CN103153683A - Braking energy management system and control method thereof - Google Patents

Braking energy management system and control method thereof Download PDF

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Publication number
CN103153683A
CN103153683A CN2010800654617A CN201080065461A CN103153683A CN 103153683 A CN103153683 A CN 103153683A CN 2010800654617 A CN2010800654617 A CN 2010800654617A CN 201080065461 A CN201080065461 A CN 201080065461A CN 103153683 A CN103153683 A CN 103153683A
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China
Prior art keywords
energy
bus
braking
electric power
electric
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CN2010800654617A
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Chinese (zh)
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CN103153683B (en
Inventor
吴祥明
齐智平
史黎明
韦统振
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Tongji University
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Shanghai Maglev Transportation Engineering R&D Center
Max Boegl Bauunternehmung GmbH and Co KG
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Priority to PCT/CN2010/071039 priority Critical patent/WO2011113191A1/en
Publication of CN103153683A publication Critical patent/CN103153683A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L1/00Supplying electric power to auxiliary equipment of vehicles
    • B60L1/14Supplying electric power to auxiliary equipment of vehicles to electric lighting circuits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L7/00Electrodynamic brake systems for vehicles in general
    • B60L7/10Dynamic electric regenerative braking
    • B60L7/14Dynamic electric regenerative braking for vehicles propelled by ac motors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L9/00Electric propulsion with power supply external to the vehicle
    • B60L9/16Electric propulsion with power supply external to the vehicle using ac induction motors
    • B60L9/24Electric propulsion with power supply external to the vehicle using ac induction motors fed from ac supply lines
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A braking energy management system and a control method thereof are used to manage and utilize the braking energy of a large dynamic system. The braking energy is managed in a sequence of being fed back to an AC system bus (80) of the dynamic system, being stored into an electric energy storage device (42), and being led into an energy consumption device (43) to be consumed. There are non-hauling loads such as lighting or the like and hauling loads for hauling another large dynamic system on the AC system bus. The braking energy that can't be consumed on the AC system bus is stored into the electric energy storage device or further consumed in the energy consumption device by detection of a voltage signal and/or a current signal of the AC system bus, thereby avoiding the braking energy to be fed back to the upper power grid is achieved. The energy stored in the electric energy storage device can be released in time of need.

Description

Braking energy management system and its control method
Braking energy management system and its control method technical field
The present invention relates to the management of high-speed train braking energy, Application way, more particularly, to the braking energy management system and its control method of a kind of magnetic-levitation train.Background technology
The braking energy feedback produced in electric train braking procedure causes busbar voltage to raise to the dc bus of power supply unit.
In order to which busbar voltage is limited in safe and reliable scope, it is necessary to shift the excess energy on bus in time.Usually, there is the scheme of following several transfer energy:
At present, in the transmission systems such as track traffic, elevator and milling train, excess energy is consumed in the form of heat by braking resistor mostly.Simple using the system architecture of this scheme constructses, cost is low, but can cause the waste of a large amount of electric energy.
It is gradually ripe with parallel network reverse technology, can be by combining inverter by unnecessary braking energy feedback to power network.Application and the product of correlation are occurred in that in track traffic and elevator at present.The shortcoming of this scheme is to inject dash current harmonic to power network, causes the power network quality of power supply to decline.
In recent years, employed in some subway systems by the use of the ultracapacitor for being connected on dc bus side and unnecessary braking energy, and the method for discharging these energy when launch train accelerates to provide portion of energy are stored as energy storage device.Propose a kind of circuit and control method regenerating braking energy being recovered in ultracapacitor in the patent application WO2007134674A1 of Siemens Company.The system is equipped with ultracapacitor ON TRAINS, and the ultracapacitor absorbs the braking energy of train, the energy for needed for train in the offer of midway accelerator.After train enters the station, the charging device at station according to the size of ultracapacitor dump energy decide whether to charging.The patent CN101 100170A of HIT, United States Patent (USP) US20080000381, US4523059 it is also proposed similar scheme.But some energy storage devices, such as Ni-MH battery, the charge/discharge rates of energy accumulation device for fly wheel are excessively slow, it is impossible to meet the requirement of high-speed maglev train braking energy storage.Importantly, the finite energy that the energy storage device including ultracapacitor is stored at present, it is impossible to meet the storage of substantial amounts of braking energy.
