached will reduce, and reduce Boost circuit switch-closed time, so that the first inductance L1 and the second inductance L2
Electric current will reduce, according to the working characteristics of solar cell, electric current diminishes, and voltage will increase, and the power of output will
It is close to maximum power point, so as to achieve the purpose that to adjust 1 output power of solar cell.When power tracking to maximum power point
When, given desired voltage values are equal with actual voltage value, the degree of regulation very little of output power, and the duty cycle D of control signal is kept
Stablize.
As shown in Figure 2,3, three-phase inverting circuit 23 include the first power tube Q3, the second power tube Q4, the 3rd power tube Q5,
4th power tube Q6, the 5th power tube Q7 and the 6th power tube Q8；Wherein described first power tube Q1, the 3rd power tube Q5 and
The cathode terminal and first of the first diode D1 of DC voltage booster circuit 22 is connected after the unified connection of the collector terminal of five power tube Q7
The emitter terminal of the positive terminal of electrolytic capacitor C1, the second power tube Q4, the 4th power tube Q6 and the 6th power tube Q8 are unified
The cathode terminal of the second diode D2 and the negative pole end of the second electrolytic capacitor C2 of DC voltage booster circuit 22 are connected after connection；Described
The emitter terminal of one power tube Q3 connects the collector terminal of the second power tube Q4, and connects the first inductance L3 of Three-phase electric-wave filter 24
One end；The emitter terminal of the 3rd power tube Q5 connects the collector terminal of the 4th power tube Q6, and connects Three-phase electric-wave filter
One end of 24 the second inductance L4；The emitter terminal of the 5th power tube Q7 connects the collector terminal of the 6th power tube Q8, and
Connect one end of the 3rd inductance L5 of Three-phase electric-wave filter 24；The first power tube Q3, the second power tube Q4, the 3rd power tube
All gate terminals connection three phase full bridge parallel network reverse control of Q5, the 4th power tube Q6, the 5th power tube Q7 and the 6th power tube Q8
The output terminal of inverse changing driving circuit 407 in system 4 processed.
The operation principle of three-phase inverting circuit 23 is：As shown in figure 3, the first power tube Q3, the second power tube Q4, the 3rd work(
Rate pipe Q5, the 4th power tube Q6, the 5th power tube Q7 and the 6th power tube Q8 sinusoidal wave pulse drive waveforms in, high level table
Show six power tube conductings, low level represents six power tube cut-offs, wherein the first power tube Q3 and the second power tube Q4,
3rd power tube Q5 and the 4th power tube Q6, the 5th power tube Q7 and the 6th power tube Q8 form three bridge arms.First, each bridge arm
Lower power tube is alternate conduction；Secondly, in a sinusoidal cycles, each bridge arm lower power tube turns on 180 °；3rd, each bridge
The phase difference that arm is begun to turn on is 120 °, and any moment has three bridge arms to simultaneously turn on.As shown in figure 3, when the first power tube
During Q3, the 3rd power tube Q5, the 5th power tube Q7 cut-offs, then the second power tube Q4, the 4th power tube Q6, the 6th power tube Q8
Turned on and ended with fixed frequency but duty cycle difference；As the second power tube Q4, the 4th power tube Q6, the 6th power tube Q8
During cut-off, then the first power tube Q3, the 3rd power tube Q5, the 5th power tube Q7 are led with fixed frequency but duty cycle difference
Logical and cut-off.Such conducting and cut-off mode causes in the first power tube Q3, the second power tube Q4 and Three-phase electric-wave filter 24
Waveform is waveform Va shown in Fig. 3, the 3rd power tube Q5, the 4th power tube Q6 and three-phase filtering on the tie point a of first inductance L3
Waveform is waveform Vb shown in Fig. 3 on the tie point b of the second inductance L4 in device 24, the 5th power tube Q7, the 6th power tube Q8 and
Waveform is waveform Vc shown in Fig. 3 on the tie point c of the 3rd inductance L4 in Three-phase electric-wave filter 24.In one embodiment, Va,
Vb, Vc waveform are that high level is+400V, and low level is -400V, its intermediate value is the output sine wave pulse width modulated SPWM of 0V
Signal.
