CN109738684A - The current detection module and electric current detecting method of tower-type solar thermal power generating system - Google Patents
The current detection module and electric current detecting method of tower-type solar thermal power generating system Download PDFInfo
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Abstract
A kind of current detection module of tower-type solar thermal power generating system, comprising: three road current sampling units can carry out real-time sampling to three kinds of similar and different high current signals simultaneously and export low current signal；Converting unit is electrically connected with three road current sampling units, for low current signal to be converted into digital signal；Processing unit is electrically connected with converting unit, determines electric current calculation formula based on circuit information, and carry out that current value is calculated by electric current calculation formula and digital signal, current value is the current value of current detection module detection.Three kinds of similar and different high current signals can be sampled simultaneously by three road current sampling units, effectively reduce the installation number of detection module in power distribution cabinet, current transformer used in three road current sampling units is integrated with temperature-compensation circuit, phase compensating circuit again by the method for software filtering, the measurement accuracy of current detection module is improved, input current is all up in the measurement accuracy of a few peace to several hundred peaces to 0.01 grade.
Description
Technical field
The present invention relates to solar energy thermal-power-generating technical fields, and in particular to the current detecting of tower-type solar thermal power generating system
Module and electric current detecting method.
Background technique
While economy continues to develop, the energy is increasingly short, and traditional non-renewable energy resources are increasingly depleted, economic development
Increasingly be limited by the development and utilization of the energy, the utilization of renewable energy by common concern, especially Solar use more by
The attention of common people.
Solar energy thermal-power-generating is a kind of major way of current Solar use.Current solar energy thermal-power-generating is according to solar energy
Acquisition mode can be divided into (1) tower type solar energy thermal power generation；(2) trough type solar power generation；(3) disc type solar energy heat generates electricity.
In solar energy thermal-power-generating field, tower type solar energy thermal power generation is because having high photothermal conversion efficiency, high focus temperature, control
The advantages such as system installation and debugging processed are simple, and radiation loss is few will become the new energy source technology of next commercially viable operation.
In tower type solar energy thermal power generation field, power supply system is an important composition portion of tower-type solar thermal power generating system
Point.And detect emphasis and difficult point that the supply current between power distribution cabinet and each system is current detecting.Power distribution cabinet is with other
The electrical connecting wires of the current supply circuit of system are sufficiently complex, and current detection module usage amount is big, and space occupancy rate is big.
In tower type solar energy thermal power generation field, variation of ambient temperature is big, and current detection module internal current mutual inductor is secondary
Side output voltage changes greatly, causes detection error larger, is unable to satisfy the requirement of detection accuracy.
In tower type solar energy thermal power generation field, electric current often changes in several peaces between several hundred peaces, common current transformer
In a certain small-range detection accuracy can reach 0.2 grade it is even higher, the precision not being able to satisfy in gamut reaches 0.2 grade.
Summary of the invention
The application provides the current detection module and electric current detecting method of a kind of tower-type solar thermal power generating system, the electric current
Detection module retention performance in the big environment of temperature change is basically unchanged, and the detection accuracy in gamut is all at 0.01 grade.
According in a first aspect, provide a kind of current detection module of tower-type solar thermal power generating system in a kind of embodiment,
Including shell, further includes:
Three road current sampling units, for can real-time sampling to be carried out simultaneously to three kinds of similar and different high current signals simultaneously
Low current signal is exported, the high current signal is the current signal of power distribution cabinet output, and the low current signal is will be described big
Current signal is by the current signal after no-load voltage ratio diminution；
Converting unit is electrically connected with three road current sampling unit, for low current signal to be converted into digital signal；
Processing unit is electrically connected with the converting unit, determines electric current calculation formula based on circuit information, and by described
Electric current calculation formula and digital signal carry out that current value is calculated, and the current value is the electricity of current detection module detection
Flow valuve, the circuit information include that sampling resistor value in the current sampling unit of three road, no-load voltage ratio value, sampled voltage pass through increasing
W unsigned numbers corresponding to the beneficial range value for amplifying N times, current value input processing unit.
