HXD2 type electric locomotive energy saving optimization method

Abstract

The application is a kind of HXD2 electric locomotive energy saving optimization method, belonging to the field of HXD2 electric locomotive network control system, which comprises the following steps: obtaining the running time period, running section, winter-summer mode conversion time of the region in the running interval and the main function parameters of different electric locomotive frequency loads; based on the obtained running time period, running section, winter-summer mode conversion time of the region in the running interval and the main function parameters of electric locomotive frequency loads, the running power of different electric locomotive frequency loads is adjusted according to the load criterion of different electric locomotive frequencies respectively. The method can also realize automatic switching of winter-summer mode according to time axis, level information, temperature and other information, thereby avoiding the inconvenience caused by manual switching; software access permission needs to be set to prevent external attacks and cause mis-switching of winter-summer mode during locomotive operation.

Description

Technical Field

[0001] This invention belongs to the field of network control systems for HXD2 electric locomotives, and relates to an energy-saving optimization method for HXD2 electric locomotives. Background Technology

[0002] Currently, over 1,000 HXD2 electric locomotives are deployed across various locomotive depots nationwide, making them a major traction locomotive type. The HXD2 locomotive mainly consists of a network control system, a traction control system, an auxiliary system, and a braking system. The auxiliary system comprises an auxiliary converter system, a charger, auxiliary loads, an auxiliary control unit (ACU), and corresponding control circuits. The ACU is the core control unit of the auxiliary system, used to control and manage the auxiliary power supply system composed of the auxiliary converter and other electrical equipment. The ACU can control the auxiliary converter to operate in either variable frequency / variable voltage (VVVF) mode or constant frequency / constant voltage (CVCF) mode, exchanging data with the MPU via the MVB bus.

[0003] Each HXD2 electric locomotive consists of two sections, A and B. Each section has two auxiliary converters: Auxiliary Converter 1 and Auxiliary Converter 2. Auxiliary Converter 1 provides a fixed-frequency (CVCF) output, supplying power to loads that do not require frequency conversion, such as pumps, chargers, heating systems, and living facilities, with an output of AC 380V (50Hz). Auxiliary Converter 2 provides a variable-frequency (VVVF) output, supplying power to loads that require frequency conversion, such as wind turbines, with four frequency conversion levels: 0Hz, 190V (25Hz), 304V (40Hz), and 380V (50Hz). The operating frequency of Auxiliary Converter 2 is controlled by the locomotive's central control unit (MPU), and its operating frequency varies depending on the season.

[0004] Currently, there is no device or tool that can automatically set the operating frequency of the auxiliary converter 2. The technical implementation is generally to set the operating frequency of the auxiliary converter 2 seasonally.

[0005] According to the locomotive depot's winter protection management requirements, the HXD2 electric locomotive operates in summer mode from March to November each year, and in winter mode from November to March of the following year. The winter / summer mode needs to be manually set on the locomotive driver's cab display screen. The operating frequency of auxiliary converter 2 differs in different modes.

[0006] Due to my country's vast territory and varying temperatures across different regions, and the widespread deployment of HXD2 electric locomotives throughout the country, the current operating mode of these locomotives suffers from inadequate and irrational control, resulting in prolonged summer operation and significant power consumption. Actual usage data reveals that during stops at intermediate stations, the locomotives consume up to 90 kilowatt-hours under summer control mode.

[0007] The HXD2 electric locomotive auxiliary system mainly supplies power to auxiliary facilities such as locomotive traction fans and cooling tower fans. The fixed-frequency load part has little room for optimization, while the variable-frequency load part can adjust the power of traction fans, cooling tower fans, and machine room fans according to the season and locomotive operating conditions, and has greater room for optimization. Summary of the Invention

[0008] To address the aforementioned problems, the present invention provides the following technical solution: an energy-saving optimization method for HXD2 electric locomotives, comprising the following steps:

[0009] To obtain the operating time period, operating section, winter and summer mode switching time of the region within the operating section of the electric locomotive, and the main functional parameters of the frequency conversion load of different electric locomotives;

[0010] Based on the obtained operating time period, operating section, winter and summer mode switching time of the region within the operating section, and the main functional parameters of the electric locomotive frequency converter load, the operating power of the electric locomotive frequency converter load is adjusted according to the load criteria of different electric locomotive frequencies.

