Test method for extreme working condition of energy self-balancing power module and related device

Abstract

The invention discloses an energy self-balancing power module extreme working condition test method and a related device, and the method comprises the steps: dividing a test into two scenes: a charging starting stage (small current) before unlocking, and a steady-state operation stage (large current) after unlocking, and carrying out the test of the energy self-balancing power module extreme working condition in the two scenes respectively. And respectively obtaining test data of two extreme working conditions. Therefore, the problem that no test is carried out on the energy self-balancing power module under the extreme working condition in the industry at present, that is, the energy self-balancing power module energy release branch welding type IGBT device is mistakenly switched on and overlaid to cause the module bypass switch refusal operation fault is solved; therefore, the reliability of the energy self-balancing power module after the energy self-balancing power module is put into operation in practical engineering cannot be judged.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible direct current (DC) converter valves, and in particular to a test method and related devices for extreme working conditions of an energy self-balancing power module. Background Art

[0002] The only structural difference between the energy-balancing power module in the flexible DC converter valve and the conventional topology power module is that a drain branch is connected in parallel to the positive and negative poles of the module capacitor. This drain branch is composed of a welded IGBT device, a drain resistor, and a connecting copper busbar in series. When a fault causes the module voltage to abnormally rise and exceed the set voltage of the drain branch during operation, the power module control board will promptly trigger IGBT T3 (half-bridge) or IGBT T5 (full-bridge) to open the drain branch and activate the drain resistor R2 (resistance of several ohms), thereby quickly discharging the module capacitor and reducing the module voltage to a safe operating range, ensuring that the power module is not damaged by overvoltage.

[0003] Although the energy self-balancing power module can achieve orderly regulation of the module voltage through the energy discharge branch to avoid overvoltage damage to the module, there is an extreme working condition, namely, "the welded IGBT device of the energy self-balancing power module energy discharge branch is mistakenly turned on and the module bypass switch refuses to operate at the same time"; the actual performance of the energy self-balancing module under the above extreme working condition is directly related to whether the energy self-balancing power module can operate reliably after being put into operation in actual engineering. However, the above test has not yet been carried out in the industry, and there is no mature test plan for reference. Therefore, it is urgent to design a test method for extreme working conditions of the energy self-balancing power module. Summary of the Invention

[0004] The present invention provides a test method for extreme operating conditions of an energy self-balancing power module, which is used to solve the problem that the reliability of the energy self-balancing power module after being put into operation in actual engineering cannot be judged because the industry has not yet conducted tests on the energy self-balancing power module under extreme operating conditions, namely, "the welded IGBT device of the energy discharge branch of the energy self-balancing power module is mistakenly turned on and the module bypass switch refuses to operate failure".

[0005] In view of this, a first aspect of the present application provides a test method for an energy self-balancing power module under extreme operating conditions, the method comprising:

[0006] Determining a stage at which an extreme operating condition occurs according to a current value of the energy self-balancing power module under test, wherein the stage includes: a start-up charging stage before unlocking and a steady-state operation stage after unlocking of the energy self-balancing power module under test;

[0007] Configuring test tools and test environments for testing in the pre-unlocking startup charging phase and the post-unlocking steady-state operation phase, respectively;

[0008] During the pre-unlocking charging phase, a first test circuit is constructed, the first test circuit is placed in the corresponding test environment, and a current equal to an actual charging current during the startup charging phase of the flexible direct current project is output to the tested energy self-balancing power module, a total duration of the first test is determined, the tested energy self-balancing power module is controlled to always be in a locked state, and first operating parameters and a first working state of each component in the energy discharge branch of the tested energy self-balancing power module are monitored in real time;

[0009] Based on the total duration of the first test, according to the first operating parameters and the first operating state, analyzing the test state of the tested energy self-balancing power module under extreme operating conditions, and recording the operating parameters at corresponding moments, to obtain extreme operating condition test data of the tested energy self-balancing power module during the startup charging phase before unlocking;

[0010] During the post-unlocking steady-state operation phase, a second test loop is constructed, the second test loop is placed in the corresponding test environment, and the operating current of the second test loop is controlled to be the same as the actual charging current during the unlocking operation phase of the flexible direct current project. The total duration of the second test is determined, the energy self-balancing power module under test is controlled to always be in a locked state, and the second operating parameters and second working state of each component in the energy discharge branch of the energy self-balancing power module under test are monitored in real time;

[0011] Based on the total duration of the second test, according to the operating parameters and the second working state, the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

[0012] Optionally, configuring a test tool and environment for testing the pre-unlocking startup charging phase and the post-unlocking steady-state operation phase, respectively, includes:

[0013] During the pre-unlock startup charging phase, a normal IGBT chip in the energy dissipation branch IGBT device of the energy self-balancing power module under test is replaced with a short-circuited and failed IGBT chip, and the chip is packaged into a complete welded IGBT device, and a water cooling system is configured to cool the energy self-balancing power module under test;

[0014] During the post-unlocking steady-state operation phase, the energy-draining branch welded IGBT of the energy-draining branch welded IGBT under test is a normal device, but the driving board of the energy-draining branch welded IGBT is continuously powered by an independent power supply, and is equipped with a communication channel for communicating with the test operation platform, and is configured with a water cooling system for cooling the energy-draining branch welded IGBT under test.

[0015] Optionally, constructing the first test loop includes:

[0016] The energy self-balancing power module under test is connected in parallel with a controlled current source Is, and the input power supply of the bypass switch driving board of the energy self-balancing module under test is disconnected.

[0017] Optionally, the real-time monitoring of the first operating parameters and the first working state of each component in the energy discharge branch of the tested energy self-balancing power module includes:

[0018] Real-time monitoring of the resistance R2 of the energy dissipation branch of the energy self-balancing power module under test, the module DC capacitor C1, and the voltage U at both ends of the module AC port R2 、U C1 、U SCR The surface temperature T of the energy dissipation branch resistor R2 of the energy self-balancing power module under test is monitored simultaneously. R2 , and observe whether the energy dissipation branch resistor R2 explodes.

