CN119190090A - A multi-source hybrid shunting locomotive power system and management strategy - Google Patents
A multi-source hybrid shunting locomotive power system and management strategy Download PDFInfo
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- CN119190090A CN119190090A CN202411326427.0A CN202411326427A CN119190090A CN 119190090 A CN119190090 A CN 119190090A CN 202411326427 A CN202411326427 A CN 202411326427A CN 119190090 A CN119190090 A CN 119190090A
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- 230000003137 locomotive effect Effects 0.000 title claims abstract description 111
- 238000004146 energy storage Methods 0.000 claims abstract description 49
- 239000004606 Fillers/Extenders Substances 0.000 claims abstract description 37
- 238000003860 storage Methods 0.000 claims description 61
- 239000003990 capacitor Substances 0.000 claims description 50
- 230000002457 bidirectional effect Effects 0.000 claims description 29
- 238000011217 control strategy Methods 0.000 claims description 26
- 230000001172 regenerating effect Effects 0.000 claims description 21
- 230000009467 reduction Effects 0.000 claims description 9
- 230000009194 climbing Effects 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 238000007667 floating Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C7/00—Other locomotives or motor railcars characterised by the type of motive power plant used; Locomotives or motor railcars with two or more different kinds or types of motive power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/40—Electric propulsion with power supplied within the vehicle using propulsion power supplied by capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
- B60L50/62—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles charged by low-power generators primarily intended to support the batteries, e.g. range extenders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
本申请提供了一种多源混合的调车机车动力系统及管理策略，其中，方法包括与调车机车牵引变流器电连接的储能系统，储能系统通过牵引变流器为与牵引变流器连接的牵引电机和辅助系统供电，实现牵引电机控制轮对；储能系统包括蓄电池组和DC/DC变换器；还包括为储能系统充电的增程器，当储能系统的剩余电量低于预设值时，启动增程器为储能系统充电。本申请通过增程器为储能系统充电使得调车机车能够适应多种不同环境和工况，便于改造和制造的多源动力调车机车动力系统，能效比高，且相比纯油动力系统，减少了柴油机因需要怠速运转，频繁处于交变负荷中导致废气的大量产生，且本系统维护成本低。
The present application provides a multi-source hybrid shunting locomotive power system and management strategy, wherein the method includes an energy storage system electrically connected to the traction inverter of the shunting locomotive, the energy storage system supplies power to the traction motor and auxiliary system connected to the traction inverter through the traction inverter, so as to realize the traction motor controlling the wheelset; the energy storage system includes a battery pack and a DC/DC converter; and also includes a range extender for charging the energy storage system, and when the remaining power of the energy storage system is lower than a preset value, the range extender is started to charge the energy storage system. The present application charges the energy storage system through a range extender so that the shunting locomotive can adapt to a variety of different environments and working conditions, and the multi-source power shunting locomotive power system that is easy to transform and manufacture has a high energy efficiency ratio, and compared with a pure oil power system, it reduces the large amount of exhaust gas generated by the diesel engine due to the need to idle and frequently being in alternating loads, and the maintenance cost of this system is low.
Description
Technical Field
The invention relates to the technical field of shunting locomotive power systems, in particular to a multisource hybrid shunting locomotive power system and a management strategy.
Background
Because of the requirements of new generation of electric power, hybrid power, new energy and multi-source locomotives, the existing internal combustion shunting locomotives have larger defects, because of working models of diesel engine power generation, preheating, heat preservation, waiting and the like, the diesel engine needs idling operation, so that the idling time of the diesel engine is longer, the efficiency is low, and the diesel engine is frequently in alternating load, and the oil consumption is higher and the combustion is insufficient. Therefore, new energy transformation of the internal combustion shunting locomotive and design and manufacture of the new energy shunting locomotive are the problems to be solved or optimized at present.
The design of the shunting locomotive power system is an important problem to be solved in the research of the multi-source power shunting locomotive, the power system is a core system of the shunting locomotive, the capacity of the shunting locomotive for executing various tasks is determined, and the shunting locomotive with the excellent power system has the advantages of high energy efficiency ratio, low running noise and low exhaust emission. The shunting locomotive power system mainly comprises an internal combustion engine power system, a pure electric power system, a hybrid power system and the like. The conventional internal combustion engine power system needs to be updated, but the pure electric power system has higher cost and poorer low-temperature environment adaptability, so that the problem is solved by continuously providing a hybrid power system which is a shunting locomotive power system.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a multi-source hybrid shunting locomotive power system and a management strategy, so as to solve the technical problems in the above-mentioned technologies.
