CN106787789A - Output voltage outer ring computational methods and device in the output power network outer shroud control of solar battery array simulator - Google Patents
Output voltage outer ring computational methods and device in the output power network outer shroud control of solar battery array simulator Download PDFInfo
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- CN106787789A CN106787789A CN201610993730.5A CN201610993730A CN106787789A CN 106787789 A CN106787789 A CN 106787789A CN 201610993730 A CN201610993730 A CN 201610993730A CN 106787789 A CN106787789 A CN 106787789A
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- current
- outer shroud
- output voltage
- output
- solar battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The present invention relates to the output voltage outer ring computational methods in the output power network outer shroud control of solar battery array simulator, DSP obtains given value of current I to be supplied to output current outer shroud or output current inner ring, to a according to current output voltage Vout_fb, through exponent arithmeticxComputing, index x is expanded into integer part p and fractional part q sums, so that axIt is decomposed into apWith aqProduct.On the one hand, the possibility of the value of integer part p is limited, and this is caused to apCan table look-up and draw；On the other hand, aqSum of products two kinds of computings of summation are decomposed into using Taylor series computing；Due to axIt is decomposed into apWith aqProduct, above-mentioned computing is without directly carrying out exponent arithmetic, you can finally draw axValue, only need to can be obtained by given value of current I using DSP operation.Step in the computational methods be given for the present invention, can set up functional module, be combined into functional module construction, mainly be realized by storing computer program in a computer-readable storage medium.
Description
Technical field
Outside the present invention relates to output voltage outer ring computational methods, more particularly to solar battery array simulator output power network
Output voltage outer ring computational methods in ring control.Step in the computational methods be given for the present invention, can set up function
Module, is combined into functional module construction, is mainly realized by storing computer program in a computer-readable storage medium.
Background technology
Solar battery array simulator is a kind of analog solar array static state and dynamic current voltage characteristic
The output current Iout of power source, i.e. solar battery array simulator needs to be exported according to PV characteristic curves, and existing calculating
The method of output current Iout is usually according to the current of solar battery array simulator using the stronger computer of operational capability
Output voltage Vout_fb, and then calculate PV characteristic curves.Given value of current I needs just be drawn through exponent arithmetic, and DSP cannot
Gauge index computing, therefore given value of current I can only be obtained come computing using computer, this undoubtedly increased equipment cost.
The content of the invention
Outside it is an object of the invention to provide the output voltage in the output power network outer shroud control of solar battery array simulator
Ring computational methods, exponent arithmetic therein can be in DSP operation.
The present invention provides the output voltage outer ring calculating side in the output power network outer shroud control of solar battery array simulator
Method, according to current output voltage Vout_fb, obtains given value of current I to be supplied to output current outer shroud or output through exponent arithmetic
Current inner loop, it is characterized in that, in the exponent arithmetic, to axComputing comprise the following steps：
Index x is expanded into integer part p and fractional part q sums, so that axIt is decomposed into apWith aqProduct count
Calculate, to a thereinpTable look-up drawing, to a thereinqThen drawn with Taylor series computing.
Wherein, logarithm operation is also included during above-mentioned given value of current I is obtained, in the logarithm operation, to right
Number function Taylor series computing draws.
Wherein, to apTable look-up in the step of drawing, integer part p expanded into 2 each nonnegative integer power sum,
So as to apThe product for being decomposed into 2 each nonnegative integer power is calculated, wherein, 2 nonnegative integer power system tables look-up and draws.
Step in the computational methods be given for the present invention, can set up functional module, be combined into functional module construction,
It is main to be realized by storing computer program in a computer-readable storage medium.
Beneficial effect：Output voltage outer ring meter in solar battery array simulator output power network outer shroud control of the present invention
Calculation method, DSP obtains given value of current I to be supplied to output current outer shroud according to current output voltage Vout_fb through exponent arithmetic
Or output current inner ring, above-mentioned exponent arithmetic is specially as digitlization：To axComputing, index x is expanded into integer part p
With fractional part q sums so that axIt is decomposed into apWith aqProduct.On the one hand, in certain interval, integer part p
The possibility of value be limited, this is caused to apCan table look-up and draw, without directly carrying out exponent arithmetic；On the other hand, aqProfit
Sum of products is decomposed into Taylor series computing to sue for peace two kinds of computings, without directly carrying out exponent arithmetic；Due to axIt is decomposed into apWith
aqProduct, the computing of the product is without directly carrying out exponent arithmetic --- without directly carrying out exponent arithmetic, you can final
Draw axValue, so as to without the stronger computer of operational capability, only need to can be obtained by given value of current I using DSP operation
To be supplied to output current outer shroud or output current inner ring, so as to realize rapid computations with relatively low equipment cost.
