CN214205360U - Novel three-level Delta-type connection rectifier - Google Patents
Novel three-level Delta-type connection rectifier Download PDFInfo
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- CN214205360U CN214205360U CN202023035173.7U CN202023035173U CN214205360U CN 214205360 U CN214205360 U CN 214205360U CN 202023035173 U CN202023035173 U CN 202023035173U CN 214205360 U CN214205360 U CN 214205360U
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Abstract
A novel three-level Delta-type connection rectifier comprises a three-phase alternating-current power supply, a filter circuit, a Delta-type connection rectifying circuit and a three-level circuit. The rectifier has a delta connection on the ac input side, and its dc link current can be shared by multiple devices at a given time to reduce conduction losses. In recent years, multi-level power converters have been receiving much attention due to their high power and high voltage characteristics. Compared with the traditional three-level rectifier circuit structure, the novel three-level Delta-type connection rectifier reduces the use of switching devices and eliminates reverse recovery loss.
Description
Technical Field
The utility model relates to a three-phase electric energy transform field, concretely relates to novel three level Delta type connects method rectifier.
Background
The three-phase Current Source Rectifier (CSR) has a step-down AC/DC voltage conversion function, and compared with a conventional two-stage voltage source rectifier, the AC filter is smaller in size and has surge current limiting capability. However, in most pulse width modulated current source applications, the switch is typically formed by connecting an active device (IGBT, mosfet or JFET) in series with a diode. Even with several devices in parallel in one switch, the high conduction loss still accounts for 50% of the total converter loss in conventional CSRs. The large conduction losses and the corresponding heat sink size are the main disadvantages of current source converters compared to voltage source converters. In addition, the conventional multi-level power rectifier has the advantages of high power and high voltage, but the structure also has the defect of complex realization due to the requirement of a large number of power devices and control circuits.
Disclosure of Invention
In view of this, the present invention provides a novel three-level Delta-type rectifier, which reduces the conduction loss of the device, improves the power factor of the power supply, and has no surge current.
The utility model discloses the technical scheme who takes does:
a novel three-level Delta-type connection rectifier comprises a three-phase alternating-current input power supply Uin, a filter circuit, a Delta-type connection rectifying circuit and a three-level circuit; the three-phase alternating current input power Uin is connected with the filter circuit; the filter circuit is connected with the three-level circuit; the filter circuit is connected with the rectifying circuit in a Delta type connection method; the rectifying circuit is connected with the three-level circuit. The three-phase alternating current power supply comprises an a-phase power supply, a b-phase power supply and a c-phase power supply; the filter circuit comprises a filter inductor L1, a filter capacitor C1, a filter inductor L2, a filter capacitor C2, a filter inductor L3 and a filter capacitor C3; the rectification circuit comprises a diode D1aDiode D1bDiode D2aDiode D2cDiode D3bDiode D3cDiode D4aDiode D4bDiode D5aDiode D5cDiode D6bDiode D6cA switch S1, a switch S2, a switch S3, a switch S4, a switch S5, a switch S6, an inductor L4, an inductor L5 and a capacitor C6, wherein the three-level circuit comprises a diode D1Diode D2Diode D3Diode D4Diode D5Switch S7, switch S8, switch S9, switch S10, capacitor C4, and capacitor C5.
The three-phase alternating current power supply is a symmetrical three-phase current source, wherein the angle of the phase a power supply is advanced by 120 degrees compared with that of the phase b power supply, and the angle of the phase b power supply is advanced by 120 degrees compared with that of the phase c power supply.
One end of a filter inductor L1 in the filter circuit is connected with the phase a power supply, and the other end of the filter inductor L1 is connected with one end of a filter capacitor C1; one end of a filter inductor L2 is connected with a b-phase power supply, and the other end of the filter inductor L2 is connected with one end of a capacitor filter C2; one end of a filter inductor L3 is connected with the C-phase power supply, the other end of the filter inductor L3 is connected with one end of a filter capacitor C3, and the other ends of the filter capacitor C1, the filter capacitor C2 and the filter capacitor C3 are connected.
