CN112491273B - Active bridge converter and direct current component suppression method thereof - Google Patents
Active bridge converter and direct current component suppression method thereof Download PDFInfo
- Publication number
- CN112491273B CN112491273B CN202011492144.5A CN202011492144A CN112491273B CN 112491273 B CN112491273 B CN 112491273B CN 202011492144 A CN202011492144 A CN 202011492144A CN 112491273 B CN112491273 B CN 112491273B
- Authority
- CN
- China
- Prior art keywords
- winding
- converter
- voltage
- square wave
- alternating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application discloses an active bridge converter and a direct current component suppression method thereof, which suppress direct current components in alternating current side currents of winding converters in a pure software control mode. The method comprises the following steps: in each switching period, obtaining the average value I of the current on the alternating current side of the jth winding converter j J is 1, 2, …, n is the total number of winding converters of the three phases of the active bridge converter; given 0, the average value of the current I on the alternating current side of the jth winding converter is compared with the average value of the current I on the alternating current side of the jth winding converter j Making a difference, calculating the difference value by the regulator, and outputting a compensation quantity delta U j And the superposed voltage is superposed on the duty ratio of the square wave of the alternating-current side voltage of the winding converter.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an active bridge converter and a direct-current component suppression method thereof.
Background
Fig. 1 shows an active bridge converter with identical three-phase topologies, each of which comprises: the transformer comprises at least one transformer, each transformer is provided with at least one primary side winding and at least one secondary side winding, each primary side winding is connected with a DC/AC converter, and each secondary side winding is connected with an AC/DC converter. The aforementioned DC/AC converter and AC/DC converter are both referred to as winding converters.
Due to the reasons of inconsistent line parameters, dead zones, control time sequences and the like, direct current components are inevitably generated in alternating current side currents of the winding converters, soft switching of switching devices is influenced, and even overcurrent is caused. The more common solution is to serially connect dc blocking capacitors to the ac side of each winding transformer, but this results in increased hardware cost.
Disclosure of Invention
In view of the above, the present invention provides an active bridge converter and a method for suppressing a dc component thereof, so as to suppress a dc component in an ac side current of each winding converter in a pure software control manner.
A method for suppressing direct current component of an active bridge converter, wherein three-phase topologies of the active bridge converter are the same, and each phase topology comprises the following steps: the transformer comprises at least one transformer, at least one primary side winding and at least one secondary side winding, wherein each primary side winding is connected with a DC/AC converter, each secondary side winding is connected with an AC/DC converter, and the DC/AC converter and the AC/DC converter are called winding converters;
the method for suppressing the direct-current component of the active bridge converter comprises the following steps:
in each switching period, obtaining the average value I of the alternating current side current of the jth winding converter j J is 1, 2, …, n is the total number of winding converters of the three phases of the active bridge converter;
taking 0 as a given value, and comparing the given value with the average value I of the current on the alternating current side of the jth winding converter j Making a difference, calculating the difference value through a regulator, and outputting the duty ratio compensation quantity delta U of the alternating-current side voltage square wave of the winding converter j And the superposed voltage is superposed on the duty ratio of the square wave of the alternating-current side voltage of the winding converter.
Optionally, in the active bridge converter, when the phase shift angle adjustment in the winding converter and the phase shift angle adjustment between the primary winding converter and the secondary winding converter all use a rising edge of a voltage square wave as a phase shift starting point, the phase shift angle adjustment is superimposed on a duty ratio of an ac side voltage square wave of the winding converter, and the method includes:
when Δ U j When the voltage is more than or equal to 0, delaying the falling edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U j When the voltage is less than 0, the falling edge of the square wave of the alternating-current side voltage of the jth winding converter is advanced by a compensation quantity delta U j The time taken;
wherein the falling edge refers to a high-level to zero level falling edge or a high-level to negative level falling edge.
