CN105281561A - Method for processing merging and current sharing problem of high-power high-frequency power supply - Google Patents
Method for processing merging and current sharing problem of high-power high-frequency power supply Download PDFInfo
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- CN105281561A CN105281561A CN201410252035.4A CN201410252035A CN105281561A CN 105281561 A CN105281561 A CN 105281561A CN 201410252035 A CN201410252035 A CN 201410252035A CN 105281561 A CN105281561 A CN 105281561A
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Abstract
The invention discloses a method for processing a merging and current sharing problem of a high-power high-frequency power supply. The method comprises the following steps that multiple independent high-frequency power supplies are connected in parallel to form a high-power high-frequency power supply system with power of 200-9900kw; the system shares one common control circuit; the system is equipped with an emergency power supply; a common current sharing bus is connected among all the independent high-frequency power supplies, voltage U<b> of the common current sharing bus is the average value of the voltage signals U<i> of respective output current of all the independent high-frequency power supplies, and U<b> is compared with sampling voltage of each independent high-frequency power supply and then error voltage is outputted via a regulating amplifier so that output current of each independent high-frequency power supply can be regulated and current sharing and merging can be realized; and output current and output current feedback of each independent high-frequency power supply are detected, and output current of each independent high-frequency power supply is controlled with the maximum current acting as the standard current sharing control principle. Accurate load current sharing can be realized, and the smooth production process can be guaranteed when a part of equipment fails to work.
Description
Technical field
The present invention relates to high frequency electric source field, specifically a kind of method processing the equal flow problem of merging of high-power high-frequency power supply.
Background technology
Due to Large Copacity consuming system shop equipment, substation relay protection device, automation equipment, emergency lighting, communication power supply and the increasing of DC inversion load exchanging uninterruption power source (UPS), it is very urgent for setting up a capacity DC power system that is large, safe and reliable, uninterrupted power supply.If only adopt a Power supply, rectifier can process huge power, and the electric stress of generation is large, all can bring difficulty to the raising of the selection of power device, switching frequency and power factor.And once certain power failure in system, then easily cause whole system to be in collapse conditions.
If adopt multiple high-frequency switching power supply module, and by its parallel running, the reasonable power of each rectification module process in power-supply system in parallel, system just can provide powerful output, and the problem that above-mentioned separate unit power supply is run into is solved.
In this theoretical foundation, the parallel system of high-frequency switching power supply module produces and is applied to variously to be needed in the production industry of high-power high-frequency power supply, but accurate not enough in the electric current distribution of the parallel system of existing high-frequency switching power supply module between individual equipment, the current equalizing method between system need development and improvement further.
Summary of the invention
The object of the invention is the defect overcoming above-mentioned prior art, a kind of method processing the equal flow problem of merging of high-power high-frequency power supply is provided, multiple stage high-power high-frequency power sources in parallel can become hundreds of to arrive the high-frequency power of a few megawatt by the method, and can accomplish can accomplish accurately equal current distribution between multiple stage high-power high-frequency power supply, and the good reliability of whole parallel system.
Technical scheme of the present invention is achieved in that a kind of method processing the equal flow problem of merging of high frequency electric source in parallel, comprises the following steps and requires:
A. several independent high frequency electric source parallel connections are formed the high power high frequency power source system that a power is 200-9900kw;
B. described high power high frequency power source system shares a Common Control Circuit;
C. described high power high frequency power source system is equipped with emergency power supply, and when arbitrary described independent high frequency electric source damages or overcurrent protection quits work, the load circuit that described emergency power supply is used for powering to this corrupted independence high frequency electric source provides electric energy;
D. a public current equalizing bus bar is connected with between each the independent high frequency electric source in described high power high frequency power source system, the voltage of described public current equalizing bus bar
for several independent high frequency electric sources represent the voltage signal of respective output current
maximum, wherein
export an error voltage by resonance-amplifier more afterwards with the sampling voltage signal of each independent high frequency electric source, thus regulate the output current of each independent high frequency electric source, realize the identical output of electric current; Thus realize the N times of relation that bus current is independent current source;
E. detect output current and the output current signal feedback of each independent high frequency electric source, control the output current of each independent high frequency electric source by maximum current sharing control principle.