In the Delta type connection rectification circuit, a diode D1aCathode and diode D1bIs connected to the collector of the switching tube S1, and a diode D1a With a phase power supply and D4aIs connected to the cathode, D4aAnd D4bIs connected to the emitter of a switching tube S4, D4bAnd D1bThe anode of the anode is connected with a b-phase power supply; diode D3bCathode and diode D3cIs connected to the collector of the switching tube S3, and a diode D3b With b-phase power supply and D6bIs connected to the cathode, D6bAnd D6cIs connected to the emitter of a switching tube S6, D6cAnd D3cThe anode of the anode is connected with a c-phase power supply; diode D5aCathode and diode D5cIs connected to the collector of the switching tube S5, and a diode D5c With a c-phase power supply and D2cIs connected to the cathode, D2aAnd D2cIs connected to the emitter of a switching tube S2, D2aAnd D5aThe anode of the anode is connected with an a-phase power supply; the switch S1, the switch S3, the switch S5 and one end of the inductor L4 are connected; the switch S4, the switch S6, the switch S2 and one end of the inductor L5 are connected; the other ends of the inductor L4 and the inductor L5 are connected to both ends of the capacitor C6, respectively.
In the three-level circuit, a diode D3、D4、D5、D6Respectively connected to the collectors of switching tubes S7, S8, S9, S10, and a diode D3、D4、D5、D6Respectively connected with the emitters of switching tubes S7, S8, S9 and S10, the collector of S7 is connected with one end of L4 and C4, the emitter of S10 is connected with one end of L5 and C5, the emitter of S7 is connected with the collector of S8 and D1Is connected with the collector of S8, the collector of S9, and is connected with one end of the filter capacitor C1, the filter capacitor C2 and the filter capacitor C3, the emitter of S9 is connected with the collector of S10, D2Are connected to the anode D1And D2Is connected to an isoelectric point, and C4 is connected to C5, also connected to an isoelectric point.
Compared with the prior art, the utility model has the following advantages: the input terminals of the rectifier are connected in a triangular shape, and the current of a direct current link can be shared by more switches so as to reduce conduction loss. The three-level part uses fewer power devices, saves the use cost, and has no surge current, reverse recovery of a diode and conduction loss.
Drawings
FIG. 1 is a circuit diagram of an embodiment of the present invention;
FIG. 2 is a three-level circuit configuration used by the present invention;
fig. 3 is a modulation signal of a switching tube of a rectifier used in the present invention;
fig. 4 is an equivalent circuit of the present invention operating in sector 12;
Detailed Description
Fig. 1 shows a novel three-level Delta-type connection rectifier, which comprises a three-phase alternating-current input power source Uin, a filter circuit, a Delta-type connection rectifying circuit and a three-level circuit; the three-phase alternating current input power Uin is connected with the filter circuit; the filter circuit is connected with the three-level circuit; the filter circuit is connected with the rectifying circuit in a Delta type connection method; the rectifying circuit is connected with the three-level circuit. The three-phase alternating current power supply comprises an a-phase power supply, a b-phase power supply and a c-phase power supply; the filter circuit comprises a filter inductor L1 for filteringThe filter circuit comprises a capacitor C1, a filter inductor L2, a filter capacitor C2, a filter inductor L3 and a filter capacitor C3; the rectification circuit comprises a diode D1aDiode D1bDiode D2aDiode D2cDiode D3bDiode D3cDiode D4aDiode D4bDiode D5aDiode D5cDiode D6bDiode D6cA switch S1, a switch S2, a switch S3, a switch S4, a switch S5, a switch S6, an inductor L4, an inductor L5 and a capacitor C6, wherein the three-level circuit comprises a diode D1Diode D2Diode D3Diode D4Diode D5Switch S7, switch S8, switch S9, switch S10, capacitor C4, and capacitor C5.
The three-phase alternating current power supply is a symmetrical three-phase current source, wherein the angle of the phase a power supply is advanced by 120 degrees compared with that of the phase b power supply, and the angle of the phase b power supply is advanced by 120 degrees compared with that of the phase c power supply.