Optionally, in the active bridge converter, when phase shift angle adjustment in the winding converter and phase shift angle adjustment between the primary winding converter and the secondary winding converter both use a falling edge of a voltage square wave as a phase shift phase starting point, the phase shift angle adjustment is superimposed on a duty ratio of an ac side voltage square wave of the winding converter, and the method includes:
when Δ U j When the number of the windings is more than or equal to 0, changing the jth winding into the number of the windingsThe rising edge of the AC side voltage square wave of the converter is advanced by a compensation quantity delta U j The time taken;
when Δ U j When the voltage is less than 0, delaying the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation quantity delta U j The time taken;
wherein the rising edge refers to a rising edge from a zero level to a high level or a rising edge from a negative level to a high level.
Alternatively, for any one of the above-disclosed methods for suppressing the dc component of the active bridge converter, the method is applied to the local controller of the jth winding converter.
Optionally, the regulator is a P or PI regulator.
An active bridge converter comprising main circuits and a control system, the three-phase topologies of the main circuits being identical, each phase topology thereof comprising: the transformer comprises at least one transformer, at least one primary side winding and at least one secondary side winding, wherein each primary side winding is connected with a DC/AC converter, each secondary side winding is connected with an AC/DC converter, and the DC/AC converter and the AC/DC converter are called winding converters;
the control system is used for acquiring the average value I of the alternating current side current of the jth winding converter in each switching period j J is 1, 2, …, n is the total number of winding converters of the three phases of the active bridge converter; taking 0 as a given value, and comparing the given value with the average value I of the current on the alternating current side of the jth winding converter j Making difference, and outputting the duty ratio compensation quantity delta U of the alternating-current side voltage square wave of the winding converter after the difference value is calculated by the regulator j And the direct current voltage is superposed on the duty ratio of the alternating current side voltage square wave of the winding converter.
Optionally, when the phase shift angle adjustment in the winding transformer and the phase shift angle adjustment between the primary winding transformer and the secondary winding transformer both use the rising edge of the voltage square wave as the phase shift starting point, the step of superimposing the phase shift starting point on the duty ratio of the ac side voltage square wave of the winding transformer executed by the control system specifically includes:
when Δ U j When the voltage is more than or equal to 0, delaying the falling edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U j When the voltage is less than 0, the falling edge of the square wave of the alternating-current side voltage of the jth winding converter is advanced by a compensation quantity delta U j The time taken;
wherein the falling edge refers to a high-level to zero level falling edge or a high-level to negative level falling edge.
Optionally, when the phase shift angle adjustment in the winding transformer and the phase shift angle adjustment between the primary winding transformer and the secondary winding transformer both use the falling edge of the voltage square wave as the phase shift starting point, the step of superimposing the falling edge on the duty ratio of the ac side voltage square wave of the winding transformer executed by the control system specifically includes:
when Δ U is measured j When the voltage is more than or equal to 0, advancing the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U j When the voltage is less than 0, delaying the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation quantity delta U j The time taken;
wherein the rising edge refers to a rising edge from a zero level to a high level or a rising edge from a negative level to a high level.
Optionally, for any of the active bridge converters disclosed above, the control system comprises a local controller for the jth winding converter; the local controller of the jth winding transformer is used for independently controlling the winding transformer.
Optionally, the regulator is a P or PI regulator.
According to the technical scheme, for each winding converter, 0 is used as a given value, a direct-current component in alternating-current side current of the winding converter is used as a feedback value, a compensation quantity is calculated by a regulator according to a difference value of the given value and the feedback value, the compensation quantity is superposed on a duty ratio of alternating-current side voltage square waves of the winding converter, and the duty ratio is finely adjusted, so that the direct-current component approaches to the given value 0, and the direct-current component in the alternating-current side current of the winding converter is restrained through a pure software control mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an active bridge converter;
fig. 2 is a flowchart of a method for suppressing a dc component of an active bridge converter according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of an AC side voltage Up of a DC/AC converter and an AC side voltage Us of an AC/DC converter according to an embodiment of the present invention;
FIG. 4 is a waveform diagram of an AC-side voltage Up of a DC/AC converter and an AC-side voltage Us of an AC/DC converter according to an embodiment of the present invention;
FIG. 5 is a timing diagram of square-wave AC side voltages of transformers with different windings in the same transformer according to an embodiment of the present invention;
fig. 6 is a timing diagram of an ac side voltage square wave of a transformer with different windings in the same transformer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a method for suppressing a direct current component of an active bridge converter, which is applied to the active bridge converter shown in figure 1. Referring to fig. 2, the method for suppressing the dc component of the active bridge converter includes:
step S01: in each switching period, obtaining the average value I of the alternating current side current of the jth winding converter j J is 1, 2, …, n is the total number of winding converters of the three phases of the active bridge converter.
