A hybrid shunting locomotive control system based on four-quadrant rectification

Abstract

The present invention discloses a hybrid shunting locomotive control system based on four-quadrant rectification. The control system comprises at least: a power battery, a diesel generator set, a four-quadrant rectifier module, a pre-charging module, and a traction motor. The power battery is electrically connected to the traction motor via the pre-charging module. The diesel generator set is connected to the pre-charging module and the power battery via the four-quadrant rectifier module, and is electrically connected to the traction motor via the pre-charging module. The traction motor is powered by the power battery and / or the diesel generator set. This control system overcomes the complex control strategies and high control difficulty inherent in conventional technologies.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy shunting locomotives, and in particular relates to a hybrid shunting locomotive control system based on four-quadrant rectification. Background Art

[0002] Existing shunting locomotives are primarily diesel-powered, electric-driven, or hydraulic-driven, and lack hybrid power control logic. Some new energy hybrid shunting locomotives utilize dedicated diesel engines and main generators, primarily matching the diesel engine's characteristic curve with the main generator's. This results in complex control strategies and significant control challenges.

[0003] Therefore, there is an urgent need for a hybrid vehicle shunting control system. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a hybrid shunting locomotive control system based on four-quadrant rectification. The structural setting of this control system solves the problems of complex control strategy and high control difficulty in traditional technology.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A hybrid shunting locomotive control system based on four-quadrant rectification, the shunting locomotive control system comprising at least: a power battery, a diesel generator set, a four-quadrant rectifier module, a pre-charging module, and a traction motor; the power battery is electrically connected to the traction motor via the pre-charging module; the diesel generator set is respectively connected to the pre-charging module and the power battery via the four-quadrant rectifier module, and is electrically connected to the traction motor via the pre-charging module; the traction motor is powered by the power battery and / or the diesel generator set.

[0007] According to a preferred embodiment, the shunting locomotive control system further includes an industrial generator set, which is connected to the power battery and the traction motor respectively via the four-quadrant rectifier module.

[0008] According to a preferred embodiment, the shunting locomotive control system also includes a locomotive auxiliary system, the power battery is connected to the locomotive auxiliary system via the four-quadrant rectifier module to supply power to the locomotive auxiliary system; the diesel generator set and the industrial generator set are connected to the locomotive auxiliary system to supply power to the locomotive auxiliary system; the locomotive auxiliary system includes at least a traction motor ventilator and an air conditioning / domestic electricity unit.

[0009] According to a preferred embodiment, when the shunting locomotive control system is in a pure electric operating state, the power battery supplies power to the traction motor, and at the same time, the power battery supplies power to the auxiliary system through a four-quadrant rectifier module.

[0010] According to a preferred embodiment, when the shunting locomotive control system is in pure electric operation, the four-quadrant rectifier module operates in inverter mode, and the four-quadrant rectifier module outputs 380V / 50Hz AC power as an inverter, which is then supplied to the auxiliary system after sinusoidal wave filtering.

[0011] According to a preferred embodiment, when the shunting locomotive control system is in a pure diesel operating state, the power battery is disconnected from the pre-charging module, and the diesel generator set supplies power to the traction motor via a four-quadrant rectifier module.

[0012] According to a preferred embodiment, when the shunting locomotive control system is in a pure diesel operating state, the four-quadrant rectifier module operates in a PWM rectification mode and outputs a constant DC608V DC voltage.

[0013] According to a preferred embodiment, when the shunting locomotive control system is in a mixed working condition, when the shunting locomotive is in a low handle position, the power battery preferentially supplies power to the traction motor. When the power battery SOC is lower than 30%, the diesel generator set is started to supply power to the traction motor. When the diesel generator set meets the traction power demand, the remaining power is used to charge the power battery. When the shunting locomotive is in a high handle position, the diesel generator is started and the output of the four-quadrant rectifier module is controlled to realize the mixed use of the diesel generator set and the power battery to supply power to the traction motor.

