CN109302145A - A kind of photovoltaic array I-V characteristic detection device and detection method - Google Patents
A kind of photovoltaic array I-V characteristic detection device and detection method Download PDFInfo
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Abstract
The present invention relates to a kind of photovoltaic array I-V characteristic detection device and its detection methods, setting charging measurement circuit is that two unequal capacitors of capacitance are connected in parallel, it is respectively formed respective charging measurement branch, control circuit is used for the on-off by least one charging measurement branch of control, change the capacitance of the charging measurement circuit of access photovoltaic array, and acquisition obtains the charging current and its both end voltage of charging measurement circuit under different capacitances, it is calculated according to the charging current for the charging measurement circuit for acquiring acquisition under different capacitances and both end voltage and obtains line inductance and line resistance, the I-V characteristic for obtaining photovoltaic array is calculated using line inductance and line resistance, the present invention can effectively improve the precision of photovoltaic array I-V characteristic detection, its is easy to operate, safety, it is small in size, it is light-weight.
Description
Technical field
The present invention relates to a kind of detection device and its detection method, specifically a kind of photovoltaic array I-V characteristic inspection
Survey device and its detection method.
Background technique
Photovoltaic array is the core component of photovoltaic plant, even also needing in tens years after putting into operation
The I-V characteristic of photovoltaic array is detected, accurately to obtain photovoltaic system generated energy, maintenance easy to repair.Photovoltaic array
Detection device be it is a kind of photovoltaic array is detected at the scene, to obtain the device of the accurate I-V characteristic curve of photovoltaic array.
Photovoltaic array I-V characteristic detection method in the prior art is the method to bulky capacitor charging, in photovoltaic array
Both ends shunt capacitance, it is by power resistor that the electric quantity consumption of capacitor remnants is complete first when testing beginning, so that capacitor is kept
Zero original state, impedance are very low almost nil, it is believed that the electric current of sampling apparatus acquisition at this time is short circuit current, when capacitor charging knot
Shu Hou, impedance is very big, and charge circuit is equivalent to open circuit, it is believed that the voltage of sampling apparatus acquisition at this time is open-circuit voltage.In electricity
In the charging process of appearance, that is, the impedance of resistance is thought from zero to infinity, the load for being equivalent to photovoltaic array increases from zero to nothing
It is poor big, by recording the situation of change of this process voltage and electric current, the I-V characteristic curve of photovoltaic array is obtained, and showing
It is shown on screen.
But there are line inductance and line resistance when due to the detection of photovoltaic array I-V characteristic, line inductance and resistance meeting
It is divided when capacitor charging detection, existing photovoltaic array I-V characteristic detection method only has detected on capacitor
I-V characteristic curve but has ignored the influence of line inductance and resistance, and causing last measurement result is not accurate photovoltaic battle array
Column I-V characteristic.Simultaneously as the presence of line inductance, electric current can not be mutated in zero moment, so electric at the beginning
Holding voltage is zero, and electric current is also zero, will have biggish error for the measurement of short circuit current, eventually leads to I-V characteristic song
There are biggish errors for line.This method will improve the precision of measurement, it is necessary to increase capacitance, therefore increase volume and weight.
Summary of the invention
The present invention be to avoid above-mentioned the deficiencies in the prior art, provide it is a kind of it is small in size, light weight and cost is low and precision is high
Photovoltaic array I-V detection device and its detection method.
The present invention adopts the following technical scheme that in order to solve the technical problem
Photovoltaic array I-V characteristic detection device of the present invention includes control circuit, charging measurement circuit and display circuit, spy
Point is: the charging measurement circuit is that two unequal capacitors of capacitance are connected in parallel, and two capacitors are respectively formed respectively
From charging measurement branch, i.e. the first charging measurement branch and i.e. the second charging measurement branch, the control circuit is for passing through
The on-off of at least one charging measurement branch is controlled, changes the capacitance of the charging measurement circuit of access photovoltaic array, and not
The charging current and its both end voltage that charging measurement circuit is obtained with acquisition under capacitance, obtain according to acquiring under different capacitances
Charging measurement circuit charging current and both end voltage calculate obtain line inductance L and line resistance R, utilize the line electricity
Feel L and line resistance R and calculates the I-V characteristic for obtaining photovoltaic array.