One end of a filter inductor L1 in the filter circuit is connected with the phase a power supply, and the other end of the filter inductor L1 is connected with one end of a filter capacitor C1; one end of a filter inductor L2 is connected with a b-phase power supply, and the other end of the filter inductor L2 is connected with one end of a capacitor filter C2; one end of a filter inductor L3 is connected with the C-phase power supply, the other end of the filter inductor L3 is connected with one end of a filter capacitor C3, and the other ends of the filter capacitor C1, the filter capacitor C2 and the filter capacitor C3 are connected.
In the Delta type connection rectification circuit, a diode D1aCathode and diode D1bIs connected to the collector of the switching tube S1, and a diode D1a With a phase power supply and D4aIs connected to the cathode, D4aAnd D4bIs connected to the emitter of a switching tube S4, D4bAnd D1bThe anode of the anode is connected with a b-phase power supply; diode D3bCathode and diode D3cIs connected to the collector of the switching tube S3, and a diode D3b With b-phase power supply and D6bIs connected to the cathode, D6bAnd D6cIs connected to the emitter of a switching tube S6, D6cAnd D3cThe anode of the anode is connected with a c-phase power supply; IIPolar tube D5aCathode and diode D5cIs connected to the collector of the switching tube S5, and a diode D5c With a c-phase power supply and D2cIs connected to the cathode, D2aAnd D2cIs connected to the emitter of a switching tube S2, D2aAnd D5aThe anode of the anode is connected with an a-phase power supply; the switch S1, the switch S3, the switch S5 and one end of the inductor L4 are connected; the switch S4, the switch S6, the switch S2 and one end of the inductor L5 are connected; the other ends of the inductor L4 and the inductor L5 are connected to both ends of the capacitor C6, respectively.
In the three-level circuit, a diode D3、D4、D5、D6Respectively connected to the collectors of switching tubes S7, S8, S9, S10, and a diode D3、D4、D5、D6Respectively connected with the emitters of switching tubes S7, S8, S9 and S10, the collector of S7 is connected with one end of L4 and C4, the emitter of S10 is connected with one end of L5 and C5, the emitter of S7 is connected with the collector of S8 and D1Is connected with the collector of S8, the collector of S9, and is connected with one end of the filter capacitor C1, the filter capacitor C2 and the filter capacitor C3, the emitter of S9 is connected with the collector of S10, D2Are connected to the anode D1And D2Is connected to an isoelectric point, and C4 is connected to C5, also connected to an isoelectric point.
Fig. 2 shows a three-level circuit structure used in the present invention. When S7,8,9,10= {1100}, V10=VO2; when S7,8,9,10= {0110}, V10= 0; when S7,8,9,10= {0011}, V10 = -VO/2。
Fig. 3 shows a modulation signal of a switching tube of a rectifier used in the present invention, which is divided into 12 CSR sectors per line period according to an input voltage and an input current.
Fig. 4 is an equivalent circuit diagram of the present invention operating in sector 12, where V is shown in fig. 4a > V c ≥ V bThe diode bridge in each branch will charge the higher phase according to the input ac voltageThe voltage is clamped to the common cathode of the two higher diodes while the lower phase voltage is clamped to the common anode of the two lower diodes. S1 and S5 are both turned on to share the current of the a-phase, and S4 and S6 are both turned on to share the current of the b-phase. Due to Va> V bDiode D1bIs blocked, D1aOn, and likewise D in the sector4aClosing, D4bAnd conducting. In the three-level structure, S7,8,9,10 is switched from {0110} to {0011}, the current path of phase a is changed to C1-C2-S1,5-S1,5-C4-C5, S3 and S4 are turned on to allow the phase b current to flow from the capacitor C2 through S4 and S6, energy is stored in the inductor L2, and the current of phase a and phase C is attenuated due to the slope of the current applied to the inductor
The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the scope of the present invention should belong to the coverage of the present invention.