Brief description of the drawings
Using accompanying drawing, the invention will be further described, but embodiment in accompanying drawing is not constituted to any limit of the invention
System, for one of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to the following drawings
Other accompanying drawings.
Fig. 1 is the structural representation of solar battery array simulator.
Fig. 2 is the control loop block diagram of solar battery array simulator.
Fig. 3 is the software control flow chart of solar battery array simulator.
Specific embodiment
The invention will be further described with the following Examples.
The structural representation of solar battery array simulator, as shown in figure 1, including three-phase alternating current input wires terminal
Ua, Ub, Uc, three-phase alternating current are input into through fuse F1, F2 and F3 connecting integration secondary Split type twelve-pulse transformer T.For
Cost-effective and reduction volume, wherein transformer T includes three larger leakage inductances Li1, Li2 and Li3, as twelve-pulse
The input inductance of rectification PFC.Two secondary output of transformer T is respectively connected to three-phase bridge rectification circuit VD1 and VD2, and
The output cascade of three-phase bridge rectification circuit VD1 and VD2 is connected and is exported, as the input of rear class DC/DC.To filter ten
The discharge resistance R1 of two impulse commutation voltage ripples, the larger filter capacitor C1 of palpus access, and parallel filtering electric capacity C1.Rectification
Voltage carries out DC/DC copped wave outputs by three-phase half-bridge H1, H2, H3, and inductance L1, L2, L3, wherein, three-phase half-bridge by Q1,
Six IGBT compositions of Q2, Q3, Q4, Q5 and Q6.Output voltage is filtered through electric capacity C2 and exported, and the output voltage is put through resistance R2
Electricity., respectively by current Hall CT1, CT2 and CT3, output current Iout is adopted through current Hall CT4 for inductance L1, L2 and L3
Sample is controlled.
The control loop of solar battery array simulator has two kinds of structures, and one kind is to include that output voltage is outer, export electricity
Stream outer shroud and the control of inductive current inner ring, another kind is to include output voltage outer ring, output current inner ring and inductive current inner ring
Control.
The control loop block diagram of the present embodiment solar battery array simulator, as shown in Fig. 2 control loop includes output
The control of outer voltage, output current outer shroud and inductive current inner ring, wherein output voltage outer ring are positioned in Millisecond interruption, defeated
Go out electric current outer shroud to be positioned in PWM1 interruptions, inductive current inner ring is positioned in PWM1, PWM2 and PWM3 interruption.
The software control flow chart of the present embodiment solar battery array simulator, as shown in figure 3, after the completion of initialization,
Power network outer shroud control model is PV Schema controls, external voltage is slow open after the completion of, the DSP in solar battery array simulator reads
Take panel and voltage Vout_ref is set used as given voltage, sample current output voltage (i.e. resistance R2 both end voltages) Vout_fb
Used as feedback voltage, DSP is carried out after PI controls as electric current outer shroud according to given voltage Vout_ref and feedback voltage V out_fb
Given value of current I.Power network outer shroud control model is PV Schema controls, then can as needed select " Calc " mode and " tabling look-up "
Mode.Wherein, " Calc " mode is calculated electric current according to solar cell mathematical characteristic sampling current output voltage Vout_fb
I is given, its mathematical characteristic is：Wherein, SrefIt is standard illumination value 1000W/m2, S is actual illumination value；Um and Im are respectively component reality
Nominal rated voltage value and nominal rating current value under the standard conditions of border；Uoc and Isc are respectively the open-circuit voltage of component and short
Road electric current.Because DSP cannot be solved directly to index and logarithm, therefore the present embodiment enters to exponential function and logarithmic function
Digital Realization is gone.Exponential function is e in the present embodimentx(i.e. ax=ex), the Digital Realization that exponential function is solved is specific
For：1. to exponential function exCarry out Taylor series expansion：2. e is utilizedp+q=ep eQ is public
Index x, is expanded into integer part p and fractional part q sums, so that e by formulaxIt is decomposed into epWith eqProduct；3. integer portion
P is divided to expand into 2 each nonnegative integer power sum, so that epThe product for being decomposed into 2 each nonnegative integer power is calculated, its
In 2 each nonnegative integer power system table look-up and draw, eqObtained by 1. shown Taylor series expansion；4. only need to set up one
Index is respectively 1,2,4,8,16,32,64 form, in the case where index is less than 100, integer part p can by 1,2,4,
8th, 16,32,64 directly or superposition show that such as integer part p=16 then can directly draw computing knot in above table
Really, or integer part p=85, because 85 can be drawn by 64,16,4,1 superposition, then only need to be the number corresponding to 64,16,4,1
Value product (i.e. e85=e64·e16·e4·e1) can just draw operation result；5. fractional part q is only needed to by 1. shown expansion
To the 8th grade, you can reach 10 to meet computational accuracy-6.The Digital Realization that logarithmic function is solved is specially：6. to logarithm ln (1
+ y) carry out Taylor series expansion：7. to C2It is public
Logarithm part in formulaCarry out equivalent transformationAnd substitute into formula 6.；8. a formula is only needed to 6. to open up
Open to the 11st grade, it is possible to meet computational accuracy and reach 10-3.On the one hand, in certain interval, the value of integer part p
Possibility be limited, this is caused to epCan table look-up and draw, without directly carrying out exponent arithmetic；On the other hand, eqUsing Thailand
Strangle series computing and be decomposed into sum of products and sue for peace two kinds of computings, without directly carrying out exponent arithmetic；Due to exIt is decomposed into epWith eqIt
Product, the computing of the product is without directly carrying out exponent arithmetic --- without directly carrying out exponent arithmetic, you can finally draw
exValue, so as to without the stronger computer of operational capability, only need to can be obtained by given value of current I to carry using DSP operation
Supply output current outer shroud, so as to realize rapid computations with relatively low equipment cost.