The characteristics of photovoltaic array I-V characteristic detection device of the present invention lies also in: the control circuit includes that Current Voltage is adopted
Sample circuit and DSP signal processing circuit for carrying out data processing, the current-voltage sampling circuit include and the charging
The current sampling switch S of test circuit in parallel connection and the power resistor being connected in parallel with capacitor, the current-voltage sampling
Circuit under different capacitances acquisition obtain the charging current and both end voltage of the charging measurement circuit, respectively as adopting
Sample electric current and sampled voltage.
The characteristics of photovoltaic array I-V characteristic detection device of the present invention, lies also in: the circuit structure of the charging measurement branch
Are as follows: using one end of capacitor on-off switch as the terminal A of charging measurement branch, using the forward end of diode as charging measurement branch
Terminal B, capacitor is arranged in series between capacitor on-off switch and the negative pole end of diode；One end of the power resistor
The terminal A of charging measurement branch is connected to by power resistor on-off switch, the other end of power resistor is connected to diode
Negative pole end forms the parallel-connection structure of power resistor and capacitor；The charging measurement branch is connected with its terminal A and terminal B parallel connection
It connects at the both ends of charging measurement circuit.
The characteristics of photovoltaic array I-V characteristic test method of the present invention is: the application photovoltaic array I-V characteristic tests dress
It sets, is tested as follows:
Step 1, in 0~t1Stage, closed path sampling switch S disconnect the capacitor on-off in each charging measurement branch
Switch and power resistor on-off switch, the capacitor in each charging measurement branch are maintained at zero original state, charging measurement circuit
It is short-circuited, due to the effect of line inductance L, sample rate current is gradually increased by 0, and in t1Moment reaches maximum value, records t1Moment
Sample rate current I0, the sample rate current I0For photovoltaic array short circuit current；
Step 2, in t1~t2Stage, turn-off current sampling switch S, the capacitor connected in the first charging measurement branch are logical
It disconnects and closing, capacitor of the photovoltaic array into the first charging measurement branch charges, in t2Moment the first charging measurement branch
The charging current of middle capacitor is reduced to zero, and charging process terminates, and records t2The sampled voltage V at moment1And this stage current
Voltage response P1, the sampled voltage V1For the open-circuit voltage of the first charging measurement branch；
Step 3, in t2~t3Stage disconnects the capacitor on-off switch in the first charging measurement branch, connects the second charging
The capacitor on-off switch in branch is tested, capacitor of the photovoltaic array into the second charging measurement branch charges, in t3
The charging current of capacitor is reduced to zero in moment the second charging measurement branch, and charging process terminates, and records t3The sampling at moment
Voltage V2And this stage current voltage response P2, the sampled voltage V2For the open circuit electricity of the second charging measurement branch
Pressure；
Step 4, in t3~t4Stage is closed capacitor on-off switch in the first charging measurement branch, and is closed first and fills
Power resistor on-off switch in electrical testing branch and the second charging measurement branch, using power resistor in t4Moment completes to first
The electric discharge of capacitor in charging measurement branch and the second charging measurement branch；
Step 5, in t4~t5Stage disconnects the power resistor on-off in the first charging measurement branch and the second test branch
Switch, capacitor of the photovoltaic array simultaneously into the first charging measurement branch and the second charging measurement branch charges, in t5
The charging of capacitor is zero in moment the first charging measurement branch and the second charging measurement branch, and charging process terminates, record
t5The sampled voltage V at moment3And this stage current voltage response P3, the sampled voltage V3For charging measurement circuit
Open-circuit voltage；
Step 6, the same sampled current value I of settingk,