There is also the technology that some combine such scheme.Such as United States Patent (USP) US 20060005738A1 propose a kind of vehicle-mounted energy-storage system, for absorption and regeneration braking energy.The system is mainly used in electric locomotive, absorbs braking energy, and provide energy for train acceleration.The energy-storage system can also receive filling for extra power Electricity.Braking resistor is equipped with train to consume the energy that energy storage device can not absorb.But have substantial amounts of energy after all and unnecessarily consumed.Chinese patent CN101249802 proposes the urban rail traffic vehicle braking energy recovery system using ultracapacitor energy storage, and the wherein energy of ultracapacitor provides electric power by subordinate inverter, for Smaller loads such as in-car ventilation, illuminations.But the inversion scheme of the program and big load can not be promoted the use of.
On the whole, when the braking energy more than its capacity occurs, the energy storage device of above-mentioned technology does not possess by dc bus to ac bus feedback and effectively controls function to public exchange power network feedback, can only be fallen by the resistance consumption on dc bus.
High-speed maglev train produces huge braking energy in braking procedure, and due to lacking suitable energy transfer scheme, these braking energies are braked chopper and in braking resistor, cause the waste of big energy with consumption in the form of heat energy.These problems are also existed in the motor driven systems of the frequent acceleration and deceleration such as track traffic, steel rolling, elevator.The content of the invention
The present invention proposes a kind of management system and control method of effective utilization braking energy, to reduce the waste of energy.
One aspect of the present invention proposes a kind of braking energy management system, it is contained in a trailer system, the trailer system includes electric power system bus, the traction electric machine for drawing a dynamical system and converts the electric power signal of the electric power system bus to be adapted to the converter device that the traction electric machine is used, and the braking energy management system includes energy back feed device, apparatus for storing electrical energy, energy-dissipating device and control device.Energy back feed device connects converter device and electric power system bus, when energy back feed device is activated, and braking energy is obtained and to braking energy described in electric power system bus feedback from converter device.Apparatus for storing electrical energy, one of the converter device and the electric power system bus are connected by the first controllable electric energy conducting path.Energy-dissipating device connects the converter device by the second controllable electric energy conducting path.Control device, to perform following operation:When detecting dynamical system braking, start energy back feed device first, braking energy is directed into the electric power system bus;
When the energy requirement for detecting traction load on the electric power system bus and/or non-traction load is less than braking energy, the first electric energy conducting path is opened with by energy storage to the apparatus for storing electrical energy;And when detecting apparatus for storing electrical energy and being filled with electric energy, open the second electric energy conducting path energy is imported into energy-dissipating device consumption.
In one embodiment of this invention, energy back feed device can be configured independently of converter device.In this example In, energy back feed device can be inverter.In another embodiment, energy back feed device can be integrated with converter device, enable converter device that braking energy oppositely to be transformed to be adapted for the electric power signal of electric system bus.
In one embodiment of this invention, braking energy management system may also include a connection protection device, its response control apparatus and open or close the first electric energy conducting path, apparatus for storing electrical energy is carried out charge or discharge.
In one embodiment of this invention, braking energy management system may also include a braking chopping device, its response control apparatus and open or close the second electric energy conducting path, to control whether energy imports energy-dissipating device.
In one embodiment of this invention, control device can need to open the first electric energy conducting path to any time that traction electric machine provides energy, to discharge the energy of apparatus for storing electrical energy.
In one embodiment of this invention, apparatus for storing electrical energy may include at least one of battery, ultracapacitor, flywheel energy storage, superconduction inductive energy storage, flow battery, compressed-air energy storage.
In one embodiment of this invention, converter device may include inverter, rectifier and the dc bus between inverter and rectifier, and wherein rectifier is the conventional rectifiers for only carrying out rectification.In another embodiment, rectifier can be optimized for that the four-quadrant rectifier of rectification and inversion can be carried out, so that converter device obtains bi-directional electric power feeding ability.
In one embodiment of this invention, rectifier can be uncontrollable rectifier device, half-control rectifier, full-controlled rectifier device or its combination.
In one embodiment of this invention, inverter can be two level, three level or many level topological structures.
Another aspect of the present invention proposes a kind of braking energy management method, applied to a trailer system, the trailer system includes electric power system bus, the traction electric machine for drawing a dynamical system and converts the electric power signal of the electric power system bus to be adapted to the converter device that the traction electric machine is used, and this method comprises the following steps:When detecting dynamical system braking, the braking energy for being obtained the converter device from traction electric machine using an energy back feed device is preferential to the electric power system bus feedback, thinks that non-traction load and/or traction load on the electric power system bus are powered;When the energy requirement for detecting traction load on the electric power system bus and/or non-traction load is less than braking energy, braking energy is stored into an apparatus for storing electrical energy;And when detecting apparatus for storing electrical energy and being filled with electric energy, braking energy is imported into energy-dissipating device consumption.
