CN102263496A - Power equalizing control method for multi-module DC-DC (Direct Current-Direct Current) convertor - Google Patents

Power equalizing control method for multi-module DC-DC (Direct Current-Direct Current) convertor Download PDF

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CN102263496A
CN102263496A CN201110204089XA CN201110204089A CN102263496A CN 102263496 A CN102263496 A CN 102263496A CN 201110204089X A CN201110204089X A CN 201110204089XA CN 201110204089 A CN201110204089 A CN 201110204089A CN 102263496 A CN102263496 A CN 102263496A
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沙德尚
邓凯
郭志强
廖晓钟
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Beijing Institute of Technology BIT
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Abstract

The invention relates to a power equalizing control method for a multi-module DC-DC (Direct Current-Direct Current) convertor, in particular relates to a power equalizing control method for an isolated DC-DC convertor used for inputting and outputting series, and belongs to the technical field of power electronics. An output-voltage output-current double-closed ring control is adopted for generating a PWM (Pulse-Width Modulation) signal of each module in a manner of redistributing a duty ratio, thereby equalizing the output voltages of all modules and realizing the power equalization of modules. The power equalizing control method for the multi-module DC-DC convertor has the advantages that the control method is simple, less sensors are used, the demand on the sensors is reduced, the production cost is lowered, a redundancy switching function is achieved, and the reliability and stability of the whole system are enhanced.

Description

A kind of power-sharing control method that is used for multimode DC-DC converter
Technical field
The present invention relates to a kind of power-sharing control method that is used for multimode DC-DC converter, particularly a kind of being used to imported the power-sharing control method that the isolated DC-DC converter of series connection is exported in series connection, belongs to electric and electronic technical field.
Background technology
For the DC power supply that is used in high pressure input occasion, the high-voltage problem that power device bore remains a challenge, be very limited because can bear high-tension power device like this, and cost is very high.Therefore, be very necessary by selecting correct topological structure to reduce the voltage that power device bears.By input series and output parallel or input series connection output series connection the isolated DC-DC converter module is combined, this combination goes for high pressure input occasion.Wherein input series connection output series connection DC-DC converter is specially adapted to the power supply occasion that all higher and input of input and output voltage and output need electromagnetic isolation, and this converter has following advantage:
(1) each converter module is divided equally and is born original input, output voltage, thereby can select the lower switching tube of voltage stress for use, and the conducting resistance of low tension switch pipe is less, thereby obtains higher operating efficiency;
(2) can replace the high and lower IGBT of switching frequency of voltage endurance capability with withstand voltage lower MOSFET, so the switching frequency of converter can promote, improve power density of transform;
(3) whole system is made up of standard module, has increased the redundancy and the reliability of system, adopts modular combination to reduce production cycle and cost simultaneously;
In order to guarantee the converter operate as normal, must guarantee that each module divides equally total input voltage and output voltage, otherwise each intermodule is with the emergent power inequality, the big module of power output can be because problem such as overheated reduces the reliability of system.Therefore, the power-sharing of realizing each module is to need the key issue that solves.
At the control of input series connection output series connection isolated DC-DC converter, IEEE Applied PowerElectronics Conference and Exposition delivered " Input-series and output-seriesconnected modular DC-DC converters with active input voltage and output voltagesharing " (the dynamic input and output voltage of input series connection output series connection DC-DC converter is divided equally) literary composition in 2004 and has proposed a kind of method that realizes power-sharing.For each module, this method is made of ring in output voltage ring, the output current and each module input grading ring, is three closed-loop control strategies.The introducing of input grading ring is by the instantaneous input voltage of each module of sampling, the input voltage of all modules is averaged as the set-point of each module input grading ring, with other set-point choosing methods compare can farthest reduce between each converter module with a module in the cross influence of different control loops, thereby this three closed loop control methods are all pressed by control input and are realized that output all presses, thereby guarantee that each modular power divides equally.Yet this method has the following disadvantages:
(1) system control method adopts three close-loop control modes, the control method complexity;
(2) owing to sampling input voltage, therefore sampling and outputting voltage needs a large amount of voltage sensors again, and cost increases greatly.
Summary of the invention
The present invention has proposed a kind of power-sharing control method that is used for multimode DC-DC converter in order to overcome the deficiency of existing control method.
