CN105391150A - Trolleybus power supply system and power supply control method thereof - Google Patents
Trolleybus power supply system and power supply control method thereof Download PDFInfo
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- CN105391150A CN105391150A CN201510880635.XA CN201510880635A CN105391150A CN 105391150 A CN105391150 A CN 105391150A CN 201510880635 A CN201510880635 A CN 201510880635A CN 105391150 A CN105391150 A CN 105391150A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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Abstract
The invention relates to a trolleybus power supply system and a power supply control method thereof. The system comprises an isolated DC/DC unit, a super capacitor, a bidirectional DC/DC unit and a power battery, the input end of the isolated DC/DC unit is connected with the DC power supply line network via a trolley pole, the isolated DC/DC unit is connected to a power system of a trolley bus via the super capacitor, and the power battery is connected to the input end of the isolated DC/DC unit via the bidirectional DC/DC unit. During power supply control, the practical voltage of the DC network is collected in real time, and power supply is controlled correspondingly according to the condition that the practical voltage satisfies. The voltage of the network is collected directly, power supply is controlled according to fluctuation, and operation of the trolleybus can be effectively controlled; and when the voltage of the network fluctuates widely, corresponding control and adjustment are implemented to prevent devices in the power supply system of the trolleybus from damage, safe operation of the trolleybus is ensured, and passengers and drivers are prevented from personal injury.
Description
Technical field
The present invention relates to a kind of power supply system for trolley bus and method for controlling power supply thereof.
Background technology
Trolley bus, as a kind of conventional truck, once played certain effect in urban public transport field, but due to itself defect, along with technical development, trolley bus gradually replace by the mass transportation facilities of fuel power.
Along with environmental pollution and energy problem constantly aggravate, trolley bus is got back in the visual field of people again, and trolley bus, with the advantage of its " zero discharge ", can meet the demand of air contaminant treatment, and meet the developing direction of new-energy automobile, day by day receive the concern of people.
Application number be 201410319626 Chinese patent application disclose a kind of trolley bus and its isolated electric power system, this electric power system operationally, according to the size of car load demand power, the isolated DC/DC of corresponding control and electrokinetic cell meet effective operation of vehicle.But the power supply gauze due to trolley bus is direct current, it is the high voltage direct current obtained by the rectification of three-phase alternating current electric boost, and because feed line of power supply is longer and the uncertainty of load, easily cause the instability of gauze voltage and the exception of system load work, and this exception has influence on the power supply quality of gauze further.Under the prerequisite of gauze spread of voltage, according to effective operation of the size of car load demand power just uncontrollable electric car, when gauze voltage fluctuation is comparatively serious, the consequence that power supply system for trolley bus internal unit damages may be caused, not only cannot ensure the safe operation of electric car, and personal injury may be caused to passenger and driver.
Summary of the invention
The object of this invention is to provide a kind of power supply system for trolley bus, in order to solve under the prerequisite of gauze spread of voltage, the problem of effective operation of uncontrollable electric car.The present invention provides the method for controlling power supply of this power supply system for trolley bus simultaneously.
For achieving the above object, the solution of the present invention comprises a kind of power supply system for trolley bus, comprise: isolation DC/DC, super capacitor, two-way DC/DC and electrokinetic cell, the input of described isolation DC/DC is connected with direct current supply gauze by trolley pole, and described isolation DC/DC connects the dynamical system of trolley bus by described super capacitor; Described electrokinetic cell is connected to the input of described isolation DC/DC by described two-way DC/DC.
Described two-way DC/DC comprises a switching tube branch road, and described switching tube props up the switching tube module composition of route two series connection; Described switching tube branch road is connected between the input of described two-way DC/DC, and one of them switching tube module is in parallel with a power line, and on this power line, string is provided with an inductance and described electrokinetic cell.
