CN106952547A - Grid-connected photovoltaic power generation experiment device for teaching - Google Patents
Grid-connected photovoltaic power generation experiment device for teaching Download PDFInfo
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- CN106952547A CN106952547A CN201710362371.8A CN201710362371A CN106952547A CN 106952547 A CN106952547 A CN 106952547A CN 201710362371 A CN201710362371 A CN 201710362371A CN 106952547 A CN106952547 A CN 106952547A
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- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims description 5
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- 238000012549 training Methods 0.000 abstract description 5
- 238000011160 research Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 4
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- 230000001360 synchronised effect Effects 0.000 description 3
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/188—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for motors; for generators; for power supplies; for power distribution
Abstract
The invention discloses a kind of grid-connected photovoltaic power generation system experiment device for teaching, grid-connected photovoltaic power generation system includes small-power photovoltaic array and grid-connected photovoltaic inverter, and small-power photovoltaic array is connected by DC BUS with grid-connected photovoltaic inverter；AC network simulation system is made up of variable-frequency governor, GCU, automobile current generator and AC load device, and automobile current generator is connected with variable-frequency governor and GCU, and automobile current generator is connected with grid-connected photovoltaic inverter and AC load device respectively by AC BUS.The problem such as the present invention solves traditional grid-connected photovoltaic power generation system teaching experiment platform and training platform complex structure, expensive, security be poor, operating cost is low and safe and reliable, meets the economy and security requirement of colleges and universities and scientific research institutions to grid-connected photovoltaic power generation teaching experiment.
Description
Technical field
The present invention relates to photovoltaic power generation grid-connecting technology, more particularly to grid-connected photovoltaic power generation experiment device for teaching.
Background technology
Grid-connected photovoltaic power generation is one of important channel that new energy development is utilized.Grid-connected photovoltaic power generation system includes photovoltaic battle array
Row and combining inverter, wherein combining inverter is the core apparatus of photovoltaic generating system.Due to photovoltaic array export electric current,
Voltage has strong non-linear, and the condition such as light intensity and environment temperature due to photovoltaic array local environment is continually changing,
It is stable alternating current that combining inverter, which not only has the DC conversion that will be continually changing, it is necessary to complicated power most
A little bigger track algorithm（MPPT）With synchronous grid-connected algorithm.For the ease of scientific research institutions to the complex control algorithm of combining inverter
Exploitation, and colleges and universities, to the experimental center demand of grid-connected photovoltaic power generation system principle and popularization, some companies release various
The experiment of photovoltaic generating system and training platform, but the shortcoming of the platform is：Price is very expensive and output voltage be 220V or
380V, for non-electrical class colleges and universities and non-electrolyte water solution student, can not bear financial burden and the non-electrical class of costliness at all
Student experimenting safety requirements.
The content of the invention
It is an object of the invention to provide a kind of grid-connected photovoltaic power generation system experiment device for teaching of economic security, mesh is overcome
The various training platform complex structures of the preceding teaching experiment for photovoltaic generating system, price be high and security is poor, can not be in reality
The shortcoming being widely popularized in border teaching experiment and scientific research.
The present invention realizes above-mentioned purpose using following technical scheme.Grid-connected photovoltaic power generation system experiment device for teaching, including
Grid-connected photovoltaic power generation system and AC network simulation system, grid-connected photovoltaic power generation system include small-power photovoltaic array and grid-connected light
Inverter is lied prostrate, and small-power photovoltaic array passes through DC BUS（Dc bus）It is connected with grid-connected photovoltaic inverter；AC network mould
Plan system is by variable-frequency governor, GCU（Field regulator）, automobile current generator and AC load device composition, automobile current generator connect
Variable-frequency governor and GCU are connected to, automobile current generator passes through AC BUS（Ac bus）Respectively with grid-connected photovoltaic inverter and exchanging
Load device is connected.
Further, the grid-connected photovoltaic inverter includes DC boosting DCDC, decoupling capacitance, three phase inverter bridge, exchange filter
Ripple device, DCPWM drive circuits, AC/DCPWM drive circuits and MCU（Central controller）；Small-power photovoltaic array 11 passes through respectively
The voltage sensor of input is sequentially connected DC boosting DCDC, decoupling capacitance, three phase inverter bridge and exchanged with current sensor
Wave filter；Alternating current filter and the voltage sensor and current sensor of output end are connected；The voltage sensor and electricity of input
Flow sensor connects MCU by input voltage and input current detection means, and the voltage sensor and current sensor of output end pass through defeated
Go out voltage and current detecting device connection MCU；PWM mouths I in MCU connect DC boosting DCDC by DCPWM drive circuits；MCU
In PWM mouths II pass through AC/DCPWM drive circuits connect three phase inverter bridge；IPC passes through RS485 mouthfuls of connection MCU.
