CN102981421B - Control method for direct-current (DC) load and device thereof - Google Patents
Control method for direct-current (DC) load and device thereof Download PDFInfo
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- CN102981421B CN102981421B CN201210467560.9A CN201210467560A CN102981421B CN 102981421 B CN102981421 B CN 102981421B CN 201210467560 A CN201210467560 A CN 201210467560A CN 102981421 B CN102981421 B CN 102981421B
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Abstract
The invention discloses a control method for DC load and a device thereof. The device can obtain the required DC load value automatically and accurately through adjustment, be arranged as a battery charger or a charging pile of an electric vehicle substation to replace the load of a storage battery, and perform accurate measurement for technical indexes such as stabilized voltage precision, stabilized current precision and ripple factor output by the battery charger or the charging pile. The device is simple and reliable, can finish various tests rapidly and conveniently, and is provided with bright application prospects.
Description
Technical field
The present invention relates to a kind of electric automobile charging station charging set, charging pile method of calibration and equipment, particularly a kind of control method of DC load and equipment.
Background technology
Along with the work of national charging electric vehicle Facilities Construction is carried out, charging set, charging pile occurs after emerging rapidly in large numbersBamboo shoots after a spring rain, for detecting charging set, charging pile performance, country, Southern Power Grid Company is all to charging set, the operation of charging pile controls to propose to explicitly call for and strict regulation, as the GB/T19826-2005 " electric power engineering DC power supply Device-General technical conditions and safety requirements " that formulates, Q/CSG11516.5-2010 " electric automobile non-Vehicular charger charging inlet specification ", Q/CSG11516.3-2010 " the non-Vehicular charger technical manual of electric automobile ", to the charging set precision of voltage regulation in Q/CSG12001-2010 " electric automobile charging station and charging pile acceptance specification ", precision of steady current, ripple factor, conversion efficiency, power factor, the technical indicators such as electric harmonic, computing method and measuring method make clear stipulaties.
In recent years, HF switch change type charging set obtains general accreditation, but will realize charging set and meet these performance index, is only difficult to the performance of in real time, effectively testing charging set by traditional instrument such as multimeter, oscillograph, electric current split-core type meter.Along with the development of technology, domesticly also emerge in large numbers some portable charger characteristic testing devices, number of patent application is 200810099905, but this testing apparatus due to detected object one for the direct supply in transformer station and the present invention be charging set, the detection of charging pile provides a kind of DC load source, mode of connection is also different, and structure is also different.
Summary of the invention
In this context, the present invention more accurately, more easily can adjust the resistance value in DC load source, thus accurately carries out the testing of charging set, charging pile.
For achieving the above object, technical scheme of the present invention is specific as follows:
A control method for DC load, the method comprises: 1. obtain the resistance value that DC load should reach; 2. according to the resistance value that should reach, the resistance value in kind that drop into is determined; 3. compensate according to the resistance value that should the reach difference with the resistance value of input, thus the accurate control of realization to DC load.
The resistance value that DC load of the present invention should reach is that opertaing device is issued DC load and should accurately be adjusted thus the resistance value obtained.
The resistance value in kind that should drop into of the present invention is the resistance value in kind being obtained by the adjustment electric current that passes through of DC load dropping into.
The electric current that the electric current that DC load of the present invention is passed through is passed through by split adjustment, if the electric current passed through is more than or equal to the first threshold current, then drop into the first threshold current module, if the electric current passed through is more than or equal to the second threshold current, be less than the first threshold current, then drop into the second threshold current module.
Split of the present invention represents that the second threshold current value equals the half of the first threshold current value.
Compensation of the present invention represents, first more high-grade electric parameter standard device is utilized to correct DC load, standard device provides the exact value of DC load, DC load adjustment obtains the approximate value of this exact value, then least mean square algorithm is utilized to correct, then the parameter of this least mean square algorithm is fixed, during measurement, according to these fixing parameters, software compensation is carried out to measurement result.
