Main circuit topology structure and power supply method of hybrid locomotive with constant speed generator set

Abstract

The present invention discloses a main circuit topology structure of a hybrid locomotive of a constant-speed generator set and a power supply method, which belongs to the technical field of new energy shunting locomotives. The present invention comprises a load, a power battery pack, a diesel generator set and a ground power supply. The load comprises an auxiliary system, a traction motor and a battery. The power battery pack is connected to an intermediate DC circuit. The intermediate DC circuit comprises a pre-charging circuit, a traction converter and a battery charger. The other end of the pre-charging circuit is respectively connected to the traction converter and the battery charger, and both are respectively connected to the traction motor and the battery; the present invention also comprises a four-quadrant rectifier module. One end of the four-quadrant rectifier module is connected to the intermediate DC circuit, and the other end is connected to the diesel generator set, the ground power supply and the auxiliary system, so as to meet the needs of hybrid control of the locomotive power battery and the diesel generator set.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy shunting locomotives, and in particular, relates to a main circuit topology structure and a power supply method of a hybrid power locomotive of a constant speed generator set. Background Art

[0002] Shunting locomotives are the basic power for shunting work, and their technical requirements are different from those of general locomotives for traction of trains. Since it is necessary to start traction or push train sets within a short distance, it does not require a high construction speed, but requires a certain amount of traction. Since it needs to move forward or backward frequently, it requires good lookout conditions. Since it mainly operates in stations and needs to pass through curves with a small radius, the fixed wheelbase of the locomotive is required to be small. Since it is often necessary to start and stop, the locomotive is required to be flexible in operation and have good braking performance. Since it often operates at night, the head and tail lights require good brightness; in addition, it is also required to facilitate the safe boarding and alighting of shunting personnel, etc.

[0003] Existing shunting locomotives are basically diesel-powered electric or hydraulic shunting locomotives, which are noisy, energy-intensive, difficult to inspect and maintain, and have complex circuit topology. Some new energy hybrid shunting locomotives are based on special diesel engines and main generators, which are costly, difficult to match, and have complex structures. Summary of the invention

[0004] In view of this, in order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a hybrid locomotive main circuit topology structure and power supply method of a constant speed generator set to meet the needs of hybrid control of locomotive power batteries and diesel generator sets.

[0005] The technical solution adopted by the present invention is: a main circuit topology structure of a hybrid locomotive of a constant speed generator set, including a load, a power battery pack, a diesel generator set and a ground power supply, the load includes an auxiliary system, a traction motor and a battery, the power battery pack is connected to an intermediate DC circuit, the intermediate DC circuit includes a pre-charging circuit, a traction converter and a battery charger, the other end of the pre-charging circuit is respectively connected to the traction converter and the battery charger, and the two are respectively connected to the traction motor and the battery;

[0006] It also includes a four-quadrant rectifier module, one end of which is connected to the intermediate DC circuit, and the other end is connected to the diesel generator set, the ground power supply and the auxiliary system.

[0007] Furthermore, the load is powered by a power battery pack, a diesel generator set or a ground power supply alone, or by a combination of a power battery pack and a diesel generator set, so as to switch between different working modes and thereby realize different functions.

[0008] Furthermore, the four-quadrant rectifier module includes a four-quadrant rectifier and an LCL filter circuit connected thereto, the four-quadrant rectifier is connected to the pre-charging circuit, and the LCL filter circuit is respectively connected to the diesel generator set and the ground power supply. The four-quadrant rectifier is powerful and can meet the functional requirements of different power supplies.

[0009] Furthermore, the battery is a 110V battery, and the 110V battery is connected to a 110V DC power supply interface to serve as an external 110V DC power supply.

[0010] Furthermore, the power battery pack includes at least two groups of power batteries, and each group of power batteries is connected in parallel to provide sufficient DC power through multiple groups of power batteries.

[0011] Furthermore, the diesel generator set outputs AC380V / 50Hz AC power for traction power or auxiliary system power.

[0012] Furthermore, the auxiliary system includes at least one traction motor ventilator and an air conditioning / domestic electricity port to meet the auxiliary functions of the locomotive.

[0013] The present invention also provides a power supply method for a main circuit topology structure of a hybrid locomotive of a constant speed generator set, which is applied to the main circuit topology structure of a hybrid locomotive of a constant speed generator set provided above, and the method comprises:

[0014] The power battery pack is used to supply power to the intermediate DC circuit during traction and / or to the auxiliary system through the four-quadrant rectifier module. During regenerative braking, the power battery pack is charged by the intermediate DC circuit and / or to the auxiliary system through the four-quadrant rectifier module.