Particularly, the theoretical foundation realizing electric current mean allocation in described step D is: make described independent high frequency electric source output voltage be
, then it has output characteristic
=f (
), when independent high frequency electric source is unloaded, its output voltage is
, described high frequency electric source output resistance is R, and as curent change △ I, load voltage change △ U, has R=△ U/ △ I; R=△ U/ △ I also represent the output voltage regulation of independent high frequency electric source;
Make the load voltage values of described independent high frequency electric source be Vo, then the available following formula of the relation of Vo and load current Io is expressed:
(1)
Make two the first independent high frequency electric sources that capacity is identical, parameter is identical and the second independent high frequency electric source parallel connection, then its load voltage
with
be expressed as follows respectively:
(2)
（3）
In formula, R1, R2 are respectively the output resistance of the first high frequency electric source and the second high frequency electric source, if RL is load resistance, known: as R1 ≈ R2, described first high frequency electric source is substantially identical with the output characteristic of the second high frequency electric source.
The maximum current sharing control principle controlling the Current adjustment of the wherein arbitrary independent high frequency electric source in the independent high frequency electric source of several parallel connections is as follows:
The voltage amplifier of the wherein arbitrary independent high frequency electric source in the independent high frequency electric source of several parallel connections is made to be input as
and feedback voltage
,
it is reference voltage
with sharing control voltage
comprehensive, it with
after comparing and enlarging, produce
come control PWM and driver,
for the output signal of current amplifier, and the load current of module is proportional,
for busbar voltage;
When two independent high frequency electric sources are in parallel, by two independent high frequency electric sources called after module 1 and module 2 respectively, use
and
the current signal of representation module 1 and module 2 respectively, described module 1 and module 2 all receive bus b through the resistance R that resistance is identical, therefore, when the electric current flowing into bus is zero, can obtain following formula:
(4) or
(5)
I.e. busbar voltage
be
with
mean value, also represent the mean value of module l, module 2 output current;
with
difference represent equal stream error, by adjustment amplifier export one adjustment voltage
, when
time, the voltage on resistance R is zero,
, now oneself achieves current-sharing, when R there being voltage occur, and electric current maldistribution between specification module 1 and module 2,
, at this moment reference voltage will by following formula correction:
（6）
From (6) formula, adjustment amplifier changes
, realize current-sharing.
The method of its average current when several independent high frequency electric sources are in parallel.
Method by average current load-sharing electric current of the present invention can realize load current-sharing accurately, regulate by the output current being provided with stand-by power supply and adopt maximum current sharing control principle to control each independent high frequency electric source simultaneously, ensure that produce when equipment component breaks down carry out smoothly and complete.
Accompanying drawing explanation
Fig. 1 is a kind of circuit theory diagrams processing separate unit independence high frequency electric source in the method for the equal flow problem of merging of high frequency electric source in parallel of the present invention.
The output characteristics figure of Fig. 2 when to be that the present invention is a kind of process the work of separate unit independence high frequency electric source in the method for the equal flow problem of merging of high frequency electric source in parallel.
The circuit theory diagrams of Fig. 3 when to be that the present invention is a kind of process two platform independent high frequency electric source parallel operation in the method for the equal flow problem of merging of high frequency electric source in parallel.
The output characteristics figure of Fig. 4 when to be that the present invention is a kind of process two platform independent high frequency electric source parallel operation in the method for the equal flow problem of merging of high frequency electric source in parallel.
The circuit theory diagrams of Fig. 5 when to be that the present invention is a kind of process some platform independent high frequency electric source parallel operations in the method for the equal flow problem of merging of high frequency electric source in parallel.
Fig. 6 is a kind of maximum current sharing control schematic diagram processing the method average current of the equal flow problem of merging of high frequency electric source in parallel of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention case is illustrated:
Process a method for the equal flow problem of merging of high frequency electric source in parallel, comprise the following steps and require:
A. several independent high frequency electric source parallel connections are formed the high power high frequency power source system that a power is 200-9900kw;
B. described high power high frequency power source system shares a Common Control Circuit;
C. described high power high frequency power source system is equipped with emergency power supply, and when arbitrary described independent high frequency electric source damages or overcurrent protection quits work, the load circuit that described emergency power supply is used for powering to this corrupted independence high frequency electric source provides electric energy;
D. a public current equalizing bus bar is connected with between each the independent high frequency electric source in described high power high frequency power source system, the voltage of described public current equalizing bus bar
for several independent high frequency electric sources represent the voltage signal of respective output current
maximum, wherein
export an error voltage by resonance-amplifier more afterwards with the sampling voltage signal of each independent high frequency electric source, thus regulate the output current of each independent high frequency electric source, realize the identical output of electric current; Thus realize the N times of relation that bus current is independent current source;
E. detect output current and the output current signal feedback of each independent high frequency electric source, control the output current of each independent high frequency electric source by maximum current sharing control principle.
In order to improve the reliability of described high power high frequency power source system, whole system does not increase outside sharing control measure, reduces current-sharing factors for failure, and the current-sharing transient response characteristic that whole system should accompany outfit good.