One or more embodiments of the present specification provide a multi-source hybrid shunting locomotive power system comprising:
The energy storage system is electrically connected with the traction converter of the shunting locomotive, and supplies power to a traction motor and an auxiliary system connected with the traction converter through the traction converter so as to realize a traction motor control wheel set, and comprises a storage battery pack and a DC/DC converter, and
The range extender is used for charging the energy storage system, and when the residual electric quantity of the energy storage system is lower than a preset value, the range extender is started to charge the energy storage system.
Further, the range extender comprises a diesel generator and a three-phase PWM rectifying module, the three-phase PWM rectifying module outputs direct-current electric energy and is connected with the storage battery, and the output power of the range extender is greater than 100% of the power requirement of the operation working condition of the traction motor of the shunting locomotive.
Furthermore, the energy storage system is further provided with a super capacitor, the super capacitor is connected with the traction converter through the DC/DC converter, when the shunting locomotive is under a large traction working condition, the super capacitor and the storage battery pack supply power for the traction converter simultaneously, and the super capacitor is used as a direct current side bus capacitor of the traction converter and used for adjusting the direct current side voltage of the traction converter. .
Furthermore, the traction converter is a four-quadrant converter, the DC/DC converter is a bidirectional DC/DC converter, when the shunting locomotive is in a braking working condition, the traction converter enters a rectification mode, and after the regenerative braking energy is subjected to step-down and rectification, the regenerative braking energy is recovered to the super capacitor or the storage battery after being subjected to step-down treatment by the bidirectional DC/DC converter.
Furthermore, under the braking working condition, the traction converter reduces and rectifies regenerated braking energy, then the regenerated braking energy is reduced in pressure and then is conveyed to the super capacitor for storage after being subjected to pressure reduction treatment by the bidirectional DC/DC converter, when the voltage of the super capacitor is detected to be larger than a preset voltage value, the bidirectional DC/DC converter changes by means of current, and the bidirectional DC/DC converter switches to convey energy to the storage battery pack for charging under the condition that the voltage polarity is unchanged.
One or more embodiments of the present disclosure provide a control strategy for a multi-source hybrid shunting locomotive power system, which is based on any one of the above multi-source hybrid shunting locomotive power systems, and includes a control strategy corresponding to a traction condition and an idle condition:
Under traction working conditions, the control unit controls the storage battery to output energy through the DC/DC converter, the traction motor is driven by the traction converter and supplies power to loads in the auxiliary system respectively, when the SOC of the storage battery is detected to be lower than a preset value, the control unit controls the range extender to charge the storage battery, and if the shunting locomotive is in an operation state, the range extender is switched to provide energy for the power system;
under the idle working condition, the energy storage system stops outputting electric energy, the shunting locomotive runs forward by means of self inertia and slowly decelerates, and the storage battery pack outputs energy through the DC/DC converter and only supplies power for the auxiliary system through the traction converter.
Further, the method also comprises a corresponding control strategy under the braking working condition, specifically:
When the shunting locomotive runs down a slope or is in a braking working condition, the system enters a regenerative braking working condition, the traction motor absorbs regenerative braking energy generated by the wheel set, the regenerative braking energy is subjected to voltage reduction and rectification through the traction converter to obtain stable direct-current voltage, the direct-current voltage is subjected to voltage reduction treatment through the bidirectional DC/DC converter and is input into a super capacitor group of the super capacitor energy storage device for storage, and when the voltage of the super capacitor is detected to be larger than a preset voltage value, the bidirectional DC/DC converter changes depending on current, and energy is switched to be transmitted to the storage battery group for charging under the condition that the voltage polarity is unchanged.
Further, the method also comprises a corresponding control strategy under a high-power traction working condition, and specifically comprises the following steps:
when the shunting locomotive is in high-power traction due to heavy load or climbing, the bidirectional DC/DC converter is in a boosting mode, the control unit controls the storage battery pack and the super capacitor to jointly output energy through the bidirectional DC/DC converter, and the energy jointly output by the storage battery pack and the super capacitor is respectively supplied to the traction motor and a load in an auxiliary system through the traction converter.