The opertaing device of a kind of DC load of the present invention, described equipment comprises: sequentially connected and composed by collecting unit, CPU (central processing unit), performance element; Wherein: collecting unit, for obtaining the resistance value that DC load should reach from higher level's control module, gather the voltage, the current signal that enter DC load simultaneously; CPU (central processing unit), according to the resistance value that should reach, calculates the electric current that passes through of DC load, thus indirectly determines the resistance value in kind that drop into; Performance element, determine the electric current passed through and the resistance value in kind that should drop into according to CPU (central processing unit) after, by controlling the break-make of determining to drop into current module.
CPU (central processing unit) of the present invention comprises computing unit according to the resistance value that should reach, calculate the electric current that DC load is passed through, thus indirectly determine the resistance value in kind that drop into, computing unit belongs to hardware module, namely first utilizes hardware resistance value to be adjusted to and drop near resistance value; Compensating unit calculates according to the voltage and current signal collected, and determines actual resistance, then carries out software compensation according to least mean square algorithm, belongs to the method utilizing software compensation to carry out accurate adjustment.
Performance element of the present invention comprises break-make module, and relay or metal-oxide-semiconductor can be adopted to carry out control break-make; Resistive module, is provided with multiple threshold current module, and each threshold current module comprises multiple resistance, by controlling at least one resistance in each threshold current module, controlling multiple threshold current module thus obtaining the resistance value that reach.
Performance element of the present invention includes n threshold current module, 1 loop circuit representation first threshold current module, value is charging set to be measured, charging pile is maximum by 60% of electric current, 2 loop circuit representation second threshold current modules, value is the half of the first threshold current value, 3rd threshold current value is the half of the second threshold current value, and the summation of this threshold current is that charging set to be measured, charging pile are maximum by 1.2 times of electric current.
Beneficial effect of the present invention:
1, measuring accuracy is high, is directly completed measurement and the control of various technical parameter by CPU (central processing unit);
2, wiring is simple, more safe and reliable, only in the output line of charging set, charging pile access load meter, direct current resistance load need can be worked as accumulator of electric car and use.The load of electric automobile transformer station charging set, charging pile replacement accumulator can be set to, the technical indicator such as the band precision of voltage regulation, precision of steady current, ripple factor that charging set, charging pile export is measured accurately
3, automatically control, load meter carries out precision adjustment to resistance automatically.This equipment is simple, reliable, can complete every test quickly and easily, have stronger application prospect.
Below in conjunction with the drawings and specific embodiments, the present invention is further explained.
Accompanying drawing explanation
Fig. 1 is the DC load control method schematic flow sheet of one embodiment of the invention;
Fig. 2 is the DC load control method schematic flow sheet of another embodiment of the present invention;
Fig. 3 is the DC load opertaing device structural representation of the embodiment of the present invention;
Fig. 4 is the DC load performance element structural representation of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further details.
A control method for DC load, the method comprises: 1. obtain the resistance value that DC load should reach; 2. according to the resistance value that should reach, the resistance value in kind that drop into is determined; 3. compensate according to the resistance value that should the reach difference with the resistance value of input, thus the accurate control of realization to DC load.
The resistance value that DC load of the present invention should reach is that opertaing device is issued DC load and should accurately be adjusted thus the resistance value obtained.
The resistance value in kind that should drop into of the present invention is the resistance value in kind being obtained by the adjustment electric current that passes through of DC load dropping into.
The electric current that the electric current that DC load of the present invention is passed through is passed through by split adjustment, if the electric current passed through is more than or equal to the first threshold current, then drop into the first threshold current module, if the electric current passed through is more than or equal to the second threshold current, be less than the first threshold current, then drop into the second threshold current module.
Split of the present invention represents that the second threshold current value equals the half of the first threshold current value.
Compensation of the present invention represents, first more high-grade electric parameter standard device is utilized to correct DC load, standard device provides the exact value of DC load, DC load adjustment obtains the approximate value of this exact value, then least mean square algorithm is utilized to correct, then the parameter of this least mean square algorithm is fixed, during measurement, according to these fixing parameters, software compensation is carried out to measurement result.