Whether traction load and/or the energy requirement of non-traction load in one embodiment of this invention, on detection electric power system bus, which is less than braking energy, includes detecting whether the voltage on the electric power system bus is more than a voltage threshold. In one embodiment of this invention, for the non-traction load and/or traction load on the electric power system bus power including:Powered with the predetermined power corresponding to the non-traction load on the electric power system bus;And when detect there is another dynamical system on the electric power system bus and drawn when, the energy back feed device is continued to the electric power system bussed supply.
In one embodiment of this invention, detect apparatus for storing electrical energy and be filled with whether electric energy is more than a voltage threshold including the DC bus-bar voltage in detection converter device.
In one embodiment of this invention, the power of the energy of release apparatus for storing electrical energy is according to predetermined curve progress.
Another aspect of the present invention proposes a kind of braking energy management method, applied to a trailer system, the trailer system is comprising electric power system bus, multiple traction electric machines for drawing multiple dynamical systems and converts the electric power signal of the electric power system bus to be adapted to multiple converter devices that each traction electric machine is used, and this method comprises the following steps:When any dynamical system in multiple dynamical systems is braked, the braking energy for being obtained the converter device from traction electric machine using an energy back feed device is preferential to the electric power system bus feedback;When the energy requirement for detecting traction load on the electric power system bus and/or non-traction load is less than braking energy, braking energy is stored into an apparatus for storing electrical energy;And when detecting apparatus for storing electrical energy and being filled with electric energy, braking energy is imported into energy-dissipating device consumption.
Dynamical system in the present invention is not limited in high-speed maglev train, but can be widely used for the systems such as other track traffics, steel rolling, elevator.
Above-mentioned general description of the present invention and following embodiment are not construed as restricted.In addition, may also provide feature or conversion in addition to content set forth herein.The embodiment for example described in a specific embodiment can relate to manifold combination and sub-portfolio.Summary of drawings
Feature, the performance of the present invention is further described by following embodiment and its accompanying drawing.
Fig. 1 is the system block diagram of one embodiment of the invention;
Fig. 2 is the energy management flow chart of the embodiment of the present invention;
Fig. 3 (a) is energy stores-release control flow of the apparatus for storing electrical energy in Fig. 1;
Fig. 3 (b) is being released energy control flow to braking resistor in Fig. 1;
Fig. 4 is the connection diagram of the apparatus for storing electrical energy in Fig. 1 and current transformer dc bus;
Fig. 5 is schematic diagram of the braking energy of depiction 1 using management; Fig. 6 is a kind of mode of access current transformer direct current bus device according to the present invention;
Fig. 7 is the mode of another access current transformer direct current bus device according to the present invention;
Fig. 8 is one embodiment that current transformer Converting Unit is three-level inverter in the present invention;
Fig. 9 is another embodiment that current transformer Converting Unit is three-level inverter in the present invention;Figure 10 is one embodiment that current transformer Converting Unit is two-level inverter in the present invention;
Figure 11 is one embodiment that the energy storage device in the present invention is connected with ac bus;
Figure 12 is one embodiment that current transformer rectifying part is uncontrollable rectifier in the present invention;
Figure 13 is one embodiment that current transformer rectifying part is half control rectification in the present invention;
Figure 14 is one embodiment that current transformer rectifying part is full-controlled rectifier in the present invention.The preferred forms of the present invention
Fig. 1 shows the system block diagram of one embodiment of the invention.In environment shown in Fig. 1, by three-phase alternating current system bus 80 to each energy converter, for example, powered for the traction convertor device 70 of a train 50 and another train 50a another traction convertor device 70a.In the present embodiment, tractor-trailer train 50a relevant workload demand is referred to as traction load.The supply network that the train of two or more than two is made up of three-phase alternating current system bus 80 is connected, and can share the electric energy provided by supply network.Three-phase alternating current system bus 80 can also power to the indirect non-traction load 30 for tractor-trailer train such as relatively small power, illumination.It is understood that the present invention is not limited to environment as shown in Figure 1, but it can be widely used for the systems such as other track traffics, steel rolling, elevator.
Higher level's power network 100, can be to three-phase alternating current system bus after the conversion of three-phase alternating current main transformer 90
80 provide electric energy.The converter device 70 for including rectifier 71, intermediate dc bus 72 and inverter 73 can be set between three-phase alternating current system bus 80 and train 50.In an embodiment of the present invention, electric energy from AC system bus 80 can be transported to train 50 by converter device 70, and be transported to intermediate dc bus 72 after at least braking energy can be converted in a reverse direction.
