CN105790252A - Composite energy storage system and energy optimization control system thereof - Google Patents
Composite energy storage system and energy optimization control system thereof Download PDFInfo
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- CN105790252A CN105790252A CN201610235232.4A CN201610235232A CN105790252A CN 105790252 A CN105790252 A CN 105790252A CN 201610235232 A CN201610235232 A CN 201610235232A CN 105790252 A CN105790252 A CN 105790252A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/08—Three-wire systems; Systems having more than three wires
- H02J1/082—Plural DC voltage, e.g. DC supply voltage with at least two different DC voltage levels
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an energy optimization control system of a composite energy storage system. The energy optimization control system comprises an acquisition module and a calculation module, wherein the acquisition module is used for acquiring input current, output current, output voltage and virtual impedance of a corresponding DC/DC converter in the composite energy storage system; and the calculation module is used for acquiring a pulse width adjusting signal according to the virtual impedance, the input current, the output current, a reference voltage value and the output voltage, and outputting the pulse width adjusting signal to a switching device of the corresponding DC/DC converter. The energy optimization control system reflects different frequency response characteristics in response to different load changes through setting different virtual impedance types, can achieve coordination control of different energy storage elements, and can prolong the service life of an energy storage unit maximally on the premise of satisfying optimizing operation of the energy storage system; and since the virtual impedance can be determined according to the types of the energy storage elements, the types of the energy storage elements in the energy storage system can be increased conveniently, and the expandability of the energy storage elements in the energy storage system can be increased. Furthermore, the invention discloses the composite energy storage system.
Description
Technical field
The present invention relates to technical field of electric power, particularly relate to a kind of composite energy storage system and energy optimal control system thereof.
Background technology
In composite energy storage system, the parallel method of different energy-storage travelling wave tubes mainly has three kinds: passive type, semi-active type and active.Passive type parallel method is that energy-storage travelling wave tube is joined directly together with dc bus, it is achieved simple；But the power distribution between energy-storage travelling wave tube is only determined by internal resistance, and needs the voltage of energy-storage travelling wave tube identical with DC bus-bar voltage, it is therefore desirable to more energy-storage travelling wave tube, relatively costly.In semi-active type parallel method, part energy-storage travelling wave tube is connected with dc bus by DC/DC (DC-to-dc) changer and can carry out actively control, but the direct energy-storage travelling wave tube being connected with dc bus is still uncontrollable.
Current composite energy storage system many employings super capacitor and two kinds of energy-storage travelling wave tubes of battery are constituted, and wherein super capacitor is as power-type energy-storage travelling wave tube, and battery is as energy type energy-storage travelling wave tube；And the composite energy storage systematic research that forms for three kinds and above energy-storage travelling wave tube is less.
As can be seen here, how improving the autgmentability of energy-storage travelling wave tube and the mode of parallel connection in composite energy storage system is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
It is an object of the invention to provide a kind of composite energy storage system and energy optimal control system thereof, for improving the autgmentability of energy-storage travelling wave tube in composite energy storage system and the mode of parallel connection.
For solving above-mentioned technical problem, the present invention provides a kind of composite energy storage system and energy optimal control system thereof, including:
Acquisition module, for obtaining the input current of DC/DC changer corresponding in composite energy storage system, output electric current, output voltage and virtual impedance；
Computing module, obtains impedance voltage drop value for described virtual impedance and described output electric current are done multiplying；Reference voltage level and described impedance voltage drop value are done subtraction, then does subtraction with input voltage and obtain the first intermediate value；Described first intermediate value is done proportional integral computing and obtains the second intermediate value；Described second intermediate value and described output electric current are done subtraction and obtains the 3rd intermediate value；Described 3rd intermediate value is done proportional integral computing and obtains the 4th intermediate value；Described 4th intermediate value and carrier wave input value are done subtraction and obtains pulse width modulating signal, and by the switching device of described pulse width modulating signal output to corresponding DC/DC changer；
Wherein, described virtual impedance is determined according to the type of the energy-storage travelling wave tube being connected with described DC/DC changer.
