Programmable DC power supply test method for new energy charging pile

Abstract

The invention discloses a programmable DC power supply test method for a new energy charging pile, relates to the technical field of charging pile operation detection, and improves the safety and reliability of charging pile operation. According to the invention, a plurality of test states are set for the to-be-tested charging pile, a plurality of cyclic load operation tests are carried out on the to-be-tested charging pile in different test states, and various detection parameters and a standard slope change curve and a standard change interval combination in the test states are extracted from a load test operation record; and judging the current load state of the to-be-detected charging pile according to the real-time operation data, further calling a corresponding standard slope change curve and a standard change interval combination, comparing the real-time operation data with the standard slope change curve and the standard change interval combination, and further judging whether the current operation state of the to-be-detected charging pile is abnormal or not.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile operation detection, and specifically to a programmable DC power supply test method for new energy charging piles. Background Art

[0002] With the wide popularization of electric vehicles, charging piles, as important infrastructure for electric vehicles, their safe and stable operation has become crucial. Accurately detecting the performance and operating status of charging piles and timely discovering potential faults and abnormal conditions are of great significance for ensuring the charging safety and charging efficiency of electric vehicles.

[0003] Currently, traditional charging pile detection methods often have certain limitations. On the one hand, during the detection process, the performance evaluation of charging piles under different load conditions and test states is not comprehensive and accurate enough, and it is difficult to simulate the complex and changeable situations in actual application scenarios. Traditional detection may only set single detection parameters and test states, and cannot reflect the true operating conditions of charging piles under various grid conditions and vehicle loads. On the other hand, existing detection methods are not efficient and accurate enough in real-time monitoring and abnormal judgment. Lack of a deep analysis and comparison mechanism for real-time operating data of charging piles, and cannot timely judge whether the charging pile is in a normal operating state according to real-time data, which easily leads to untimely discovery of faults, and then affects the charging safety and user experience of electric vehicles. Therefore, a programmable DC power supply test method for new energy charging piles is provided. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a programmable DC power supply test method for new energy charging piles.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A programmable DC power supply test method for new energy charging piles, comprising the following steps:

[0007] Step S1, deploy multiple groups of programmable DC power supply units, set different detection parameters for each group of programmable DC power supply units, and then electrically connect each group of programmable DC power supply units to the charging pile to be tested;

[0008] Step S2, set multiple test states for the charging pile to be tested, and then perform several cyclic load operation tests on each group of programmable DC power supply units and the charging pile to be tested under different test states, and generate several load test operation records;

[0009] Step S3, extract various detection parameters, standard slope change curves and standard change interval combinations under various test states from the load test operation records;

[0010] Step S4: Obtain the load parameters of the power grid or vehicle accessing the to-be-tested charging pile, collect multiple pieces of real-time operation data of the to-be-tested charging pile, judge the current load status of the to-be-tested charging pile based on the real-time operation data, and then retrieve the corresponding standard slope change curve and standard change interval combination, and compare the real-time operation data with the standard slope change curve and the standard change interval combination, so as to judge whether there is an abnormality in the current operation state of the to-be-tested charging pile.

[0011] Furthermore, the programmable DC power supply unit is equipped with a power output unit, a voltage sensor, a current sensor, a temperature sensor and a communication interface;

[0012] Set output parameters for each programmable DC power supply unit through the host computer software, and the output parameters include voltage parameters, current parameters, charging mode, voltage fluctuation range or frequency fluctuation range;

[0013] Number each programmable DC power supply unit, and electrically connect each programmable DC power supply unit to the to-be-tested charging pile in turn. The to-be-tested charging pile is provided with multiple groups of power supply units.

[0014] Furthermore, the test states include a steady-state test state, a transient test state and an overload test state;

[0015] Furthermore, the execution process of the cyclic load operation test includes:

[0016] Electrically connect each programmable DC power supply unit to the to-be-tested charging pile in turn. According to the output parameters carried by the programmable DC power supply unit, the to-be-tested charging pile adaptively connects to the charging load or the power grid access load of the programmable DC power supply unit;

[0017] Then, make the to-be-tested charging pile perform n cyclic load operation tests with the programmable DC power supply unit in each test state respectively. After each cyclic load operation test, reset the to-be-tested charging pile and the programmable DC power supply unit to the state before the cyclic load operation test. n is a natural number greater than 50;

[0018] Whenever a cyclic load operation test ends, the programmable DC power supply unit collects the voltage change curve, current change curve and temperature change curve of the power supply unit connected to the to-be-tested charging pile through the voltage sensor, current sensor and temperature sensor;

[0019] Then, integrate the data of each power supply unit under each cyclic load operation test to generate a load test operation record, and mark the programmable DC power supply unit number and the test state on the load test operation record.