[0011] Furthermore, the different electric locomotive frequency conversion loads include: steering handle, main transformer, main converter and traction motor.

[0012] Furthermore: the criterion for determining the direction handle is:

[0013] When the direction of the steering handle is zero, and when the seasonal mode of the electric locomotive is winter, adjust the operating frequency of the steering handle to 0Hz.

[0014] When the direction of the steering handle is zero, and when the seasonal mode of the electric locomotive is summer, adjust the operating frequency of the steering handle to 25Hz.

[0015] When the direction of the steering handle is not zero, and when the steering handle is at level ≤ 3, adjust the operating frequency of the steering handle to 40Hz until the direction of the steering handle is zero, and continue to run at 40Hz for 2 minutes.

[0016] When the direction of the steering handle is not zero, and when the steering handle is at a level greater than 3, adjust the operating frequency of the steering handle to 50Hz until the direction of the steering handle is zero, and continue to run at 50Hz for 2 minutes.

[0017] Furthermore: the criterion for the main transformer is:

[0018] When the oil temperature of the main transformer is ≤40℃, adjust the operating frequency of the main transformer to 0Hz;

[0019] When 50℃ > main transformer oil temperature > 40℃, and when the main transformer oil temperature is obtained by gradually increasing from 40℃, adjust the main transformer operating frequency to 0Hz.

[0020] When 50℃ > main transformer oil temperature > 40℃, and when the main transformer oil temperature is obtained by gradually decreasing from 50℃, adjust the main transformer operating frequency to 25Hz.

[0021] When 70℃ > the oil temperature of the main transformer is ≥ 50℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the main transformer to 25Hz.

[0022] When 70℃ > the oil temperature of the main transformer is ≥ 50℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of the main transformer to 40Hz.

[0023] When the oil temperature of the main transformer is ≥70℃, adjust the operating frequency of the main transformer to 70Hz.

[0024] Furthermore: the criterion for the main converter is:

[0025] When the temperature of the main converter is ≤30℃, adjust the operating frequency of the main transformer to 0Hz;

[0026] When 40℃ > main transformer oil temperature > 30℃, and when the main transformer oil temperature is obtained by gradually increasing from 30℃, adjust the main transformer operating frequency to 0Hz.

[0027] When 40℃ > main transformer oil temperature > 30℃, and when the main transformer oil temperature is obtained by gradually decreasing from 40℃, adjust the main transformer operating frequency to 25Hz.

[0028] When 50℃ > the temperature of the main converter ≥ 40℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the main transformer to 25Hz.

[0029] When 50℃ > the temperature of the main converter is ≥ 40℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of the main transformer to 40Hz.

[0030] When the temperature of the main converter is ≥50℃, adjust the operating frequency of the main transformer to 50Hz.

[0031] Furthermore: the criterion for the traction machine is:

[0032] The criterion for the traction machine is:

[0033] When the temperature of the traction machine is ≤70℃, adjust the operating frequency of the traction machine to 0Hz;

[0034] When 80℃ > traction machine oil temperature > 70℃, and when the traction machine oil temperature is gradually increased from 70℃, adjust the traction machine's operating frequency to 0Hz.

[0035] When 80℃ > traction machine oil temperature > 70℃, and when the traction machine oil temperature is gradually decreasing from 80℃, adjust the traction machine's operating frequency to 25Hz.

[0036] When 150℃ > traction machine temperature ≥ 80℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the traction machine to 25Hz.

[0037] When 150℃ > traction machine temperature ≥ 80℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of the traction machine to 40Hz.

[0038] When the temperature of the traction machine is ≥150℃, adjust the operating frequency of the traction machine to 50Hz.

[0039] Furthermore, the winter-summer mode switching time in different regions within the operating section is determined by retrieving and summarizing the historical ambient temperature along the section where the electric locomotive operates, and based on the daily temperature change patterns in each region along the line.