As shown in Figure 2,3, Three-phase electric-wave filter 24 includes the first inductance L3, the second inductance L4, the 3rd inductance L5, the first capacitance
C3, the second capacitance C4 and the 3rd capacitance C5；The other end of wherein described first inductance L3, the second inductance L4 and the 3rd inductance L5 point
Behind the one end for not connecting the first capacitance C3, the second capacitance C4 and the 3rd capacitance C5, and connect three-phase grid switch 25 three are defeated
Enter to hold, the other end connection power grid 32 of the first capacitance C3, the second capacitance C4 and the 3rd capacitance C5 and the one of local load 31
A public N zero line sides.
The operation principle of Three-phase electric-wave filter 24 is：As shown in figure 3, pass through the first inductance L3, the second inductance L4, the 3rd inductance
The filtering of L5 and the first capacitance C3, the second capacitance C4 and the 3rd capacitance C5, by voltage Va, the radio-frequency component in Vb, Vc filters off,
The output terminal of Three-phase electric-wave filter 24 just obtains three phase sine the waveform VA, VB, VC that phase difference as shown in Figure 3 is 120 °.One
In a embodiment, VA, VB, the output frequency of VC is 50 ± 0.2Hz, and voltage is 220V ± 5%, Xiang Wei Cha≤30', current harmonics
THD≤3%, the rated current of DC current injection Zhi≤0.5%.Due to three-phase inverting circuit 23 driving SPWM control signals and
Va, Vb, Vc waveform are high-frequency signal, so in Fig. 3, by six power tubes Q3, Q4, Q5, Q6, Q7, Q8 and Va, the height of Vb, Vc
Diagram three-phase sine-wave waveform is obtained after the filtering of frequency waveform frequency.High frequency waveforms each cycle time is equal（I.e. frequency is fixed, this
It is 20kHz in embodiment）, but the time ratio for turning on and ending every time（That is duty cycle）It is different.Duty cycle is by small change
Diminish again greatly, and the rule changed follows the rule of SPWM.In this way, pass through the first inductance L3 and the first capacitance C3, the second inductance
After L4 and the second capacitance C4, the 3rd inductance L5 and the 3rd capacitance C5 filter high frequency section, remaining low frequency part is exactly 50Hz
Sine wave.Moreover, designed by the three-phase grid inverter controller 402 in three phase full bridge parallel network reverse control system 4 three
The feedback control of 23 output voltage of phase inverter circuit, can be adjusted in real time according to the size of three-phase output voltage six power tube Q3,
The duty cycle of the drive signal of Q4, Q5, Q6, Q7, Q8, so as to ensure the three-phase output voltage VA, VB, VC of three-phase inverting circuit 23
In certain accuracy rating, moreover, by the control strategy of three-phase grid inverter controller 402, three bridge arms are made to start to lead
Logical phase difference is 120 °, and any moment has three bridge arms to simultaneously turn on.Therefore, the output terminal of Three-phase electric-wave filter 24 just obtains
Phase difference as shown in Figure 3 is 120 ° of three phase sine waveform VA, VB, VC.
As shown in Figure 2,3, three-phase grid switch 25 include the first bidirectional triode thyristor SCR3, the second bidirectional triode thyristor SCR4 and
First bidirectional triode thyristor SCR5；Wherein described first bidirectional triode thyristor SCR3, the second bidirectional triode thyristor SCR4 and the 3rd is two-way can
One end of control silicon SCR5 connects an output of the first inductance L1, the second inductance L2, the 3rd inductance L3 of Three-phase electric-wave filter 24 respectively
The three-phase input end of end, the local load 31 of its other end connection and power grid networking switch 26；The first bidirectional triode thyristor SCR3,
In the gate pole connection three phase full bridge parallel network reverse control system 4 of second bidirectional triode thyristor SCR4 and the 3rd bidirectional triode thyristor SCR5
Another output terminal of switch driving circuit 405.