Preferably, when described energy-storage travelling wave tube is ferric phosphate lithium cell, described virtual impedance is the form of virtual resistance series connection virtual inductor.
Preferably, when described energy-storage travelling wave tube is super capacitor, described virtual impedance is the form of virtual resistance series connection simulated capacitance.
Preferably, when described energy-storage travelling wave tube is lithium titanate battery, described virtual impedance is the form of virtual resistance.
A kind of composite energy storage system, including control system described above, and least one set energy-storage units, described energy-storage units includes energy-storage travelling wave tube and the DC/DC changer being connected with described energy-storage travelling wave tube；
Wherein, the first end of described DC/DC changer is connected with the positive pole of dc bus, and the second end of described DC/DC changer is connected with the negative pole of dc bus.
Preferably, including respectively the first energy-storage units of energy-storage units described in 3 groups, the second energy-storage units and the 3rd energy-storage units；
Wherein, described first energy-storage units includes ferric phosphate lithium cell and the DC/DC changer being connected with described ferric phosphate lithium cell；
Described second energy-storage units includes lithium titanate battery and the 2nd DC/DC changer being connected with described lithium titanate battery；
Described 3rd energy-storage units includes super capacitor and the 3rd DC/DC changer being connected with described super capacitor.
Composite energy storage system provided by the present invention and energy optimal control system thereof, calculate pulse width modulating signal according to the virtual impedance of DC/DC changer corresponding in composite energy storage system, input current and output electric current and reference voltage level, output voltage and carrier wave input value.Just can regulate DC bus system reach power-balance by pulse width modulating signal being applied to the switching device of DC/DC changer of correspondence.Reflect that different Frequency Responses responds different load change intuitively by arranging difference " virtual impedance " type, the coordination that can realize different energy-storage travelling wave tube controls, and is meeting the life-span that can extend energy-storage units on the basis that energy-storage system optimization runs to greatest extent.Additionally, due to virtual impedance can be determined according to the type of the energy-storage travelling wave tube in composite energy storage system, therefore in energy-storage system, energy-storage travelling wave tube type can conveniently increase, and improves the autgmentability of energy-storage travelling wave tube in composite energy storage system.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention, the accompanying drawing used required in embodiment will be done simple introduction below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure chart of a kind of composite energy storage system provided by the invention and energy optimal control system thereof；
Fig. 2 is that a kind of control system provided by the invention is in the structure chart of composite energy storage system；
Fig. 3 is a kind of energy-storage travelling wave tube provided by the invention is the control figure of the composite energy storage system that ferric phosphate lithium cell is corresponding；
Fig. 4 is a kind of energy-storage travelling wave tube provided by the invention is the control figure of the composite energy storage system that super capacitor is corresponding；
Fig. 5 is a kind of energy-storage travelling wave tube provided by the invention is the control figure of the composite energy storage system that lithium titanate battery is corresponding；
Fig. 6 is the structure chart of a kind of composite energy storage system provided by the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art under not making creative work premise, the every other embodiment obtained, broadly fall into scope.
The core of the present invention is to provide control method and the composite energy storage system of a kind of composite energy storage system.
In order to make those skilled in the art be more fully understood that the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment one
Fig. 1 is the structure chart of the energy optimal control system of a kind of composite energy storage system provided by the invention.As it is shown in figure 1, the energy optimal control system 10 of composite energy storage system includes:
Acquisition module 100, for obtaining the input current of DC/DC changer 11 corresponding in composite energy storage system, output electric current, output voltage and virtual impedance；
Computing module 101, obtains impedance voltage drop value for virtual impedance and input current are done multiplying；Reference voltage level and described impedance voltage drop value are done subtraction, then does subtraction with input voltage and obtain the first intermediate value；First intermediate value is done proportional integral computing and obtains the second intermediate value；Second intermediate value is done subtraction with output electric current and obtains the 3rd intermediate value；3rd intermediate value is done proportional integral computing and obtains the 4th intermediate value；4th intermediate value and carrier wave input value are done subtraction and obtains pulse width adjustment signal, and by the switching device of pulse width adjustment signal output to corresponding DC/DC changer；
Wherein, virtual impedance is determined according to the type of the energy-storage travelling wave tube 12 being connected with DC/DC changer 11.