[0015] Powered by a diesel generator set alone, the diesel generator set supplies power to the auxiliary system, and / or supplies power to the intermediate DC circuit through a four-quadrant rectifier module, and regenerative braking is prohibited;

[0016] It is powered by a combination of a power battery pack and a diesel generator set. The four-quadrant rectifier module works in PWM rectification mode, and the diesel generator is combined with a power battery pack for hybrid power supply.

[0017] The ground power supply is used to supply power to auxiliary systems and / or to charge the power battery pack after rectification by a four-quadrant rectifier module.

[0018] Furthermore, when the power battery pack and the diesel generator set are used as a hybrid power supply, if the locomotive is in a low handle position, the power battery pack will be used for power supply first, until the SOC of the power battery pack is lower than 30%, the diesel generator set will be started, and the diesel generator set will supply power to the intermediate DC circuit and charge the power battery pack after passing through the four-quadrant rectifier module, until the SOC of the power battery pack is higher than 95%, the diesel generator set will be stopped;

[0019] If the locomotive is in the high handle position, the diesel generator set passes through the four-quadrant rectifier module and is combined with the power battery pack to provide mixed power to the intermediate DC circuit.

[0020] The beneficial effects of the present invention are:

[0021] 1. The main circuit topology and power supply method of the hybrid locomotive using the constant speed generator set provided by the present invention utilizes the functional diversity of the four-quadrant rectifier module to simplify the main circuit topology, reduce one auxiliary inverter, and make the configuration simpler. The four-quadrant rectifier module can realize the two functions of boost rectification and inversion to meet the needs of hybrid control of the locomotive power battery and the diesel generator set. At the same time, it can act as a frequency converter to provide AC power to the auxiliary system, and can also act as a charger to charge the power battery pack. The overall circuit structure is simple and the functions are complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the main circuit topology of the hybrid locomotive of the constant speed generator set provided by the present invention. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar modules or modules with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limitations on the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0024] Example 1

[0025] like Figure 1 As shown, in this embodiment, a main circuit topology structure of a hybrid locomotive with a constant speed generator set is provided. The main function of the locomotive main circuit is to control the operation of the AC asynchronous traction motor after converting the DC power of the power battery set and the AC power of the diesel generator set, charge the power battery set, realize the locomotive braking energy feedback, and control the operation of the traction fan; at the same time, provide AC380V / 220V AC power and DC 110V DC power to the outside. The specific design is as follows:

[0026] It mainly includes auxiliary system, traction motor, battery, power battery pack, diesel generator set and ground power supply, wherein the diesel generator set is used to provide AC380V / 50Hz AC power supply; the power battery pack is used to provide DC power supply, preferably, the power battery pack includes two groups of power batteries, each group of power batteries is connected in parallel and connected to the intermediate DC circuit; the ground power supply is used to provide AC380V / 50Hz AC power supply. The auxiliary system includes at least one traction motor ventilator and an air conditioning / daily power port, in this embodiment, there are two traction motors and one air conditioning / daily power port; the battery is a 110V battery, and the 110V battery is connected to a 110V DC power supply interface to provide 110V DC power to the outside of the locomotive; the traction motor provides power for the movement of the locomotive to realize the dispatching of the locomotive.

[0027] The power battery pack is connected to an intermediate DC circuit, which includes a pre-charging circuit, a traction inverter and a battery charger. The other end of the pre-charging circuit is connected to the traction inverter and the battery charger, and the traction inverter and the battery charger are respectively connected to the traction motor and the battery. The function of the pre-charging circuit is as follows: there is an intermediate circuit capacitor on the rectifier and rectifier feedback module. If the power module is connected, the power module capacitor is also added to the DC bus. The capacitor charging current has a logarithmic curve characteristic. If the starting current is not limited, it will be very large, which can destroy the capacitor in one go. Therefore, when the SLM unit is put into operation, the timing is: first put the pre-charging power supply (connected to the main power supply) into operation, give the closing command, put the internal pre-charging contactor into operation, the power supply charges the capacitor group through the pre-charging resistor, after the voltage is reached, put the main power supply into operation, and cut off the pre-charging contactor; the pre-charging circuit generally includes two paths, one is the main relay, and the other is the auxiliary relay with larger impedance and resistor R, and the auxiliary relay and resistor R are connected in series. During the pre-charging process, the auxiliary relay and resistor R are first connected, and the capacitor group is charged through the pre-charging resistor. After the voltage is reached, the circuit where the main relay is located is put into operation, and the auxiliary relay is cut off. The above is the basic working principle, and the use of the pre-charging circuit is a prior art and will not be repeated here. The above traction inverter converts the intermediate DC power into AC power to control the action of the traction motor through space vector control. The above battery charger is used to charge the 110V battery and then power the control circuit of the locomotive.