The present invention is achieved by the following technical solutions.
A kind of power-sharing control method that is used for multimode DC-DC converter of the present invention, adopt the two closed-loop controls of output voltage and output current, the mode of redistributing by duty ratio produces the pwm signal of each module, the output voltage that reaches each module is divided equally, thereby realizes that each modular power divides equally.Because duty ratio is a shared ratio of switching tube on-state time in the switch periods, be numerically equal to the ratio of modulating wave amplitude and carrier amplitude, so described duty ratio to redistribute also be redistributing of modulating wave.
The main circuit of described multimode DC-DC converter is made of the form of n identical isolated DC-DC converter module by input series connection, output series connection, wherein n is the numeral more than 2 or 2, be serially connected with inductance on the output loop of each module, converter can be normal shock, anti-swash, full-bridge, half-bridge, recommend or the high-frequency isolation formula DC-DC converter of push-pull ortho-exciting structure.
Power-sharing control method of the present invention the steps include:
1) determines that the output voltage of each module is given, be specially the output voltage of setting each module and be given as the given v of main circuit output voltage Ref Also be
Figure BDA0000077085400000022
2) output voltage and the outputting inductance electric current of each module are sampled, sampled result is designated as: the output voltage of each module is respectively v O1..., v Oj..., v On, the value that the output voltage of each module obtains behind over-sampling is respectively v Of1..., v Ofj..., v Ofn, each module outputting inductance electric current is respectively i Lf1..., i Lfj..., i Lfn, the value that each module outputting inductance electric current obtains behind over-sampling is respectively i F1..., i Fj..., i Fn, also promptly wherein the output voltage of module j be v Oj, the value that obtains behind over-sampling is v Ofj, the outputting inductance electric current is i Lfj, the value that obtains behind over-sampling is i Fj, 1≤j≤n wherein;
3) determine the given of each blocks current ring, wherein the concrete grammar that determination module j electric current loop is given is: with the output voltage sampled result v of module j OfjGiven with the output voltage of module j
Figure BDA0000077085400000031
Compare, and through Voltage loop adjuster G VoThe i of output after the compensation RefjGiven as module j electric current loop;
4) determine the output valve of each blocks current ring, wherein the concrete grammar of the output valve of determination module j electric current loop is: with the outputting inductance current sample of module j i as a result FjWith the given i of module j electric current loop RefjCompare, and through electric current loop adjuster G IoThe value of exporting behind compensation and the process amplitude limit is i Outj
5) the output valve i of each blocks current ring that will obtain by step 4) Out1..., i Outj..., i OutnRedistribute, be output as after wherein module j redistributes
Figure BDA0000077085400000032
1≤j≤n wherein;
Output after the output valve of each the blocks current ring that 6) step 5) is obtained is redistributed compares as modulating wave and carrier wave, is controlled the break-make of switching tube in each module by the pwm control signal that relatively produces.
When arbitrary module k lost efficacy in the above-mentioned main circuit that contains n DC-DC converter, this module is removed from system, promptly whole system is carried out work by n-1 module, and the output voltage of the n-1 of an operate as normal module is given by original
Figure BDA0000077085400000033
Become
Figure BDA0000077085400000034
The control method that adopts duty ratio to redistribute is output as after promptly redistributing for the output valve of arbitrary module j electric current loop of operate as normal
Figure BDA0000077085400000035
It is compared as modulating wave and carrier wave, by the break-make of the pwm control signal control module j switching tube that relatively produces.
When new when dropping into a module adding job in the above-mentioned main circuit that contains n DC-DC converter, whole system is carried out work by n+1 module, wherein the output voltage of arbitrary module j given by Become
Figure BDA0000077085400000042
The control method that adopts duty ratio to redistribute is output as after promptly redistributing for the output valve of arbitrary module j electric current loop of operate as normal
Figure BDA0000077085400000043
It is compared as modulating wave and carrier wave, by the break-make of the pwm control signal control module j switching tube that relatively produces.
The control method that whole system adopts this duty ratio to redistribute, reach the purpose that input and output voltage is divided equally, thereby realize that each modular power divides equally,, guaranteed that high frequency electric source can safety and stability work effectively even system still can normally move under the situation of operational blocks which partition system switching.
