CN115047266A - Direct current fills electric pile capability test device - Google Patents
Direct current fills electric pile capability test device Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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Abstract
The invention provides a device for testing the performance of a direct current charging pile, which comprises a monitoring end and an analysis end which are connected with each other; the monitoring end is used for plugging a direct current charging pile gun head and simulating a battery power supply to acquire power supply end electric energy parameters and charging interface end output electric energy parameters; and the analysis end is used for analyzing the acquired power supply end electric energy parameters and the acquired charging interface end output electric energy parameters and determining whether the direct current charging pile performance test is abnormal or not according to the analysis result. The invention can automatically monitor and alarm the energy efficiency change, the direct current power quality, the safety performance and the like of the charging pile.
Description
Technical Field
The invention relates to the technical field of charging pile performance testing, in particular to a direct-current charging pile performance testing device.
Background
With the rapid development of new energy automobiles, matched charging facilities are also rapidly developed, and a relatively complete framework system is gradually formed. Governments of various countries have developed a series of industry standards for incentive measures and charging facilities in consideration of environmental protection and sustainable development. China is the best country for supporting the policy of electric automobile charging infrastructure in the world.
The new energy automobile is increasingly popularized, so that the number of related charging equipment is increased sharply, and the quality of charging products is good and uneven. The charging pile is divided into a direct current charging pile and an alternating current charging pile. The direct-current charging pile has the advantages of high charging efficiency, high charging speed and the like, is suitable for the current fast-paced life, gradually replaces the alternating-current charging pile, and becomes a mainstream charging facility in the future; therefore, the method is particularly important for daily troubleshooting and operation maintenance of the direct current charging pile; the field periodicity performance of the charging pile can be detected by using a special detection platform. At present, though some instruments and meters that can be applied to current battery charging outfit installation and go wrong have at home and abroad, but still maintain the difficulty, owing to lack portable detection device in the use in later stage, make the maintainability of equipment not high, this leads to battery charging outfit in long-term use, there may be some potential safety hazards, and often must cut off the power supply in advance when general maintainer overhauls and just can overhaul, maintenance efficiency is low, and the most heavy and inconvenient of current detection equipment is laid, often the turnover is used hard, and long-time handheld operation, neither do benefit to the maintenance and hard fatigue again.
Disclosure of Invention
The invention aims to provide a device for testing the performance of a direct-current charging pile, which can realize the functions of monitoring and alarming energy efficiency change, direct-current power quality, safety performance and the like of the charging pile automatically.
On the one hand, provide a direct current and fill electric pile capability test device, include:
the monitoring end and the analysis end are connected with each other;
the monitoring end is used for inserting a direct current charging pile gun head and simulating a battery power supply to acquire power supply end electric energy parameters and charging interface end output electric energy parameters;
and the analysis end is used for analyzing the acquired power supply end electric energy parameters and the acquired charging interface end output electric energy parameters and determining whether the direct current charging pile performance test is abnormal or not according to the analysis result.
Preferably, the monitoring end comprises a direct current interface module, an analog module, an alternating current interface module, a data acquisition module, a data processing module and a signal control module;
the direct current interface module is respectively connected to the data acquisition module and the simulation module, the data acquisition module is respectively connected to the signal control module and the data processing module, and the alternating current interface module is connected to the data processing module;
the simulation module is used for simulating a battery power supply; the alternating current interface module is used for acquiring electric energy parameters of a power supply end of the charging pile; the direct current interface module is used for acquiring electric energy parameters of the output end of the charging pile; the data acquisition module is used for processing the electric energy parameters acquired by the direct current interface module; and the data processing module is used for processing each parameter converted by the signal control module and controlling the simulation working condition of the simulation module.
Preferably, the data acquisition module is further configured to sample synchronously through the ac interface module and the dc interface module, acquire an output ac active power signal and an output dc active power signal, and calculate the efficiency of the dc charging pile in a sampling period.
Preferably, the data processing module calculates charging efficiency of the charging pile according to the following formula:
wherein eta is charging efficiency of charging pile, P z DC output power, P, collected for a DC interface module j And inputting active power for the alternating current collected by the alternating current interface module.