[0020] Furthermore, the obtaining process of the standard change interval combination includes:

[0021] Classify each load test run record according to the types of detection parameters and test status carried by the programmable DC power supply unit corresponding to the load test run record.

[0022] Establish a multi-dimensional coordinate system and map the data in the load test run records with the same programmable DC power supply unit number and test status to the same multi-dimensional coordinate system.

[0023] For the load test run records whose test status includes the steady-state test status, set several time periods and divide each change curve in the load test run record into several curve segments through the time periods.

[0024] Perform a normal distribution on the curve segments of each time period, and select the central part of the values and the values with a difference of 0.1 at both the positive and negative ends according to the normal distribution results, which are recorded as the standard curve segment intervals corresponding to the time periods.

[0025] Connect the standard curve segment intervals of each time period in sequence according to the time order, and then obtain the standard change interval combination under the corresponding detection parameter and test status group.

[0026] Furthermore, the process of obtaining the standard slope change curve includes:

[0027] Map the standard change interval combinations corresponding to the same types of detection parameters and test status to the same multi-dimensional coordinate system, perform integral processing on the standard curve intervals in each standard change interval combination, and obtain the slope change curves corresponding to each standard curve segment interval.

[0028] Set a density detection frame, where the length of the density detection frame is equal to the length of the time period and the width is a preset value. Then, traverse the slope change curves of each time period along the direction perpendicular to the time coordinate axis through the density detection frame, and select the part with the largest density of the slope change curve segments in each time period according to the traversal results as the standard slope change curve segment corresponding to the time period.

[0029] Connect the standard slope change curve segments of each time period in sequence according to the time order, and then obtain multiple standard slope change curves under the corresponding types of detection parameters and test status combinations.

[0030] Furthermore, the process of determining whether there is an abnormality in the current operating state of the to-be-tested charging pile includes:

[0031] Obtain the load parameters of the vehicle or power grid connected to the to-be-tested charging pile in the actual application scenario, where the types of detection parameters are the same as those carried by the programmable DC power supply unit.

[0032] Set a status monitoring period. Whenever a status monitoring period starts, collect multiple pieces of real-time operation data of the power supply unit to which the charging pile to be tested is connected. The real-time operation data includes a real-time voltage change curve, a real-time current change curve, and a real-time temperature change curve.

[0033] Retrieve the standard slope change curve and the standard change interval combination corresponding to the same detection parameters according to the data types included in the load parameters. Judge the current load status of the corresponding power supply unit in real time based on the real-time voltage change curve and the real-time current change curve. The types of the current load status are the same as the types of the test status.

[0034] Furthermore, screen the currently retrieved standard slope change curve and the standard change interval combination according to the current load status, and compare the screened standard change interval combination with the real-time operation data.

[0035] If any piece of real-time operation data is not within the standard change interval, it is judged that there is a load abnormality in the charging pile to be tested under the corresponding status monitoring period. Otherwise, no operation is performed.

[0036] At the same time, splice the real-time operation data of the current status monitoring period and the previous status monitoring period and map them in the same coordinate system to obtain the slope change curve corresponding to the real-time operation data, and compare the slope change curve with the standard change interval combination.

[0037] If any slope change curve is not within the corresponding standard change interval, it is judged that there is a load abnormality in the charging pile to be tested under the corresponding status monitoring period. Otherwise, no operation is performed.

[0038] Furthermore, if it is judged that there is an abnormality in the charging pile to be tested in three consecutive status monitoring periods, or if it is judged that a slope change curve is not within the corresponding standard change interval and a piece of real-time operation data is not within the standard change interval at the same time within one status monitoring period, then directly judge that the charging pile to be tested cannot be used, and send a maintenance decision to the relevant staff. Otherwise, no operation is performed.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] 1. By setting multiple test statuses for the charging pile to be tested and performing several cyclic load operation tests, the detection process of the present invention is more comprehensive and in-depth, and can more accurately evaluate the performance of the charging pile in different actual scenarios, making up for the deficiencies of traditional detection methods in simulating complex working conditions.

[0041] 2. By obtaining the load parameters of the power grid or vehicle connected to the charging pile to be tested, collecting multiple pieces of real-time operation data, and judging the current load status based on the real-time data, and then retrieving the corresponding standards for comparison, the present invention realizes timely detection of whether there is an abnormality in the charging pile to be tested under the current operating state, realizes rapid response to the operating state of the charging pile and fault warning, greatly improves the safety and reliability of the charging pile operation, and reduces the potential safety hazards and inconvenience in use caused by the charging pile failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention.

