CN102175944A - Photovoltaic grid-connected inverter test bench - Google Patents
Photovoltaic grid-connected inverter test bench Download PDFInfo
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- CN102175944A CN102175944A CN201110043797XA CN201110043797A CN102175944A CN 102175944 A CN102175944 A CN 102175944A CN 201110043797X A CN201110043797X A CN 201110043797XA CN 201110043797 A CN201110043797 A CN 201110043797A CN 102175944 A CN102175944 A CN 102175944A
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Abstract
The invention belongs to the technical field for testing photovoltaic grid-connected inverters, in particular to a test bench for testing various performance indexes of a photovoltaic grid-connected inverter. The test bench uses a photovoltaic battery array simulating power supply as the input source of the inverter so to displace the original real photovoltaic battery array, and uses a grid characteristic stimulating power supply to displace a large-power resistor load. The photovoltaic battery array simulating power supply can set the needed weather conditions like illumination, environment temperature, wind speed and the like conveniently, output a V-I (voltage-current) curve conforming to the requirements, and overcome the shortages that the real photovoltaic battery array has multiple uncontrollable factors and the installation and maintenance are not convenient. The grid characteristic stimulating power supply can simulate the characteristics like a grid voltage, a frequency, background harmonic waves and the like, can detect the working performances of the inverter under different grid states, and can feed back the output electric energy of the inverter to a public grid, so that the electric energy loss is reduced.
Description
Technical field
The invention belongs to the photovoltaic combining inverter technical field of measurement and test, be specifically related to a photovoltaic combining inverter test platform.
Background technology
In lack of energy and environmental pollution serious day by day today, photovoltaic power generation technology has become the new energy technology that countries in the world fall over each other to develop.And photovoltaic combining inverter is as the core component in the photovoltaic generating system, and its property relationship is to utilization factor, reliability and the power supply quality of photovoltaic system.Therefore need a comprehensive test platform, can detect every performance index of combining inverter, guarantee that the performance of inverter meets relevant criterion.
But when at present inverter being tested, the input source of inverter adopts real photovoltaic battery array or DC simulation power supply usually, can bring like this such as various uncontrollable factors such as illumination condition, environment temperature, wind speed, simultaneously real photovoltaic array cost height, the big installation and maintenance of floor area are very inconvenient; The load of inverter outgoing side adopts high-power resistance and AC voltage-stabilizing source to form usually, the serviceability of combining inverter under different grid voltage waveform states can be simulated in the AC voltage-stabilizing source, but this device is a voltage source, on circuit structure and design framework, can not in an equipment, realize two-way four-quadrant current source and voltage source duty simultaneously, the output electric energy inversion of inverter can't be sent into electrical network, but directly consume by resistance, cause very big waste of energy so on the one hand, can not detect the performance under the four-quadrant operation state of current/voltage between photovoltaic combining inverter and the electrical network on the other hand.
Summary of the invention
The object of the present invention is to provide a kind of photovoltaic combining inverter test platform.
The photovoltaic combining inverter test platform that the present invention proposes, concrete structure is as follows:
1) photovoltaic battery array analog power 1, be used for according to testing software instruction and weather status command, the direct current that satisfies specific V-I curve output is provided, response speed is less than 20ms, for providing the photovoltaic array direct current of simulation, exports by tested inverter, to detect the working condition of inverter under true environment;
2) tested inverter 2;
3) electrical network simulated behavior power supply 3, be used to simulate features such as line voltage, frequency, background harmonics, reach the purpose that detects the serviceability of inverter under different electric network states, can realize simultaneously the two-way flow of electric current, insert electrical network moment at inverter, provide the voltage source effect, the current direction combining inverter; After the combining inverter generating started, electric current was gone into electrical network by 3 loopbacks of electric network state simulated behavior power supply;
4) anti-island detection device 4 is used for tested inverter 2 and whether has the isolated island defencive function;
5) a cover man-machine interactive operation system 5 is used to receive every detection instruction that operating personnel send, and can moves on request according to this instruction control photovoltaic battery array analog power, electrical network simulated behavior power supply and anti-island detection device.
Wherein: the output terminal of photovoltaic battery array analog power 1 connects the input end of tested inverter 2, the output terminal of tested inverter 2 connects electrical network simulated behavior power supply 3 and anti-island detection device 4 respectively, anti-island detection device 4 connects man-machine interactive operation system 5, man-machine interactive operation system 5 connects photovoltaic battery array analog power 1 and electrical network simulated behavior power supply 3 respectively, and electrical network simulated behavior power supply 3 output terminals connect photovoltaic battery array analog power 1 input end by public electric wire net.