Beneficial effect
The present invention adopts the control mode of voltage, current double closed-loop with respect to prior art, and control method is simple; Only need output voltage, the output current of each module are sampled, reduced the quantity of used transducer, also reduce the transducer requirement simultaneously, reduced production cost; Function with redundant switching can improve the reliability and stability of whole system.
Description of drawings
The multimode DC-DC inverter main circuit connection diagram of Fig. 1 embodiment of the invention;
Among Fig. 1, n is the converter module number that main circuit comprised; v InRepresent total input direct voltage; S 1, S 2S nBe each module and input dividing potential drop electric capacity switch in parallel; C D1, C D2C DnBe input dividing potential drop electric capacity; v Cd1, v Cd2V CdnBe each module input voltage; i In1, i In2I InnBe each module input current; v oBe the output total voltage; i oBe the output total current; v O1, v O2V OnBe each module output voltage; S ' 1, S ' 2S ' nBe each module switch in parallel with the output filter capacitor; i Lf1, i Lf2I LfnBe each module filtered inductive current; L F1, L F2L FnOutput inductor for each module; C F1, C F2C FnOutput filter capacitor for each module;
The schematic diagram of the power-sharing control method that is adopted in Fig. 2 embodiment of the invention;
Duty ratio in the multimode DC-DC inverter main circuit of Fig. 3 embodiment of the invention under arbitrary module k failure conditions is redistributed control method;
Among Fig. 2 and Fig. 3, v RefFor the main circuit output voltage given; v Of1, v Of2V OfnBe each module output voltage sampling; H V1, H V2H VnBe each module output voltage feedback factor; G VoVoltage loop adjuster for each module;
Figure BDA0000077085400000051
Be carrier signal; Be output violent change; i Ref1, i Ref2I RefnBe each module voltage ring adjuster output; i F1, i F2I FnBe each module filtered inductive current sampling; H I1, H I2H InBe each module filtered inductor current feedback coefficient; G IoElectric current loop adjuster for each module; i Out1, i Out2I OutnBe each output of blocks current controller behind amplitude limit; I ' Out1, i ' Out2I ' OutnBe the new modulating wave amplitude that produces after redistributing through duty ratio; PWM 1, PWM 2PWM nBe each module switch management and control system signal.
Embodiment
A kind of power-sharing control method that is used for multimode DC-DC converter, wherein the main circuit of multimode DC-DC converter is made of the form of n isolated DC-DC converter module by input series connection, output series connection, as shown in Figure 1, high-frequency isolation formula converter DC-DC part, filter inductance, electric capacity and load, wherein input direct voltage is v In, converter can be normal shock, anti-swash, full-bridge, half-bridge, recommend or the high-frequency isolation formula DC-DC converter of push-pull ortho-exciting structure.
For the isolated DC-DC converter of input series connection output series connection, for the purpose of the power-sharing of realizing each module, the control mode that adopts duty ratio to redistribute.In Fig. 2, the output voltage of whole converter system is given as v Ref, the given voltage of the Voltage loop of each module is
Figure BDA0000077085400000053
The output voltage of each module is v O1, v O2..., v On, the filter inductance electric current is i Lf1, i Lf2I LfnFor module 1, output voltage v O1Obtain v by the voltage sensor sampling Of1Be Voltage Feedback, given with Voltage loop
Figure BDA0000077085400000054
Relatively, through Voltage loop adjuster G VoOutput i Ref1Given as module 1 electric current loop, the feedback i of the electric current loop of module 1 F1With the given i of electric current loop Ref1Compare electric current loop adjuster G IoThe value of output obtains i through amplitude limit Out1For arbitrary module j, output voltage v OjObtain v by the voltage sensor sampling OfjBe Voltage Feedback, given with Voltage loop
Figure BDA0000077085400000055
Relatively, through Voltage loop adjuster G Vo, output i RefjGiven as module j electric current loop, the feedback i of the electric current loop of module j FjWith the given i of electric current loop RefjCompare electric current loop adjuster G IoThe value of output obtains i through amplitude limit OutjThe current regulator output of each module is redistributed through the value behind the amplitude limit,, other all current regulators except module 1 are exported through the value addition behind amplitude limits,, produce new modulating wave i ' again divided by (n-1) for module 1 Out1, promptly
Figure BDA0000077085400000061
Modulating wave and carrier wave are compared back generation PWM 1The switching tube break-make of control module 1; For operational blocks which partition system j, the value addition after will other all the current regulator output violent changes except module j again divided by (n-1), produces new modulating wave amplitude i ' Outj, promptly Modulating wave and carrier wave are compared back generation PWM jThe switching tube break-make of control module j.