The opertaing device of a kind of DC load of the present invention, described equipment comprises: sequentially connected and composed by collecting unit, CPU (central processing unit), performance element; Wherein: collecting unit, for obtaining the resistance value that DC load should reach from higher level's control module, gather the voltage, the current signal that enter DC load simultaneously; CPU (central processing unit), according to the resistance value that should reach, calculates the electric current that passes through of DC load, thus indirectly determines the resistance value in kind that drop into; Performance element, determine the electric current passed through and the resistance value in kind that should drop into according to CPU (central processing unit) after, by controlling the break-make of determining to drop into current module.
CPU (central processing unit) of the present invention comprises computing unit according to the resistance value that should reach, calculate the electric current that DC load is passed through, thus indirectly determine the resistance value in kind that drop into, computing unit belongs to hardware module, namely first utilizes hardware resistance value to be adjusted to and drop near resistance value; Compensating unit calculates according to the voltage and current signal collected, and determines actual resistance, then carries out software compensation according to least mean square algorithm, belongs to the method utilizing software compensation to carry out accurate adjustment.
Performance element of the present invention comprises break-make module, and relay or metal-oxide-semiconductor can be adopted to carry out control break-make; Resistive module, is provided with multiple threshold current module, and each threshold current module comprises multiple resistance, by controlling at least one resistance in each threshold current module, controlling multiple threshold current module thus obtaining the resistance value that reach.
Performance element of the present invention includes n threshold current module, 1 loop circuit representation first threshold current module, value is charging set to be measured, charging pile is maximum by 60% of electric current, 2 loop circuit representation second threshold current modules, value is the half of the first threshold current value, 3rd threshold current value is the half of the second threshold current value, and the summation of this threshold current is that charging set to be measured, charging pile are maximum by 1.2 times of electric current.
Embodiments provide a kind of control method of DC load, as shown in Figure 1, Fig. 1 is the method correcting DC load, can comprise following content:
The resistance value that the DC load that S101 obtains to be needed should reach
In this step, the maximum charging current determination DC load different according to charging set, charging pile should reach different current values,
If charging set maximum output voltage is 700V, now output current is 10A, the resistance value that then DC load should reach is 70 Ω, in addition different according to charging set, charging pile charge modes, the current value that the DC load determined should reach is also different, as under voltage stabilizing state, be in the floating charge stage, voltage compare is high, and electric current is smaller, the resistance value that then should reach is just larger, and under current stabilization state, being in constant-current phase, voltage compare is low, electric current is larger, then the resistance value that should reach is just smaller.S102 determines the resistance value dropped into according to the resistance value of DC load
In this step, determine that the resistance value dropped into is undertaken determining by the current value of input, current value is set by threshold current, first threshold current is charging set to be measured, charging pile is maximum by 60% of electric current, second threshold current value is the half of the first threshold current value, 3rd threshold current value is the half of the second threshold current value, total n threshold current value always, the summation of this threshold current is charging set to be measured, maximum 1.2 times of passing through electric current of charging pile, meet charging set, the test specification of charging pile, then according to the resistance value that DC load will reach, the magnitude of voltage collected, determine the threshold current module needing to drop into, till determining that dropping into resistance value needs the resistance value reached closest to DC load always.
S103 carries out software correction to the resistance of DC load
In this step, generally, still there is certain difference in the resistance value that DC load should reach and the resistance value after adjusting, least mean square algorithm and Least mean square algorithm is utilized to compensate in this step, this step only has just needs when correcting DC load, more high-grade electric parameter standard device is utilized to correct DC load, standard device provides the exact value of DC load, DC load adjustment obtains the approximate value of this exact value, then least mean square algorithm is utilized to correct, after obtaining LMS least mean square, the parameter of this least mean square algorithm is fixed, only need during measurement to carry out software correction according to these fixing parameters to measurement result.
S104 controls DC load according to the resistance value of the resistance value dropped into and correction
Then according to the resistance value that DC load will reach, the magnitude of voltage collected, determines the threshold current module needing to drop into, till determining that dropping into resistance value needs the resistance value reached closest to DC load always.
