A DC configurable power load testing method and device based on inverter technology

Abstract

The invention discloses a DC configurable power load test method and device based on inverter technology, belonging to the technical field of new energy technology, comprising: determining a loading power mode; setting power according to a module, and sending corresponding information to a power management module; the power management module enters a load mode, simulating a constant voltage or constant current load process of a battery pack on a charging pile; in the charging process, receiving information from a front-end interaction module in real time, and the power management module performs input and output power calibration through meter data; the inverter load module determines the load state according to the collected DC information output by the charging pile and performs corresponding processing; the DC configurable power load test method and device based on inverter technology utilize the power management module design to complete the design of an electric vehicle simulated battery load end, realize the adjustment process of the electric vehicle load charging power, improve the flexibility of the system from the hardware aspect, and make the output power detection of the vehicle charging pile more flexible.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy technologies, and in particular relates to a direct current configurable power load testing method and device based on an inverter technology. Background Art

[0002] The automobile BMS simulator is used to detect the charging function and security function of the automobile charging pile. The current automobile simulator mainly detects the function of the charging pile by using resistors as loads; however, the use of resistors has high energy consumption, low detection efficiency, and can only detect a single type of charging pile, which poses a great safety hazard. Therefore, a DC configurable power load test method and device based on inverter technology is developed to solve the existing problems. Summary of the invention

[0003] The purpose of the present invention is to provide a DC configurable power load testing method and device based on inverter technology to solve the problems of high energy consumption and low detection efficiency when detecting the function of a charging pile by using a resistor as a load.

[0004] To achieve the above object, the present invention provides the following technical solution: a DC configurable power load testing method based on inverter technology, comprising:

[0005] Set the loading power and load mode;

[0006] According to the loading power, adjust the output power and output mode to simulate the load test of the battery pack on the charging pile;

[0007] In load testing, the front-end interactive information is received in real time, and input and output power calibration is performed through meter data;

[0008] Collect the DC power parameters output by the charging pile to determine the load status and perform corresponding processing;

[0009] Wherein, the input and output power calibration includes:

[0010] The output power data is compared with the collected meter data to obtain the difference. If the difference is greater than the set value and the loaded power is greater than the power setting value, the output power is gradually reduced to the power setting value. If the loaded power is less than the power setting value, charging is interrupted.

[0011] Preferably, the set value is 1%.

[0012] Preferably, the power setting value is 20kw.

[0013] Preferably, the load test includes:

[0014] Constant voltage load test and constant current load test;

[0015] The constant voltage load test includes: detecting whether the voltage output accuracy of the charging pile is stable, and if the output voltage interval of the charging pile is between the voltage value -1% and the voltage value +1%, it is judged to be stable;

[0016] The constant current load test includes: detecting whether the current output accuracy of the charging pile is stable. If the output current range of the charging pile is from constant current value -1% to constant current value +1%, it is judged to be stable.

[0017] Preferably, the collecting of direct current parameters output by the charging pile to determine the load state and performing corresponding processing includes:

[0018] If the load state is in constant voltage mode, the module voltage is set to a fixed value, and the current reduction is configured according to the power size;

[0019] If the load state is constant current mode, the module current is set to the constant current value, and the voltage adjustment is configured according to the power size;

[0020] When the difference between the output current and voltage and the rated current and voltage set in the front-end interactive information exceeds the set value, it is judged as a fault and the charging test is interrupted.

[0021] Preferably, when a fault is determined, the output voltage and current are reduced, and when the output voltage is lower than 20V, the contactor is disconnected.

[0022] Preferably, the real-time reception of front-end interaction information includes: a charging permission flag of the UI, a current voltage, current, power or status flag, and meter data.

[0023] Preferably, the method further includes, after completing the load test of the charging pile, sending the test result to the front-end interaction module for display.

[0024] The present invention further provides a DC configurable power load device based on an inverter technology, comprising:

[0025] Battery modules;

[0026] Front-end interactive module, used for selecting functions and displaying data;

[0027] The central control module is used to control the simulator system, monitor the working status of components, configure and calibrate load parameters, and determine faults;

[0028] An information acquisition module, used to collect simulator circuit data;

[0029] Communication transmission module, used for data signals between the control module and all other devices;

[0030] Inverter module, used for load testing with BMS simulators of different charging standards;

[0031] Power management module;

[0032] The power management module includes: at least one power module and a power center control module.

[0033] Preferably, the front-end interaction module includes: configuration of module stack loading power, current simulator circuit data display, module stack working status and charging pile output power.

