CN103116118A - Digital photovoltaic array imitator system based on look-up table - Google Patents
Digital photovoltaic array imitator system based on look-up table Download PDFInfo
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Abstract
The invention provides a digital photovoltaic array imitator system based on a look-up table. The digital photovoltaic array imitator system comprises a buck chopper (BUCK circuit) with a synchronous rectification method; the BUCK circuit is connected with an output end of a controller through a signal conditioning module, the output end of the controller is connected with an input end of a metal-oxide semiconductor field effect tube (MOSFET) driver module, and an output end of the MOSFET driver module is connected with the BUCK circuit; a power supply module is connected with the signal conditioning module, the controller and the MOSFET driver module, and a load resistance is connected with the signal conditioning module. The digital photovoltaic array imitator system overcomes defects in the prior art, can assist people to do researches for photovoltaic power generation system all day long, has high capacity usage ratio, can realize online replacement of photovoltaic characteristic curve, and has the advantages of high power, small volume and low storage cost.
Description
Technical field
The present invention relates to a kind of digital photovoltaic array simulation system based on look-up table, belong to the photovoltaic power generation technology field.
Background technology
Photovoltaic generation is one of current major way that utilizes sun power, is also the focus of research.Photovoltaic array is sun power to be converted to the device of electric energy, is extremely important component parts in photovoltaic generating system.The quality of photovoltaic array directly has influence on the size of photovoltaic generating system generated energy.
The operating characteristic of photovoltaic array under different sunshines and environment temperature has very big-difference, and namely its output power presents obvious nonlinear characteristic with parameters such as intensity of sunshine, environment temperatures.With open-circuit voltage 40V, short-circuit current 3.5A, the photovoltaic cell of maximum power point 33V, 3A are example, and its photovoltaic property curve as shown in Figure 1.Therefore, for the output with the photovoltaic array battery is converted to reliable and stable electric energy, photovoltaic generating system must have this nonlinear " round-the-clock " ability of adaptation.Yet in physical environment, the conditions such as intensity of sunshine and temperature obviously all can change because of the factor such as time, season, geographic position at any time.If so adopt actual photovoltaic array in experiment, not only with high costs, more can make experimental result inaccurate because of the restriction of infield, experimental period, experimental facilities reach required rated power, can not meet to carry out " round-the-clock " requirement of experiment continuously yet.In order to solve the problem that in experiment, photovoltaic array is retrained by natural conditions, the concept of photovoltaic array simulator has been proposed.
Existing photovoltaic array simulator mainly is divided into analog and digital.Analog photovoltaic array simulator mainly is based on the simulator of sample photovoltaic cell, it utilizes imitates light irradiation photovoltaic array at sunshine, sample photovoltaic cell output voltage and electric current change with the simulation light intensity, voltage and current is through amplifying the rear drive power device, make its output follow the voltage of sample photovoltaic cell, electric current, replace the actual light photovoltaic array to test.Digital photovoltaic array simulator is mainly to utilize the control of the controllers such as digital signal processor (DSP) or single-chip microcomputer to make output voltage, electric current satisfy the nonlinear switching power supply of photovoltaic property curve.
Existing photovoltaic array simulator capacity usage ratio is lower, and existing photovoltaic array simulator is to realize the change of photovoltaic property curve by the method for many curve datas of storage, this method needs a large amount of storage spaces, to such an extent as to want outer extension memory, increases carrying cost.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of capacity usage ratio high, can carry out photovoltaic generating system research and the low digital photovoltaic array simulation system based on look-up table of carrying cost round-the-clockly.
In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide a kind of digital photovoltaic array simulation system based on look-up table, it is characterized in that: with the buck circuit (BUCK circuit) of synchronous rectification, the BUCK circuit connects the controller input end by the signal condition module, controller output end connection metal oxide semiconductor field effect pipe (MOSFET) driver module input end, MOSFET driver module output terminal connects the BUCK circuit; The power supply module connects signal condition module, controller and MOSFET driver module, and pull-up resistor connects the signal condition module.
