CN212811585U - Energy bidirectional flow type AC-DC converter - Google Patents
Energy bidirectional flow type AC-DC converter Download PDFInfo
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- CN212811585U CN212811585U CN202021524780.7U CN202021524780U CN212811585U CN 212811585 U CN212811585 U CN 212811585U CN 202021524780 U CN202021524780 U CN 202021524780U CN 212811585 U CN212811585 U CN 212811585U
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Abstract
The embodiment of the utility model discloses energy bidirectional flow type AC-DC converter, including three-phaseLCFilter, isolation transformer, first group of three-phase full-bridge converters, second group of three-phase full-bridge converters and first direct current side capacitorC 1A second DC side capacitorC 2Two groups of secondary windings of the isolation transformer are respectively connected with the first group of three-phase full-bridge converters and the second group of three-phase full-bridge converters; the first and second three-phase full-bridge converters are connected in series withC 1、C 2Are connected in parallel;C 1one end of the three-phase inverter is connected in parallel with the output end of the first group of three-phase full-bridge inverters,C 1the other end of (1) andC 2one end of the first and second electrodes are connected in series,C 2and the other end of the three-phase full-bridge converter is connected in parallel with the output end of the second group of three-phase full-bridge converters. The utility model discloses a control the on-state of two sets of three-phase full-bridge converter switch tubes, after the wave filter filtration, output voltage's THD value is less than 4% to can improve contravariant output voltage/current quality by a wide margin. The utility model is suitable for a high-power electric energy transform occasion.
Description
Technical Field
The utility model relates to a power electronics technical field especially relates to an energy bidirectional flow type AC-DC converter.
Background
The multi-pulse rectifier has the advantages of simple structure and high reliability, and is widely applied to high-power rectifiers, but the three-phase rectifier bridge of the traditional 12-pulse rectifier adopts a diode device for rectification, so that the energy flow direction is single, the energy can only flow from the alternating current side to the direct current side, the harmonic suppression capability of the traditional 12-pulse rectifier is limited, the input voltage/current contains 12k +/-1 harmonics, and the THD value is more than 5%.
SUMMERY OF THE UTILITY MODEL
An embodiment of the present invention provides an energy bidirectional flow type AC-DC converter to enrich the function of the multi-pulse rectifier and improve the quality of the input voltage/current.
In order to solve the above technical problem, an embodiment of the present invention provides an energy bidirectional flow type AC-DC converter, including a three-phase AC-DC converterLCFilter, isolation transformer, first group of three-phase full-bridge converters, second group of three-phase full-bridge converters and first direct current side capacitorC 1A second DC side capacitorC 2The primary winding of the isolation transformer passes through three phasesLCThe filter is connected with a three-phase voltage source or a three-phase load in series, and two groups of secondary windings of the isolation transformer are respectively connected with the left end of the first group of three-phase full-bridge converters and the left end of the second group of three-phase full-bridge converters; the first three-phase full-bridge converter group is connected with the second three-phase full-bridge converter group in series and is connected with the first direct current side capacitorC 1A second DC side capacitorC 2Are connected in parallel; first direct current capacitorC 1Is connected in parallel with the output end of the first group of three-phase full-bridge converters, and a first direct current capacitorC 1The other end of the first capacitor and a second DC capacitorC 2One end of the first and second electrodes are connected in series,second DC capacitorC 2And the other end of the three-phase full-bridge converter is connected in parallel with the output end of the second group of three-phase full-bridge converters.
Further, three phasesLCThe filter comprises three inductors with equal inductance values, and an alternating current capacitor with equal capacitance value is respectively connected in parallel in front of the three inductors.
Furthermore, the first group of three-phase full-bridge converters and the second group of three-phase full-bridge converters are respectively composed of 6 IGBTs with anti-parallel diodes, when the converters work in a rectification mode, the IGBTs are in a turn-off state, and the anti-parallel diodes are utilized for rectification; when the converter works in an inversion mode, two groups of three-phase full-bridge converters are controlled by adopting phase shift.
Further, in the inverter mode, each IGBT of the two groups of three-phase full-bridge converters adopts a 150-degree conduction mode, wherein conduction phases of two upper IGBTs and two lower IGBTs of the same bridge arm of each group of three-phase full-bridge converters are different by 180 degrees, conduction phases of the IGBTs of 3 bridge arms in the abc three phases are different by 120 degrees, and conduction phases of the IGBTs of the second group of three-phase full-bridge converters respectively lag behind 30 degrees of the IGBTs of the first group of three-phase full-bridge converters.