Further, the control strategy of the starting working condition is also included, namely when the shunting machine is in a starting mode, the storage battery pack charges the super capacitor through the DC/DC converter.
Further, the control strategy of the charging working condition is also included, when the SOC of the storage battery pack is lower than a preset value, the in-situ power generation mode can be started manually, and the range extender charges the storage battery pack.
The multi-source mixed shunting locomotive power system and the management strategy have the advantages that the multi-source mixed shunting locomotive power system provided with the range extender and the energy storage system is compared with a pure electric system, the range extender charges the energy storage system to enable the shunting locomotive to adapt to various different environments and working conditions, the multi-source power shunting locomotive power system convenient to reform and manufacture is high in energy efficiency ratio, compared with a pure oil power system, the diesel engine is reduced to be in idle running due to the need of the idle running, a large amount of waste gas is frequently caused in alternating load, the system maintenance cost is low, and the system can provide guiding advice for new energy reformation of the internal combustion shunting locomotive and design of the new energy shunting locomotive, so that the novel shunting locomotive power system is more reliable and has basis.
Drawings
In order to more clearly illustrate one or more embodiments of the present specification or the prior art solutions, the following description will briefly introduce the drawings that are required to be used in the embodiments or the prior art descriptions, it is obvious that the drawings in the following description are only some embodiments described in the present specification, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a multi-source hybrid shunting locomotive power system according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a shunting locomotive energy flow in extended range mode according to one or more embodiments of the present disclosure;
FIG. 3 is a schematic diagram of a shunting locomotive energy flow under high power traction conditions according to one or more embodiments of the present disclosure;
FIG. 4 is a schematic diagram of a shunting locomotive energy flow under a start-up condition according to one or more embodiments of the present disclosure;
FIG. 5 is a schematic diagram of a shunting locomotive energy flow during braking conditions according to one or more embodiments of the present disclosure, an
FIG. 6 is a schematic diagram of a shunting locomotive energy flow under idle conditions provided by one or more embodiments of the present disclosure.
Detailed Description
In order to enable a person skilled in the art to better understand the technical solutions in one or more embodiments of the present specification, the technical solutions in one or more embodiments of the present specification will be clearly and completely described below with reference to the drawings in one or more embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present specification, not all embodiments. All other embodiments, which can be made by one or more embodiments of the present disclosure without inventive faculty, are intended to be within the scope of the present invention.
The invention is described in detail below with reference to the detailed description and the accompanying drawings.
System embodiment
According to an embodiment of the present invention, as shown in fig. 1, a power system of a multi-source mixed shunting locomotive is provided, which is a schematic structural diagram of the power system of the multi-source mixed shunting locomotive provided in the embodiment, and the power system of the multi-source mixed shunting locomotive according to the embodiment of the present invention includes:
The energy storage system is electrically connected with the traction converter of the shunting locomotive, and supplies power to a traction motor and an auxiliary system connected with the traction converter through the traction converter, so that a traction motor control wheel set is realized.
The system further comprises a range extender for charging the energy storage system, and referring to fig. 2, when the residual electric quantity (SOC) of the energy storage system is lower than a preset value, the range extender is started to Charge the energy storage system, and if the shunting locomotive is in an operating State, the range extender is switched to provide energy for the power system;
In this embodiment, the range extender charges the energy storage system, when the remaining power of the energy storage system is lower than a preset value, the range extender generates electricity to provide energy for the power system, and charges the energy storage system at the same time, and the storage battery pack cannot be charged and discharged at the same time in most cases, so that the energy storage system can be regarded as an intermediate link.
In this embodiment, the energy storage system includes a battery pack and a bi-directional DC/DC converter.
In this embodiment, the range extender includes a diesel generator and a three-phase PWM rectifying module, where the three-phase PWM rectifying module outputs dc power and is connected to the battery pack.
In this embodiment, the output power of the range extender is greater than 100% of the power requirement of the conventional traction motor of the shunting locomotive.
In this embodiment, the shunting locomotive power system is a range-extending hybrid power system or a series hybrid power system, for example, the series hybrid power system, that is, the diesel range extender, the energy storage system and the traction motor, belong to a series form.