[0043] Figure 1 It is a flowchart of the method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present invention.

[0045] As Figure 1 shown, a programmable DC power supply test method for a new energy charging pile includes the following steps:

[0046] Step S1: Deploy multiple groups of programmable DC power supply units, set different detection parameters for each group of programmable DC power supply units, and then electrically connect each group of programmable DC power supply units to the charging pile to be tested;

[0047] Step S2: Set multiple test states for the charging pile to be tested, and then perform several cyclic load operation tests on each group of programmable DC power supply units and the charging pile to be tested in different test states, and generate several load test operation records;

[0048] Step S3: Extract various detection parameters, standard slope change curves and standard change interval combinations in the test state from the load test operation records;

[0049] Step S4: Obtain the load parameters of the power grid or vehicle connected to the to-be-tested charging pile, collect multiple pieces of real-time operation data of the to-be-tested charging pile, judge the current load status of the to-be-tested charging pile based on the real-time operation data, and then retrieve the corresponding standard slope change curve and standard change interval combination, and compare the real-time operation data with the standard slope change curve and standard change interval combination, so as to judge whether there is an abnormality in the current operation state of the to-be-tested charging pile.

[0050] Further, the step S1 is implemented through the following process:

[0051] The programmable DC power supply unit is equipped with a power output unit, a voltage sensor, a current sensor, a temperature sensor and a communication interface;

[0052] Set the output parameters for each programmable DC power supply unit through the host computer software, and the output parameters include voltage parameters, current parameters, charging mode, voltage fluctuation range or frequency fluctuation range;

[0053] For example, when the programmable DC power supply unit is used to simulate the power grid to input energy to the to-be-tested charging pile, the voltage fluctuation range of the programmable DC power supply unit can rise from 220V to 240V at a rate of 10V per minute, and then drop to 200V, and its frequency fluctuation range can be adjusted from 50Hz to 49Hz and 51Hz;

[0054] When the programmable DC power supply unit is used to simulate the vehicle battery connecting to the to-be-tested charging pile for charging, the voltage parameters and current parameters of the programmable DC power supply unit are constant current and constant voltage, and the charging mode is divided into constant current charging mode and constant voltage charging mode;

[0055] It should be noted that the output parameters of each programmable DC power supply unit are not completely the same. For example, there are programmable DC power supply units with the same voltage parameters, current parameters and voltage fluctuation range, but different frequency fluctuation ranges, that is, there are one or more types of differences in the output parameters between each programmable DC power supply unit;

[0056] Set numbers a1, a2, a3, ……, a n for each programmable DC power supply unit, where n is a natural number greater than 0;

[0057] Connect each programmable DC power supply unit to the to-be-tested charging pile electrically in sequence. The to-be-tested charging pile is provided with multiple groups of power supply units and is distributed in a ring shape, so that the to-be-tested charging pile can be electrically connected to multiple groups of programmable DC power supply units at the same time.

[0058] Further, the step S2 is implemented through the following process:

[0059] Set multiple test states for the charging pile to be tested, and the test states include a steady-state test state, a transient test state, and an overload test state;

[0060] The steady-state test state means that the charging pile to be tested operates with a rated power as a constant output power under load;

[0061] The transient test state means that the charging pile to be tested operates with a fluctuating voltage or current under load. For example, the load current is stepped from 0 A to 200 A within 1 second and then suddenly drops to 50 A, repeating 10 times;

[0062] The overload test state means that the charging pile to be tested operates with a power exceeding the rated power under load. For example, the charging pile to be tested is operated at 120% of the rated power for 5 minutes;

[0063] Connect each programmable DC power supply unit to the charging pile to be tested electrically in sequence. According to the output parameters carried by the programmable DC power supply unit, the charging pile to be tested adaptively connects to the charging load or the grid access load with the programmable DC power supply unit;

[0064] Furthermore, make the charging pile to be tested perform n - cycle load operation tests with the programmable DC power supply unit in each test state respectively. After each cycle of load operation test, reset the charging pile to be tested and the programmable DC power supply unit to the state before the cycle of load operation test. n is a natural number greater than 50;

[0065] Whenever a cycle of load operation test ends, the programmable DC power supply unit collects the voltage change curve, current change curve, and temperature change curve of the power supply unit connected to the charging pile to be tested through voltage sensors, current sensors, and temperature sensors;

[0066] Furthermore, integrate the data of each power supply unit under each cycle of load operation test to generate a load test operation record, and mark the programmable DC power supply unit number and test state on the load test operation record.