[0040] An energy-saving optimization device for HXD2 electric locomotives, comprising:

[0041] Acquisition module: used to acquire the operating time period, operating section, winter and summer mode switching time in different regions within the operating section of the electric locomotive, and the main functional parameters of the frequency conversion load of different electric locomotives;

[0042] Adjustment module: Based on the acquired operating time period, operating section, winter and summer mode switching time in different regions within the operating section, and main functional parameters of the frequency conversion load of different electric locomotives, the module adjusts the operating power of the frequency conversion load of different electric locomotives according to the load criteria of different electric locomotive frequencies.

[0043] An energy-saving optimization system for HXD2 electric locomotives includes a download tool, an Ethernet interface, an MPU, and a display screen;

[0044] The download tool is used to connect an energy-saving optimization method for HXD2 electric locomotives to the MPU via an Ethernet interface.

[0045] The energy-saving optimization method for HXD2 electric locomotives according to claims 1-7 is run in the MPU.

[0046] The display screen receives the running results of the MPU and displays the running results.

[0047] This invention provides an energy-saving optimization method for HXD2 electric locomotives. The aim is to determine a reasonable winter / summer mode control strategy, modifying the HXD2 electric locomotive's winter / summer mode from a manual setting to an automatic mode controlled by a time axis, and setting modification permissions. This allows the locomotive to automatically switch between winter and summer modes based on information such as time axis, stage information, and temperature, thus avoiding the inconvenience of manual switching. By setting software access permissions, it prevents external attacks that could cause accidental switching of winter / summer modes during locomotive operation. When the locomotive is located in a low-latitude region with high temperatures, the traction motor is not operating when the locomotive is parked, and the converter generates less heat, the power of the traction fan and cooling tower fan can be reduced or even shut down to save energy and reduce noise. This method also enables automatic switching between winter and summer modes based on information such as time axis, stage information, and temperature, thus avoiding the inconvenience of manual switching; however, setting software access permissions is necessary to prevent external attacks that could cause accidental switching of winter / summer modes during locomotive operation. Attached Figure Description

[0048] 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 or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a flowchart of the method;

[0050] Figure 2 The system's composition diagram. Detailed Implementation

[0051] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0055] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0056] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0058] An energy-saving optimization method for HXD2 electric locomotives includes the following steps:

[0059] S1: Obtain the operating time period, operating section, winter / summer mode switching time of the region within the operating section, and the main functional parameters of the frequency conversion load of different electric locomotives;

[0060] S2: Based on the obtained operating time period, operating section, winter and summer mode switching time of the region within the operating section, and main functional parameters of the electric locomotive's frequency converter load, adjust the operating power of the electric locomotive's frequency converter load according to the load criteria of the electric locomotive frequency.

[0061] The HXD2 electric locomotive system automatically calibrates its time.

[0062] Steps S1 and S2 are executed sequentially;

[0063] Furthermore, the electric locomotive's frequency conversion load includes: a steering handle, a main transformer, a main converter, and a traction motor. The steering handle has forward, backward, and neutral positions, which correspond to the forward, reverse, and neutral gears for starting the locomotive; the ACU2 (auxiliary converter 2) also performs frequency conversion based on the position of the steering handle.

[0064] Cooling tower fans and machine room fans are variable frequency components; adjusting the frequency of ACU2 is equivalent to adjusting them.

[0065] Furthermore: the criterion for determining the direction handle is:

[0066] When the direction of the steering handle is zero, and when the seasonal mode of the electric locomotive is winter, adjust the operating frequency of the steering handle to 0Hz.

[0067] When the direction of the steering handle is zero, and when the seasonal mode of the electric locomotive is summer, adjust the operating frequency of the steering handle to 25Hz.

[0068] When the direction of the steering handle is not zero, and when the steering handle is at level ≤ 3, adjust the operating frequency of the steering handle to 40Hz until the direction of the steering handle is zero, and continue to run at 40Hz for 2 minutes.

[0069] When the direction of the steering handle is not zero, and when the steering handle is at a level greater than 3, adjust the operating frequency of the steering handle to 50Hz until the direction of the steering handle is zero, and continue to run at 50Hz for 2 minutes.

[0070] The ACU2 is a frequency converter with four operating frequencies: 0, 25, 40, and 50 Hz.

[0071] Furthermore: the criterion for the main transformer is:

[0072] When the oil temperature of the main transformer is ≤40℃, adjust the operating frequency of the main transformer to 0Hz;

[0073] When 50℃ > main transformer oil temperature > 40℃, and when the main transformer oil temperature is obtained by gradually increasing from 40℃, adjust the main transformer operating frequency to 0Hz.

