Method and device for controlling a traction converter

Abstract

This invention provides a traction converter control method and apparatus. The method includes: acquiring the high-voltage AC side voltage of the traction converter, and determining the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the high-voltage AC side voltage; comparing the effective value of the AC side voltage and the apparent power of the auxiliary converter to obtain a comparison result, and updating the unlocking / locking state of the fully controlled switching devices in the traction converter based on the comparison result. This invention utilizes the effective value of the AC grid voltage and the apparent power of the auxiliary converter to adaptively adjust the unlocking / locking state of the fully controlled switching devices in the traction converter circuit, reducing switching losses of the devices, improving system efficiency, and simultaneously reducing platform noise.

Description

Technical Field

[0001] This invention relates to the field of traction converter technology, and more particularly to a traction converter control method and device. Background Technology

[0002] As part of the traction system, the traction converter is responsible for supplying power to the intermediate DC circuit, traction inverter motor, and various auxiliary loads. Railway operators are constantly raising new functional and performance requirements for train traction systems, including intelligence, high efficiency and energy saving, and low noise.

[0003] Existing traction systems typically connect the traction converter to a single-phase 25kV / 50Hz power supply line via an external transformer, and then use a contactor to disconnect the transformer's secondary winding from the traction converter. Power is supplied to the intermediate DC circuit via a pre-charge unit and two parallel four-quadrant pulse rectifiers (4QC: each module is a full bridge). The intermediate DC circuit then uses an inverter to convert the DC voltage into a three-phase frequency-converted pulse voltage, supplying power to the three-phase asynchronous traction motor and simultaneously powering the auxiliary inverter.

[0004] To ensure the stability of the intermediate DC circuit power supply under static conditions, traditional four-quadrant pulse rectifiers employ a closed-loop pulse width modulation (PWM) strategy to stabilize the output voltage through closed-loop control. While this method meets the system's basic requirements for DC voltage ripple coefficient and dynamic response speed, the high switching losses at high switching frequencies result from the unlocked operation of all 4QC-controlled devices. Furthermore, the harmonic currents generated by PWM can cause high-frequency oscillations in the transformer, leading to noise pollution and impacting the working environment. Summary of the Invention

[0005] To address the problems existing in the prior art, the main objective of this invention is to provide a traction converter control method and device that reduces the switching losses of the fully controlled switching devices in the traction converter under static conditions and reduces noise harmonic pollution.

[0006] To achieve the above objectives, embodiments of the present invention provide a traction converter control method, the method comprising:

[0007] Obtain the high-voltage AC side voltage of the traction converter, and determine the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the high-voltage AC side voltage;

[0008] The effective value of the AC side voltage and the apparent power of the auxiliary converter are compared to obtain the comparison results. Based on the comparison results, the unlocking and locking status of the fully controlled switching devices in the traction converter are updated.

[0009] Optionally, in one embodiment of the present invention, the effective value of the AC side voltage and the apparent power of the auxiliary converter are compared to obtain the comparison result, which includes:

[0010] Obtain the preset grid voltage threshold range and power threshold;

[0011] Based on the grid voltage threshold range and the power threshold, a double hysteresis comparison is performed on the effective value of the AC side voltage and the apparent power of the auxiliary converter to obtain the comparison result.

[0012] Optionally, in one embodiment of the present invention, based on the grid voltage threshold range and power threshold, a double hysteresis comparison is performed on the effective value of the AC side voltage and the apparent power of the auxiliary converter to obtain the comparison results, including:

[0013] When the effective value of the AC side voltage is higher than the upper limit of the grid voltage threshold range, if the apparent power of the auxiliary converter is greater than the power threshold, the comparison result is determined to unlock the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, the comparison result is determined to lock the traction converter.