Variable-frequency governor is driving and the speed for controlling generator, allows generator to send 50Hz alternating current to simulate reality
The frequency of power network；GCU is mainly the excitation of control automobile current generator, it is therefore an objective to control the electricity of the three-phase electricity of automobile current generator output
Pressure amplitude value, automobile current generator sends phase voltage for 22V under the driving of variable-frequency governor and GCU co- controlling, and frequency is
50Hz three-phase alternating current, to simulate actual phase voltage 220V, frequency is 50Hz three-phase alternating current power network.
The present invention solves traditional grid-connected photovoltaic power generation system teaching experiment platform and training platform complex structure, price are high
The problem such as expensive, security is poor, the TMS320LF2407 chips by the use of high-precision low cost can complete multiple as central controller
Miscellaneous MPPT control algolithms, sinusoidal pulse width modulation pulse generating algorithm and synchronous cutting-in control algorithm etc., can be simulated simultaneously completely
Net photovoltaic generating system Generation Control proof of algorithm at different operating conditions and test performance requirement.By reducing and simulating
Grid-connected photovoltaic power generation system running status and control algorithm validation and test under difficult environmental conditions, so as to be photovoltaic generation system
System optimal control, MPPT tracking and fail-safe analysis experimental center provide platform and foundation.And the present invention's is grid-connected
Photovoltaic generation experiment device for teaching, investment is at most also only the ten of traditional grid-connected photovoltaic experiment porch and training platform R ＆ D Cost
1/5th or so, operating cost is low and safe and reliable, meets colleges and universities and scientific research institutions to grid-connected photovoltaic power generation teaching experiment
Economy and security requirement.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention；
Fig. 2 is the system schematic of grid-connected photovoltaic inverter 12 in the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.Referring to Fig. 1 and Fig. 2, grid-connected photovoltaic hair
Electric system experiment device for teaching, including grid-connected photovoltaic power generation system 1 and AC network simulation system 2, it is characterised in that：Grid-connected light
Photovoltaic generating system 1 includes small-power photovoltaic array（Solar panel）11 and grid-connected photovoltaic inverter 12, and small-power photovoltaic
Array（Solar panel）11 pass through DC BUS（Dc bus）It is connected with grid-connected photovoltaic inverter 12, grid-connected photovoltaic inverter
The 12 0-34V DC voltages for exporting photovoltaic array are under MCU 111 control, by DC boosting DCDC102, decoupling capacitance
103rd, 22V three-phase alternating current is exported after three phase inverter bridge 104 and alternating current filter 105, it realizes the inversion of photovoltaic generation
Function；AC network simulation system 2 is by variable-frequency governor 21, GCU（Field regulator）23rd, automobile current generator 22 and AC load
Device 24 is constituted, and automobile current generator 22 is connected with variable-frequency governor 21 and GCU 23, and automobile current generator 22 passes through AC BUS（Exchange
Bus）It is connected respectively with grid-connected photovoltaic inverter 12 and AC load device 24；Variable-frequency governor 21 is that driving and control generate electricity
The speed of machine, allows generator to send 50Hz alternating current to simulate the frequency of actual electric network；GCU 23 mainly controls automobile hair
The excitation of motor, it is therefore an objective to control the voltage magnitude of the three-phase electricity of automobile current generator output, automobile current generator 22 is in frequency control
Phase voltage is sent for 22V under the driving of device 21 and GCU 23 co- controlling, and frequency is 50Hz three-phase alternating current, to simulate reality
Border phase voltage 220V, frequency is 50Hz three-phase alternating current power network；
（As shown in Figure 2）The grid-connected photovoltaic inverter 12 includes DC boosting DCDC102, decoupling capacitance 103, three phase inverter bridge
104th, alternating current filter 105, DCPWM drive circuits 108, AC/DCPWM drive circuits 109 and MCU（TMS320LF2407 centers
Controller）111；Small-power photovoltaic array（Solar panel）11 pass through the voltage sensor 101 and electric current of input respectively
Sensor 100 is sequentially connected DC boosting DCDC102, decoupling capacitance 103, three phase inverter bridge 104 and alternating current filter 105；Hand over
Stream wave filter 105 is connected with the voltage sensor 101 and current sensor 100 of output end；The He of voltage sensor 101 of input
Current sensor 100 connects MCU 111, the voltage sensor 101 and electricity of output end by input voltage and input current detection means 106
Flow sensor 100 connects MCU 111 by output voltage current sensing means 107；PWM mouths I in MCU 111 pass through DCPWM
The connection DC boosting of drive circuit 108 DCDC102；PWM mouths II in MCU 111 are connected by AC/DCPWM drive circuits 109
Three phase inverter bridge 104；IPC 110（Background monitoring computer）Pass through RS485 mouthfuls of connection MCU 111.Background monitoring Computer IP C
110 are provided with the grid-connected photovoltaic power generation system monitoring software V2.1 of VB6.0 exploitations, and the software is responsible for display and passed through by MCU 111
The photovoltaic generating system real time execution parameter that RS485 oral instructions come, such as：Grid-connected current, voltage, frequency, active power, reactive power
Etc. various operational factors.