Further, a first DC side capacitorC 1And a second DC side capacitorC 2Is a large capacitor with equal capacitance, wherein, the capacitor is arranged on the first direct current sideC 1And a second DC side capacitorC 2An interface P is led out from the connection part to form a direct current interface with two voltage levelsu 1Andu 2，u 1andu 2satisfy the requirement ofu 2=2u 1。
The utility model has the advantages that: the utility model discloses on the basis of traditional 12 pulse wave rectifiers of tandem type, an energy bidirectional flow type AC-DC converter is proposed, wherein, for rectification mode, energy reverse flow when energy forward flow for contravariant mode, through the on-state of controlling two sets of three-phase full-bridge converter switch tubes, the alternating current of the outputable 12 notch cuttlefishes of phase-shifting transformer, through the process of controllingLCAfter the filtering of the filter, the THD value of the output voltage is less than 4 percent, thereby greatly improving the inversion output voltage-The quality of the current. The method has strong portability, and can also be used in a parallel 12-pulse rectifier or other rectifiers with pulse wave numbers.
Drawings
Fig. 1 is a circuit configuration diagram of an energy bidirectional flow AC-DC converter according to an embodiment of the present invention.
Fig. 2 is a circuit configuration diagram of the rectifying operation mode of the energy bidirectional flow type AC-DC converter according to the embodiment of the present invention.
Fig. 3 is a circuit configuration diagram of an inverter operation mode of the energy bidirectional flow AC-DC converter according to the embodiment of the present invention.
Fig. 4 is a sequence diagram of the turn-on of the IGBTs in the two sets of three-phase full-bridge converters in the energy bidirectional flow type AC-DC converter re-phase shift control according to the embodiment of the present invention.
Description of the reference numerals
In the context of figures 1 to 4 of the drawings,u a、u b、u cthe rectification mode is three-phase AC input voltage, the inversion mode is three-phase AC output voltage,L a、L b、L cis three phasesLCThe filter inductance of the filter is set to be,C a、C b、C cis three phasesLCThe filter capacitance of the filter is set to be,N 1is the primary winding turn number of the isolated phase-shifting transformer, N is the neutral point of the star-shaped connection winding,N 2the number of turns of a first secondary winding of the isolated phase-shifting transformer,N 3the number of turns of a second secondary winding of the isolated phase-shifting transformer is S11、S13、S15、S14、S16、S126 IGBTs, D, for a first set of three-phase full-bridge converters11、D13、D15、D14、D16、D12Antiparallel diodes, S, of 6 IGBTs of a first three-phase full-bridge converter group21、S23、S25、S24、S26、S226 IGBTs, D, for a second set of three-phase full-bridge converters21、D23、D25、D24、D26、D22The anti-parallel diodes of the second group of three-phase full-bridge converter 6 IGBTs,C 1is a first direct current side capacitance and is,C 2is a second direct-current side capacitor and is provided with a first direct-current side capacitor,u 1is the voltage of the low-voltage interface at the direct-current side,u 2is the voltage of a high voltage interface at the direct current side, P is a voltage midpoint interface at the direct current side,E a、E b、E cis a three-phase alternating-current voltage source,R a、R b、R cis a three-phase alternating current load;
1 is three-phaseLCA filter, 2 an isolation transformer, 3 a first three-phase full-bridge converter, 4 a second three-phase full-bridge converter, and 5 a first DC-side capacitorC 1And 6 is a second DC side capacitorC 2。
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The first embodiment is as follows: as shown in fig. 1, the utility model provides an energy bidirectional flow type AC-DC converter includes three-phase LC wave filter 1, isolation transformer 2, first three-phase full-bridge converter 3 of group, second three-phase full-bridge converter 4 of group, first direct current side electric capacityC 15. Second DC side capacitorC 26. The left end of the three-phase LC filter 1 is connected with a three-phase voltage source or a three-phase load in series, and the right end of the three-phase LC filter 1 is connected with a primary winding of the isolation transformer 2 in series; two groups of secondary windings of the isolation transformer 2 are respectively connected with the left end of the first group of three-phase full-bridge converters 3 and the left end of the second group of three-phase full-bridge converters 4; the first three-phase full-bridge converter 3 and the second three-phase full-bridge converter 4 are connected in series and connected with the first DC side capacitorC 15. Second DC side capacitorC 26 are connected in parallel; first direct current capacitorC 15 is connected with the upper end of the first group of three-phase full-bridge converters 3 in parallel, and a first direct current capacitorC 15 and a second DC capacitorC 26 are connected in series at the upper end, and a second direct current capacitorC 2The lower end of the second group of three-phase full-bridge converters 4 is connected with the lower end of the first group of three-phase full-bridge converters 6 in parallel.