[0014] Optionally, in one embodiment of the present invention, the comparison of the effective value of the AC side voltage and the apparent power of the auxiliary converter by performing a double hysteresis loop comparison based on the grid voltage threshold range and the power threshold, and obtaining the comparison result, further includes:

[0015] When the effective value of the AC side voltage is lower than the upper limit of the grid voltage threshold range and higher than the lower limit of the grid voltage threshold range, the traction converter maintains its operating state for a preset operating time.

[0016] After a preset running time, if the apparent power of the auxiliary converter is greater than the power threshold, the comparison result is determined to unlock the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, the comparison result is determined to lock the traction converter.

[0017] Optionally, in one embodiment of the present invention, the comparison of the effective value of the AC side voltage and the apparent power of the auxiliary converter by performing a double hysteresis loop comparison based on the grid voltage threshold range and the power threshold, and obtaining the comparison result, further includes:

[0018] When the effective value of the AC side voltage is lower than the lower limit of the grid voltage threshold range, the comparison result is determined to remain in the unlocked state.

[0019] This invention also provides a traction converter control device, the device comprising:

[0020] The voltage and power module is used to acquire the high-voltage AC side voltage of the traction converter and determine the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the high-voltage AC side voltage.

[0021] The status update module is used to compare the effective value of the AC side voltage and the apparent power of the auxiliary converter, obtain the comparison result, and update the unlocking and locking status of the fully controlled switching devices in the traction converter based on the comparison result.

[0022] Optionally, in one embodiment of the present invention, the state update module includes:

[0023] The threshold acquisition unit is used to acquire the preset grid voltage threshold range and power threshold.

[0024] The comparison result unit is used to perform a double hysteresis comparison on the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the grid voltage threshold range and power threshold, and obtain the comparison result.

[0025] Optionally, in one embodiment of the present invention, the comparison result unit is further configured to: when the effective value of the AC side voltage is higher than the upper limit of the grid voltage threshold range, if the apparent power of the auxiliary converter is greater than the power threshold, then determine the comparison result as unlocking the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, then determine the comparison result as locking the traction converter.

[0026] Optionally, in one embodiment of the present invention, the comparison result unit includes:

[0027] The operating status subunit is used to maintain the operating status of the traction converter for a preset operating time when the effective value of the AC side voltage is lower than the upper limit of the grid voltage threshold range and higher than the lower limit of the grid voltage threshold range.

[0028] The comparison result subunit is used to determine the comparison result as unlocking the traction converter if the apparent power of the auxiliary converter is greater than the power threshold after a preset running time; and to determine the comparison result as locking the traction converter if the apparent power of the auxiliary converter is less than the power threshold.

[0029] Optionally, in one embodiment of the present invention, the comparison result unit is further configured to: determine the comparison result as maintaining the unlocked state when the effective value of the AC side voltage is lower than the lower limit of the grid voltage threshold range.

[0030] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described method.

[0031] The present invention also provides a computer-readable storage medium storing a computer program for performing the above-described method.

[0032] This invention utilizes the effective value of AC grid voltage and the apparent power of the auxiliary converter to adaptively adjust the lockout state of the fully controlled switching devices in the traction converter circuit, thereby reducing device switching losses, improving system efficiency, and reducing platform noise. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a flowchart of a traction converter control method according to an embodiment of the present invention;

[0035] Figure 2 This is a flowchart illustrating the comparison results obtained in an embodiment of the present invention;

[0036] Figure 3 This is a flowchart of the double hysteresis comparison in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the circuit principle of the traction converter in an embodiment of the present invention;

[0038] Figure 5 This is a flowchart of a traction converter control method in a specific embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of a traction converter control device according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the state update module in an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the comparison result unit in an embodiment of the present invention;

[0042] Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0043] This invention provides a traction converter control method and apparatus.

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figure 1The diagram shows a flowchart of a traction converter control method according to an embodiment of the present invention. The execution entity of the traction converter control method provided in this embodiment includes, but is not limited to, a computer. This invention utilizes the effective value of the AC grid voltage and the apparent power of the auxiliary converter to adaptively adjust the latch-up / unlatch-up state of the fully controlled switching devices in the traction converter circuit, reducing switching losses, improving system efficiency, and simultaneously reducing platform noise. The method shown in the diagram includes:

[0046] Step S1: Obtain the high-voltage AC side voltage of the traction converter, and determine the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the high-voltage AC side voltage.

