CN103872729A - Hybrid electric vehicle composite power supply for self-adapting filter power dividing control and self-adapting filter power dividing control method - Google Patents
Hybrid electric vehicle composite power supply for self-adapting filter power dividing control and self-adapting filter power dividing control method Download PDFInfo
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- CN103872729A CN103872729A CN201410080123.0A CN201410080123A CN103872729A CN 103872729 A CN103872729 A CN 103872729A CN 201410080123 A CN201410080123 A CN 201410080123A CN 103872729 A CN103872729 A CN 103872729A
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- power
- ultracapacitor
- adapting filter
- dividing control
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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Abstract
The invention discloses a hybrid electric vehicle composite power supply for self-adapting filter power dividing control and a self-adapting filter power dividing control method. The composite power supply comprises a storage battery, a super capacitor and a bidirectional DC/DC (Direct Current/Direct Current) convertor, wherein the storage battery is connected with a power bus to be used as a main power supply; the super capacitor is connected with the power bus by the bidirectional DC/DC converter and is connected with the bidirectional DC/DC converter in series to form an auxiliary power supply. The self-adapting filter power dividing control method is used for controlling the bidirectional DC/DC converter. The super capacitor in the composite power supply is used for carrying out power compensation on the storage battery so as to prevent from providing instantaneous power and peak power by the battery; the whole efficiency of the composite power supply is obviously improved; the super capacitor can be used for rapidly and efficiently charging and discharging by large current and regenerative braking energy is recycled to the greatest extent; the self-adapting filter power dividing control method realizes the reasonable distribution of power, guarantees that all parts of the composite power supply are efficient obtains the good control effect.
Description
Technical field
The present invention relates to energy storage device and control method thereof that one is applied to hybrid vehicle (HEV), be particularly related to a kind ofly by storage battery and the ultracapacitor formation composite power source that combines, and composite power source adopts the hybrid electric vehicle composite power source of sef-adapting filter power dividing control method.
Background technology
Due to the intensification day by day of the day by day serious and energy crisis of environmental pollution, hybrid vehicle has developed into a kind of inexorable trend by means of the advantage of its energy-saving and environmental protection.The core of hybrid vehicle environmental protection and energy saving theory is to utilize energy-storage system to carry out " peak load shifting " to operating mode demand power, and the kinetic energy while reclaiming braking, makes whole dynamical system efficiency higher.In more than ten years in the past, hybrid vehicle (HEV) has obtained good development in commercial and civilian.
However, the performance of hybrid vehicle and the scope of application still do not reach the orthodox car take natural gas as power source.The reason that causes this problem is that energy-storage system of accumulator specific power is lower, cycle life is short, when being mainly reflected in HEV at instantaneous starting and accelerating, battery is difficult to meet load high power density demand and energy during in fast braking fully reclaims, thereby has limited the fast development of HEV.For this reason, being necessary to increase accessory power supply provides peak power and reclaims fast braking energy.Ultracapacitor relies on its high-specific-power and has extended cycle life is optimal selection undoubtedly, storage battery and ultracapacitor are mixed to use formation composite power source, can give full play to both intrinsic advantages, limit to greatest extent the deficiency of single power supply simultaneously, will greatly improve the efficiency of HEV energy-storage system.
Summary of the invention
The problems referred to above that exist for the energy-storage system of accumulator of hybrid vehicle in prior art, the invention provides a kind of hybrid electric vehicle composite power source and method of sef-adapting filter power dividing control.This composite power source is made up of storage battery and ultracapacitor, for giving full play to ultracapacitor specific power greatly and the large advantage of storage battery specific energy, simultaneously dispatch in time ultracapacitor storage battery is carried out to power back-off in order to sail the variation of operating mode according to hybrid electric vehicle, between storage battery and ultracapacitor, add a DC/DC converter, by controlling conducting and the shutoff of DC/DC converter switches pipe, thereby realize the reasonable distribution of power between storage battery and ultracapacitor.