Preferably, the data acquisition module is further used for respectively calculating various electric energy parameters according to the direct-current three-phase input voltage and current of the charging pile to be tested, and can realize the on-off function of the pin connecting wire of the vehicle direct-current charging interface.
Preferably, the data processing module calculates the output voltage error according to the following formula:
wherein Δ U represents an output voltage error, U CL Indicating a value of the AC input voltageAt a constant value and a load current of 50% of the rated output current, a measured value of the voltage, U, is output Z And the set output voltage setting value is shown.
Preferably, the data processing module is further configured to sample a current waveform at a connection point between the charging pile and the power distribution network, determine a spectral line with the maximum amplitude through preset fourier transform, perform calculation, determine a ratio of the harmonic amplitude to the harmonic frequency, and determine the harmonic content according to the ratio.
Preferably, the simulation module is further used for simulating the initial voltage of the battery, simulating the reverse connection fault of the battery, locking the direct current output of the charging pile and giving an alarm prompt.
Preferably, the dc interface module at least includes a high-permeability core dc sensor, and the high-permeability core dc sensor includes a first magnetic core, a second magnetic core, and a third magnetic core sequentially disposed through a plurality of windings;
a first winding is arranged between the first magnetic core and the second magnetic core, one end of the first winding is respectively connected with a port 1 of an operational amplifier A1A and one end of a resistor R3, the other end of the resistor R3 is respectively connected with one end of a resistor R2 and a port 3 of the operational amplifier, a port 2 of the operational amplifier A1A is respectively connected with the other end of the first winding, one end of a resistor R1, one end of a resistor R19 and one end of a resistor R12, the other end of the resistor R1 and the other end of the resistor R2 are connected with a ground wire, and the other end of the resistor R12 is connected with a port 3 of an operational amplifier A2A;
a second winding is arranged between the second magnetic core and the third magnetic core, one end of the second winding is respectively connected with a port 7 of an operational amplifier A1B, one end of a resistor R7 and one end of a capacitor C7, the other end of the resistor R7 is connected with the other end of the capacitor C7, a port 5 of the operational amplifier A1B is respectively connected with a ground wire and one end of a capacitor C1, a port 6 of the operational amplifier A1B is connected with one end of the resistor R6, the other end of the resistor R6 and the other end of the capacitor C1 are connected with one end of a resistor R5, and the other end of the resistor R5 is respectively connected with one end of a third winding arranged on the first magnetic core;
a fourth winding is arranged on the third magnet core, one end of the fourth winding is connected with one end of a resistor R9, the other end of the resistor R9 is respectively connected with one end of a resistor R10 and one end of a capacitor C3, the other end of the resistor R10 is respectively connected with a port 6 of an operational amplifier A2B and one end of a resistor R11, the other end of the resistor R11 is connected with a port 7 of the operational amplifier A2B and one end of a capacitor C4, the other end of the capacitor C3 is respectively connected with a ground wire and a port 5 of the operational amplifier A2B, a port 4 of the operational amplifier A2B is respectively connected with a port 5 of the operational amplifier A2B, a port 3 of the operational amplifier A1B, one end of the resistor R16 and one end of the resistor R15, the operational amplifier A1B has a port 4 and one end of a fifth winding disposed on the first magnetic core, the other end of the resistor R16 is connected to the other end of the resistor R15, and the other end of the fifth winding is connected to one end of the resistor R4, the other end of the third winding, the other end of the fourth winding, and one end of the resistor R8, respectively.
Preferably, the alternating current interface module at least comprises a zero-flux compensation type alternating current sensor, and the zero-flux compensation type alternating current sensor is composed of a main iron core and an auxiliary iron core which are sequentially arranged through a plurality of windings;
the main iron core is provided with a winding W 1 Winding W b The auxiliary iron core is provided with a winding W 2 Winding W b2 Winding W b One end is connected with a winding W 2 One end, winding W b The other end is connected with a first resistor, a second resistor and a winding W in sequence 2 At the other end, winding W b2 And a third resistor and a fourth resistor are connected in series between the two ends.