As shown in Figure 2, method when Fig. 2 is DC load work, can comprise following content:
The resistance value that the DC load that S201 obtains to be needed should reach
In this step, according to charging set, the different maximum charging current determination DC load of charging pile should reach different current values, if charging set maximum output voltage is 700V, now output current is 10A, the resistance value that then DC load should reach is 70 Ω, in addition according to charging set, the charge mode that charging pile is different, the current value that the DC load determined should reach is also different, as under voltage stabilizing state, be in the floating charge stage, voltage compare is high, electric current is smaller, the resistance value that then should reach is just larger, and under current stabilization state, be in constant-current phase, voltage compare is low, electric current is larger, the resistance value that then should reach is just smaller.S202 determines the resistance value dropped into according to the resistance value of DC load
In this step, determine that the resistance value dropped into is undertaken determining by the current value of input, current value is set by threshold current, first threshold current is charging set to be measured, charging pile is maximum by 60% of electric current, second threshold current value is the half of the first threshold current value, 3rd threshold current value is the half of the second threshold current value, total n threshold current value always, the summation of this threshold current is charging set to be measured, maximum 1.2 times of passing through electric current of charging pile, meet charging set, the test specification of charging pile, then according to the resistance value that DC load will reach, the magnitude of voltage collected, determine the threshold current module needing to drop into, till determining that dropping into resistance value needs the resistance value reached closest to DC load always.
S203 controls DC load according to the resistance value of the resistance value dropped into and correction
Then according to the resistance value that DC load will reach, the magnitude of voltage collected, determines the threshold current module needing to drop into, till determining that dropping into resistance value needs the resistance value reached closest to DC load always.According to the parameter of the least mean square algorithm obtained after timing LMS least mean square, according to the parameter that these are fixing, software correction is carried out to measurement result.
By the way in the present embodiment, it is more accurate to make the control of DC load, thus also for the measurement of charging set, charging pile provides the load more tallied with the actual situation.
As shown in Fig. 1 Fig. 2, the control method in the method major equipment calibration or verification process that Fig. 1 describes, the method that Fig. 2 describes is mainly equipment as control method when test specimen and accumulator.
The present invention additionally provides a kind of DC load opertaing device in example, as shown in Figure 3, this equipment mainly comprises:
Collecting unit, for obtaining the resistance value that DC load should reach from higher level's control module, gathers the voltage, the current signal that enter DC load simultaneously;
CPU (central processing unit), according to the resistance value that should reach, calculates the electric current that passes through of DC load, thus indirectly determines the resistance value in kind that drop into; CPU (central processing unit) comprises computing unit according to the resistance value that should reach, and calculates the electric current that passes through of DC load, thus indirectly determines the resistance value in kind that drop into; Compensating unit calculates according to the voltage and current signal collected, and determines actual resistance, then carries out software compensation according to least mean square algorithm.
Performance element, determine the electric current passed through and the resistance value in kind that should drop into according to CPU (central processing unit) after, by controlling the break-make of determining to drop into current module; Performance element comprises break-make module and relay or metal-oxide-semiconductor can be adopted to carry out control break-make; Resistive module is provided with multiple threshold current module, and each threshold current module comprises multiple resistance, by controlling at least one resistance in each threshold current module, controlling multiple threshold current module thus obtaining the resistance value that reach.
Composition graphs 4 introduces the principle of work of lower performance element, performance element has n threshold current module, 1 loop circuit representation first threshold current module, value is charging set to be measured, charging pile is maximum by 60% of electric current, 2 loop circuit representation second threshold current modules, value is the half of the first threshold current value, 3rd threshold current value is the half of the second threshold current value, the summation of this threshold current is charging set to be measured, maximum 1.2 times of passing through electric current of charging pile, meet charging set, the test specification of charging pile, each threshold current module comprises multiple resistance, each threshold current module is by controlling at least one resistance in each threshold current module, control method is the K switch 1 in each module, K2, until Kn, K switch 1, K2, until Kn can be controlled by relay or metal-oxide-semiconductor, the resistance value that the break-make thus obtain controlling multiple threshold current module reach.
