CN106877674A - Mode of resonance DC/DC inverter powers balance control method and control system - Google Patents
Mode of resonance DC/DC inverter powers balance control method and control system Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 claims description 70
- 230000010363 phase shift Effects 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 description 8
- 238000011217 control strategy Methods 0.000 description 8
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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
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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
- 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
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- 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
It is respectively the total active power controller of converter and inverter power Balance route the present invention relates to mode of resonance DC/DC inverter powers balance control method and control system, including two-layer control, the total active power controller of converter is used to obtain the phase shifting angle of converter；In inverter power Balance route, closed-loop control is carried out to each converter unit, obtain the correction of the corresponding switching frequency of each convertor unit；Then it is calculated the corresponding switching frequency of revised each convertor unit；Balance route is carried out to corresponding convertor unit according to the revised switching frequency of each convertor unit.By adjusting the active power that switching frequency is transmitted come equalizing transform unit, realize converter series side dc-voltage balance and transimission power is balanced, it is ensured that the stable operation of DC/DC converters, and, special hardware configuration need not be added, input cost is reduced.
Description
Technical Field
The invention relates to a power balance control method and a power balance control system for a resonant DC/DC converter, and belongs to the technical field of power balance control of DC/DC converters.
Background
The mainstream topology of the DC/DC converter is a one-side-series-one-side-parallel type, and as shown in fig. 1, the DC/DC converter includes n number of conversion units, and these conversion units are arranged in series, also called a cascade arrangement, and arranged in parallel on the other side, so that the side where the conversion units are arranged in series is called the series side of the converter, and the side where the conversion units are arranged in parallel is called the parallel side of the converter, and if the high-voltage side is arranged in series and the low-voltage side is arranged in parallel in fig. 1, the high-voltage side is the series side of the converter, and the low-voltage side is the parallel side of. Taking a high-power bidirectional CLLLC resonant DC/DC converter as an example, the converter not only can realize the functions of direct-current voltage transformation, bidirectional energy transmission and electrical isolation, but also has the advantages of high power density, high efficiency and the like, and is widely applied to the fields of renewable energy sources, direct-current power distribution systems, power electronic transformers and the like.
When the converter operates, active power transmitted by each conversion unit is unbalanced due to the difference of loss, resonance inductance, resonance capacitance, leakage reactance of a high-frequency transformer and transformation ratio among the conversion units, so that direct-current voltages of the conversion units are inconsistent, and the converter cannot normally operate.
Aiming at the problem of unbalanced direct current voltage and active power of a conversion unit at the serial side of a DC/DC converter, the existing solution is hardware voltage sharing, voltage sharing resistors are connected in parallel at two ends of a direct current capacitor at the serial side of the power conversion unit, and the unbalance of the direct current voltage and the active power is reduced through the difference of loss of different direct current voltages acting on the resistors.
Disclosure of Invention
The invention aims to provide a power balance control method of a resonant DC/DC converter, which is used for solving the problem of low reliability of the traditional power balance method. The invention also provides a power balance control system of the resonant DC/DC converter.
In order to achieve the above object, the present invention provides a method for controlling power balance of a resonant DC/DC converter, the DC/DC converter having a series side and a parallel side, the method comprising two layers of control, namely, total active power control of the converter and active power balance control of the converter, the total active power control of the converter comprising: carrying out closed-loop control on direct-current voltage at the parallel side of the converter, processing to obtain a phase shift angle of the converter, and adjusting phase difference of corresponding alternating-current voltage at two sides of each current conversion unit according to the phase shift angle to realize total active power control;
the active power balance control of the converter comprises the following steps:
(1) calculating the average value U of the DC voltage at the serial side of the conversion unitdc_avThe direct current voltage U on the serial side of each current conversion unitdciAre respectively compared with the average value Udc_avMaking difference, and performing closed-loop control on the difference result to obtain correction quantity delta f of switching frequency corresponding to each commutation unitsi；
(2) Each correction amount deltafsiWith the initial switching frequency fsAdding the obtained sum to obtain the corrected switching frequency f corresponding to each commutation unitsi；
(3) According to the corrected switching frequency f of each current conversion unitsiControlling the corresponding current conversion unit;
wherein, i is 1, 2, … … and N.