In a kind of embodiment, the electric current calculation formula are as follows:
I=(Irms-I0)/2W×Umax/R×B；
Wherein, I is the current value of measured signal；IrmsFor the position the W unsigned number of input processing unit；I0For electric current to be measured
The position the W unsigned number of input processing unit when value is 0A；2W10 system exports codings when for input processing unit being full scale；
UmaxVoltage range value when for sampled voltage by N times of gain amplification, R are sampling resistor value, and B is no-load voltage ratio value.
In a kind of embodiment, three road current sampling unit fixes the current transformer of three different no-load voltage ratios respectively, and
It is independent of each other between adjacent current mutual inductor, so that, it can be simultaneously to three kinds of differences by the current transformer of three different no-load voltage ratios
Or identical high current signal carries out real-time sampling and exports low current signal.
In a kind of embodiment, the current transformer includes toroidal core and coil, and the toroidal core uses ultracrystallite
Permeability magnetic material is made, and the coil uses enameled wire, and the coil precision coiling is evenly distributed on the circumference of the toroidal core
On, and winding method is staggeredly coiling.
In a kind of embodiment, the current transformer is integrated with temperature-compensation circuit and phase compensating circuit, the temperature
Compensation circuit, which is used to reduce the coil heating, leads to the variation for measuring voltage, and the phase compensating circuit is for compensating secondary side
Current and phase difference.
In a kind of embodiment, the converting unit includes:
Filter circuit, for being filtered to low current signal；
Conversion circuit, for being converted into digital signal to filtered current signal；
Current-limiting circuit is set to before the conversion circuit, is used for current-limiting protection, and preventing surveyed electric current is more than maximum
Journey.
In a kind of embodiment, the filter circuit includes:
Low-pass filter carries out low-pass filtering to current signal, to remove high-frequency noise；
High-pass filter, for removing the flip-flop in current signal；
Software filtering acquires the M current value being calculated by electric current calculation formula, calculates being averaged for M current value
Current value, by average current value and M current value one by one compared with, fit closest to actual current value.
In a kind of embodiment, the shell is made of special ABS material so that the current detection module -40 DEG C -
Characteristic will not be lost in 85 DEG C of environment.
In a kind of embodiment, the bottom of the shell is equipped with guide tracked card slot.
According to second aspect, a kind of electric current detecting method of above-mentioned current detection module, packet are provided in a kind of embodiment
Include step:
Real-time sampling is carried out by high current signal of the three road current sampling units to detection and exports low current signal, institute
The current signal that high current signal is power distribution cabinet output is stated, the low current signal is to reduce the high current signal by no-load voltage ratio
Current signal afterwards；
Low current signal is converted into digital signal by converting unit；
Electric current calculation formula is determined based on circuit information through the processing unit, and passes through the electric current calculation formula and number
Signal carries out that current value is calculated, and the current value is the current value of current detection module detection, the circuit information
N times of range amplified by gain including the sampling resistor value in the current sampling unit of three road, no-load voltage ratio value, sampled voltage
W unsigned numbers corresponding to value, current value input processing unit.
It, can be simultaneously to three kinds of differences or phase by three road current sampling units according to the current detection module of above-described embodiment
Same high current signal is sampled, and the installation number of detection module in power distribution cabinet is effectively reduced, in addition, three road current sample lists
Current transformer used in member is integrated with temperature-compensation circuit, phase compensating circuit again by the method for software filtering, improves
The measurement accuracy of current detection module, input current are all up in the measurement accuracy of a few peace to several hundred peaces to 0.01 grade.
Detailed description of the invention
Fig. 1 is current detection module functional block diagram；
Fig. 2 is current detection module detailed schematic block diagram；
Fig. 3 is current transformer structure schematic diagram；
Fig. 4 is software filtering schematic diagram；
Fig. 5 is RS485 communication interface circuit figure；
Fig. 6 is tower-type solar thermal power generating system schematic diagram；
Fig. 7 is current detection module schematic view of the mounting position.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.
In embodiments of the present invention, a kind of current detection module suitable for tower-type solar thermal power generating system is provided, it should
Current detection module has the characteristics that small in size, measurement accuracy is high, which arrives input current in several peaces several hundred
The measurement accuracy of peace is all up to 0.01 grade, and the current detection module is described in detail below.