The technical solution adopted for the present invention to solve the technical problems is:
The hybrid electric vehicle composite power source of sef-adapting filter power dividing control, comprises storage battery, ultracapacitor and two-way DC/DC converter; Described storage battery is directly connected with power bus, as main power source; Described ultracapacitor is connected with power bus by two-way DC/DC converter, with bidirectional DC-DC converter accessory power supply in series.
Further, described bidirectional DC-DC converter adopts non-isolated half-bridge structure.
Further, the bidirectional DC-DC converter of described non-isolated half-bridge structure comprises with resistive
filter inductance
, power switch pipe
and power switch pipe
.Filter inductance
and power switch pipe
after series connection, be connected to the positive pole of ultracapacitor and storage battery, power switch pipe
one end and filter inductance
output be connected, the other end is connected with the negative pole of ultracapacitor and storage battery, the electric current of described storage battery and ultracapacitor can be
,
with
between two-way flow.
The sef-adapting filter power dividing control method of the hybrid electric vehicle composite power source of sef-adapting filter power dividing control, described bidirectional DC-DC converter adopts sef-adapting filter power dividing control method., according to the variation of ultracapacitor parameter, by low pass filter time constant
adaptively selected, loading demand power is divided into two parts, peak power and average power; Loading demand power obtains average power after low pass filter, and average power is provided by storage battery; Loading demand power and average power are subtracted each other and obtained peak power, and peak power is provided by ultracapacitor.
Further, described time constant
adaptive selection method be: first, by the output voltage of ultracapacitor
with its reference voltage
compare, generate the pulse-modulated signal of power ratio control converter; Then, apply an electric current and correct link.
Further, described electric current rectification link is: first, get the operating current of ultracapacitor
with its reference current
compare; Secondly, introducing operating mode and state-of-charge (SOC), as correcting link, obtain target SOC by the relation of ultracapacitor SOC and operating mode, then compare with actual SOC, regulate and obtain electric current rectification link through PI.
The invention has the beneficial effects as follows:
Ultracapacitor has given full play to that its power density is large, the advantage of fast charging and discharging in the hybrid electric vehicle composite power source of sef-adapting filter power dividing control of the present invention, compensate widely the required peak power of load, avoided battery that instantaneous power and peak power are provided, the whole efficiency of composite power source significantly improves; In addition, ultracapacitor is high current charge-discharge quickly and efficiently, absorb to greatest extent regenerating braking energy, save widely the energy, Battery recycling energy is less, has reduced like this cycle charge-discharge number of times of storage battery, has avoided the heavy current impact to storage battery, extend the useful life of storage battery, put forward high-octane utilance.Sef-adapting filter power dividing control method of the present invention makes ultracapacitor mainly bear the peak power in bearing power, storage battery is mainly born average power, thereby realize the power back-off of ultracapacitor to storage battery and the reasonable distribution of power, guarantee that the each parts of composite power source are all than more efficient, obtain good control effect, the cycle life that has extended storage battery.
Accompanying drawing explanation
Fig. 1 is the structure chart of the hybrid electric vehicle composite power source of sef-adapting filter power dividing control of the present invention;
Fig. 2 is the structure chart of two-way DC/DC converter in composite power source;
Fig. 3 is sef-adapting filter power dividing control block diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
The structure of the hybrid electric vehicle composite power source of sef-adapting filter power dividing control of the present invention as shown in Figure 1, comprises storage battery, ultracapacitor and DC/DC converter.Storage battery specific energy is larger, and it is directly connected with power bus, provides the average power in bearing power as main power source; Because ultracapacitor specific power is larger, passed through DC/DC converter and be connected with power bus, with DC-DC converter accessory power supply in series, mainly provide the peak power in bearing power.The benefit of this structure is that storage battery determines busbar voltage, directly external power output, and energy conversion efficiency is high; And ultracapacitor regulates self voltage to mate work with battery by DC/DC converter automatically, has effectively protected storage battery.Because the change in voltage of battery is milder, therefore regulating and controlling voltage is more prone to realize.Composite power source should be realized the energy supply to load, the regenerated energy simultaneously also will fully reclaim hybrid vehicle braking time, and therefore DC/DC converter is selected two-way DC/DC converter.For the power division of storage battery in composite power source and ultracapacitor, after all, inject this process of electric current more or less in the duty ratio by regulating two-way DC/DC converter in to ultracapacitor and carry out.