[0014] According to a preferred embodiment, when the shunting locomotive control system is in a mixed working condition and the shunting locomotive is in a low handle position, the four-quadrant rectifier module operates in a PWM rectifier mode, and the four-quadrant rectifier module controls the output constant current to charge the power battery until the SOC of the power battery is higher than 95%, and then the diesel generator set stops working.

[0015] According to a preferred embodiment, when the shunting locomotive control system is in ground charging mode, the industrial generator set charges the power battery through a four-quadrant rectifier module, and the four-quadrant rectifier module operates in PWM rectification mode, and the four-quadrant rectifier module controls the output constant current to charge the power battery.

[0016] The aforementioned main solution of the present invention and its further options can be freely combined to form multiple solutions, all of which are solutions that can be adopted and protected by the present invention; and the (non-conflicting options) of the present invention can also be freely combined with each other and with other options. After understanding the solutions of the present invention, those skilled in the art will understand that there are many combinations based on existing technology and common knowledge, all of which are technical solutions to be protected by the present invention, and these are not exhaustive here.

[0017] The beneficial effects of this invention are as follows: The four-quadrant rectifier module in this invention has two operating modes, functioning as both a PWM rectifier and an inverter, thereby simplifying system configuration and facilitating maintenance. A comprehensive software control strategy enables seamless hybrid operation of the diesel generator set and power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a system topology diagram of the shunting locomotive control system of the present invention;

[0019] Figure 2 This is a schematic diagram of the power battery power-on logic in the shunting locomotive control system of the present invention;

[0020] Figure 3 The diagram is a logic diagram of diesel engine starting in the shunting locomotive control system of the present invention. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0022] It should be noted that in order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0023] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate positions or relationships typically used when the product of the invention is in use. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0026] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] In addition, the present invention would like to point out that, in the present invention, unless the specific structure, connection relationship, positional relationship, power source relationship, etc. are specifically written out, the structure, connection relationship, positional relationship, power source relationship, etc. involved in the present invention are all known to those skilled in the art based on the existing technology without creative work.

[0028] Example 1:

[0029] refer to Figure 1 As shown, the present invention discloses a hybrid shunting locomotive control system based on four-quadrant rectification. The shunting locomotive control system includes: a power battery, a diesel generator set, an industrial generator set, a four-quadrant rectifier module, a pre-charging module, a traction motor, and a locomotive auxiliary system. The industrial generator set includes but is not limited to hydroelectric generators, wind turbines, and thermal power generators.

[0030] Preferably, the power battery is electrically connected to the traction motor via a pre-charging module. The diesel generator set is connected to the pre-charging module and the power battery via the four-quadrant rectifier module, and is electrically connected to the traction motor via the pre-charging module. The traction motor is powered by the power battery and / or the diesel generator set.

[0031] Preferably, the industrial generator set is connected to the power battery and the traction motor respectively via the four-quadrant rectifier module.

[0032] Preferably, the power battery is connected to the locomotive auxiliary system via the four-quadrant rectifier module to supply power to the locomotive auxiliary system.

[0033] Preferably, the diesel generator set and the industrial generator set are connected to the locomotive auxiliary system to provide power for the locomotive auxiliary system.

[0034] Preferably, the locomotive auxiliary system includes at least a traction motor ventilator and an air conditioning / domestic electricity unit.

[0035] This shunting locomotive control system uses a four-quadrant rectifier module to boost the voltage of electricity generated by industrial general-purpose generators and diesel generators, then supply the traction circuit independently or in combination with a power battery. When the industrial generators and diesel generators are not operating, the four-quadrant rectifier module acts as an inverter to output 380V / 50Hz AC power, which is then filtered through a sinusoidal wave and supplied to auxiliary systems. This four-quadrant rectifier module has two operating modes: it can function as both a PWM rectifier and an inverter, simplifying system configuration and facilitating maintenance.

[0036] Preferably, when the shunting locomotive control system is in a pure electric operating state, the power battery supplies power to the traction motor, and at the same time, the power battery supplies power to the auxiliary system through a four-quadrant rectifier module.

[0037] Furthermore, when the shunting locomotive control system is in pure electric operation, the four-quadrant rectifier module operates in inverter mode, and the four-quadrant rectifier module outputs 380V / 50Hz AC power as an inverter, which is then supplied to the auxiliary system after sinusoidal wave filtering.