Three-phase grid switch 25 operation principle be：The touch panel controller of three phase full bridge parallel network reverse control system 4
401 output voltage by sample circuit 404 to DC boosting voltage 22（± BUS voltages）, three-phase inversion output and power grid 32
The parameter such as voltage, electric current, frequency and phase be detected and control, i.e. it is the first bidirectional triode thyristor SCR3, second two-way controllable
The switch of silicon SCR4 and the first bidirectional triode thyristor SCR5 by three phase full bridge parallel network reverse control system 4 touch panel controller
401 are controlled.When the first bidirectional triode thyristor SCR3, the second bidirectional triode thyristor SCR4 and the first bidirectional triode thyristor SCR5 are turned on
When, the output of Three-phase electric-wave filter 24（That is sine wave VA, VB, VC）Network with local load 31 and power grid and switch 26 electric connections；
When the first bidirectional triode thyristor SCR3, the second bidirectional triode thyristor SCR4 and the first bidirectional triode thyristor SCR5 end, then three-phase is filtered
Ripple device 24 is disconnected with local load 31 and power grid networking switch 26.For example, work as DC voltage booster circuit 22 and three-phase inverting circuit
23 break down suddenly, then the touch panel controller 401 of three phase full bridge parallel network reverse control system 4 sends control and refers to immediately
Order, closes three controllable silicon SCRs 3, SCR4 and the SCR5 of three-phase grid switch 25.Since the silicon-controlled zero-time switchs spy
Property, then three-phase inverting circuit 23 is turned off with local load 31 and power grid 32, realizes three phase full bridge grid-connected inverting system master
Gapless between circuit 2 and local load 31 and power grid 32 switches.Conversely, work as three phase full bridge grid-connected inverting system major loop 2
When recovering normal work, three-phase grid switch 25 can equally realize that three phase full bridge grid-connected inverting system is seamlessly cut into power grid
In 32.
As shown in Figure 2,3, power grid network switch 26 include the first bidirectional triode thyristor SCR6, the second bidirectional triode thyristor SCR7 and
3rd bidirectional triode thyristor SCR8；Wherein described first bidirectional triode thyristor SCR6, the second bidirectional triode thyristor SCR7 and the 3rd is two-way can
One end of control silicon SCR8 connects the three-phase input end of local load 31 and the three-phase output end of three-phase grid switch 25 respectively, its is another
One end connects the three-phase input end of power grid 32；The first bidirectional triode thyristor SCR7, second bidirectional triode thyristor SCR8 and the 3rd pair
Another output of switch driving circuit 405 into the gate pole connection three phase full bridge parallel network reverse control system 4 of controllable silicon SCR 8
End.
Power grid network switch 26 operation principle be：The touch panel controller of three phase full bridge parallel network reverse control system 4
401 export Three-phase electric-wave filter 24 by sample circuit 404, local voltage, electric current, frequency and the phase for loading 31 and power grid 32
Be detected and control etc. parameter, i.e. the first bidirectional triode thyristor SCR6, the second bidirectional triode thyristor SCR7 and the first bidirectional triode thyristor
The switch of SCR8 is controlled by the touch panel controller 401 of three phase full bridge parallel network reverse control system 4.When three it is silicon-controlled
When SCR6, SCR7 and SCR8 are turned on, power grid 32 is electrically connected with local load 31 and three-phase grid switch 25；When three it is controllable
When silicon SCR6, SCR7 and SCR8 end, then power grid 32 electrically disconnects with local load 31 and three-phase grid switch 25.For example,
When power grid 32 breaks down or produce suddenly isolated island, or even power-off suddenly, or three phase full bridge grid-connected inverting system major loop 2 is prominent
So break down, or the local overload of load 31 and short circuit, then the touch panel control of three phase full bridge parallel network reverse control system 4
Device 401 sends control instruction immediately, closes three controllable silicon SCRs 3, SCR4 and the SCR5 of power grid networking switch 26.Due to can
The zero-time switching characteristic of silicon is controlled, then power grid 32 is turned off with three-phase inverting circuit 23 and local load 31, realizes power grid
Gapless between 32 and three phase full bridge grid-connected inverting system major loop 2 and local load 31 switches.Conversely, when power grid 32 is all
Failure, when either three phase full bridge grid-connected inverting system major loop 2 or local load 31 recover normal work, power grid networks and opens
Closing 26 can equally realize that power grid 32 is seamlessly cut into three phase full bridge grid-connected inverting system major loop 2.
