CN103346673A - Multichannel parallel-connection DC-DC convertor control system and method - Google Patents
Multichannel parallel-connection DC-DC convertor control system and method Download PDFInfo
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Abstract
The invention provides a multichannel parallel-connection DC-DC convertor control system and method. A current inner ring control module is independently arranged in each DC-DC convertor, the DC-DC convertors can respectively adjust the output duty ratio according to collected electric reactor current of corresponding DC-DC convertors, and accordingly current distribution between parallel-connection DC-DC convertors is achieved. Amplitude limiting is carried out on a voltage outer ring control module and the current inner ring control modules respectively, second amplitude limiting in each current inner ring control module is identical with a specific circuit structure, and current distribution between the parallel-connection DC-DC convertors can be guaranteed through the second amplitude limiting. By means of double closed loop control of voltage outer rings and current inner rings, the independent current inner rings are mainly used for respectively limiting different current demands to carry out independent closed loop control on the electric reactor current of each DC-DC convertor. The system can automatically distribute current between the parallel-connection DC-DC convertors according to design requirements.
Description
Technical field
The present invention relates to the convertor controls technical field, particularly a kind of DC-DC converter control system and method for multi-channel parallel.
Background technology
Along with the critical shortage of the energy, utilize new forms of energy to become a certainty, this clean energy resource of solar energy also has been subjected to increasing favor.
In solar power system, cell panel is electric energy with transform light energy, then by inverter be converted to can be for household use alternating current, then in order to realize that inverter can work under wide input voltage, generally can increase booster converter in the input of inverter.
Introduce booster converter (Boost circuit) in detail below in conjunction with accompanying drawing, referring to Fig. 1, this figure is typical Boost circuit diagram in the prior art.
Wherein L is the Boost reactor, and D is the Boost output diode, and G is switching tube, can preferably can adopt metal-oxide-semiconductor for semiconductor switch devices such as metal-oxide-semiconductor or IGBT pipes.
The Boost circuit is a kind of switch DC booster circuit, and it can make the output voltage of circuit than input voltage height.
When input power is big, generally can increases the multichannel booster converter, thereby improve the conversion efficiency of booster converter.
Referring to Fig. 2, this figure is the DC-DC converter schematic diagram of the multi-channel parallel that provides in the prior art.
The input of the N among Fig. 2 Boost circuit is connected in parallel, and is respectively Boost1, Boost2, until BoostN, output also is connected in parallel.Input voltage is Vpv, and output voltage is Vout.
When the impedance matching of the Boost of parallel connection circuit, Boost can realize sharing control normally, need not special processing this moment.But because two-way or the unmatched problem of multichannel Boost circuit impedance can appear in the difference of device in the Boost circuit.To cause the input current of Boost circuit in parallel larger difference to occur like this, and not current-sharing namely occur, and may cause one road electric current bigger, overheat condition appears in hardware, influences the life-span of hardware.Particularly when some occasion required two-way to import not current-sharing, one road input current that requires that for example has was 10A, and the maximum input current in another road is 16A, and system is sharing control not.
In sum, no matter be the uneven flow problem that causes of hardware reason or artificially require not current-sharing that the DC-DC converter of multi-channel parallel must possess the ability of electric current being controlled according to designing requirement.
Summary of the invention
The technical problem to be solved in the present invention provides control system and the method for a kind of multichannel DC-DC converter parallel connection, can realize that the electric current between the multichannel DC-DC converter distributes.
