CN103414335A - Distributed voltage-sharing control method for modular ISOS combined system - Google Patents
Distributed voltage-sharing control method for modular ISOS combined system Download PDFInfo
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Abstract
The invention discloses a distributed voltage-sharing control method for a modular ISOS combined system. The distributed voltage-sharing control method comprises the steps of: calculating a module input quantity, a reference signal and a system output quantity of each convertor module respectively and independently, so as to judge whether the convertor module deviates from a steady state operating point; and regulating the input power of one convertor module when an operating point of the convertor module deviates from the steady state operating point, so as to force the operating point of the convertor module to return to the steady state operating point, thereby realizing the voltage-sharing control. According to the distributed voltage-sharing control method for the modular ISOS combined system provided by the invention, the control circuits are distributed into the converter modules, so that the power circuits and control circuits of the converter modules are identical and can work independently, in addition, the voltage-sharing control of the converter modules is not related to that of the others in any way, thereby truly realizing the modular design of combined system, and being high in system redundancy, reliability and expandability.
Description
Technical field
The present invention relates to the distributed pressure equalizing control method of a kind of modular i SOS combined system, belong to the power conversion field.
Background technology
Along with developing rapidly of power electronic technology, power electronic equipment is towards high frequency, modularization and integrated future development, and it is study hotspots of power electronic system integrated technology that a plurality of standardized transformation device modules are formed to the various power electronic equipments that meet different demands by the connection in series-parallel compound mode.
Multiple transformer module tandem compound structure can be divided into two classes, be input series and output parallel (Input-Series Output-Parallel, ISOP) combined system and input series connection output string connection (Input-Series Output-Series, ISOS) combined system, wherein the ISOP combined system is applicable to high voltage input, low-voltage and high-current output application scenario, and the ISOS combined system is applicable to input, output voltage higher occasion all.In order to guarantee the normal operation of multiple transformer module tandem compound system, must guarantee all pressure/current-sharings of modules in system.
At present, for all pressures of ISOP combined system/flow equalize technology research, obtained extensive concern, all pressures of ISOP combined converter/current-sharing scheme has two classes: the one, and by the change to converter topology structure and connected mode, on controlling, do not need special grading ring joint can realize all pressure/current-sharings naturally of each module; The 2nd, by adding the Pressure and Control ring, realize.
Yet the research for each module input, output technology of pressure equalization in the ISOS combined system is relatively less.For the ISOS combined system, professor Ayyanar of the vertical university of State of Arizona, US has proposed a kind of three ring control strategies that are comprised of ring in output-voltage loop, output current and input grading ring, output-voltage loop control system output voltage stabilization wherein, the input grading ring is realized all pressures of input by regulating in each blocks current the given signal encircled, and realizes simultaneously exporting all pressing.Have the scholar also to propose to utilize in the ISOS combined system each module input voltage self-balancing mechanism to carry out the normal operation of assurance system, although control simple, very high to each module parameter coherence request, and the input voltage equilibrium degree affected by load current larger.In addition, for the ISOS combined system by two full-bridge converter module compositions, there is the scholar to propose a kind of input Pressure and Control strategy that exchanges duty ratio.The common feature of above-mentioned Pressure and Control strategy is each module common control circuit, lacks independence between each module, and the ISOS combined system degree of modularity is not high, and redundancy, reliability and the extensibility of system are affected.
Summary of the invention
Goal of the invention: the present invention proposes the distributed pressure equalizing control method of a kind of modular i SOS combined system, and the ISOS system is carried out to distributed Pressure and Control, and each converter module is controlled separately separately, has improved the reliability of system.
Technical scheme: the technical solution used in the present invention is the distributed pressure equalizing control method of a kind of modular i SOS combined system, comprises the following steps:
1) module input variable, reference signal and the system output variable of each converter module are calculated separately respectively, whether depart from the steady operation point to judge this converter module;
2) if the module input variable diminishes, regulate the duty ratio of this converter module pwm signal, the module input current of this converter module is reduced;
3) if module input quantitative change is large, the duty ratio of regulating this converter module pwm signal, increase the module input voltage of this converter module.