Preferably, described BUCK circuit with synchronous rectification comprises input power, the positive pole of input power connects the drain electrode of the first field effect transistor, the negative pole of input power connects the source electrode of the second field effect transistor, an end and the described signal condition module of filter capacitor, the source electrode of the first field effect transistor connects the drain electrode of the second field effect transistor and an end of filter inductance, the other end of filter inductance connects the other end and the described signal condition module of filter capacitor, the grid of the first field effect transistor be connected the grid of field effect transistor and all connect described MOSFET driver module.
preferably, described signal condition module comprises Hall element, the first pin of Hall element connects described pull-up resistor one end, the described pull-up resistor other end connects the negative pole of the second divider resistance one end and described input power, the second divider resistance other end connects the voltage sample end of the first divider resistance one end and described controller, the first divider resistance other end connects the other end of described filter inductance and the 3rd pin of Hall element, the output terminal of Hall element connects the current sample end of described controller, Hall element also connects described power supply module.
Preferably, described controller comprises proportion integration differentiation (PID) regulator, utilize voltage sample value that the voltage sample end obtains to look into the given value of current value of photovoltaic property table gained and the error signal of the current sampling data that described current sample end obtains is connected to PID regulator input end, the PID conditioner outlet end connects pulsewidth (PWM) generator input end, and the PWM generator output terminal connects described MOSFET driver module input end.
a kind of digital photovoltaic array simulation system based on look-up table provided by the invention with embedded system as core devices, main circuit adopts the BUCK translation circuit with synchronous rectification, crucial photovoltaic property curve is to adopt the off-line type computing machine to calculate, the corresponding numerical value of discrete electric current and voltage with correspondence after namely calculating on computers imports in controller, voltage with main circuit output, electric current is through after signal conditioning circuit, sampling is input in controller, table look-up according to the voltage signal correspondence that samples and to obtain corresponding current reference signal, and the error signal of the current signal of this current reference signal and sampling is used for controlling output, thereby realize the simulation to the photovoltaic array battery.
Compared to existing technology, the beneficial effect of a kind of digital photovoltaic array simulation system based on look-up table provided by the invention is as follows:
(1) due to the method for having used synchronous rectification, make the capacity usage ratio of this system higher than general simulator, can carry out photovoltaic generating system research, and power is larger round-the-clockly;
(2) adopt the method for online change curve, only need the capacity of two curve datas of storage to get final product, volume is little a lot of than photovoltaic cell, and capacity usage ratio is high, can substitute online the photovoltaic property curve, and the simultaneity factor carrying cost is lower.
System provided by the invention has overcome the deficiencies in the prior art, can carry out photovoltaic generating system research round-the-clockly, and capacity usage ratio is high, can substitute online the photovoltaic property curve, has the advantages that power is large, volume is little and carrying cost is low.
Description of drawings
Fig. 1 is the photovoltaic property curve synoptic diagram;
Fig. 2 is a kind of digital photovoltaic array simulation system block diagram based on look-up table provided by the invention;
Fig. 3 is a kind of digital photovoltaic array simulation system circuit theory diagrams based on look-up table provided by the invention.
Embodiment
For the present invention is become apparent, hereby with a preferred embodiment, and coordinate accompanying drawing to be described in detail below.
Fig. 2 is a kind of digital photovoltaic array simulation system block diagram representation based on look-up table provided by the invention, the main circuit of described a kind of digital photovoltaic array simulation system based on look-up table is the BUCK circuit that adopts with synchronous rectification, the BUCK circuit connects the controller input end by the signal condition module, controller output end connects MOSFET driver module input end, and MOSFET driver module output terminal connects the BUCK circuit; The power supply module connects signal condition module, controller and MOSFET driver module, and pull-up resistor R3 connects the signal condition module.
in conjunction with Fig. 3, BUCK circuit with synchronous rectification comprises input power E, the positive pole of input power E connects the drain electrode of the first field effect transistor Q1, the negative pole of input power E connects the source electrode of the second field effect transistor Q2, the end of filter capacitor C1 and described signal condition module, the source electrode of the first field effect transistor Q1 connects the drain electrode of the second field effect transistor Q2 and the end of filter inductance L1, the other end of filter inductance L1 connects the other end and the described signal condition module of filter capacitor C1, the grid of the first field effect transistor Q1 be connected the grid of field effect transistor Q2 and all connect described MOSFET driver module.
The first field effect transistor Q1, the second field effect transistor Q2 select is the IRF840 that IR company produces.
receive the signal conditioning module after the output of BUCK circuit, the signal condition module comprises Hall element P1, the first pin of Hall element P1 connects pull-up resistor R3 one end, the pull-up resistor R3 other end connects the negative pole of the second divider resistance R2 one end and described input power E, the second divider resistance R2 other end connects the voltage sample end of the first divider resistance R1 one end and described controller, the first divider resistance R1 other end connects the other end of described filter inductance L1 and the 3rd pin of Hall element P1, the output terminal of Hall element P1 connects the current sample end of described controller, Hall element P1 also connects described power supply module.