The embodiment of the invention provides the control system of a kind of multichannel DC-DC converter parallel connection, comprising: voltage sample module, a N current sample module, outer voltage control module, a N current inner loop control module;
Described N current sample module and N current inner loop control module are corresponding one by one;
Described voltage sample module for the voltage of the DC-DC converter input of gathering N road parallel connection, sends to described outer voltage control module with the voltage signal of gathering; N is the integer more than or equal to 2;
Described outer voltage control module is used for described voltage signal and given magnitude of voltage are compared, with the voltage comparative result regulate with first amplitude limiting processing after current signal send to N current inner loop control module;
The DC-DC converter of described N current sample module and the parallel connection of N road is corresponding one by one;
Each described current sample module is used for gathering the electric current on the corresponding DC-DC converter reactor, and the described electric current of gathering is sent to corresponding current inner loop control module as current feedback signal;
Each described current inner loop control module, be used for according to the DC-DC converter of correspondence described current signal being carried out second amplitude limit, given current value and described current feedback signal after second amplitude limit output are compared, with the electric current comparative result regulate with the 3rd amplitude limit after output duty cycle; Described duty ratio is the duty ratio of the pulse signal of the conducting of switching tube in the corresponding DC-DC converter of control and disconnection.
Preferably, each current inner loop control module comprises: the second amplitude limit submodule;
The described second amplitude limit submodule is used for the described current signal that the outer voltage control module sends is carried out the amplitude limit of second amplitude;
Second amplitude in each current inner loop control module is respectively second amplitude 1 up to the second amplitude N; Described second amplitude, 1 to second amplitude N is identical or inequality.
Preferably, each current inner loop control module comprises: electric current comparison sub-module, first is regulated submodule, the 3rd amplitude limit submodule;
Described electric current comparison sub-module is used for given current value and the described current feedback signal of described second amplitude limit submodule output are compared; The electric current comparative result is sent to described first regulate submodule;
Described first regulates submodule, is used for described electric current comparative result is carried out P, PI or PID adjusting, and the result after regulating is sent to described the 3rd amplitude limit submodule;
Described the 3rd amplitude limit submodule is for output duty cycle behind the amplitude limit that the result after the described adjusting is carried out the 3rd amplitude;
Described the 3rd amplitude in each current inner loop control module is all identical.
Preferably, described outer voltage control module comprises: voltage comparison sub-module, second is regulated submodule and the first amplitude limit submodule;
Described voltage comparison sub-module is used for described voltage signal and given magnitude of voltage are compared, and the voltage comparative result is sent to described the 2nd PI regulate submodule;
Described second regulates submodule, is used for described voltage comparative result is carried out P, PI or PID adjusting, and the result who regulates is sent to the described first amplitude limit submodule;
The described first amplitude limit submodule is for sending to each current inner loop control module after the adjusting of the result after the described adjusting being carried out first amplitude;
Preferably, described first amplitude is the maximum among described second amplitude, 1 to the second amplitude N.
Preferably, described second amplitude allows the maximum average current value passed through for corresponding DC-DC converter.
Preferably, described DC-DC converter is the Boost converter or is the Buck converter.
The embodiment of the invention also provides a kind of control method based on above control system, comprising:
Gather the voltage of the DC-DC converter input of N road parallel connection;
Described voltage and given magnitude of voltage are compared, with comparative result regulate with first amplitude limiting processing after current signal send to N current inner loop control module;
Each current inner loop control module compares given current value and the current feedback signal that described current signal carries out behind second amplitude limit, with comparative result regulate with the 3rd amplitude limit after output duty cycle; Described current feedback signal is the electric current on the reactor in the corresponding DC-DC converter; Described duty ratio is the duty ratio of the pulse signal of the conducting of switching tube in the corresponding DC-DC converter of control and disconnection.
Preferably, second amplitude of the second amplitude limit correspondence in described N current inner loop control module is respectively second amplitude 1 up to the second amplitude N; Described second amplitude, 1 to second amplitude N is identical or inequality.
Preferably, first amplitude in described first amplitude limit is the maximum among described second amplitude, 1 to the second amplitude N.