Specifically, the average value of the alternating-current side current of the winding converter in the switching period is obtained through a hardware conditioning circuit according to the instantaneous value of the alternating-current side current of the winding converter. Since the average value of the alternating current in one switching period is zero, the average value of the alternating-current side current of one winding converter in one switching period is substantially the direct-current component in the alternating-current side current of the winding converter in the switching period.
Step S02: taking 0 as a given value, and comparing the given value with the average value I of the alternating current side current of the jth winding converter j Making difference, calculating the difference value by a regulator (such as P or PI regulator), and outputting the duty ratio compensation quantity delta U of the alternating-current side voltage square wave of the winding converter j And the superposed voltage is superposed on the duty ratio of the square wave of the alternating-current side voltage of the winding converter.
Specifically, the duty cycle is the percentage of the total time that the controlled circuit is turned on during a switching cycle. Correspondingly, the duty ratio of the alternating-current side voltage square wave of a winding converter means that the high level time of the alternating-current side voltage square wave of the winding converter accounts for the percentage of the total time in one switching period, and the duty ratio is usually 50%. In a switching period, the time ratio of the high level and the low level of the winding converter is controlled by controlling the duty ratio of the alternating-current side voltage square wave of the winding converter, so that the control of the average value of the alternating-current side voltage square wave of the winding converter is realized, and the control of the average value of the alternating-current side current of the winding converter is further realized.
Based on the above, in each switching period, for the jth winding converter, the embodiment of the invention takes 0 as a given value, and takes the average value I of the alternating-current side current of the winding converter as the average value j As a feedback value, the regulator calculates a compensation amount Δ U according to a difference between the given value and the feedback value j Superposed on the duty ratio of the square wave of the AC side voltage of the winding converter, and the duty ratio is finely adjusted to enable I j And the current approaches zero, so that the direct-current component in the alternating-current side current of the winding converter is suppressed in a pure software control mode.
Wherein the compensation amount Delta U is adjusted j The superposition to the duty ratio of the square wave of the alternating-current side voltage of the jth winding converter can be realized by adopting any one of the following two schemes:
scheme 1: when Δ U j When the voltage is more than or equal to 0, delaying the falling edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken (as shown in fig. 3, Up in fig. 3 is the AC side voltage waveform of any one of the DC/AC converters, Us is the AC side voltage waveform of any one of the AC/DC converters, and the dotted line in fig. 3 indicates the original falling edge); when Δ U is measured j If the voltage is less than 0, advancing the falling edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken. The falling edge in scheme 1 refers to a high-to-zero level falling edge or a high-to-negative level falling edge.
Scheme 2: when Δ U j When the voltage is more than or equal to 0, advancing the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken (as shown in fig. 4, Up in fig. 4 is the AC side voltage waveform of any one of the DC/AC converters, Us is the AC side voltage waveform of any one of the AC/DC converters, and the broken line in fig. 4 indicates the original rising edge); when Δ U j When the voltage is less than 0, delaying the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation quantity delta U j The time taken. The rising edge in scheme 2 refers to a rising edge from zero level to high level or a rising edge from negative level to high level.