The control method of above-mentioned solar energy power generating three-phase grid-connected inverting system, comprises the following steps that：
Step 1：Touch panel controller 401 obtains sample circuit 404 and passes through battery voltage detection circuit 409, battery electricity
Current detection circuit 410, boost voltage detection circuit 411, three-phase inversion, power grid and local load voltage detection circuit 412, three-phase
Inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load phase detection circuit 414 and three
Phase inversion, power grid and local load frequency detection circuit 408, the voltage of the solar cell 1 collected respectively and electric current and
Its polarity, the generating positive and negative voltage of DC voltage booster circuit 22, three-phase inversion, power grid and the voltage locally loaded, electric current, phase and frequency
Rate, touch panel controller 401 are received after the sample information of sample circuit 404 by its internal digital processing DSP-
TMS320LF24x chips, GPLD chips handle to obtain three-phase inverting circuit 23, power grid 32 and local load 31 active-power P,
PL, △ P and reactive power Q, QL、△Q；
Step 2：Touch panel controller 401 passes through battery voltage detection circuit 409, battery electricity according to sample circuit 404
Current detection circuit 410, boost voltage detection circuit 411 sample voltage, electric current and the DC boosting of obtained solar panel 1
The voltage condition of circuit 22, judging the solar cell 1, whether polar signal is normal over the ground, voltage and the electricity of solar cell 1
Whether stream is normal, and whether the voltage of DC voltage booster circuit 22 is over-pressed, if all parameters are normal, touch panel controller
401 output control signals connect input protection switch 21 through switch driving circuit 405, go successively to step 3；If wherein have
Parameter is abnormal, then output control signal disconnects input protection switch 21 through switch driving circuit 405, three-phase grid switchs 25 and
Power grid, which networks, switchs 26, stops exporting the pwm control signal of boosted drive circuit 406, and notifies three-phase grid inversion control
Device 402 stops sine wave space vector pulse width modulation SVPWM signal of the output through inverse changing driving circuit 407, back to step
Rapid one, for example, whether the cell voltage VDC of solar cell 1 in setting range, as between 200V-276V, cathode and
Whether anode is correct, and the electric current of solar cell 1 is according to DC voltage booster circuit 22, three-phase inverting circuit 23, Three-phase electric-wave filter 24
Design capacity size be set in prescribed limit, the leakage current of solar cell 1 also in setting range, as leakage current≤
10mA, if these parameters are all normal, performs step 3, otherwise back to step 1；
Step 3：After 401 output control signal of touch panel controller connects input protection switch 21, solar cell 1
DC voltage access three phase full bridge grid-connected inverting system major loop 2 in, touch panel controller 401 exports boosted driving electricity
The pwm control signal on road 406 is controlled to DC voltage booster circuit 22, i.e. DC boosting, promotes the DC voltage liter of solar cell 1
Be depressed into positive negative dc voltage i.e. ± BUS voltages, go successively to step 4, wherein, DC voltage booster circuit 22 implement maximum power with
Track controls（MPPT）；
Step 4：Touch panel controller 401 is sampled according to sample circuit 404 by boost voltage detection circuit 411
The information of the DC voltage booster circuit 22 arrived, judges the positive negative dc voltage of DC voltage booster circuit 22（± BUS voltages）Whether just
In normal scope, if in normal range (NR), touch panel controller 401 notifies three-phase grid inverter controller 402 to export warp
The SVPWM control signals of inverse changing driving circuit 407, i.e. three-phase inverting circuit 23 control, and promote positive negative dc voltage to be reverse into three
Cross streams voltage, and the three-phase alternating current of the frequency of 23 output voltage of three-phase inverting circuit and electric current, phase and amplitude and power grid 32
The same frequency of electricity, same phase and constant amplitude（Voltage magnitude can have certain deviation, and such as ± 3%）, go successively to step 5；If not just
In normal scope, then 401 output control signal of touch panel controller through switch driving circuit 405 disconnect input protection switch 21,
Three-phase grid switch 25 and power grid, which network, switchs 26, stops exporting the pwm control signal of boosted drive circuit 406, and notifies
Three-phase inversion controller 402 stops SVPWM control signal of the output through inverse changing driving circuit 407, and back to step 1, citing comes
Say, the positive negative dc voltage ± BUS of DC voltage booster circuit 22 is in setting range in the ± 320- ± 400VDC of position, if these are joined
Number is all normal, then performs step 5；If wherein a certain parameter is abnormal, such as ± BUS electric voltage over press（More than 400V）Or owe
Pressure（Less than -320V）, then disconnect input protection switch 21, three-phase grid switch 25 and power grid and network and switch 26, stop output warp
The pwm control signal of booster driving circuit 406, and notify three-phase inversion controller 402 to stop output through inverse changing driving circuit 407