Claims (10)
1. a control method for DC load, is characterized in that, the method comprises: 1. obtain the resistance value that DC load should reach; 2. according to the resistance value that should reach, the resistance value in kind that drop into is determined; 3. compensate according to the resistance value that should the reach difference with the resistance value of input, thus the accurate control of realization to DC load.
2. the control method of a kind of DC load according to claim 1, is characterized in that, the resistance value that described DC load should reach is that opertaing device is issued DC load and should accurately be adjusted thus the resistance value obtained.
3. the control method of a kind of DC load according to claim 1, is characterized in that, the described resistance value in kind that should drop into is the resistance value in kind being obtained by the adjustment electric current that passes through of DC load dropping into.
4. the control method of a kind of DC load according to claim 3, it is characterized in that, the electric current that the electric current that described DC load is passed through is passed through by split adjustment, if the electric current passed through is more than or equal to the first threshold current, then drop into the first threshold current module, if the electric current passed through is more than or equal to the second threshold current, be less than the first threshold current, then drop into the second threshold current module.
5. the control method of a kind of DC load according to claim 4, is characterized in that, described split represents that the second threshold current value equals the half of the first threshold current value.
6. the control method of a kind of DC load according to claim 1, it is characterized in that, described compensation represents, first more high-grade electric parameter standard device is utilized to correct DC load, standard device provides the exact value of DC load, and DC load adjustment obtains the approximate value of this exact value, then utilizes least mean square algorithm to correct, then the parameter of this least mean square algorithm is fixed, during measurement, according to these fixing parameters, software compensation is carried out to measurement result.
7. an opertaing device for DC load, is characterized in that, described equipment comprises: sequentially connected and composed by collecting unit, CPU (central processing unit), performance element; Wherein:
Collecting unit, for obtaining the resistance value that DC load should reach from higher level's control module, gathers the voltage, the current signal that enter DC load simultaneously;
CPU (central processing unit), according to the resistance value that should reach, calculates the electric current that passes through of DC load, thus indirectly determines the resistance value in kind that drop into;
Performance element, determine the electric current passed through and the resistance value in kind that should drop into according to CPU (central processing unit) after, by controlling the break-make of determining to drop into current module.
8. the opertaing device of a kind of DC load according to claim 7, it is characterized in that, described CPU (central processing unit) comprises computing unit according to the resistance value that should reach, calculate the electric current that DC load is passed through, thus indirectly determine the resistance value in kind that drop into, computing unit belongs to hardware module, namely first utilizes hardware resistance value to be adjusted to and drop near resistance value; Compensating unit calculates according to the voltage and current signal collected, and determines actual resistance, then carries out software compensation according to least mean square algorithm, belongs to the method utilizing software compensation to carry out accurate adjustment.
9. the opertaing device of a kind of DC load according to claim 7, is characterized in that, described performance element comprises break-make module, and relay or metal-oxide-semiconductor can be adopted to carry out control break-make; Resistive module, is provided with multiple threshold current module, and each threshold current module comprises multiple resistance, by controlling at least one resistance in each threshold current module, controlling multiple threshold current module thus obtaining the resistance value that reach.
10. the opertaing device of a kind of DC load according to claim 7 or 9, it is characterized in that, described performance element includes n threshold current module, 1 loop circuit representation first threshold current module, value is charging set to be measured, charging pile is maximum by 60% of electric current, 2 loop circuit representation second threshold current modules, value is the half of the first threshold current value, 3rd threshold current value is the half of the second threshold current value, and the summation of this threshold current is that charging set to be measured, charging pile are maximum by 1.2 times of electric current.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105182251A (en) * | 2015-09-30 | 2015-12-23 | 国家电网公司 | DC load automatic loading device |
| CN105676025A (en) * | 2016-01-05 | 2016-06-15 | 天津大学 | Detection artificial load for movable electric vehicle charger |
| CN107942159B (en) * | 2017-11-03 | 2020-07-03 | 国网浙江省电力公司电动汽车服务分公司 | Power test load of direct current charger |
| CN108983671B (en) * | 2018-08-07 | 2020-11-06 | 中国石油大学(华东) | Constant-current control device for alternating-current interference corrosion experiment |
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