[0047] Step S2: Compare the effective value of the AC side voltage and the apparent power of the auxiliary converter to obtain the comparison result, and update the unlocking and locking status of the fully controlled switching devices in the traction converter based on the comparison result.

[0048] The circuit diagram of the traction converter is shown below. Figure 4 As shown, the lockout status of the fully controlled switching devices in the traction converter circuit is determined based on the effective value of the AC grid voltage and the apparent power regulation of the auxiliary converter.

[0049] Furthermore, the traction system is pre-set to operate in its initial state; specifically, both the traction converter and the auxiliary converter are in a locked state. The voltage on the high-voltage AC side of the traction transformer is sampled, and the effective value U of the high-voltage AC side voltage of the traction transformer is calculated. ac The apparent power P of the auxiliary converter in the traction system is calculated by multiplying the effective values ​​of the output voltage and current of the auxiliary converter. load Specifically, using existing conventional calculation methods, the effective value of the AC side voltage and the apparent power of the auxiliary converter can be calculated. The grid voltage threshold range and power threshold can both be preset according to actual conditions.

[0050] Furthermore, the effective value of the AC side voltage U ac and the apparent power P of the auxiliary converter load Perform a double hysteresis comparison and adjust the lockout / unlock state of the fully controlled switching devices in the traction converter based on the comparison results.

[0051] As an embodiment of the present invention, such as Figure 2 As shown, the effective value of the AC side voltage and the apparent power of the auxiliary converter are compared, and the comparison results include:

[0052] Step S21: Obtain the preset grid voltage threshold range and power threshold;

[0053] Step S22: Based on the grid voltage threshold range and power threshold, perform a double hysteresis comparison on the effective value of the AC side voltage and the apparent power of the auxiliary converter to obtain the comparison result.

[0054] Among them, the pre-set network voltage threshold U d Power threshold P d The process includes: when the network voltage threshold U d Power threshold P d If the value is between the upper and lower limits of the hysteresis comparator, the current unlocking state remains unchanged; when the network voltage threshold U... d Power threshold P d If the value exceeds the upper limit of the hysteresis comparator or falls below the lower limit, the lockout state will be adjusted to the corresponding state in the following steps.

[0055] In this embodiment, based on the grid voltage threshold range and power threshold, a double hysteresis comparison is performed on the effective value of the AC side voltage and the apparent power of the auxiliary converter. The comparison results include:

[0056] When the effective value of the AC side voltage is higher than the upper limit of the grid voltage threshold range, if the apparent power of the auxiliary converter is greater than the power threshold, the comparison result is determined to unlock the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, the comparison result is determined to lock the traction converter.

[0057] In this embodiment, as Figure 3 As shown, based on the grid voltage threshold range and power threshold, a double hysteresis comparison is performed on the effective value of the AC side voltage and the apparent power of the auxiliary converter. The comparison results also include:

[0058] Step S31: When the effective value of the AC side voltage is lower than the upper limit of the grid voltage threshold range and higher than the lower limit of the grid voltage threshold range, the traction converter is kept in operation for a preset operating time.

[0059] Step S32: After a preset running time, if the apparent power of the auxiliary converter is greater than the power threshold, the comparison result is determined to unlock the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, the comparison result is determined to lock the traction converter.

[0060] In this embodiment, based on the grid voltage threshold range and the power threshold, a double hysteresis comparison is performed on the effective value of the AC side voltage and the apparent power of the auxiliary converter. The comparison result also includes: when the effective value of the AC side voltage is lower than the lower limit of the grid voltage threshold range, the comparison result is determined to be to maintain the unlocked state.