As a further improvement on the present invention, the described the 1st) in step, the module input voltage is sampled and obtained the input sample signal according to the input sample coefficient, this input sample signal obtains module references voltage with the reference signal addition again, then the system output voltage is sampled and obtained exporting sampled signal according to output sampling coefficient, then should export sampled signal and module references voltage compares.
As another improvement of the present invention, the described the 1st) in step, the module input voltage is sampled and obtained the input sample signal according to the input sample coefficient, the system output voltage is sampled and obtained exporting sampled signal according to output sampling coefficient, to the input sample signal, ask difference operation to obtain module with the output sampled signal again and ask difference signal, this module asks difference signal with reference signal, to compare again.
As the third improvement of the present invention, the described the 1st) in step, add the output voltage correction link to reduce system output voltage regulation to each module, namely the module input voltage is sampled and obtained the input sample signal according to the input sample coefficient, the system output voltage is sampled and obtained exporting sampled signal according to output sampling coefficient, system is exported to sampled signal to be deducted after reference signal to sample again and obtains the output voltage correction signal, then input sample signal and reference signal addition are compared with the output voltage correction signal again, obtain module references voltage, finally sampled signal should be exported again and module references voltage compares.
As the 4th kind of improvement of the present invention, the described the 1st) in step, the module input voltage is sampled and obtained the input sample signal according to the input sample coefficient, the system output voltage is sampled and obtained exporting sampled signal according to output sampling coefficient, to export sampled signal deducts after reference signal to sample again and obtains system output voltage correction signal, to the input sample signal, ask difference operation to obtain module with the output sampled signal and ask difference signal, this module compares with reference signal after asking difference signal and correction signal stack again.
Beneficial effect: the distributed pressure equalizing control method of a kind of modular i SOS combined system that the present invention proposes, control circuit is distributed in modules, make the power circuit of each converter module and control circuit identical and can work independently, in addition, the Pressure and Control of each converter module are without any contact, really realize the modularized design of combined system, have very high system redundancy, reliability and extensibility.
The accompanying drawing explanation
Fig. 1 is the control method schematic diagram of the embodiment of the present invention 1;
Fig. 2 is the input-output characteristic curve figure of each converter module in this ISOS combined system;
When Fig. 3 is load changing, the module input voltage of each converter module of ISOS system, system output current wave figure;
When Fig. 4 is the load saltus step, the module output voltage of each converter module of ISOS system, system output current wave figure;
When Fig. 5 is input voltage mutation, the module input voltage of each converter module of ISOS system, system output voltage waveform;
When Fig. 6 is input voltage mutation, the output voltage waveform of the module input voltage of single converter module, three modules in the ISOS system;
When Fig. 7 is single converter module access and excision, the module input voltage of each converter module of ISOS system, system output voltage waveform;
When Fig. 8 is single converter module access and excision, the module input voltage of single converter module, each converter module output voltage waveform in the ISOS system;
Fig. 9 is the control method schematic diagram of the embodiment of the present invention 2;
Figure 10 is the control method schematic diagram of the embodiment of the present invention 3.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is not used in and limits the scope of the invention be used to the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of various equivalents of the present invention.
In claims, specification and Figure of description, except special instruction, suffix i=1,2,3 ... N, wherein N is the number of converter module in the ISOS system.
Embodiment 1: and the input and output of the ISOS system of multiple transformer all press/and sharing control is very important, and each converter module has identical linear input-output characteristic, and is the linear relationship be directly proportional, i.e. so-called bending upwards.As shown in Figure 1, an ISOS system has comprised N converter module, and a control module is arranged in each converter module.Control module is sampled to module input voltage and system output voltage in real time, and does corresponding calculating and control and realize Pressure and Control, and control module also comprises the electric capacity that is connected in parallel on the converter module input.