[0067] Further, the step S3 is implemented through the following process:

[0068] Classify each load test operation record according to the types of detection parameters carried by the programmable DC power supply unit corresponding to the load test operation record and the test state;

[0069] Establish a multi - dimensional coordinate system, and map the data in the load test operation records with the same programmable DC power supply unit number and test state into the same multi - dimensional coordinate system;

[0070] For the load test run records with test status including steady-state test status, set several time segments, and divide each change curve in the load test run records into several curve segments through the time segments;

[0071] Perform normal distribution on the curve segments of each time segment, and select the central part of the values and the values with a difference of 0.1 at both positive and negative ends according to the normal distribution results, which are recorded as the standard curve segment intervals corresponding to the time segments;

[0072] Connect the standard curve segment intervals of each time segment in chronological order, and then obtain the standard change interval combination corresponding to the detection parameter and the test status group;

[0073] Furthermore, map the standard change interval combinations corresponding to the same type of detection parameters and test status to the same multi-dimensional coordinate system, perform integral processing on the standard curve intervals in each standard change interval combination, and obtain the slope change curves corresponding to each standard curve segment interval;

[0074] Set a density detection frame, where the + of the density detection frame is equal to the length of the time segment and the width is a preset value. Then, traverse the slope change curves of each time segment along the direction perpendicular to the time axis through the density detection frame, and select the part with the largest density of the slope change curve segments in each time segment according to the traversal results as the standard slope change curve segment corresponding to the time segment;

[0075] Connect the standard slope change curve segments of each time segment in chronological order, and then obtain multiple standard slope change curves corresponding to the type of detection parameter and the test status combination;

[0076] Furthermore, step S4 is implemented through the following process:

[0077] Obtain the load parameters of the vehicles or power grids connected to the to-be-tested charging pile in the actual application scenario, where the types of detection parameters are the same as those of the programmable DC power supply unit;

[0078] Set a status monitoring period. Whenever a status monitoring period starts, collect multiple real-time operation data of the power supply unit connected to the to-be-tested charging pile, where the real-time operation data includes real-time voltage change curve, real-time current change curve, and real-time temperature change curve;

[0079] Retrieve the standard slope change curve and the standard change interval combination corresponding to the same detection parameter according to the data types included in the load parameters, and judge the current load status of the corresponding power supply unit in real time according to the real-time voltage change curve and the real-time current change curve, where the types of the current load status are the same as those of the test status;

[0080] Furthermore, according to the current load status, the currently retrieved standard slope change curve and the standard change interval combination are screened, and the screened standard change interval combination is compared with the real-time operation data;

[0081] If any real-time operation data is not within the standard change interval, it is determined that there is a load abnormality in the charging pile to be measured under the corresponding status monitoring period, otherwise no operation is performed;

[0082] At the same time, the real-time operation data of the current status monitoring period and the previous status monitoring period are spliced and mapped in the same coordinate system to obtain the slope change curve corresponding to the real-time operation data, and the slope change curve is compared with the standard change interval combination;

[0083] If any slope change curve is not within the corresponding standard change interval, it is determined that there is a load abnormality in the charging pile to be measured under the corresponding status monitoring period, otherwise no operation is performed;

[0084] If it is determined that there is an abnormality in the charging pile to be measured for three consecutive status monitoring periods, or if it is simultaneously determined within one status monitoring period that a slope change curve is not within the corresponding standard change interval and a real-time operation data is not within the standard change interval, then it is directly determined that the charging pile to be measured cannot be used, and a maintenance decision is sent to the relevant staff, otherwise no operation is performed.

[0085] The above embodiments are only used to illustrate the technical method of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A programmable DC power supply test method for new energy charging piles, characterized in that It includes the following steps: Step S1: Deploy multiple groups of programmable DC power supply units, set different detection parameters for each group of programmable DC power supply units, and then electrically connect each group of programmable DC power supply units to the charging pile to be tested; Step S2: Set multiple test states for the charging pile to be tested, and then perform several cyclic load operation tests on each group of programmable DC power supply units and the charging pile to be tested in different test states, and then generate several load test operation records; Step S3: Extract various detection parameters, standard slope change curves and standard change interval combinations in the test state from the load test operation records; Step S4: Obtain the load parameters of the power grid or vehicle connected to the charging pile to be tested, collect multiple real-time operation data of the charging pile to be tested, judge the current load state of the charging pile to be tested according to the real-time operation data, and then retrieve the corresponding standard slope change curve and standard change interval combination, and compare the real-time operation data with the standard slope change curve and standard change interval combination, so as to judge whether there is an abnormality in the charging pile to be tested in the current operation state.

