CN106877674B - Mode of resonance DC/DC inverter power balance control method and control system - Google Patents
Mode of resonance DC/DC inverter power balance control method and control system Download PDFInfo
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- CN106877674B CN106877674B CN201710170804.XA CN201710170804A CN106877674B CN 106877674 B CN106877674 B CN 106877674B CN 201710170804 A CN201710170804 A CN 201710170804A CN 106877674 B CN106877674 B CN 106877674B
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Classifications
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to mode of resonance DC/DC inverter power balance control method and control systems, including two layers of control, are the total active power controller of converter and inverter power Balance route respectively, the total active power controller of converter is for obtaining the phase shifting angle of converter；In inverter power Balance route, closed-loop control is carried out to each converter unit, obtains the correction amount of the corresponding switching frequency of each convertor unit；Then the corresponding switching frequency of revised each convertor unit is calculated；Balance route is carried out to corresponding convertor unit according to each convertor unit revised switching frequency.Carry out the active power of equalizing transform unit transmission by adjusting switching frequency, it realizes converter series side dc-voltage balance and transimission power is balanced, ensure that the stable operation of DC/DC converter, and, without adding special hardware configuration, input cost is reduced.
Description
Technical field
The present invention relates to mode of resonance DC/DC inverter power balance control method and control systems, belong to DC/DC converter
Power balance control technical field.
Background technique
The mainstream topology of DC/DC converter is side series connection side parallel connection type, as shown in Figure 1, DC/DC converter includes n
A converter unit, these converter unit sides are arranged in series, and also referred to as cascade setting, the other side is arranged in parallel, then, it will convert
The side that unit is arranged in series is known as the series side of converter, and the side that converter unit is arranged in parallel is known as the parallel connection of converter
Side, if for by Fig. 1, high-pressure side is arranged in series, low-pressure side is arranged in parallel, then, high-pressure side is the series side of converter, low
Pressing side is the side in parallel of converter.By taking great power bidirectional CLLLC mode of resonance DC/DC converter as an example, this converter not only may be used
It realizes the function of DC voltage transformation, transmitted in both directions energy and electrical isolation and has many advantages, such as power density height, it is high-efficient,
It is widely used in fields such as renewable energy, direct-flow distribution system and electric power electric transformers.
This converter at runtime, due to loss, resonant inductance, resonant capacitance, high frequency transformer between converter unit
The otherness of leakage reactance and no-load voltage ratio, the active power that will cause each converter unit transmission is unbalanced, causes converter unit DC voltage
It is inconsistent, cause converter to be not normally functioning.
For DC/DC converter series side DC voltage and the unbalanced problem of converter unit active power, current solution
Certainly method is that hardware is pressed, and in the DC capacitor both ends parallel connection equalizing resistance of power conversion unit series side, passes through different direct currents
Voltage acts on the otherness that is lost on resistance to reduce the unbalanced of DC voltage and active power, and this method is that one kind has
Difference control, can only reduce the inequality extent of DC voltage and active power between converter unit, reliability is not high, and increases
The loss and cost of converter, reduce converter operational efficiency.
Summary of the invention
The object of the present invention is to provide a kind of mode of resonance DC/DC inverter power balance control methods, to solve tradition
The low problem of method for balancing powers reliability.Present invention simultaneously provides a kind of mode of resonance DC/DC inverter power Balance routes
System.
To achieve the above object, the solution of the present invention includes a kind of mode of resonance DC/DC inverter power balance control method,
The input side of the DC/DC converter is series side, and outlet side is side in parallel, and the control method includes two layers of control, respectively
It is the total active power controller of converter and converter active power Balance route, the total active power controller of converter are as follows: right
Converter parallel connection side DC voltage carries out closed-loop control, the phase shifting angle of converter is obtained after treatment, according to the phase shifting angle
The phase difference that each convertor unit two sides correspond to alternating voltage is adjusted, realizes total active power controller；
The converter active power Balance route the following steps are included:
(1) the average value U of converter unit series side DC voltage is calculateddc_av, by each convertor unit series side DC voltage
UdciRespectively with average value Udc_avIt makes the difference, and carry out closed-loop control to result is made the difference, obtains the corresponding switching frequency of each convertor unit
Correction amount fsi；
(2) by each correction amount fsiWith original switching frequency fsIt is added, obtains revised each change of current list after treatment
The corresponding switching frequency f of membersi；
(3) according to the revised switching frequency f of each convertor unitsiCorresponding convertor unit is controlled；
Wherein, i=1,2 ..., N.