The system that considers under the situation that operational blocks which partition system in the n module lost efficacy still can operate as normal, design following redundancy control method: suppose module k inefficacy, be added in input end capacitor C DkThe switch S at two ends kWith output filter capacitor C FkThe switch S at two ends ' kClosure, k excises from system with module, and a remaining n-1 module is carried out the input and output Pressure and Control.Each module output voltage of operate as normal given by
Figure BDA0000077085400000063
Become
Figure BDA0000077085400000064
The output voltage v of arbitrary module j OjObtain v by the voltage sensor sampling OfjBe Voltage Feedback, given with this module voltage
Figure BDA0000077085400000065
Compare voltage regulator G VoOutput i RefjGiven as module j electric current loop, current feedback i FjWith the given i of electric current loop RefjCompare, the value of current regulator output obtains i through behind the amplitude limit OutjOther n-2 effective modules produce i by same method Out1, i Out2I Out (k-1), i Out (k+1)I Outn, the value of this n-1 current regulator output violent change is redistributed.For module 1, other all current regulators except module 1 are exported through the value addition behind amplitude limits, again divided by (n-2), produce new modulating wave i ' Out1, promptly
Figure BDA0000077085400000066
With modulating wave i ' Out1Compare the back with carrier wave and produce PWM 1The switching tube break-make of control module 1.For arbitrary module j, other all current regulators except module j are exported through the value addition behind amplitude limits, again divided by (n-2), produce new modulating wave i ' Outj, promptly
Figure BDA0000077085400000067
With modulating wave i ' OutjCompare the back with carrier wave and produce PWM jThe switching tube break-make of control module j.
When newly dropping into a module adding job in the main circuit of multimode DC-DC converter, promptly whole system is made up of n+1 module again.The output voltage of arbitrary module j given by
Figure BDA0000077085400000071
Become
Figure BDA0000077085400000072
Still the new modulating wave that the control method that adopts duty ratio to redistribute, each module carry out producing after duty ratio is redistributed is
Figure BDA0000077085400000073
With modulating wave i ' OutjCompare the control signal PWM of generation with carrier wave jThe break-make of control module j switching tube.
Whole system is redistributed link by duty ratio and is reached the purpose that input, output voltage are divided equally respectively, realizes that each modular power divides equally, even system still can normally move under the situation of operational blocks which partition system switching.Distribute the introducing of link by duty ratio, improved system's inhibition ability to voltage disturbance in the dynamic response process, thereby realized the quick adjustment of system.The present invention applies to the isolated DC-DC converter, this converter can be normal shock, anti-swash, full-bridge, half-bridge, recommend, all high-frequency isolation formula DC-DC converters such as push-pull ortho-exciting.
More than a kind of power-sharing control method that is used for multimode DC-DC converter provided by the present invention is described in detail, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.

Claims (7)

1. power-sharing control method that is used for multimode DC-DC converter, wherein the main circuit of multimode DC-DC converter is made of the form of n identical isolated DC-DC converter module by input series connection, output series connection, wherein n is the numeral more than 2 or 2, be serially connected with inductance on the output loop of each module, a described n converter module is identical normal shock, instead swash, full-bridge, half-bridge, recommend or the high-frequency isolation formula DC-DC converter of push-pull ortho-exciting structure, it is characterized in that the step of method is:
1) determines that the output voltage of each module is given;
2) output voltage and the outputting inductance electric current of each module are sampled, and the record sampled result, the output voltage of each module is designated as v respectively O1..., v Oj..., v On, the output voltage sampling of each module is designated as v respectively Of1..., v Ofj..., v Ofn, each module outputting inductance electric current is designated as i respectively Lf1..., i Lfj..., i Lfn, each module outputting inductance current sample is designated as i respectively F1..., i Fj..., i Fn, also promptly wherein the output voltage of module j be v Oj, output voltage is sampled as v Ofj, the outputting inductance electric current is i Lfj, the outputting inductance current sample is i Fj, the scope of j is 1≤j≤n;
3) determine the given of each blocks current ring;
4) determine the output valve of each blocks current ring;
5) the output valve i of each blocks current ring that will obtain by step 4) Out1..., i Outj..., i OutnRedistribute;
Output after the output valve of each the blocks current ring that 6) step 5) is obtained is redistributed compares as modulating wave and carrier wave, is controlled the break-make of switching tube in each module by the pwm control signal that relatively produces.