[0019] Optionally, based on the total duration of the first test, according to the first operating parameters and the first working state, analyzing the test state of the tested energy self-balancing power module under extreme working conditions, and recording the operating parameters at corresponding moments, obtaining the extreme working condition test data of the tested energy self-balancing power module in the charging stage before unlocking, including:

[0020] During the first test duration, according to whether the energy dissipation branch resistor R2 explodes, and in combination with the energy dissipation branch resistor R2, the module DC capacitor C1, and the voltage U across the module AC port R2 、U C1 、U SCR The value of the energy dissipation branch resistor R2, the surface temperature T R2 , the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the charging stage before unlocking.

[0021] Optionally, constructing the second test loop includes:

[0022] The energy self-balancing power module under test is installed in the middle position of the test valve section of the valve section operation test platform, wherein the test valve section is composed of several modules connected in series, and the input power of the bypass switch driving board of the energy self-balancing module under test is disconnected.

[0023] Optionally, the real-time monitoring of the second operating parameters and the second working status of each component in the energy discharge branch of the tested energy self-balancing power module includes:

[0024] Real-time monitoring of the resistance R2 of the energy dissipation branch of the energy self-balancing power module under test, the module DC capacitor C1, and the voltage U at both ends of the module AC port R2 、U C1 、U SCR The surface temperature T of the energy dissipation branch resistor R2 of the energy self-balancing power module under test is monitored simultaneously. R2 , and observe whether the energy dissipation branch resistor R2 explodes.

[0025] Optionally, based on the total duration of the second test, according to the operating parameters and the second working state, the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at corresponding moments are recorded, to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking, including:

[0026] During the second test duration, according to whether the energy dissipation branch resistor R2 explodes, and in combination with the energy dissipation branch resistor R2, the module DC capacitor C1, and the voltage U across the module AC port R2 、U C1 、U SCR The value of the energy dissipation branch resistor R2, the surface temperature T R2 , analyze the test state of the tested energy self-balancing power module under extreme working conditions, and record the operating parameters at the corresponding time to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

[0027] Optionally, the energy self-balancing power module under test is: an energy self-balancing half-bridge power module or an energy self-balancing full-bridge power module.

[0028] A second aspect of the present application provides a method for testing an energy self-balancing power module under extreme operating conditions, the device comprising:

[0029] A judgment unit, configured to determine a stage in which an extreme operating condition occurs according to a current value of the energy self-balancing power module under test, wherein the stage includes: a start-up charging stage before unlocking and a steady-state operation stage after unlocking of the energy self-balancing power module under test;

[0030] a configuration unit, configured to configure test tools and a test environment for conducting tests in the pre-unlocking startup charging phase and the post-unlocking steady-state operation phase, respectively;

[0031] a first control unit, configured to initiate a charging phase before unlocking, construct a first test loop, place the first test loop in the corresponding test environment, output a current to the tested energy self-balancing power module that is the same as an actual charging current during the startup charging phase of the flexible direct current project, determine a total duration of the first test, control the tested energy self-balancing power module to always be in a locked state, and monitor in real time a first operating parameter and a first working state of each component in an energy discharge branch of the tested energy self-balancing power module;

[0032] a first analyzing unit, configured to analyze, based on the total duration of the first test, the first operating parameter, and the first operating state, the test state of the tested energy self-balancing power module under extreme operating conditions, and simultaneously record the operating parameters at corresponding moments, to obtain extreme operating condition test data of the tested energy self-balancing power module during the charging phase before unlocking;

[0033] a second control unit, configured to construct a second test loop during the post-unlocking steady-state operation phase, place the second test loop in the corresponding test environment, control the operating current of the second test loop to be the same as the actual charging current during the unlocking operation phase of the flexible direct current project, determine the total duration of the second test, control the tested energy self-balancing power module to always be in a locked state, and monitor in real time the second operating parameters and second working state of each component in the energy discharge branch of the tested energy self-balancing power module;

[0034] The second analysis unit is used to analyze the test state of the tested energy self-balancing power module under extreme working conditions based on the total duration of the second test, the operating parameters and the second working state, and record the operating parameters at the corresponding time to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

[0035] A third aspect of the present invention provides a test device for an energy self-balancing power module under extreme operating conditions, the device comprising a processor and a memory:

[0036] The memory is used to store program code and transmit the program code to the processor;

[0037] The processor is configured to execute the steps of the test method for the extreme working conditions of the energy self-balancing power module as described in the first aspect according to the instructions in the program code.

[0038] A fourth aspect of the present invention provides a computer-readable storage medium for storing program code, wherein the program code is used to execute the test method for extreme operating conditions of the energy self-balancing power module described in the first aspect.

[0039] It can be seen from the above technical solutions that the present invention has the following advantages:

[0040] The present invention provides a testing method for extreme operating conditions of energy-balancing power modules. The method divides the test into two scenarios: the "startup charging phase before unlocking (low current)" and the "steady-state operation phase after unlocking (high current)." The method conducts extreme operating condition tests of the energy-balancing power module in each scenario, generating two types of extreme operating condition test data. This method solves the problem of being unable to determine the reliability of energy-balancing power modules after commissioning in actual projects, as the industry has not yet conducted testing of energy-balancing power modules under extreme operating conditions, namely, "the misoperation of welded IGBT devices in the energy-discharging branch of the energy-balancing power module, combined with the failure of the module's bypass switch to operate." BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 A flow chart of a test method for an energy self-balancing power module under extreme operating conditions provided by an embodiment of the present invention;

[0043] Figure 2 A schematic diagram of the topological structure of an energy self-balancing half-bridge power module provided by an embodiment of the present invention;

[0044] Figure 3 A schematic diagram of the topological structure of an energy self-balancing full-bridge power module provided in an embodiment of the present invention;

[0045] Figure 4 A schematic structural diagram of a test system for extreme working conditions of an energy self-balancing power module provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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 making creative work are within the scope of protection of the present invention.