The corresponding electric current I is obtained in current-voltage characteristic curve P1kSampled voltage U1；
The corresponding electric current I is obtained in current-voltage characteristic curve P2kSampled voltage U2；
The corresponding electric current I is obtained in current-voltage characteristic curve P3kSampled voltage U3；
Set another sampled current value Ik+1
Determine the I in current-voltage characteristic curve P1k+1With IkBetween time interval be Δ t1；
Determine the I in current-voltage characteristic curve P2k+1With IkBetween time interval be Δ t2；
Determine the I in current-voltage characteristic curve P3k+1With IkBetween time interval be Δ t3；
It is calculated by formula (1) and obtains the sampled current value I in current-voltage characteristic curve P1, P2 and P3kDifferential value d1, d2
And d3:
It is calculated using equation group (2) and obtains line inductance L and line resistance R:
Wherein U characterizes photovoltaic array end voltage；
Step 7, according to the line inductance L and line resistance R, optimize by error obtain photovoltaic array eliminate due to
Photovoltaic array voltage value to be measured and current value after the error that line inductance L and line resistance R is generated；
Step 8, detection terminate, and the power resistor on-off being closed in the first charging measurement branch and the second test branch is opened
It closes, the remaining capacity of each capacitor is all run out of, each capacitor is made to return to zero original state, is then turned off each power resistor
On-off switch.
The characteristics of photovoltaic array I-V characteristic test method of the present invention, lies also in: error optimization be as follows into
Row:
Step 5.1 repeats step 1 to step 6, obtains the n group data about line inductance L and line resistance R, utilizes formula
(3) it calculates and obtains target function value Yi:
Yi=Li+RiIki (3),
In formula (3), IKiIt is I in i-th group of dataKValue, Li is the line electricity inductance value in i-th group of data, and Ri is i-th group of number
The value of line resistance in, i=1,2,3...n；
Step 5.2 defines least square method fitting function such as formula (4):
Yi=L+RIki(4),
By IkiWith calculate the target function value Yi obtained according to fitting function shown in formula (4), using least square method into
Row curve matching obtains least square method fit curve equation group (5):
Step 5.3 enables to the smallest line inductance L of error and line electricity using the equation group (5) calculating acquisition
The value of R is hindered, error optimization is completed.
Compared with the prior art, the invention has the advantages that:
1, the present invention can efficiently reduce the volume and again of detection device by the way of two capacitor charged in parallels
Amount, and detection speed can be improved.
2, the present invention takes voltage sample point at charging measurement circuit both ends, eliminates the detection of line inductance open-circuit voltage
Error, improve the detection accuracy of open-circuit voltage.
3, the present invention has fully considered the influence that line inductance and resistance detect photovoltaic array I-V characteristic, and three groups are not
After same capacitor carries out I-V characteristic detection, the value of line inductance and resistance is solved, photovoltaic array I- can be greatly improved
The precision of V Characteristics Detection restores true photovoltaic array I-V characteristic curve.
4, invention increases short circuit current sampling switch structure, fully considered that electric current is not since line inductance exists
The case where capable of mutating, can greatly improve the precision of short circuit current detection.
Detailed description of the invention
Fig. 1 is photovoltaic array I-V characteristic test device electrical block diagram of the present invention；
Fig. 2 is short circuit currents instrumentation plan of the present invention；
Capacitor voltage at both ends and current diagram when Fig. 3 is charging measurement of the present invention；
Fig. 4 is photovoltaic array I-V characteristic test method schematic diagram in the present invention；
Fig. 5 is the I-V characteristic curve synoptic diagram with line inductance error；
Fig. 6 is the photovoltaic array I-V detection curve schematic diagram obtained using test device shown in Fig. 1；
Fig. 7 is another embodiment electrical block diagram of test device in the present invention.