SVPWM control signals, back to step 1；
Step 5：Touch panel controller 401 passes through three-phase inversion, power grid and local load electricity according to sample circuit 404
Press detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load
The sampled data of phase detecting circuit 414 and three-phase inversion, power grid and local load frequency detection circuit 408, judges three contraries
Become the parameters such as phase, the frequency of the voltage and current that circuit 23 exports whether in normal range (NR), if in normal range (NR), after
It is continuous to enter step six；If not in normal range (NR), output control signal disconnects three-phase grid through switch driving circuit 405 and opens
25 and power grid networking switch 26 are closed, and notify three-phase inversion controller 402 to stop space arrow of the output through inverse changing driving circuit 407
Pulse width modulation SVPWM control signals are measured, back to step 1；For example, this distributed solar electricity generation system meets
Standard GB/T/T the 19939-2005 and the technical conditions of international standard IEEE1547 and IEC1747 that power grid 32 interconnects, three-phase
The rated voltage of 23 output voltage Bo Dong of inverter circuit≤± 5%, frequency range in 50Hz ± 0.2Hz, phase difference setting range≤
30 ', current harmonics THD≤± 3%, direct current stream injects the parameters such as≤± 0.5% rated current, if these parameters are all normal,
Then perform step 6；If wherein a certain parameter is abnormal, disconnects three-phase grid switch 25 and power grid networks and switchs 26, and lead to
Know that three-phase inversion controller 402 stops space vector pulse width modulation SVPWM control letter of the output through inverse changing driving circuit 407
Number, back to step 1；
Step 6：Touch panel controller 401 passes through three-phase inversion, power grid and local load electricity according to sample circuit 404
Press detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load
The sampled data of phase detecting circuit 414 and three-phase inversion, power grid and local load frequency detection circuit 408, judges power grid 32
Voltage, electric current, the parameter such as phase and frequency whether in normal range (NR), if in normal range (NR), output control signal
Power grid networking switch 26 is connected through switch driving circuit 405, and exports the space vector pulse duration through inverse changing driving circuit 407
Modulation SVPWM control signals make three-phase inverting circuit 23 work in PQ control models, go successively to step 7；If not normal
In the range of, then output control signal disconnects power grid networking switch 26 through switch driving circuit 405, and exports through inverse changing driving circuit
407 space vector pulse width modulation SVPWM control signals make three-phase inverting circuit 23 work in V/f control models, then
Three-phase grid switch 25 is connected, circuit 23 provides electric energy by local load 31 of isolated power grid pattern, enters step eight；
Step 7：Touch panel controller 401 passes through three-phase inversion, power grid and local load electricity according to sample circuit 404
Press detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load
The sampled data of phase detecting circuit 414 and three-phase inversion, power grid and local load frequency detection circuit 408, judges three contraries
Become phase, the frequency of the voltage and current of the parameters such as phase, the frequency of the voltage and current that circuit 23 exports and the input of power grid 32
Etc. parameter whether in grid-connected claimed range, that is, the standard GB/T/T 19939-2005 and international standard IEEE1547 that interconnect
With the technical conditions of IEC1747, if reaching grid-connected requirement, output control signal connects three-phase through switch driving circuit 405
Grid-connected switch 25, three-phase inverting circuit 23 is run with grid-connect mode, and power grid 32 is together, provides electric energy for local load 31, i.e.,
Realize P+ △ P=PLWith Q+ △ Q=QL, then return to step 1；If not reaching grid-connected requirement, output control signal is through opening
Close drive circuit 405 and disconnect three-phase grid switch 25 and power grid networking switch 26, and it is defeated to notify that three-phase inversion controller 402 stops
Go out the SVPWM control signals through inverse changing driving circuit 407, back to step 1；
Step 8：Touch panel controller 401 passes through three-phase inversion, power grid and local load electricity according to sample circuit 404
Press detection circuit 412, three-phase inversion, power grid and local load current detection circuit 413, three-phase inversion, power grid and local load
The sampled data of phase detecting circuit 414 and three-phase inversion, power grid and local load frequency detection circuit 408, judges local negative
Whether the apparent energy for carrying 31 is less than or equal to the apparent energy that three-phase inverting circuit 23 exports, if less than equal to then returning to
Step 1；If it is greater, then output control signal disconnects three-phase grid switch 25 through switch driving circuit 405 and power grid networks and opens
26 are closed, and notifies three-phase inversion controller 402 to stop SVPWM control signal of the output through inverse changing driving circuit 407, back to step
Rapid one.