[0028] It also includes a four-quadrant rectifier module, one end of which is connected to the intermediate DC circuit, and the other end is respectively connected to the diesel generator set, the ground power supply and the auxiliary system, that is, the diesel generator set and the ground power supply are both connected to the four-quadrant rectifier module, and the diesel generator set and the ground power supply are both connected to the auxiliary system. Among them, the four-quadrant rectifier module includes a four-quadrant rectifier and an LCL filter circuit connected thereto, the LCL filter circuit is a matching module of the four-quadrant rectifier, and plays a role in filtering and electromagnetic compatibility; the four-quadrant rectifier is connected to the pre-charging circuit, and the LCL filter circuit is respectively connected to the diesel generator set and the ground power supply.

[0029] The main circuit topology of the hybrid locomotive of the constant speed generator set provided in this embodiment is mainly divided into the following four working modes, namely: power supply by power battery pack, diesel generator set or ground power supply alone, or power supply by power battery pack and diesel generator set. In different modes, the four-quadrant rectifier module plays different roles, as follows:

[0030] When the diesel generator set is used as the sole power supply, the four-quadrant rectifier module plays the role of PWM rectification, boosting the AC power and supplying it to the intermediate DC circuit;

[0031] When the diesel generator set and the power battery set are used for mixed power supply, the four-quadrant rectifier module plays the role of PWM rectification. Through precise control, the diesel generator set and the power battery set can be mixed for output, thus increasing the output power of the locomotive and improving the traction capacity.

[0032] When the power battery pack is charged by ground power or diesel generator set, the four-quadrant rectifier module acts as a charger to control the constant current charging of the power battery pack;

[0033] When the power is supplied solely by the power battery, the four-quadrant rectifier module acts as a frequency converter, inverting the intermediate DC power and supplying it to the auxiliary system after sinusoidal wave filtering.

[0034] Example 2

[0035] Based on the circuit topology in Embodiment 1, a power supply method is also provided in this embodiment to realize different functions in various working modes of the locomotive. The method includes:

[0036] The working mode of the locomotive is switched through control commands to realize power supply by power battery pack alone, diesel generator set alone or ground power supply alone, or mixed power supply by power battery pack and diesel generator set. Different functions can be realized in different working modes. The power supply methods in each mode are as follows:

[0037] ① The load is powered by the power battery pack alone (the ground power supply and diesel generator set are not working): When the locomotive is in traction state, the power battery pack supplies power to the intermediate DC circuit, and the intermediate DC circuit supplies power to the traction converter and controls the operation of the traction motor through the traction converter. At the same time, the DC power of the power battery pack supplies power to the auxiliary system through the four-quadrant rectifier module. At this time, the four-quadrant rectifier module acts as a frequency converter, inverting the intermediate DC power and supplying it to the auxiliary system through sine wave filtering;

[0038] When the locomotive is in regenerative braking, the traction motor generates electricity and charges the power battery pack through the traction inverter. At the same time, the traction motor generates electricity to supply power to the intermediate DC circuit, which is then supplied to the auxiliary system through the four-quadrant rectifier module to meet the power consumption of the auxiliary system.

[0039] ② Powered by a diesel generator set alone (the ground power supply and the power battery pack are not working): The AC380V / 50Hz alternating current generated by the diesel generator set directly supplies power to the auxiliary system. At the same time, the AC380V / 50Hz alternating current is rectified and boosted by the four-quadrant rectifier module to supply power to the intermediate DC circuit, and then to the traction motor through the pre-charging circuit and the traction inverter. When the diesel generator set is used to supply power alone, the locomotive is prohibited from performing regenerative braking, that is, the current generated by the traction motor will not be fed back to the intermediate DC circuit.

[0040] ③ The power supply is mixed by the power battery pack and the diesel generator set. At this time, the working state of the four-quadrant rectifier module is switched to the PWM rectification mode, and the diesel generator is combined with the power battery pack for mixed power supply. The specific method is as follows:

[0041] When the power battery pack and the diesel generator set are used as a mixed power supply, if the locomotive is in the low handle position, the power battery pack will be used for power supply first, until the SOC of the power battery pack is lower than 30%, the diesel generator set will be started, and through precise control, the diesel generator set will supply power to the intermediate DC circuit and charge the power battery pack after passing through the four-quadrant rectifier module. At this time, the AC power generated by the diesel generator set can also directly power the auxiliary system; as the power battery pack is charged, the diesel generator set will be stopped until the SOC of the power battery pack is higher than 95%; at this time, the four-quadrant rectifier of the four-quadrant rectifier module is in PWM rectification mode;

[0042] If the locomotive is in the high handle position, through precise control, the diesel generator set passes through the four-quadrant rectifier module and then combines with the power battery pack to provide mixed power to the intermediate DC circuit, thereby increasing the locomotive output power and improving the traction capacity. At this time, the AC power generated by the diesel generator set can also directly power the auxiliary system, and the working state of the four-quadrant rectifier in the four-quadrant rectifier module is also in PWM rectification mode.