[0061] Among them, when the effective value of the grid voltage U ac Greater than the high network voltage threshold U dh (Upper limit), at this time if the apparent power P of the auxiliary converter load Greater than the power threshold P d Unlock the traction converter; if the apparent power P of the auxiliary converter is... loadLess than the power threshold P d Then the traction converter will be locked out;

[0062] Furthermore, when the effective value of the grid voltage U ac Greater than the low network voltage threshold U dl (Lower limit) and less than the high network voltage threshold U dh At the same time, the auxiliary converter maintains the traction converter's operating state for one minute after startup. After one minute, if the apparent power P of the auxiliary converter... load Greater than the power threshold P d Unlock the traction converter; if the apparent power P of the auxiliary converter is... load Less than the power threshold P d Then the traction converter will be locked out.

[0063] Furthermore, when the effective value of the grid voltage U ac Less than the low network voltage threshold U dl In this case, the traction converter will always remain in the unlocked state.

[0064] In a specific embodiment of the present invention, such as Figure 4 The diagram shown is a schematic of the traction converter circuit of this invention. The circuit includes a pre-charge unit, two four-quadrant pulse rectifiers, an inverter unit, and an auxiliary converter. The four-quadrant rectifiers use pulse width modulation (PWM) to control the output voltage. Figure 4 In the diagram, INV stands for traction inverter; AUX stands for auxiliary converter.

[0065] In this embodiment, the circuit is connected as follows: one four-quadrant pulse rectifier has DC output terminals x1 and y1 and AC output terminals a1 and b1; two four-quadrant pulse rectifiers have DC output terminals x2 and y2 and AC output terminals a2 and b2; energy storage capacitors C1 and C2 are connected between the DC output terminals; and the secondary windings T1 and T2 of the traction transformer are connected between the AC output terminals.

[0066] As shown in the power flow diagram, the external transformer connects the traction converter to a single-phase 25kV / 50Hz power supply line, supplying power to the intermediate DC circuit through a pre-charge unit and two parallel four-quadrant pulse rectifiers (4QC: each module is a full bridge). The intermediate DC circuit then converts the DC voltage into a three-phase frequency-converted pulse voltage via an inverter, supplying power to the three-phase asynchronous traction motor and simultaneously powering the auxiliary inverter.

[0067] In this invention, the fully controlled switching devices in the traction converter circuit are adaptively adjusted based on the effective value of the AC grid voltage and the apparent power of the auxiliary converter to reduce the switching losses of the devices, improve system efficiency, and reduce platform noise.

[0068] Furthermore, such as Figure 5 As shown, the specific implementation process includes the following steps:

[0069] (1) Set the traction system to work in the initial state, in which the traction converter and the auxiliary converter are both in the locked state;

[0070] (2) Sample the voltage on the high-voltage AC side of the traction transformer and calculate the effective value U of the voltage on the high-voltage AC side of the traction transformer. ac ;

[0071] (3) Calculate the apparent power P of the auxiliary converter in the traction system. load ;

[0072] (4) The effective value of the AC side voltage U ac and the apparent power P of the auxiliary converter load Perform a dual hysteresis comparison and adjust the latch-up / unlatch-up state of the fully controlled switching devices in the traction converter based on the comparison results; specifically including:

[0073] (4.1) When the effective value of the grid voltage U ac Greater than the high network voltage threshold U dh If the apparent power P of the auxiliary converter is at this time load Greater than the power threshold P d Unlock the traction converter; if the apparent power P of the auxiliary converter is... load Less than the power threshold P d Then the traction converter will be locked out;

[0074] (4.2) When the effective value of the grid voltage U ac Greater than the low network voltage threshold U dl And less than the high network voltage threshold U dh At the same time, the auxiliary converter maintains the traction converter's operating state for one minute after startup. After one minute, if the apparent power P of the auxiliary converter... load Greater than the power threshold P d Unlock the traction converter; if the apparent power P of the auxiliary converter is... load Less than the power threshold P d Then the traction converter will be locked out;

[0075] (4.3) When the effective value of the grid voltage U ac Less than the low network voltage threshold U dl In this case, the traction converter will always remain in the unlocked state.