[0047] The experimental principle of the present invention is analyzed and explained as follows:

[0048] The energy self-balancing power module of the flexible DC converter valve includes an energy self-balancing half-bridge power module and an energy self-balancing full-bridge power module. The topological structure diagrams are as follows: Figure 2 、 Figure 3 As shown in the figure, the main components inside the energy self-balancing half-bridge and full-bridge power modules include: press-fit IGBTs, fast recovery diodes, DC capacitors, grading resistors, bypass switches, energy dissipation branch welded IGBT devices, energy dissipation resistors, energy power supply, redundant power supply, module control board, welded IGBT driver board and bypass switch driver board, etc.

[0049] Depend on Figure 2 、 3 It can be seen that the only structural difference between the energy self-balancing half-bridge power module and the energy self-balancing full-bridge power module and the conventional topology power module is that a drain branch is connected in parallel to the positive and negative poles of the module capacitor. The drain branch is composed of a welded IGBT device, a drain resistor, and a connecting copper bus in series. When a fault causes the module voltage to abnormally rise and exceed the set voltage of the drain branch during operation, the power module control board will promptly trigger IGBT T3 (half-bridge) or IGBT T5 (full-bridge) to open the drain branch and turn on the drain resistor R2 (resistance of several ohms), thereby quickly discharging the module capacitor and reducing the module voltage to a safe operating range, ensuring that the power module is not damaged by overvoltage.

[0050] Although the energy self-balancing half-bridge and full-bridge power modules can achieve orderly regulation of module voltage through the energy dissipation branch to avoid overvoltage damage to the module, there is an extreme working condition, namely "the energy self-balancing power module energy dissipation branch welded IGBT device is mistakenly turned on and the module bypass switch refuses to operate at the same time". Under this working condition, the module is locked and the energy dissipation branch is out of control. The surplus energy in the system will continue to be absorbed by the energy dissipation branch resistor of the energy self-balancing module, but the module energy dissipation resistor has a limit energy tolerance value. Once this value is exceeded, the energy dissipation resistor is at risk of bursting. At the same time, the welding IGBT inside the energy dissipation branch also has an energy tolerance upper limit. Once the limit is exceeded, the bonding wire will melt, thereby disconnecting the energy dissipation branch and the energy dissipation resistor will The device is cut off and stops absorbing energy. Therefore, under the above extreme operating conditions, if the internal bond wires of the welded IGBT reach the energy tolerance limit before the energy dump resistor, the energy dump resistor will not be at risk of bursting due to exceeding the energy tolerance limit. It is necessary to observe whether the subsequent module voltage can continue to rise, causing the module bypass thyristor to break down and fail, and then whether the module can be reliably bypassed. However, if the internal bond wires of the welded IGBT reach the energy tolerance limit later than the energy dump resistor, the energy dump resistor is at risk of bursting due to exceeding the energy tolerance limit. In this case, if the module energy dump resistor does burst, it is necessary to observe whether the module's explosion-proof design meets the requirements and whether the subsequent module voltage can continue to rise, causing the module bypass thyristor to break down and fail, and then whether the module can be reliably bypassed. The actual performance of the energy self-balancing module under the above extreme operating conditions is directly related to whether the energy self-balancing power module can operate reliably after being put into operation in actual projects.

[0051] Furthermore, the inventors obtained through experimental observations:

[0052] The extreme operating condition of "the welded IGBT device in the energy dissipation branch of the energy self-balancing power module is mistakenly turned on and the module bypass switch refuses to operate" may occur during the startup charging stage before unlocking the power module (at this time, the current flowing through the power module is small, about tens of amperes), or it may occur during the steady-state operation stage after unlocking (at this time, the current flowing through the power module is large, about several thousand amperes).

[0053] Therefore, the test should be divided into two scenarios: "start-up charging stage (low current)" and "unlocking operation stage (high current)". In each scenario, the test method of energy self-balancing half-bridge power module and energy self-balancing full-bridge power module is the same, only the test objects are different. The specific test process is as follows:

[0054] Example 1:

[0055] See also Figure 1-3 , an embodiment of the present invention provides a test method for an energy self-balancing power module under extreme operating conditions, comprising:

[0056] Step 101: Determine the stage where the extreme operating condition occurs according to the current value of the tested energy self-balancing power module, where the stages include: a start-up charging stage before unlocking and a steady-state operation stage after unlocking of the tested energy self-balancing power module.

[0057] Step 102 : configuring test tools and test environments for testing in the pre-unlocking startup charging phase and the post-unlocking steady-state operation phase, respectively.

[0058] In some embodiments, step 102 includes:

[0059] For the startup charging stage before unlocking, a short-circuited and failed IGBT chip is used to replace a normal IGBT chip in the energy dissipation branch IGBT device of the tested energy self-balancing power module, and the chip is packaged into a complete welded IGBT device. A water cooling system is also configured to cool the tested energy self-balancing power module.

[0060] During the steady-state operation phase after unlocking, the energy-draining branch welded IGBT of the energy-draining branch welded IGBT under test is a normal device, but the driver board of the energy-draining branch welded IGBT is continuously powered by an independent power supply, and is equipped with a communication channel for communicating with the test operation platform, and is configured with a water cooling system for cooling the energy-draining branch welded IGBT under test.