2. a kind of power-sharing control method that is used for multimode DC-DC converter according to claim 1, it is characterized in that determine in the described step 1) that the given method of output voltage of each module is specially: the output voltage of setting each module is given as the given v of main circuit output voltage Ref
Figure FDA0000077085390000011
Also be
Figure FDA0000077085390000021
3. a kind of power-sharing control method that is used for multimode DC-DC converter according to claim 1 is characterized in that the given concrete grammar of determination module j electric current loop is in the described step 3): with the output voltage sampled result v of module j OfjGiven with the output voltage of module j
Figure FDA0000077085390000022
Compare, and through Voltage loop adjuster G VoThe i of output after the compensation RefjGiven as module j electric current loop;
The scope of above-mentioned j is 1≤j≤n.
4. a kind of power-sharing control method that is used for multimode DC-DC converter according to claim 1 is characterized in that, the concrete grammar of the output valve of described step 4) determination module j electric current loop is: with the outputting inductance current sample of module j i as a result FjWith the given i of module j electric current loop RefjCompare, and through electric current loop adjuster G IoThe value of exporting behind compensation and the process amplitude limit is i Outj
The scope of above-mentioned j is 1≤j≤n.
5. a kind of power-sharing control method that is used for multimode DC-DC converter according to claim 1 is characterized in that the computational methods that described step 5) is redistributed the output valve of module j electric current loop are:
Figure FDA0000077085390000023
I ' wherein OutjBe the output of module j after redistributing;
The scope of above-mentioned j is 1≤j≤n.
6. according to claim 1,2 or 5 described a kind of power-sharing control methods that are used for multimode DC-DC converter, it is characterized in that: when arbitrary module k in the main circuit of described multimode DC-DC converter lost efficacy and removed the back from system, whole system is carried out work by n-1 module, and wherein the output voltage of arbitrary module j is given as And after redistributing, the output valve of module j electric current loop is output as i ′ outj = 1 n - 2 ( Σ i = 1 k - 1 i outi + Σ i = k + 1 n i outi - i outj ) .
7. according to claim 1,2 or 5 described a kind of power-sharing control methods that are used for multimode DC-DC converter, it is characterized in that: when new when dropping into a module adding job identical in the main circuit of described multimode DC-DC converter with former DC-DC converter module, whole system is carried out work by n+1 module, and wherein the output voltage of arbitrary module j is given as
Figure FDA0000077085390000031
And after redistributing, the output valve of module j electric current loop is output as i ′ outj = 1 n + 1 ( Σ i = 1 n + 1 i outi - i outj ) .
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CN102723870A (en) * 2012-06-21 2012-10-10 中国矿业大学(北京) Input-series and output-series full-bridge high-frequency isolated bidirectional direct current / direct current (DC/DC) converter
CN102723870B (en) * 2012-06-21 2015-07-08 中国矿业大学(北京) Input-series and output-series full-bridge high-frequency isolated bidirectional direct current / direct current (DC/DC) converter
CN104753353A (en) * 2013-12-31 2015-07-01 国家电网公司 Two-way transmission converter applicable to high voltage and high power
CN104716859A (en) * 2015-04-14 2015-06-17 国家电网公司 Equalization control method for power of plurality of parallel inverters in island microgrid
CN104767380A (en) * 2015-04-15 2015-07-08 扬州大学 Automobile direct current-direct current converter circuit and control method thereof
CN105207468A (en) * 2015-09-11 2015-12-30 哈尔滨工业大学深圳研究生院 Voltage difference control method of DC/DC converter
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