Claims (9)
1. a kind of solar energy power generating three phase full bridge grid-connected inverting system, it is characterised in that including solar cell（1）, three
Mutually full-bridge grid-connected inversion system major loop（2）, local load（31）, power grid（32）, three phase full bridge parallel network reverse control system
（4）, PC and machine communication interface（5）；Three phase full bridge grid-connected inverting system major loop（2）Respectively with solar cell（1）, it is local negative
Carry（31）, power grid（32）, three phase full bridge parallel network reverse control system（4）Connection, three phase full bridge parallel network reverse control system（4）With
PC and machine communication interface（5）Connection, three phase full bridge parallel network reverse control system（4）With solar cell（1）, local load
（31）, power grid（32）Wireless connection；
Three phase full bridge grid-connected inverting system major loop（2）Including inputting protection switch（21）, DC voltage booster circuit（22）, three contraries
Become circuit（23）, Three-phase electric-wave filter（24）, three-phase grid switch（25）, power grid network switch（26）, input protection switch（21）
Input termination solar cell（1）Output terminal, input protection switch（21）, DC voltage booster circuit（22）, three-phase inversion electricity
Road（23）, Three-phase electric-wave filter（24）, three-phase grid switch（25）, power grid network switch（26）It is sequentially connected in series, power grid, which networks, to be switched
（26）Output terminal get access to grid（32）With local load（31）Input terminal；Local load（31）Connect three-phase grid switch（25）With
Power grid, which networks, to be switched（26）Output terminal；
Three phase full bridge parallel network reverse control system（4）Including touch panel controller（401）, three-phase grid inverter controller
（402）, touch-screen（403）, sample circuit（404）, switch driving circuit（405）, booster driving circuit（406）, inversion driving
Circuit（407）, three-phase inversion, power grid and local load frequency detection circuit（408）, battery voltage detection circuit（409）, battery
Current detection circuit（410）, boost voltage detection circuit（411）, three-phase inversion, power grid and local load voltage detection circuit
（412）, three-phase inversion, power grid and local load current detection circuit（413）, three-phase inversion, power grid and the inspection of local load phase
Slowdown monitoring circuit（414）；
The touch panel controller（401）Three-phase grid inverter controller is connected on respectively（402）, touch-screen（403）With PC simultaneously
Machine communication interface（5）An output terminal, touch panel controller（401）Output terminal connects switch driving circuit respectively（405）And liter
Press drive circuit（406）An input terminal；
The sample circuit（404）Output terminal connect touch panel controller respectively（401）With three-phase grid inverter controller
（402）An input terminal；
The three-phase grid inverter controller（402）Output termination inverse changing driving circuit（407）An input terminal；
The switch driving circuit（405）First output termination three phase full bridge grid-connected inverting system major loop（2）Input protect
Shield switch（21）, switch driving circuit（405）Second output termination three phase full bridge grid-connected inverting system major loop（2）Three-phase
Grid-connected switch（25）, switch driving circuit（405）The 3rd output termination three phase full bridge grid-connected inverting system major loop（2）Electricity
Net, which networks, to be switched（26）；
The booster driving circuit（406）Output termination three phase full bridge grid-connected inverting system major loop（2）DC boosting electricity
Road（22）An input terminal；
The inverse changing driving circuit（407）Output termination three phase full bridge grid-connected inverting system major loop（2）Three-phase inversion electricity
Road（23）An input terminal；
The sample circuit（404）Input terminal connect three-phase inversion, power grid and local load frequency detection circuit respectively（408）、
Battery voltage detection circuit（409）, battery current detection circuit（410）, boost voltage detection circuit（411）, three-phase inversion, electricity
Net and local load voltage detection circuit（412）, three-phase inversion, power grid and local load current detection circuit（413）, three contraries
Change, power grid and local load phase detection circuit（414）Output terminal.
2. solar energy power generating three phase full bridge grid-connected inverting system according to claim 1, it is characterised in that the input
Protection switch（21）It is silicon-controlled including first（SCR1）It is silicon-controlled with second（SCR2）；The DC voltage booster circuit（22）Including
One inductance（L1）, the second inductance（L2）, the first diode（D1）, the second diode（D2）, the first IGBT power tubes（Q1）, second
IGBT power tubes（Q2）, the first electrolytic capacitor（C1）With the second electrolytic capacitor（C2）；The three-phase inverting circuit（23）Including
One power tube（Q3）, the second power tube（Q4）, the 3rd power tube（Q5）, the 4th power tube（Q6）, the 5th power tube（Q7）With
Six power tubes（Q8）；The Three-phase electric-wave filter（24）Including the first inductance（L3）, the second inductance（L4）, the 3rd inductance（L5）,
One capacitance（C3）, the second capacitance（C4）With the 3rd capacitance（C5）；The three-phase grid switch（25）Including the first bidirectional triode thyristor
（SCR3）, the second bidirectional triode thyristor（SCR4）With the first bidirectional triode thyristor（SCR5）；The power grid, which networks, to be switched（26）Including
One bidirectional triode thyristor（SCR6）, the second bidirectional triode thyristor（SCR7）With the 3rd bidirectional triode thyristor（SCR8）.