Specific embodiment
Referring to Fig. 1, photovoltaic array I-V characteristic detection device includes control circuit 2, charging measurement circuit 1 in the present embodiment
With display circuit.Charging measurement circuit 1 is that two capacitances unequal capacitor C1, C2 are connected in parallel, using two capacitors
Device, which is connected in parallel, can effectively reduce device volume and weight, and two capacitors are respectively formed respective charging measurement branch, i.e.,
First charging measurement branch and i.e. the second charging measurement branch, control circuit 2 are used for through at least one charging measurement branch of control
The on-off on road, changes the capacitance of the charging measurement circuit of access photovoltaic array, and acquires and charged under different capacitances
The charging current and its both end voltage for testing circuit, according to the charging for the charging measurement circuit for acquiring acquisition under different capacitances electricity
Stream and both end voltage, which calculate, obtains line inductance L and line resistance R, is calculated using line inductance L and line resistance R and obtains photovoltaic
The I-V characteristic of array, while eliminating as line resistance R and line inductance L to caused by photovoltaic array I-V characteristic to be measured measurement
Error.
As shown in Figure 1, control circuit 2 is including current-voltage sampling circuit and for carrying out data processing in the present embodiment
DSP signal processing circuit, current-voltage sampling circuit include the current sampling switch S being connect with charging measurement circuit in parallel and
The power resistor R being connected in parallel with capacitorP1、RP2, current-voltage sampling circuit filled for acquiring under different capacitances
The charging current and both end voltage of electrical test circuit, respectively as sample rate current and sampled voltage.
As shown in Figure 1, in the present embodiment, the circuit structure of charging measurement branch are as follows: with one end of capacitor on-off switch
For the terminal A of charging measurement branch, using the forward end of diode as the terminal B of charging measurement branch, capacitor is arranged in series in
Between capacitor on-off switch and the negative pole end of diode；One end of power resistor is connected to by power resistor on-off switch to be filled
The terminal A of electrical testing branch, the other end of power resistor are connected to the negative pole end of diode, form power resistor and capacitor
Parallel-connection structure；Charging measurement branch is connected in the both ends of charging measurement circuit 1 in parallel with its terminal A and terminal B.
Photovoltaic array I-V characteristic test method is using photovoltaic array I-V characteristic test device, by as follows in the present embodiment
Step is tested:
Step 1, as shown in Fig. 2, in 0~t1Stage, closed path sampling switch S are disconnected in each charging measurement branch
Capacitor on-off switch and power resistor on-off switch, the capacitor in each charging measurement branch are maintained at zero original state, fill
Electrical test circuit is short-circuited, and due to the effect of line inductance L, electric current cannot be mutated, and sample rate current is gradually increased by 0, and in t1
Moment reaches maximum value, records t1The sample rate current I at moment0, sample rate current I0For photovoltaic array short circuit current.
Step 2, as shown in figure 3, in t1~t2Stage, turn-off current sampling switch S are connected in the first charging measurement branch
Capacitor on-off switch S11, capacitor of the photovoltaic array into the first charging measurement branch charge, capacitor on-off switch
S11Just when closure, the charging current for flowing through capacitor C1 is the short circuit current I of photovoltaic array 10, as photovoltaic array starts to fill
Electricity, charging current slowly reduce, and the load for being equivalent to photovoltaic array slowly reduces, finally in t2Moment the first charging measurement branch
The charging current of middle capacitor is reduced to zero, and charging process terminates, and records t2The sampled voltage V at moment1And this stage current
Voltage response P1, sampled voltage V1For the open-circuit voltage of the first charging measurement branch.As shown in figure 3, being opened in capacitor on-off
When Guan Gang is closed, zero original state of capacitor holding at this time, voltage 0, then under the charging of photovoltaic array, the first charging measurement
Circuit both end voltage gradually rises, due to the effect of line inductance L, during charging current decline, meeting on line inductance L
The voltage of a negative sense is generated, this causes the voltage at the first test charge circuit both ends to generate one and is higher than the open circuit of photovoltaic array 1
The peak value of voltage, as charging current is reduced to 0, the first test charge circuit both end voltage gradually decreases down open-circuit voltage V1。
Step 3, in t2~t3Stage disconnects the capacitor on-off switch S in the first charging measurement branch11, connect second
Capacitor on-off switch S in charging measurement branch21, capacitor of the photovoltaic array into the second charging measurement branch filled
Electricity, in t3The charging current of capacitor is reduced to zero in moment the second charging measurement branch, and charging process terminates, and records t3Moment
Sampled voltage V2And this stage current voltage response P2, sampled voltage V2For the open circuit electricity of the second charging measurement branch
Pressure.
