CN105811774A - DC/DC converter output control method - Google Patents
DC/DC converter output control method Download PDFInfo
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- CN105811774A CN105811774A CN201610057776.6A CN201610057776A CN105811774A CN 105811774 A CN105811774 A CN 105811774A CN 201610057776 A CN201610057776 A CN 201610057776A CN 105811774 A CN105811774 A CN 105811774A
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- power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention discloses a DC/DC converter output control method. A total control unit obtains output total power of a DC/DC converter, according to the output total power, power needed by each power module is calculated, and a control unit of each module, according to the received module power, adjusts output voltages and adjusts output currents through adjusting the output voltages at the same time; and the module control units calculates output power of each module in real time in an adjustment process. According to the invention, random combination of multiple modules can be realized, a flow equalization state can be reached after random parallel connection, and the reliability of flow equalization is guaranteed.
Description
Technical field
The present invention relates to a kind of DC/DC changer output control method.
Background technology
Within 2014, first row hydrogen fuel tramcar rolls off the production line.Fuel cell has energy transformation ratio height, fuel variation, the advantages such as environmental pollution is little, noise is low, highly reliable, maintainability is good.Owing to the electric output characteristic of fuel battery engines is softer and considers the needs that Full Vehicle System controls, high power D C/DC changer is one of its requisite key components and parts；How to design hydrogen fuel DC-DC, be not only related to the properly functioning of fuel cell pile and Full Vehicle System, and be related to the reliable and stable operation of the power performance of whole fuel cell tramcar, efficiency of energy utilization and other control system.
The high power D C/DC used at present mainly adopts single large power supply to power and the output power supply of multiple small-power wired in parallel, and single large power supply is powered and mainly had the disadvantage that:
1. during power failure, whole system cisco unity malfunction；
2. small-power work limitation rate is low；
3. cannot be carried out modularized design, when for different outputs, it is necessary to redesign.
The scheme of multiple wired in parallel output has multiple, but the modules external characteristics of parallel connection is difficult to unanimously.The factors such as the restriction due to the inevitable property of error and technological level, real system participates in the modules of parallel connection, their parameter each other all can some difference, this difference is only possible to and reduces as far as possible, but can not avoid completely, it addition, the parameter of modules (as: output voltage, electric current) also can change with the change of the environmental factors such as temperature over time, the difference of the intermodule parameter that this environmental factors causes is likely to bigger than module difference inherently many.Then, if module is directly in parallel, owing to modules external characteristics is inconsistent, the module that voltage regulation factor is little, external characteristics is good, undertake electric current more, even transship；And the module of some external characteristics difference runs on underloading, zero load even substantially.Its result certainly will be the module that share current is too much, and thermal stress becomes big, and the probability of damage rises, reliability decrease.
Summary of the invention
The technical problem to be solved is, not enough for prior art, it is provided that a kind of DC/DC changer output control method.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of DC/DC changer output control method, comprises the following steps:
1) master control unit obtains the output general power of DC/DC changer, if the rated power of output general power/N≤30%* power model that master control unit obtains, then master control list reduces the number of the power model participating in work, until the rated power of the output general power/N > 30%* power model of master control unit acquisition, enter step 2)；Otherwise, it is directly entered step 2)；N is the number of power model；
2) calculate the given power of DC/DC each power model of changer according to described output general power, the given power participating in each power model of work is sent to the control unit of each power model by master control unit；Wherein, the number that given power=output general power/M, M is the power model participating in work of each power model of work is participated in；
3) control unit the turning on and off according to the given each power model switching tube of power adjustments of each power model of work is participated in, thus regulate output voltage and the output electric current of each power model, until the output voltage of each power model × output electric current=given power.
Step 2) the process that implements include: the control unit of each power model participating in work judges whether the output voltage of each power model reaches the voltage given, if not up to, then the control unit of each power model regulates the output voltage of each self-corresponding power model, until each power model output voltage=given voltage, judge that whether output voltage × output the electric current of now each power model is equal to given power simultaneously, if not, then master control unit increases given voltage, give electric current and be sent to the control unit of each power model, the control unit of each power model regulates the output voltage of each power model according to given voltage and the given electric current of master control unit and exports electric current, whether each power model output voltage × output electric current after the adjustment of master control unit judges is equal to given power；If equal, then power model always works under this given power rating；If each power model output voltage × module output current is less than given power, then repeat above-mentioned adjustment process；If each power model output voltage × output electric current is more than given power, then after power model output electric current reaches given output electric current, output electric current is further added by, and master control unit controls output voltage and begins to decline so that each power model output voltage × output electric current is equal to given power.
Compared with prior art, the had the beneficial effect that present invention of the present invention can realize multimode combination in any, can reach equal stream mode, it is ensured that the reliability of current-sharing after random parallel connection.Can also only allow one or several module work in low power situation simultaneously, improve the work efficiency of changer.
Accompanying drawing explanation
Fig. 1 is modular circuit schematic diagram；
Fig. 2 is DC/DC transformer configuration block diagram.