3. solar energy power generating three phase full bridge grid-connected inverting system according to claim 2, it is characterised in that the input
Protection switch（21）It is first silicon-controlled（SCR1）It is silicon-controlled with second（SCR2）Anode connect solar cell respectively（1）'s
Cathode and anode, first is silicon-controlled（SCR1）It is silicon-controlled with second（SCR2）Cathode connect DC voltage booster circuit respectively（22）'s
First inductance（L1）With the second inductance（L2）One end, first is silicon-controlled（SCR1）It is silicon-controlled with second（SCR2）Gate pole connection
Three phase full bridge parallel network reverse control system（4）In switch driving circuit（405）An output terminal.
4. solar energy power generating three phase full bridge grid-connected inverting system according to claim 2, it is characterised in that the direct current
Booster circuit（22）The first inductance（L1）And second inductance（L2）One end connect input protection switch respectively（21）Two
Output terminal；First diode（D1）Anode tap connect the first inductance（L1）The other end, second diode（D2）
Cathode terminal connect the second inductance（L2）The other end；The first IGBT power tubes（Q1）Collector even press the first diode
（D1）Anode tap, the first IGBT power tubes（Q1）Emitter connect the 2nd IGBT power tubes（Q2）Collector and composition N
Zero line side, the 2nd IGBT power tubes（Q2）Emitter connect the second diode（D2）Cathode terminal, the first IGBT power tubes
（Q1）With the 2nd IGBT power tubes（Q2）Gate terminal connection three phase full bridge parallel network reverse control system（4）In boosting driving electricity
Road（406）, first electrolytic capacitor（C1）Positive terminal connect the first diode（D1）Cathode terminal, the first electrolytic capacitor
（C1）Negative pole end connect the second electrolytic capacitor（C2）Positive terminal, and connect N zero line sides, the second electrolytic capacitor（C2）Anode
The second diode of end connection（D2）Anode tap, the first electrolytic capacitor（C1）Positive terminal export positive BUS DC voltages, second
Electrolytic capacitor（C2）The negative BUS DC voltages of negative pole end output.
5. solar energy power generating three phase full bridge grid-connected inverting system according to claim 2, it is characterised in that the direct current
Booster circuit（22）The first power tube（Q1）, three-phase inverting circuit（23）3rd power tube（Q5）And three-phase inverting circuit（23）
5th power tube（Q7）The unified connection of collector terminal after connect DC voltage booster circuit（22）The first diode（D1）Cathode
End and the first electrolytic capacitor（C1）Positive terminal, second power tube（Q4）, the 4th power tube（Q6）With the 6th power tube
（Q8）The unified connection of emitter terminal after connect DC voltage booster circuit（22）The second diode（D2）Cathode terminal and second electricity
Solve capacitance（C2）Negative pole end；First power tube（Q3）Emitter terminal connect the second power tube（Q4）Collector terminal,
And connect Three-phase electric-wave filter（24）The first inductance（L3）One end；3rd power tube（Q5）Emitter terminal connection the 4th
Power tube（Q6）Collector terminal, and connect Three-phase electric-wave filter（24）The second inductance（L4）One end；5th power tube
（Q7）Emitter terminal connect the 6th power tube（Q8）Collector terminal, and connect Three-phase electric-wave filter（24）The 3rd inductance（L5）
One end；First power tube（Q3）, the second power tube（Q4）, the 3rd power tube（Q5）, the 4th power tube（Q6）, the 5th work(
Rate pipe（Q7）With the 6th power tube（Q8）All gate terminals connection three phase full bridge parallel network reverse control system（4）Inversion driving
Circuit（407）Output terminal.
6. solar energy power generating three phase full bridge grid-connected inverting system according to claim 2, it is characterised in that the three-phase
Wave filter（24）The first inductance（L3）, the second inductance（L4）With the 3rd inductance（L5）The other end connect the first capacitance respectively
（C3）, the second capacitance（C4）With the 3rd capacitance（C5）One end after, and connect three-phase grid switch（25）Three input terminals, institute
State the first capacitance（C3）, the second capacitance（C4）With the 3rd capacitance（C5）The other end connection power grid（32）With local load（31）'s
One public N zero line side.