Realize the means of converter parallel connection side DC voltage closed-loop control are as follows: the actual side in parallel direct current of detection converter
Press Uo, by converter parallel connection side DC voltage instruction value Uo *With actual DC voltage U in side in paralleloIt makes the difference, utilizes pi regulator
Carry out closed-loop control.
Described pair makes the difference result and carries out closed-loop control using pi regulator realization, and the input signal of the pi regulator is each
Convertor unit series side DC voltage UdciWith the average value U of series side DC voltagedc_avDifference.
The phase shifting angle of the converter obtains after the processing by angle limiter.
The corresponding switching frequency f of the revised each convertor unitsiIt is obtained after processing by frequency limiter.
A kind of mode of resonance DC/DC inverter power balance control system, the input side of the DC/DC converter are series connection
Side, outlet side are side in parallel, and the control system includes:
The total active power controller module of converter is passed through for carrying out closed-loop control to converter parallel connection side DC voltage
The phase shifting angle that converter is obtained after processing adjusts the phase that each convertor unit two sides correspond to alternating voltage according to the phase shifting angle
Difference realizes total active power controller；
Converter active power equalization control module, including with lower unit:
Closed Loop Control Unit, for calculating the average value U of converter unit series side DC voltagedc_av, by each convertor unit
Series side DC voltage UdciRespectively with average value Udc_avIt makes the difference, and carry out closed-loop control to result is made the difference, obtains each convertor unit
The correction amount f of corresponding switching frequencysi；
Computing unit is used for each correction amount fsiWith original switching frequency fsIt is added, after obtaining amendment after treatment
The corresponding switching frequency f of each convertor unitsi；
Balance route unit, for according to the revised switching frequency f of each convertor unitsiCorresponding convertor unit is carried out
Control；
Wherein, i=1,2 ..., N.
Realize the means of converter parallel connection side DC voltage closed-loop control are as follows: the actual side in parallel direct current of detection converter
Press Uo, by converter parallel connection side DC voltage instruction value Uo *With actual DC voltage U in side in paralleloIt makes the difference, utilizes pi regulator
Carry out closed-loop control.
Described pair makes the difference result and carries out closed-loop control using pi regulator realization, and the input signal of the pi regulator is each
Convertor unit series side DC voltage UdciWith the average value U of series side DC voltagedc_avDifference.
The phase shifting angle of the converter obtains after the processing by angle limiter.
The corresponding switching frequency f of the revised each convertor unitsiIt is obtained after processing by frequency limiter.
Power balance control method provided by the invention include two layers control, be respectively the total active power controller of converter and
Converter active power Balance route, the total active power controller of converter are to carry out closed loop control to converter parallel connection side DC voltage
System, to obtain the phase shifting angle of converter；Converter active power Balance route is the direct current to the series side of each converter unit
Voltage carry out closed-loop control, by adjusting switching frequency come equalizing transform unit transmission active power, thus eliminate due to
Loss between converter unit, resonant inductance, resonant capacitance, high frequency transformer leakage reactance and no-load voltage ratio otherness etc. caused by wattful power
Rate cannot balancedly be transmitted to the problem of low-pressure side.The present invention is equivalent to base with converter unit dc-voltage balance and power equalization
Plinth, realizes converter series side dc-voltage balance and transimission power is balanced, and power equalization reliability is higher, ensure that resonance
The stable operation of type DC/DC converter, also, with it is traditional using the method for hardware realization power equalization compared with, without addition
Special hardware configuration, reduces input cost, and corresponding control software program need to only be added in control equipment, realize letter
It is single, balanced high reliablity, and the loss of converter is smaller, and correspondingly, converter operational efficiency is higher.
Detailed description of the invention
Fig. 1 is the topological schematic diagram of DC/DC converter；
Fig. 2 is the circuit diagram of two-way CLLLC mode of resonance DC/DC converter unit；
Fig. 3 is the schematic equivalent circuit of two-way CLLLC mode of resonance DC/DC converter unit；
Fig. 4 is Power balance control Method And Principle schematic diagram.