[0076] (5) Set the network voltage threshold U d Power threshold P d The specific method is as follows:

[0077] (5.1) When the network voltage threshold U d Power threshold Pd If the value is between the upper and lower limits of the hysteresis comparator, the current unlocking state remains unchanged;

[0078] (5.2) When the network voltage threshold U d Power threshold P d If the value exceeds the upper limit of the hysteresis comparator or falls below the lower limit, the system is adjusted to the unlocking state corresponding to step 4 above.

[0079] This invention can adaptively adjust the lockout / unlock status of the fully controlled switching devices in the four-quadrant rectifier according to the operating conditions of the traction converter. While meeting the requirements for DC bus voltage ripple coefficient and dynamic response speed, it can significantly reduce switching device losses. This invention can also adjust the current path of the four-quadrant rectifier according to the operating conditions of the traction converter, allowing the current to be commutated through diodes within a certain operating range. This eliminates the noise oscillation phenomenon generated by grid harmonic currents on the traction transformer side, thus alleviating platform noise pollution.

[0080] like Figure 6 The figure shows a schematic diagram of a traction converter control device according to an embodiment of the present invention. The device shown in the figure includes:

[0081] The voltage and power module 10 is used to obtain the high-voltage AC side voltage of the traction converter and determine the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the high-voltage AC side voltage.

[0082] The status update module 20 is used to compare the effective value of the AC side voltage and the apparent power of the auxiliary converter, obtain the comparison result, and update the unlocking and locking status of the fully controlled switching devices in the traction converter according to the comparison result.

[0083] The circuit diagram of the traction converter is shown below. Figure 4 As shown, the lockout status of the fully controlled switching devices in the traction converter circuit is determined based on the effective value of the AC grid voltage and the apparent power regulation of the auxiliary converter.

[0084] Furthermore, the traction system is pre-set to operate in its initial state; specifically, both the traction converter and the auxiliary converter are in a locked state. The voltage on the high-voltage AC side of the traction transformer is sampled, and the effective value of the high-voltage AC side voltage is calculated, along with the apparent power of the auxiliary converter in the traction system. Specifically, the effective value of the AC side voltage and the apparent power of the auxiliary converter can be calculated using existing conventional calculation methods.

[0085] Furthermore, the effective value of the AC side voltage and the apparent power of the auxiliary converter are compared using a double hysteresis loop, and the lockout / unlocking state of the fully controlled switching devices in the traction converter is adjusted based on the comparison results.

[0086] As an embodiment of the present invention, such as Figure 7 As shown, the status update module 20 includes:

[0087] The threshold acquisition unit 21 is used to acquire the preset grid voltage threshold range and power threshold.

[0088] The comparison result unit 22 is used to perform a double hysteresis comparison on the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the grid voltage threshold range and the power threshold, and obtain the comparison result.

[0089] In this embodiment, the comparison result unit 22 is further used to: when the effective value of the AC side voltage is higher than the upper limit of the grid voltage threshold range, if the apparent power of the auxiliary converter is greater than the power threshold, then determine that the comparison result is to unlock the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, then determine that the comparison result is to lock the traction converter.

[0090] In this embodiment, as Figure 8 As shown, the comparison result unit 22 includes:

[0091] The operating state subunit 221 is used to maintain the operating state of the traction converter for a preset operating time when the effective value of the AC side voltage is lower than the upper limit of the grid voltage threshold range and higher than the lower limit of the grid voltage threshold range.

[0092] The comparison result subunit 222 is used to determine the comparison result as unlocking the traction converter if the apparent power of the auxiliary converter is greater than the power threshold after a preset running time; and to determine the comparison result as locking the traction converter if the apparent power of the auxiliary converter is less than the power threshold.

[0093] In this embodiment, the comparison result unit 22 is also used to: determine the comparison result as maintaining the unlocked state when the effective value of the AC side voltage is lower than the lower limit of the grid voltage threshold range.