[0074] When 50℃ > main transformer oil temperature > 40℃, and when the main transformer oil temperature is obtained by gradually decreasing from 50℃, adjust the main transformer operating frequency to 25Hz.

[0075] When 70℃ > the oil temperature of the main transformer is ≥ 50℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the main transformer to 25Hz.

[0076] When 70℃ > the oil temperature of the main transformer is ≥ 50℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of the main transformer to 40Hz.

[0077] When the oil temperature of the main transformer is ≥70℃, adjust the operating frequency of the main transformer to 70Hz.

[0078] Furthermore: the criterion for the main converter is:

[0079] When the temperature of the main converter is ≤30℃, adjust the operating frequency of the main transformer to 0Hz;

[0080] When 40℃ > main converter oil temperature > 30℃, and when the main transformer oil temperature is obtained by gradually increasing from 30℃, adjust the main transformer operating frequency to 0Hz.

[0081] When 40℃ > main converter oil temperature > 30℃, and when the main transformer oil temperature is obtained by gradually decreasing from 40℃, adjust the main transformer operating frequency to 25Hz.

[0082] When 50℃ > the temperature of the main converter ≥ 40℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the main transformer to 25Hz.

[0083] When 50℃ > the temperature of the main converter is ≥ 40℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of the main transformer to 40Hz.

[0084] When the temperature of the main converter is ≥50℃, adjust the operating frequency of the main transformer to 50Hz.

[0085] Furthermore: the criterion for the traction machine is:

[0086] The criterion for the traction machine is:

[0087] When the temperature of the traction machine is ≤70℃, adjust the operating frequency of the traction machine to 0Hz;

[0088] When 80℃ > traction machine oil temperature > 70℃, and when the traction machine oil temperature is gradually increased from 70℃, adjust the traction machine's operating frequency to 0Hz.

[0089] When 80℃ > traction machine oil temperature > 70℃, and when the traction machine oil temperature is gradually decreasing from 80℃, adjust the traction machine's operating frequency to 25Hz.

[0090] When 150℃ > traction machine temperature ≥ 80℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the traction machine to 25Hz.

[0091] When 150℃ > traction machine temperature ≥ 80℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of the traction machine to 40Hz.

[0092] When the temperature of the traction machine is ≥150℃, adjust the operating frequency of the traction machine to 50Hz.

[0093] Furthermore, the process for determining the winter-summer mode switching time in different regions within the operating section is as follows: the historical ambient temperature along the line where the electric locomotive operates is retrieved and summarized, and the winter-summer mode switching time is determined based on the daily temperature change patterns in each region along the line.

[0094] The purpose of this method is to determine a reasonable winter and summer mode control strategy, and to change the winter and summer modes of the HXD2 electric locomotive from a manual setting mode to an automatic mode controlled by a time axis.

[0095] It can automatically adjust the appropriate winter and summer control mode switching temperature based on the historical ambient temperature along the railway line where the HXD2 electric locomotive is stationed, as well as the daily temperature variation patterns in various regions along the railway line.

[0096] An energy-saving optimization device for HXD2 electric locomotives, comprising:

[0097] Acquisition module: used to acquire the operating time period, operating section, winter and summer mode switching time in different regions within the operating section of the electric locomotive, and the main functional parameters of the frequency conversion load of different electric locomotives;

[0098] Adjustment module: Based on the acquired operating time period, operating section, winter and summer mode switching time in different regions within the operating section, and main functional parameters of the frequency conversion load of different electric locomotives, the module adjusts the operating power of the frequency conversion load of different electric locomotives according to the load criteria of different electric locomotive frequencies.

[0099] A reasonable winter and summer mode control strategy was determined. Based on the actual operating range of the locomotive, the temperature along the route was collected. The manual control mode of the MPU of the HXD2 locomotive was changed to an automatic mode that controls according to the time axis, and modification permissions were set.

[0100] An energy-saving optimization system for HXD2 electric locomotives includes a download tool, an Ethernet interface, an MPU, and a DDU display screen;

[0101] The download tool is used to connect an energy-saving optimization method for HXD2 electric locomotives to the MPU via an Ethernet interface; the download tool uses a dedicated timeline program.