Specific embodiment
Mode of resonance DC/DC inverter power balance control method embodiment
Mode of resonance DC/DC inverter power balance control method provided by the invention is suitable for a variety of DC/DC converters,
DC/DC converter, can also be by other other than being made of two-way CLLLC mode of resonance DC/DC converter unit as shown in Figure 2
The DC/DC converter unit of circuit structure is constituted, and the present embodiment is tied below by taking two-way CLLLC mode of resonance DC/DC converter unit as an example
Attached drawing is closed to be further described in detail Power balance control method.In addition, in the present embodiment, as shown in Figure 1, high-pressure side is gone here and there
Connection setting, low-pressure side are arranged in parallel, then, the high-pressure side of converter is the series side of converter, and the low-pressure side of converter is to become
The side in parallel of parallel operation.
DC/DC converter includes n two-way CLLLC mode of resonance DC/DC converter units, as shown in Figure 1.
Firstly, the unbalanced reason of DC/DC inverter power is given below.
Two-way CLLLC mode of resonance DC/DC converter unit equivalent circuit is as shown in figure 3, when duty ratio is 50%, it is assumed that voltage
uabInitial phase be 0 °, voltage ucdInitial phase beAccording to Fourier analysis, the fundamental voltage of input and output can be obtained
Calculation formula are as follows:
Wherein, UiFor input direct-current voltage (i.e. high-pressure side DC voltage), UoTo export DC voltage (low-pressure side direct current
Pressure), ωsTo switch angular frequency.
The calculation formula of the impedance of resonance circuit are as follows:
In formula (3), by converter unit step down side parameter equivalent to high-pressure side, equivalent tank inductance is L2'=n2
(Lls2+L2), equivalent tank capacitor is C2'=C2/n2, R is the equivalent loss of system.
The calculation formula of converter unit input power (high-pressure side power) are as follows:
Pi=Uiidci=Po+Ploss (4)
In formula (4), idciFor converter unit high-pressure side DC current.
In a switch periods, the average value of converter unit output power (low side power) are as follows:
Each converter unit outlet side (low-pressure side) DC voltage is in parallel, therefore the low-pressure side DC voltage of each converter unit
UoIt is identical.Due to having a certain difference property such as resonant cavity impedance magnitude, high frequency transformer no-load voltage ratios, converter unit transmission is resulted in
Power PoIt is unbalanced.The series connection of converter unit high-pressure side, high-pressure side DC current idciIt is identical, as converter unit output power PoWith
P is lostlossWhen different, each converter unit high-pressure side DC voltage can be caused uneven.
It is above-mentioned to give the unbalanced reason of power, below in conjunction with above-mentioned reason to DC/DC inverter power Balance route
Strategy is described in detail.
From formula (3) it is found that the switching frequency for changing converter unit just changes after the circuit parameter of converter unit determines
The impedance of resonance circuit, from formula (5) it is found that after the impedance adjustment of resonance circuit, output power also changes, therefore passes through
The switching frequency for adjusting each converter unit can realize the purpose of power and electric voltage equalization.
DC/DC convertor controls strategy includes two layers of control, and upper layer is the total active power controller of converter, and lower layer is transformation
Device active power Balance route.
Wherein, the total active power controller of converter is controlled in entire converter level, it is therefore an objective to calculate transformation
The phase shifting angle of device.Converter active power Balance route is to realize Power balance control in converter unit level.
The total active power controller strategy Integral Thought of converter is: carrying out closed loop control to converter low-pressure side DC voltage
System, obtains the phase shifting angle of converter after treatment, specifically:
Detect the low-pressure side actual DC voltage U of DC/DC convertero, by converter low-pressure side DC voltage instruction value Uo *
With actual DC voltage UoIt makes the difference, carries out closed-loop control, the processing through over-angle limiter, i.e., through over-angle using pi regulator
The phase shifting angle of converter is obtained after height amplitude limiting processingAs shown in Figure 4.It is high that each converter unit is adjusted according to obtained phase shifting angle
Pressure side and low-pressure side correspond to the phase difference of alternating voltage, and then realize the total active power controller of converter, since this part belongs to
In routine techniques, just no longer illustrate here.In addition, then will since the principle of DC/DC converter is to become direct current to exchange
AC to DC, i.e. DC/DC converter are made of high-pressure side ac-dc conversion part and low-pressure side ac-dc conversion part, because
This, high-pressure side alternating voltage refers to that exchange side voltage, low-pressure side alternating voltage refer to low pressure in the ac-dc conversion part of high-pressure side
Side voltage is exchanged in top-cross DC converting part, i.e. converter unit high-pressure side and low-pressure side alternating voltage refers to the transformation in Fig. 2
The alternating current of device two sides.