Among the present invention, described photovoltaic battery array analog power 1 is connected to form by three phase controlled rectifier circuit and buck circuit, and adopts the SVPWM control algolithm.
Among the present invention, described electrical network simulated behavior power supply 3 is made up of three phase controlled rectifier circuit, three-phase inverting circuit and LC high frequency filter.
Test platform of the present invention uses the input source of photovoltaic battery array analog power as inverter, has replaced original real photovoltaic battery array; Use electrical network simulated behavior power supply to replace high-power resistance load and AC voltage-stabilizing source.The photovoltaic battery array analog power can be provided with weather conditions such as required illumination, environment temperature, wind speed easily, exports satisfactory V-I curve, and it is many to have overcome true photovoltaic battery array uncontrollable factor, the shortcoming of installation and maintenance inconvenience.Electrical network simulated behavior power supply can be simulated features such as line voltage, frequency, background harmonics, can detect the serviceability of inverter under the two-way four-quadrant operation state of power network current, electrical network simulated behavior power supply can also feed back to public electric wire net with the output electric energy of inverter in addition, has reduced electric energy loss.
Description of drawings
Fig. 1 is a system architecture diagram of the present invention.
Fig. 2 is an electrical schematic diagram of the present invention.
Number in the figure: 1 is the photovoltaic battery array analog power, and 2 is tested photovoltaic combining inverter, and 3 is electrical network simulated behavior power supply, and 4 are anti-island detection device, and 5 is man-machine interactive operating system.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is described in further detail.
Referring to Fig. 1～2, the present invention is made up of photovoltaic battery array analog power 1, electrical network simulated behavior power supply 3, anti-island detection device 4, man-machine interactive operation system 5 and tested photovoltaic combining inverter 2.Photovoltaic battery array analog power 1 is as the input source of tested inverter 2, photovoltaic battery array that is virtually reality like reality; The output terminal of electrical network simulated behavior power supply 3 and tested inverter 2 links to each other, and detects the characteristic that is incorporated into the power networks of inverter 2; Anti-island detection device 4 is by K switch 1(as shown in Figure 2) link to each other with tested inverter 2, be used to detect the isolated island protective value of inverter 2; Man-machine interactive operation system 5 is used for controlling each device, the acquisition testing data of test platform and shows testing result.
Photovoltaic battery array analog power 1 comprises, net side inductance L 1, three phase controlled rectifier circuit, buck circuit and the correspondent control circuits plate be made up of six power devices.Control circuit board is made up of dsp chip, voltage sensor, current sensor, temperature sensor and driving circuit.DSP exports corresponding PWM ripple according to the SVPWM control algolithm, controls turning on and off of six power devices, thereby realizes the unity power factor rectification.Used DSP adopts TI company's T MS320LF2812DSP; Power device adopts insulated gate bipolar transistor IGBT and corresponding driving circuit thereof, also can adopt power transistor GTR or Metal-oxide-semicondutor type field effect transistor M OSFET or gate turn off thyristor GTO.It is adjustable that terminal buck circuit becomes rectifier output voltage into 0-800V, thereby can be good at the output V-I curve of photovoltaic battery array that is virtually reality like reality.
Electrical network simulated behavior power supply 3 comprises, the three phase controlled rectifier circuit that three phase rectifier is formed with inductance L4, by six power devices, the three-phase inverting circuit of being made up of six power devices, high-frequency filter circuit and the correspondent control circuits plate be made up of L3 and C4.DSP controls three phase controlled rectifier circuit, and the output AC electricity of inverter is become direct current, by back level three-phase inversion, dc inverter is become three-phase alternating current simultaneously, through feeding back to electrical network after the high-frequency filter circuit filtering.
Man-machine interactive operation system 5 can with photovoltaic battery array analog power 1, anti-island detection device 4,3 communications of electrical network simulated behavior power supply; Can be provided with by human-computer interaction interface and detect action; The detection synchronizing signal can be provided, guarantee the real-time of detection system; Have data storage function, can preserve historical test data, and can be convenient and swift and representation of the historical data and image clearly.