Compared with a pure electric system, the multi-source hybrid shunting locomotive power system provided by the embodiment is capable of charging the energy storage system through the range extender so that the shunting locomotive can adapt to various different environments and working conditions, is convenient to reform and manufacture, has high energy efficiency ratio, reduces a large amount of waste gas generated by frequent alternating load of a diesel engine due to idle running compared with a pure oil power system, and is low in maintenance cost.
According to the embodiment, the fact that the storage battery has larger energy density when the shunting locomotive is started or under heavy load working conditions is considered, the service life and efficiency of the storage battery are adversely affected by heavy current discharge, therefore, the energy storage system is further provided with the super capacitor, the super capacitor is connected with the traction converter through the bidirectional DC/DC converter, as shown in fig. 3, the shunting locomotive is powered for the traction converter through the super capacitor and the storage battery under the large traction working conditions such as climbing or heavy load, meanwhile the super capacitor is used as a direct current side bus capacitor of the traction converter and is used for adjusting direct current side voltage of the traction converter, when the super capacitor and the storage battery are powered for the traction converter at the same time, the storage battery is mainly powered by the storage battery, the super capacitor is responsible for filling the residual power required part which cannot be supplied by the storage battery, when the shunting locomotive enters into a regenerative braking working condition, the traction motor absorbs regenerative braking energy generated by a wheel pair of the shunting locomotive and works in a generator mode, stable direct current voltage is obtained after the traction converter is reduced and rectified, the super capacitor is charged and the auxiliary system is charged when the shunting locomotive is started, as shown in fig. 4, and the storage battery is charged for the shunting locomotive through the DC converter.
In the embodiment, preferably, when the residual electric quantity of the energy storage system is lower than a preset value and the shunting locomotive is under a low-power traction working condition, the super capacitor is switched to supply power to the traction converter and the range extender charges only the energy storage system, and when the shunting locomotive is under a high-power traction working condition and the SOC of the storage battery is lower than a certain value, the range extender is started to supply power to the storage battery, and simultaneously the range extender and the super capacitor supply power to the traction converter.
In this embodiment, the traction converter is a four-quadrant converter, and when the shunting locomotive is in a braking working condition, the traction converter may work in a rectifying mode, and regenerative braking energy is recovered to the super capacitor or the storage battery.
In this embodiment, the bidirectional DC/DC converter includes two working modes according to the working condition of the shunting locomotive, specifically, when the shunting locomotive enters a regenerative braking working condition, for example, the shunting locomotive is in a downhill or braking state, the bidirectional DC/DC converter is in a buck mode, and when the shunting locomotive performs high-power traction, for example, the shunting locomotive starts or goes uphill, the bidirectional DC/DC converter is in a boost mode.
In a preferred embodiment, as shown in fig. 5, according to the working mode of the bidirectional DC/DC converter, under the regenerative braking working condition, the regenerative braking energy is reduced and rectified by the traction converter to obtain a stable direct current voltage, then the direct current voltage is reduced by the bidirectional DC/DC converter, and finally the reduced energy is input into the super capacitor group of the super capacitor energy storage device for storage, and when the voltage of the super capacitor is greater than a preset voltage value, the current is changed by the bidirectional DC/DC converter, and the storage battery group is switched to charge under the condition that the voltage polarity is unchanged. Therefore, the energy storage system provides power for the shunting locomotive when the shunting locomotive is in a traction stage, braking energy is fed back to the energy storage system when the shunting locomotive is in a braking stage, and a series of problems caused by voltage floating rise are avoided.
In this embodiment, when the shunting locomotive is stopped in place but the SOC of the storage battery pack is low, the in-place power generation mode may be manually started by the driver, and the range extender charges the storage battery pack;
And the heat management system is used for heating the storage battery pack through the waste heat of the range extender when the shunting locomotive operates under the low-temperature condition, so that the storage battery pack is in a good working state.
In the multi-source mixed shunting locomotive power system provided by the embodiment, in the shunting locomotive running process, under normal working conditions, the power output of the storage battery pack is regulated through the DC/DC converter and is used for supplying power to devices such as the traction converter, when the SOC of the storage battery pack is lower than a preset value, the control system starts the range extender to charge the energy storage system, the diesel internal combustion engine keeps the output power constant, charges the storage battery pack until the SOC of the storage battery pack reaches the preset value, and the control system is always in a high-efficiency running state, so that the energy waste caused by insufficient diesel combustion can be reduced. When the power system enters a regenerative braking working condition, a traction motor absorbs regenerative braking energy generated by a locomotive wheel pair and works in a generator mode, stable direct-current voltage is obtained after voltage reduction and rectification through the traction converter, and the super capacitor is charged and supplied with power for an auxiliary system.