When described high power high frequency power source system input voltage or load current change time, the stable of output voltage should be able to be kept, and make system have good load response characteristic, when load changing, not cause electric current seriously distribute inequality and shut down.That is when the load, the output voltage change of every platform equipment is identical.
Particularly, as Figure 1-Figure 5, the theoretical foundation realizing electric current mean allocation in described step D is: make described independent high frequency electric source output voltage be
, then it has output characteristic
=f (
), when independent high frequency electric source is unloaded, its output voltage is
, described high frequency electric source output resistance is R, and as curent change △ I, load voltage change △ U, has R=△ U/ △ I; R=△ U/ △ I also represent the output voltage regulation of independent high frequency electric source;
Make the load voltage values of described independent high frequency electric source be Vo, then the available following formula of the relation of Vo and load current Io is expressed:
(1)
Make two the first independent high frequency electric sources that capacity is identical, parameter is identical and the second independent high frequency electric source parallel connection, then its load voltage
with
be expressed as follows respectively:
(2)
（3）
R1 in formula, R2 is respectively the output resistance of the first high frequency electric source and the second high frequency electric source, if RL is load resistance, known: as R1 ≈ R2, described first high frequency electric source is substantially identical with the output characteristic of the second high frequency electric source, and this is the theoretical foundation of average current technology.
Particularly, as shown in Figure 6, the maximum current sharing control principle controlling the Current adjustment of the wherein arbitrary independent high frequency electric source in the independent high frequency electric source of several parallel connections is as follows:
The voltage amplifier of the wherein arbitrary independent high frequency electric source in the independent high frequency electric source of several parallel connections is made to be input as
and feedback voltage
,
it is reference voltage
with sharing control voltage
comprehensive, it with
after comparing and enlarging, produce
come control PWM and driver,
for the output signal of current amplifier, and the load current of module is proportional,
for busbar voltage;
When two independent high frequency electric sources are in parallel, by two independent high frequency electric sources called after module 1 and module 2 respectively, use
and
the current signal of representation module 1 and module 2 respectively, described module 1 and module 2 all receive bus b through the resistance R that resistance is identical, therefore, when the electric current flowing into bus is zero, can obtain following formula:
(4) or
(5)
I.e. busbar voltage
be
with
mean value, also represent the mean value of module l, module 2 output current;
with
difference represent equal stream error, by adjustment amplifier export one adjustment voltage
, when
time, the voltage on resistance R is zero,
, now oneself achieves current-sharing, when R there being voltage occur, and electric current maldistribution between specification module 1 and module 2,
, at this moment reference voltage will by following formula correction:
（6）
From (6) formula, adjustment amplifier changes
, can current-sharing be realized.
Method by average current load-sharing electric current of the present invention can realize load current-sharing accurately, regulate by the output current being provided with stand-by power supply and adopt maximum current sharing control principle to control each independent high frequency electric source simultaneously, ensure that produce when equipment component breaks down carry out smoothly and complete.
As described above, be only preferred embodiment of the present invention, when not limiting scope of the invention process with this, the simple equivalence namely generally done according to the present patent application the scope of the claims and invention description content changes and modifies, and all still remains within the scope of the patent.
Claims (4)
1. process a method for the equal flow problem of merging of high frequency electric source in parallel, it is characterized in that, comprise the following steps and require:
A. several independent high frequency electric source parallel connections are formed the high power high frequency power source system that a power is 200-9900kw;
B. described high power high frequency power source system shares a Common Control Circuit;
C. described high power high frequency power source system is equipped with emergency power supply, and when arbitrary described independent high frequency electric source damages or overcurrent protection quits work, the load circuit that described emergency power supply is used for powering to this corrupted independence high frequency electric source provides electric energy;
D. a public current equalizing bus bar is connected with between each the independent high frequency electric source in described high power high frequency power source system, the voltage of described public current equalizing bus bar
for several independent high frequency electric sources represent the voltage signal of respective output current
maximum, wherein
export an error voltage by resonance-amplifier more afterwards with the sampling voltage signal of each independent high frequency electric source, thus regulate the output current of each independent high frequency electric source, realize the identical output of electric current; Thus realize the N times of relation that bus current is independent current source.
2.e. detects output current and the output current signal feedback of each independent high frequency electric source, controls the output current of each independent high frequency electric source by maximum current sharing control principle.