Hall element P1 is the ACS712ELCTR-05B that Allegro company produces, current signal can be converted to AD (analog to digital conversion) and can accept 0～3.3V, two divider resistance R1, R2 are controlled at 0～3.3V with magnitude of voltage, then carry out the AD sampling of output voltage electric current.
Controller is the TQ2440 development board that adopts sky embedding company to produce, and the concrete model of microprocessor is the ARM9 processor S3C2440 of Samsung.This processor has 8 passage AD samplings, and the voltage and current sample end with the signal condition module is connected with passage 1 with passage 0 respectively.Passage 0 obtains the given value of current signal through looking into the photovoltaic property table, the given value of current signal is connected PID regulator input end with the error signal of passage 1, the PID conditioner outlet end connects PWM generator, the PWM ripple that PWM generator produces is as the control signal of MOSFET driver module, and this signal is received in the MOSFET driving circuit.
The driving chip that the MOSFET driver module is corresponding is selected is the IR2117 that IR company produces, the driver module output terminal connects the BUCK circuit, the switch of controlling field effect transistor with the pwm signal after the conversion of MOSFET driver module carries out closed loop adjustment, makes the voltage of photovoltaic array simulator output and the output characteristics that electric current satisfies the photovoltaic array battery.
The power supply module is the L4978 chip of ST Microelectronics's production preferably, and the power supply module is connecting controller module, MOSFET driver module and signal condition module.
During use, photovoltaic DC-to-AC converter or pull-up resistor R3 are connected with the BUCK circuit.At first, calculate needed photovoltaic property curve on ordinary PC, the photovoltaic property curve satisfies following equation:
C
2＝(V
m/V
oc-1)[ln(1-I
m/I
sc)]
-1
Wherein, I
sc, V
oc, I
m, V
m, I
L, V
LRepresent respectively short-circuit current, open-circuit voltage, corresponding voltage, output current and the output voltage of electric current, maximum power point that maximum power point is corresponding, C
1, C
2Be the pilot process parameter.
Utilize the method for numerical evaluation on PC, with voltage discretize equably, according to above-mentioned equation, the technical parameter that substitution is corresponding, can try to achieve the discrete value of electric current, with the voltage that obtains, round values corresponding to AD that the electric current discrete value converts 10 precision to, with these two groups of AD values respectively the corresponding photovoltaic property table that becomes the form of 2 groups of arrays be stored in S3C2440 controller sheet in random access memory (RAM), search in order to control.
the voltage AD value that sampling obtains is searched the voltage AD array of corresponding stored in RAM, AD reference value according to the voltage value corresponding current, this electric current AD reference value is carried out PID with the difference of the AD sampled value of reality as error signal regulates, by producing the PWM ripple as the control signal of MOSFET driver module, this signal is received in the MOSFET driving circuit, through IR2117, driving voltage is transformed to 15V, control field effect transistor Q1 with the pwm signal after conversion, the switch of Q2 carries out closed loop adjustment, make the voltage of photovoltaic array simulator output and the output characteristics that electric current satisfies the photovoltaic array battery.Because general fly-wheel diode is selected the schottky diode of tube voltage drop minimum and also had the on-state tube voltage drop of 0.6V at least, and the On-resistance of field effect transistor is generally 10 milliohms left and right, therefore replace schottky diode can reduce switching loss with the field effect pipe belt.If realize the change of photovoltaic property curve, that new photovoltaic property curve is sent in the RAM of development board through serial ports, after fully receiving, carry out again the replacement of photovoltaic curve, so just do not need to store many curve datas, but utilize the online method that substitutes curve, realize the change of photovoltaic property curve.
A kind of digital photovoltaic array simulation system based on look-up table provided by the invention is take the photovoltaic cell model as the basis, by controller and Technics of Power Electronic Conversion device, can carry out photovoltaic generating system research round-the-clockly, and power is larger, volume is little a lot of than photovoltaic cell, capacity usage ratio is high, can substitute online the photovoltaic property curve, and its system storage expense is little.
Claims (4)
1. digital photovoltaic array simulation system based on look-up table, it is characterized in that: comprise the buck circuit (BUCK circuit) with synchronous rectification, the BUCK circuit connects the controller input end by the signal condition module, controller output end connection metal oxide semiconductor field effect pipe (MOSFET) driver module input end, MOSFET driver module output terminal connects the BUCK circuit; The power supply module connects signal condition module, controller and MOSFET driver module, and pull-up resistor (R3) connects the signal condition module.