The structure of above-mentioned two-way DC/DC converter as shown in Figure 2, wherein,
with
be respectively electric current and the voltage of ultracapacitor;
with
be respectively electric current and the voltage of storage battery;
with
for power switch pipe;
for with resistive
filter inductance.Bidirectional DC-DC converter adopts non-isolated half-bridge structure, comprises with resistive
filter inductance
, power switch pipe
and power switch pipe
.Filter inductance
and power switch pipe
after series connection, be connected to the positive pole of ultracapacitor and storage battery, power switch pipe
one end and filter inductance
output be connected, the other end is connected with the negative pole of ultracapacitor and storage battery, the electric current of described storage battery and ultracapacitor can be
,
with
between two-way flow, in Fig. 2, bidirectional DC-DC converter can be realized two quadrants operations, converter both end voltage direction is constant, the sense of current changes, and is equivalent to the combination of booster converter and buck converter in function.If
for opening the cycle of switching tube,
for duty ratio, when
when shutoff,
?
open-minded in time, ultracapacitor releases energy; Equally, when
while opening,
turn-off time be
, ultracapacitor absorbs energy.This structural elements number of devices is few, cheap, there is no transformer loss, and efficiency is high, is easy to packing and integrated.
The sef-adapting filter power dividing control method of the hybrid electric vehicle composite power source of sef-adapting filter power dividing control of the present invention as shown in Figure 3, wherein,
with
be respectively the power of ultracapacitor and the power of storage battery;
for the time constant of low pass filter;
for the state-of-charge of ultracapacitor;
for the reference value of ultracapacitor state-of-charge;
for the reference value of ultracapacitor voltage;
for the current reference value of ultracapacitor;
for the improvement factor of ultracapacitor electric current.In Fig. 3, the sef-adapting filter power dividing control method that bidirectional DC-DC converter adopts utilizes filter that bearing power is divided into two parts, peak power and average powers.Filter is got linear low-pass filters, and loading demand power obtains average power after low pass filter, and average power is mainly provided by storage battery; Take demand gross power and average power to subtract each other and just can obtain peak power, peak power is mainly provided by ultracapacitor.Filter time constant
setting be the core of control strategy, and ultracapacitor is the main object of control strategy, so right according to the variation of ultracapacitor parameter
carry out adaptively selected.By the output voltage of ultracapacitor
with its reference voltage
compare, generate the pulse-modulated signal of power ratio control converter.Be noted that this control strategy must apply one enough strong electric current correct link, thereby even if guarantee under the poorest loaded work piece condition, the output voltage of ultracapacitor can not exceed its range of nominal tension.First, get the operating current of ultracapacitor
with its reference current
compare; Secondly, in order to allow the composite power source demand of adaptation condition better, adaptively according to operating mode situation rational management ultracapacitor, introduce operating mode and SOC as correcting link, make the keep one's powder dry next running status of hybrid vehicle (HEV) of ultracapacitor.Such as, in the time that HEV is low speed driving, next state is likely acceleration, therefore, along with the reduction control DC/DC of the speed of a motor vehicle charges to ultracapacitor, ultracapacitor absorbs more energy, ready for accelerating; Or when HEV is in the time running at high speed, next state is likely braking, ultracapacitor should leave enough capacity and fully reclaim braking energy.Therefore, we obtain target SOC by the relation of ultracapacitor SOC and operating mode, then compare with actual SOC, regulate and obtain electric current rectification link through PI.It should be noted that working conditions change can be embodied in the variation of the speed of a motor vehicle.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. the hybrid electric vehicle composite power source of sef-adapting filter power dividing control, is characterized in that: comprise storage battery, ultracapacitor and two-way DC/DC converter; Described storage battery is directly connected with power bus, as main power source; Described ultracapacitor is connected with power bus by two-way DC/DC converter, with bidirectional DC-DC converter accessory power supply in series.