[0061] Step 103: Before unlocking, start the charging phase, construct a first test circuit, place the first test circuit in a corresponding test environment, and output a current to the energy self-balancing power module under test that is the same as the actual charging current during the startup charging phase of the flexible DC project. Determine the total duration of the first test, control the energy self-balancing power module under test to always be in a locked state, and monitor the first operating parameters and the first working state of each component in the energy discharge branch of the energy self-balancing power module under test in real time.

[0062] In some embodiments, constructing a first test loop in step 102 includes:

[0063] The energy self-balancing power module under test is connected in parallel with a controlled current source Is, and the input power supply of the bypass switch driving board of the energy self-balancing module under test is disconnected.

[0064] In some embodiments, in step 102, real-time monitoring of first operating parameters and first working states of components in the energy dissipation branch of the energy self-balancing power module under test includes:

[0065] Real-time monitoring of the resistance R2 of the energy dissipation branch of the tested energy self-balancing power module, the module DC capacitor C1, and the voltage U at both ends of the module AC port R2 、U C1 、U SCRThe surface temperature T of the energy dissipation branch resistor R2 of the energy self-balancing power module under test is monitored simultaneously. R2 , and observe whether the energy dissipation branch resistor R2 bursts.

[0066] Step 104: Based on the total duration of the first test, according to the first operating parameters and the first working state, the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the charging stage before unlocking.

[0067] In some embodiments, step 104 includes:

[0068] During the first test duration, based on whether the energy dissipation branch resistor R2 explodes, combined with the energy dissipation branch resistor R2, the module DC capacitor C1, and the voltage U across the module AC port R2 、U C1 、U SCR The value of the energy dissipation branch resistor R2, the surface temperature T R2 , the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the startup charging stage before unlocking.

[0069] It should be noted that, in the charging phase before unlocking, the test state of the energy self-balancing power module under extreme working conditions is analyzed, as shown in steps A4 to A6 of Example 2 for details.

[0070] Step 105: In the steady-state operation phase after unlocking, construct a second test circuit, place the second test circuit in a corresponding test environment, and control the operating current of the second test circuit to be the same as the actual charging current of the flexible DC project in the unlocking operation phase. Determine the total duration of the second test, control the energy self-balancing power module under test to always be in a locked state, and monitor the second operating parameters and second working state of each component in the energy discharge branch of the energy self-balancing power module under test in real time.

[0071] In some embodiments, constructing the second test loop in step 105 includes:

[0072] The energy self-balancing power module to be tested is installed in the middle position of the test valve section of the valve section operation test platform, where the test valve section is composed of several modules connected in series, and the input power of the bypass switch driver board of the energy self-balancing module to be tested is disconnected.

[0073] In some embodiments, in step 105, real-time monitoring of the second operating parameters and the second working status of each component in the energy dissipation branch of the energy self-balancing power module under test includes:

[0074] Real-time monitoring of the resistance R2 of the energy dissipation branch of the tested energy self-balancing power module, the module DC capacitor C1, and the voltage U at both ends of the module AC port R2 、U C1 、U SCR The surface temperature T of the energy dissipation branch resistor R2 of the energy self-balancing power module under test is monitored simultaneously. R2 , and observe whether the energy dissipation branch resistor R2 bursts.

[0075] Step 106: Based on the total duration of the second test, according to the operating parameters and the second working state, the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

[0076] In some embodiments, step 106 includes:

[0077] During the second test duration, based on whether the energy dissipation branch resistor R2 explodes, combined with the energy dissipation branch resistor R2, the module DC capacitor C1, and the voltage U across the module AC port R2 、U C1 、U SCR The value of the energy dissipation branch resistor R2, the surface temperature T R2 , the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

[0078] It should be noted that, in the steady-state operation stage after unlocking, the test state of the energy self-balancing power module under extreme working conditions is analyzed, as shown in steps B4 to B6 of Example 3.

[0079] Example 2:

[0080] Unlocking startup charging stage (low current) extreme working condition test method:

[0081] The test object is no less than one complete energy self-balancing half-bridge power module or one complete energy self-balancing full-bridge power module. The water cooling system needs to be turned on when testing the energy self-balancing power module under test. The energy dissipation branch welded IGBT (T3 for half-bridge and T5 for full-bridge) of the energy self-balancing power module under test adopts a special test device (the IGBT device manufacturer replaces a normal IGBT chip in the IGBT device with a short-circuited and failed IGBT chip, and then encapsulates it into a complete welded IGBT device. The device should be electrically short-circuited but the internal bonding wire connections should be intact and not damaged, so as to simulate the device being mistakenly turned on).

[0082] Step A1: Connect the energy self-balancing power module under test in parallel with a controlled current source Is, disconnect the input power supply of the bypass switch driver board of the energy self-balancing module under test (to simulate the module bypass switch failure), and place the entire test circuit in a closed test space with explosion-proof capability;

[0083] Step A2: First, turn on the water cooling system. After the cooling water inlet temperature of the energy self-balancing power module under test stabilizes (temperature fluctuation does not exceed 2°C), adjust the controlled current source Is connected in parallel with the energy self-balancing power module under test so that its output current I 充电 The actual charging current I charge consistent;

[0084] Step A3: The total test duration is set to Tset. During the test, the energy self-balancing power module under test is always in a locked state. The test is carried out continuously. During the test, the voltage U across the energy self-balancing power module's energy dissipation branch resistor R2, the module's DC capacitor C1, and the module's AC port (that is, across the module's bypass thyristor SCR) is monitored and recorded in real time. R2 、U C1 、U SCR The surface temperature T of the energy dissipation branch resistor R2 of the energy self-balancing power module under test is monitored simultaneously. R2 And observe whether the energy dissipation branch resistor R2 explodes;

[0085] Step A4: If the energy dissipation branch resistor R2 is observed to have exploded within the set total test time Tset and the voltage U across the module energy dissipation branch resistor is R2 The voltage U across the module DC capacitor C1 C1 The values ​​are always equal, indicating that the bonding wires inside the energy dissipation branch welded IGBT device have not exceeded their tolerance energy limit before the energy dissipation branch resistor bursts. At this time, the instantaneous voltage U at which the energy dissipation branch resistor bursts is recorded. R2 、U C1 、U SCR , temperature T R2 Then continue with steps A4.1 to A4.2.