Detailed description of the invention
Master control unit obtains total power, calculates the power required for modules according to total energy meter, becomes current/voltage value to be sent to modules the power conversion of modules.The control unit of modules carries out Current limited Control according to the current value of master control unit.Inside modules adopts double; two Closed control.Outer shroud adopts Voltage loop to control, and internal ring adopts current loop control.First Voltage loop works, and after reaching the current value (total current/N (N: the number of parallel module) of acquisition) that master control unit is given, electric current loop works, it is ensured that power limitation control.If after the current value reaching to give of each module, electric current is further added by, voltage begins to glide, and output electric current is not reaching to given cut-off current and obtains module because of output voltage height, and current value increases automatically.The power being automatically adjusted to modules is consistent.If master control unit obtains the output general power less (gross output of acquisition/N≤30%* power model rated power) of DC/DC changer, master control list reduces the number of the power model participating in work, reduce the power attenuation under no-load condition, improve total delivery efficiency.After one of them module breaks down, the work of other modules is unaffected, can also control the mutual switch operating of modules in small-power situation, increases the reliability of system.
Embodiment
If hydrogen fuel cell internal parallel, because the output voltage of 2 hydrogen fuel cells is it cannot be guaranteed that consistent, 2 hydrogen fuel cells output current-unbalances can be caused, it is possible to cause that a module crosses stream.Hydrogen fuel cell has a strong impact on service life after crossing stream.According to the data that hydrogen fuel cell producer provides, hydrogen fuel is service life: 12000hrs, if frequent mistake flows use, service life is: 2000hrs.
Hydrogen fuel DC-DC overall design demanded power output 200kW, adopts 4 wired in parallel, each module design rated power 50kW.Existing power device IGBT, commutation diode causes the switching frequency of module not high, and isolating transformer volume is big, Heavy Weight.Adopt multiple module can improve the switching frequency of module, reduce total volume and weight.Switching frequency can reach 15-20kHz.The output general power of hydrogen fuel DC-DC can according to the requirement real-time change of traction and aid system.According to the method for the present invention, controlling wherein 2 modules and export at rated power, efficiency can reach 93% in total power process.
Claims (2)
1. a DC/DC changer output control method, it is characterised in that comprise the following steps:
1) master control unit obtains the output general power of DC/DC changer, if the rated power of output general power/N≤30%* power model that master control unit obtains, then master control list reduces the number of the power model participating in work, until the rated power of the output general power/N > 30%* power model of master control unit acquisition, enter step 2)；Otherwise, it is directly entered step 2)；N is the number of power model；
2) calculate the given power of DC/DC each power model of changer according to described output general power, the given power participating in each power model of work is sent to the control unit of each power model by master control unit；Wherein, the number that given power=output general power/M, M is the power model participating in work of each power model of work is participated in；
3) control unit the turning on and off according to the given each power model switching tube of power adjustments of each power model of work is participated in, thus regulate output voltage and the output electric current of each power model, until the output voltage of each power model × output electric current=given power.
null2. DC/DC changer output control method according to claim 1，It is characterized in that，The process that implements of described step 3) includes: the control unit of each power model participating in work judges whether the output voltage of each power model reaches the voltage given，If not up to，Then the control unit of each power model regulates the output voltage of each self-corresponding power model，Until each power model output voltage=given voltage，Judge that whether output voltage × output the electric current of now each power model is equal to given power simultaneously，If not，Then master control unit increases given voltage、Give electric current and be sent to the control unit of each power model，The control unit of each power model regulates the output voltage of each power model according to given voltage and the given electric current of master control unit and exports electric current，Whether each power model output voltage × output electric current after the adjustment of master control unit judges is equal to given power；If equal, then power model always works under this given power rating；If each power model output voltage × module output current is less than given power, then repeat above-mentioned adjustment process；If each power model output voltage × output electric current is more than given power, then after power model output electric current reaches given output electric current, when output electric current is further added by, master control unit controls output voltage and begins to decline so that each power model output voltage × output electric current is equal to given power.
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| CN201610057776.6A CN105811774B (en) | 2016-01-28 | 2016-01-28 | A kind of DC/DC converters output control method |
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| CN201610057776.6A CN105811774B (en) | 2016-01-28 | 2016-01-28 | A kind of DC/DC converters output control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110385995A (en) * | 2019-07-30 | 2019-10-29 | 深圳市英威腾电气股份有限公司 | A kind of control circuit and control method of Hydrogen Fuel-cell Vehicles dcdc converter |
| CN112448562A (en) * | 2019-08-30 | 2021-03-05 | 比亚迪股份有限公司 | DC-DC converter and control method thereof |
| CN112583251A (en) * | 2019-09-30 | 2021-03-30 | 比亚迪股份有限公司 | Train, bidirectional DC-DC converter and control method, device and system thereof |
| CN112751359A (en) * | 2020-12-31 | 2021-05-04 | 江苏延长桑莱特新能源有限公司 | Multi-module parallel operation power generation system of hydrogen fuel cell and control method thereof |
| CN112994212A (en) * | 2019-12-02 | 2021-06-18 | 科华恒盛股份有限公司 | Power regulation method of electrical equipment |
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| CN112583251A (en) * | 2019-09-30 | 2021-03-30 | 比亚迪股份有限公司 | Train, bidirectional DC-DC converter and control method, device and system thereof |
| CN112583251B (en) * | 2019-09-30 | 2023-08-08 | 比亚迪股份有限公司 | Train, bidirectional DC-DC converter, control method, device and system thereof |
| CN112994212A (en) * | 2019-12-02 | 2021-06-18 | 科华恒盛股份有限公司 | Power regulation method of electrical equipment |
| CN112751359A (en) * | 2020-12-31 | 2021-05-04 | 江苏延长桑莱特新能源有限公司 | Multi-module parallel operation power generation system of hydrogen fuel cell and control method thereof |
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| CN105811774B (en) | 2018-08-24 |
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