2. the hybrid electric vehicle composite power source of sef-adapting filter power dividing control according to claim 1, is characterized in that: described bidirectional DC-DC converter adopts non-isolated half-bridge structure.
3. the hybrid electric vehicle composite power source of sef-adapting filter power dividing control according to claim 2, is characterized in that: the bidirectional DC-DC converter of described non-isolated half-bridge structure comprises with resistive
filter inductance
, power switch pipe
and power switch pipe
; Filter inductance
and power switch pipe
after series connection, be connected to the positive pole of ultracapacitor and storage battery, power switch pipe
one end and filter inductance
output be connected, the other end is connected with the negative pole of ultracapacitor and storage battery, the electric current of described storage battery and ultracapacitor can be
,
with
between two-way flow.
4. the sef-adapting filter power dividing control method of the hybrid electric vehicle composite power source of sef-adapting filter power dividing control described in any one in claims 1 to 3, is characterized in that: described bidirectional DC-DC converter adopts sef-adapting filter power dividing control method; , according to the variation of ultracapacitor parameter, by low pass filter time constant
adaptively selected, loading demand power is divided into two parts, peak power and average power, loading demand power obtains average power after low pass filter, average power is provided by storage battery, loading demand power and average power are subtracted each other and obtained peak power, and peak power is provided by ultracapacitor.
5. the sef-adapting filter power dividing control method of the hybrid electric vehicle composite power source of sef-adapting filter power dividing control according to claim 4, is characterized in that: described time constant
adaptive selection method be: first, by the output voltage of ultracapacitor
with its reference voltage
compare, generate the pulse-modulated signal of power ratio control converter; Then, apply an electric current and correct link.
6. the sef-adapting filter power dividing control method of the hybrid electric vehicle composite power source of sef-adapting filter power dividing control according to claim 5, is characterized in that: described electric current is corrected link and is: first, get the operating current of ultracapacitor
with its reference current
compare; Secondly, introduce operating mode and state-of-charge SOC as correcting link, obtain target SOC, then compare with actual SOC by the relation of ultracapacitor SOC and operating mode, through PI, adjusting obtains electric current and corrects link.
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| CN109889131A (en) * | 2019-01-28 | 2019-06-14 | 江苏理工学院 | The suppressing method of electric car AC-battery power source drive system temperature effect |
| CN109878507A (en) * | 2019-01-14 | 2019-06-14 | 江苏理工学院 | Vehicle-mounted AC-battery power source energy management control method based on lambda factor |
| CN113771827A (en) * | 2021-08-30 | 2021-12-10 | 江苏大学 | Mode switching coordination control method of hybrid electric vehicle based on finite time state extended observer and time-lag compensation controller |
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| CN106712508A (en) * | 2015-11-13 | 2017-05-24 | 财团法人工业技术研究院 | power supply device and power supply method applied to cruise system |
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| CN109889131A (en) * | 2019-01-28 | 2019-06-14 | 江苏理工学院 | The suppressing method of electric car AC-battery power source drive system temperature effect |
| CN109889131B (en) * | 2019-01-28 | 2020-07-28 | 江苏理工学院 | Method for inhibiting temperature effect of hybrid power supply driving system of electric automobile |
| CN113771827A (en) * | 2021-08-30 | 2021-12-10 | 江苏大学 | Mode switching coordination control method of hybrid electric vehicle based on finite time state extended observer and time-lag compensation controller |
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