[0034] The technical effects and advantages of the present invention are as follows: the DC configurable power load testing method and device based on inverter technology utilizes the module stack design to complete the design of the electric vehicle simulated battery load end, realizes the electric vehicle load charging power adjustment process, and can realize the simulator charging scene and simulate the actual vehicle load adjustment without consuming electricity (only maintaining a small part of the consumption); improves the flexibility of the system from the hardware aspect, making the output power detection of the car charging pile more flexible, improving the application scope of the electric vehicle load, and meeting the charging test of various types of DC charging piles. The inverter is used instead of the traditional resistor to realize the electric vehicle load end, which improves the efficiency and performance of the simulator and can enable energy feedback, greatly reducing the use cost of the simulator and improving the safety during use; realizes multiple modes of simulator charging function and fault simulation function; can be used with BMS simulators of different charging standards to perform load testing, and through the power adjustment of the module stack, overload and other fault modes can be set. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a flow chart of the testing method of the present invention;

[0036] Figure 2 This is a framework diagram of the electrical system of the device of the present invention;

[0037] Figure 3 This is the control logic diagram of the device of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention provides Figure 1 A DC configurable power load test method based on inverter technology as shown in the figure includes the following steps:

[0040] Step 1: Determine the loading power mode of the power module through the front-end interaction module;

[0041] Step 2: The data is transmitted to the central control module through the communication transmission module. The central control module sends the corresponding information to the power management module according to the set power input by the front-end interaction module; the data includes charging mode: constant voltage or constant current mode, load power, charging permission status, peripheral communication status, etc.; the corresponding information includes output voltage and output current parameters;

[0042] Step 3: The power management module enters the load mode according to the information of the central control module, and adjusts the power and output mode of the power management module to simulate the constant voltage / constant current load process of the battery pack on the charging pile; in this embodiment, the power management module includes: 6 power modules and a power center control module;

[0043] Step 4: In the load process, the information of the front-end interaction module is received in real time, and the power management module calibrates the input and output power through the meter data. If the calibration fails, the current is gradually reduced. If the power management module detects that the charging pile has not interrupted charging, and detects that the input power still has a current greater than 5A or a voltage greater than 20V, it is determined that it is still in the charging process, and the load device needs to actively power off the power; the information received from the front-end interaction module includes: the charging permission flag of the UI, the current voltage / current / power / status flag fed back by the power management module, and the method of calibrating the meter data includes: comparing the data fed back by the power management module with the actual collected data of the meter, if the power difference is greater than 1%, it is considered that the difference is too large. Gradually reducing the current includes: if the difference is too large, the software process automatically controls the power to be reduced to 20kw, and if the loaded power is less than 20kw, it will not be reduced;

[0044] Step 5: The DC configurable power load device will collect the DC power parameters output by the charging pile through the information collection module, determine the load status according to the circuit information, and perform corresponding processing; the input voltage of the power management module is the output voltage of the charging pile, and the output voltage / current of the power management module is used to confirm whether the load is working normally. If the module has output power, it must be absorbed by the inverter. The inverter works, that is, the load status is started), and the load status is judged and the corresponding processing is performed, including: if the UI sets the charging mode to constant voltage mode, the module voltage is set to a fixed value, and the current reduction is configured according to the power size, which needs to be matched with the BMS simulator;

[0045] If the UI sets the charging mode to constant current mode, the module voltage is set to the constant current value. The voltage adjustment is configured according to the power size and needs to be matched with the BMS simulator. When the output current and voltage of the power management module differ greatly from the rated current and voltage set in the front-end interaction module, the inverter load module is judged to be faulty and the charging process should be interrupted. If the emergency stop button is pressed during the charging process, the load will stop charging immediately.

[0046] Step 6: After completing the load test of the charging pile, the central control module displays the test results on the front-end interactive module;

[0047] Selection of working mode in step 2: Configure the working mode through the UI interface. The load device based on inverter technology has two working modes: constant voltage mode and constant current mode. The constant voltage mode is used to test the constant voltage output function of the charging pile. The test method includes: In constant voltage mode, detect whether the voltage output accuracy of the charging pile is stable. If stable, it passes. If the constant voltage is 500V, the output voltage range of the charging pile is 500V±1%. Manual operation by the tester is required. The constant current mode is used to test the constant current state of the charging pile. The test can be implemented and the test results can be given. The test can be implemented and the test results can be given, including: In constant current mode, detect whether the current output accuracy of the charging pile is stable. If stable, it passes. If the constant current is 100A, the output voltage range of the charging pile is 500A±1%.

[0048] The testing process of the charging pile during the charging process in step 4 includes:

[0049] Step 4-1: In the charging state, the information acquisition module updates the data of the simulator circuit system in real time, performs loading operations according to the settings, and judges whether the output function of the charging pile is normal based on the circuit information; the circuit information includes: charging data (voltage / current / power), charging mode (constant voltage / constant current); judging whether the output function of the charging pile is normal includes: whether the current output power is consistent with the requested voltage / current (BMS simulator cooperation is required);

[0050] Step 4-2: Charging process If the central control module loses communication with the information acquisition module or other modules, it is determined that the DC configurable power load device based on the inverter technology is faulty, and the load mode is immediately stopped to interrupt charging; stopping the load mode includes: reducing the output voltage and current of the power management module. When the output voltage is lower than 20V, the contactor is disconnected.