In order to ensure that the embodiment of the present invention does not affect the adjustment of the phase shift angle inside the winding transformer and the adjustment of the phase shift angle between the primary winding transformer (i.e., the DC/AC converter) and the secondary winding transformer (i.e., the AC/DC converter) in the dynamic compensation process of the duty ratio, the embodiment of the present invention recommends a more preferable scheme from the above two schemes with reference to the phase shift reference. The specific description is as follows:
in the active bridge converter, the phase shift angle adjustment of the winding transformer and the phase shift angle adjustment between the primary winding transformer and the secondary winding transformer are both performed by using the rising edge of the voltage square wave as the phase shift starting point (as shown in fig. 5) or using the falling edge of the voltage square wave as the phase shift starting point (as shown in fig. 6). Fig. 5 and 6 each exemplify a transformer with windings under the same transformer (in the same transformer, the reference voltages corresponding to the transformers in the same phase are equal, and the reference voltages corresponding to the transformers at the same three-phase position are different from each other by 120 ° with the ac side voltage of the first primary-side transformer as the reference voltage), wherein: u1p is the ac side voltage waveform of the 1 st primary-side winding converter; u1s is the AC side voltage waveform of the 1 st secondary side winding converter; uip is an alternating-current side voltage waveform of the ith primary-side winding converter, i is 2, 3, … and m, and m is the total number of the primary-side winding converters; uks is the AC side voltage waveform of the kth secondary side winding converter, k is 2, 3, … and r, r is the total number of the secondary side winding converters; d1 is the phase shift angle in the 1 st primary winding transformer; di is the phase shift angle in the ith primary side winding transformer; θ 1ps is a phase shift angle between the 1 st secondary side winding transformer and the 1 st primary side winding transformer; θ kps is a phase shift angle between the kth secondary side winding transformer and the 1 st primary side winding transformer; θ i1 is the phase shift angle between the ith primary-side winding transformer and the 1 st primary-side winding transformer.
In the active bridge converter, when the phase shift angle adjustment in the winding converter and the phase shift angle adjustment between the primary winding converter and the secondary winding converter both use the rising edge of the voltage square wave as the phase shift phase starting point, the embodiment of the invention uses the compensation quantity delta U as the phase shift phase starting point j When the voltage is superimposed on the duty ratio of the voltage square wave on the alternating-current side of the jth winding converter, the scheme 1 for shifting the falling edge of the voltage square wave is recommended. In an active bridge converter, when phase angle adjustment is performed in a winding converter, oneWhen the phase shift angle adjustment between the secondary side winding converter and the secondary side winding converter takes the falling edge of the voltage square wave as the phase shift phase starting point, the embodiment of the invention adjusts the compensation quantity delta U j Superimposed on the duty cycle of the voltage square wave on the ac side of the j-th winding transformer, it is recommended to use scheme 2 described above for shifting the rising edge of the voltage square wave. Therefore, the embodiment of the invention does not influence the phase shift angle adjustment in the winding converter and the phase shift angle adjustment between the primary side converter and the secondary side converter in the dynamic compensation process of the duty ratio.
Optionally, in any of the embodiments disclosed above, the active bridge converter dc component suppression method is applied to the local controller of the jth winding converter.
Specifically, the dc component in the ac side current of each winding transformer is different considering the common magnetic circuit coupling of the winding transformers in the active bridge converter. Under the condition that the number of winding transformers is large, the control of all winding converters in different time scales is difficult to complete through the unified controller, so that the embodiment of the invention recommends that different winding converters are controlled by respective local controllers in real time, each winding converter only carries out local control on the direct current component of the current at the self alternating current side, and the data of other winding converters do not need to be sampled and communicated.
Corresponding to the method embodiment, the embodiment of the invention also discloses an active bridge converter, which comprises a main circuit and a control system. The three-phase topological structures of the main circuit are the same, and each phase topological structure comprises: the transformer comprises at least one transformer, at least one primary side winding and at least one secondary side winding, wherein each primary side winding is connected with a DC/AC converter, each secondary side winding is connected with an AC/DC converter, and the DC/AC converter and the AC/DC converter are called winding converters;
the control system is used for acquiring the average value I of the alternating current side current of the jth winding converter in each switching period j J is 1, 2, …, n is the total of winding converters of the three phases of the active bridge converterThe number of the cells; taking 0 as a given value, and comparing the given value with the average value I of the current on the alternating current side of the jth winding converter j Making difference, and outputting the duty ratio compensation quantity delta U of the alternating-current side voltage square wave of the winding converter after the difference value is calculated by the regulator j And the superposed voltage is superposed on the duty ratio of the square wave of the alternating-current side voltage of the winding converter.