[0086] Step A4.1: Continue to monitor the voltage U across the module energy dissipation branch resistor R2, the module DC capacitor C1, and the module AC port (that is, across the module bypass thyristor SCR) after the energy dissipation branch resistor R2 explodes. R2 、U C1 、U SCRAfter the energy dissipation resistor R2 explodes, it is generally in an open circuit state electrically. At this time, the energy dissipation branch is cut off, and the module capacitor C1 cannot continue to discharge quickly through the energy dissipation branch. At this time, the voltage of the module DC capacitor C1 will continue to rise until it breaks down the module bypass thyristor SCR. Record the voltage value U at the moment of bypass thyristor SCR breakdown SCR击穿 , monitor the voltage U across the module energy dissipation branch resistor during this process R2 The voltage U across the module DC capacitor C1 C1 The values ​​should always remain equal;

[0087] Step A4.2: Adjust the output current of the controlled current source Is to 0, and wait for the voltage U C1 After the voltage drops to 0, enter the closed test space, conduct on-site inspection and record whether there are any solid particles from the internal components of the module flying out around the tested energy self-balancing power module. Then remove the module cover to check and record the status of the energy dissipation resistor after the explosion and whether the explosion of the resistor has caused damage to other components of the module (such as cooling water pipes, etc.). Simultaneously record the status of the module bypass thyristor after the breakdown and whether the breakdown of the thyristor has caused damage to other components of the module (such as cooling water pipes, etc.). Measure and record the impedance value Z at both ends of the module after the breakdown of the bypass thyristor. 击穿 , the experiment ends.

[0088] Step A5: If the energy dissipation branch resistor R2 is not observed to burst within the set total test time Tset, but the voltage U across the module energy dissipation branch resistor is monitored at the same time, R2 The value is always equal to U C1 The voltage suddenly changes to close to 0V and remains at 0V. This indicates that the bonding wire inside the IGBT device in the energy dissipation branch has exceeded its tolerance energy limit and melted before the energy dissipation resistor explodes. At this time, the voltage U is recorded when the voltage across the energy dissipation resistor suddenly changes to 0. R2 、U C1 、U SCR , temperature T R2 Then continue with steps A5.1 to A5.2.

[0089] Step A5.1: Continue to monitor the voltage U across the module energy dissipation branch resistor R2, the module DC capacitor C1, and the module AC port (i.e., across the module bypass thyristor SCR) after the voltage across the energy dissipation branch resistor suddenly changes to close to 0V. R2 、U C1 、U SCRThe voltage across the energy-discharging resistor suddenly changes to close to 0V, which means that the bonding wire inside the energy-discharging branch welded IGBT device has melted, causing the energy-discharging branch welded IGBT device to electrically switch from a short-circuit state to an open-circuit state. At this time, the energy-discharging branch is cut off, and the module capacitor C1 cannot continue to discharge quickly through the energy-discharging branch. At this time, the voltage of the module DC capacitor C1 will continue to rise until it breaks down the module bypass thyristor SCR. Record the voltage value U at the moment of bypass thyristor SCR breakdown. SCR击穿 , monitor the voltage U across the module energy dissipation branch resistor during this process R2 It should always be 0V;

[0090] Step A5.2: Adjust the output current of the controlled current source Is to 0, and wait for the voltage U C1 After the voltage drops to 0, enter the closed test space, conduct on-site inspection and record whether there are any solid particles splashing out of the internal components of the module around the tested energy self-balancing power module, then remove the module cover to check and record the status of the energy dissipation resistor, and simultaneously record the status of the module bypass thyristor after breakdown and whether the thyristor breakdown has caused damage to other components of the module (such as cooling water pipes, etc.), and measure and record the impedance value Z at both ends of the module after the bypass thyristor breakdown 击穿 , the experiment ends.

[0091] Step A6: If the energy dissipation branch resistor R2 is not observed to burst and the voltage U across the module energy dissipation branch resistor is not monitored within the set total test time Tset, R2 The value is always equal to U C1 The voltage suddenly changes to close to 0V and remains at 0V, but the surface temperature T R2 Never exceeds its tolerance upper limit T max , it means that the energy discharge branch will remain in the connected state during the startup and charging phase of the project, the energy discharge resistor R2 will not burst, the entire module will enter a dynamically stable state, and the test is completed.

[0092] Example 3:

[0093] Unlocking the extreme operating conditions test method during the operation phase (high current):

[0094] The test object is no less than one complete energy self-balancing half-bridge power module or one complete energy self-balancing full-bridge power module. The water cooling system needs to be turned on when the energy self-balancing power module is tested. The energy dissipation branch welded IGBT (T3 for half bridge and T5 for full bridge) of the energy self-balancing power module to be tested adopts normal devices supplied by the project (electrically characterized as an open circuit state when not triggered and electrically characterized as a short circuit state when triggered). However, the energy dissipation branch welded IGBT driver board of the energy self-balancing power module to be tested adopts an independent power supply independent of the module for continuous power supply (not affected by the voltage change of the module). At the same time, the driver board is connected to the operation interface of the valve section operation test platform through an additional pair of communication optical fibers.

[0095] Step B1: Install the energy self-balancing power module under test in the middle of the test valve section (a valve section consists of multiple modules connected in series) of the valve section operation test platform. Disconnect the input power supply of the bypass switch driver board of the energy self-balancing module under test (to simulate the module bypass switch refusing to operate). Place the entire test circuit in a closed test space with explosion-proof capabilities.