[0051] The present invention further provides a DC configurable power load device based on inverter technology, comprising a front-end interaction module, a central control module, an information acquisition module, a communication transmission module and an inverter module;

[0052] The front-end interaction module is used to select functions and display data;

[0053] The central control module is used to control the operation of the simulator system; monitor the working status of the components in the system, configure and calibrate the load parameters, perform UI interaction, and perform fault determination;

[0054] The information acquisition module is used to collect simulator circuit data; calibrate voltage / current data to prevent safety hazards caused by abnormalities of charging piles and devices.

[0055] The communication transmission module is used for controlling data signals between the module and all other devices;

[0056] The front-end interaction module is implemented using a capacitive screen, which is used to configure the module stack loading power, display the current simulator circuit data, the module stack working status and the charging pile output power, etc.

[0057] The central control module uses a self-developed control module to process and respond to the information of each module to maintain the effective and stable operation of the entire simulator;

[0058] The information acquisition module is the circuit information in the simulator, and feeds the information back to the central control module for processing;

[0059] The communication transmission module uses CAN communication, RS485 and other communication methods to achieve data signal exchange between various modules.

[0060] The DC configurable power load test method and device based on inverter technology use the module stack design to complete the design of the electric vehicle simulated battery load end, realize the electric vehicle load charging power adjustment process, improve the system flexibility from the hardware aspect, make the output power detection of the car charging pile more flexible, improve the application range of the electric vehicle load, meet the charging test of various types of DC charging piles, use the inverter instead of the traditional resistor to realize the electric vehicle load end, improve the efficiency and performance of the simulator and enable energy feedback, greatly reduce the use cost of the simulator, and improve the safety during use; realize the simulator charging function and fault simulation function of multiple modes; can be used with BMS simulators of different charging standards for load testing, and through the power adjustment of the module stack, can set overload and other fault modes.

[0061] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A DC configurable power load test method based on inverter technology, characterized in that: include: Set the loading power and load mode; According to the loading power, adjust the output power and output mode of the charging pile to simulate the load test of the battery pack on the charging pile; In load testing, the front-end interactive information is received in real time, and input and output power calibration is performed through meter data; Collect the DC power parameters output by the charging pile to determine the load status and perform corresponding processing; Wherein, the input and output power calibration includes: The output power data of the charging pile is compared with the collected meter data to obtain the difference. If the difference is greater than the set value and the output power is greater than the power setting value, the output power is gradually reduced to the power setting value. If the output power is less than the power setting value, the charging is interrupted; the set value is 1%; the power setting value is 20kw; the load test includes: Constant voltage load test and constant current load test; The constant voltage load test includes: detecting whether the voltage output of the charging pile is stable, and if the output voltage interval of the charging pile is between the voltage value -1% and the voltage value +1%, it is judged to be stable; The constant current load test includes: detecting whether the current output of the charging pile is stable. If the output current range of the charging pile is from the constant current value -1% to the constant current value +1%, it is judged to be stable; the DC power parameters of the charging pile output are collected to determine the load state and perform corresponding processing, including: If the load state is in constant voltage mode, the module voltage is set to a fixed value, and the current reduction is configured according to the power size; If the load state is constant current mode, the module current is set to the constant current value, and the voltage adjustment is configured according to the power size; When the difference between the output current and voltage and the rated current and voltage set in the front-end interactive information exceeds the set value, it is judged as a fault and the charging test is interrupted.

2. The DC configurable power load testing method based on inverter technology according to claim 1 is characterized in that: The real-time reception of front-end interactive information includes: a charging permission flag of the UI, current voltage, current current, current power, a status flag, and electric meter data.

3. The DC configurable power load testing method based on inverter technology according to claim 1 is characterized in that: The method further includes, after completing the load test of the charging pile, sending the test result to the front-end interaction module for display.

4. A load device for implementing the DC configurable power load test method based on inverter technology as described in any one of claims 1 to 3, characterized in that: include: Battery modules; Front-end interactive module, used for selecting functions and displaying data; The central control module is used to control the simulator system, monitor the working status of components, configure and calibrate load parameters, and determine faults; An information acquisition module, used to collect simulator circuit data; Communication transmission module, used for data signals between the control module and all other devices; Inverter module, used for load testing with BMS simulators of different charging standards; Power management module; The power management module includes: at least one power module and a power center control module.

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