Optionally, in any of the active bridge converters disclosed above, when the phase shift angle adjustment in the winding converter and the phase shift angle adjustment between the primary winding converter and the secondary winding converter both use the rising edge of the voltage square wave as the phase shift starting point, the step executed by the control system and superimposed on the duty ratio of the ac side voltage square wave of the winding converter specifically includes:
when Δ U j When the voltage is more than or equal to 0, delaying the falling edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U j When the voltage is less than 0, the falling edge of the square wave of the alternating-current side voltage of the jth winding converter is advanced by a compensation quantity delta U j The time taken;
wherein the falling edge refers to a high-level to zero level falling edge or a high-level to negative level falling edge.
Optionally, in any of the active bridge converters disclosed above, when the phase shift angle adjustment in the winding converter and the phase shift angle adjustment between the primary winding converter and the secondary winding converter all use the falling edge of the voltage square wave as the phase shift starting point, the step of superimposing the falling edge of the voltage square wave on the duty ratio of the ac side voltage square wave of the winding converter executed by the control system specifically includes:
when Δ U is measured j When the voltage is more than or equal to 0, advancing the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U j When the voltage is less than 0, delaying the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation quantity delta U j The time taken;
wherein the rising edge refers to a rising edge from zero level to high level or a rising edge from negative level to high level.
Optionally, in any of the active bridge converters disclosed above, the control system includes a local controller for the jth winding converter.
Optionally, in any of the active bridge converters disclosed above, the regulator is a P or PI regulator.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the active bridge converter embodiment disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points can be referred to the method part for description.
The terms "first," "second," and the like in the description and claims of the present invention and in the preceding drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, identical element in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for suppressing a direct current component of an active bridge converter is characterized in that three-phase topologies of the active bridge converter are the same, and each phase topology comprises the following steps: the transformer comprises at least one transformer, a plurality of primary side windings and a plurality of secondary side windings, wherein each primary side winding is connected into a DC/AC converter, each secondary side winding is connected into an AC/DC converter, and the DC/AC converters and the AC/DC converters are called winding converters;
the method for suppressing the direct-current component of the active bridge converter is applied to a local controller of a jth winding converter, and comprises the following steps:
in each switching period, obtaining the average value I of the current on the alternating current side of the jth winding converter j J is 1, 2, …, n is the total number of winding converters of the three phases of the active bridge converter;
taking 0 as a given value, and comparing the given value with the average value I of the current on the alternating current side of the jth winding converter j Making difference, and outputting the duty ratio compensation quantity delta U of the alternating-current side voltage square wave of the winding converter after the difference value is calculated by the regulator j And the direct current voltage is superposed on the duty ratio of the alternating current side voltage square wave of the winding converter.
2. The method for suppressing a dc component of an active bridge converter according to claim 1, wherein in the active bridge converter, when the phase shift angle adjustment in the winding transformer and the phase shift angle adjustment between the primary winding transformer and the secondary winding transformer are both based on a rising edge of a voltage square wave as a phase shift phase starting point, the method for superimposing the phase shift angle adjustment on a duty cycle of an ac side voltage square wave of the winding transformer comprises:
when Δ U is measured j When the voltage is more than or equal to 0, delaying the falling edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U j When the voltage is less than 0, the falling edge of the square wave of the alternating-current side voltage of the jth winding converter is advanced by a compensation quantity delta U j The time taken;
wherein the falling edge refers to a high-level to zero level falling edge or a high-level to negative level falling edge.
3. The method for suppressing the dc component of the active bridge converter according to claim 1, wherein in the active bridge converter, when the phase shift angle adjustment in the winding transformer and the phase shift angle adjustment between the primary winding transformer and the secondary winding transformer are both started from a falling edge of a voltage square wave as a phase shift phase, the method for superimposing the phase shift angle adjustment on the duty cycle of the ac side voltage square wave of the winding transformer comprises:
when Δ U j When the voltage is more than or equal to 0, advancing the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U is measured j When the voltage is less than 0, delaying the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation quantity delta U j The time taken;
wherein the rising edge refers to a rising edge from zero level to high level or a rising edge from negative level to high level.