Circuit between the input of described trolley pole and isolation DC/DC is serially connected with a diode and the first pre-charge module, described first pre-charge module is made up of the first precharge branch and the first main electrical scheme branch circuit parallel connection, in described first precharge branch, string is provided with the first precharge switch and the first divider resistance, and on described first main electrical scheme branch road, string is provided with the first main switch.
On described power line, also string is provided with the second pre-charge module, described second pre-charge module is made up of the second precharge branch and the second main electrical scheme branch circuit parallel connection, in described second precharge branch, string is provided with the second precharge switch and the second divider resistance, and on described second main electrical scheme branch road, string is provided with the second main switch.
Described two-way DC/DC also comprises the first capacitive branch and the second capacitive branch, described first capacitive branch is serially connected with the first electric capacity, second capacitive branch is serially connected with the second electric capacity, described electrokinetic cell is in parallel with described first capacitive branch with the series circuit of described second pre-charge module, and described second capacitive branch is connected between the input of described two-way DC/DC.
Be exclusively used in a method for controlling power supply for the power supply system for trolley bus of above-mentioned power supply system for trolley bus, comprise the following steps:
(1) the actual voltage value V of Real-time Collection direct current gauze
actual;
(2) V is worked as
actualmeet: V
1< V
actual< V
2time, gauze provides electric energy by isolation DC/DC for electric car;
Work as V
actualmeet: V
3< V
actual< V
4time, gauze is by isolation DC/DC for electric car provides electric energy, and it is power battery charging that two-way DC/DC crosses in isochrone Netcom;
Work as V
actualmeet: V
actual< V
5time, gauze provides electric energy by isolation DC/DC for electric car, simultaneously electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy;
Wherein, V
1, V
2, V
3, V
4, V
5be setting voltage value, and V
5< V
1< V
2< V
3< V
4.
Described step (2) also comprises:
Work as V
actualmeet: V
actual>=V
4time, and when the duration is greater than or equal to the first setting-up time, gauze not by isolation DC/DC for electric car provides electric energy, and electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy, electric car downrating.
Describedly work as V
actualmeet: V
actual< V
5be specially:
Work as V
6< V
actual< V
5time, gauze provides electric energy by isolation DC/DC for electric car, simultaneously electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy;
Work as V
actual≤ V
6time, and when the duration is greater than or equal to the second setting-up time, gauze by isolation DC/DC for electric car provides electric energy, simultaneously electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy, electric car downrating;
Wherein, V
6for setting voltage value.
Describedly work as V
actualmeet: V
1< V
actual< V
2time: when SOC>=90% of electrokinetic cell, electrokinetic cell does not work; When the SOC of electrokinetic cell meets: during 75%≤SOC<90%, gauze is that electrokinetic cell carries out trickle charge by two-way DC/DC, and trickle is here: the scope of charging current is 0-0.2C.
Described V
1=85% × V
nominal, described V
2=115% × V
nominal, described V
3=116% × V
nominal, described V
4=130% × V
nominal, described V
5=84% × V
nominal, described V
6=70% × V
nominal, wherein, described V
mark claimfor the gauze voltage nominal value of setting; Described first setting-up time and the second setting-up time are 30s.
In power supply system for trolley bus provided by the invention, comprise a two-way DC/DC and electrokinetic cell, the input of two-way DC/DC connects the input of isolation DC/DC, and the output of two-way DC/DC connects electrokinetic cell.This electric power system operationally, the first actual voltage value of Real-time Collection direct current gauze; Then the control of powering is carried out according to the actual gauze magnitude of voltage collected, which is from the most basic control element, owing to there is close relationship between gauze fluctuation and the operation of electric car, so, draw according to the relation between the actual voltage value of gauze and several set points the power that gauze fluctuates, then correspondingly control according to fluctuation power.By directly gathering the voltage of gauze, power supply control is carried out according to fluctuation, certainly the operation of electric car can effectively be controlled, and when gauze voltage fluctuation is comparatively serious, by correspondingly regulating and controlling, avoid the consequence that power supply system for trolley bus internal unit damages, not only ensure that the safe operation of electric car, and avoid personal injury is caused to passenger and driver.