Compared with prior art, the present invention has the following advantages:
Be provided with independent current inner loop control module for each DC-DC converter, each current inner loop control module is adjusted the duty ratio of output respectively according to the reactor current of the DC-DC converter of the correspondence of gathering like this, thereby realizes that the electric current between the DC-DC converter in parallel distributes.And all carried out amplitude limit in outer voltage control module and current inner loop control module.Because second amplitude limit in each current inner loop control module is consistent with particular circuit configurations, therefore can guarantee effectively that by second amplitude limit electric current between the DC-DC converter in parallel distributes.Therefore, the control system that the embodiment of the invention provides, by outer voltage and the two closed-loop controls of current inner loop, it is given mainly to limit different electric currents respectively by current inner loop independently, and respectively the reactor current of each DC-DC converter is carried out independent closed-loop control, no matter be the not current-sharing that causes of hardware reason or artificially require not current-sharing that this system all can distribute electric current between each DC-DC converter in parallel automatically by designing requirement.
Description of drawings
Fig. 1 is typical Boost circuit diagram in the prior art;
Fig. 2 is the schematic diagram of the multichannel DC-DC converter parallel connection that provides in the prior art;
Fig. 3 is control system embodiment one schematic diagram of multichannel DC-DC converter provided by the invention parallel connection;
Fig. 4 is control system embodiment two schematic diagrames of multichannel DC-DC converter provided by the invention parallel connection;
Fig. 5 is the schematic diagram of N Buck circuit parallel connection in the prior art.
Embodiment
In order to make those skilled in the art can understand and implement technical scheme of the present invention better, at first introduce outer voltage control and current inner loop control in the inverter system below.
Referring to Fig. 3, this figure is control system embodiment one schematic diagram of multichannel DC-DC converter provided by the invention parallel connection.
The control system of the multichannel DC-DC converter parallel connection that the embodiment of the invention provides comprises: voltage sample module 200, a N current sample module 400, outer voltage control module 300, a N current inner loop control module 500;
Described N current sample module and N current inner loop control module are corresponding one by one;
Described voltage sample module 200 for the voltage of DC-DC converter 100 inputs of gathering N road parallel connection, sends to described outer voltage control module 300 with the voltage signal of gathering;
Described outer voltage control module 300, be used for described voltage signal and given magnitude of voltage are compared, the voltage comparative result carried out that PI regulates and first amplitude limiting processing after current signal send to N current inner loop control module 500, the effect of first amplitude limit value is in the outer voltage control module: for a back grade current inner loop provides total amplitude limit;
The DC-DC converter of described N current sample module and the parallel connection of N road is corresponding one by one;
Each described current sample module 200 is used for gathering the electric current on the corresponding DC-DC converter reactor, and the described electric current of gathering is sent to corresponding current inner loop control module 500 as current feedback signal;
Need to prove have N DC-DC converter in parallel just to N current sample module should be arranged, each current sample module is gathered the electric current on the reactor in each DC-DC converter.As shown in Figure 3, first DC-DC converter 100a, second DC-DC converter 100b are all in parallel up to N DC-DC converter 100n.
Each described current inner loop control module 500, be used for according to the DC-DC converter of correspondence described current signal being carried out second amplitude limit, given current value and described current feedback signal after second amplitude limit output are compared, with the electric current comparative result regulate with the 3rd amplitude limit after output duty cycle; Described duty ratio is the duty ratio of the pulse signal of the conducting of switching tube in the corresponding DC-DC converter of control and disconnection.
Because the span of duty ratio is 0-1, so duty ratio can not surpass 1, therefore, carried out the 3rd amplitude limit for the output signal of current inner loop control module 500.
Need to prove that the DC-DC converter output terminal connects inverter 600, it is that alternating current feeds back to electrical network Vgrid later on that inverter 600 is used for dc inverter.
Second amplitude limit need decide according to side circuit, but scheme provided by the invention does not specifically limit the circuit concrete structure.The power that distributes when the DC-DC converter of system hardware circuit requirement parallel connection distributes second amplitude in second amplitude limit of each DC-DC converter in parallel not simultaneously as required; Distribute homogeneous phase simultaneously when the DC-DC of System Hardware Requirement parallel connection inverter power, then divide equally second amplitude in second amplitude limit of each DC-DC converter in parallel as required.