Step 4, in t3~t4Stage is closed capacitor on-off switch S in the first charging measurement branch11, and it is closed the
Power resistor on-off switch S in one charging measurement branch and the second charging measurement branch12、S22, utilize power resistor RP1、RP2?
t4Moment completes the electric discharge to capacitor in the first charging measurement branch and the second charging measurement branch.
Step 5, in t4~t5Stage disconnects the power resistor on-off in the first charging measurement branch and the second test branch
Switch S12、S22, photovoltaic array simultaneously capacitor C1, C2 into the first charging measurement branch and the second charging measurement branch into
Row charging, in t5The charging current of capacitor is zero in moment the first charging measurement branch and the second charging measurement branch, is filled
Electric process terminates, and records t5The sampled voltage V at moment3And this stage current voltage response P3, sampled voltage V3To fill
The open-circuit voltage of electrical test circuit.
Step 6, as shown in figure 4, setting same sampled current value Ik,
Corresponding current I is obtained in current-voltage characteristic curve P1kSampled voltage U1；
Corresponding current I is obtained in current-voltage characteristic curve P2kSampled voltage U2；
Corresponding current I is obtained in current-voltage characteristic curve P3kSampled voltage U3；
Set another sampled current value Ik+1
Determine the I in current-voltage characteristic curve P1k+1With IkBetween time interval be Δ t1
Determine the I in current-voltage characteristic curve P2k+1With IkBetween time interval be Δ t2
Determine the I in current-voltage characteristic curve P3k+1With IkBetween time interval be Δ t3
It is calculated by formula (1) and obtains the sampled current value I in current-voltage characteristic curve P1, P2 and P3kDifferential value d1, d2
And d3:
It is calculated using equation group (2) and obtains line inductance L and line resistance R:
Wherein U characterizes photovoltaic array end voltage.
Step 7, according to line inductance L and line resistance R, optimize by error and obtain photovoltaic array and eliminating due to route
Photovoltaic array voltage value to be measured and current value after the error that inductance L and line resistance R is generated；
Step 8, detection terminate, the power resistor on-off switch being closed in the first charging measurement branch and the second test branch
S12、S22, the remaining capacity of each capacitor is all run out of, each capacitor is made to return to zero original state, is then turned off each power
Resistance on-off switch.
In specific implementation, error optimization is to carry out as follows:
Step 1.1 repeats step 1 to step 6, obtains the n group data about line inductance L and line resistance R, utilizes formula
(3) it calculates and obtains target function value Yi:
Yi=Li+RiIki (3)
In formula (3), IKiIt is I in i-th group of dataKValue, Li is the line electricity inductance value in i-th group of data, and Ri is i-th group of number
The value of line resistance in, i=1,2,3...n.
Step 1.2 defines least square method fitting function such as formula (4):
Yi=L+RIki (4)
By IkiWith calculate the target function value Yi obtained according to fitting function shown in formula (4), using least square method into
Row curve matching obtains least square method fit curve equation group (5):
Step 1.3 enables to error the smallest line inductance L's and line resistance R using equation group (5) calculating acquisition
Value completes error optimization.