4. The active bridge converter direct current component suppression method according to any one of claims 1 to 3, wherein the active bridge converter direct current component suppression method is applied to a local controller of a j-th winding converter.
5. The active bridge converter direct current component suppression method according to claim 1, the regulator being a P or PI regulator.
6. An active bridge converter comprising a main circuit and a control system, wherein the three-phase topologies of the main circuit are the same, and each phase topology thereof comprises: the transformer comprises at least one transformer, a plurality of primary side windings and a plurality of secondary side windings, wherein each primary side winding is connected into a DC/AC converter, each secondary side winding is connected into an AC/DC converter, and the DC/AC converters and the AC/DC converters are called winding converters;
the control system is used for acquiring the average value I of the alternating current side current of the jth winding converter by the local controller of the jth winding converter in each switching period j J is 1, 2, …, n is the total number of winding converters of the three phases of the active bridge converter; taking 0 as a given value, and comparing the given value with the average value I of the current on the alternating current side of the jth winding converter j Making a difference, calculating the difference value through a regulator, and outputting the duty ratio compensation quantity delta U of the alternating-current side voltage square wave of the winding converter j And the direct current voltage is superposed on the duty ratio of the alternating current side voltage square wave of the winding converter.
7. The active bridge converter according to claim 6, wherein when the phase shift angle adjustment in the winding transformer and the phase shift angle adjustment between the primary winding transformer and the secondary winding transformer are both performed with a rising edge of the voltage square wave as a phase shift starting point, the step of superimposing the phase shift starting point on the duty cycle of the ac side voltage square wave of the winding transformer executed by the control system specifically comprises:
when Δ U j When the voltage is more than or equal to 0, delaying the falling edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U j When the voltage is less than 0, the falling edge of the square wave of the alternating-current side voltage of the jth winding converter is advanced by a compensation quantity delta U j The time taken;
wherein the falling edge refers to a high-level to zero level falling edge or a high-level to negative level falling edge.
8. The active bridge converter according to claim 6, wherein when the phase shift angle adjustment in the winding transformer and the phase shift angle adjustment between the primary winding transformer and the secondary winding transformer are both performed with a falling edge of the voltage square wave as a phase shift starting point, the step of superimposing the phase shift angle adjustment on the duty ratio of the ac side voltage square wave of the winding transformer performed by the control system specifically comprises:
when Δ U j When the voltage is more than or equal to 0, advancing the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation amount delta U j The time taken;
when Δ U j When the voltage is less than 0, delaying the rising edge of the square wave of the alternating-current side voltage of the jth winding converter by a compensation quantity delta U j The time taken;
wherein the rising edge refers to a rising edge from a zero level to a high level or a rising edge from a negative level to a high level.
9. An active bridge converter according to any of claims 6 to 8, wherein the control system comprises a local controller for the jth winding converter; the local controller of the jth winding converter is used for independent control of the present winding converter.