In one embodiment, the three-phase LC filter 1 is configured such that the three inductors are large inductors having the same inductance value, and the front-end voltage source can be equivalent to a current source, and therefore, the three-phase LC filter 1 can be configured by connecting an ac capacitor in parallel to each of the three inductors.
Example two: as shown in fig. 1, the isolation transformer 2 of the energy bidirectional current AC-DC converter according to the embodiment of the present invention is an isolated phase-shifting transformer, the primary winding of the isolated phase-shifting transformer is connected in a star shape, the first secondary winding is connected in a star shape, the second secondary winding is connected in a triangle shape, two sets of three-phase voltages with equal output values and a phase difference of 30 ° are output, and the transformation ratio of the primary and secondary windings satisfies the requirement of the isolated phase-shifting transformerN 1：N 2：N 3= k:1: 
。
When the energy of the energy bidirectional flow type AC-DC converter of the utility model flows in the forward direction, the converter works in a rectification mode; when energy flows reversely, the energy storage type inverter works in an inversion mode, and the two working modes of rectification and inversion can be seamlessly switched. The cut-off frequency of the three-phase LC filter 1 can meet the requirements in both a rectification working mode and an inversion working mode.
Example three: as shown in FIG. 2, the utility model discloses an energy bidirectional flow type AC-DC converter, when the converter work is in rectification mode, three-phase LC wave filter 1's left end and three-phase voltage source series connection, the IGBT (Insulated Gate Bipolar Transistor) of first three-phase full-bridge converter 3 of group and the three-phase full-bridge converter 4 of second group is in the off-state, three-phase voltage source is equivalent to the current source after flowing through three-phase LC wave filter 1, send into in the isolated form phase shifter, thereby output two sets of equal phase difference 30's of size voltage, send into respectively in first three-phase full-bridge converter 3 of group and the three-phase full-bridge converter 4 of second group, utilize the anti-parallel diode of two sets of three-phase full-bridge converters to rectify, the voltage after the rectification is at first direct current side electric capacityC 15 and a second DC-side capacitorC 26 will output DC of two voltage levels under the action ofu 1Andu 2and satisfyu 2=2u 1Due to the effect of the front-end three-phase LC filter 1, the THD value of the input current and the input voltage will be reduced to below 5%.
Preferably, the first group of three-phase full-bridge converters 3 and the second group of three-phase full-bridge converters 4 are respectively composed of 6 IGBTs with anti-parallel diodes, when the converters work in a rectification mode, the IGBTs are in an off state, and rectification is performed by the anti-parallel diodes; when the converter works in an inversion mode, two groups of three-phase full-bridge converters are controlled by adopting phase shift. The utility model adopts IGBT to improve the power transmission grade of the converter and realize the function of energy bidirectional flow; compared with an MOSFET, the IGBT can bear larger voltage stress and current stress, and the converter can be suitable for both medium and small power occasions and high power occasions by adopting the IGBT.
When the energy bidirectional flow type AC-DC converter of the utility model is in an inversion mode, each IGBT of the two groups of three-phase full-bridge converters adopts a 150-degree conduction mode, thereby improving the utilization rate of direct current voltage; the conducting phases of the upper IGBT and the lower IGBT of the same bridge arm of each group of three-phase full-bridge converters are 180 degrees apart, and the conducting phases of the IGBTs of 3 bridge arms in three-phase abc are 120 degrees apartIGBT (S) in the second three-phase full-bridge inverter 411、S13、S15、S14、S16、S12) The conducting phases respectively lag behind the IGBTs (S) in the first group of three-phase full-bridge inverters 321、S23、S25、S24、S26、S22)30 deg. In one embodiment, the phase difference between the two sets of full bridges has other conducting modes, such as 120o180 degrees (not including 120 degrees and 180 degrees), but when a 150-degree conduction mode is adopted, the input current of a rectification mode and the output voltage THD of an inversion mode are the minimum, and the electric energy quality is the best.
The utility model discloses a rectifier bridge that IGBT constitutes plays the energy both-way flow effect to the direction and the electric energy quality that the energy flows are all controllable, solve the single and limited problem of harmonic suppression ability of many pulse wave rectifier energy flow direction.