The inside functional block diagram of current detection module as shown in Figure 1, concrete principle figure as shown in Fig. 2, current detection module
Including shell, three road current sampling units, converting unit and processing unit, wherein three road current sampling units are installed on shell
Outside, for that can carry out real-time sampling to three kinds of similar and different high current signals simultaneously and handle low current signal；Conversion
Unit is placed in enclosure interior, is electrically connected with three road current sampling units, for low current signal to be converted into digital signal；Processing
Unit is placed in enclosure interior, is electrically connected with converting unit, determines electric current calculation formula based on circuit information, and calculate by electric current
Formula and digital signal carry out that current value is calculated, and current value is the current value of current detection module detection.
The shell of the current detection module of this example is made of special ABS material, meets technical grade environment, -40 DEG C of adaptation -
85 DEG C of requirement, so that current detection module will not lose characteristic in -40 DEG C of -85 DEG C of environment.
Wherein, the bottom of shell is equipped with guide tracked card slot, make current detection module can vertical wall installation, improve space
Utilization rate.
In this example, a height of 70mm*70mm*50mm of the length and width of current detection module is suitable for narrow space mounting arrangements.
It should be noted that high current signal is transformed into low current signal by tri- road current sampling unit of this example Zhong,
In, high current signal is the current signal of power distribution cabinet output, and low current signal is after reducing high current signal by no-load voltage ratio
Current signal.
The three road current sampling units of this example fix the current transformer of three different no-load voltage ratios, and adjacent current mutual inductance respectively
It is independent of each other, that is to say between device, per a current transformer is fixed all the way, the outermost layer of current transformer is coated with insulation
Layer, in this way, three road current samples are fixed there are three the current transformer of different no-load voltage ratios, because of insulating layer between adjacent current mutual inductor
It is independent of each other, so that, it can be simultaneously to three kinds of similar and different high current signals by the current transformer of three different no-load voltage ratios
It carries out real-time sampling and low current signal is exported by no-load voltage ratio；When concrete application, conducting wire to be measured passes through fixed current transformer,
Detection electric current is grabbed by current transformer, in addition, current transformer is removably mounted to the top of shell, it can be according to electricity to be measured
Stream selects the current transformer of different ranges.
As shown in figure 3, the current transformer of this example includes toroidal core and coil, wherein toroidal core uses ultracrystallite
Permeability magnetic material is made, and leakage field is small, and coil uses enameled wire, and the primary coil and secondary coil of current transformer use precision instrument
Accurate coiling is evenly distributed on the circumference of toroidal core, and winding method is staggeredly coiling, can be carried out to the electric current of 0A-100A
Sampling, and be able to achieve scaled to high current.
In addition, the current transformer of this example integrates a temperature-compensation circuit, the temperature-compensation circuit is for reducing coil
Fever leads to the variation for measuring voltage, that is to say, so that temperature change is unobvious to detection voltage change.
Further, the current transformer of this example also integrates a phase compensating circuit, and the phase compensating circuit is for compensating
Secondary side current phase difference, that is to say, phase compensating circuit can reduce the phase difference generated by coil winding mode.
In a particular application, it is connected with a conventional, electric-resistance R and a thermistor Rt with positive temperature coefficient,
In, in coil inside, temperature influences caused by being reduced with this because of coil self-heating, then concatenates a product for thermistor Rt setting
Device is divided to be used to compensate the phase difference generated by coil winding mode.
Wherein, the resistance value determination process of conventional, electric-resistance R is as follows:
Under certain electric current, the output voltage of integrator is u0 when temperature t0, the output voltage of integrator when temperature t1
For u1, then
Δ u=u1-u0；
Δ t=t1-t0；
Its rate of temperature change be Δ u/ Δ t according to
In order to compensate for variation, u0=u1 should be made, wherein R0=R+Rt0, R1=R+Rt0 (1+a Δ t)；
In formula: thermistor resistance value when Rt0-t0；
A-thermistor temperature coefficient；
Rt0=R Δ u/ [U1- (1+a Δ t) U0]；
In formula: U0, U1- temperature are t0, t1 degree, current transformer output voltage when no thermistor.