Accompanying drawing explanation
Fig. 1 is the entire block diagram of power supply system for trolley bus;
Fig. 2 is the main topological diagram of two-way DC/DC.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Power supply system for trolley bus as shown in Figure 1, comprise: isolation DC/DC, super capacitor, two-way DC/DC and electrokinetic cell, the input of isolation DC/DC is connected with direct current supply gauze by trolley pole, the output of isolation DC/DC connects the dynamical system of trolley bus, i.e. High-Voltage Electrical Appliances system by super capacitor.The input of two-way DC/DC connects the input of isolation DC/DC, and the output of two-way DC/DC connects electrokinetic cell.This electric power system can also arrange separately a controller, or uses the entire car controller of electric car, and controller inside is provided with software program, controls corresponding equipment work accordingly by the software program of setting.
Circuit between the input of trolley pole and isolation DC/DC is serially connected with a diode and the first pre-charge module, first pre-charge module is made up of the first precharge branch and the first main electrical scheme branch circuit parallel connection, in first precharge branch, string is provided with the first precharge switch K1 and the first divider resistance, and on the first main electrical scheme branch road, string is provided with the first main switch K2.Utilizing the unilateral conduction of diode, making electric energy have anti-reverse protection when inputting; In addition, when linked network travels, trolley pole contact gauze, electrical vehicular power system is from gauze power taking, and in power up, the K1 adhesive in precharge branch, carries out precharge; After precharge completes, closed main switch K2, has powered on.
As shown in Figure 2, two-way DC/DC comprises a switching tube branch road, and this switching tube props up the switching tube module composition of route two series connection, and each switching tube module is made up of the diode of a switching tube and a reverse parallel connection; Switching tube branch road is connected between two inputs of two-way DC/DC, one of them switching tube module is in parallel with a power line, on this power line, string is provided with inductance L, the second pre-charge module and electrokinetic cell, this second pre-charge module is made up of the second precharge branch and the second main electrical scheme branch circuit parallel connection, in second precharge branch, string is provided with the second precharge switch KM1 and the second divider resistance R, and on the second main electrical scheme branch road, string is provided with the second main switch KM.When after closed main switch K2, power on, when two-way DC/DC needs to devote oneself to work, switching process in second pre-charge module is identical with above-mentioned first pre-charge module, namely line closes KM1, more closed KM, has come to provide electric energy to power battery charging or electrokinetic cell.
One of them input of this two-way DC/DC is by connection another output to this two-way DC/DC.As shown in Figure 2, this two-way DC/DC also comprises the first capacitive branch and the second capacitive branch, first capacitive branch is serially connected with electric capacity C1, second capacitive branch is serially connected with electric capacity C2, second pre-charge module is in parallel with the first capacitive branch with the series circuit of electrokinetic cell, and the second capacitive branch is connected between the input of this two-way DC/DC.
The operation principle of this two-way DC/DC is: two-way DC/DC is when linked network, and C1 is by KM1 preliminary filling, and C2 is by K1 preliminary filling, when electrokinetic cell needs electric discharge, Q2 does switching tube, and L does energy storage inductor, the diode that Q1 is corresponding does fly-wheel diode, and this two-way DC/DC forms booster circuit; In like manner, when electrokinetic cell needs charging, Q1 does switching tube, and L does energy storage inductor, and the diode that Q2 is corresponding does fly-wheel diode, and this two-way DC/DC forms reduction voltage circuit.
This electric power system is using direct current gauze as main power supply energy, and electrokinetic cell is as the auxiliary power supply energy.Super capacitor exports as isolation DC/DC and supports, and bears the recovery of transient power and braking energy.