The dc voltage boost for the 0-34V changes that the DC boosting DCDC102 exports small-power photovoltaic array 11 is simultaneously
Stabilize to 36V DC voltages；The decoupling capacitance 103 is the decoupling for realizing direct current and alternating voltage, is easy to alternating current-direct current control；Institute
State three-phase commutation bridge 104 be by DC voltage inversion be required three-phase alternating current；The alternating current filter 105 realizes exchange
Alternating current beyond filter function, the power frequency that three phase inverter bridge 104 is exported is filtered；The input, output voltage sensor 101
Sample the parameter of input ac voltage electric current and output DC voltage and current, and send respectively with input, output current sensor 102
To MCU（TMS320LF2407 central controllers）111 realize control in real time；DCPWM drive circuits 108, DC/ACPWM driving electricity
Realize the amplification to the output signals of MCU 111 and then respectively control DC boosting DCDC102 and three phase inverter bridge 104 in road 109；
MCU 111 realizes complex control algorithms of high performance.Physical circuit is connected as：The 0-34V changes that small-power photovoltaic array 11 is exported
DC voltage as combining inverter DC（Direct current）Input voltage, its direct and DC boosting DCDC102 connection, while its
Also it is connected with voltage sensor 101 and current sensor 102, it is therefore an objective to measure input direct voltage and size of current；Direct current liter
Pressure DCDC102 is also connected with DCPWM drive circuits 108 with decoupling capacitance 103 simultaneously, and DC boosting DCDC102 drives in DCPWM
It is about 36V that DC voltage is exported under the control of circuit 108, and the voltage is connected to three contraries after the voltage stabilizing of decoupling capacitance 103
Become bridge 104, three phase inverter bridge 104 is also connected with DC/ACPWM drive circuits 109 simultaneously, in DC/ACPWM drive circuits 109
The lower three phase inverter bridge 104 of control, which is exported, relatively stablizes three-phase alternating voltage, and the output of three phase inverter bridge 104 is connected to alternating current filter
105, the outputting standard 50Hz stable three-phase sine wave voltage after its filtering, background monitoring Computer IP C110 passes through
RS485 mouthfuls and MCU（TMS320LF2407）111 central controllers are connected, and realize real-time communication, record and show various control ginsengs
Number.
In order to effectively realize the economy, reliability and security of grid-connected photovoltaic power generation system, the present apparatus using it is low into
This small-power photovoltaic array 11 uses low-power consumption, low price as input, DC boosting DCDC102 and three phase inverter bridge 104
The high frequency metal-oxide-semiconductor of lattice, MCU（TMS320LF2407）111 central processing units use the TMS320LF2407 of the TI companies of low cost
Chip；The simulating grid of AC network simulation system 2 is used forms three-phase 21V alternating currents by the automobile current generator transformation of low cost
Net, frequency 50Hz.The experiment device for teaching of the present invention does not only have higher static accuracy, also to there is good dynamic characteristic, energy
The various control algolithms of Based Intelligent Control and principle of photovoltaic generating system are enough fully achieved, while being also contemplated for the person peace of student experimenting
The security of full property and equipment, is that experimental center and the high performance photovoltaic generation system optimizing control of exploitation provide necessary
Means of testing and corresponding inexpensive hardware experiments device.