[0102] The energy-saving optimization method for the HXD2 electric locomotive is run in the MPU.

[0103] The DDU display screen receives the running results of the MPU and displays the running results.

[0104] The HXD2 electric locomotive's MPU winter and summer control modes meet the year-round winter and summer mode control strategies of different regions across the country, and must be controlled according to month, day, hour, minute, and second.

[0105] The time interval for the MPU winter and summer automatic control modes of the HXD2 electric locomotive must not exceed 2 seconds.

[0106] MPU winter / summer mode modification permission settings protection.

[0107] The MPU system of the HXD electric locomotive automatically calibrates the time, and the error must not exceed 2 seconds.

[0108] Once the relevant parameters of the timeline software, such as year, month, day, hour, minute, and second, are set, the MPU will send the current setting status to the DDU display screen so that the driver can monitor the locomotive's winter / summer mode in a timely manner.

[0109] The MPU automatically sends a request for operating frequency to the auxiliary converter 2 (ACU2) based on the current setting. After receiving the request for operating frequency, the auxiliary converter 2 (ACU2) will operate according to the current setting.

[0110] The MPU winter and summer control mode can meet the year-round winter and summer mode control strategies of different regions across the country, and the control accuracy can reach the second level.

[0111] The MPU winter / summer mode has access restrictions, allowing only qualified technicians to operate it.

[0112] The MPU winter / summer mode system can automatically calibrate with the vehicle's time with an error of no more than 1 second.

[0113] MPU can flexibly switch between winter and summer modes based on the user-defined time, without the need for manual settings.

[0114] Through this invention and its improvement on the mass production of locomotives, it is estimated that each HXD2 electric locomotive will save over 100,000 kilowatt-hours of electricity per month, equivalent to approximately 100,000 RMB. This will result in a cumulative annual electricity saving of 400 million RMB for over 1,000 trains nationwide, demonstrating a significant energy-saving effect.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving optimization method for HXD2 electric locomotives, characterized in that: Includes the following steps: To obtain the operating time period, operating section, winter and summer mode switching time of the region within the operating section of the electric locomotive, and the main functional parameters of the frequency conversion load of different electric locomotives; Based on the obtained operating time period, operating section, winter and summer mode switching time of the region within the operating section, and main functional parameters of the electric locomotive frequency converter load, the operating frequency of the different electric locomotive frequency converter loads is adjusted according to the load criteria of the different electric locomotive frequency converters. The winter-summer mode switching time for different regions within the operating section is determined by retrieving and summarizing the historical ambient temperature along the operating section of the electric locomotive, and based on the daily temperature change patterns of each region along the line. The different frequency conversion loads of the electric locomotives include: steering handle, main transformer, main converter and traction motor; The criterion for determining the direction handle is: When the direction of the steering handle is zero, and when the seasonal mode of the electric locomotive is winter, adjust the operating frequency of the steering handle to 0Hz. When the direction of the steering handle is zero, and when the seasonal mode of the electric locomotive is summer, adjust the operating frequency of the steering handle to 25Hz. When the direction of the steering handle is not zero, and when the steering handle is at level ≤ 3, adjust the operating frequency of the steering handle to 40Hz until the direction of the steering handle is zero, and continue to run at 40Hz for 2 minutes. When the direction of the steering handle is not zero, and when the steering handle is at a level greater than 3, adjust the operating frequency of the steering handle to 50Hz until the direction of the steering handle is zero, and continue to run at 50Hz for 2 minutes.

2. The energy-saving optimization method for HXD2 electric locomotives according to claim 1, characterized in that: The criterion for the main transformer is: When the oil temperature of the main transformer is ≤40℃, adjust the operating frequency of the main transformer to 0Hz; When 50℃ > main transformer oil temperature > 40℃, and when the main transformer oil temperature is obtained by gradually increasing from 40℃, adjust the main transformer operating frequency to 0Hz. When 50℃ > main transformer oil temperature > 40℃, and when the main transformer oil temperature is obtained by gradually decreasing from 50℃, adjust the main transformer operating frequency to 25Hz. When 70℃ > the oil temperature of the main transformer is ≥ 50℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the main transformer to 25Hz. When 70℃ > the oil temperature of the main transformer is ≥ 50℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of the main transformer to 40Hz. When the oil temperature of the main transformer is ≥70℃, adjust the operating frequency of the main transformer to 70Hz.