This electric power system carries out correspondingly power supply control according to gauze voltage, first, and the actual voltage value V of Real-time Collection direct current gauze
actual.This actual voltage value V
actualflow to controller, controller is according to the program of inside to isolation DC/DC, two-way DC/DC, and K switch 1, K2, KM1 and KM control.The program entirety of inner setting is according to actual voltage value V
actualwith the nominal voltage V of setting
nominalbetween magnitude relationship control, be specially:
When gauze voltage stabilization, i.e. the gauze voltage V that arrives of actual acquisition
actualwithin being stabilized in nominal value 15% fluctuation range, i.e. 85%V
nominal< V
actual< 115%V
nominaltime, gauze is as energy constant source, and super capacitor is used for stable power-supplying voltage, and the continuous energy of car load is that AC line Netcom crosses isolated DC/DC and changes and obtain, and when car brakeing, super capacitor absorbs braking energy, and is that drive motors is powered when vehicle operating; In addition, controller is according to the SOC situation of electrokinetic cell, and control AC line Netcom crosses two-way DC/DC and carries out step-down benefit electricity to electrokinetic cell or do not mend electricity, and specific strategy is: when the SOC of electrokinetic cell is greater than or equal to 90%, electrokinetic cell does not work, and namely gauze does not give power battery charging; When the SOC of electrokinetic cell is greater than or equal to 75% and is less than 90%, controller controls two-way DC/DC and carries out trickle benefit electricity to electrokinetic cell, and namely small area analysis mends electricity, and current range is 0-0.2C.
When gauze voltage fluctuation is larger:
As voltage V
actualhigher than nominal voltage V
nominalduring 16%-30%, i.e. 116%V
nominal< V
actual< 130%V
nominaltime, the continuous energy of car load is still obtained by isolated DC/DC conversion, and super capacitor plays stable both end voltage and absorbs the effect of braking energy; In addition, for ensureing the efficient of system, this Time Controller controls two-way DC/DC and enters decompression mode, is namely charged to electrokinetic cell by two-way DC/DC, is reached the object reducing gauze voltage to a certain extent by two-way DC/DC step-down.Due to when gauze voltage stabilization, electrokinetic cell is when SOC is greater than or equal to 90%, and electrokinetic cell does not work, and namely reserves the surplus of 10% in electrokinetic cell to charge to battery, and then plays the effect reducing gauze voltage.
As gauze voltage V
actualduring lower than nominal voltage 16%, i.e. V
actual< 84%V
nominaltime, gauze provides electric energy by isolation DC/DC for electric car, simultaneously electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy.Specifically be divided into following two parts: as gauze voltage V
actualduring lower than nominal voltage 16%-30%, i.e. 70%V
nominal< V
actual< 84%V
nominaltime, the continuous energy of car load is obtained by isolated DC/DC conversion, super capacitor plays burning voltage and absorbs the effect of braking energy, for ensureing the efficient of system, now the two-way DC/DC of vehicle control unit controls enters boost mode, namely control electrokinetic cell and provide electric energy by two-way DC/DC and isolation DC/DC for electric car successively, reach by two-way DC/DC boosting the object controlling gauze voltage; As gauze voltage V
actuallower than nominal V
nominal30%, i.e. V
actual≤ 70%V
nominaltime and the duration more than 30s time, K2 is now kept to close, control electrokinetic cell and provide electric energy by two-way DC/DC and isolation DC/DC for electric car successively, it is that isolated DC/DC powers that two-way DC/DC enters boost mode, it is that car load is powered that isolated DC/DC obtains the energy from two-way DC/DC, and car load enters downrating.Due to the brownout in gauze, and electricity in electrokinetic cell is limited, if at this moment control trolley bus capacity operation, not only gauze voltage cannot satisfy condition, and the performance of battery-powered time and injury battery can be reduced, so, now control the drive motors downrating of electric car, such as: work as V
actualequal 60%V
nominaltime, drive motors is driving electric car to travel with flat-out 80%, and gauze voltage not only can play certain support, and can increase the power-on time of battery, reduces the injury to battery.Now detect gauze terminal voltage in real time, when gauze terminal voltage returns in normal range (NR), car load is from gauze power taking.
As gauze voltage V
actualexceed nominal V
nominal30%, i.e. V
actual>=130%V
nominaltime and the duration more than 30s time, now gauze does not provide electric energy by isolation DC/DC for electric car, namely controller controls to cut off K2, and controller controls two-way DC/DC enters boost mode, electrokinetic cell is successively by two-way DC/DC and isolation DC/DC electric discharge, for electric car provides electric energy, and now electric car downrating.Because the electricity in electrokinetic cell is limited, only having in the battery-powered situation of power electric, if at this moment control trolley bus capacity operation, more can reduce battery-powered time, also can injure the performance of battery further, so, now more need the drive motors downrating controlling electric car, such as: drive motors, carrying out driving electric car traveling with flat-out 70%, does the power-on time that can increase battery like this, and reduces the injury to battery.In addition, this Time Controller detects gauze voltage in real time, and when gauze terminal voltage returns in normal range (NR), closed K2 again, car load is from gauze power taking.
When electric car is braked: isolation DC/DC does not judge output voltage, directly enters standby, enters after driving condition until system, reenter driving operating state.
When electric car is under off-grid state, controls and guarantee that K1 and K2 disconnects, and electrokinetic cell successively by two-way DC/DC and isolation DC/DC be that electric car is powered, namely electric car only from electrokinetic cell obtain the energy, other operating states are identical with linked network.
In above-described embodiment, V1=85% × V
nominal, V2=115% × V
nominal, V3=116% × V
nominal, V4=130% × V
nominal, V5=84% × V
nominal, V6=70% × V
nominal, V
nominalfor the gauze voltage nominal value of setting, and the concrete value of time parameter is 30s, but the present invention is not limited to above-mentioned concrete value, scale parameter and time parameter can according to specific circumstances, such as: the specific requirement of electric car safe operation correspondingly chooses; And choosing of V1, V2, V3, V4, V5, V6 is not and V yet
nominalhave certain proportionate relationship, these six set points can be arranged as the case may be.
Be presented above concrete execution mode, but the present invention is not limited to described execution mode.Basic ideas of the present invention are above-mentioned basic scheme, and for those of ordinary skill in the art, according to instruction of the present invention, designing the model of various distortion, formula, parameter does not need to spend creative work.The change carried out execution mode without departing from the principles and spirit of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (10)
1. a power supply system for trolley bus, it is characterized in that, comprise: isolation DC/DC, super capacitor, two-way DC/DC and electrokinetic cell, the input of described isolation DC/DC is connected with direct current supply gauze by trolley pole, and described isolation DC/DC connects the dynamical system of trolley bus by described super capacitor; Described electrokinetic cell is connected to the input of described isolation DC/DC by described two-way DC/DC.
2. power supply system for trolley bus according to claim 1, is characterized in that, described two-way DC/DC comprises a switching tube branch road, and described switching tube props up the switching tube module composition of route two series connection; Described switching tube branch road is connected between the input of described two-way DC/DC, and one of them switching tube module is in parallel with a power line, and on this power line, string is provided with an inductance and described electrokinetic cell.
3. power supply system for trolley bus according to claim 1, it is characterized in that, circuit between the input of described trolley pole and isolation DC/DC is serially connected with a diode and the first pre-charge module, described first pre-charge module is made up of the first precharge branch and the first main electrical scheme branch circuit parallel connection, in described first precharge branch, string is provided with the first precharge switch and the first divider resistance, and on described first main electrical scheme branch road, string is provided with the first main switch.