In the present embodiment, braking energy management system 40 may include energy back feed device 401, energy feedback control device 41, apparatus for storing electrical energy 42 and energy-dissipating device 43.Apparatus for storing electrical energy 42 can be the other types of electrical energy storage device such as battery or ultracapacitor, flywheel energy storage, superconduction inductive energy storage, flow battery, compressed-air energy storage.Energy-dissipating device 43 is, for example, the device that energy can be dissipated with heat energy or other manner.Resistance is typically chosen as the element of energy-dissipating device 43.
In the embodiment shown in fig. 1, when train braking, synthesis of the braking energy in terms of three below is realized Energy management:The traction load 70a and/or non-traction load 30 of AC system bus 80 utilize energy, the storage energy of apparatus for storing electrical energy 42, the consumed energy of energy-dissipating device 43.
According to the present embodiment, when the train 50 in system is braked, braking energy feeds back to intermediate dc bus 72 by inverter 73.In order to realize that by the DC inverter of intermediate dc bus 72 be alternating current, the inversion of available energy feedback device 401 is alternating current, and the non-traction load 30 or traction load 70a being preferentially supplied on AC system bus 80 are used.In one embodiment, energy back feed device 401 can be made up of single inverter, and this is by described in reference picture 8- 10 embodiment.In another embodiment, can be configured to rectifier 71 can be with the rectifier of two-way flow with inversion function, energy(It is referred to as four-quadrant rectifier), this is by described in the embodiment of reference picture 6 and Fig. 7.This is integrated into converter device 70 equivalent to by energy back feed device 401, makes it can be with transmitted in both directions energy.
In order to implement braking energy control, system also includes energy feedback control device 41.As needed; energy feedback control device 41 may be connected to AC system bus 80, energy back feed device 401, converter device 70, connection protection device 45, braking chopping device 44 in it is part or all of, to realize the detection and energy management of system mode.
On the one hand, the braking energy being fed back on AC system bus 80 meets the indirect load 30 for tractor-trailer train such as power, the illumination on the bus and used first.To an AC system bus, the power of non-train traction load is usually to be basically unchanged.In the present embodiment; energy feedback control device 41 both can be by monitoring the load value in real time; can also be by pre-setting a fixed performance number and controlling the electric energy conveyed on AC system bus 80 to be not more than this setting value, to ensure the electric energy not feedback of superior power network 100 being fed back on AC system bus 80.
On the other hand, when a train(Such as train 50) braking, and another train(Such as train 50a) when being drawn, energy is obtained from higher level's power network 100, system busbar voltage class is transformed into by transformer 90, it is (not shown by associated with trailed train converter device;) to train power supply, tractor-trailer train is run.At this moment, energy feedback control device 41 can determine whether train traction by detecting the situation of the outlet side electric current of main transformer 90, if any then controlling the energy of braking train 50 to continue to the feedback of AC system bus 80.
Further, if energy feedback control device 41 detects the workload demand of AC system bus 80 less than may now be fed back to the braking energy of ac bus 80, start apparatus for storing electrical energy 42 and stored.When train 50 is again started up or accelerated, the energy of storage can be discharged by given pace, to be ready for next energy absorption.
In addition, if energy feedback control device 41, which detects apparatus for storing electrical energy 42, has been filled with energy, Then remaining braking energy is consumed by energy-dissipating device 43.
In an embodiment of the present invention, inverter 73 can be three-phase inverter, and this three-phase inverter 73 can be the Multilevel Inverters that three-level current transformer or two level current transformers or other level series are more than 3.Converter device 70 is run to the electric energy that motor 60 provides voltage, electric current and frequency can be adjusted with tractor-trailer train 50.
In the present embodiment, converter device 70 is that the energy of dual pulse width modulation can feedback type current transformer.Implementing the train traction stage, converter device 70 obtains electric energy from three-phase alternating current system bus 80.And in the train braking stage, braking energy can also be transmitted from motor 60 to the direction of ac bus 80.In the background of high speed Maglev, three-phase alternating current system bus 80 is 20kV buses, but this is intended to exemplarily illustrate the voltage magnitude that the present invention can be applied, rather than is used as limitation.
Apparatus for storing electrical energy 42 can be by energy storage device, such as ultracapacitor and corresponding control device composition.In order to protect apparatus for storing electrical energy 42, connection protection device 45 is set in the front end of apparatus for storing electrical energy 42.Connection protection device 45 can control the electric energy conducting path between the intermediate dc bus 72 of apparatus for storing electrical energy 42 and the converter device being attached thereto, to determine release storage or release energy.
When braking energy is without the other direction flowings of normal direction, consumption, consumed by energy-dissipating device 43.The element of energy-dissipating device 43 can be the resistance for meeting power demand under train maximum possible brake condition that cast iron or stainless steel or other materials are made.Energy-dissipating device 43 is connected to converter device intermediate dc bus 72 through braking chopping device 44, the braking chopping device 44 can open or close the electric energy conducting path between energy-dissipating device 43 and intermediate dc bus 72, and energy-dissipating device 43 whether is flowed to control electric current.
Non- traction load 30 may include the non-draw-gears such as power, the lighting device being connected on AC system bus 80.
Converter device 70a is the traction load relevant with drawing another train 50a being connected on AC system bus 80.This another train 50a can have the EMS 40a similar to train 50.
Fig. 2 is the braking energy management process for showing one embodiment of the invention in a flowchart.Fig. 5 intuitively shows that the dotted line in 3 kinds of circulation paths of braking energy, Fig. 5 represents the flow direction of energy.The control flow of EMS in the present embodiment is described referring to Fig. 2 and Fig. 5:
In step 301, when tractor-trailer train 50 is run, system obtains energy from three-phase alternating current system bus 80, by rectifier 71, intermediate dc bus 72, inverter 73, is sent to motor 60, and driving train 50 is run.
When train 50 is braked, the kinetic energy of train 50 is changed into electric energy by motor 60, then passes through inverter
73rd, braking energy is preferentially supplied to three-phase alternating current system bus 80 by intermediate dc bus 72, rectifier 71 Under load 70a, 30 use.
Specifically, in step 302, it is fed back to the braking energy on AC system bus 80 and provides electric energy to the indirect load 30 for tractor-trailer train such as the power on AC system bus, illumination first.To an AC system bus, the power of non-train traction load is usually to be basically unchanged.A fixed power threshold P0 can be pre-set, this power threshold P0 is not more than the power of non-traction load 30, and control the power no more than P0 that is conveyed on AC system bus 80.
In step 303, when a train, as train 50 is braked, and another train, when being drawn such as train 50a, system obtains energy from higher level's power network 100, and the voltage class of AC system bus 80 is transformed into by three-phase alternating current main transformer 90, powered, run with tractor-trailer train 50a to its long stator synchronous linear motor 60a by the converter device 70a corresponding to train 50a.At this moment, the load condition of ac bus system 80 is detected by the busbar voltage of energy feedback control device 41, current sense function(The load represents the overall target of voltage and current), can determine whether that train is just drawn, if any then the energy of control train 50 continues to the feedback of ac bus system 80.
In step 304, if the load 70a, 30 energy requirement sum on AC system bus 80 are less than the braking energy of now possible feedback straight edge line, start apparatus for storing electrical energy 42 and stored.By the voltage Vx for the intermediate dc bus 72 for detecting converter device 70, judge whether apparatus for storing electrical energy 42 is filled with, be such as filled with, then entered step 305.
In step 305, remaining braking energy flows to energy-dissipating device 43 by braking chopping device 44, all, is consumed by energy-dissipating device 43.
State on the implementation in energy management control process, system energy feedback control device 41, by detecting the voltage of ac bus 80 and/or electric current, it is to avoid the feedback of braking energy superior power network 100.
In above-mentioned steps 304, the charging and discharging control such as Figure 30 of apparatus for storing electrical energy 42) shown in.With dual pulse width modulation energy can feedback type converter device 70 intermediate dc bus 72 DC bus-bar voltage VI and input side rectifier(Come from 80-side of AC system bus)Electric current(Or power)II is reference, implements the storage or the release to intermediate dc bus 72 of energy.This can be avoided controlling with the coordination that converter device 70 itself carries out complexity in control.Control mode is:
In step S 10, control device 41 detects the DC bus-bar voltage of intermediate dc bus 72.When detecting DC bus-bar voltage higher than voltage threshold VI in step S 11, apparatus for storing electrical energy 42 stores energy untill being filled with step S 12.
In step S 13, the detection converter device input side power P l of control device 41, or react the current value II of the performance number.When in step S14 detect input side rectifier power P 1 (;Or current value II) be more than When 0, illustrate that converter device 70 absorbs energy from the side of three-phase alternating current system bus 80, after converter device 70 is converted, haulage capacity is provided to traction electric machine.Now, apparatus for storing electrical energy 42 also releases energy to intermediate dc bus 72, the energy that the last brake stage is stored discharges provides portion of energy for tractor-trailer train, while being ready for the train braking stage next time to the charging of apparatus for storing electrical energy 42.
It is to be appreciated that the opportunity that apparatus for storing electrical energy 42 releases energy is not limited to above-mentioned example, in fact.Control device 41 can be in the energy for thinking to need to discharge apparatus for storing electrical energy 42 to any moment that traction electric machine 60 provides energy.
On energyreleaserate, it is assumed that P2 represents the peak power of apparatus for storing electrical energy 42, the power for the input side rectifier that the expressions of P 1 are detected, as P 1>During P2 (;Step S 15), apparatus for storing electrical energy 42 released energy with power P 2 (;Step S 16);No shellfish I ", apparatus for storing electrical energy 42 released energy with power P 1 (;Step S 17).In above-mentioned step 305, shown in the charge and discharge control reference picture 3 (b) of energy-dissipating device 43, DC bus-bar voltage threshold value V2 is set, DC bus-bar voltage (step S20) is detected by converter device 70, whether threshold value V2 (step S21) is more than according to the DC bus-bar voltage of intermediate dc bus 72, controls whether to discharge electric energy to energy-dissipating device 43.In the case where DC bus-bar voltage is more than threshold value V2, start braking chopping device 44, release energy to energy-dissipating device 43 (;Step S22).
Above-mentioned threshold value VI, V2 is the DC bus-bar voltage of intermediate dc bus 72, and its magnitude relationship is V2>V1.As an example, intermediate dc bus voltage is ± 2500V.It is ± 2300V that threshold voltage can use VI in actual circuit, and V2 is ± 2700V.
Fig. 5 shows apparatus for storing electrical energy 42 and dc bus connection diagram.Apparatus for storing electrical energy 42 needs to coordinate control with converter device 70 at several aspects.One example is the coordination control of Preservation tactics, in order to avoid influenceing the Preservation tactics of converter device 70, increases full control switch 46 between the pre-charge circuit 48 and breaker 47 of apparatus for storing electrical energy 42.When implementing error protection, converter device 70 can cut off the path that apparatus for storing electrical energy 42 provides energy by intermediate dc bus 72 to converter device 70 at once.
Another example is to shut down electric discharge to coordinate control.Converter device 70 can disconnect breaker 47 in maintenance down, so as to realize the electrical connection and cut-out between apparatus for storing electrical energy 42 and converter device 70.
When converter device 70 is three-level current transformer, the access way of apparatus for storing electrical energy 42 and discharge and recharge also need to carry out coordination control with three level neutral-point voltage balances.
Fig. 6 is a kind of mode of access current transformer dc bus according to the present invention, shown in reference picture 6, three-phase alternating current system bus 801 connects rectifier 71 1,715 and rectifier 713,714 respectively by the group of transformer 712,716,717 and 718.Inductance 722,722' are smoothing reactor, and electric capacity 741,742 is voltage Support Capacitor.Resistance 431,431' and not shown cable, cabinet and the cooling device that may have constitute energy-dissipating device 44, and the switching tube 441,441 ' that controlled device 401 is controlled constitutes braking chopping device 44.Inversion unit 73 1 is connected across between positive and negative dc bus, forms a bridge arm of inverter.Three inversion units 731 are included in converter device.Apparatus for storing electrical energy 421 and 422 is connected across on positive and negative dc bus after connecting.Apparatus for storing electrical energy 421,422 to dc bus 72 when releasing energy, the mode that low current can be taken to release energy, it is to avoid controls rectifying part the influence of neutral point voltage balance.
Fig. 7 is the mode of another access current transformer direct current bus device according to the present invention.Most of structure in Fig. 7 is identical with Fig. 6, and simply apparatus for storing electrical energy 421 and 422 is connected across between the positive and negative dc bus of inverter and center line respectively.It is this be connected across respectively above and below mode on two electric capacity, the neutral balance ability of converter device can be strengthened.
The above two mode of apparatus for storing electrical energy access intermediate dc bus can be assisted to provide haulage capacity when train accelerates, so as to eliminate the spike that energy is absorbed from power network.
Rectifier 71 except use with the same structure of inverter 73 not only can with inversion but also can be with the device of rectification in addition to, may also be the three phase full bridge as shown in figure 12 being made up of power diode can not control rectifier, or the half-control rectifier shown in Figure 13, or the full-controlled rectifier device shown in Figure 14.The embodiment of the rectifier introduced below for not including inversion function using these.