10. The active bridge converter according to claim 6, wherein the regulator is a P or PI regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011492144.5A CN112491273B (en) | 2020-12-16 | 2020-12-16 | Active bridge converter and direct current component suppression method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011492144.5A CN112491273B (en) | 2020-12-16 | 2020-12-16 | Active bridge converter and direct current component suppression method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112491273A CN112491273A (en) | 2021-03-12 |
| CN112491273B true CN112491273B (en) | 2022-09-13 |
Family
ID=74916493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011492144.5A Active CN112491273B (en) | 2020-12-16 | 2020-12-16 | Active bridge converter and direct current component suppression method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112491273B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI221354B (en) * | 2003-08-11 | 2004-09-21 | Delta Electronics Inc | Method and controller for depressing DC magnetic declination of transformer |
| CN109391155A (en) * | 2018-12-06 | 2019-02-26 | 国网江苏省电力有限公司连云港供电分公司 | A kind of D.C. magnetic biasing suppressing method for two-way full-bridge DC/DC converter |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051172A (en) * | 2012-12-19 | 2013-04-17 | 扬州森源电气有限公司 | Magnetic bias suppression system and method of phase-shifted full bridge converter for photovoltaic power generation |
| CN104158405A (en) * | 2014-08-25 | 2014-11-19 | 东南大学 | Two-way DC/DC converter for micro-grid and magnetic bias digital suppression method |
| CN104467434B (en) * | 2014-11-21 | 2017-01-04 | 深圳供电局有限公司 | Transient phase-shifting control method for double-active full-bridge direct current converter |
| CN109450255A (en) * | 2018-11-26 | 2019-03-08 | 合肥科威尔电源系统有限公司 | A kind of two-way full-bridge DC/DC converter circuit and the control method for inhibiting bias |
| CN110829845A (en) * | 2019-09-27 | 2020-02-21 | 西安交通大学 | Power electronic transformer topology with power self-balancing capability and control method thereof |
| CN111525811B (en) * | 2020-05-07 | 2021-09-14 | 爱士惟新能源技术(江苏)有限公司 | Magnetic balance control method of double-active full-bridge bidirectional DC/DC converter |
| CN111682787A (en) * | 2020-05-18 | 2020-09-18 | 天津大学 | Single-stage three-phase AC/DC converter based on isolation converter module and method |
-
2020
- 2020-12-16 CN CN202011492144.5A patent/CN112491273B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI221354B (en) * | 2003-08-11 | 2004-09-21 | Delta Electronics Inc | Method and controller for depressing DC magnetic declination of transformer |
| CN109391155A (en) * | 2018-12-06 | 2019-02-26 | 国网江苏省电力有限公司连云港供电分公司 | A kind of D.C. magnetic biasing suppressing method for two-way full-bridge DC/DC converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112491273A (en) | 2021-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11356015B2 (en) | Modular medium voltage fast chargers | |
| JP5826780B2 (en) | Power conversion circuit system | |
| US10224826B2 (en) | Control apparatus determining transformer magnetization in a DC/DC converter based on difference between primary and secondary currents | |
| KR101208252B1 (en) | Apparatus and method of generating current command for tracking maximum power point in solar enery generating system | |
| JP2004528000A (en) | Power supply system | |
| CN107769247B (en) | RLC load simulation system for anti-islanding detection and control method thereof | |
| US20160118904A1 (en) | Power conversion apparatus | |
| US11245254B2 (en) | Method for phase controlled energizing of power transformer | |
| Deng et al. | Decoupling control strategy for input-series output-parallel systems based on dual active bridge dc-dc converters | |
| Liu et al. | Design consideration of converter based transmission line emulation | |
| Jang et al. | Input-voltage balancing of series-connected converters | |
| CN112491273B (en) | Active bridge converter and direct current component suppression method thereof | |
| JP2016171662A (en) | Isolated operation detector, power conversion system, and isolated operation detection method | |
| JP2008125169A (en) | Power transformer for system coordination | |
| Liao | Impedance decomposition for design-oriented analysis of grid-forming voltage-source converters | |
| JP7298448B2 (en) | Isolated DC/DC converter | |
| CN112202340B (en) | Cascaded power electronic transformer and control method thereof | |
| WO2016132471A1 (en) | Power conversion device and initial charging method therefor | |
| Pugliese et al. | High-frequency harmonic current control of power converters | |
| TWI579676B (en) | Dynamic voltage restorer | |
| Carstensen et al. | Novel 3 level bidirectional buck converter with wide operating range for hardware-in-the-loop test systems | |
| WO2019213673A1 (en) | Buck matrix-type rectifier with boost switch, and operation thereof during one-phase loss | |
| Tajfar et al. | Control of high-frequency-link inverter using optimal switching sequence | |
| Baazoug et al. | Design of an adaptive feed-forward control scheme for the DC bus voltage control of single phase grid connected converters | |
| US8908398B2 (en) | Method for operating a converter circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |