CN203301211U - A composite power supply for hybrid electric vehicles based on an improved filter power dividing control - Google Patents
A composite power supply for hybrid electric vehicles based on an improved filter power dividing control Download PDFInfo
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- CN203301211U CN203301211U CN2013203390221U CN201320339022U CN203301211U CN 203301211 U CN203301211 U CN 203301211U CN 2013203390221 U CN2013203390221 U CN 2013203390221U CN 201320339022 U CN201320339022 U CN 201320339022U CN 203301211 U CN203301211 U CN 203301211U
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- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 14
- 238000004146 energy storage Methods 0.000 claims abstract description 14
- 238000011217 control strategy Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 abstract description 9
- 238000007599 discharging Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
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- 238000010586 diagram Methods 0.000 description 4
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- 238000002788 crimping Methods 0.000 description 2
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Abstract
The utility model discloses a composite power supply for hybrid electric vehicles based on an improved filter power dividing control. The composite power supply comprises a super capacitor, a power converter, and a storage battery. The super capacitor and the power converter are connected in series to form an auxiliary energy storage system. The auxiliary energy storage system is connected with the storage battery in parallel to supply power for a load. The voltage on the storage battery is DC bus voltage. The power converter is a bidirectional DC-DC converter and uses topology in a non-isolation half-bridge structure and improved filter power dividing control strategy. In the composite power supply, the voltage of the super capacitor is capable of operating stably while satisfying dynamic load transformation, achieving an effect of an auxiliary power supply. When the load fluctuates, the discharging current of the storage battery in the composite power supply is smooth; a discharging process of the storage battery is optimized; and the cycle life of the storage battery is prolonged. The bidirectional DC-DC converter has an obvious control effect and high effectiveness.
Description
Technical field
The utility model relates to a kind of composite power source, particularly a kind of that control based on the Modified Filter power dividing, storage battery and ultracapacitor are combined and form the energy storage device of composite power source.
Background technology
Hybrid vehicle belongs to the pulse current load of real-time change, mainly may be embodied in and accelerates and regenerative braking two aspects.At present, the energy storage system of most of hybrid vehicle all is based on battery designs and completes, and because the storage battery specific power is low, cycle life is short and cost is high, has limited to a great extent development and the application of hybrid vehicle.For this problem, a common solution is exactly to reduce the demand of variable current to storage battery, thereby improves its performance and cycle life.For this reason, relevant scholar has proposed several schemes in succession provides equally loaded for storage battery, comprises flywheel energy storage, superconducting energy storage etc.What wherein study at most is exactly to introduce ultracapacitor as hybrid vehicle auxiliary energy storage system, thereby bears the high power requirements of storage battery when discharging and recharging continually.With storage battery and the ultracapacitor formation composite power source that combines, make the large and large characteristics of ultracapacitor specific power of storage battery specific energy combine, reduce to greatest extent simultaneously the deficiency of every kind of power supply, this brings very large performance to improve can for undoubtedly the hybrid vehicle energy storage system.
The structure of storage battery-ultracapacitor composite power source is more, and circuit is from simple to complexity.After introducing power inverter, composite power source can be divided into passive type and active two kinds.Passive type structure battery-ultracapacitor composite power source is that storage battery is directly in parallel with ultracapacitor, and active structure composite power supply is one of configuration or many DC-DC converter between storage battery and ultracapacitor.The control target of power inverter is: 1) output voltage of restriction ultracapacitor is within the scope of appointment; 2) optimize the output current of storage battery, make it as far as possible level and smooth, thus the cycle life that extends storage battery.Therefore, the overall performance of active structure composite power supply is more superior than passive type structure.
The utility model content
In order to overcome the deficiency of passive type structure composite power supply: storage battery, ultracapacitor must keep that terminal voltage is consistent, the flexibility of the upper shortage of design, terminal voltage along with the charge and discharge process variation greatly, affect loaded work piece performance etc., and the defect of active structure composite power flow-dividing control: the ultracapacitor output voltage can exceed its range of nominal tension, storage battery can not be operated in stable levels of current etc., and the utility model provides a kind of Hybrid Vehicle composite power source solution of controlling based on the Modified Filter power dividing.
The technical solution of the utility model is:
Control the Hybrid Vehicle composite power source based on the Modified Filter power dividing, comprise ultracapacitor, power inverter and storage battery, described ultracapacitor is connected with power inverter and is formed the auxiliary energy storage system, and described auxiliary energy storage system is in parallel with storage battery, powers to the load.
As further improvement of the utility model, the voltage of described storage battery is DC bus-bar voltage.
As further improvement of the utility model, described power inverter is bidirectional DC-DC converter, and its topology is non-isolated half-bridge structure.
As further improvement of the utility model, described bidirectional DC-DC converter adopts Modified Filter power dividing control strategy.
The beneficial effects of the utility model are:
1, in active structure composite power supply, super capacitor electrode is pressed in energy steady operation when meeting the dynamic load conversion, has played the effect of accessory power supply; In the situation that the load pulsation, in active structure composite power supply, the discharging current of storage battery is more level and smooth, and its discharge process has obtained optimization, and cycle life is extended; Bidirectional DC-DC converter is controlled successful, and validity is high;
2, power inverter adopts bidirectional DC-DC converter, and topology is non-isolated half-bridge structure, and this structural elements number of devices is few, cheap, there is no transformer loss, and efficiency is high, is easy to packing and integrated.
Description of drawings
Fig. 1 is that the utility model is controlled the circuit theory diagrams of Hybrid Vehicle composite power source based on the Modified Filter power dividing;
Fig. 2 is rectangular pulse frequency domain figure;
Fig. 3 is the circuit theory diagrams of bidirectional DC-DC converter in the utility model;
Fig. 4 is Modified Filter power dividing control strategy figure.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Fig. 1 is that the utility model is controlled the circuit theory diagrams of Hybrid Vehicle composite power source based on the Modified Filter power dividing, wherein:
For storage battery,
For the internal resistance of storage battery,
For ultracapacitor,
For the internal resistance of ultracapacitor,
For the pulse current load.This structure is that ultracapacitor is in parallel with storage battery by power inverter (DC-DC),, due to the unsteady flow effect of power inverter, can control the charging and discharging currents of storage battery, thereby improves the performance of composite power source.According to actual conditions, power inverter can be set to step-down and boost type, so that storage battery and ultracapacitor are carried out voltage matches.
Active structure composite power flow-dividing control thought is to make ultracapacitor rely on the advantage of its high power density, mainly bears the flutter component in load current.Storage battery, because its energy density is higher, is mainly born the average weight in load current.This control thought can be explained by Fig. 2.Fig. 2 is divided into three zones, and 1 zone is near 0Hz, and the average current component in expression load output current, born by batteries; 2 zones and 3 zones all represent the flutter component in load current, and difference is that the pulse current impact amplitude in 2 zones is larger, therefore by bank of super capacitors, is born; And the dynamic current in 3 zones impact amplitude is smaller, by some filter capacitors, is born.
Fig. 3 is the circuit theory diagrams of bidirectional DC-DC converter in the utility model, wherein:
With
Represent respectively storage battery and ultracapacitor both end voltage,
With
The filter capacitor that represents respectively ultracapacitor and accumulator terminal,
For inductance,
With
For
,
,
With
Form bidirectional DC-DC converter.Bidirectional DC-DC converter can be realized two quadrant operations, and namely converter both end voltage direction is constant, and the sense of current changes, and is equivalent to the combination of buck converter and boost converter on function.Work as switching tube
With certain duty ratio switch,
During for fly-wheel diode, converter is equivalent to the buck converter, energy by
Flow to
, ultracapacitor absorbs energy.In like manner, work as switching tube
With certain duty ratio switch,
During for fly-wheel diode, converter is equivalent to the boost converter, energy by
Flow to
, ultracapacitor releases energy.
In Fig. 4, the flutter component in linear filter filtering load current, but within the independent use of filter can not guarantee that ultracapacitor is operated in safe voltage range.Therefore need to improve FILTER TO CONTROL, by increasing a non-linear voltage, control, adjust in real time the electric current and voltage control command, can effectively keep within ultracapacitor voltage is operated in stable scope.Complete control algolithm is:
Wherein
For the ultracapacitor voltage control factor,
The linear revise item.