The means for realizing the closed-loop control of the DC voltage at the parallel side of the converter is as follows: detecting the actual parallel-side DC voltage U of the converteroA DC voltage command value U of the parallel side of the convertero *With actual parallel side DC voltage UoAnd (5) performing closed-loop control by using a PI regulator.
The closed-loop control of the difference making result is realized by adopting a PI (proportional integral) regulator, and the input signal of the PI regulator is the direct current voltage U at the serial side of each converter unitdciWith the average value U of the series-side DC voltagedc_avThe difference of (a).
The phase shift angle of the converter is obtained after the processing of the angle limiter.
The corrected switching frequency f corresponding to each current conversion unitsiObtained after processing by a frequency limiter.
A resonant type DC/DC converter power balance control system, the DC/DC converter having a series side and a parallel side, the control system comprising:
the converter total active power control module is used for carrying out closed-loop control on direct current voltage at the parallel side of the converter, obtaining a phase shift angle of the converter after processing, and adjusting phase difference of corresponding alternating current voltage at two sides of each current conversion unit according to the phase shift angle to realize total active power control;
the active power balance control module of the converter comprises the following units:
a closed-loop control unit for calculating the average value U of DC voltage at the serial side of the conversion unitdc_avThe direct current voltage U on the serial side of each current conversion unitdciAre respectively compared with the average value Udc_avMaking difference, and performing closed-loop control on the difference result to obtain correction quantity delta f of switching frequency corresponding to each commutation unitsi；
A calculation unit for calculating each correction amount Δ fsiWith the initial switching frequency fsAdding the obtained sum to obtain the corrected switching frequency f corresponding to each commutation unitsi；
A balance control unit for correcting the switching frequency f according to each current conversion unitsiControlling the corresponding current conversion unit;
wherein, i is 1, 2, … … and N.
The means for realizing the closed-loop control of the DC voltage at the parallel side of the converter is as follows: detecting the actual parallel-side DC voltage U of the converteroA DC voltage command value U of the parallel side of the convertero *With actual parallel side DC voltage UoMaking difference, and closing by using PI regulatorAnd (4) controlling a loop.
The closed-loop control of the difference making result is realized by adopting a PI (proportional integral) regulator, and the input signal of the PI regulator is the direct current voltage U at the serial side of each converter unitdciWith the average value U of the series-side DC voltagedc_avThe difference of (a).
The phase shift angle of the converter is obtained after the processing of the angle limiter.
The corrected switching frequency f corresponding to each current conversion unitsiObtained after processing by a frequency limiter.
The power balance control method provided by the invention comprises two layers of control, namely total active power control of the converter and active power balance control of the converter, wherein the total active power control of the converter is to carry out closed-loop control on direct-current voltage at the parallel side of the converter so as to obtain a phase shift angle of the converter; the active power balance control of the converter is to perform closed-loop control on direct-current voltage on the serial side of each conversion unit, and balance the active power transmitted by the conversion units by adjusting the switching frequency, so that the problem that the active power cannot be transmitted to the low-voltage side in a balanced manner due to loss among the conversion units, resonance inductance, resonance capacitance, leakage reactance of a high-frequency transformer, difference of transformation ratio and the like is solved. The invention realizes the direct current voltage balance and the transmission power balance of the series side of the converter on the basis of the equivalent direct current voltage balance and the power balance of the conversion unit, has higher reliability of the power balance, ensures the stable operation of the resonant DC/DC converter, and compared with the traditional method for realizing the power balance by utilizing hardware, the invention does not need to add a special hardware structure, reduces the investment cost, only needs to add a corresponding control software program in the control equipment, has simple realization, high balance reliability, smaller loss of the converter and higher operation efficiency of the converter correspondingly.
Drawings
FIG. 1 is a schematic topology of a DC/DC converter;
FIG. 2 is a circuit schematic of a bidirectional CLLLC resonant DC/DC conversion unit;
FIG. 3 is an equivalent circuit schematic diagram of a bidirectional CLLLC resonant DC/DC conversion unit;
fig. 4 is a schematic diagram of a power equalization control method.
