CN106253264B - A kind of non-stream parallel connection direct conversion control apparatus and method - Google Patents
A kind of non-stream parallel connection direct conversion control apparatus and method Download PDFInfo
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- CN106253264B CN106253264B CN201610700025.1A CN201610700025A CN106253264B CN 106253264 B CN106253264 B CN 106253264B CN 201610700025 A CN201610700025 A CN 201610700025A CN 106253264 B CN106253264 B CN 106253264B
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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
Abstract
The invention discloses a kind of non-stream parallel connection direct conversion control apparatus and methods, including busbar and at least two DC energy sources, it is characterized in that, further include the two-way DC converter and control system of the identical quantity in DC energy source, the two-way DC converter is connect with busbar, one DC energy source corresponds to a two-way DC converter and a control system, and each DC energy source is connected in parallel after being connected in series with corresponding two-way DC converter with busbar；Control system is connect by PWM adjustment modules with two-way DC converter, which includes voltage regulator, low-pass filter and the current regulator being sequentially connected in series by circuit, and current regulator is connect by PWM module with two-way DC converter.The present invention carries out online filter weight coefficient adjustment according to energy source real-time power state and output feature, reaches the performance complement between different-energy source, to improve energy utilization efficiency, prolongs the service life, and enhances dynamic property.
Description
Technical field
It is non-equal in the case of specifically a kind of more DC energy sources the present invention relates to a kind of power electronics field
Flow control device and method.
Background technology
Energy-storage system is the important component of utilization of new energy resources.Such as in wind energy and solar power generation, due to wind energy and
Solar energy all has intermittent, fluctuation and uncontrollability, to ensure the continuity and balance of power supply, then must be introduced into storage
Energy system, to reach balance adjustment, peak load shifting and reduce the purpose of power grid impacts, and in new-energy automobile, especially
Pure electric automobile, then operation could be realized by having to rely on energy-storage system.
There are two typical index for energy-storage system tool, first, energy density, characterizes energy storage capability；Second is that power density,
Characterize power output capacity.In conventional energy-storage system, battery belongs to large energy density, but the phase in terms of power density
To poor energy storage device, if it is required to realize the power output of great fluctuation process range, the use longevity of battery will be seriously affected
Life and reliability.And super capacitor then belongs to relatively high power density, but storage energy is less, cannot achieve long-time energy
The energy storage device of output.It utilizes, i.e., carries out in multiple kinds of energy source simultaneously by converter if the energy source of different characteristic mixed
The needs of the complementation of aspect of performance then can be achieved, can both meet in terms of energy stores, the dynamic of power output also can be improved in connection output
Lithium battery and super capacitor are such as all applied in pure electric car, on the one hand utilize the energy storage capacity of lithium battery by state responding ability,
Course continuation mileage is improved, instantaneous power output, the input capability of super capacitor is on the one hand utilized, meets electric vehicle acceleration and deceleration
Can, and there is violent fluctuation in the power output that can avoid lithium battery, improves battery and reliability.
Although this polyergic source parallel system has the advantages that above-mentioned, in practical applications, technology is multipotency at present
Parallel current-sharing exports between amount source, can not be allocated to current/power, cannot achieve energy flow direction and effectively control, if
Polyergic source complementary application is played, then must be directed to the energy source of different characteristics, carry out the distribution to electric current and power output.
Invention content
The technical problem to be solved in the present invention is to provide a kind of electric current of different-energy source Parallel opertation system and power certainly
It adapts to the non-of distribution and flows parallel connection direct conversion control apparatus and method.
In order to solve the above-mentioned technical problem, the present invention takes following technical scheme：
A kind of non-stream parallel connection direct conversion control apparatus, including busbar and at least two DC energy sources, further include straight
The two-way DC converter and control system of the identical quantity in stream energy source, the two-way DC converter are connect with busbar, and one straight
Stream energy source corresponds to a two-way DC converter and a control system, each DC energy source are converted with corresponding bidirectional, dc
Device is connected in parallel after being connected in series with busbar；
Control system is connect by PWM adjustment modules with two-way DC converter, the control system include by circuit according to
The secondary voltage regulator being connected in series with, low-pass filter and current regulator, current regulator pass through PWM module and bidirectional, dc
Converter connects.
The DC energy source is DC energy storage unit, including battery class energy source, super capacitor or flywheel, battery class energy
Amount source includes lithium battery group, accumulator group, fuel cell or solar panel.