Modified Filter power dividing control strategy is by the ultracapacitor voltage control factor
(
Thereby) decay load current further control ultracapacitor voltage.According to current polarity,
Two kinds of different effects are arranged: when nearly its maximum voltage of super capacitor electrode crimping, the ultracapacitor charge-current demands weakens, the corresponding enhancing of discharging current demand; In like manner, when nearly its minimum voltage of super capacitor electrode crimping, ultracapacitor discharging current demand weakens, the corresponding enhancing of charge-current demands.Can not depart from its burning voltage scope, linear revise item in order to ensure ultracapacitor voltage
Can voltage be withdrawn into its rated voltage (
).
Wherein,
For the ultracapacitor virtual voltage;
Be a constant, the acutance of the definition voltage control factor.
The utility model is connected ultracapacitor and is formed the auxiliary energy storage system with power inverter, again that the auxiliary energy storage system is in parallel with storage battery, thereby power to the load, battery tension is DC bus-bar voltage, the abundant absorption peak power of power inverter and ultracapacitor.Power inverter adopts bidirectional DC-DC converter, and topology is non-isolated half-bridge structure, and this structural elements number of devices is few, cheap, there is no transformer loss, and efficiency is high, is easy to packing and integrated.Bidirectional DC-DC converter can be realized two quadrant operations, and namely converter both end voltage direction is constant, and the sense of current changes, and is equivalent to the combination of buck converter and boost converter on function.The control strategy of DC-DC converter is that the Modified Filter power dividing is controlled.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (4)
1. control the Hybrid Vehicle composite power source based on the Modified Filter power dividing, it is characterized in that: comprise ultracapacitor, power inverter and storage battery, described ultracapacitor is connected with power inverter and is formed the auxiliary energy storage system, described auxiliary energy storage system is in parallel with storage battery, powers to the load.
2. according to claim 1 based on Modified Filter power dividing control Hybrid Vehicle composite power source, it is characterized in that: the voltage of described storage battery is DC bus-bar voltage.
3. according to claim 1 it is characterized in that: described power inverter is bidirectional DC-DC converter based on Modified Filter power dividing control Hybrid Vehicle composite power source, and its topology is non-isolated half-bridge structure.
4. according to claim 3 based on Modified Filter power dividing control Hybrid Vehicle composite power source, it is characterized in that: described bidirectional DC-DC converter adopts Modified Filter power dividing control strategy.
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| CN2013203390221U CN203301211U (en) | 2013-06-14 | 2013-06-14 | A composite power supply for hybrid electric vehicles based on an improved filter power dividing control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312020A (en) * | 2013-06-14 | 2013-09-18 | 江苏大学 | Hybrid power system based on improved filter power split control for hybrid electric vehicle |
| CN104300660A (en) * | 2014-10-13 | 2015-01-21 | 柳州惠林科技有限责任公司 | Composite power supply management system |
| CN109076685A (en) * | 2016-04-25 | 2018-12-21 | 松下知识产权经营株式会社 | For operating the operation circuit and method of at least one light source |
| CN109450063A (en) * | 2018-11-15 | 2019-03-08 | 江苏理工学院 | Electric car composite power source power distribution control method based on bandwidth |
-
2013
- 2013-06-14 CN CN2013203390221U patent/CN203301211U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312020A (en) * | 2013-06-14 | 2013-09-18 | 江苏大学 | Hybrid power system based on improved filter power split control for hybrid electric vehicle |
| CN103312020B (en) * | 2013-06-14 | 2016-04-27 | 江苏大学 | Hybrid Vehicle composite power source is controlled based on Modified Filter power dividing |
| CN104300660A (en) * | 2014-10-13 | 2015-01-21 | 柳州惠林科技有限责任公司 | Composite power supply management system |
| CN109076685A (en) * | 2016-04-25 | 2018-12-21 | 松下知识产权经营株式会社 | For operating the operation circuit and method of at least one light source |
| CN109450063A (en) * | 2018-11-15 | 2019-03-08 | 江苏理工学院 | Electric car composite power source power distribution control method based on bandwidth |
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