[0096] Step B2: First, turn on the water cooling system, start the valve section to run the test platform, set the test parameters through the platform operation interface, and make the platform operating current I flowing through the test module 运行 Unlocking the actual operating current I during the operation phase with the flexible DC project arm Consistent, wait until the voltage of the tested power module is stable at the rated voltage U 额定 After the nearby power-on / power-off is normal and the cooling water inlet temperature of the tested energy self-balancing power module is stable (temperature fluctuation does not exceed 2°C);

[0097] Step B3: The total test duration is set to Tset. During the test, the "on" command is continuously issued to the energy dissipation branch welding IGBT driver board of the energy self-balancing power module under test through the test platform operation interface. The energy dissipation branch welding IGBT will always be in the on state (in order to simulate the device being mistakenly turned on). After receiving the above command, the energy self-balancing power module under test will immediately enter the locked state. The test is carried out continuously. During the test, the voltage U across the energy dissipation branch resistance R2, the module DC capacitor C1, and the module AC port (that is, across the module bypass thyristor SCR) of the energy self-balancing power module under test is monitored and recorded in real time. R2 、U C1 、U SCR The surface temperature T of the energy dissipation branch resistor R2 of the energy self-balancing power module under test is monitored simultaneously. R2 And observe whether the energy dissipation branch resistor R2 explodes;

[0098] Step B4: If the energy dissipation branch resistor R2 is observed to have exploded within the set total test time Tset and the voltage U across the module energy dissipation branch resistor isR2 The voltage U across the module DC capacitor C1 C1 The values ​​are always equal, indicating that the bonding wires inside the energy dissipation branch welded IGBT device have not exceeded their tolerance energy limit before the energy dissipation branch resistor bursts. At this time, the instantaneous voltage U at which the energy dissipation branch resistor bursts is recorded. R2 、U C1 、U SCR , temperature T R2 Then continue with steps B4.1 to B4.2.

[0099] Step B4.1: Continue to monitor the voltage U across the module energy dissipation branch resistor R2, the module DC capacitor C1, and the module AC port (that is, across the module bypass thyristor SCR) after the energy dissipation branch resistor R2 explodes. R2 、U C1 、U SCR After the energy dissipation resistor R2 explodes, it is generally in an open circuit state electrically. At this time, the energy dissipation branch is cut off, and the module capacitor C1 cannot continue to discharge quickly through the energy dissipation branch. At this time, the voltage of the module DC capacitor C1 will rise rapidly until it breaks down the module bypass thyristor SCR. Record the voltage value U at the moment of bypass thyristor SCR breakdown SCR击穿 , monitor the voltage U across the module energy dissipation branch resistor during this process R2 The voltage U across the module DC capacitor C1 C1 The values ​​should always remain equal;

[0100] Step B4.2: Adjust the output current of the valve section operation test platform to 0, and wait for the voltage U C1 After the voltage drops to 0, enter the closed test space, conduct on-site inspection and record whether there are any solid particles from the internal components of the module flying out around the tested energy self-balancing power module. Then remove the module cover to check and record the status of the energy dissipation resistor after the explosion and whether the explosion of the resistor has caused damage to other components of the module (such as cooling water pipes, etc.). Simultaneously record the status of the module bypass thyristor after the breakdown and whether the breakdown of the thyristor has caused damage to other components of the module (such as cooling water pipes, etc.). Measure and record the impedance value Z at both ends of the module after the breakdown of the bypass thyristor. 击穿 , the experiment ends.

[0101] Step B5: If the energy dissipation branch resistor R2 is not observed to burst within the set total test time Tset, but the voltage U across the module energy dissipation branch resistor is monitored at the same time, R2 The value is always equal to U C1The voltage suddenly changes to close to 0V and remains at 0V. This indicates that the bonding wire inside the IGBT device in the energy dissipation branch has exceeded its tolerance energy limit and melted before the energy dissipation resistor explodes. At this time, the voltage U is recorded when the voltage across the energy dissipation resistor suddenly changes to 0. R2 、U C1 、U SCR , temperature T R2 Then continue with steps B5.1 to B5.2.

[0102] Step B5.1: Continue to monitor the voltage across the energy dissipation branch resistor R2, the module DC capacitor C1, and the module AC port (i.e., the module bypass thyristor SCR) after the voltage across the energy dissipation branch resistor suddenly changes to close to 0V. R2 、U C1 、U SCR The voltage across the energy-discharging resistor suddenly changes to close to 0V, which means that the bonding wire inside the energy-discharging branch welded IGBT device has melted, causing the energy-discharging branch welded IGBT device to electrically switch from a short-circuit state to an open-circuit state. At this time, the energy-discharging branch is cut off, and the module capacitor C1 cannot continue to discharge quickly through the energy-discharging branch. At this time, the voltage of the module DC capacitor C1 will rise rapidly until it breaks down the module bypass thyristor SCR. Record the voltage value U at the moment of bypass thyristor SCR breakdown. SCR击穿 , monitor the voltage U across the module energy dissipation branch resistor during this process R2 It should always be 0V;

[0103] Step B5.2: Adjust the output current of the valve section operation test platform to 0, and wait for the voltage U C1 After the voltage drops to 0, enter the closed test space, conduct on-site inspection and record whether there are any solid particles splashing out of the internal components of the module around the tested energy self-balancing power module, then remove the module cover to check and record the status of the energy dissipation resistor, and simultaneously record the status of the module bypass thyristor after breakdown and whether the thyristor breakdown has caused damage to other components of the module (such as cooling water pipes, etc.), and measure and record the impedance value Z at both ends of the module after the bypass thyristor breakdown 击穿 , the experiment ends.