As shown in figure 5, being the photovoltaic array I-V characteristic to be measured for not considering the error-detecting of line inductance L and resistance R and going out
Curve, due to the effect of line inductance L, electric current cannot be mutated, and when voltage is 0, electric current is gradually increased to maximum from 0
Value, causes when measuring at the beginning, and the electric current of detection device measurement is not short circuit current, in the mistake of charging current decline
The voltage that a negative sense can be generated on Cheng Zhong, line inductance L and line resistance R, leads to the measured value of photovoltaic array both end voltage
Greater than the true value of photovoltaic array both end voltage, in contrast to as shown in fig. 6, using photovoltaic array I-V detection device of the invention
The accurate photovoltaic array I-V curve detected, it can be seen that line inductance and line resistance will cause very big error,
After photovoltaic array I-V detection device measurement of the invention, hence it is evident that eliminate caused by line inductance and line resistance accidentally
The precision of difference, detection greatly increases.
As shown in fig. 7, in charging measurement circuit, due to using two capacitor parallel connections to carry out third time charging detection
Before, capacitor will carry out second of electric discharge, will increase the time of detection, can third capacitor in parallel in order to shorten detection cycle
Device carries out third time measurement, to reduce second of the time discharged of capacitor, so as to shorten detection cycle.
Claims (5)
1. a kind of photovoltaic array I-V characteristic detection device, including control circuit, charging measurement circuit and display circuit, feature
Be: the charging measurement circuit is that two unequal capacitors of capacitance are connected in parallel, and two capacitors are respectively formed respectively
Charging measurement branch, i.e. the first charging measurement branch and i.e. the second charging measurement branch, the control circuit is for passing through control
The on-off of at least one charging measurement branch is made, changes the capacitance of the charging measurement circuit of access photovoltaic array, and in difference
Acquisition obtains the charging current and its both end voltage of charging measurement circuit under capacitance, is obtained according to acquisition under different capacitances
The charging current and both end voltage of charging measurement circuit, which calculate, obtains line inductance L and line resistance R, utilizes the line inductance
L and line resistance R calculates the I-V characteristic for obtaining photovoltaic array.
2. photovoltaic array I-V characteristic detection device according to claim 1, it is characterized in that: the control circuit includes electricity
Flow voltage sampling circuit and the DSP signal processing circuit for carrying out data processing, the current-voltage sampling circuit include with
The current sampling switch S of the charging measurement circuit in parallel connection and the power resistor being connected in parallel with capacitor, the electric current
Charging current and both end voltage of the voltage sampling circuit for the acquisition acquisition charging measurement circuit under different capacitances, point
It Zuo Wei not sample rate current and sampled voltage.
3. photovoltaic array I-V characteristic detection device according to claim 2, it is characterized in that: the charging measurement branch
Circuit structure are as follows: be charging with the forward end of diode using one end of capacitor on-off switch as the terminal A of charging measurement branch
The terminal B of branch is tested, capacitor is arranged in series between capacitor on-off switch and the negative pole end of diode；The power electricity
One end of resistance is connected to the terminal A of charging measurement branch by power resistor on-off switch, and the other end of power resistor is connected to
The negative pole end of diode forms the parallel-connection structure of power resistor and capacitor；The charging measurement branch is with its terminal A and endpoint
B is connected in the both ends of charging measurement circuit in parallel.