7. solar energy power generating three phase full bridge grid-connected inverting system according to claim 2, it is characterised in that the three-phase
Grid-connected switch（25）The first bidirectional triode thyristor（SCR3）, the second bidirectional triode thyristor（SCR4）With the 3rd bidirectional triode thyristor（SCR5）
One end connect Three-phase electric-wave filter respectively（24）The first inductance（L1）, the second inductance（L2）, the 3rd inductance（L3）An output
End, the local load of its other end connection（31）Network and switch with power grid（26）Three-phase input end；First bidirectional triode thyristor
（SCR3）, the second bidirectional triode thyristor（SCR4）With the 3rd bidirectional triode thyristor（SCR5）Gate pole connection three phase full bridge parallel network reverse control
System processed（4）In switch driving circuit（405）Another output terminal.
8. solar energy power generating three phase full bridge grid-connected inverting system according to claim 2, it is characterised in that the power grid
Network switch（26）The first bidirectional triode thyristor（SCR6）, the second bidirectional triode thyristor（SCR7）With the 3rd bidirectional triode thyristor（SCR8）
One end connect local load respectively（31）Three-phase input end and three-phase grid switch（25）Three-phase output end, its other end
Connect power grid（32）Three-phase input end；First bidirectional triode thyristor（SCR7）, the second bidirectional triode thyristor（SCR8）With the 3rd
Bidirectional triode thyristor（SCR8）Gate pole connection three phase full bridge parallel network reverse control system（4）In switch driving circuit（405）'s
Another output terminal.
9. solar energy power generating three phase full bridge grid-connected inverting system according to claim 2, it is characterised in that the touch
Panel controller（401）With three-phase grid inverter controller（402）It is described including digital processing DSP-TMS320LF24x chips
Switch driving circuit（405）, booster driving circuit（406）And inverse changing driving circuit（407）Including programmable logic CPLD chips,
The touch panel controller（401）An input/output terminal pass through PC and machine communication interface（5）Connect host computer PC or other
The three phase full bridge parallel network reverse control system of parallel running（4）, the touch panel controller（401）According to solar cell
（1）Voltage and current monitor its peak power output, and adjust DC voltage booster circuit accordingly（22）Drive signal duty
Than implementing maximal power tracing control；The three-phase grid inverter controller（402）, implement grid-connected and two kinds of operation moulds of isolated network
Formula is controlled and its taken over seamlessly, and according to DC voltage booster circuit（22）Positive negative dc voltage, three-phase inverting circuit（23）, power grid
（32）With local load（31）Three-phase current, voltage, frequency, phase, power, determine output to three-phase inverting circuit（23）'s
High_frequency sine wave space vector pulse width modulation SVPWM control signals.
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| CN201720532770.XU CN207251220U (en) | 2017-05-15 | 2017-05-15 | A kind of solar energy power generating three phase full bridge grid-connected inverting system |
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| CN201720532770.XU CN207251220U (en) | 2017-05-15 | 2017-05-15 | A kind of solar energy power generating three phase full bridge grid-connected inverting system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086600A (en) * | 2017-05-15 | 2017-08-22 | 昆明理工大学 | A kind of solar energy power generating three phase full bridge grid-connected inverting system |
| CN108695886A (en) * | 2018-05-23 | 2018-10-23 | 昆明理工大学 | A kind of grid-connected inverting system of fuel cell and solar cell mixed power generation |
| CN109256817A (en) * | 2018-11-27 | 2019-01-22 | 南方电网科学研究院有限责任公司 | Control the method and device that DC micro-electric network interface inverter carries out frequency adjusting |
| CN112688419A (en) * | 2021-01-27 | 2021-04-20 | 洛阳市质量计量检测中心 | Photovoltaic power generation grid-connected double-loop power supply system and method |
-
2017
- 2017-05-15 CN CN201720532770.XU patent/CN207251220U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086600A (en) * | 2017-05-15 | 2017-08-22 | 昆明理工大学 | A kind of solar energy power generating three phase full bridge grid-connected inverting system |
| CN108695886A (en) * | 2018-05-23 | 2018-10-23 | 昆明理工大学 | A kind of grid-connected inverting system of fuel cell and solar cell mixed power generation |
| CN109256817A (en) * | 2018-11-27 | 2019-01-22 | 南方电网科学研究院有限责任公司 | Control the method and device that DC micro-electric network interface inverter carries out frequency adjusting |
| CN112688419A (en) * | 2021-01-27 | 2021-04-20 | 洛阳市质量计量检测中心 | Photovoltaic power generation grid-connected double-loop power supply system and method |
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