In summary, the embodiment of the invention has the following beneficial effects:
according to the direct-current charging pile performance testing device, the charging quantity measuring accuracy is judged by the charging quantity detected in the charging pile using process, the judging result truly reflects the charging quantity measuring accuracy in the charging pile using process, and the charging pile maintenance is ensured to improve the charging quantity measuring accuracy in the charging pile using process; the power supply and the interface end measurement are detected and compared for judgment, the judgment result truly reflects the conversion efficiency in the use process of the charging pile, and the maintenance of the charging pile is ensured; the harmonic alarm and protection functions of the charging station are realized by the alarm function of the electric energy quality online monitoring device, so that the power grid is timely separated from harmonic pollution; monitoring and alarming functions such as energy efficiency change, direct current power quality and safety performance of the charging pile can be automatically realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a dc charging pile performance testing apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a dc sensor with a high-permeability core according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a zero-flux compensated ac sensor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an embodiment of a device for testing a performance of a dc charging pile according to the present invention. In this embodiment, the apparatus comprises:
the monitoring end and the analysis end are connected with each other;
the monitoring end is used for inserting a direct current charging pile gun head and simulating a battery power supply to acquire power supply end electric energy parameters and charging interface end output electric energy parameters; the monitoring end comprises a direct current interface module, an analog module, an alternating current interface module, a data acquisition module, a data processing module and a signal control module; the direct current interface module is respectively connected to the data acquisition module and the simulation module, the data acquisition module is respectively connected to the signal control module and the data processing module, and the alternating current interface module is connected to the data processing module; the simulation module is used for simulating a battery power supply; the alternating current interface module is used for acquiring electric energy parameters of a power supply end of the charging pile; the direct current interface module is used for acquiring electric energy parameters of the output end of the charging pile; the data acquisition module is used for processing the electric energy parameters acquired by the direct current interface module; and the data processing module is used for processing the parameters converted by the signal control module and controlling the simulation working condition of the simulation module.
In this embodiment, the data acquisition module is further configured to acquire the output ac active power signal and the output dc active power signal by synchronously sampling through the ac interface module and the dc interface module, and calculate the efficiency of the dc charging pile in a sampling period. The method for detecting the efficiency of the instantaneous active synchronous direct current charging pile mainly comprises the steps that a direct current and alternating current synchronous sampling sensor circuit is used for synchronously sampling an alternating current active power signal output by an alternating current instantaneous active power measuring circuit and a direct current active power signal output by a direct current instantaneous active power measuring circuit at a high sampling rate, and a main control module calculates the efficiency of the direct current charging pile in a sampling period based on a synchronous sampling value. The efficiency verification of the direct current charging pile is realized; the method improves the detection accuracy, eliminates the asynchronous error of the signal, and has good measurement consistency and accurate measurement.
The charging efficiency is calculated according to the following formula:
wherein eta is the efficiency; p z Outputting power for direct current; p j Active power is input for alternating current.
Specifically, the data acquisition module is further used for calculating various electric energy parameters according to the direct-current three-phase input voltage and current of the charging pile to be tested respectively, and can realize the on-off function of the pin connecting wire of the vehicle direct-current charging interface. Namely, three-phase input voltage and current of the direct current pile to be tested are collected, and voltage, current, power value, power factor, phase and each harmonic are calculated; and outputting direct current voltage and current. The simulation vehicle direct-current charging interface circuit can be realized, and the on-off function of pin connecting lines such as DC +, DC-, PE, S +, S-, CC1, CC2, A +, A-and the like is realized; with the cooperation of direct current stake interface analog circuit, the jump chronogenesis of measurable quantity charging pile state. The analog circuit CAN realize BMS simulation function, and CAN send and receive the CAN communication messages of different PGNs in a simulation manner, and whether the received messages are in compliance is judged. The acquisition module integrates a high-voltage measurement technology, an advanced electromagnetic compatibility design EMC, a high resolution, a differential measurement AD converter and an ideal grounding concept, so that good measurement data acquisition is realized.