[0104] Step B6: If the energy dissipation branch resistor R2 is not observed to burst and the voltage U across the module energy dissipation branch resistor is not monitored within the set total test time Tset, R2 The value is always equal to U C1 The voltage suddenly changes to close to 0V and remains at 0V, but the surface temperature T R2 Never exceeds its tolerance upper limit T max, it means that the energy-discharging branch will remain in the on-state during the unlocking operation phase of the project, the energy-discharging resistor R2 will not burst, the entire module will enter a dynamically stable state, and the test is completed.

[0105] An embodiment of the present invention provides a method for testing an energy-balancing power module under extreme operating conditions. This method divides the test into two scenarios: the "startup charging phase before unlocking (low current)" and the "steady-state operation phase after unlocking (high current)." The method then conducts extreme operating condition tests on the energy-balancing power module in each scenario, generating two types of extreme operating condition test data. This method addresses the issue of being unable to determine the reliability of energy-balancing power modules after commissioning in actual projects, as the industry has not yet conducted testing on energy-balancing power modules under extreme operating conditions, namely, the "mistaken activation of welded IGBT devices in the energy-discharging branch of the energy-balancing power module, combined with a module bypass switch failure."

[0106] The above is a test method for an energy self-balancing power module under extreme working conditions provided in an embodiment of the present invention. The following is a test system for an energy self-balancing power module under extreme working conditions provided in an embodiment of the present invention.

[0107] See also Figure 4 , an embodiment of the present invention provides a test system for extreme working conditions of an energy self-balancing power module, comprising:

[0108] The judgment unit 201 is used to determine the stage of the extreme working condition according to the current value of the tested energy self-balancing power module, and the stages include: the start-up charging stage before unlocking and the steady-state operation stage after unlocking of the tested energy self-balancing power module.

[0109] The configuration unit 202 is used to configure the test tools and test environment for performing tests in the start-up charging phase before unlocking and the steady-state operation phase after unlocking.

[0110] The first control unit 203 is used to start the charging phase before unlocking, construct a first test circuit, place the first test circuit in a corresponding test environment, and output a current to the tested energy self-balancing power module that is the same as the actual charging current during the startup charging phase of the flexible direct current project, determine the total duration of the first test, control the tested energy self-balancing power module to always be in a locked state, and monitor in real time the first operating parameters and first working state of each component in the energy discharge branch of the tested energy self-balancing power module.

[0111] The first analysis unit 204 is used to analyze the test state of the tested energy self-balancing power module under extreme working conditions based on the total duration of the first test, according to the first operating parameters and the first working state, and record the operating parameters at the corresponding time to obtain the extreme working condition test data of the tested energy self-balancing power module in the charging stage before unlocking.

[0112] The second control unit 205 is used to construct a second test circuit in the steady-state operation stage after unlocking, place the second test circuit in the corresponding test environment, and control the operating current of the second test circuit to be the same as the actual charging current in the unlocking operation stage of the flexible direct current project, determine the total duration of the second test, control the tested energy self-balancing power module to always be in a locked state, and monitor the second operating parameters and second working state of each component in the energy discharge branch of the tested energy self-balancing power module in real time.

[0113] The second analysis unit 206 is used to analyze the test state of the tested energy self-balancing power module under extreme working conditions based on the total duration of the second test, the operating parameters and the second working state, and record the operating parameters at the corresponding time to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

[0114] Furthermore, an embodiment of the present invention also provides a test device for extreme working conditions of an energy self-balancing power module, the device including a processor and a memory:

[0115] The memory is used to store program code and transmit the program code to the processor;

[0116] The processor is configured to execute the steps of the test method for the extreme working condition of the energy self-balancing power module as described in the above method embodiment according to the instructions in the program code.

[0117] Furthermore, an embodiment of the present invention also provides a computer-readable storage medium for storing program code, and the program code is used to execute the test method for extreme working conditions of the energy self-balancing power module described in the above method embodiment.

[0118] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0119] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0120] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0121] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0122] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0123] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A test method for extreme working conditions of an energy self-balancing power module, characterized in that: include: Determine the stage where the extreme working condition occurs according to the current value of the energy self-balancing power module under test, wherein the stage includes: a start-up charging stage before unlocking and a steady-state operation stage after unlocking of the energy self-balancing power module under test; respectively configuring test tools and test environments for testing in the pre-unlocking startup charging phase and the post-unlocking steady-state operation phase; In the charging phase started before unlocking, a first test loop is constructed, the first test loop is placed in the corresponding test environment, and a current equal to the actual charging current in the charging phase of the flexible direct current project is output to the energy self-balancing power module under test, the total duration of the first test is determined, the energy self-balancing power module under test is controlled to be always in a locked state, and the first operating parameters and the first working state of each component in the energy discharge branch of the energy self-balancing power module under test are monitored in real time; Based on the total duration of the first test, according to the first operating parameters and the first working state, the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the charging stage before unlocking; In the post-unlocking steady-state operation stage, a second test loop is constructed, the second test loop is placed in the corresponding test environment, and the operating current of the second test loop is controlled to be the same as the actual charging current in the unlocking operation stage of the flexible direct current project, the total duration of the second test is determined, the energy self-balancing power module under test is controlled to be always in a locked state, and the second operating parameters and the second working state of each component in the energy discharge branch of the energy self-balancing power module under test are monitored in real time; Based on the total duration of the second test, according to the operating parameters and the second working state, the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

2. The test method for extreme working conditions of energy self-balancing power module according to claim 1 is characterized in that: The test tools and environment for testing the pre-unlocking startup charging phase and the post-unlocking steady-state operation phase are configured, including: For the pre-unlocking startup charging stage, a short-circuited and failed IGBT chip is used to replace a normal IGBT chip in the energy dissipation branch IGBT device of the energy self-balancing power module under test, and is packaged into a complete welded IGBT device, and a water cooling system for cooling the energy self-balancing power module under test is configured; For the post-unlocking steady-state operation stage, the energy dissipation branch welded IGBT of the energy self-balancing power module under test is a normal device, but the driving board of the energy dissipation branch welded IGBT is continuously powered by an independent power supply, and is equipped with a communication channel for communicating with the test operation platform, and is configured with a water cooling system for cooling the energy self-balancing power module under test.