3. The energy-saving optimization method for HXD2 electric locomotives according to claim 1, characterized in that: The criterion for the main converter is: When the temperature of the main converter is ≤30℃, adjust the operating frequency of the main converter to 0Hz. When 40℃ > oil temperature of main converter > 30℃, and when the oil temperature of main converter is obtained by gradually increasing from 30℃, adjust the operating frequency of main converter to 0Hz. When 40℃ > oil temperature of main converter > 30℃, and when the oil temperature of main converter is obtained by gradually decreasing from 40℃, adjust the operating frequency of main converter to 25Hz. When 50℃ > the temperature of the main converter is ≥ 40℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the main converter to 25Hz. When 50℃ > the temperature of the main converter is ≥ 40℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of the main converter to 40Hz. When the temperature of the main converter is ≥50℃, adjust the operating frequency of the main converter to 50Hz.

4. The energy-saving optimization method for HXD2 electric locomotives according to claim 1, characterized in that: The criterion for the traction motor is: The criterion for the traction motor is: When the temperature of the traction motor is ≤70℃, adjust the operating frequency of the traction motor to 0Hz; When 80℃ > traction motor oil temperature > 70℃, and when the traction motor oil temperature is gradually increased from 70℃, adjust the traction motor operating frequency to 0Hz. When 80℃ > traction motor oil temperature > 70℃, and when the traction motor oil temperature is gradually decreasing from 80℃, adjust the traction motor operating frequency to 25Hz. When 150℃ > traction motor temperature ≥ 80℃, and when the seasonal mode of electric locomotive operation is winter, adjust the operating frequency of the traction motor to 25Hz. When 150℃ > traction motor temperature ≥ 80℃, and when the seasonal mode of electric locomotive operation is summer, adjust the operating frequency of traction motor to 40Hz. When the temperature of the traction motor is ≥150℃, adjust the operating frequency of the traction motor to 50Hz.

5. An energy-saving optimization device for HXD2 type electric locomotives, characterized in that: include: Acquisition module: used to acquire the operating time period, operating section, winter and summer mode switching time in different regions within the operating section of the electric locomotive, and the main functional parameters of the frequency conversion load of different electric locomotives; Adjustment module: Based on the acquired operating time period, operating section, winter / summer mode switching time in different regions within the operating section, and main functional parameters of the variable frequency load of different electric locomotives, the module adjusts the operating frequency of different electric locomotives according to the load criteria of the variable frequency load of different electric locomotives. The different frequency conversion loads of the electric locomotives include: steering handle, main transformer, main converter and traction motor; The winter-summer mode switching time for different regions within the operating section is determined by retrieving and summarizing the historical ambient temperature along the operating section of the electric locomotive, and based on the daily temperature change patterns of each region along the line. The criterion for determining the direction handle is: When the direction of the steering handle is zero, and when the seasonal mode of the electric locomotive is winter, adjust the operating frequency of the steering handle to 0Hz. When the direction of the steering handle is zero, and when the seasonal mode of the electric locomotive is summer, adjust the operating frequency of the steering handle to 25Hz. When the direction of the steering handle is not zero, and when the steering handle is at level ≤ 3, adjust the operating frequency of the steering handle to 40Hz until the direction of the steering handle is zero, and continue to run at 40Hz for 2 minutes. When the direction of the steering handle is not zero, and when the steering handle is at a level greater than 3, adjust the operating frequency of the steering handle to 50Hz until the direction of the steering handle is zero, and continue to run at 50Hz for 2 minutes.

6. An energy-saving optimization system for HXD2 electric locomotives, characterized in that: Includes download tools, Ethernet interface, MPU and display screen; The download tool is used to connect the energy-saving optimization method for HXD2 electric locomotive as described in any one of claims 1-4 to the MPU via the Ethernet interface. The energy-saving optimization method for HXD2 electric locomotives according to any one of claims 1-4 is run in the MPU. The display screen receives the running results of the MPU and displays the running results.

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