[0038] Preferably, in pure electric operation, the power battery directly supplies power to the traction circuit or traction motor. During traction, power is supplied to the traction inverter. The locomotive control unit sets torque based on the locomotive handle position, and the frequency converter controls motor torque. During regenerative braking, the locomotive control unit sets braking power to the traction inverter based on the locomotive handle position, limiting the regenerative braking current by controlling the power.

[0039] Preferably, the minimum available SOC of the power battery is limited to 15% under pure electric operation. At the same time, the locomotive control unit controls the four-quadrant rectifier module to operate in inverter mode. The four-quadrant rectifier module acts as an inverter to output 380V / 50Hz AC power, which is then supplied to the auxiliary systems after sinusoidal filtering.

[0040] Preferably, reference Figure 2As shown. Power battery power-on logic: After the control power supply is powered on, under the condition that the locomotive control unit is working normally, the locomotive sends a wake-up signal to the BMS system, and the BMS management system starts working. When the key switch is turned on, the locomotive control unit receives the master control key switch signal, and the locomotive control unit system outputs a power-on signal to the BMS system, and the BMS management system closes the high-voltage box contactor. When the locomotive control unit detects the closing signal of the BMS system high-voltage box contactor, the locomotive control unit controls the power battery pre-charging contactor to close, and the power battery charges the intermediate DC circuit capacitor through the pre-charging resistor. When the intermediate DC circuit voltage is greater than 480V, the discharge contactor is turned on, and the power battery starts to supply power to the intermediate DC circuit, thereby supplying power to the traction motor.

[0041] Furthermore, during the power-on process of the power battery, the locomotive control unit itself detects whether there is a fault in the relevant system that affects the high voltage. The locomotive control unit communicates with the BMS, and the BMS sends self-test status data. If there is no fault data that affects the high voltage, and there is no fault in the relevant system of the locomotive control unit that affects the high voltage, the locomotive control unit sends a high voltage signal to the BMS system. The locomotive control unit itself detects whether there is a fault in the relevant system that requires the high voltage to be lowered. The locomotive control unit communicates with the BMS to receive information from the BMS system whether there is a fault that requires the high voltage to be lowered. If there is a fault that requires the high voltage to be lowered, the locomotive control unit first controls the locomotive to unload and stop discharging or charging the power battery. After disconnecting the relevant contactors, the locomotive control unit cancels the "high voltage signal".

[0042] Preferably, when the shunting locomotive control system is in a pure diesel operating state, the power battery is disconnected from the pre-charging module, and the diesel generator set supplies power to the traction motor via a four-quadrant rectifier module. Regenerative braking is prohibited in pure diesel operating state.

[0043] Furthermore, when the shunting locomotive control system is in a pure diesel operating condition, the four-quadrant rectifier module operates in a PWM rectification mode and outputs a constant DC608V DC voltage.

[0044] Preferably, if Figure 3As shown. When the shunting locomotive control system is in a mixed working condition. When the shunting locomotive is in a low handle position, for example, the handle position is lower than 5. The power battery will give priority to supplying power to the traction motor. When the power battery SOC is lower than 30%, the diesel generator set will be started to supply power to the traction motor. When the diesel generator set meets the traction power demand, the remaining power will be used to charge the power battery. When the shunting locomotive is in a high handle position, for example, the handle position is higher than 5. Start the diesel generator and control the output of the four-quadrant rectifier module to realize the mixed power supply of the diesel generator set and the power battery to the traction motor. Among them, the high handle position and the low handle position refer to the high gear and low gear positions of the driver controller operated by the driver. The high handle position means that the locomotive is to accelerate.

[0045] Furthermore, when the shunting locomotive control system is in a mixed operating condition and the shunting locomotive is in a low handle position, the four-quadrant rectifier module operates in a PWM rectification mode, and the four-quadrant rectifier module controls the output constant current to charge the power battery until the SOC of the power battery is higher than 95%, and then the diesel generator set stops working.