3. The test method for extreme working conditions of energy self-balancing power module according to claim 1 is characterized in that: The construction of the first test loop comprises: The energy self-balancing power module under test is connected in parallel with a controlled current source Is, and the input power supply of the bypass switch driving board of the energy self-balancing module under test is disconnected.

4. The test method for extreme working conditions of energy self-balancing power module according to claim 1 is characterized in that: The real-time monitoring of the first operating parameters and the first working state of each component in the energy dissipation branch of the energy self-balancing power module under test includes: Real-time monitoring of the resistance R2 of the energy dissipation branch of the energy self-balancing power module under test, the module DC capacitor C1, and the voltage U at both ends of the module AC port R2 , U C1 , U SCR The surface temperature T of the energy dissipation branch resistor R2 of the energy self-balancing power module under test is monitored synchronously. R2 , and observe whether the energy dissipation branch resistor R2 explodes.

5. The test method for extreme working conditions of energy self-balancing power module according to claim 4 is characterized in that: Based on the total duration of the first test, according to the first operating parameters and the first working state, the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded, so as to obtain the extreme working condition test data of the tested energy self-balancing power module in the charging stage before unlocking, including: During the first test duration, according to whether the energy dissipation branch resistor R2 is broken, and in combination with the energy dissipation branch resistor R2, the module DC capacitor C1, and the voltage U at both ends of the module AC port R2 , U C1 , U SCR The value of the surface temperature T of the energy dissipation branch resistor R2 R2 , the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the charging stage before unlocking.

6. The test method for extreme working conditions of energy self-balancing power module according to claim 1, characterized in that: The second test loop is constructed, comprising: The energy self-balancing power module under test is installed in the middle position of the test valve section of the valve section operation test platform, wherein the test valve section is composed of several modules connected in series, and the input power of the bypass switch driving board of the energy self-balancing module under test is disconnected.

7. The test method for extreme working conditions of energy self-balancing power module according to claim 1, characterized in that: The real-time monitoring of the second operating parameters and the second working state of each component in the energy dissipation branch of the energy self-balancing power module under test includes: Real-time monitoring of the resistance R2 of the energy dissipation branch of the energy self-balancing power module under test, the module DC capacitor C1, and the voltage U at both ends of the module AC port R2 , U C1 , U SCR The surface temperature T of the energy dissipation branch resistor R2 of the energy self-balancing power module under test is monitored synchronously. R2 , and observe whether the energy dissipation branch resistor R2 explodes.

8. The test method for extreme working conditions of energy self-balancing power module according to claim 7 is characterized in that: Based on the total duration of the second test, according to the operating parameters and the second working state, the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking, including: During the second test duration, according to whether the energy dissipation branch resistor R2 explodes, combined with the energy dissipation branch resistor R2, the module DC capacitor C1, and the voltage U across the module AC port R2 , U C1 , U SCR The value of the surface temperature T of the energy dissipation branch resistor R2 R2 , the test state of the tested energy self-balancing power module under extreme working conditions is analyzed, and the operating parameters at the corresponding time are recorded to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

9. The test method for extreme working conditions of energy self-balancing power module according to any one of claims 1 to 8, characterized in that: The energy self-balancing power module under test is: an energy self-balancing half-bridge power module or an energy self-balancing full-bridge power module.

10. A test method for extreme working conditions of an energy self-balancing power module, characterized in that: include: A judgment unit, used to determine the stage of the extreme working condition according to the current value of the energy self-balancing power module under test, wherein the stage includes: a start-up charging stage before unlocking and a steady-state operation stage after unlocking of the energy self-balancing power module under test; A configuration unit, used to configure test tools and test environments for testing in the pre-unlocking startup charging phase and the post-unlocking steady-state operation phase, respectively; A first control unit is used to start the charging phase before unlocking, construct a first test loop, place the first test loop in the corresponding test environment, and output a current to the energy self-balancing power module under test that is the same as the actual charging current in the charging phase of the flexible direct current project startup, determine the total duration of the first test, control the energy self-balancing power module under test to always be in a locked state, and monitor in real time the first operating parameters and the first working state of each component in the energy discharge branch of the energy self-balancing power module under test; A first analysis unit is used to analyze the test state of the tested energy self-balancing power module under extreme working conditions based on the total duration of the first test, according to the first operating parameters and the first working state, and record the operating parameters at the corresponding time to obtain the extreme working condition test data of the tested energy self-balancing power module in the charging stage before unlocking; A second control unit is used to construct a second test loop in the post-unlocking steady-state operation stage, place the second test loop in the corresponding test environment, and control the operating current of the second test loop to be the same as the actual charging current in the unlocking operation stage of the flexible direct current project, determine the total duration of the second test, control the energy self-balancing power module under test to always be in a locked state, and monitor the second operating parameters and second working state of each component in the energy discharge branch of the energy self-balancing power module under test in real time; The second analysis unit is used to analyze the test state of the tested energy self-balancing power module under extreme working conditions based on the total duration of the second test, according to the operating parameters and the second working state, and record the operating parameters at the corresponding time to obtain the extreme working condition test data of the tested energy self-balancing power module in the steady-state operation stage after unlocking.

11. A test device for extreme working conditions of energy self-balancing power module, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the test method for extreme working conditions of the energy self-balancing power module according to any one of claims 1-9 according to the instructions in the program code.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program codes, and the program codes are used to execute the test method for extreme working conditions of the energy self-balancing power module according to any one of claims 1-9.

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