Below control method of the present invention is explained in detail.Suppose due to extraneous disturbance, the module input voltage vin 1 of the first converter module reduces, and the module input voltage vin 2 of the second converter module increases simultaneously, and system output voltage V o is constant.At first the first converter module samples according to the input sample coefficient k to the module input voltage vin 1 of this module, obtains the first input sample signal.To system output voltage V o according to output sampling coefficient k
VoSample and obtain exporting sampled signal Vof.This input sample signal and given reference signal Vref addition obtain the first module references voltage Vref1.Again the first module references voltage Vref1 and output sampled signal Vof are asked to poor.
Here will be first the relation of each amount under limit be described.When stable state, have
k
voVo=Vref+kVin1 (1)
Vin1=Vin/N (2)
Wherein Vin is that whole ISOS system is input voltage, k
VoVo is output sampled signal Vof, and kVin1 is the first input sample signal.
Therefore, when the module input voltage vin 1 of the first converter module reduced, foregoing the first module references voltage Vref1 and output sampled signal Vof are asked to poor result must be that output sampled signal Vof is greater than the first module references voltage Vref1.As shown in Figure 2, steady operation point is the O point, and the module input voltage vin 1 of the first converter module reduces, and makes its working point be displaced to the A point left.So ask poor result to produce a conditioning signal according to this, this conditioning signal is after the conversion of output voltage adjustment function Gvo, be used for regulation output to the duty ratio of the PWM ripple of converter to reduce input power, be that Iin1 reduces, Icd1 increases, make the voltage at the first capacitor C d1 two ends increase, namely the module input voltage vin 1 of the first converter module raises, and forces the first converter module to come back to steady operation point O.
In like manner the second converter module is only foregoing the second module references voltage Vref2 and output sampled signal Vof to be asked to poor result, becomes output sampled signal Vof and is less than the second module references voltage Vref2.In Fig. 2, the module input voltage vin 2 of the second converter module increases, and makes its working point be displaced to the B point to the right.So ask poor result to produce a conditioning signal according to this, this conditioning signal is through the conversion of output voltage adjustment function Gvo, regulation output to the duty ratio of the PWM ripple of this converter module to increase input power, be that Iin2 increases, Icd2 reduces, make the voltage at the second capacitor C d2 two ends increase, namely the module input voltage vin 2 of the second converter module reduces, and forces the second converter module to come back to steady operation point O.
The ISOS system that includes three converter modules of below take is example, and wherein the system input voltage is 300V～450V, and the initialization system output voltage is 150V, and maximum output current is 5A.Fig. 3 and Fig. 4 are for having provided respectively three converter modules module input voltage, output current wave and three modules output voltage, output current wave separately separately when the system load electric current suddenlys change between 2.5A and 5A.From Fig. 3 and Fig. 4, finding out, when stable state and load changing, this ISOS system can realize well that the input of each module all presses, thereby realizes that output all presses.Fig. 5 and Fig. 6 have provided respectively when the system input voltage suddenlys change between 310V and 450V three converter modules total output voltage waveforms of input voltage, combined converter and input voltage of a module, three modules output voltage waveforms separately separately.By Fig. 5 and Fig. 6, can be found out, when ISOS system input voltage raises, the total output voltage of single inverter module output voltage and system all raises to some extent, meet its output voltage and upwarp the adjustment characteristic, and when stable state and input voltage mutation, the ISOS combined converter can realize preferably that the input of each module all presses and export all and to press.In addition, have very highly redundant for the control strategy of verifying the bright proposition of this law can make the ISOS combined system, the present embodiment is tested for the access suddenly of a module and excision situation.When Fig. 7 and Fig. 8 have provided respectively a module access and excision, the output voltage waveforms that three modules input voltage, ISOS system separately is total and the input voltage of a module, three modules output voltage waveforms separately.Can find out, when module access in the ISOS system and excision, integral body can realize well that still input and output all press.As can be seen here, the method for the present invention's proposition has very high reliability.
