CN103414335B - The distributed pressure equalizing control method of a kind of modular i SOS combined system - Google Patents
The distributed pressure equalizing control method of a kind of modular i SOS combined system Download PDFInfo
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- CN103414335B CN103414335B CN201310215494.0A CN201310215494A CN103414335B CN 103414335 B CN103414335 B CN 103414335B CN 201310215494 A CN201310215494 A CN 201310215494A CN 103414335 B CN103414335 B CN 103414335B
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Abstract
The invention discloses the distributed pressure equalizing control method of a kind of modular i SOS combined system, separately calculated by the module input variable to each converter module, reference signal and system output variable, to judge whether this converter module departs from steady operation point.When certain converter module departs from steady operation point, adjust its input power, force this converter module to get back to steady operation point, realize Pressure and Control.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 identical with control circuit 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, there is very high system redundancy, reliability and extensibility.
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 power conversion field.
Background technology
Along with developing rapidly of power electronic technology, multiple standardized transformation device module, towards high frequency, modularization and integrated future development, is formed by connection in series-parallel compound mode the study hotspot that the various power electronic equipments meeting different demand are Power electronics system integration technology by power electronic equipment.
Multiple transformer block coupled in series combining structure can be divided into two classes, i.e. input series and output parallel (Input-Series Output-Parallel, ISOP) combined system and input series connection export series connection (Input-Series Output-Series, ISOS) combined system, wherein ISOP combined system is applicable to high voltage input, low-voltage and high-current exports application scenario, and ISOS combined system is applicable to input, occasion that output voltage is all higher.In order to ensure that multiple transformer block coupled in series combined system normally works, all pressure/current-sharings of modules in system must be guaranteed.
At present, all pressures/flow equalize technology research for ISOP combined system gets the attention, all pressure/current share scheme of ISOP combined converter have two classes: one is by the change to converter topology structure and connected mode, do not need special grading ring joint can realize all pressure/current-sharings naturally of each module on controlling; Two is by adding Pressure and Control ring to realize.
But it is then relatively less for the research of module input each in ISOS combined system, output technology of pressure equalization.For ISOS combined system, professor Ayyanar that State of Arizona, US founds university proposes a kind of three close-loop control strategy be made up of output-voltage loop, output current inner ring and input grading ring, wherein output-voltage loop control system output voltage stabilization, input grading ring is all pressed by regulating the Setting signal of each blocks current inner ring to realize input, realizes exporting simultaneously and all presses.Each module input voltage self-balancing mechanism is to ensure system worked well to have scholar also to propose to utilize in ISOS combined system, although control simple, very high to each module parameter coherence request, and input voltage equilibrium degree affects larger by load current.In addition, for the ISOS combined system by two full-bridge converter module compositions, scholar is had to propose a kind of input Pressure and Control strategy exchanging 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 the redundancy of system, reliability and extensibility 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, carries out distributed Pressure and Control to ISOS system, each converter module is controlled separately separately, improves 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) the module input variable of each converter module, reference signal and system output variable are separately calculated, to judge whether this converter module departs from steady operation point;
2) if module input variable diminishes, then 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, then regulate the duty ratio of this converter module pwm signal, the module input voltage of this converter module is increased.
As a further improvement on the present invention, described 1st) in step, according to input sample coefficient, sampling is carried out to module input voltage and obtain input sample signal, this input sample signal is added with reference signal and obtains module reference voltage, then carry out sampling to system output voltage according to output downsampling factor to obtain exporting sampled signal, then this output sampled signal and module reference voltage are compared.
As another improvement of the present invention, described 1st) in step, according to input sample coefficient, sampling is carried out to module input voltage and obtain input sample signal, carry out sampling to system output voltage according to output downsampling factor to obtain exporting sampled signal, ask difference operation to obtain module to input sample signal with output sampled signal again and ask difference signal, this module asks difference signal to compare with reference signal again.
Improve as of the present invention the third, described 1st) in step, output voltage correction link is added to reduce system output voltage regulation to each module, namely according to input sample coefficient, sampling is carried out to module input voltage and obtain input sample signal, carry out sampling to system output voltage according to output downsampling factor to obtain exporting sampled signal, system is exported and carries out sampling again after sampled signal deducts reference signal and obtain output voltage correction signal, then input sample signal is added with reference signal and compares with output voltage correction signal, obtain module reference voltage, finally again this output sampled signal and module reference voltage are compared.
As the 4th kind of improvement of the present invention, described 1st) in step, according to input sample coefficient, sampling is carried out to module input voltage and obtain input sample signal, carry out sampling to system output voltage according to output downsampling factor to obtain exporting sampled signal, carry out sampling after output sampled signal is deducted reference signal again and obtain system output voltage correction signal, ask difference operation to obtain module to input sample signal with output sampled signal and ask difference signal, this module compares with reference signal after asking difference signal to superpose with correction signal 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 identical with control circuit 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, there is very high system redundancy, reliability and extensibility.
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 oscillogram;
When Fig. 4 is load jump, the module output voltage of each converter module of ISOS system, system output current oscillogram;
When Fig. 5 is input voltage mutation, the module input voltage of each converter module of ISOS system, system output voltage oscillogram;
When Fig. 6 is input voltage mutation, the module input voltage of single converter module, the output voltage waveform of three modules in ISOS system;
Fig. 7 is that single converter module accesses with when excising, the module input voltage of each converter module of ISOS system, system output voltage oscillogram;
Fig. 8 is that single converter module accesses with when excising, module input voltage, each converter module output voltage waveform of single converter module in 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, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to various equivalents of the present invention has all fallen within the application's claims limited range.
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 ISOS system.
Embodiment 1: 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 includes N number of converter module, has a control module 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 to realize Pressure and Control, and control module also comprises the electric capacity being connected in parallel on converter module input.
Below control method of the present invention is explained in detail.Suppose the disturbance due to the external world, 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 Vo is constant.First first converter module samples according to input sample coefficient k to the module input voltage vin 1 of this module, obtains the first input sample signal.To system output voltage Vo according to output downsampling factor k
vocarry out sampling and obtain exporting sampled signal Vof.This input sample signal is added with given reference signal Vref and obtains the first module reference voltage Vref1.Again the first module reference voltage Vref1 and output sampled signal Vof is asked poor.
Here to first be described the relation of each amount under limit.Have when stable state
k
voVo=Vref+kVin1 (1)
Vin1=Vin/N (2)
Wherein Vin is whole ISOS system is input voltage, k
vovo is and exports sampled signal Vof, kVin1 is the first input sample signal.
Therefore, when the module input voltage vin 1 of the first converter module reduces, foregoing to the first module reference voltage Vref1 with export sampled signal Vof and ask poor result necessarily to export sampled signal Vof to be greater than the first module reference voltage Vref1.As shown in Figure 2, steady operation point is O point, and the module input voltage vin 1 of the first converter module reduces, and makes its working point be displaced to 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 the duty ratio of regulation output to the PWM ripple of converter to reduce input power, namely Iin1 reduces, Icd1 increases, the voltage at the first electric capacity Cd1 two ends is increased, and 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 be only foregoing to the second module reference voltage Vref2 and export sampled signal Vof ask poor result, become export sampled signal Vof be less than the second module reference 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 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, namely Iin2 increases, Icd2 reduces, the voltage at the second electric capacity Cd2 two ends is increased, and 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.
Below to include the ISOS system of three converter modules, wherein system input voltage is 300V ~ 450V, and initialization system output voltage is 150V, and maximum output current is 5A.Fig. 3 and Fig. 4 sets forth three converter modules module input voltage separately, output current wave and three modules output voltage separately, output current wave when system load electric current suddenlys change between 2.5A and 5A.As can be seen from Fig. 3 and Fig. 4, when stable state and load changing, the input that this ISOS system can realize each module well is all pressed, thus realization output is all pressed.Fig. 5 and Fig. 6 sets forth the input voltage of three converter modules input voltage separately, the total output voltage waveforms of combined converter and a module when system input voltage suddenlys change between 310V and 450V, three modules output voltage waveforms separately.As can be seen from Fig. 5 and Fig. 6, when ISOS system input voltage raises, single inverter module output voltage and the total output voltage of system raise all to some extent, meet its output voltage and upwarp Adjustment Performance, and when stable state and input voltage mutation, the input that ISOS combined converter can realize each module preferably is all pressed and is exported and all presses.In addition, in order to verify that the control strategy of the bright proposition of this law can make ISOS combined system have very high redundancy, the present embodiment accesses suddenly for a module and excision situation is tested.When Fig. 7 and Fig. 8 sets forth a module access and excision, the input voltage of the output voltage waveforms that three modules input voltage separately, ISOS system are total and a module, three modules output voltage waveforms separately.Can find out, when a module access in ISOS system with when excising, entirety still can realize input and output well and all press.As can be seen here, the method that the present invention proposes has very high reliability.