The control system that the embodiment of the invention provides, be provided with independent current inner loop control module for each DC-DC converter, each current inner loop control module is adjusted the duty ratio of output respectively according to the reactor current of the DC-DC converter of the correspondence of gathering like this, thereby realizes that the electric current between the DC-DC converter in parallel distributes.And all carried out amplitude limit in outer voltage control module and current inner loop control module.Because second amplitude limit in each current inner loop control module is consistent with particular circuit configurations, therefore can guarantee effectively that by second amplitude limit electric current between the DC-DC converter in parallel distributes.Therefore, the control system that the embodiment of the invention provides, by outer voltage and the two closed-loop controls of current inner loop, it is given mainly to limit different electric currents respectively by current inner loop independently, and respectively the reactor current of each DC-DC converter is carried out independent closed-loop control, no matter be the not current-sharing that causes of hardware reason or artificially require not current-sharing that this system all can distribute the electric current between each DC-DC converter in parallel automatically.
Need to prove that the adjusting in the embodiment of the invention can specifically not limit among the present invention and regulate type for a kind of in regulating of P, PI or PID, is adjusted to example with PI in following examples and describes.
Be that example is introduced with the parallel connection of two-way DC-DC converter below.But specifically do not limit the number of branches of DC-DC converter parallel connection among the present invention, control system provided by the invention all is suitable for for the DC-DC converter of parallel connection.
Referring to Fig. 4, this figure is control system embodiment two schematic diagrames of multichannel DC-DC converter provided by the invention parallel connection.
In the present embodiment, the booster circuit part is that example is introduced with two Boost circuit.
As can be seen from Figure 4, Boost1 comprises L1, D1, G1; Boost2 comprises L2, D2 and G2.
Current sample module 400(need to prove at two Boost two current sample modules are arranged) gather that the electric current on the L1 is IL1_fed among the Boost1; Electric current among the current sample module 400 collection Boost2 on the L2 is IL2_fed;
Each current inner loop control module comprises: the second amplitude limit submodule 501, electric current comparison sub-module 502, a PI regulate submodule 503, the 3rd amplitude limit submodule 504;
The described second amplitude limit submodule 501 is used for the described current signal that the outer voltage control module sends is carried out the amplitude limit of second amplitude;
Second amplitude in each current inner loop control module is respectively second amplitude 1 up to the second amplitude N; Described second amplitude, 1 to second amplitude N is identical or inequality;
As shown in Figure 4, in the second amplitude limit submodule 501 of two Boost correspondences be second amplitude 1 and second amplitude 2.
Described electric current comparison sub-module 502 is used for given current value and the described current feedback signal (being the electric current on the Boost circuit reactor L) of 501 outputs of the described second amplitude limit submodule are compared; The electric current comparative result is sent to a described PI regulate submodule 503;
Need to prove that in the present embodiment, current feedback signal is to equate with electric current on the L, be understandable that current feedback signal can be not equate with electric current on the L yet, and gets final product with the electric current on the L proportional (for example being directly proportional).As long as current feedback signal can reflect the electric current on the L.
As shown in Figure 4, the given current value in first current inner loop control module behind second amplitude, 1 amplitude limit is IL1_ref, and electric current comparison sub-module 502 is compared IL1_ref with IL1_fed; Given current value in second current inner loop control module behind second amplitude, 2 amplitude limits is IL2_ref, and electric current comparison sub-module 502 is compared IL2_ref with IL2_fed.
A described PI regulates submodule 503, is used for that described electric current comparative result is carried out PI and regulates, and the result after regulating is sent to described the 3rd amplitude limit submodule 504;
Described the 3rd amplitude limit submodule 504 is for output duty cycle behind the amplitude limit that the result after the described adjusting is carried out the 3rd amplitude;
Described the 3rd amplitude in each current inner loop control module is all identical.
Continue to introduce the outer voltage control module below in conjunction with Fig. 4.