Small-power photovoltaic array（Solar panel）11 as photovoltaic generating system dc source, its output voltage and
Electric current changes with the change of light intensity and environment temperature, and its voltage range exported is 0-34V；Combining inverter 12 is by direct current
Boost DC/DC 102, decoupling capacitance 103, three phase inverter bridge 104 and alternating current filter 105 are constituted, DC boosting DCDC102 by
, will be small under control of the frequency for the pid control algorithm generation being integrated in TMS320LF2407 for 10KHz pulse-width signal
Power photovoltaic array 11 export 0-34V change dc voltage boost to stably 36V direct currents, then by decoupling capacitance after
The inversion of three phase inverter bridge 105 is supplied, this level realizes MPPT maximum power point tracking simultaneously（MPPT）；The function of three phase inverter bridge 105 is
Realization is by the three phase sine alternating current that stable 36V DC conversions are that phase voltage is 22V, and the process of implementing is central processing
Device TMS320LF2407 real-time tracking DC bus-bar voltage sizes and mains frequency, further according to foundation in TMS320LF2407
Sinusoidal pulse width modulation control algolithm, produces six road pulse-width signals of corresponding dutycycle, and electricity is driven through extra pulse DC/ACPWM
Three phase inverter bridge 105 is driven behind road 109, three phase inverter bridge 104 is exported after alternating current filter 105, makes three phase inverter bridge 104
The output three phase sine electric current synchronous with simulating grid.The 0-34VDC produced from small-power photovoltaic array 11 is as being input to most
Metastable three-phase alternating current electricity output afterwards, whole circuit for power conversion and control the hardware structure of circuit simple, economical and
It is reliable.
MCU in experimental provision（TMS320LF2407）111 central controllers are completed to output AC voltage, electric current, defeated
Enter the detection and conversion of DC voltage, detection in real time and the input power of calculating small-power photovoltaic array 11 and grid-connected output work
Rate, according in MCU（TMS320LF2407）The maximum power point algorithm set up inside 111 central controllers（MPPT）Model and just
String pulse width modulation algorithm model, then intelligent fuzzy computing is carried out to error and error rate by Fuzzy PID, it is real
When calculate PWM dutycycle, the control signal with corresponding dutycycle of output is passed through into DCPWM drive circuits 108, DC/
ACPWM drive circuits 109 drive DC voltage booster circuit DCDC102 and three phase inverter bridge 104 respectively after amplifying, and make three phase inverter bridge
The three-phase sine-wave electric current of 104 outputting high qualities, while realizing MPPT maximum power point tracking, particular circuit configurations realize such as Fig. 2.
Claims (2)
1. grid-connected photovoltaic power generation system experiment device for teaching, including grid-connected photovoltaic power generation system and AC network simulation system, its
It is characterised by, grid-connected photovoltaic power generation system includes small-power photovoltaic array and grid-connected photovoltaic inverter, and small-power photovoltaic array
It is connected by DC BUS with grid-connected photovoltaic inverter；AC network simulation system by variable-frequency governor, GCU, automobile current generator and
AC load device is constituted, and automobile current generator is connected with variable-frequency governor and GCU, automobile current generator by AC BUS respectively with
Grid-connected photovoltaic inverter and the connection of AC load device.
2. grid-connected photovoltaic power generation system experiment device for teaching according to claim 1, it is characterised in that the grid-connected photovoltaic
Inverter includes DC boosting DCDC, decoupling capacitance, three phase inverter bridge, alternating current filter, DCPWM drive circuits, AC/DCPWM
Drive circuit and MCU；Small-power photovoltaic array is sequentially connected directly by the voltage sensor and current sensor of input respectively
Flow boost DC/DC, decoupling capacitance, three phase inverter bridge and alternating current filter；The voltage sensor and electricity of alternating current filter and output end
Flow sensor is connected；The voltage sensor and current sensor of input connect MCU by input voltage and input current detection means, defeated
The voltage sensor and current sensor for going out end connect MCU by output voltage current sensing means；PWM mouths I in MCU pass through
DCPWM drive circuits connection DC boosting DCDC；PWM mouths II in MCU connect three-phase inversion by AC/DCPWM drive circuits
Bridge；IPC passes through RS485 mouthfuls of connection MCU.
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| CN109949672A (en) * | 2019-04-29 | 2019-06-28 | 南昌航空大学 | Photovoltaic array simulator experiment device for teaching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109949672A (en) * | 2019-04-29 | 2019-06-28 | 南昌航空大学 | Photovoltaic array simulator experiment device for teaching |
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