A kind of non-control method for flowing parallel connection direct conversion control apparatus, including at least one battery class energy source and one
A super capacitor, the described method comprises the following steps：
Step 1, the output of voltage regulator is the given value of current of current regulator, and low-pass filter low-limit frequency pair is arranged
The minimum filters factor alpha answeredl, the corresponding maximal filter factor alpha of low-pass filter highest frequencyh；
Step 2, the current conditions of current regulator are monitored, according to formula ierr=iref-ifedIt is calculated,
In, irefFor the given value of current of current regulator, ifedFor the current feedback of current regulator, ierrFor the electric current of current regulator
The given deviation between current feedback；
Step 3, to ierrValue judged, if ierrMore than predetermined threshold value, then the deposit of corresponding energy source is judged not
Foot increases current filter coefficients；If ierrLess than predetermined threshold value, then judges that the deposit of corresponding energy source is sufficient, keep current
Filter coefficient is constant, to adaptively be adjusted to the coefficient of low-pass filter.
The step 3 further includes：
Work as ierrLess than predetermined threshold value, when the deposit abundance of energy source, the electric current and power output of battery class energy source are kept
Change rate it is constant, reduce low pass filter cutoff frequency；Work as ierrIt played predetermined threshold value, when the under-reserve of energy source, then protected
Busbar voltage stabilization is held, the output of battery class energy source is improved, improves the cutoff frequency of filter.
The method further includes step：
Step 4, further judge that dynamic property, the given value of current change rate and voltage regulator of calculating current adjuster are defeated
Go out to become alternatively poor ideta, according to formula ideta=(iref(k)-iref(k-1))-(vout(k)-vout(k-1)) it is calculated, wherein
iref(k) it is current k moment given value of current, iref(k-1) it is (k-1) moment given value of current, vout(k) it is current k moment voltage tune
Save device output, vout(k-1) it is that current (k-1) moment voltage regulator exports；
If the i at current timedetaLess than the i of last momentdeta, then low pass filter cutoff frequency is improved；
Wherein low-pass filter uses the given value of current at following formula calculating current adjuster current time, iref(k)=α0vout(k)+α1iref(k-1)+...+αniref(k-n)αn, α0α1…αnFor filter coefficient, iref(k-n) it is (k-n) moment electricity
Stream is given.
Low-pass filter is added by the output end in voltage regulator in the present invention, realizes the differentiation of given value of current, root
According to energy source difference, using different filter weight coefficients, to reach the output of the electric current between different-energy source and power
Output.Meanwhile the low-pass filter is sef-adapting filter, can be carried out according to energy source real-time power state and output feature
Line filter coefficient adjustment, to improve energy utilization efficiency, extends and uses to reach the performance complement between different-energy source
Service life enhances dynamic property.
Description of the drawings
Attached drawing 1 is the connection diagram of apparatus of the present invention；
Attached drawing 2 is the principle process schematic diagram of the method for the present invention；
Attached drawing 3 is will low-pass filter difference coefficient is adjusted using the current regulator of different PI coefficients in invention signal
Figure；
Attached drawing 4 is not use the method for the present invention test result schematic diagram；
Attached drawing 5 is using test result schematic diagram after the method for the present invention.
Specific implementation mode
For the ease of the understanding of those skilled in the art, the invention will be further described below in conjunction with the accompanying drawings.
As shown in Fig. 1, present invention is disclosed it is a kind of it is non- flow parallel connection direct conversion control apparatus, including busbar and at least
Two DC energy sources further include the two-way DC converter and control system of the identical quantity in DC energy source, the bidirectional, dc
Converter is connect with busbar, and a DC energy source corresponds to a two-way DC converter and a control system, each direct current energy
Amount source is connected in parallel after being connected in series with corresponding two-way DC converter with busbar；Control system by PWM adjustment modules with
Two-way DC converter connects, which includes voltage regulator, the low-pass filter being sequentially connected in series by circuit
And current regulator, current regulator are connect by PWM module with two-way DC converter.Voltage regulator constitutes Voltage loop,
Current regulator constitutes electric current loop, and Voltage loop output is given value of current, is exported after adaptive low-pass filter to electric current loop,
As the given value of current of electric current loop.
The DC energy source is DC energy storage unit, including battery class energy source, super capacitor and flywheel, battery class energy
Amount source includes lithium battery group, accumulator group, fuel cell or solar panel.DC energy source amount can also include other forms
Or the energy source of type.