Control strategy embodiment
According to the embodiment of the invention, a control strategy of a multi-source mixed shunting locomotive power system is provided, based on the multi-source mixed shunting locomotive power system, different control strategies are executed to supply power for a shunting locomotive according to different working conditions, and the control strategy corresponding to traction working conditions and idle working conditions is specifically as follows:
When the shunting locomotive is in traction, the bidirectional DC/DC converter is in a boosting mode, the control unit controls the energy storage system to output energy through the DC/DC converter, the traction motor is driven by the traction converter and power is supplied to loads in the auxiliary system respectively, when the SOC of the energy storage system is detected to be lower than a preset value, as shown in fig. 2, the control unit controls the range extender to charge the energy storage system, and if the shunting locomotive is in an operating state, the range extender is switched to supply energy for the power system.
The corresponding control strategy under the idle working condition is specifically as follows:
when the shunting locomotive reaches the highest speed or the highest speed limit, the power system enters an idle working condition, as shown in fig. 6, the energy storage system stops outputting electric energy, the shunting locomotive runs forward by self inertia and slowly decelerates, the storage battery pack outputs energy through the DC/DC converter, and only the auxiliary system is powered through the traction converter.
According to the embodiment, the range extender is used for charging the energy storage system, so that the shunting locomotive can adapt to various different environments, the energy efficiency ratio of the multi-source power shunting locomotive power system which is convenient to reform and manufacture is high, compared with a pure oil power system, the idling operation of a diesel engine is reduced, a large amount of waste gas is generated due to frequent alternating load, the maintenance cost of the system is low, and the system is always in a high-efficiency running state.
In this embodiment, the method further includes a corresponding control strategy under the charging condition, the high-power traction condition and the braking condition.
The specific control strategy under the starting condition is that when the shunting locomotive is started, the storage battery pack charges the super capacitor through the DC/DC converter so as to prepare for starting operation of the shunting locomotive.
The specific control strategy of the high-power traction working condition is that when the shunting locomotive is in high-power traction due to heavy load or climbing, as shown in fig. 3, the bidirectional DC/DC converter is in a boosting mode, the control unit controls the storage battery and the super capacitor to jointly output energy through the DC/DC converter, the energy jointly output by the storage battery and the super capacitor respectively supplies power to the traction motor and loads in an auxiliary system through the traction converter, and the energy output by the super capacitor is used for supplementing part of power which cannot be born by the storage battery.
The corresponding control strategy under the braking working condition is that when the shunting locomotive descends or is in the braking working condition, the system enters a regenerative braking working condition, as shown in fig. 5, the traction motor absorbs regenerative braking energy generated by a wheel set, the regenerative braking energy is subjected to voltage reduction and rectification through the traction converter to obtain stable direct-current voltage, then the direct-current voltage is subjected to voltage reduction treatment through the bidirectional DC/DC converter, finally the energy subjected to the voltage reduction treatment is input into a super capacitor group of the super capacitor energy storage device for storage, and when the voltage of the super capacitor is larger than a preset voltage value, the current is changed through the bidirectional DC/DC converter, and the storage battery is switched to charge under the condition that the voltage polarity is unchanged. Therefore, when the shunting locomotive is in a traction stage, the energy storage system supplies power to the shunting locomotive, and when the shunting locomotive is in a braking stage, braking energy is fed back to the energy storage system, so that a series of problems caused by voltage floating rise are avoided, the control strategy is simple, and the stability is high.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, with reference to the description of method embodiments in part. The apparatus and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and that the modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention, and those not described in detail in the present specification will be known to those skilled in the art.
Claims (10)
1. A multi-source hybrid shunting locomotive power system, comprising:
The energy storage system is electrically connected with the traction converter of the shunting locomotive, and supplies power to a traction motor and an auxiliary system connected with the traction converter through the traction converter so as to realize a traction motor control wheel set, and comprises a storage battery pack and a DC/DC converter, and
The range extender is used for charging the energy storage system, and when the residual electric quantity of the energy storage system is lower than a preset value, the range extender is started to charge the energy storage system.