Concrete principle of work of the present invention is:
Photovoltaic battery array analog power dsp controller according to the SVPWM control algolithm, is controlled turning on and off of six power devices, thereby will be converted to the direct current of 850V from the three-phase alternating current of electrical network input, and promptly capacitor C 1 both end voltage is 850V.The man-machine interactive operation system goes out photovoltaic battery array V-I family curve of (cloud, temperature, dust etc.) under current weather and environmental baseline according to data computation such as the open-circuit voltage of the photovoltaic battery array of operating personnel input, short-circuit current, maximum power point output voltage electric currents.Power device in the photovoltaic battery array analog power dsp controller control buck circuit makes the output voltage of buck circuit and electric current change in strict accordance with above-mentioned V-I family curve.Meanwhile, the man-machine interactive operation system detects the input voltage and the electric current of tested photovoltaic combining inverter in real time, calculate power input,, just can detect the MPPT maximum power point tracking performance of tested inverter the peak power output comparison of this power input and photovoltaic battery array.If the peak power output of this power input and photovoltaic battery array is close, illustrate that then the maximal power tracing of tested inverter is functional.
Electrical network simulated behavior power supply converts the output AC electricity of tested inverter to by three phase controlled rectifier circuit the direct current of 700V, this direct current converts alternating current to by three-phase inverting circuit again after capacitor C 3 filtering, feed back to public electric wire net after the high frequency filter filtering of this alternating current through L3 and C4 composition.Meanwhile, electrical network simulated behavior power supply DSP controller receives the detection instruction from the man-machine interactive operation system, the turning on and off of each power device in control rectified three-phase circuit and the three-phase inverting circuit, thereby the fluctuation of simulation line voltage, frequency.The man-machine interactive operation system constantly monitors the duty of tested inverter when line voltage, frequency jitter in whole process, thereby can detect the serviceability of tested photovoltaic combining inverter when line voltage, frequency generation fluctuation.
When needs detect inverter isolated island defencive function, at first disconnect K1, closed K2, make that the active power of tested inverter output and reactive power are the value of test regulation; Closed K1, send instruction by the man-machine interactive operation system to anti-island detection device, anti-island detection device instructs according to this, automatically adjust the size of inner resistive load, inductive load and capacitive load, absorbed by anti-island detection device fully up to active power and reactive power by tested inverter output; Then disconnect K2; be disconnected to the time T of tested inverter startup isolated island defencive function (being that tested inverter quits work) from K2 by the man-machine interactive operation system log (SYSLOG); if this time T meets the regulation of relevant criterion, then this tested inverter has good isolated island defencive function.
What native system was complete is integrated into an equipment with photovoltaic battery array simulation, electrical network simulated behavior, anti-three functions of island detection, can carry out the complete detection of complete combining inverter.
Claims (3)
1. photovoltaic combining inverter test platform is characterized in that being made up of following structure:
1) a photovoltaic battery array analog power (1) is used for the instruction according to testing software, and the direct current that satisfies specific V-I curve output is provided, and exports for tested inverter provides the photovoltaic array direct current of simulation, to detect the working condition of inverter under true environment;
2) a tested inverter (2);
2) an electrical network simulated behavior power supply (3) is used to simulate line voltage, frequency, background harmonics feature, and two-way current transformation is provided, and reaches the purpose that detects the serviceability of inverter under power network current and voltage four-quadrant state;
3) an anti-island detection device (4) is used to detect tested inverter 2 and whether has the isolated island defencive function;
4) a cover man-machine interactive operation system (5) is used to receive every detection instruction that operating personnel send, and can moves on request according to this instruction control photovoltaic battery array analog power, electrical network simulated behavior power supply and anti-island detection device;
Wherein: the output terminal of photovoltaic battery array analog power (1) connects the input end of tested inverter (2), the output terminal of tested inverter (2) connects electrical network simulated behavior power supply (3) and anti-island detection device (4) respectively, anti-island detection device (4) connects man-machine interactive operation system (5), man-machine interactive operation system (5) connects photovoltaic battery array analog power (1) and electrical network simulated behavior power supply (3) respectively, and electrical network simulated behavior power supply (3) output terminal connects photovoltaic battery array analog power (1) input end by public electric wire net.
2. photovoltaic combining inverter test platform as claimed in claim 1 is characterized in that, described photovoltaic battery array analog power (1) is connected to form by three phase controlled rectifier circuit and buck circuit, and adopts the SVPWM control algolithm.
3. photovoltaic combining inverter test platform as claimed in claim 1 is characterized in that, described electrical network simulated behavior power supply (3) is made up of three phase controlled rectifier circuit, three-phase inverting circuit and LC high frequency filter.
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Application publication date: 20110907 |