In addition, as shown in Fig. 2, this method further discloses a kind of non-controlling party for flowing parallel connection direct conversion control apparatus
Method, including battery class energy source and super capacitor, the described method comprises the following steps：
Step 1, the output of voltage regulator is the given value of current of current regulator, and low-pass filter low-limit frequency pair is arranged
The minimum filters factor alpha answeredl, the corresponding maximal filter factor alpha of low-pass filter highest frequencyh, the minimum filters coefficient
The boundary condition adjusted as adaptive low-pass filters weight coefficient with maximal filter coefficient.
Step 2, the current conditions of current regulator are monitored, according to formula ierr=iref-ifedIt is calculated,
In, irefFor the given value of current of current regulator, ifedFor the current feedback of current regulator, ierrFor the electric current of current regulator
The given deviation between current feedback；
Step 3, to ierrValue judged, if ierrMore than predetermined threshold value, then the deposit of corresponding energy source is judged not
Foot increases current filter coefficients；If ierrLess than predetermined threshold value, then judges that the deposit of corresponding energy source is sufficient, keep current
Filter coefficient is constant, to adaptively be adjusted to the coefficient of low-pass filter.According to the ierrIt can determine that DC energy
Whether the energy reserve in source is sufficient.
Work as ierrLess than predetermined threshold value, when the deposit abundance of energy source, the electric current and power output of battery class energy source are kept
Change rate it is constant, improve its service life and reliability, reduce low pass filter cutoff frequency；Work as ierrPredetermined threshold value was played,
When the under-reserve of energy source, then for the purpose of keeping busbar voltage to stablize, the characteristic of battery class energy source output is improved, is improved
The cutoff frequency of filter.
By solid line online to the adjustment of low-pass filter coefficients, different bandwidth low-pass filter is obtained, realizes voltage tune
Device output transform is saved, i.e. the online reallocation of given value of current realizes the non-stream output in different-energy source, to meet different-energy
The demand in source.If battery class energy source needs larger filtering, the wide variation of electric current and power output is avoided, to improve battery
Service life and reliability, then improve low pass filter cutoff frequency；And super capacitor then may be used it is smaller filtering or not
With filtering, low pass filter cutoff frequency can be reduced, to meet the dynamic need of electric current and power output.
The method further includes step：
Step 4, further judge that dynamic property, the given value of current change rate and voltage regulator of calculating current adjuster are defeated
Go out to become alternatively poor ideta, according to formula ideta=(iref(k)-iref(k-1))-(vout(k)-vout(k-1)) it is calculated, wherein
iref(k) it is current k moment given value of current, iref(k-1) it is (k-1) moment given value of current, vout(k) it is current k moment voltage tune
Save device output, vout(k-1) it is that current (k-1) moment voltage regulator exports；
If the i at current timedetaLess than the i of last momentdeta, then low pass filter cutoff frequency is improved；
Wherein low-pass filter uses the given value of current at following formula calculating current adjuster current time, iref(k)=α0vout(k)+α1iref(k-1)+...+αniref(k-n)αn, α0α1…αnFor filter coefficient, iref(k-n) it is (k-n) moment electricity
Stream is given.
In addition, as shown in Fig. 3, the electric current tune of different PI coefficients can be respectively adopted in the different weight coefficients of low-pass filter
Section device is adjusted, or symmetrical weight coefficient is adjusted using identical current regulator, such as low-pass filter coefficients α0
And αnFor symmetrical weight coefficient, an adjuster can be used, output is Δ α0If α0It is adjusted to α0+Δα0, then αnIt is adjusted to
αn-Δα0。
It is as shown in Figures 4 and 5 using the experimental result comparison after the method for the present invention, lithium battery and super is used in the experiment
Two kinds of energy source Fig. 4 of capacitance are to carry out acquisition experimental waveform in parallel using Voltage loop and electric current loop double-closed-loop control method, are deposited
Both ways the problem of, first, electric current is almost divided equally so that larger current fluctuation occurs in lithium battery, second is that capacitance current
It consumes larger so that it stores energy and cannot be satisfied system requirements, and the effect of super capacitor can not be played in rear half stage.Fig. 5
For using the experimental waveform after the method for the present invention, lithium battery current fluctuation is obviously reduced, and serves as main energy source, super
Capacitance mainly meets dynamic performance requirements, this purpose combined with lithium battery and super capacitor matches.
For ease of as it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, and
Not to limit the present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc.,
It should be included within protection scope of the present invention.