Data processing module the data processing module calculates an output voltage error according to the following formula:
wherein Δ U represents an output voltage error, U CL A measured value of the output voltage, U, representing a rated output current with an AC input voltage of a rated value and a load current of 50% Z And the set output voltage setting value is shown. That is, output voltage error verification: the charging pile is connected with a load, the constant voltage state operation is set, the rated voltage is input, the output voltage is set within the output voltage range, the load output current is adjusted to be 50% of the rated current, and the charging pile output voltage Uz is measured respectively. The output voltage error should not exceed ± 0.5%.
The data processing module is further used for sampling current waveforms at the connection position of the charging pile and the power distribution network, determining a spectral line with the maximum amplitude value through preset Fourier transformation, calculating, determining the ratio of the harmonic amplitude value to the harmonic frequency, and determining the harmonic content according to the ratio. Namely, the method for testing the harmonic waves at the input side of the charging pile is to sample the current waveform at the connection part of the charging pile and the power distribution network under different working conditions; on the basis of Fourier transform, a spectral line with the maximum amplitude is used for calculation in the calculation aspect, so that the defect of inaccurate peak point measurement caused by short-range leakage can be properly made up, the detection error is reduced, and the detection effect is improved; the harmonic frequency generated by the rapid-filling pile is mainly m-6 k +/-1 (k-1, 2,3 …, n), namely, 5, 7, 11, 13, 17, 19-th order harmonics and the like are mainly generated. And the harmonic amplitude is inversely proportional to the harmonic number, i.e. the higher the harmonic number, the lower the harmonic content. The direct current harmonic waves output by the charging pile are collected by using a self-developed high-precision direct current transformer, the direct current output by a charging gun interface is sampled and analyzed, and the respective harmonic waves are accurately resolved through FFT (fast Fourier transform) calculation.
In this embodiment, the simulation module is further configured to simulate an initial voltage of the battery, simulate a reverse connection fault of the battery, lock a direct current output of the charging pile, and send an alarm prompt. The direct current pile power supply can simulate faults such as guide resistance change, signal grounding/disconnection and the like, switch on-off logic, and complete all items of direct current pile electrical characteristics, charging guide test and communication consistency test by matching with a power supply and a load. Wherein, the scram function test: fill electric pile connection load to set up and operate under rated load state, press the scram button, fill electric pile and should cut off direct current output immediately. Connection abnormity test: the charger is connected with a load, a connection confirmation contact or a communication contact in the charging connection device is disconnected, charging operation is carried out, the charging pile is required to lock direct current output, the charging pile is arranged to operate under a rated load, the confirmation contact or the communication contact in the charging connection device is disconnected, the charging pile is required to immediately cut off the direct current output and send an alarm prompt. By adopting the modularized programming design, a plurality of subprograms are used, including A D initialization program, delay program, software filtering program, transmission program, display program and the like, and the functions of signal acquisition, signal processing, signal transmission, signal display and the like are completed. The main control module is responsible for coordinating and controlling the operation of the whole system, and calling the needed modules into operation by adopting a calling principle; the AD conversion module is responsible for completing the analog-to-digital conversion of the signal; the display module completes the preliminary processing and display of the signal.