Embodiment 2: as shown in Figure 9, in the present embodiment, still suppose due to extraneous disturbance, the module input voltage vin 1 of the first converter module reduces, and the module input voltage vin 2 of the second converter module increases simultaneously, and system output voltage V o is constant.At first the first input sample signal asks poor with output sampled signal Vof, and acquired results is that the first module is asked difference signal Vof1.This first module asks difference signal Vof1 with reference signal Vref, to ask poor again, and ask poor result to produce a conditioning signal according to this, this conditioning signal is through the conversion of output voltage adjustment function Gvo, regulation output to the duty ratio of the PWM ripple of converter to reduce input power, be that Iin1 reduces, Icd1 increases, and makes the voltage at the first capacitor C d1 two ends increase, namely the module input voltage vin 1 of the first converter module raises, and forces the first converter module to come back to steady operation point O.
In like manner the second converter module regulation output to the duty ratio of the PWM ripple of this converter module to increase input power, be that Iin2 increases, Icd2 reduces, make the voltage at the second capacitor C d2 two ends increase, namely the module input voltage vin 2 of the second converter module reduces, and forces the second converter module to come back to steady operation point O.Other parts of the present embodiment are identical with embodiment mono-.
Embodiment 3: the present embodiment has increased the output voltage correction link on the basis of embodiment 1, i.e. the interior dotted line frame part of each converter module in Figure 10.At first the first converter module samples according to the input sample coefficient k to the module input voltage vin 1 of the first converter module, obtains the first input sample signal.To system output voltage V o according to output sampling coefficient k
VoSample and obtain exporting sampled signal Vof.Then will export after sampled signal Vof deducts reference signal Vref and according to sampling COEFFICIENT K vc, sample and obtain the first output voltage correction signal Vc1 again.The first input sample signal and reference signal Vref addition afterwards, then with the first output voltage correction signal Vc1 relatively, obtain the first module references voltage Vref1, finally will export sampled signal Vof and the first module references voltage Vref1 and compare and ask poor.According to this, ask poor result to produce a conditioning signal, this conditioning signal, after the conversion of output voltage adjustment function Gvo, is used for the duty ratio of regulation output to the PWM ripple of converter.Other parts of the present embodiment are identical with embodiment mono-.
The principle that below the present embodiment is reduced to system output voltage regulation describes:
Before introducing the output voltage correction link:
k
voV
o＝V
ref+kV
inj (j=1,2,…,N) (1)
V
inj＝V
in/N (j=1,2,…,N) (2)
V can be arranged
oFor
Can obtain the system output voltage upwarps coefficient and is
After introducing the output voltage correction link, can when stable state, have
k
voV
o＝V
ref+kV
inj-k
vc(k
voV
o-V
ref) (j=1,2,…,N) (5)
Convolution (2), can have V
oFor
Can obtain now the system output voltage upwarps coefficient and is
By formula (4) and (7), can be found out, the introducing of system output voltage correction link, greatly reduced output voltage and upwarped coefficient, adjusts characteristic thereby improved the system output voltage.
Claims (4)
1. the distributed pressure equalizing control method of modular i SOS combined system, is characterized in that, comprises the following steps:
1) module input variable, reference signal and the system output variable of each converter module are calculated separately respectively, whether depart from the steady operation point to judge this converter module;
2) if the module input variable diminishes, regulate the duty ratio of this converter module pwm signal, make this module input quantitative change large;
3) if module input quantitative change is large, the duty ratio of regulating this converter module pwm signal, diminish this module input variable.
2. the distributed pressure equalizing control method of modular i SOS combined system according to claim 1, it is characterized in that, the described the 1st) in step, the module input voltage is sampled and obtained the input sample signal according to the input sample coefficient, this input sample signal obtains module references voltage with the reference signal addition again, then the system output voltage is sampled and obtained exporting sampled signal according to output sampling coefficient, then should export sampled signal and module references voltage compares.