Detailed Description
Embodiments of a method for controlling power balance of a resonant DC/DC converter
The power balance control method for the resonant DC/DC converter provided by the invention is suitable for various DC/DC converters, the DC/DC converter is composed of a bidirectional CLLLC resonant DC/DC conversion unit as shown in FIG. 2, and can also be composed of DC/DC conversion units with other circuit structures, the bidirectional CLLLC resonant DC/DC conversion unit is taken as an example in the embodiment, and the power balance control method is further described in detail with reference to the attached drawings. In the present embodiment, as shown in fig. 1, the high-voltage side is connected in series and the low-voltage side is connected in parallel, and the high-voltage side of the inverter is the series side of the inverter and the low-voltage side of the inverter is the parallel side of the inverter.
The DC/DC converter comprises n bidirectional CLLLC resonant type DC/DC conversion units, as shown in fig. 1.
First, the reason for the DC/DC converter power imbalance is given below.
Fig. 3 shows an equivalent circuit of a bidirectional CLLLC resonant DC/DC conversion unit, wherein a voltage u is assumed when a duty ratio is 50%abIs at an initial phase of 0 DEG, and a voltage ucdHas an initial phase ofAccording to the fourier analysis, the calculation formula of the input and output fundamental voltage can be obtained as follows:
wherein, UiFor input of a DC voltage (i.e. a high-side DC voltage), UoTo output a DC voltage (low-side DC voltage), ωsIs the switching angular frequency.
The impedance of the resonant circuit is calculated as:
in the formula (3), the parameters of the low-voltage side of the transformer of the conversion unit are equivalent to the high-voltage side, and the equivalent resonance inductance is L2'＝n2(Lls2+L2) Equivalent resonant capacitance of C2'＝C2/n2And R is the system equivalent loss.
The calculation formula of the input power (high-voltage side power) of the conversion unit is as follows:
Pi＝Uiidci＝Po+Ploss(4)
in the formula (4), idciIs the direct current on the high-voltage side of the conversion unit.
In one switching cycle, the average value of the output power (low-side power) of the conversion unit is:
the DC voltages at the output side (low voltage side) of each conversion unit are connected in parallel, so that the DC voltage U at the low voltage side of each conversion unitoThe same is true. Due to the impedance of the resonant cavity and the transformation ratio of the high-frequency transformerEtc. have a certain difference, resulting in the transmission power P of the conversion unitoIs not uniform. The high-voltage side of the conversion units are connected in series, and the high-voltage side direct current idciWhen the output power P of the conversion unit is the sameoAnd loss PlossWhen the voltages are different, the dc voltages at the high voltage side of the respective conversion units are unbalanced.
The reason for the power imbalance is given above, and the DC/DC converter power balance control strategy will be described in detail below with reference to the reason.
As can be seen from equation (3), changing the switching frequency of the transforming element changes the impedance of the resonant circuit when the circuit parameters of the transforming element are determined, and as can be seen from equation (5), the output power of the resonant circuit changes after the impedance of the resonant circuit is adjusted, so that the purpose of power and voltage equalization can be achieved by adjusting the switching frequency of each transforming element.
The control strategy of the DC/DC converter comprises two layers of control, wherein the upper layer is used for controlling the total active power of the converter, and the lower layer is used for controlling the active power balance of the converter.
The total active power control of the converter is controlled on the whole converter level, and the aim is to calculate the phase shift angle of the converter. The active power balance control of the converter is realized on the level of a conversion unit.
The overall concept of the total active power control strategy of the converter is as follows: the method comprises the following steps of carrying out closed-loop control on direct-current voltage at the low-voltage side of the converter, and obtaining a phase shift angle of the converter after processing, wherein the closed-loop control specifically comprises the following steps:
detecting the actual DC voltage U on the low-voltage side of a DC/DC converteroA DC voltage command value U of the low-voltage side of the convertero *And the actual DC voltage UoMaking difference, utilizing PI regulator to make closed-loop control, and making angle amplitude limiter treatment to obtain phase-shifting angle of converterAs shown in fig. 4. According to the result ofThe phase shift angle adjusts the phase difference of the corresponding alternating voltage of the high-voltage side and the low-voltage side of each conversion unit, and further realizes the total active power control of the converter. Since the DC/DC converter converts DC into ac and then converts ac into DC, that is, the DC/DC converter is composed of a high-side ac/DC conversion section and a low-side ac/DC conversion section, the high-side ac voltage refers to the ac-side voltage in the high-side ac/DC conversion section, the low-side ac voltage refers to the ac-side voltage in the low-side ac/DC conversion section, that is, the high-side and low-side ac voltages of the conversion means refer to the ac power on both sides of the transformer in fig. 2.