2. a kind of digital photovoltaic array simulation system based on look-up table as claimed in claim 1, it is characterized in that: described BUCK circuit with synchronous rectification comprises input power (E), the positive pole of input power (E) connects the drain electrode of the first field effect transistor (Q1), the negative pole of input power (E) connects the source electrode of the second field effect transistor (Q2), one end of filter capacitor (C1) and described signal condition module, the source electrode of the first field effect transistor (Q1) connects the drain electrode of the second field effect transistor (Q2) and an end of filter inductance (L1), the other end of filter inductance (L1) connects the other end and the described signal condition module of filter capacitor (C1), the grid of the first field effect transistor (Q1) be connected the grid of field effect transistor (Q2) and all connect described MOSFET driver module.
3. a kind of digital photovoltaic array simulation system based on look-up table as claimed in claim 2, it is characterized in that: described signal condition module comprises Hall element (P1), the first pin of Hall element (P1) connects described pull-up resistor (R3) end, described pull-up resistor (R3) other end connects the negative pole of the second divider resistance (R2) end and described input power (E), the second divider resistance (R2) other end connects the voltage sample end of the first divider resistance (R1) end and described controller, the first divider resistance (R1) other end connects the other end of described filter inductance (L1) and the 3rd pin of Hall element (P1), the output terminal of Hall element (P1) connects the current sample end of described controller, Hall element (P1) also connects described power supply module.
4. a kind of digital photovoltaic array simulation system based on look-up table as claimed in claim 3, it is characterized in that: described controller comprises proportion integration differentiation (PID) regulator, utilize voltage sample value that the voltage sample end obtains to look into the given value of current value of photovoltaic property table gained and the error signal of the current sampling data that described current sample end obtains is connected to PID regulator input end, the PID conditioner outlet end connects pulsewidth (PWM) generator input end, and the PWM generator output terminal connects described MOSFET driver module input end.
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Cited By (7)
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| CN103365234A (en) * | 2013-08-13 | 2013-10-23 | 中国电子科技集团公司第四十一研究所 | Voltage controlled current signal generator of solar cell array simulator |
| CN104821726A (en) * | 2015-04-02 | 2015-08-05 | 桂林电子科技大学 | Electron beam welding machine power supply high-voltage voltage stabilization method and method employing micro ripper Cuk type converter |
| CN106712527A (en) * | 2017-03-29 | 2017-05-24 | 天津瑞能电气有限公司 | Isolated type photovoltaic array simulator system based on calculation method |
| CN107196545A (en) * | 2016-09-08 | 2017-09-22 | 湘潭大学 | Photovoltaic grid-connected three-level inverter control Optimization Platform based on Molecule Motion Theory |
| CN110703835A (en) * | 2019-10-10 | 2020-01-17 | 深圳市航天新源科技有限公司 | I-V outer loop control method applied to solar cell array simulator |
| CN111240393A (en) * | 2020-03-19 | 2020-06-05 | 深圳市高斯宝电气技术有限公司 | Control method for simulating output characteristics of photovoltaic cell panel |
| CN111368438A (en) * | 2020-03-06 | 2020-07-03 | 中国矿业大学 | Energy simulation system and device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103365234A (en) * | 2013-08-13 | 2013-10-23 | 中国电子科技集团公司第四十一研究所 | Voltage controlled current signal generator of solar cell array simulator |
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| CN107196545A (en) * | 2016-09-08 | 2017-09-22 | 湘潭大学 | Photovoltaic grid-connected three-level inverter control Optimization Platform based on Molecule Motion Theory |
| CN106712527A (en) * | 2017-03-29 | 2017-05-24 | 天津瑞能电气有限公司 | Isolated type photovoltaic array simulator system based on calculation method |
| CN106712527B (en) * | 2017-03-29 | 2023-09-29 | 天津瑞能电气有限公司 | Isolated photovoltaic array simulator system based on calculation method |
| CN110703835A (en) * | 2019-10-10 | 2020-01-17 | 深圳市航天新源科技有限公司 | I-V outer loop control method applied to solar cell array simulator |
| CN111368438A (en) * | 2020-03-06 | 2020-07-03 | 中国矿业大学 | Energy simulation system and device |
| CN111240393A (en) * | 2020-03-19 | 2020-06-05 | 深圳市高斯宝电气技术有限公司 | Control method for simulating output characteristics of photovoltaic cell panel |
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Application publication date: 20130522 |