In this embodiment, as shown in fig. 2, the dc interface module at least includes a high-permeability iron core dc sensor, and the high-permeability iron core dc sensor includes a first magnetic core, a second magnetic core, and a third magnetic core sequentially disposed through a plurality of windings; a first winding is arranged between the first magnetic core and the second magnetic core, one end of the first winding is respectively connected with a port 1 of an operational amplifier A1A and one end of a resistor R3, the other end of the resistor R3 is respectively connected with one end of a resistor R2 and a port 3 of the operational amplifier, a port 2 of the operational amplifier A1A is respectively connected with the other end of the first winding, one end of a resistor R1, one end of a resistor R19 and one end of a resistor R12, the other end of the resistor R1 and the other end of the resistor R2 are connected with a ground wire, and the other end of the resistor R12 is connected with a port 3 of an operational amplifier A2A; a second winding is arranged between the second magnetic core and the third magnetic core, one end of the second winding is respectively connected with a port 7 of an operational amplifier A1B, one end of a resistor R7 and one end of a capacitor C7, the other end of the resistor R7 is connected with the other end of the capacitor C7, a port 5 of the operational amplifier A1B is respectively connected with a ground wire and one end of a capacitor C1, a port 6 of the operational amplifier A1B is connected with one end of the resistor R6, the other end of the resistor R6 and the other end of the capacitor C1 are connected with one end of a resistor R5, and the other end of the resistor R5 is respectively connected with one end of a third winding arranged on the first magnetic core; a fourth winding is arranged on the third magnet core, one end of the fourth winding is connected with one end of a resistor R9, the other end of a resistor R9 is respectively connected with one end of a resistor R10 and one end of a capacitor C3, the other end of the resistor R10 is respectively connected with a port 6 of an operational amplifier A2B and one end of a resistor R11, the other end of a resistor R11 is connected with a port 7 of the operational amplifier A2B and one end of a capacitor C4, the other end of the capacitor C3 is respectively connected with a ground wire and a port 5 of the operational amplifier A2B, a port 4 of the operational amplifier A2B is respectively connected with a port 5 of the operational amplifier A2B, a port 3 of the operational amplifier A1B, one end of the resistor R16 and one end of a resistor R15, the port 4 of the operational amplifier A1B and one end of a fifth winding arranged on the first magnetic core, the other end of the resistor R16 is connected with the other end of the resistor R15, and the other end of the fifth winding is respectively connected with one end of the resistor R4, the other end of the third winding, the other end of the fourth winding and one end of the resistor R8. It can be understood that the DC sensor uses the nonlinearity of the high magnetic permeability iron core to directly sample DC, and has an AC detection iron core, so that the DC sensor is a current sensor which can be used from DC to AC and even to audio frequency, and has good response characteristic. It can convert various currents passing through iron core into easily-measured currents, and then the currents are converted into voltage output through standard resistor. The weak signal is used for magnetic modulation to generate direct current, and the key problem of mutual interference between the magnetic modulation and the signal is solved by an electronic shielding method. The resolution of 500A current is below 1ppm, the AC 0 point can be as small as below 1uV, and higher precision can be achieved.
The circuit works around three high-permeability iron cores, a magnet core a, an operational amplifier A1A and a winding 1-2 are used for generating useful direct current by an oscillator, a magnet core b, an operational amplifier A1B and a winding 3-4 are used for eliminating alternating current in oscillation (detected by 5-6), a magnet core c, an operational amplifier A2B and a winding 7-8 are used for external mutation and alternating current detection, the operational amplifier A2A is used for intermediate amplification, and a power amplifier A3 is used for power amplification and outputs feedback current by 10-9.
In this embodiment, as shown in fig. 3, the ac interface module at least includes a zero-flux compensation ac sensor, where the zero-flux compensation ac sensor includes a main iron core and an auxiliary iron core sequentially arranged by a plurality of windings; the main iron core is provided with a winding W 1 Winding W b The auxiliary iron core is provided with a winding W 2 Winding W b2 Winding W b One end is connected with a winding W 2 One end, winding W b The other end is connected with a first resistor, a second resistor and a winding W in sequence 2 At the other end, winding W b2 And a third resistor and a fourth resistor are connected in series between the two ends. It can be understood that the AC sensor uses zero magnetic flux compensation type sensor to make AC sampling, its high accuracy measurement requirement, and uses a series of technical measures of zero magnetic flux compensation principle and passive compensation type weak current sensor development, control winding interlayer voltage, interlayer electric field strength and interlayer capacitance, optimally designed capacitive error compensation circuit, etc. so as to effectively reduce capacitive error. The sensor mainly comprises a main sensor and an auxiliary sensor. The high-precision measurement is achieved mainly through zero magnetic flux compensation, capacitance error reduction and excitation error reduction technical measures.
ⅰ 1 W 1 +ⅰ 2 (W 2 +W b )＝ⅰ 0 W b2
In the formula i 1 W 1 、ⅰ 2 (W 2 +W b )、ⅰ 0 W b2 The primary ampere-turn, the secondary ampere-turn and the excitation ampere-turn of the main sensor are respectively.