The converter power balance control strategy comprises the following steps:
(1) collecting all the DC bus voltages at the high-voltage side of the conversion units, and calculating the average value U of the DC voltages at the high-voltage side of the conversion unitsdc_av；
The high-voltage side direct current voltage U of each current conversion unitdciAre respectively compared with the average value Udc_avMaking difference (i is 1, 2, … … and N), and performing closed-loop control by using a PI regulator to obtain correction quantity delta f of switching frequency corresponding to each commutation unitsi；
(2) Correcting amount delta f of switching frequency corresponding to each commutation unitsiAnd the initial switching frequency f of the convertersAdding, processing by a frequency limiter, namely obtaining the corrected switching frequency f corresponding to each commutation unit after frequency amplitude limitingsi；
(3) The corrected switching frequency f of each commutation unit is obtained through the stepssiThat is, the switching frequency of each conversion unit is adjusted accordingly, the switching frequency of the IGBT in each conversion unit is changed in real time by the adjusted switching frequency, and then the frequency of the corresponding ac voltage in each conversion unit (for example, the frequency of the ac power corresponding to the output side of the electric energy) is adjusted, so as to achieve the purpose of power and voltage balanceAnd (6) specifically explaining.
Therefore, in the two-layer control, the upper-layer control, i.e., the total active power control of the converter, is generally performed first, and then the lower-layer control, i.e., the active power balance control of the converter, is performed.
In the above embodiments, the high-voltage side is the series side, and the low-voltage side is the parallel side, as another embodiment, if the high-voltage side is the parallel side and the low-voltage side is the series side, then the equalization control strategy needs to be changed accordingly, wherein the control strategy related to the low-voltage side needs to be changed to control the high-voltage side, and the control strategy related to the high-voltage side needs to be changed to control the low-voltage side, but the basic principle is not changed.
Embodiments of a power balance control system for a resonant DC/DC converter
The power balance control system of the resonant DC/DC converter in this embodiment includes two modules, which are respectively: the device comprises a converter total active power control module and a converter active power balance control module. Wherein,
the converter total active power control module is used for carrying out closed-loop control on direct current voltage at the parallel side of the converter, obtaining a phase shift angle of the converter after processing, and adjusting phase difference of corresponding alternating current voltage at two sides of each current conversion unit according to the phase shift angle to realize total active power control;
the active power balance control module of the converter comprises the following units:
a closed-loop control unit for calculating the average value U of DC voltage at the serial side of the conversion unitdc_avThe direct current voltage U on the serial side of each current conversion unitdciAre respectively compared with the average value Udc_avMaking difference, and performing closed-loop control on the difference result to obtain correction quantity delta f of switching frequency corresponding to each commutation unitsi；
A calculation unit for calculating each correction amount Δ fsiWith the initial switching frequency fsAdding, processingThen obtaining the corrected switching frequency f corresponding to each commutation unitsi；
A balance control unit for correcting the switching frequency f according to each current conversion unitsiControlling the corresponding current conversion unit;
wherein, i is 1, 2, … … and N.
Therefore, the two control modules in the control system respectively correspond to the two control strategies in the control method, that is, the control system is still essentially the control method, and since the control method has been described in detail in the above control method embodiment, the detailed description is omitted here.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (10)
1. A power balance control method for a resonance type DC/DC converter, the DC/DC converter is provided with a series side and a parallel side, and is characterized in that the control method comprises two layers of control, namely total active power control of the converter and active power balance control of the converter,
the total active power control of the converter is as follows: carrying out closed-loop control on direct-current voltage at the parallel side of the converter, processing to obtain a phase shift angle of the converter, and adjusting phase difference of corresponding alternating-current voltage at two sides of each current conversion unit according to the phase shift angle to realize total active power control;
the active power balance control of the converter comprises the following steps:
(1) calculating the average value U of the DC voltage at the serial side of the conversion unitdc_avThe direct current voltage U on the serial side of each current conversion unitdciAre respectively compared with the average value Udc_avMaking difference, and performing closed-loop control on the difference result to obtain correction quantity delta f of switching frequency corresponding to each commutation unitsi；
(2) Each correction amount deltafsiWith the initial switching frequency fsAdding the obtained sum to obtain the corrected switching frequency f corresponding to each commutation unitsi；
(3) According to the corrected switching frequency f of each current conversion unitsiControlling the corresponding current conversion unit;
wherein, i is 1, 2, … … and N.