Inverter power Balance route strategy the following steps are included:
(1) all converter unit high-pressure side DC bus-bar voltages are acquired, converter unit high-pressure side DC voltage is calculated
Average value Udc_av；
By each convertor unit high-pressure side DC voltage UdciRespectively with average value Udc_avMake the difference (i=1,2 ..., N), utilize
Pi regulator carries out closed-loop control, obtains the correction amount f of the corresponding switching frequency of each convertor unitsi；
(2) by the correction amount f of the corresponding switching frequency of each convertor unitsiWith the original switching frequency f of convertersPhase
Add, the processing through overfrequency limiter, i.e., obtains the corresponding switch of revised each convertor unit after overfrequency height clipping
Frequency fsi；
(3) the revised switching frequency f of each convertor unit has been obtained by above-mentioned stepssi, i.e., to each converter unit
Switching frequency is correspondingly adjusted, and changes the switch frequency of IGBT in each converter unit in real time with switching frequency adjusted
Rate, and then the frequency (such as power output side correspond to alternating current frequency) of corresponding alternating voltage in each converter unit is adjusted,
The purpose for realizing power and electric voltage equalization just no longer illustrates here since this control process belongs to routine techniques.
Therefore, in this two layers control, top level control is first carried out under normal circumstances, i.e., first carries out the total active power control of converter
Then system carries out lower layer's control, i.e. converter active power Balance route.
In above-described embodiment, high-pressure side is series side, and low-pressure side is side in parallel, as other embodiments, if high
Pressing side is side in parallel, if low-pressure side is series side, then, Balance route strategy just needs correspondingly to change, it is therein with it is low
The relevant control strategy in pressure side just needs to change into control high-pressure side, and control strategy relevant to high-pressure side just needs to change
Become controlling low-pressure side, still, based on basic principle be constant.
Mode of resonance DC/DC inverter power balance control system embodiment
Mode of resonance DC/DC inverter power balance control system in the present embodiment, including two modules are respectively: becoming
The total active power controller module of parallel operation and converter active power equalization control module.Wherein,
The total active power controller module of converter is passed through for carrying out closed-loop control to converter parallel connection side DC voltage
The phase shifting angle that converter is obtained after processing adjusts the phase difference that each convertor unit two sides correspond to alternating voltage according to phase shifting angle, real
Now total active power controller；
Converter active power equalization control module, including with lower unit:
Closed Loop Control Unit, for calculating the average value U of converter unit series side DC voltagedc_av, by each convertor unit
Series side DC voltage UdciRespectively with average value Udc_avIt makes the difference, and carry out closed-loop control to result is made the difference, obtains each convertor unit
The correction amount f of corresponding switching frequencysi；
Computing unit is used for each correction amount fsiWith original switching frequency fsIt is added, after obtaining amendment after treatment
The corresponding switching frequency f of each convertor unitsi；
Balance route unit, for according to the revised switching frequency f of each convertor unitsiCorresponding convertor unit is carried out
Control；
Wherein, i=1,2 ..., N.
Therefore, two control modules in the control system respectively correspond two control strategies in control method, i.e., should
Control system is substantially still control method, is described in detail due to being made that it in above-mentioned control method embodiment,
Here it just no longer illustrates.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Claims (10)
1. a kind of mode of resonance DC/DC inverter power balance control method, the input side of the DC/DC converter is series side,
Outlet side is side in parallel, which is characterized in that the control method includes two layers of control, is the total active power controller of converter respectively
With converter active power Balance route,
The total active power controller of converter are as follows: closed-loop control is carried out to converter parallel connection side DC voltage, after treatment
The phase shifting angle of converter is obtained, the phase difference that each convertor unit two sides correspond to alternating voltage is adjusted according to the phase shifting angle, is realized
Total active power controller；
The converter active power Balance route the following steps are included:
(1) the average value U of converter unit series side DC voltage is calculateddc_av, by each convertor unit series side DC voltage UdciPoint
Not with average value Udc_avIt makes the difference, and carry out closed-loop control to result is made the difference, obtains repairing for the corresponding switching frequency of each convertor unit
Positive quantity Δ fsi；
(2) by each correction amount fsiWith original switching frequency fsIt is added, obtains revised each convertor unit pair after treatment
The switching frequency f answeredsi；
(3) according to the revised switching frequency f of each convertor unitsiCorresponding convertor unit is controlled；
Wherein, i=1,2 ..., N.