Claims (5)
1. A novel three-level Delta type connection rectifier is characterized in that: the three-phase alternating current power supply comprises a three-phase alternating current input power supply Uin, a filter circuit, a Delta type connection rectification circuit and a three-level circuit; the three-phase alternating current input power Uin is connected with the filter circuit; the filter circuit is connected with the three-level circuit; the filter circuit is connected with the rectifying circuit in a Delta type connection method; the rectifying circuit is connected with the three-level circuit; the three-phase alternating current power supply comprises an a-phase power supply, a b-phase power supply and a c-phase power supply; the filter circuit comprises a filter inductor L1, a filter capacitor C1, a filter inductor L2, a filter capacitor C2, a filter inductor L3 and a filter capacitor C3; the rectification circuit comprises a diode D1aDiode D1bDiode D2aDiode D2cDiode D3bDiode D3cDiode D4aDiode D4bDiode D5aDiode D5cDiode D6bDiode D6cAnd openerA switch S1, a switch S2, a switch S3, a switch S4, a switch S5, a switch S6, an inductor L4, an inductor L5 and a capacitor C6, wherein the three-level circuit comprises a diode D1Diode D2Diode D3Diode D4Diode D5Switch S7, switch S8, switch S9, switch S10, capacitor C4, and capacitor C5.
2. The novel three-level Delta-type connection rectifier as claimed in claim 1, wherein: the three-phase alternating current power supply is a symmetrical three-phase current source, wherein the angle of the phase a power supply is advanced by 120 degrees compared with that of the phase b power supply, and the angle of the phase b power supply is advanced by 120 degrees compared with that of the phase c power supply.
3. The novel three-level Delta-type connection rectifier as claimed in claim 1, wherein: one end of a filter inductor L1 in the filter circuit is connected with the phase a power supply, and the other end of the filter inductor L1 is connected with one end of a filter capacitor C1; one end of a filter inductor L2 is connected with a b-phase power supply, and the other end of the filter inductor L2 is connected with one end of a capacitor filter C2; one end of a filter inductor L3 is connected with the C-phase power supply, the other end of the filter inductor L3 is connected with one end of a filter capacitor C3, and the other ends of the filter capacitor C1, the filter capacitor C2 and the filter capacitor C3 are connected.
4. The novel three-level Delta-type connection rectifier as claimed in claim 1, wherein: in the Delta type connection rectification circuit, a diode D1aCathode and diode D1bIs connected to the collector of the switching tube S1, and a diode D1a With a phase power supply and D4aIs connected to the cathode, D4aAnd D4bIs connected to the emitter of a switching tube S4, D4bAnd D1bThe anode of the anode is connected with a b-phase power supply; diode D3bCathode and diode D3cIs connected to the collector of the switching tube S3, and a diode D3b With b-phase power supply and D6bIs connected to the cathode, D6bAnd D6cIs connected to the emitter of a switching tube S6, D6cAnd D3cThe anode of the anode is connected with a c-phase power supply; dipolar bodyPipe D5aCathode and diode D5cIs connected to the collector of the switching tube S5, and a diode D5c With a c-phase power supply and D2cIs connected to the cathode, D2aAnd D2cIs connected to the emitter of a switching tube S2, D2aAnd D5aThe anode of the anode is connected with an a-phase power supply; the switch S1, the switch S3, the switch S5 and one end of the inductor L4 are connected; the switch S4, the switch S6, the switch S2 and one end of the inductor L5 are connected; the other ends of the inductor L4 and the inductor L5 are connected to both ends of the capacitor C6, respectively.
5. The novel three-level Delta-type connection rectifier as claimed in claim 1, wherein: in the three-level circuit, a diode D3、D4、D5、D6Respectively connected to the collectors of switching tubes S7, S8, S9, S10, and a diode D3、D4、D5、D6Respectively connected with the emitters of switching tubes S7, S8, S9 and S10, the collector of S7 is connected with one end of L4 and C4, the emitter of S10 is connected with one end of L5 and C5, the emitter of S7 is connected with the collector of S8 and D1Is connected with the collector of S8, the collector of S9, and is connected with one end of the filter capacitor C1, the filter capacitor C2 and the filter capacitor C3, the emitter of S9 is connected with the collector of S10, D2Are connected to the anode D1And D2Is connected to an isoelectric point, and C4 is connected to C5, also connected to an isoelectric point.
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| CN112636614A (en) * | 2020-12-16 | 2021-04-09 | 哈尔滨理工大学 | Novel three-level Delta-type connection rectifier |
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