[0043] ④ The ground power supply is used alone, and the auxiliary system is directly powered by the ground power supply, and / or the power battery pack is charged after rectification by the four-quadrant rectifier module. The charging current is input from the display screen of the locomotive, and the charging is started. The diesel generator set is prohibited from starting and loading. The 380V / 50Hz AC power of the ground power supply is used to charge the power battery after rectification by the four-quadrant rectifier module. The four-quadrant rectifier module works in constant current mode and can accurately control the charging current of the power battery. At the same time, the ground power supply directly supplies power to the auxiliary system.

[0044] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0045] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0046] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0047] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0048] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0049] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A main circuit topology structure of a hybrid locomotive with a constant speed generator set, including a load, characterized in that: It also includes a power battery pack, a diesel generator set and a ground power supply, the load includes an auxiliary system, a traction motor and a battery, the power battery pack is connected to an intermediate DC circuit, the intermediate DC circuit includes a pre-charging circuit, a traction converter and a battery charger, the other end of the pre-charging circuit is respectively connected to the traction converter and the battery charger, and the two are respectively connected to the traction motor and the battery; It also includes a four-quadrant rectifier module, one end of which is connected to the intermediate DC circuit, and the other end is connected to the diesel generator set, the ground power supply and the auxiliary system; The load is powered by a power battery pack, a diesel generator set or a ground power supply alone, or by a combination of a power battery pack and a diesel generator set; The four-quadrant rectifier module comprises a four-quadrant rectifier and an LCL filter circuit connected thereto, the four-quadrant rectifier is connected to a pre-charging circuit, and the LCL filter circuit is respectively connected to a diesel generator set and a ground power supply.

2. The main circuit topology structure of the hybrid locomotive of the constant speed generator set according to claim 1 is characterized in that: The battery is a 110V battery, and the 110V battery is connected to a 110V direct current power supply interface.

3. The main circuit topology structure of the hybrid locomotive of the constant speed generator set according to claim 1 is characterized in that: The power battery pack includes at least two groups of power batteries, and each group of power batteries is connected in parallel.

4. The main circuit topology structure of a hybrid locomotive with a constant speed generator set according to claim 1, characterized in that: The diesel generator set outputs AC 380V / 50Hz AC power.

5. The main circuit topology structure of a hybrid locomotive with a constant speed generator set according to claim 1, characterized in that: The auxiliary system includes at least one traction motor ventilator and an air conditioning / domestic power port.

6. A power supply method for a main circuit topology structure of a hybrid locomotive with a constant speed generator set, characterized in that: The method is based on the main circuit topology of the hybrid locomotive of the constant speed generator set as claimed in any one of claims 1 to 5, and the method comprises: the power battery pack is used to supply power to the intermediate DC circuit during traction, and / or to supply power to the auxiliary system through the four-quadrant rectifier module; during regenerative braking, the intermediate DC circuit charges the power battery pack, and / or supplies power to the auxiliary system through the four-quadrant rectifier module; Powered by a diesel generator set alone, the diesel generator set supplies power to the auxiliary system, and / or supplies power to the intermediate DC circuit through a four-quadrant rectifier module, and regenerative braking is prohibited; It is powered by a combination of a power battery pack and a diesel generator set. The four-quadrant rectifier module works in PWM rectification mode, and the diesel generator is combined with a power battery pack for hybrid power supply. The ground power supply is used to supply power to auxiliary systems and / or to charge the power battery pack after rectification by a four-quadrant rectifier module.

7. The power supply method for the main circuit topology structure of a hybrid locomotive with a constant speed generator set according to claim 6, characterized in that: When the power battery and diesel generator set are used as a mixed power supply, if the locomotive is in the low handle position, the power battery set will be used for power supply first, until the SOC of the power battery set is lower than 30%, the diesel generator set will be started, and the diesel generator set will supply power to the intermediate DC circuit and charge the power battery set after passing through the four-quadrant rectifier module, until the SOC of the power battery set is higher than 95%, the diesel generator set will be stopped; If the locomotive is in the high handle position, the diesel generator set passes through the four-quadrant rectifier module and is combined with the power battery pack to provide mixed power to the intermediate DC circuit.

Images