In order to allow those skilled in the art more understand control system provided by the invention, concrete application scenarios given below.
Fig. 2 is that a kind of control system provided by the invention is in the structure chart of composite energy storage system.As in figure 2 it is shown, UinFor energy-storage travelling wave tube voltage, CdFor with energy-storage travelling wave tube UinFirst electric capacity in parallel, inductance LfWith the first electric capacity CdSeries connection, the first switch transistor T1By inductance LfWith the first electric capacity CdParallel connection, second switch pipe T2With inductance LfSeries connection, the second electric capacity C passes through second switch pipe T2With the first switch transistor T1Parallel connection, the two ends of the second electric capacity C are connected with positive pole and the negative pole of dc bus as the first end and second end of DC/DC changer 11.In being embodied as, the acquisition module 100 controlling system obtains the input current i of DC/DC changer 11l, output electric current idc, output voltage UoAnd virtual impedance.Computing module 101 is first according to output electric current idcAn impedance voltage drop value is calculated, then by reference voltage U with virtual impedancerefDo subtraction, then with output voltage U0Do subtraction and obtain the first intermediate value.First intermediate value is done proportional integral computing and obtains the second intermediate value, by the second intermediate value and output electric current ilDo subtraction and obtain the 3rd intermediate value；3rd intermediate value is done proportional integral computing and obtains the 4th intermediate value；4th intermediate value and carrier wave input value are done subtraction and obtains pulse width adjustment signal PWM, and by the first switch transistor T of pulse width adjustment signal PWM output to corresponding DC/DC changer 111Or second switch pipe T2.In the present invention, DC/DC changer 11 be can the DC-DC transfer circuit of step-up/down, the first switch transistor T1It is operated in boost mode, second switch pipe T2It is operated in decompression mode.First switch transistor T1Or second switch pipe T2Can be any one of the devices such as MOSFET, IGBT or SIC.
Additionally, the control system in the present invention can be completed by controller, for instance dsp controller or ARM chip etc..It is understood that the DC/DC changer mentioned in the present invention is all two-way.
Fig. 3 is a kind of energy-storage travelling wave tube provided by the invention is the control figure of the composite energy storage system that ferric phosphate lithium cell is corresponding.As it is shown on figure 3, as one preferred embodiment, when energy-storage travelling wave tube is ferric phosphate lithium cell B1, virtual impedance is the form of virtual resistance R series connection virtual inductor sL.
DC/DC changer 11 control block diagram corresponding to ferric phosphate lithium cell is as shown in Figure 3.Wherein " virtual impedance " is set to the form of virtual resistance R series connection virtual inductor sL, and it has the characteristic of low pass filter, can reduce the response speed of ferric phosphate lithium cell output electric current when load generation Spline smoothing, such that it is able to extend its service life；And due to virtual inductor sL when stable state inoperative, so ferric phosphate lithium cell can export bigger electric current during stable state.Meanwhile, the response speed of electric current and voltage-controlled stability can be regulated by the value of adjustment virtual resistance and virtual inductor.
Fig. 4 is a kind of energy-storage travelling wave tube provided by the invention is the control figure of the composite energy storage system that super capacitor is corresponding.As shown in Figure 4, as one preferred embodiment, when energy-storage travelling wave tube is super capacitor, virtual impedance is the form of virtual resistance R series connection simulated capacitance 1/sC.