Fig. 8 be the present invention EMS in current transformer Converting Unit be three-level inverter one embodiment.It is similar with Fig. 6 example, in the present embodiment, it is possible to feedback device 401,402 is measured, apparatus for storing electrical energy 421,422, and energy-dissipating device 431,432, on the positive and negative dc bus for being respectively directly connected to three-level inverter 731,732.Energy back feed device 401,402 be with inverter 731,732 identical inverters, can by DC power conversion be alternating current.
Fig. 9 be the present invention EMS in current transformer Converting Unit be three-level inverter one embodiment.It is similar with Fig. 7 example, in the present embodiment, energy back feed device 401 and 402,403 and 404, apparatus for storing electrical energy 421 and 422,423 and 424, and energy-dissipating device 43 1 and 432,433 and 434, respectively it is connected across between the positive and negative dc bus of three-level inverter 731,732 and split capacitor midpoint.
Figure 10 be the present invention EMS in current transformer Converting Unit be two-level inverter an example.In the present embodiment, it is possible to measure feedback device 401,402, apparatus for storing electrical energy 421,422, and energy-dissipating device 431,432, on the positive and negative dc bus for being respectively directly connected to two-level inverter 731,732.
Fig. 11 is one embodiment that apparatus for storing electrical energy is connected to ac bus in the present invention.In the present embodiment In, apparatus for storing electrical energy 421 is not connected to the dc bus of the intermediate dc bus 72 of inverter, and is attached to the ac bus 80 of system.Different from the embodiment for being connected to inverter dc bus, the embodiment for being connected to system ac bus 80 has the benefit that:One is can apply in the inverter of no dc bus, such as AC/AC motor driving systems, matrix form motor driving system.Two be that a set of energy accumulating device can be used in conjunction with for many set inversion systems simultaneously, by contrast, can only be used in the energy storage system for being connected to inverter dc bus for a set of inversion system.
Figure 12 is one embodiment that current transformer rectifying part is uncontrollable rectifier bridge in the present invention.In the present embodiment, uncontrollable rectifier bridge 761 is connected with inverter 762, is that traction electric machine 763 is powered.
Figure 13 is the example that current transformer rectifying part is half control rectifier bridge in the present invention.In the present embodiment, half control rectifier bridge 764 is connected with inverter 765, is that traction electric machine 766 is powered.
Figure 14 is the example that current transformer rectifying part is full-controlled rectifier bridge in the present invention.In the present embodiment, full-controlled rectifier bridge 771 is connected with inverter 772, is that traction electric machine 773 is powered.
Embodiments of the invention by brake energy feedback system bus, by apparatus for storing electrical energy storage by, for utilization next time, having reclaimed braking energy, having reduced the waste of energy.Further, since the energy for feeding back to system busbar is only used for the non-draw-gear or other draw-gears in one's respective area, not feedback higher level power network, so harmonic pollution and the feedback current impact for higher level's power network will not be caused.
By taking each current transformer situation in a certain Traction Station as an example, its configuration condition is as follows:The power of feedback system bus is allowed to be calculated according to the assembly average 1MW of non-draw-gear;Energy-storage units are configured to
105MJ/1MW (often covers current transformer respectively with a set of).
For one 5 marshalings, the common 391.2MJ of its braking energy.Wherein, the non-draw-gear of system busbar consumes braking energy 90.42MJ altogether, and apparatus for storing electrical energy can absorb braking energy 238.9MJ, braking resistor consumption braking energy 61.85MJ.Braking energy utilization rate is up to 84%, and energy-saving effect is obvious.
Pass through further rationally layout Transportation Organization, in the multiple train converter devices for ensureing to be connected on same system bus, during one train braking, separately there are other vehicles to be in traction state, the braking energy being then consumed in braking resistor can substantially be reduced or be 0, and such braking energy utilization rate bigger can be improved.

Claims (19)

  1. Claim
    1. a kind of braking energy management system, it is contained in a trailer system, the trailer system includes electric power system bus, the traction electric machine for drawing a dynamical system and converts the electric power signal of the electric power system bus to be adapted to the converter device that the traction electric machine is used, and the braking energy management system includes:
    Energy back feed device, connects the converter device and the electric power system bus, when the energy back feed device is activated, and braking energy is obtained and to braking energy described in the electric power system bus feedback from the converter device;Apparatus for storing electrical energy, one of the converter device and the electric power system bus are connected by the first controllable electric energy conducting path;
    Energy-dissipating device, the converter device is connected by the second controllable electric energy conducting path;And
    Control device, to perform following operation:
    When detecting dynamical system braking, start energy back feed device first, braking energy is directed into the electric power system bus;
    When the energy requirement for detecting traction load on the electric power system bus and/or non-traction load is less than braking energy, the first electric energy conducting path is opened with by energy storage to the apparatus for storing electrical energy;And
    When detecting apparatus for storing electrical energy and being filled with electric energy, open the second electric energy conducting path energy is imported into energy-dissipating device consumption.