And the analysis end is used for analyzing the acquired power supply end electric energy parameters and the acquired charging interface end output electric energy parameters and determining whether the direct current charging pile performance test is abnormal or not according to the analysis result. And peripheral devices such as AD sampling, serial port communication, DA output and the like are controlled, and strict and complex arithmetic is also carried out in the device. The operation and control precision of the whole system is ensured. The serial port can be expanded 232/485 serial port, Ethernet port, USB interface according to the demand. The system supports simplified Chinese, traditional Chinese and English versions, has a humanized and friendly interface, and is simple, convenient and easy to learn. The direct current pile test software is operated to complete the automatic control of test items, data and waveform acquisition, strong report analysis capability, diversified diagram generation function and editable report template.
In summary, the embodiment of the invention has the following beneficial effects:
according to the direct-current charging pile performance testing device, the charging quantity measuring accuracy is judged by using the charging quantity detected in the charging pile using process, the charging quantity measuring accuracy in the charging pile using process is truly reflected by the judgment result, and the charging pile maintenance can improve the charging quantity measuring accuracy in the charging pile using process; the power supply and the interface end measurement are detected and compared for judgment, the judgment result truly reflects the conversion efficiency in the use process of the charging pile, and the maintenance of the charging pile is ensured; the harmonic alarm and protection functions of the charging station are realized by the alarm function of the electric energy quality online monitoring device, so that the power grid is timely separated from harmonic pollution; monitoring and alarming functions such as energy efficiency change, direct current power quality and safety performance of the charging pile can be automatically realized.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. The utility model provides a direct current fills electric pile capability test device which characterized in that includes: the monitoring end and the analysis end are connected with each other;
the monitoring end is used for inserting a direct current charging pile gun head and simulating a battery power supply to acquire power supply end electric energy parameters and charging interface end output electric energy parameters;
and the analysis end is used for analyzing the acquired power supply end electric energy parameters and the acquired charging interface end output electric energy parameters and determining whether the direct current charging pile performance test is abnormal or not according to the analysis result.
2. The device of claim 1, wherein the monitoring end comprises a direct current interface module, an analog module, an alternating current interface module, a data acquisition module, a data processing module and a signal control module;
the direct current interface module is respectively connected to the data acquisition module and the simulation module, the data acquisition module is respectively connected to the signal control module and the data processing module, and the alternating current interface module is connected to the data processing module;
the simulation module is used for simulating a battery power supply; the alternating current interface module is used for acquiring electric energy parameters of a power supply end of the charging pile; the direct current interface module is used for acquiring electric energy parameters of the output end of the charging pile; the data acquisition module is used for processing the electric energy parameters acquired by the direct current interface module; and the data processing module is used for processing each parameter converted by the signal control module and controlling the simulation working condition of the simulation module.
3. The apparatus of claim 2, wherein the data collection module is further configured to sample synchronously through the ac interface module and the dc interface module, collect the output ac active power signal and the output dc active power signal, and calculate the efficiency of the dc charging post during a sampling period.
4. The apparatus of claim 3, wherein the data processing module is according to the following disclosure
The formula calculates the charging efficiency of the charging pile:
wherein eta is charging efficiency of charging pile, P z Is a direct current connectionDC output power, P, collected by the port module j And inputting active power for the alternating current collected by the alternating current interface module.
5. The device of claim 4, wherein the data acquisition module is further configured to calculate each electric energy parameter according to the direct-current three-phase input voltage and current of the charging pile to be tested, and can realize the function of simulating the connection and disconnection of the pin connection line of the vehicle direct-current charging interface.
6. The apparatus of claim 5, wherein the data processing module is according to the following disclosure
Calculating the output voltage error by the formula:
wherein Δ U represents the output voltage error, U CL A measured value of the output voltage, U, representing a rated output current with an AC input voltage of a rated value and a load current of 50% Z And the set output voltage setting value is shown.