The outer voltage control module comprises: voltage comparison sub-module 301, the 2nd PI regulate submodule 302 and the first amplitude limit submodule 303;
Described voltage comparison sub-module 301 is used for described voltage signal Vpv and given magnitude of voltage Vpv_Ref are compared, and the voltage comparative result is sent to described the 2nd PI regulate submodule 302;
Described the 2nd PI regulates submodule 302, is used for that described voltage comparative result is carried out PI and regulates, and the result who regulates is sent to the described first amplitude limit submodule 303;
The described first amplitude limit submodule 303 is for sending to each current inner loop control module after the adjusting of the result after the described adjusting being carried out first amplitude;
Described first amplitude is the maximum among described second amplitude, 1 to the second amplitude N.
For example, two current inner loop control modules among Fig. 4, first amplitude 1 in first current inner loop control module is 10A, and second amplitude is 16A, and then first amplitude is got the above two maximum, namely gets 16A.
Need to prove that described voltage sample module 200 can be voltage sensor.
Described current sample module 400 is current sensor.
Be understandable that described voltage sample module and current sample module also can adopt other modes to obtain the sampling of voltage and current, are not limited to above way of example among the application.
The maximum average current value of described second amplitude for allowing on the corresponding DC-DC converter reactor to pass through.
Maximum average current value refers to that reactor in the DC-DC converter can allow the maximum average current that passes through, and the second amplitude 1-N can be allowed the maximum average current decision passed through by reactor.
Described the 3rd amplitude is the maximum duty cycle of described current inner loop control module output.
As shown in Figure 4, duty cycle signals flows to the control end of the power switch pipe in the Boost circuit, comes down to represent the duty ratio of the pulse signal correspondence of driving switch pipe.The duty ratio of the pulse signal of duty ratio 1 corresponding G1.The duty ratio of the pulse signal of duty ratio 2 corresponding G2.
Among the above embodiment, described DC-DC converter is that example is introduced with the Boost converter, be understandable that, more than the technical scheme that provides of all embodiment be equally applicable to the Buck converter, specifically can be referring to Fig. 5, this figure is the schematic diagram of N Buck circuit parallel connection in the prior art.Certainly this patent also can be applicable to other DC/DC converters; Because what the embodiment of the invention was described is grid-connected occasion, therefore when the embodiment of the invention was applied to other occasions, outer voltage can change Vout into by Vpv, and inverter 600 and electrical network Vgrid etc. can equivalence be load, do not repeat them here.
The control system of a kind of multichannel DC-DC converter parallel connection that provides based on above embodiment, the embodiment of the invention also provides a kind of control method based on this control system.
The control method of the control system that provides based on above embodiment that the embodiment of the invention provides comprises:
Gather the voltage of the DC-DC converter input of N road parallel connection;
Described voltage and given magnitude of voltage are compared, with comparative result regulate with first amplitude limiting processing after current signal send to N current inner loop control module;
Each current inner loop control module compares given current value and the current feedback signal that described current signal carries out behind second amplitude limit, with comparative result regulate with the 3rd amplitude limit after output duty cycle; Described current feedback signal is the electric current on the reactor in the corresponding DC-DC converter; Described duty ratio is the duty ratio of the pulse signal of the conducting of switching tube in the corresponding DC-DC converter of control and disconnection.
Second amplitude of the second amplitude limit correspondence in described N current inner loop control module is respectively second amplitude 1 up to the second amplitude N; Described second amplitude, 1 to second amplitude N is identical or inequality.
First amplitude in described first amplitude limit is the maximum among described second amplitude, 1 to the second amplitude N.The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet is not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
Claims (10)
1. the control system of multichannel DC-DC converter parallel connection is characterized in that, comprising: voltage sample module, a N current sample module, outer voltage control module, a N current inner loop control module;
Described N current sample module and N current inner loop control module are corresponding one by one;
Described voltage sample module for the voltage of the DC-DC converter input of gathering N road parallel connection, sends to described outer voltage control module with the voltage signal of gathering; N is the integer more than or equal to 2;
Described outer voltage control module is used for described voltage signal and given magnitude of voltage are compared, with the voltage comparative result regulate with first amplitude limiting processing after current signal send to N current inner loop control module;
The DC-DC converter of described N current sample module and the parallel connection of N road is corresponding one by one;
Each described current sample module is used for gathering the electric current on the corresponding DC-DC converter reactor, and the described electric current of gathering is sent to corresponding current inner loop control module as current feedback signal;
Each described current inner loop control module, be used for according to the DC-DC converter of correspondence described current signal being carried out second amplitude limit, given current value and described current feedback signal after second amplitude limit output are compared, with the electric current comparative result regulate with the 3rd amplitude limit after output duty cycle; Described duty ratio is the duty ratio of the pulse signal of the conducting of switching tube in the corresponding DC-DC converter of control and disconnection.