    2. braking energy management system according to claim 1, wherein the energy back feed device is configured independently of the converter device.
    3. braking energy management system according to claim 2, wherein the energy back feed device is inverter.
    4. braking energy management system according to claim 1, wherein the energy back feed device is integrated with the converter device, enables the converter device that braking energy to be oppositely transformed to the electric power signal of electric power system bus.
    5. braking energy management system according to claim 1, in addition to a connection protection device, respond the control device and open or close the first electric energy conducting path, the apparatus for storing electrical energy is carried out charge or discharge.
    6. braking energy management system according to claim 1, in addition to a braking chopping device, respond the control device and open or close the second electric energy conducting path, to control whether energy imports the energy-dissipating device.
    7. braking energy management system according to claim 1, wherein control device are needing to open the first electric energy conducting path to any time that traction electric machine provides energy, to discharge the energy of the apparatus for storing electrical energy
    8. braking energy management system according to claim 1, wherein the apparatus for storing electrical energy includes at least one of battery, ultracapacitor, flywheel energy storage, superconduction inductive energy storage, flow battery, compressed-air energy storage.
    9. braking energy management system according to claim 2, wherein the converter device includes inverter, rectifier and the dc bus between inverter and rectifier.
    10. braking energy management system according to claim 4, wherein described converter device includes inverter, rectifier and the dc bus between inverter and rectifier, wherein the rectifier is can to carry out the four-quadrant rectifier of rectification and inversion.
    11. braking energy management system according to claim 9, wherein the rectifier is uncontrollable rectifier device, half-control rectifier, full-controlled rectifier device or its combination.
    12. the braking energy management system according to claim 9 or 10, wherein the inverter is two level, three level or many level topological structures.
    13. a kind of braking energy management method, applied to a trailer system, the trailer system includes electric power system bus, the traction electric machine for drawing a dynamical system and converts the electric power signal of the electric power system bus to be adapted to the converter device that the traction electric machine is used, and this method comprises the following steps:
    When detecting dynamical system braking, the braking energy for being obtained the converter device from traction electric machine using an energy back feed device is preferential to the electric power system bus feedback, thinks that non-traction load and/or traction load on the electric power system bus are powered;
    When the energy requirement for detecting traction load on the electric power system bus and/or non-traction load is less than braking energy, braking energy is stored into an apparatus for storing electrical energy;
    When detecting apparatus for storing electrical energy and being filled with electric energy, braking energy is imported into energy-dissipating device consumption.14. braking energy management method according to claim 13, wherein detecting whether the energy requirement of traction load on the electric power system bus and/or non-traction load is less than braking energy and includes detecting whether the voltage on the electric power system bus is more than a voltage threshold.
    15. braking energy management method according to claim 13, wherein for the non-traction load and/or traction load on the electric power system bus power including:
    Powered with the predetermined power corresponding to the non-traction load on the electric power system bus;And When detect there is another dynamical system on the electric power system bus and drawn when, the energy back feed device is continued to the electric power system bussed supply.
    16. braking energy management method according to claim 13, the wherein converter device include inverter, rectifier and the dc bus between inverter and rectifier;The energy back feed device is connected to the rectifier and the electric power system bus.
    17. braking energy management method according to claim 16, includes detecting whether the DC bus-bar voltage is more than a voltage threshold wherein detecting apparatus for storing electrical energy and being filled with electric energy.
    18. braking energy management method according to claim 13, wherein discharging the energy of the apparatus for storing electrical energy in any time that needs provide energy to traction electric machine.
    19. braking energy management method according to claim 18, wherein the power for discharging the energy of the apparatus for storing electrical energy is according to predetermined curve progress.
    20. a kind of braking energy management method, applied to a trailer system, the trailer system is comprising electric power system bus, multiple traction electric machines for drawing multiple dynamical systems and converts the electric power signal of the electric power system bus to be adapted to multiple converter devices that each traction electric machine is used, and this method comprises the following steps:When any dynamical system in multiple dynamical systems is braked, the braking energy for being obtained the converter device from traction electric machine using an energy back feed device is preferential to the electric power system bus feedback;
    When the energy requirement for detecting traction load on the electric power system bus and/or non-traction load is less than braking energy, braking energy is stored into an apparatus for storing electrical energy;And
    When detecting apparatus for storing electrical energy and being filled with electric energy, braking energy is imported into energy-dissipating device consumption.
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