2. The power balance control method of the resonance type DC/DC converter according to claim 1, wherein the means for realizing the closed-loop control of the DC voltage at the parallel side of the converter is as follows: detecting the actual parallel-side DC voltage U of the converteroA DC voltage command value U of the parallel side of the convertero *With actual parallel side DC voltage UoAnd (5) performing closed-loop control by using a PI regulator.
3. The power balance control method of the resonant DC/DC converter according to claim 1, wherein the closed-loop control of the difference result is implemented by using a PI (proportional integral) regulator, and an input signal of the PI regulator is a direct current voltage U at the serial side of each converter unitdciWith the average value U of the series-side DC voltagedc_avThe difference of (a).
4. A method for controlling power balance of a resonant DC/DC converter according to any of claims 1-3, wherein the phase shift angle of the converter is obtained after processing by an angle limiter.
5. The method according to any one of claims 1 to 3, wherein the corrected switching frequency f corresponding to each commutation cell is set to the same valuesiObtained after processing by a frequency limiter.
6. A resonant type DC/DC converter power balance control system, the DC/DC converter having a series side and a parallel side, the control system comprising:
the converter total active power control module is used for carrying out closed-loop control on direct current voltage at the parallel side of the converter, obtaining a phase shift angle of the converter after processing, and adjusting phase difference of corresponding alternating current voltage at two sides of each current conversion unit according to the phase shift angle to realize total active power control;
the active power balance control module of the converter comprises the following units:
a closed-loop control unit for calculating the average value U of DC voltage at the serial side of the conversion unitdc_avThe direct current voltage U on the serial side of each current conversion unitdciAre respectively compared with the average value Udc_avMaking difference, and performing closed-loop control on the difference result to obtain correction quantity delta f of switching frequency corresponding to each commutation unitsi；
A calculation unit for calculating each correction amount Δ fsiWith the initial switching frequency fsAdding the obtained sum to obtain the corrected switching frequency f corresponding to each commutation unitsi；
A balance control unit for correcting the switching frequency f according to each current conversion unitsiControlling the corresponding current conversion unit;
wherein, i is 1, 2, … … and N.
7. The power balance control system of the resonant DC/DC converter according to claim 6, wherein the means for realizing the closed-loop control of the DC voltage at the parallel side of the converter is: detecting the actual parallel-side DC voltage U of the converteroA DC voltage command value U of the parallel side of the convertero *With actual parallel side DC voltage UoAnd (5) performing closed-loop control by using a PI regulator.
8. The power balance control system of the resonant DC/DC converter according to claim 6, wherein the closed-loop control of the difference result is implemented by using a PI (proportional integral) regulator, and an input signal of the PI regulator is a direct current voltage U at the serial side of each converter unitdciWith the average value U of the series-side DC voltagedc_avThe difference of (a).
9. The resonant DC/DC converter power balance control system according to any of claims 6-8, wherein the phase shift angle of the converter is obtained after processing by an angle limiter.
10. The power balance control system for the resonant DC/DC converter according to any one of claims 6 to 8, wherein the modified switching frequency f corresponding to each commutation cellsiObtained after processing by a frequency limiter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557026A (en) * | 2019-08-07 | 2019-12-10 | 苏州汇川联合动力系统有限公司 | High-voltage direct-current conversion circuit and vehicle-mounted charger |
| CN110768531A (en) * | 2018-07-27 | 2020-02-07 | 株洲中车时代电气股份有限公司 | Bidirectional high-frequency isolation type DC/DC module |
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| CN110768531A (en) * | 2018-07-27 | 2020-02-07 | 株洲中车时代电气股份有限公司 | Bidirectional high-frequency isolation type DC/DC module |
| CN110557026A (en) * | 2019-08-07 | 2019-12-10 | 苏州汇川联合动力系统有限公司 | High-voltage direct-current conversion circuit and vehicle-mounted charger |
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