[0046] Preferably, when the shunting locomotive control system is in ground charging mode, the industrial generator set charges the power battery through a four-quadrant rectifier module, and the four-quadrant rectifier module operates in PWM rectification mode, and the four-quadrant rectifier module controls the output constant current to charge the power battery.

[0047] The four-quadrant rectifier module in this invention has two operating modes, acting as both a PWM rectifier and an inverter, thus simplifying system configuration and facilitating maintenance. A comprehensive software control strategy enables perfect hybrid operation of the diesel generator set and power battery.

[0048] The aforementioned basic examples and their respective alternatives can be freely combined to form a plurality of embodiments, all of which are applicable and claimed embodiments of the present invention. In the scheme of the present invention, each alternative can be arbitrarily combined with any other basic examples and alternatives. Those skilled in the art will appreciate the numerous possible combinations.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hybrid shunting locomotive control system based on four-quadrant rectification, characterized in that: The shunting locomotive control system includes at least: a power battery, a diesel generator set, a four-quadrant rectifier module, a pre-charging module, and a traction motor; The power battery is electrically connected to the traction motor via a pre-charging module; The diesel generator set is connected to the pre-charging module and the power battery respectively via the four-quadrant rectifier module, and is electrically connected to the traction motor via the pre-charging module; Powering the traction motor via the power battery and / or diesel generator set; The shunting locomotive control system further includes an industrial generator set, which is connected to the power battery and the traction motor respectively via the four-quadrant rectifier module; The shunting locomotive control system also includes a locomotive auxiliary system, The power battery is connected to the locomotive auxiliary system via the four-quadrant rectifier module to supply power to the locomotive auxiliary system; The diesel generator set and the industrial generator set are connected to the locomotive auxiliary system to supply power to the locomotive auxiliary system; The locomotive auxiliary system includes at least a traction motor ventilator and an air conditioning / domestic electricity unit; When the shunting locomotive control system is in a pure electric mode, the power battery supplies power to the traction motor, and at the same time, the power battery supplies power to the auxiliary system via the four-quadrant rectifier module; When the shunting locomotive control system is in pure electric operation, the four-quadrant rectifier module operates in inverter mode. The four-quadrant rectifier module acts as an inverter to output 380V / 50Hz AC power, which is then supplied to the auxiliary system after sinusoidal filtering. When the shunting locomotive control system is in a pure diesel operating state, the power battery is disconnected from the pre-charging module, and the diesel generator set supplies power to the traction motor via a four-quadrant rectifier module.

2. A hybrid shunting locomotive control system based on four-quadrant rectification according to claim 1, characterized in that: When the shunting locomotive control system is in a pure diesel operating state, the four-quadrant rectifier module operates in a PWM rectification mode and outputs a constant DC608V DC voltage.

3. A hybrid shunting locomotive control system based on four-quadrant rectification according to claim 1, characterized in that: When the shunting locomotive control system is in mixed working condition, When the shunting locomotive is in the low handle position, the power battery will give priority to supplying power to the traction motor. When the power battery SOC is lower than 30%, the diesel generator set will be started to supply power to the traction motor. When the diesel generator set meets the traction power demand, the remaining power will be used to charge the power battery. When the shunting locomotive is in the high handle position, the diesel generator is started, and the output of the four-quadrant rectifier module is controlled to realize the hybrid power supply of the diesel generator set and the power battery to the traction motor.

4. A hybrid shunting locomotive control system based on four-quadrant rectification according to claim 3, characterized in that: When the shunting locomotive control system is in mixed working condition and the shunting locomotive is in low handle position, The four-quadrant rectifier module operates in a PWM rectifier mode, and controls the output of a constant current to charge the power battery until the SOC of the power battery is higher than 95%, at which time the diesel generator set stops operating.

5. A hybrid shunting locomotive control system based on four-quadrant rectification as claimed in claim 3, characterized in that: When the shunting locomotive control system is in ground charging mode, the industrial generator set charges the power battery via the four-quadrant rectifier module. Furthermore, the four-quadrant rectifier module operates in a PWM rectifier mode, and the four-quadrant rectifier module controls the output of a constant current to charge the power battery.

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