2. mode of resonance DC/DC inverter power balance control method according to claim 1, which is characterized in that realize and become
The means of parallel operation parallel connection side DC voltage closed-loop control are as follows: the detection actual parallel connection side DC voltage U of convertero, by converter
Side DC voltage instruction value U in parallelo *With actual DC voltage U in side in paralleloIt makes the difference, carries out closed-loop control using pi regulator.
3. mode of resonance DC/DC inverter power balance control method according to claim 1, which is characterized in that described right
It makes the difference result and carries out closed-loop control using pi regulator realization, the input signal of the pi regulator is each convertor unit series side
DC voltage UdciWith the average value U of series side DC voltagedc_avDifference.
4. mode of resonance DC/DC inverter power balance control method according to claim 1 to 3, feature exist
In the phase shifting angle of the converter obtains after the processing by angle limiter.
5. mode of resonance DC/DC inverter power balance control method according to claim 1 to 3, feature exist
In the corresponding switching frequency f of the revised each convertor unitsiIt is obtained after processing by frequency limiter.
6. a kind of mode of resonance DC/DC inverter power balance control system, the input side of the DC/DC converter is series side,
Outlet side is side in parallel, which is characterized in that the control system includes:
The total active power controller module of converter, for carrying out closed-loop control to converter parallel connection side DC voltage, by processing
The phase shifting angle for obtaining converter afterwards adjusts the phase difference that each convertor unit two sides correspond to alternating voltage according to the phase shifting angle, real
Now total active power controller；
Converter active power equalization control module, including with lower unit:
Closed Loop Control Unit, for calculating the average value U of converter unit series side DC voltagedc_av, each convertor unit is connected
Side DC voltage UdciRespectively with average value Udc_avIt makes the difference, and carry out closed-loop control to result is made the difference, it is corresponding to obtain each convertor unit
Switching frequency correction amount fsi；
Computing unit is used for each correction amount fsiWith original switching frequency fsIt is added, obtains after treatment revised each
The corresponding switching frequency f of convertor unitsi；
Balance route unit, for according to the revised switching frequency f of each convertor unitsiCorresponding convertor unit is controlled
System；
Wherein, i=1,2 ..., N.
7. mode of resonance DC/DC inverter power balance control system according to claim 6, which is characterized in that realize and become
The means of parallel operation parallel connection side DC voltage closed-loop control are as follows: the detection actual parallel connection side DC voltage U of convertero, by converter
Side DC voltage instruction value U in parallelo *With actual DC voltage U in side in paralleloIt makes the difference, carries out closed-loop control using pi regulator.
8. mode of resonance DC/DC inverter power balance control system according to claim 6, which is characterized in that described right
It makes the difference result and carries out closed-loop control using pi regulator realization, the input signal of the pi regulator is each convertor unit series side
DC voltage UdciWith the average value U of series side DC voltagedc_avDifference.
9. being existed according to mode of resonance DC/DC inverter power balance control system, feature described in claim 6-8 any one
In the phase shifting angle of the converter obtains after the processing by angle limiter.
10. according to mode of resonance DC/DC inverter power balance control system, feature described in claim 6-8 any one
It is, the corresponding switching frequency f of the revised each convertor unitsiIt is obtained after processing by frequency limiter.
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| EP2568589B1 (en) * | 2011-09-08 | 2013-11-13 | ABB Technology AG | Multilevel converter comprising an active AC-DC converter and a resonant DC-DC converter and a control method for operating a multilevel converter |
| KR101385979B1 (en) * | 2012-11-26 | 2014-04-16 | 한국전기연구원 | Series resonant converter |
| CN103904905A (en) * | 2014-04-18 | 2014-07-02 | 燕山大学 | Isolated type three-port two-way DC/DC converter |
| CN104518661B (en) * | 2014-12-31 | 2016-10-05 | 北京理工大学 | Vertical control method on the distributing of ISOP modularity DC-DC converter |
| CN105048788B (en) * | 2015-06-04 | 2017-11-28 | 广西电网有限责任公司电力科学研究院 | The multiport electric power electric transformer and its control method of a kind of Mixed cascading structure |
| CN105471269A (en) * | 2015-12-30 | 2016-04-06 | 国网智能电网研究院 | Power electronic transformer power balance control method and system based on H-bridge chained mode |
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2017
- 2017-03-21 CN CN201710170804.XA patent/CN106877674B/en active Active
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