DC/DC changer 11 control block diagram corresponding to super capacitor is as shown in Figure 4.Wherein " virtual impedance " is set to the form of virtual resistance R series connection simulated capacitance 1/sC, it has the characteristic of high pass filter, when load generation Spline smoothing, it can carry out the sudden change of load-responsive by output high-power, and owing to the existence of simulated capacitance makes its steady-state output power be zero, it is possible to make super capacitor UscSOC be unlikely to drop too low；Meanwhile, the response speed of electric current and voltage-controlled stability can be regulated by the value of adjustment virtual resistance R and simulated capacitance 1/sC.
Fig. 5 is a kind of energy-storage travelling wave tube provided by the invention is the control figure of the composite energy storage system that lithium titanate battery is corresponding.As it is shown in figure 5, as one preferred embodiment, when energy-storage travelling wave tube is lithium titanate battery B2, virtual impedance is the form of virtual resistance R.
DC/DC changer 11 control block diagram corresponding for lithium titanate battery B2 is as shown in Figure 5.Wherein " virtual impedance " is set to the form of virtual resistance R, in the transient process of load generation step, lithium titanate battery can with super capacitor distribution portion transient power, and lithium titanate battery B2 can with ferric phosphate lithium cell B1 distribution portion steady state power when stable state.Meanwhile, power distribution condition between lithium titanate battery B2 and ferric phosphate lithium cell B1 can be regulated by adjustment virtual resistance value.
The energy optimal control system of the composite energy storage system that the present embodiment provides, calculates pulse width adjustment signal according to the virtual impedance of DC/DC changer corresponding in composite energy storage system, input current and output electric current and reference voltage level, output voltage and carrier wave input value.Just can regulate DC bus system reach power-balance by pulse width adjustment signal being applied to the switching device of DC/DC changer of correspondence.Different Frequency Responses is reflected intuitively by arranging difference " virtual impedance " type, respond different load change, the coordination that can realize different energy-storage travelling wave tube controls, and is meeting the life-span that can extend energy-storage units on the basis that energy-storage system optimization runs to greatest extent.
Embodiment two
Fig. 6 is the structure chart of a kind of composite energy storage system provided by the invention.Composite energy storage system includes the control system 10 described in embodiment one and least one set energy-storage units, and energy-storage units includes energy-storage travelling wave tube 12 and the DC/DC changer 11 being connected with energy-storage travelling wave tube；
Wherein, the first end of DC/DC changer 11 is connected with the positive pole of dc bus, and the second end of DC/DC changer 11 is connected with the negative pole of dc bus.
Fig. 6 contains 3 groups of energy-storage units, respectively the first energy-storage units, the second energy-storage units and the 3rd energy-storage units；
Wherein, the first energy-storage units includes ferric phosphate lithium cell and the DC/DC changer being connected with ferric phosphate lithium cell；
Second energy-storage units includes lithium titanate battery and the 2nd DC/DC changer being connected with lithium titanate battery；
3rd energy-storage units includes super capacitor and the 3rd DC/DC changer being connected with super capacitor.
Can with energy-storage units one_to_one corresponding it should be noted that control system 10, it is also possible to completed by a control system 10.
Above composite energy storage system provided by the present invention and energy optimal control system thereof are described in detail.In description, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to.For system disclosed in embodiment, owing to it corresponds to the method disclosed in Example, so what describe is fairly simple, relevant part illustrates referring to method part.It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to the present invention carries out some improvement and modification, these improve and modify in the protection domain also falling into the claims in the present invention.
Professional further appreciates that, the unit of each example described in conjunction with the embodiments described herein and algorithm steps, can with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate the interchangeability of hardware and software, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel specifically can should be used for using different methods to realize described function to each, but this realization is it is not considered that beyond the scope of this invention.
The method described in conjunction with the embodiments described herein or the step of algorithm can directly use the software module that hardware, processor perform, or the combination of the two is implemented.Software module can be placed in any other form of storage medium known in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technical field.