4. power supply system for trolley bus according to claim 2, it is characterized in that, on described power line, also string is provided with the second pre-charge module, described second pre-charge module is made up of the second precharge branch and the second main electrical scheme branch circuit parallel connection, in described second precharge branch, string is provided with the second precharge switch and the second divider resistance, and on described second main electrical scheme branch road, string is provided with the second main switch.
5. power supply system for trolley bus according to claim 4, it is characterized in that, described two-way DC/DC also comprises the first capacitive branch and the second capacitive branch, described first capacitive branch is serially connected with the first electric capacity, second capacitive branch is serially connected with the second electric capacity, described electrokinetic cell is in parallel with described first capacitive branch with the series circuit of described second pre-charge module, and described second capacitive branch is connected between the input of described two-way DC/DC.
6. be exclusively used in a method for controlling power supply for the power supply system for trolley bus of power supply system for trolley bus described in claim 1, it is characterized in that, comprise the following steps:
(1) the actual voltage value V of Real-time Collection direct current gauze
actual;
(2) V is worked as
actualmeet: V
1< V
actual< V
2time, gauze provides electric energy by isolation DC/DC for electric car;
Work as V
actualmeet: V
3< V
actual< V
4time, gauze is by isolation DC/DC for electric car provides electric energy, and it is power battery charging that two-way DC/DC crosses in isochrone Netcom;
Work as V
actualmeet: V
actual< V
5time, gauze provides electric energy by isolation DC/DC for electric car, simultaneously electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy;
Wherein, V
1, V
2, V
3, V
4, V
5be setting voltage value, and V
5< V
1< V
2< V
3< V
4.
7. the method for controlling power supply of power supply system for trolley bus according to claim 6, is characterized in that, described step (2) also comprises:
Work as V
actualmeet: V
actual>=V
4time, and when the duration is greater than or equal to the first setting-up time, gauze not by isolation DC/DC for electric car provides electric energy, and electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy, electric car downrating.
8. the method for controlling power supply of power supply system for trolley bus according to claim 7, is characterized in that, describedly works as V
actualmeet: V
actual< V
5be specially:
Work as V
6< V
actual< V
5time, gauze provides electric energy by isolation DC/DC for electric car, simultaneously electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy;
Work as V
actual≤ V
6time, and when the duration is greater than or equal to the second setting-up time, gauze by isolation DC/DC for electric car provides electric energy, simultaneously electrokinetic cell successively by two-way DC/DC and isolation DC/DC for electric car provides electric energy, electric car downrating;
Wherein, V
6for setting voltage value.
9. the method for controlling power supply of power supply system for trolley bus according to claim 6, is characterized in that, describedly works as V
actualmeet: V
1< V
actual< V
2time: when SOC>=90% of electrokinetic cell, electrokinetic cell does not work; When the SOC of electrokinetic cell meets: during 75%≤SOC<90%, gauze is that electrokinetic cell carries out trickle charge by two-way DC/DC, and trickle is here: the scope of charging current is 0-0.2C.
10. the method for controlling power supply of power supply system for trolley bus according to claim 8, is characterized in that, described V
1=85% × V
nominal, described V
2=115% × V
nominal, described V
3=116% × V
nominal, described V
4=130% × V
nominal, described V
5=84% × V
nominal, described V
6=70% × V
nominal, wherein, described V
mark claimfor the gauze voltage nominal value of setting; Described first setting-up time and the second setting-up time are 30s.
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| CN201811081964.8A CN109347189A (en) | 2015-12-04 | 2015-12-04 | A kind of power supply system for trolley bus and its method for controlling power supply |
| CN201510880635.XA CN105391150B (en) | 2015-12-04 | 2015-12-04 | A kind of power supply system for trolley bus and its method for controlling power supply |
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| CN109347189A (en) | 2019-02-15 |
| CN105391150B (en) | 2018-11-06 |
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Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co., Ltd Address before: 450016 Yutong Industrial Zone, eighteen Li River, Henan, Zhengzhou Patentee before: Zhengzhou Yutong Bus Co., Ltd |