The converting unit of this example includes filter circuit, conversion circuit and limit circuit, wherein filter circuit is used for small electricity
Stream signal carries out filter filter, and conversion circuit is used to be converted into filtered current signal digital signal, and current-limiting circuit, which is set to, to be turned
It changes before circuit, is used for current-limiting protection, prevent from taking a sample test electric current more than maximum range, therefore, even if surveyed electric current is more than maximum
Journey will not have an impact the other parts of current detection module.
Further, filter circuit includes low-pass filter, high-pass filter and software filter, wherein low-pass filter
Low-pass filtering is carried out to current signal, to remove high-frequency noise, high-pass filter is used to remove the flip-flop in current signal,
Software filtering uses the M current value being calculated by electric current calculation formula, calculates the average current value of M current value, will
Average current value and M current value one by one compared with, fit closest to actual current value.
Wherein, software filtering implementation it is assumed that M be 64, then acquire 64 times by calculation formula calculating
Obtained current value calculates the average current value of 64 current values, by the average current value and 64 current values one by one compared with, intend
It closes out closest to actual current value, the current value that this is fitted is sent to processing unit.
It, can be according to answering in addition, the current detection module of this example also has AC/DC calibration function in order to improve sampling precision
Different calibration procedures are selected to calibrate the current value fitted with occasion difference and permissible accuracy difference, the electricity after calibration
Flow valuve is sent to processing unit.
Processing unit determines electric current calculation formula based on circuit information, and passes through electric current calculation formula and the electric current fitted
The corresponding digital signal of value carries out that current value is calculated, which is the electricity for the detection that current detection module is finally presented
Flow valuve, wherein circuit information includes that sampling resistor resistance value in three road current sampling units, no-load voltage ratio value, sampled voltage pass through increasing
24 unsigned numbers corresponding to the beneficial range value for amplifying N times, current value input processing unit.
Wherein, electric current calculation formula are as follows:
I=(Irms-I0)/2W×Umax/R×B；
Wherein, I is the current value of measured signal；IrmsFor the position the W unsigned number of input processing unit；I0For electric current to be measured
The position the W unsigned number of input processing unit when value is 0A；2W10 system exports codings when for input processing unit being full scale；
UmaxVoltage range value when for sampled voltage by N times of gain amplification, R are sampling resistor value, and B is no-load voltage ratio value.
The calculation formula of sampling resistor value are as follows:
U in above formula2For the input voltage of conversion, it is up to 250mV, when input is exchanges, the alternating current of input is pressed with
Valid value is up toN2For the primary turns of current transformer, I1For maximum current；
The process of current detection module concrete application is: detection electric current reduces electric current, sampled electricity by current transformer
Resistance switchs to sampled voltage, detection electric current is obtained after a series of conversions, detailed process is as follows:
Sampled voltage is generally millivolt level, can by programmable-gain amplifier, amplification factor if sampled voltage is too small
10 times or 50 times are selected, input voltage full scale ± 250mv or ± 50mv are made；
High-speed figure low-pass filtering in converting unit carries out low-pass filtering to data, to remove the high frequency of modulator output
Noise, the Digital High Pass Filter in converting unit are filtered signal, to remove electric current letter before current effective value calculates
Flip-flop in number；
After filtering, the digital quantity of transient voltage and electric current will be calibrated based on DC/AC offset, gain register, be passed through
After crossing offset and gain adjustment, W transient data sampled value deposit transient voltages and electric current register, virtual value is using recently
N number of transient state sampled value calculate, can be read from RMS current register, output W unsigned numbers；
That is to say, W unsigned numbers are determined according to the part characteristic of processing unit, when in processing unit have 24
When the transient data of position, then W is 24, correspondingly, then W is 12 when processing unit has 12 transient datas, is with processing unit
For 24 transient datas, then 24 unsigned number input processing units, through the processing unit in burning electric current calculation formula
Calculate the current value of signal to be detected.