2. The multi-source hybrid shunting locomotive power system according to claim 1, wherein the range extender comprises a diesel generator and a three-phase PWM rectifying module, the three-phase PWM rectifying module outputs direct current electric energy and is connected with a storage battery, and the output power of the range extender is greater than 100% of the power requirement of the operating condition of a traction motor of the shunting locomotive.
3. The multi-source hybrid shunting locomotive power system according to claim 1, wherein the energy storage system is further provided with a super capacitor, the super capacitor is connected with the traction converter through a DC/DC converter, when the shunting locomotive is under a large traction working condition, the super capacitor and the storage battery pack supply power to the traction converter at the same time, and the super capacitor is used as a direct-current side bus capacitor of the traction converter for adjusting the direct-current side voltage of the traction converter.
4. The multi-source hybrid shunting locomotive power system of claim 1, wherein the traction converter is a four-quadrant converter, the DC/DC converter is a bidirectional DC/DC converter, and when the shunting locomotive is in a braking working condition, the traction converter enters a rectification mode, and after the regenerative braking energy is reduced and rectified, the regenerative braking energy is reduced through the bidirectional DC/DC converter and then recycled to a super capacitor or a storage battery pack.
5. The multi-source hybrid shunting locomotive power system of claim 4, wherein under the braking condition, the traction converter steps down and rectifies regenerated braking energy, and then carries out step-down treatment through the bidirectional DC/DC converter to the super capacitor for storage, when the voltage of the super capacitor is detected to be greater than a preset voltage value, the bidirectional DC/DC converter changes by means of current, and under the condition that the voltage polarity is unchanged, the bidirectional DC/DC converter switches to deliver energy to the storage battery for charging.
6. A control strategy of a multi-source hybrid shunting locomotive power system, characterized in that the multi-source hybrid shunting locomotive power system according to any of claims 1-5 comprises a traction condition and idle condition corresponding control strategy:
Under traction working conditions, the control unit controls the storage battery to output energy through the DC/DC converter, the traction motor is driven by the traction converter and supplies power to loads in the auxiliary system respectively, when the SOC of the storage battery is detected to be lower than a preset value, the control unit controls the range extender to charge the storage battery, and if the shunting locomotive is in an operation state, the range extender is switched to provide energy for the power system;
under the idle working condition, the energy storage system stops outputting electric energy, the shunting locomotive runs forward by means of self inertia and slowly decelerates, and the storage battery pack outputs energy through the DC/DC converter and only supplies power for the auxiliary system through the traction converter.
7. The control strategy for a multi-source hybrid shunting locomotive power system according to claim 6, further comprising a corresponding control strategy under braking conditions, specifically:
When the shunting locomotive runs down a slope or is in a braking working condition, the system enters a regenerative braking working condition, the traction motor absorbs regenerative braking energy generated by the wheel set, the regenerative braking energy is subjected to voltage reduction and rectification through the traction converter to obtain stable direct-current voltage, the direct-current voltage is subjected to voltage reduction treatment through the bidirectional DC/DC converter and is input into a super capacitor group of the super capacitor energy storage device for storage, and when the voltage of the super capacitor is detected to be larger than a preset voltage value, the bidirectional DC/DC converter changes depending on current, and energy is switched to be transmitted to the storage battery group for charging under the condition that the voltage polarity is unchanged.
8. The control strategy of a multi-source hybrid shunting locomotive power system according to claim 6, further comprising a corresponding control strategy under high-power traction conditions, specifically:
when the shunting locomotive is in high-power traction due to heavy load or climbing, the bidirectional DC/DC converter is in a boosting mode, the control unit controls the storage battery pack and the super capacitor to jointly output energy through the bidirectional DC/DC converter, and the energy jointly output by the storage battery pack and the super capacitor is respectively supplied to the traction motor and a load in an auxiliary system through the traction converter.
9. The control strategy of the multi-source hybrid shunting locomotive power system according to claim 7, further comprising a control strategy of a start-up condition, namely, when the shunting locomotive is in a start-up mode, a storage battery pack charges the super capacitor through the DC/DC converter.
10. The control strategy for a multi-source hybrid shunting locomotive power system according to claim 6 further comprising a control strategy for charging conditions wherein the in-situ power generation mode is manually enabled when the battery pack SOC is below a predetermined value and the battery pack is charged by the range extender.
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