4. a kind of photovoltaic array I-V characteristic test method, it is characterized in that: using photovoltaic array I-V characteristic as claimed in claim 3
Test device is tested as follows:
Step 1, in 0~t1Stage, closed path sampling switch S, disconnect capacitor on-off switch in each charging measurement branch and
Power resistor on-off switch, the capacitor in each charging measurement branch are maintained at zero original state, and charging measurement circuit is short-circuited,
Due to the effect of line inductance L, sample rate current is gradually increased by 0, and in t1Moment reaches maximum value, records t1The sampling electricity at moment
Flow I0, the sample rate current I0For photovoltaic array short circuit current；
Step 2, in t1~t2Stage, turn-off current sampling switch S, the capacitor on-off connected in the first charging measurement branch are opened
It closes, capacitor of the photovoltaic array into the first charging measurement branch charges, in t2It is electric in moment the first charging measurement branch
The charging current of container is reduced to zero, and charging process terminates, and records t2The sampled voltage V at moment1And this stage current voltage
Characteristic curve P1, the sampled voltage V1For the open-circuit voltage of the first charging measurement branch；
Step 3, in t2~t3Stage disconnects the capacitor on-off switch in the first charging measurement branch, connects the second charging measurement
Capacitor on-off switch in branch, capacitor of the photovoltaic array into the second charging measurement branch charges, in t3Moment
The charging current of capacitor is reduced to zero in second charging measurement branch, and charging process terminates, and records t3The sampled voltage at moment
V2And this stage current voltage response P2, the sampled voltage V2For the open-circuit voltage of the second charging measurement branch；
Step 4, in t3~t4Stage is closed capacitor on-off switch in the first charging measurement branch, and is closed the first charging and surveys
Power resistor on-off switch in branch and the second charging measurement branch is tried, using power resistor in t4Moment completes to charge to first
Test the electric discharge of capacitor in branch and the second charging measurement branch；
Step 5, in t4~t5Stage disconnects the power resistor on-off switch in the first charging measurement branch and the second test branch,
Capacitor of the photovoltaic array simultaneously into the first charging measurement branch and the second charging measurement branch charges, in t5Moment
The charging of capacitor is zero in one charging measurement branch and the second charging measurement branch, and charging process terminates, and records t5Moment
Sampled voltage V3And this stage current voltage response P3, the sampled voltage V3For the open circuit electricity of charging measurement circuit
Pressure；
Step 6, the same sampled current value I of settingk,
The corresponding electric current I is obtained in current-voltage characteristic curve P1kSampled voltage U1；
The corresponding electric current I is obtained in current-voltage characteristic curve P2kSampled voltage U2；
The corresponding electric current I is obtained in current-voltage characteristic curve P3kSampled voltage U3；
Set another sampled current value Ik+1
Determine the I in current-voltage characteristic curve P1k+1With IkBetween time interval be Δ t1；
Determine the I in current-voltage characteristic curve P2k+1With IkBetween time interval be Δ t2；
Determine the I in current-voltage characteristic curve P3k+1With IkBetween time interval be Δ t3；
It is calculated by formula (1) and obtains the sampled current value I in current-voltage characteristic curve P1, P2 and P3kDifferential value d1, d2 and d3:
It is calculated using equation group (2) and obtains line inductance L and line resistance R:
Wherein U characterizes photovoltaic array end voltage；
Step 7, according to the line inductance L and line resistance R, optimize by error and obtain photovoltaic array and eliminating due to route
Photovoltaic array voltage value to be measured and current value after the error that inductance L and line resistance R is generated；
Step 8, detection terminate, the power resistor on-off switch being closed in the first charging measurement branch and the second test branch, will
The remaining capacity of each capacitor all runs out of, and each capacitor is made to return to zero original state, is then turned off each power resistor on-off
Switch.
5. photovoltaic array I-V characteristic test method according to claim 4, it is characterized in that: error optimization is by such as
Lower step carries out:
Step 5.1 repeats step 1 to step 6, obtains the n group data about line inductance L and line resistance R, utilizes formula (3)
It calculates and obtains target function value Yi:
Yi=Li+RiIki (3),
In formula (3), IKiIt is I in i-th group of dataKValue, Li is the line electricity inductance value in i-th group of data, and Ri is in i-th group of data
Line resistance value, i=1,2,3...n；
Step 5.2 defines least square method fitting function such as formula (4):
Yi=L+RIki(4),
By IkiThe target function value Yi obtained with calculating is according to fitting function shown in formula (4), using least square method march
Line fitting, obtains least square method fit curve equation group (5):
Step 5.3 enables to error the smallest line inductance L's and line resistance R using the equation group (5) calculating acquisition
Value completes error optimization.
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