Example four: as shown in fig. 3 and 4, when the inverter operates in the inverter mode, the left end of the three-phase LC filter 1 is connected in series with the three-phase load, the first three-phase full-bridge inverter 3 and the second three-phase full-bridge inverter 4 adopt phase shift control, and when the dc power flows through the two three-phase full-bridge inverters, the turn-on sequence of the IGBTs is S in one cycle11 S15 S16 S25S26 S22、S11 S16 S21 S25 S26 S22、S11 S16 S12 S21 S26 S22、S11 S12 S21 S26 S22、S11 S13 S12 S21S22、S13 S12 S21 S23、S13 S14 S12 S23、S13 S14 S23 S24、S13 S15 S14 S23 S24、S15 S14 S23 S25 S24、S15 S14 S16 S25 S24、S15 S16 S25 S24 S26Therefore, two groups of six-step wave voltages with the phase difference of 30 degrees are output and sent into the phase-shifting transformer, the phase-shifting transformer outputs twelve-step wave voltages, and three-phase alternating currents with THD (total harmonic distortion) values smaller than 4% are output under the action of the three-phase LC filter 1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. An energy bidirectional flow type AC-DC converter is characterized by comprising three phasesLCFilter, isolation transformer, first group of three-phase full-bridge converters, second group of three-phase full-bridge converters and first direct current side capacitorC 1A second DC side capacitorC 2The primary winding of the isolation transformer passes through three phasesLCThe filter is connected with a three-phase voltage source or a three-phase load in series, and two groups of secondary windings of the isolation transformer are respectively connected with the left end of the first group of three-phase full-bridge converters and the left end of the second group of three-phase full-bridge converters; the first three-phase full-bridge converter group is connected with the second three-phase full-bridge converter group in series and is connected with the first direct current side capacitorC 1A second DC side capacitorC 2Are connected in parallel; first direct current capacitorC 1Is connected in parallel with the output end of the first group of three-phase full-bridge converters, and a first direct current capacitorC 1The other end of the first capacitor and a second DC capacitorC 2One end of the first DC capacitor is connected in series, and the second DC capacitorC 2And the other end of the three-phase full-bridge converter is connected in parallel with the output end of the second group of three-phase full-bridge converters.
2. The energy bidirectional flow AC-DC converter of claim 1, wherein three phases are providedLCThe filter comprises three inductors with equal inductance valuesThe front parts are respectively connected with an alternating current capacitor with the same capacitance value in parallel.
3. The energy bidirectional flow type AC-DC converter according to claim 1, wherein the first group of three-phase full-bridge converters and the second group of three-phase full-bridge converters are respectively composed of 6 IGBTs with anti-parallel diodes, and when the converter operates in the rectifying mode, the IGBTs are in an off state and are rectified by the anti-parallel diodes; when the converter works in an inversion mode, two groups of three-phase full-bridge converters are controlled by adopting phase shift.
4. The energy bidirectional flow type AC-DC converter according to claim 3, wherein, in the inverter mode, each IGBT of the two groups of three-phase full-bridge converters adopts a 150 ° conduction mode, wherein the conduction phases of the upper and lower two IGBTs of the same bridge arm of each group of three-phase full-bridge converters are different by 180 °, the conduction phases of the IGBTs of the 3 bridge arms of the abc three-phase full-bridge converter are different by 120 °, and the conduction phases of the IGBTs of the second group of three-phase full-bridge converters are respectively delayed from the conduction phases of the IGBTs 30 ° of the.
5. The energy bidirectional flow AC-DC converter of claim 3, wherein the first DC-side capacitorC 1And a second DC side capacitorC 2Is a large capacitor with equal capacitance, wherein, the capacitor is arranged on the first direct current sideC 1And a second DC side capacitorC 2An interface P is led out from the connection part to form a direct current interface with two voltage levelsu 1Andu 2，u 1andu 2satisfy the requirement ofu 2=2u 1。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021524780.7U CN212811585U (en) | 2020-07-27 | 2020-07-27 | Energy bidirectional flow type AC-DC converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021524780.7U CN212811585U (en) | 2020-07-27 | 2020-07-27 | Energy bidirectional flow type AC-DC converter |
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| CN212811585U true CN212811585U (en) | 2021-03-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300619A (en) * | 2021-05-31 | 2021-08-24 | 哈尔滨工程大学 | Series 24-pulse rectifier with auxiliary passive pulse multiplying circuit |
| CN116742975A (en) * | 2023-05-25 | 2023-09-12 | 内蒙古工业大学 | Injection type multi-level voltage type converter based on MMC half-bridge module |
-
2020
- 2020-07-27 CN CN202021524780.7U patent/CN212811585U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300619A (en) * | 2021-05-31 | 2021-08-24 | 哈尔滨工程大学 | Series 24-pulse rectifier with auxiliary passive pulse multiplying circuit |
| CN116742975A (en) * | 2023-05-25 | 2023-09-12 | 内蒙古工业大学 | Injection type multi-level voltage type converter based on MMC half-bridge module |
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