3. the distributed pressure equalizing control method of modular i SOS combined system according to claim 1, it is characterized in that, the described the 1st) in step, the module input voltage is sampled and obtained the input sample signal according to the input sample coefficient, the system output voltage is sampled and obtained exporting sampled signal according to output sampling coefficient, to the input sample signal, ask difference operation to obtain module with the output sampled signal again and ask difference signal, this module asks difference signal with reference signal, to compare again.
4. the distributed pressure equalizing control method of modular i SOS combined system according to claim 1, it is characterized in that, the described the 1st) in step, add the output voltage correction link to reduce system output voltage regulation to each module, namely the module input voltage is sampled and obtained the input sample signal according to the input sample coefficient, the system output voltage is sampled and obtained exporting sampled signal according to output sampling coefficient, system is exported to sampled signal to be deducted after reference signal to sample again and obtains the output voltage correction signal, then input sample signal and reference signal addition deduct the output voltage correction signal again, obtain module references voltage, finally sampled signal should be exported again and module references voltage compares.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104993694A (en) * | 2015-07-09 | 2015-10-21 | 哈尔滨工业大学 | Input voltage sharing control method of modularized combined direct-current converter |
| 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 |
| CN106452068A (en) * | 2016-10-14 | 2017-02-22 | 哈尔滨工业大学深圳研究生院 | DC/DC converter input-series output-series voltage equalizing control method |
| CN109004844A (en) * | 2018-09-10 | 2018-12-14 | 哈尔滨工业大学 | The light storage of series impedance source converter is coordinated to press integrated control method with output |
| CN109067176A (en) * | 2018-08-02 | 2018-12-21 | 哈尔滨工程大学 | A kind of DC/DC converter maximum induction electric current current-sharing control method |
| CN109256954A (en) * | 2018-10-26 | 2019-01-22 | 国网江苏省电力有限公司南通供电分公司 | A kind of tandem type electric power electric transformer distributed director of no real time communication |
| WO2019029303A1 (en) * | 2017-08-09 | 2019-02-14 | 广州金升阳科技有限公司 | Power conversion module and power supply system |
| CN114079393A (en) * | 2020-08-14 | 2022-02-22 | 台达电子企业管理（上海）有限公司 | Conversion system and control method |
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| CN104993694A (en) * | 2015-07-09 | 2015-10-21 | 哈尔滨工业大学 | Input voltage sharing control method of modularized combined direct-current converter |
| 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 |
| CN105207468B (en) * | 2015-09-11 | 2018-07-31 | 哈尔滨工业大学深圳研究生院 | A kind of voltage difference control method of DC/DC converters |
| CN106452068A (en) * | 2016-10-14 | 2017-02-22 | 哈尔滨工业大学深圳研究生院 | DC/DC converter input-series output-series voltage equalizing control method |
| CN106452068B (en) * | 2016-10-14 | 2019-09-27 | 哈尔滨工业大学深圳研究生院 | A kind of concatenated pressure equalizing control method of DC/DC converter input series connection output |
| WO2019029303A1 (en) * | 2017-08-09 | 2019-02-14 | 广州金升阳科技有限公司 | Power conversion module and power supply system |
| CN109067176A (en) * | 2018-08-02 | 2018-12-21 | 哈尔滨工程大学 | A kind of DC/DC converter maximum induction electric current current-sharing control method |
| CN109067176B (en) * | 2018-08-02 | 2020-04-07 | 哈尔滨工程大学 | Current sharing control method for maximum inductive current of DC/DC converter |
| CN109004844A (en) * | 2018-09-10 | 2018-12-14 | 哈尔滨工业大学 | The light storage of series impedance source converter is coordinated to press integrated control method with output |
| CN109256954A (en) * | 2018-10-26 | 2019-01-22 | 国网江苏省电力有限公司南通供电分公司 | A kind of tandem type electric power electric transformer distributed director of no real time communication |
| CN114079393A (en) * | 2020-08-14 | 2022-02-22 | 台达电子企业管理（上海）有限公司 | Conversion system and control method |
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