3. a kind of method processing the equal flow problem of merging of high frequency electric source in parallel as claimed in claim 1, it is characterized in that, the theoretical foundation realizing electric current mean allocation in described step D is: make described independent high frequency electric source output voltage be
, then it has output characteristic
=f (
), when independent high frequency electric source is unloaded, its output voltage is
, described high frequency electric source output resistance is R, and as curent change △ I, load voltage change △ U, has R=△ U/ △ I; R=△ U/ △ I also represent the output voltage regulation of independent high frequency electric source;
Make the load voltage values of described independent high frequency electric source be Vo, then the available following formula of the relation of Vo and load current Io is expressed:
(1)
Make two the first independent high frequency electric sources that capacity is identical, parameter is identical and the second independent high frequency electric source parallel connection, then its load voltage
with
be expressed as follows respectively:
(2)
（3）
In formula, R1, R2 are respectively the output resistance of the first high frequency electric source and the second high frequency electric source, if RL is load resistance, known: as R1 ≈ R2, described first high frequency electric source is substantially identical with the output characteristic of the second high frequency electric source.
4. a kind of method processing the equal flow problem of merging of high frequency electric source in parallel as claimed in claim 1 or 2, it is characterized in that, the maximum current sharing control principle controlling the Current adjustment of the wherein arbitrary independent high frequency electric source in the independent high frequency electric source of several parallel connections is as follows:
The voltage amplifier of the wherein arbitrary independent high frequency electric source in the independent high frequency electric source of several parallel connections is made to be input as
and feedback voltage
,
it is reference voltage
with sharing control voltage
comprehensive, it with
after comparing and enlarging, produce
come control PWM and driver,
for the output signal of current amplifier, and the load current of module is proportional,
for busbar voltage;
When two independent high frequency electric sources are in parallel, by two independent high frequency electric sources called after module 1 and module 2 respectively, use
and
the current signal of representation module 1 and module 2 respectively, described module 1 and module 2 all receive bus b through the resistance R that resistance is identical, therefore, when the electric current flowing into bus is zero, can obtain following formula:
(4) or
(5)
I.e. busbar voltage
be
with
mean value, also represent the mean value of module l, module 2 output current;
with
difference represent equal stream error, by adjustment amplifier export one adjustment voltage
, when
time, the voltage on resistance R is zero,
, now oneself achieves current-sharing, when R there being voltage occur, and electric current maldistribution between specification module 1 and module 2,
, at this moment reference voltage will by following formula correction:
（6）
From (6) formula, adjustment amplifier changes
, can current-sharing be realized.
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|---|---|---|---|
| CN201410252035.4A CN105281561A (en) | 2014-06-10 | 2014-06-10 | Method for processing merging and current sharing problem of high-power high-frequency power supply |
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Cited By (6)
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| CN106019027A (en) * | 2016-07-25 | 2016-10-12 | 国网江苏省电力公司电力科学研究院 | Device and method for detecting parallel current sharing characteristic of photovoltaic-energy storage combined power generation inversion systems |
| CN106787725A (en) * | 2016-12-30 | 2017-05-31 | 成都芯源***有限公司 | Multiphase parallel power supply system, single-chip switch integrated circuit and current sharing method |
| CN107147290A (en) * | 2017-06-07 | 2017-09-08 | 联想(北京)有限公司 | Power module and power-supply system |
| CN107147289A (en) * | 2017-06-01 | 2017-09-08 | 矽力杰半导体技术(杭州)有限公司 | Control method, control circuit and multi-phase converter |
| CN109039026A (en) * | 2018-10-16 | 2018-12-18 | 广州金升阳科技有限公司 | A kind of power module and power sources in parallel system |
| CN113054758A (en) * | 2021-03-16 | 2021-06-29 | 中国人民解放军海军工程大学 | Multi-channel wireless power transmission system for realizing power self-balancing |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019027A (en) * | 2016-07-25 | 2016-10-12 | 国网江苏省电力公司电力科学研究院 | Device and method for detecting parallel current sharing characteristic of photovoltaic-energy storage combined power generation inversion systems |
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| CN107147289A (en) * | 2017-06-01 | 2017-09-08 | 矽力杰半导体技术(杭州)有限公司 | Control method, control circuit and multi-phase converter |
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| CN109039026A (en) * | 2018-10-16 | 2018-12-18 | 广州金升阳科技有限公司 | A kind of power module and power sources in parallel system |
| CN113054758A (en) * | 2021-03-16 | 2021-06-29 | 中国人民解放军海军工程大学 | Multi-channel wireless power transmission system for realizing power self-balancing |
| CN113054758B (en) * | 2021-03-16 | 2023-03-14 | 中国人民解放军海军工程大学 | Multi-channel wireless power transmission system for realizing power self-balancing |
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Application publication date: 20160127 |