CN103312020A - Hybrid power system based on improved filter power split control for hybrid electric vehicle - Google Patents
Hybrid power system based on improved filter power split control for hybrid electric vehicle Download PDFInfo
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- CN103312020A CN103312020A CN2013102343321A CN201310234332A CN103312020A CN 103312020 A CN103312020 A CN 103312020A CN 2013102343321 A CN2013102343321 A CN 2013102343321A CN 201310234332 A CN201310234332 A CN 201310234332A CN 103312020 A CN103312020 A CN 103312020A
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Abstract
The invention discloses a hybrid power system based on improved filter power split control for a hybrid electric vehicle. The hybrid power system comprises a supercapacitor, a power converter and a storage battery, the supercapacitor is connected with the power converter in series to form an auxiliary power storage system, the auxiliary power storage system is connected with the storage battery in parallel to supply power to a load, and voltage of the storage battery is direct-current bus voltage. The power converter is a bi-directional DC (direct current)-DC converter and the topological structure of the power converter is a non-isolated half-bridge structure, and an improved filter power split control strategy is adopted. With voltage meeting the requirement on dynamic load conversion, the supercapacitor in the hybrid power system can work stably and functions as an auxiliary power supply; under the condition of load pulsating, discharge current of the storage battery in the hybrid power supply is smoother, the discharge process of the storage battery is optimized, and cycle life is prolonged; the bi-directional DC-DC converter is obvious in control effect and high in effectiveness.
Description
Technical field
The present invention relates to a kind of composite power source, particularly a kind of based on modified model filter power flow-dividing control, storage battery and ultracapacitor combined constitutes 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 to accelerate and regenerative braking two aspects.At present, the energy storage system of most of hybrid vehicle is based on all that battery designs finishes, because the storage battery specific power is low, the short and cost height of cycle life has limited development and the application of hybrid vehicle to a great extent.At this problem, a common solution is exactly to reduce variable current to the demand of storage battery, thereby improves its performance and cycle life.For this reason, about having proposed several schemes in succession, the scholar comes to comprise flywheel energy storage, superconducting energy storage etc. for storage battery provides equally loaded.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 big and big characteristics of ultracapacitor specific power of storage battery specific energy combine, reduce simultaneously the deficiency of every kind of power supply to greatest extent, this brings very big 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 source 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) output current of optimization storage battery makes it level and smooth as far as possible, thus the cycle life that prolongs storage battery.Therefore, the overall performance of active structure composite power source is more superior than passive type structure.
Summary of the invention
In order to overcome the deficiency of passive type structure composite power source: storage battery, ultracapacitor must keep lacking in terminal voltage unanimity, the design flexibility, terminal voltage along with charge and discharge process changes greatly, influence loaded work piece performance etc., and the defective of active structure composite power source power 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., the invention provides a kind of Hybrid Vehicle composite power source solution based on modified model filter power flow-dividing control.
Technical scheme of the present invention is:
Based on modified model filter power flow-dividing control Hybrid Vehicle composite power source, comprise ultracapacitor, power inverter and storage battery, described ultracapacitor is connected with power inverter and is constituted the auxiliary energy storage system, and described auxiliary energy storage system is in parallel with storage battery, powers to the load.
As a further improvement on the present invention, the voltage of described storage battery is DC bus-bar voltage.
As a further improvement on the present invention, described power inverter is bidirectional DC-DC converter, and its topology is non-isolated half-bridge structure.
As a further improvement on the present invention, described bidirectional DC-DC converter adopts modified model filter power flow-dividing control strategy.
The invention has the beneficial effects as follows:
1, super capacitor electrode is pressed in energy steady operation when satisfying the dynamic load conversion in the active structure composite power source, has played the effect of accessory power supply; Under the situation of load pulsation, the discharging current of storage battery is more level and smooth in the active structure composite power source, and its discharge process has obtained optimization, and cycle life obtains prolonging; Bidirectional DC-DC converter control effect is obvious, the validity height;
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, does not have transformer loss, and the efficient height is easy to packing and integrated.
Description of drawings
Fig. 1 is the circuit theory diagrams that the present invention is based on modified model filter power flow-dividing control Hybrid Vehicle composite power source;
Fig. 2 is rectangular pulse frequency domain figure;
Fig. 3 is the circuit theory diagrams of bidirectional DC-DC converter among the present invention;
Fig. 4 is modified model filter power flow-dividing control policy map.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 1 is the circuit theory diagrams that the present invention is based on modified model filter power flow-dividing control Hybrid Vehicle composite power source, wherein:
Be storage battery,
Be the internal resistance of storage battery,
Be ultracapacitor,
Be the internal resistance of ultracapacitor,
Be the pulse current load.This structure is that ultracapacitor is in parallel with storage battery by power inverter (DC-DC), because the unsteady flow effect of power inverter can be controlled the charging and discharging of accumulator electric current, 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 source power dividing control thought is to make ultracapacitor rely on the advantage of its high power density, mainly bears the flutter component in the load current.Storage battery is mainly born the average weight in the load current because its energy density is higher.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 the expression load output current is born by batteries; The flutter component in the load current is all represented in 2 zones and 3 zones, and difference is that the pulse current impact amplitude in 2 zones is bigger, is therefore born by bank of super capacitors; And the dynamic current in 3 zones impact amplitude is smaller, is then born by some filter capacitors.
Fig. 3 is the circuit theory diagrams of bidirectional DC-DC converter among the present invention, wherein:
With
Represent storage battery and ultracapacitor both end voltage respectively,
With
The filter capacitor of representing ultracapacitor and storage battery end respectively,
Be inductance,
With
For
,
,
With
Constitute bidirectional DC-DC converter.Bidirectional DC-DC converter can be realized the operation of two quadrants, 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 in function.Work as switching tube
With certain duty ratio switch,
During for fly-wheel diode, the converter equivalence is 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, the converter equivalence is the boost converter, energy by
Flow to
, ultracapacitor releases energy.