Claims (6)
1. the energy optimal control system of a composite energy storage system, it is characterised in that including:
Acquisition module, for obtaining the input current of DC/DC changer corresponding in composite energy storage system, output electric current, output voltage and virtual impedance；
Computing module, obtains impedance voltage drop value for described virtual impedance and described output electric current are done multiplying；Reference voltage level and described impedance voltage drop value are done subtraction, then does subtraction with input voltage and obtain the first intermediate value；Described first intermediate value is done proportional integral computing and obtains the second intermediate value；Described second intermediate value and described output electric current are done subtraction and obtains the 3rd intermediate value；Described 3rd intermediate value is done proportional integral computing and obtains the 4th intermediate value；Described 4th intermediate value and carrier wave input value are done subtraction and obtains pulse width modulating signal, and by the switching device of described pulse width modulating signal output to corresponding DC/DC changer；
Wherein, described virtual impedance is determined according to the type of the energy-storage travelling wave tube being connected with described DC/DC changer.
2. control system according to claim 1, it is characterised in that when described energy-storage travelling wave tube is ferric phosphate lithium cell, described virtual impedance is the form of virtual resistance series connection virtual inductor.
3. control system according to claim 1, it is characterised in that when described energy-storage travelling wave tube is super capacitor, described virtual impedance is the form of virtual resistance series connection simulated capacitance.
4. control system according to claim 1, it is characterised in that when described energy-storage travelling wave tube is lithium titanate battery, described virtual impedance is the form of virtual resistance.
5. a composite energy storage system, it is characterised in that include the control system described in Claims 1-4 any one and least one set energy-storage units, described energy-storage units includes energy-storage travelling wave tube and the DC/DC changer being connected with described energy-storage travelling wave tube；
Wherein, the first end of described DC/DC changer is connected with the positive pole of dc bus, and the second end of described DC/DC changer is connected with the negative pole of dc bus.
6. composite energy storage system according to claim 5, it is characterised in that include respectively the first energy-storage units of energy-storage units described in 3 groups, the second energy-storage units and the 3rd energy-storage units；
Wherein, described first energy-storage units includes ferric phosphate lithium cell and the DC/DC changer being connected with described ferric phosphate lithium cell；
Described second energy-storage units includes lithium titanate battery and the 2nd DC/DC changer being connected with described lithium titanate battery；
Described 3rd energy-storage units includes super capacitor and the 3rd DC/DC changer being connected with described super capacitor.
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| CN108306280A (en) * | 2018-01-31 | 2018-07-20 | 湖南大学 | A kind of hybrid energy-storing independently divides energy management method |
| CN110224435A (en) * | 2019-06-19 | 2019-09-10 | 广东志成冠军集团有限公司 | A kind of island power supply system capacity control method containing hybrid energy-storing |
| CN110649636A (en) * | 2019-10-12 | 2020-01-03 | 湖南工学院 | Method for inhibiting voltage oscillation of direct-current power system of multi-electric plane and virtual synchronous generator control device |
| CN112865153A (en) * | 2021-03-02 | 2021-05-28 | 阳光电源股份有限公司 | Energy storage system and capacity expansion method and control method thereof |
| CN115714371A (en) * | 2022-11-14 | 2023-02-24 | 国网湖北省电力有限公司武汉供电公司 | Multi-port converter stability control method based on virtual impedance |
| WO2023159926A1 (en) * | 2022-02-23 | 2023-08-31 | 华为数字能源技术有限公司 | Energy storage apparatus and power supply system |
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| CN108306280A (en) * | 2018-01-31 | 2018-07-20 | 湖南大学 | A kind of hybrid energy-storing independently divides energy management method |
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| CN115714371A (en) * | 2022-11-14 | 2023-02-24 | 国网湖北省电力有限公司武汉供电公司 | Multi-port converter stability control method based on virtual impedance |
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