Embodiment 2: as shown in Figure 9, still supposes the disturbance due to the external world in the present embodiment, 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 Vo is constant.First first input sample signal asks poor with output sampled signal Vof, and acquired results is that the first module asks difference signal Vof1.This first module asks difference signal Vof1 to ask poor with reference signal Vref 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, namely Iin1 reduces, and Icd1 increases, and the voltage at the first electric capacity Cd1 two ends is increased, 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, namely Iin2 increases, Icd2 reduces, the voltage at the second electric capacity Cd2 two ends is increased, 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 one.
Embodiment 3: the present embodiment adds output voltage correction link on the basis of embodiment 1, i.e. dotted box portion in each converter module in Figure 10.First first converter module samples according to 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 Vo according to output downsampling factor k
vocarry out sampling and obtain exporting sampled signal Vof.Then carry out sampling according to downsampling factor Kvc again after output sampled signal Vof being deducted reference signal Vref and obtain the first output voltage correction signal Vc1.First input sample signal is added with reference signal Vref afterwards, then compares with the first output voltage correction signal Vc1, obtains the first module reference voltage Vref1, is finally compared by output sampled signal Vof and the first module reference voltage Vref1 and asks poor.Ask poor result to produce a conditioning signal according to this, 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 one.
Below the principle of the present embodiment reduction system output voltage regulation is described:
Before introducing 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 had
ofor
System output voltage can be obtained upwarp coefficient and be
After introducing output voltage correction link, can have when stable state
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
Now system output voltage can be obtained upwarp coefficient and be
As can be seen from formula (4) and (7), the introducing of system output voltage correction link, substantially reduces output voltage and upwarps coefficient, thus improves system output voltage Adjustment Performance.
Claims (1)
1. the distributed pressure equalizing control method of modular i SOS combined system, is characterized in that, comprise the following steps:
1) to the module input variable of each converter module, reference signal and system output variable separately calculate, to judge whether this converter module departs from steady operation point, output voltage correction link is added to reduce system output voltage regulation to each module, namely according to input sample coefficient, sampling is carried out to module input voltage and obtain input sample signal, carry out sampling to system output voltage according to output downsampling factor to obtain exporting sampled signal, system is exported and carries out sampling again after sampled signal deducts reference signal and obtain output voltage correction signal, then input sample signal is added with reference signal and deducts output voltage correction signal again, obtain module reference voltage, finally again this output sampled signal and module reference voltage are compared,
2) if module input variable diminishes, then 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, then regulate the duty ratio of this converter module pwm signal, this module input variable is diminished.
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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 |
| 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 |
| 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 |
| CN107294391B (en) * | 2017-08-09 | 2020-02-14 | 广州金升阳科技有限公司 | Power conversion module and power supply system composed of same |
| 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 |
| CN109004844B (en) * | 2018-09-10 | 2020-05-26 | 哈尔滨工业大学 | Light storage coordination and output voltage-sharing comprehensive control method of series impedance source converter |
| CN109256954B (en) * | 2018-10-26 | 2021-07-30 | 国网江苏省电力有限公司 | Series-connection type power electronic transformer distributed controller without 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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| CN102035416A (en) * | 2010-12-14 | 2011-04-27 | 北京理工大学 | Method for controlling power equipartition of input-series output-series high-frequency link inverters |
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| CN102035416A (en) * | 2010-12-14 | 2011-04-27 | 北京理工大学 | Method for controlling power equipartition of input-series output-series high-frequency link inverters |
Non-Patent Citations (1)
| Title |
|---|
| Input-series and output-series connected modular dc-dc converters with active input voltage and output voltage sharing;R. Giri, R等;《Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition》;20041231;第1751-1754页 * |
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