2. A programmable DC power supply testing method for new energy charging piles according to claim 1, characterized in that, The programmable DC power supply unit is equipped with a power output unit, a voltage sensor, a current sensor, a temperature sensor and a communication interface; Set output parameters for each programmable DC power supply unit, and the output parameters include voltage parameters, current parameters, charging mode, voltage fluctuation range or frequency fluctuation range; Set numbers for each programmable DC power supply unit, and electrically connect each programmable DC power supply unit to the charging pile to be tested in turn. The charging pile to be tested is provided with multiple groups of power supply units.

3. A programmable DC power supply testing method for a new energy charging pile according to claim 1, characterized in that, The test states include a steady-state test state, a transient test state and an overload test state.

4. A programmable DC power supply test method for a new energy charging pile according to claim 3, characterized in that, The execution process of the cyclic load operation test includes: Electrically connect each programmable DC power supply unit to the charging pile to be tested in turn. According to the output parameters carried by the programmable DC power supply unit, the charging pile to be tested adaptively performs a charging load or a power grid access load with the programmable DC power supply unit; Then, let the charging pile to be tested perform n cyclic load operation tests with the programmable DC power supply unit in each test state respectively. After each cyclic load operation test, reset the charging pile to be tested and the programmable DC power supply unit to the state before the cyclic load operation test. n is a natural number greater than 50; Whenever a cyclic load operation test ends, the programmable DC power supply unit collects the voltage change curve, current change curve and temperature change curve of the power supply unit connected to the charging pile to be tested through the voltage sensor, current sensor and temperature sensor; Integrate the data of each power supply unit under each cyclic load operation test to generate a load test operation record, and mark the programmable DC power supply unit number and the test state.

5. A programmable DC power supply testing method for a new energy charging pile according to claim 4, characterized in that, The acquisition process of the standard change interval combination includes: Establish a multi-dimensional coordinate system, and map the data in the load test operation records with the same programmable DC power supply unit number and test state to the same multi-dimensional coordinate system; Set a number of time intervals, and divide each change curve in the load test run record into a number of curve segments through the time intervals. Perform a normal distribution on the curve segments of each time interval, select the standard curve segment interval corresponding to the time interval according to the normal distribution result, and connect the standard curve segment intervals of each time interval in chronological order to obtain the standard change interval combination corresponding to the detection parameter and the test status group.

6. A programmable DC power supply testing method for new energy charging piles according to claim 5, characterized in that, The process of obtaining the standard slope change curve includes: Map the standard change interval combinations corresponding to the same type of detection parameters and test status to the same multi-dimensional coordinate system, perform integral processing on the standard curve intervals in each standard change interval combination, and obtain the slope change curve corresponding to each standard curve segment interval; Set a density detection frame, traverse the slope change curves of each time interval along the direction perpendicular to the time coordinate axis through the density detection frame, select the part with the largest density of the slope change curve segment in each time interval according to the traversal result as the standard slope change curve segment corresponding to the time interval, and connect the standard slope change curve segments of each time interval in chronological order to obtain multiple standard slope change curves corresponding to the detection parameter type and test status combination.

7. A programmable DC power supply test method for new energy charging piles according to claim 6, characterized in that, The process of judging whether there is an abnormality in the current operating state of the to-be-tested charging pile includes: Obtain the load parameters of the vehicle or power grid connected to the to-be-tested charging pile, set a status monitoring period, and collect a number of real-time operating data of the power supply unit connected to the to-be-tested charging pile whenever a status monitoring period starts; Retrieve the standard slope change curve and the standard change interval combination corresponding to the same detection parameter according to the data types included in the load parameters, and judge the current load status of the corresponding power supply unit in real time according to the real-time voltage change curve and the real-time current change curve; Furthermore, screen the standard slope change curve and the standard change interval combination retrieved currently according to the current load status, compare the selected standard change interval combination with the real-time operating data, and judge whether there is a load abnormality in the to-be-tested charging pile in the corresponding status monitoring period according to the comparison result.

8. A programmable DC power supply testing method for new energy charging piles according to claim 7, characterized in that If it is judged that the to-be-tested charging pile has an abnormality in three consecutive status monitoring periods, or it is judged that a slope change curve is not within the corresponding standard change interval and a real-time operating data is not within the standard change interval at the same time in one status monitoring period, then directly judge that the to-be-tested charging pile cannot be used, otherwise do nothing.

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