2. the control system of multichannel DC-DC converter according to claim 1 parallel connection is characterized in that, each current inner loop control module comprises: the second amplitude limit submodule;
The described second amplitude limit submodule is used for the described current signal that the outer voltage control module sends is carried out the amplitude limit of second amplitude;
Second amplitude in each current inner loop control module is respectively second amplitude 1 up to the second amplitude N; Described second amplitude, 1 to second amplitude N is identical or inequality.
3. the control system of multichannel DC-DC converter according to claim 2 parallel connection is characterized in that, each current inner loop control module comprises: electric current comparison sub-module, first is regulated submodule, the 3rd amplitude limit submodule;
Described electric current comparison sub-module is used for given current value and the described current feedback signal of described second amplitude limit submodule output are compared; The electric current comparative result is sent to described first regulate submodule;
Described first regulates submodule, is used for described electric current comparative result is carried out P, PI or PID adjusting, and the result after regulating is sent to described the 3rd amplitude limit submodule;
Described the 3rd amplitude limit submodule is for output duty cycle behind the amplitude limit that the result after the described adjusting is carried out the 3rd amplitude;
Described the 3rd amplitude in each current inner loop control module is all identical.
4. the control system of multichannel DC-DC converter according to claim 3 parallel connection is characterized in that, described outer voltage control module comprises: voltage comparison sub-module, second is regulated submodule and the first amplitude limit submodule;
Described voltage comparison sub-module is used for described voltage signal and given magnitude of voltage are compared, and the voltage comparative result is sent to described the 2nd PI regulate submodule;
Described second regulates submodule, is used for described voltage comparative result is carried out P, PI or PID adjusting, and the result who regulates is sent to the described first amplitude limit submodule;
The described first amplitude limit submodule is for sending to each current inner loop control module after the adjusting of the result after the described adjusting being carried out first amplitude.
5. the control system of multichannel DC-DC converter according to claim 4 parallel connection is characterized in that,
Described first amplitude is the maximum among described second amplitude, 1 to the second amplitude N.
6. the control system of multichannel DC-DC converter according to claim 2 parallel connection is characterized in that, described second amplitude allows the maximum average current value passed through for corresponding DC-DC converter.
7. according to the control system of each described multichannel DC-DC converter parallel connection of claim 1-6, it is characterized in that described DC-DC converter is the Boost converter or is the Buck converter.
8. the control method based on the described control system of claim 1 is characterized in that, comprising:
Gather the voltage of the DC-DC converter input of N road parallel connection;
Described voltage and given magnitude of voltage are compared, with comparative result regulate with first amplitude limiting processing after current signal send to N current inner loop control module;
Each current inner loop control module compares given current value and the current feedback signal that described current signal carries out behind second amplitude limit, with comparative result regulate with the 3rd amplitude limit after output duty cycle; Described current feedback signal is the electric current on the reactor in the corresponding DC-DC converter; Described duty ratio is the duty ratio of the pulse signal of the conducting of switching tube in the corresponding DC-DC converter of control and disconnection.
9. control method according to claim 8 is characterized in that, second amplitude of the second amplitude limit correspondence in described N current inner loop control module is respectively second amplitude 1 up to the second amplitude N; Described second amplitude, 1 to second amplitude N is identical or inequality.
10. control method according to claim 8 is characterized in that, first amplitude in described first amplitude limit is the maximum among described second amplitude, 1 to the second amplitude N.
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