In Fig. 4, the flutter component in the linear filter filtering load current, but the independent use of filter can not guarantee that ultracapacitor is operated within the safe voltage range.Therefore need improve FILTER TO CONTROL, by increasing a non-linear voltage control, adjust the electric current and voltage control command in real time, can keep ultracapacitor voltage to be operated within the stable scope effectively.Complete control algolithm is:
Wherein
Be the ultracapacitor voltage control factor,
Linear correction term.
Modified model filter power flow-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 correction term in order to ensure ultracapacitor voltage
Can voltage be withdrawn into its rated voltage (
).
Wherein,
Be the ultracapacitor virtual voltage;
Be a constant, the acutance of the definition voltage control factor.
The present invention connects ultracapacitor and constitutes 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, does not have transformer loss, and the efficient height is easy to packing and integrated.Bidirectional DC-DC converter can be realized the operation of two quadrants, 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 in function.The control strategy of DC-DC converter is modified model filter power flow-dividing control.
The above only is 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., all should be included within protection scope of the present invention.
Claims (4)
1. based on modified model filter power flow-dividing control Hybrid Vehicle composite power source, it is characterized in that: comprise ultracapacitor, power inverter and storage battery, described ultracapacitor is connected with power inverter and is constituted 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 model filter power flow-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 model filter power flow-dividing control Hybrid Vehicle composite power source, and its topology is non-isolated half-bridge structure.
4. according to claim 3 based on modified model filter power flow-dividing control Hybrid Vehicle composite power source, it is characterized in that: described bidirectional DC-DC converter adopts modified model filter power flow-dividing control strategy.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516039A (en) * | 2013-09-23 | 2014-01-15 | 深圳市华为技术软件有限公司 | System and method for graded power supply |
| CN103872729A (en) * | 2014-03-06 | 2014-06-18 | 江苏大学 | Hybrid electric vehicle composite power supply for self-adapting filter power dividing control and self-adapting filter power dividing control method |
| US9643513B2 (en) | 2014-12-08 | 2017-05-09 | General Electric Company | Propelling system and energy management system and methods |
| US9809119B2 (en) | 2015-01-13 | 2017-11-07 | General Electric Company | Bi-directional DC-DC power converter for a vehicle system |
| CN108539727A (en) * | 2018-04-09 | 2018-09-14 | 江苏理工学院 | A kind of hybrid energy-storing power supply being applied to renewable energy system from far-off regions |
| CN108667337A (en) * | 2018-05-31 | 2018-10-16 | 西南交通大学 | Highpowerpulse load power source device with fast dynamic response and its control method |
| CN108879920A (en) * | 2018-07-20 | 2018-11-23 | 江苏大学 | A kind of pressure photovoltaic cogeneration super capacitor energy storage control system |
| CN108879774A (en) * | 2018-07-20 | 2018-11-23 | 江苏大学 | A kind of pressure photovoltaic cogeneration exchange grid-connection control system |
| CN109066977A (en) * | 2018-08-08 | 2018-12-21 | 上海宇航系统工程研究所 | A kind of distribution aerospace craft intelligence power supply-distribution system |
| CN109888902A (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 Non-Linear Programming |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516039A (en) * | 2013-09-23 | 2014-01-15 | 深圳市华为技术软件有限公司 | System and method for graded power supply |
| CN103516039B (en) * | 2013-09-23 | 2015-11-25 | 深圳市华为技术软件有限公司 | A kind of classification electric power system and method |
| CN103872729A (en) * | 2014-03-06 | 2014-06-18 | 江苏大学 | Hybrid electric vehicle composite power supply for self-adapting filter power dividing control and self-adapting filter power dividing control method |
| US9643513B2 (en) | 2014-12-08 | 2017-05-09 | General Electric Company | Propelling system and energy management system and methods |
| US9809119B2 (en) | 2015-01-13 | 2017-11-07 | General Electric Company | Bi-directional DC-DC power converter for a vehicle system |
| CN108539727A (en) * | 2018-04-09 | 2018-09-14 | 江苏理工学院 | A kind of hybrid energy-storing power supply being applied to renewable energy system from far-off regions |
| CN108667337A (en) * | 2018-05-31 | 2018-10-16 | 西南交通大学 | Highpowerpulse load power source device with fast dynamic response and its control method |
| CN108667337B (en) * | 2018-05-31 | 2024-01-30 | 西南交通大学 | High-power pulse load power supply device with rapid dynamic response and control method thereof |
| CN108879920A (en) * | 2018-07-20 | 2018-11-23 | 江苏大学 | A kind of pressure photovoltaic cogeneration super capacitor energy storage control system |
| CN108879774A (en) * | 2018-07-20 | 2018-11-23 | 江苏大学 | A kind of pressure photovoltaic cogeneration exchange grid-connection control system |
| CN109066977A (en) * | 2018-08-08 | 2018-12-21 | 上海宇航系统工程研究所 | A kind of distribution aerospace craft intelligence power supply-distribution system |
| CN109066977B (en) * | 2018-08-08 | 2021-09-28 | 上海宇航系统工程研究所 | Distributed intelligent power supply and distribution system for aerospace vehicle |
| CN109888902A (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 Non-Linear Programming |
| CN109888902B (en) * | 2019-01-14 | 2020-07-28 | 江苏理工学院 | Vehicle-mounted hybrid power supply energy management control method based on nonlinear programming |
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| CN103312020B (en) | 2016-04-27 |
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