Step in the computational methods be given for the present invention, can set up functional module, be combined into functional module construction,
It is main to be realized by storing computer program in a computer-readable storage medium.
Claims (6)
1. the output voltage outer ring computational methods during solar battery array simulator output power network outer shroud is controlled, according to current defeated
Go out voltage Vout_fb, obtain given value of current I through exponent arithmetic to be supplied to output current outer shroud or output current inner ring, it is special
Levying is, in the exponent arithmetic, to axComputing comprise the following steps：
Index x is expanded into integer part p and fractional part q sums, so that axIt is decomposed into apWith aqProduct calculate, it is right
A thereinpTable look-up drawing, to a thereinqThen drawn with Taylor series computing.
2. the output voltage outer ring during solar battery array simulator output power network outer shroud according to claim 1 is controlled
Computational methods, it is characterized in that, logarithm operation is also included during above-mentioned given value of current I is obtained, in the logarithm operation,
Logarithmic function Taylor series computing is drawn.
3. the output voltage outer ring during solar battery array simulator output power network outer shroud according to claim 1 is controlled
Computational methods, it is characterized in that, to aμTable look-up in the step of drawing, integer part p is expanded into 2 each nonnegative integer power
Sum, so that apThe product for being decomposed into 2 each nonnegative integer power is calculated, wherein, 2 nonnegative integer power system tables look-up
Go out.
4. the output voltage outer ring computing device in the control of solar battery array simulator output power network outer shroud, including basis is worked as
Preceding output voltage Vout_fb, obtains given value of current I to be supplied to output current outer shroud or output current inner ring through exponent arithmetic
A devices, it is characterized in that, its in the exponent arithmetic, including to axThe device of computing is carried out, it is specifically included：Index x exhibitions
It is integer part p and fractional part q sums to open, so that axIt is decomposed into apWith aqProduct come the device that calculates；To a thereinp
Table look-up the device for drawing；To a thereinqThe device drawn with Taylor series computing.
5. the output voltage outer ring during solar battery array simulator output power network outer shroud according to claim 4 is controlled
Computing device, it is characterized in that, A devices also include logarithm operation device, and it draws to logarithmic function Taylor series computing.
6. the output voltage outer ring meter during the solar battery array simulator output power network outer shroud according to right wants 4 is controlled
Device is calculated, it is characterized in that, to a thereinpThe device for drawing that table look-up is specifically included：Integer part p expand into 2 it is each non-
Negative integer power sum, so that apBe decomposed into 2 each nonnegative integer power product come the device that calculates；To therein 2
Nonnegative integer power table look-up the device for drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610993730.5A CN106787789B (en) | 2016-11-10 | 2016-11-10 | Solar battery array simulator exports output voltage outer ring calculation method and device in power grid outer loop control |
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| CN201610993730.5A CN106787789B (en) | 2016-11-10 | 2016-11-10 | Solar battery array simulator exports output voltage outer ring calculation method and device in power grid outer loop control |
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| CN106787789A true CN106787789A (en) | 2017-05-31 |
| CN106787789B CN106787789B (en) | 2019-04-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109240398A (en) * | 2018-09-18 | 2019-01-18 | 深圳市航天新源科技有限公司 | Solar battery array simulator working point control type I-V outer loop control method |
| CN114465494A (en) * | 2021-12-14 | 2022-05-10 | 广东福德电子有限公司 | Direct-current power supply of high-power pulse load and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109240398A (en) * | 2018-09-18 | 2019-01-18 | 深圳市航天新源科技有限公司 | Solar battery array simulator working point control type I-V outer loop control method |
| CN114465494A (en) * | 2021-12-14 | 2022-05-10 | 广东福德电子有限公司 | Direct-current power supply of high-power pulse load and control method |
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| CN106787789B (en) | 2019-04-02 |
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