[0094] Based on the same concept as the aforementioned traction converter control method, this invention also provides a traction converter control device. Since the principle by which this traction converter control device solves the problem is similar to that of the traction converter control method, the implementation of this traction converter control device can refer to the implementation of the traction converter control method; repeated details will not be elaborated further.

[0095] This invention utilizes the effective value of AC grid voltage and the apparent power of the auxiliary converter to adaptively adjust the lockout state of the fully controlled switching devices in the traction converter circuit, thereby reducing device switching losses, improving system efficiency, and reducing platform noise.

[0096] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described method.

[0097] The present invention also provides a computer-readable storage medium storing a computer program for performing the above-described method.

[0098] like Figure 9 As shown, the electronic device 600 may also include: a communication module 110, an input unit 120, an audio processor 130, a display 160, and a power supply 170. It is worth noting that the electronic device 600 does not necessarily need to include these components. Figure 9 All components shown; in addition, the electronic device 600 may also include Figure 9 For components not shown, please refer to existing technologies.

[0099] like Figure 9 As shown, the central processing unit 100, sometimes also referred to as a controller or operating control, may include a microprocessor or other processor device and / or logic device. The central processing unit 100 receives inputs and controls the operation of various components of the electronic device 600.

[0100] The memory 140 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned failure-related information, and also store a program for executing that information. The central processing unit 100 may execute the program stored in the memory 140 to perform information storage or processing, etc.

[0101] Input unit 120 provides input to central processing unit 100. Input unit 120 may be, for example, a keypad or touch input device. Power supply 170 provides power to electronic device 600. Display 160 displays images and text. Display may be, for example, an LCD display, but is not limited thereto.

[0102] The memory 140 can be a solid-state memory, such as a read-only memory (ROM), random access memory (RAM), a SIM card, etc. It can also be a memory that retains information even when power is off, can be selectively erased, and contains more data; examples of this type of memory are sometimes referred to as EPROMs. The memory 140 can also be some other type of device. The memory 140 includes a buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application / function storage unit 142 for storing application programs and function programs or processes for executing the operation of the electronic device 600 via the central processing unit 100.

[0103] The memory 140 may also include a data storage unit 143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 144 of the memory 140 may include various drivers for the electronic device's communication functions and / or for performing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0104] The communication module 110 is a transmitter / receiver 110 that transmits and receives signals via antenna 111. The communication module (transmitter / receiver) 110 is coupled to the central processing unit 100 to provide input signals and receive output signals, which can be the same as in a conventional mobile communication terminal.

[0105] Based on different communication technologies, multiple communication modules 110 can be configured in the same electronic device, such as cellular network modules, Bluetooth modules, and / or wireless LAN modules. The communication module (transmitter / receiver) 110 is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide audio output via the speaker 131 and receive audio input from the microphone 132, thereby enabling typical telecommunications functions. The audio processor 130 may include any suitable buffer, decoder, amplifier, etc. Additionally, the audio processor 130 is coupled to a central processing unit 100, enabling on-device recording via the microphone 132 and on-device playback of stored audio via the speaker 131.

[0106] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0107] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0108] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0109] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0110] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A traction inverter control method, characterized by, The method includes: Obtain the high-voltage AC side voltage of the traction converter, and determine the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the high-voltage AC side voltage; The effective value of the AC side voltage and the apparent power of the auxiliary converter are compared to obtain the comparison result. Based on the comparison result, the unlocking and blocking status of the fully controlled switching devices in the traction converter are updated. The comparison of the effective value of the AC side voltage and the apparent power of the auxiliary converter to obtain the comparison result includes: obtaining a preset grid voltage threshold range and a power threshold; performing a double hysteresis comparison on the effective value of the AC side voltage and the apparent power of the auxiliary converter according to the grid voltage threshold range and the power threshold to obtain the comparison result; wherein, the process of presetting the grid voltage threshold and the power threshold includes: when the grid voltage threshold and the power threshold are between the upper limit and the lower limit of the hysteresis comparator, maintaining the current unlocking state unchanged; when the grid voltage threshold and the power threshold exceed the upper limit of the hysteresis comparator or are lower than the lower limit, adjusting the corresponding unlocking state.

2. The method of claim 1, wherein, The comparison of the effective value of the AC side voltage and the apparent power of the auxiliary converter using a double hysteresis loop method, based on the grid voltage threshold range and the power threshold, yields the following comparison results: When the effective value of the AC side voltage is higher than the upper limit of the grid voltage threshold range, if the apparent power of the auxiliary converter is greater than the power threshold, the comparison result is determined to unlock the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, the comparison result is determined to lock the traction converter.

3. The method according to claim 1, characterized in that, The step of performing a double hysteresis comparison on the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the grid voltage threshold range and the power threshold, and obtaining the comparison result, further includes: When the effective value of the AC side voltage is lower than the upper limit of the grid voltage threshold range and higher than the lower limit of the grid voltage threshold range, the traction converter maintains its operating state for a preset operating time. After a preset running time, if the apparent power of the auxiliary converter is greater than the power threshold, the comparison result is determined to unlock the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, the comparison result is determined to lock the traction converter.

4. The method according to claim 1, characterized in that, The step of performing a double hysteresis comparison on the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the grid voltage threshold range and the power threshold, and obtaining the comparison result, further includes: When the effective value of the AC side voltage is lower than the lower limit of the grid voltage threshold range, the comparison result is determined to remain in the unlocked state.

5. A traction converter control device, characterized in that, The device includes: The voltage and power module is used to acquire the high-voltage AC side voltage of the traction converter and determine the effective value of the AC side voltage and the apparent power of the auxiliary converter based on the high-voltage AC side voltage. The status update module is used to compare the effective value of the AC side voltage and the apparent power of the auxiliary converter, obtain the comparison result, and update the unlocking and locking status of the fully controlled switching devices in the traction converter according to the comparison result. The status update module includes: The threshold acquisition unit is used to acquire the preset grid voltage threshold range and power threshold. The comparison result unit is used to perform a double hysteresis comparison on the effective value of the AC side voltage and the apparent power of the auxiliary converter according to the grid voltage threshold range and the power threshold, and obtain a comparison result; wherein, the process of presetting the grid voltage threshold and the power threshold includes: when the grid voltage threshold and the power threshold are between the upper limit and the lower limit of the hysteresis comparator, the current unlocking state remains unchanged; when the grid voltage threshold and the power threshold exceed the upper limit of the hysteresis comparator or are lower than the lower limit, the corresponding unlocking state is adjusted.

6. The apparatus according to claim 5, characterized in that, The comparison result unit is further configured to: when the effective value of the AC side voltage is higher than the upper limit of the grid voltage threshold range, if the apparent power of the auxiliary converter is greater than the power threshold, determine that the comparison result is to unlock the traction converter; if the apparent power of the auxiliary converter is less than the power threshold, determine that the comparison result is to lock the traction converter.

7. The apparatus according to claim 5, characterized in that, The comparison result unit includes: The operating status subunit is used to maintain the operating status of the traction converter for a preset operating time when the effective value of the AC side voltage is lower than the upper limit of the grid voltage threshold range and higher than the lower limit of the grid voltage threshold range. The comparison result subunit is used to determine, after a preset running time, whether the apparent power of the auxiliary converter is greater than the power threshold, that the comparison result is to unlock the traction converter; or if the apparent power of the auxiliary converter is less than the power threshold, that the comparison result is to lock the traction converter.

8. The apparatus according to claim 5, characterized in that, The comparison result unit is further configured to: determine that the comparison result is to remain unlocked when the effective value of the AC side voltage is lower than the lower limit of the grid voltage threshold range.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method according to any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that performs the method according to any one of claims 1 to 4.

Images