Claims (3)
1. a kind of non-control method for flowing parallel connection direct conversion control apparatus, including at least one battery class energy source and one
Super capacitor, which is characterized in that the described method comprises the following steps：
Step 1, the output of voltage regulator is the given value of current of current regulator, and setting low-pass filter low-limit frequency is corresponding
Minimum filters factor alphal, the corresponding maximal filter factor alpha of low-pass filter highest frequencyh；
Step 2, the current conditions of current regulator are monitored, according to formula ierr=iref-ifedIt is calculated, wherein
irefFor the given value of current of current regulator, ifedFor the current feedback of current regulator, ierrFor the given value of current of current regulator
Deviation between current feedback；
Step 3, to ierrValue judged, if ierrMore than predetermined threshold value, then the under-reserve of corresponding energy source is judged, increase
Add current filter coefficients；If ierrLess than predetermined threshold value, then judges that the deposit of corresponding energy source is sufficient, keep current filter
Device coefficient is constant, to adaptively be adjusted to the coefficient of low-pass filter.
2. the non-control method for flowing parallel connection direct conversion control apparatus according to claim 1, which is characterized in that described
Step 3 further includes：
Work as ierrLess than predetermined threshold value, when the deposit abundance of energy source, the change of the electric current and power output of battery class energy source is kept
Rate is constant, reduces low pass filter cutoff frequency；Work as ierrIt played predetermined threshold value, and when the under-reserve of energy source, then kept female
Line voltage is stablized, and improves the output of battery class energy source, improves the cutoff frequency of filter.
3. the non-control method for flowing parallel connection direct conversion control apparatus according to claim 2, which is characterized in that described
Method further includes step：
Step 4, further judge that dynamic property, given value of current change rate and the voltage regulator output of calculating current adjuster become
Alternatively poor ideta, according to formula ideta=(iref(k)-iref(k-1))-(vout(k)-vout(k-1)) it is calculated, wherein iref
(k) it is current k moment given value of current, iref(k-1) it is (k-1) moment given value of current, vout(k) it is that current k moment voltage is adjusted
Device exports, vout(k-1) it is that current (k-1) moment voltage regulator exports；
If the i at current timedetaLess than the i of last momentdeta, then low pass filter cutoff frequency is improved；
Wherein low-pass filter uses the given value of current at following formula calculating current adjuster current time, iref(k)=α0vout
(k)+α1iref(k-1)+...+αniref(k-n)αn, α0α1…αnFor filter coefficient, iref(k-n) it is that (k-n) moment electric current is given
It is fixed.
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| CN111490534B (en) * | 2020-04-05 | 2021-12-14 | 清华大学 | Method and system for controlling constant proportion of port voltage of interface converter between direct current buses |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204145011U (en) * | 2014-09-28 | 2015-02-04 | 枣庄力源电力设计有限公司 | A kind of storage battery photovoltaic charge-discharge control circuit |
| CN105790429A (en) * | 2016-04-28 | 2016-07-20 | 上海电机学院 | Low-power uninterrupted power source based on bidirectional DC-DC converter and control method thereof |
| CN205489769U (en) * | 2016-03-31 | 2016-08-17 | 华北电力大学 | Power generation and energy storage system with wind and light mutually complemented |
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| CN102570804B (en) * | 2010-12-28 | 2015-02-25 | 台达电子工业股份有限公司 | DC (direct current) power supply conversion module and control method thereof as well as connector and energy collection system |
| CN104253471B (en) * | 2013-06-28 | 2017-02-22 | 比亚迪股份有限公司 | Charging system and charging control method of electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204145011U (en) * | 2014-09-28 | 2015-02-04 | 枣庄力源电力设计有限公司 | A kind of storage battery photovoltaic charge-discharge control circuit |
| CN205489769U (en) * | 2016-03-31 | 2016-08-17 | 华北电力大学 | Power generation and energy storage system with wind and light mutually complemented |
| CN105790429A (en) * | 2016-04-28 | 2016-07-20 | 上海电机学院 | Low-power uninterrupted power source based on bidirectional DC-DC converter and control method thereof |
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Effective date of registration: 20210205 Address after: 523000 No. 1 science and technology nine road, high tech Industrial Development Zone, Songshan Lake, Dongguan, Guangdong Patentee after: GUANGDONG HUST INDUSTRIAL TECHNOLOGY Research Institute Address before: 523000 No. 1 science and technology nine road, high tech Industrial Development Zone, Songshan Lake, Dongguan, Guangdong Patentee before: GUANGDONG HUST INDUSTRIAL TECHNOLOGY Research Institute Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY Patentee before: GUANGDONG INTELLIGENT ROBOTICS INSTITUTE |