I=(Irms-207428)/224×250/4.7×1850；
Wherein I is the current value of measured signal；IrmsFor 24 unsigned numbers of input processing chip；207428 be to be measured
24 unsigned numbers of input processing chip when current value is 0A；224When for input processing chip being full scale 250mV 10 into
Exports coding processed；250 be voltage range when sampled voltage gain selects 10 times, and 4.7 be the resistance value of sampling resistor, and 1850 be change
Than.
Such as electric current to be measured is 69.7A, the current transformer for being 1850 by no-load voltage ratio by the current value that multimeter is read
It is reduced into 69.7A/1850=37.7mA, is converted into sampled voltage 37.7*4.7=177.1mV by sampling resistor (4.7 Ω),
24 unsigned numbers 12079846 are converted by the D/A converting circuit of converting unit, it can by this value substitution electric current calculation formula
Obtaining current value is 69.6A.
Further, the current detection module of this example further includes output unit, output unit be integrated with RS485, RS232,
The various communication interfaces such as USB, RJ45, the output for different occasions to current data, it is preferred that output unit is logical for RS485
When communication interface, circuit diagram reads real-time current value as shown in figure 5, host computer is issued by Solarnumen Comdebug to processing unit
Instruction, such as the current value in 3 channels is read, 01 03 00 10 00 03 F7 2C of transmitting order to lower levels, slave computer echo back data
For 01 03 06 27 10 27 10 27 10 FD E8, the communications protocol comparison with current detection module knows that three channels are read
The current value arrived is 10A, 10A, 10A.
Further, the current detection module of this example further includes alarm unit, is more than that current detection module is maximum when detecting
It is alarmed when the electric current of range by alarm unit, such as sound-light alarm.
It is illustrated so that current detection module is in tower-type solar thermal power generating system as an example below.
As shown in fig. 6, tower-type solar thermal power generating system makes sunlight exist by driving a large amount of heliostats to track sunlight
Heat dump surface aggregation positioned at heat absorption tower top end heats heat absorption working medium, luminous energy is made to be converted to thermal energy, and then by thermal energy
It is converted into electric energy, realizes solar energy thermal-power-generating.
As shown in fig. 7, the power supply power supply of driving heliostat rotation is exported by power distribution cabinet, current detection module is arranged in distribution
On cabinet to the cable between SSR control cabinet or after SSR control cabinet, on the cable before being spaced apart, cable passes through checking of great current
It is fixed after module by the guide rail on wall, the confession between current detection module realization power distribution cabinet and each system is passed through with this
The current detecting of electric current.
Based on above-mentioned current detection module, this example also provides the current detecting side that above-mentioned current detection module is realized
Method, comprising steps of
Step 1: real-time sampling being carried out by high current signal of the three road current sampling units to detection and exports low current
Signal, high current signal are the current signal of power distribution cabinet output, and low current signal is to reduce the high current signal by no-load voltage ratio
Current signal afterwards；Specific structure about three road current sampling units please refers to the description of above-mentioned three road current sampling unit,
It does not repeat herein.
Step 2: low current signal is converted by digital signal by converting unit；About converting unit concrete principle and
Realization process please refers to the specific descriptions of above-mentioned converting unit, does not repeat herein.
Step 3: electric current calculation formula being determined based on circuit information through the processing unit, and passes through the electric current calculation formula
And digital signal carries out that current value is calculated, current value is the current value of current detection module detection, and circuit information includes three
Sampling resistor value, no-load voltage ratio value, sampled voltage in the current sampling unit of road amplified by gain N times range value, current value it is defeated
Enter W corresponding to processing unit unsigned number.About the determination and specific calculating process of electric current calculation formula, please refer to
The implementation procedure of above-mentioned processing unit, does not repeat herein.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (10)
1. a kind of current detection module of tower-type solar thermal power generating system characterized by comprising
Three road current sampling units, for that can carry out real-time sampling to three kinds of similar and different high current signals simultaneously and export
Low current signal, the high current signal are the current signal of power distribution cabinet output, and the low current signal is by the high current
Signal is by the current signal after no-load voltage ratio diminution；
Converting unit is electrically connected with three road current sampling unit, for low current signal to be converted into digital signal；
Processing unit is electrically connected with the converting unit, determines electric current calculation formula based on circuit information, and pass through the electric current
Calculation formula and digital signal carry out that current value is calculated, and the current value is the electricity that the current detection module finally detects
Flow valuve, the circuit information include that sampling resistor value in the current sampling unit of three road, no-load voltage ratio value, sampled voltage pass through increasing
W unsigned numbers corresponding to the beneficial range value for amplifying N times, current value input processing unit.