7. The device of claim 6, wherein the data processing module is further configured to sample a current waveform at a connection of the charging pile and the power distribution network, determine a spectral line with a maximum amplitude through a preset Fourier transform, calculate the spectral line, determine a ratio of a harmonic amplitude to a harmonic frequency, and determine a harmonic content according to the ratio.
8. The device of claim 7, wherein the simulation module is further configured to simulate an initial voltage of the battery, simulate a reverse connection fault of the battery, and indicate that the charging post should block the dc output and send an alarm.
9. The apparatus of claim 2, wherein the dc interface module comprises at least a high permeability core dc sensor comprising a first magnetic core, a second magnetic core, a third magnetic core arranged in sequence by a plurality of windings;
a first winding is arranged between the first magnetic core and the second magnetic core, one end of the first winding is respectively connected with a port 1 of an operational amplifier A1A and one end of a resistor R3, the other end of the resistor R3 is respectively connected with one end of a resistor R2 and a port 3 of the operational amplifier, a port 2 of the operational amplifier A1A is respectively connected with the other end of the first winding, one end of a resistor R1, one end of a resistor R19 and one end of a resistor R12, the other end of the resistor R1 and the other end of the resistor R2 are connected with a ground wire, and the other end of the resistor R12 is connected with a port 3 of an operational amplifier A2A;
a second winding is arranged between the second magnetic core and the third magnetic core, one end of the second winding is respectively connected with a port 7 of an operational amplifier A1B, one end of a resistor R7 and one end of a capacitor C7, the other end of the resistor R7 is connected with the other end of the capacitor C7, a port 5 of the operational amplifier A1B is respectively connected with a ground wire and one end of a capacitor C1, a port 6 of the operational amplifier A1B is connected with one end of the resistor R6, the other end of the resistor R6 and the other end of the capacitor C1 are connected with one end of a resistor R5, and the other end of the resistor R5 is respectively connected with one end of a third winding arranged on the first magnetic core;
a fourth winding is arranged on the third magnet core, one end of the fourth winding is connected with one end of a resistor R9, the other end of the resistor R9 is respectively connected with one end of a resistor R10 and one end of a capacitor C3, the other end of the resistor R10 is respectively connected with a port 6 of an operational amplifier A2B and one end of a resistor R11, the other end of the resistor R11 is connected with a port 7 of the operational amplifier A2B and one end of a capacitor C4, the other end of the capacitor C3 is respectively connected with a ground wire and a port 5 of the operational amplifier A2B, a port 4 of the operational amplifier A2B is respectively connected with a port 5 of the operational amplifier A2B, a port 3 of the operational amplifier A1B, one end of the resistor R16 and one end of the resistor R15, the operational amplifier A1B has a port 4 and one end of a fifth winding disposed on the first magnetic core, the other end of the resistor R16 is connected to the other end of the resistor R15, and the other end of the fifth winding is connected to one end of the resistor R4, the other end of the third winding, the other end of the fourth winding, and one end of the resistor R8, respectively.
10. The apparatus of claim 2, wherein the ac interface module comprises at least a zero-flux compensation ac sensor having a main core and an auxiliary core sequentially arranged by a plurality of windings;
the main iron core is provided with a winding W 1 Winding W b The auxiliary iron core is provided with a winding W 2 Winding W b2 Winding W b One end is connected with a winding W 2 One end, winding W b The other end is connected with a first resistor, a second resistor and a winding W in sequence 2 At the other end, winding W b2 And a third resistor and a fourth resistor are connected in series between the two ends.
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| CN202210597570.8A CN115047266A (en) | 2022-05-30 | 2022-05-30 | Direct current fills electric pile capability test device |
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| CN202210597570.8A CN115047266A (en) | 2022-05-30 | 2022-05-30 | Direct current fills electric pile capability test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116505633A (en) * | 2023-06-29 | 2023-07-28 | 北京智芯微电子科技有限公司 | Control system and method of charger, charger and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116505633A (en) * | 2023-06-29 | 2023-07-28 | 北京智芯微电子科技有限公司 | Control system and method of charger, charger and storage medium |
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