2. current detection module as described in claim 1, which is characterized in that the electric current calculation formula are as follows:
I=(Irms-I0)/2W×Umax/R×B；
Wherein, I is the current value of measured signal；IrmsFor the position the W unsigned number of input processing unit；I0It is 0A for current value to be measured
When input processing unit the position W unsigned number；2W10 system exports codings when for input processing unit being full scale；UmaxFor
Voltage range value when sampled voltage is by N times of gain amplification, R are sampling resistor value, and B is no-load voltage ratio value.
3. current detection module as described in claim 1, which is characterized in that three road current sampling unit fixes three respectively
The current transformer of a difference no-load voltage ratio, and be independent of each other between adjacent current mutual inductor, so that, pass through the electricity of three different no-load voltage ratios
Current transformer can carry out real-time sampling to three kinds of similar and different high current signals simultaneously and export low current signal.
4. current detection module as claimed in claim 3, which is characterized in that the current transformer includes toroidal core and line
Circle, the toroidal core are made of ultracrystallite permeability magnetic material, and the coil uses enameled wire, and the coil precision coiling is uniform
It is distributed on the circumference of the toroidal core, and winding method is staggeredly coiling.
5. current detection module as claimed in claim 3, which is characterized in that the current transformer is integrated with temperature-compensating electricity
Road and phase compensating circuit, the temperature-compensation circuit, which is used to reduce the coil heating, leads to the variation for measuring voltage, described
Phase compensating circuit is for compensating secondary side current phase difference.
6. current detection module as described in claim 1, which is characterized in that the converting unit includes:
Filter circuit, for being filtered to low current signal；
Conversion circuit, for being converted into digital signal to filtered current signal；
Current-limiting circuit is set to before the conversion circuit, is used for current-limiting protection, and preventing surveyed electric current is more than maximum range.
7. current detection module as claimed in claim 6, which is characterized in that the filter circuit includes:
Low-pass filter carries out low-pass filtering to current signal, to remove high-frequency noise；
High-pass filter, for removing the flip-flop in current signal；
Software filtering acquires the M current value being calculated by electric current calculation formula, calculates the average current of M current value
Value, by average current value and M current value one by one compared with, fit closest actual current value.
8. current detection module as described in claim 1, which is characterized in that it further include shell, the three roads current sample list
Member is installed on the hull outside, and the converting unit and processing unit are respectively placed in the enclosure interior, and the shell uses
Special ABS material production, so that the current detection module will not lose characteristic in -40 DEG C of -85 DEG C of environment.
9. current detection module as claimed in claim 8, which is characterized in that the bottom of the shell is equipped with guide tracked card
Slot.
10. such as the electric current detecting method of the described in any item current detection modules of claim 1-9, which is characterized in that including step
It is rapid:
Real-time sampling is carried out by high current signal of the three road current sampling units to detection and exports low current signal, it is described big
Current signal is the current signal of power distribution cabinet output, and the low current signal is after reducing the high current signal by no-load voltage ratio
Current signal；
Low current signal is converted into digital signal by converting unit；
Electric current calculation formula is determined based on circuit information through the processing unit, and passes through the electric current calculation formula and digital signal
It carries out that current value is calculated, the current value is the current value of current detection module detection, and the circuit information includes
Sampling resistor value, no-load voltage ratio value, sampled voltage in the current sampling unit of three road amplify N times of range value, electricity by gain
W corresponding to flow valuve input processing unit unsigned number.
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| CN110940685A (en) * | 2019-11-22 | 2020-03-31 | 南昌航空大学 | Organic electroluminescent material, organic electroluminescent device and control method |
| CN111949051A (en) * | 2020-07-27 | 2020-11-17 | 江西久盛国际电力工程有限公司 | Automatic sun tracking control system and method for trough type heliostat field |
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Application publication date: 20190510 |