CN215300519U - Single-phase and three-phase bridgeless multi-level rectifier with common direct-current bus - Google Patents

Single-phase and three-phase bridgeless multi-level rectifier with common direct-current bus Download PDF

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CN215300519U
CN215300519U CN202120500404.2U CN202120500404U CN215300519U CN 215300519 U CN215300519 U CN 215300519U CN 202120500404 U CN202120500404 U CN 202120500404U CN 215300519 U CN215300519 U CN 215300519U
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leg
terminal
bridge arm
fast recovery
switching device
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程红
王聪
李瑶璞
赵志浩
杨道宽
李昕
于龙飞
袁巍
李壮
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China University of Mining and Technology Beijing CUMTB
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China University of Mining and Technology Beijing CUMTB
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    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Abstract

The invention discloses a bridgeless multi-level rectifier with a common direct-current bus, belonging to an AC/DC conversion technology and a control technology thereof. The converter provides a plurality of main power circuits, each main power circuit is composed of expandable module units and is used for forming a pair of common high-voltage direct-current buses, and the defect that high direct-current bus voltage cannot be generated due to voltage stress limitation of a power switch tube is overcome. The rectifier and the control strategy provided by the invention greatly reduce the number of active power switching tubes required to be used, greatly reduce the cost and control complexity of the converter, conveniently realize the balance control of the flying capacitor voltage on the basis of obtaining multi-level voltage output, and flexibly realize the expansion of any level number. The method has important application value in the fields of medium-high voltage direct current transmission, high-power medium-high voltage variable frequency speed regulation and the like.

Description

Single-phase and three-phase bridgeless multi-level rectifier with common direct-current bus
Technical Field
The utility model belongs to the technical field of well high voltage variable frequency speed governing, in particular to many level current ware of no bridge system implementation scheme with public direct current generating line.
Background
In recent years, Multilevel converters (Multilevel converters) have been successfully applied in the fields of high-voltage high-power frequency conversion speed regulation, active power filtering, high-voltage direct current (HVDC) transmission, reactive power compensation of power systems and the like. The basic circuit topologies of the conventional medium-high voltage multilevel converter can be roughly divided into two types, namely a clamping type and a cell cascade type. Diode-clamped three-level medium-high voltage inverters manufactured by siemens corporation or ABB corporation and cascaded H-bridge medium-high voltage inverters manufactured by robinkon corporation or rituximab corporation, which are widely used in the industry at present, are typical representatives of the two types of products. In any of the two types of medium-high voltage frequency converters, in order to implement high-voltage power conversion by using low-voltage-resistant power electronic devices, an industrial frequency phase-shifting transformer with large volume, complex wiring and high price is required to be used at the input side of the rectifier to realize electrical isolation. This limits their use in many industrial applications.
The cascading multilevel converter without the power frequency transformer has attracted wide attention in the technical field of power electronics in recent years, and is considered to be an ideal implementation scheme of an intelligent power grid interface or a new generation medium-high voltage frequency converter which is suitable for a new energy power generation system to access and meets the distributed power generation requirement. The converter uses a high-frequency transformer to replace a power frequency phase-shifting transformer in the traditional cascade converter to realize electrical isolation, and when the converter is used for bidirectional power transmission, a cascade full-control H bridge multi-level power converter structure is adopted on a rectifying side. When the power converter is used for unidirectional power transmission, a unidirectional cascade multilevel power converter structure (comprising a cascade diode + Boost rectifying circuit, a cascade bridgeless rectifying circuit, a cascade VIENNA rectifying circuit and the like) is adopted at the rectifying side. Compared with the traditional rectifier stage of a medium-high voltage frequency converter, the implementation scheme of the rectifier stage of the converter cancels a power frequency phase-shifting transformer which is large in size, complex in wiring and high in price, so that the size, the weight and the manufacturing cost of a system are effectively reduced. However, such converters also have significant drawbacks, mainly represented by: each phase of N cascade rectifier modules can generate N groups of direct current output ends, and the direct current output ends of the N groups of rectifier modules cannot be directly connected in series to form a pair of common high-voltage direct current output buses because the input ends are not isolated, so that the N groups of rectifier modules cannot be directly used for high-voltage direct current transmission and cannot be directly connected with a multi-level inverter circuit to be used for medium-high voltage frequency conversion speed regulation. In order to realize a common high-voltage direct-current output bus or realize flexible control of N groups of rectified output direct-current voltages, N groups of cascaded rectification modules are necessarily connected with N high-frequency isolation DC-DC conversion modules in sequence, so that the complexity of the topological structure and the control mode of the whole system is increased, and the working efficiency is reduced.
Disclosure of Invention
The utility model aims at overcoming the above-mentioned defect, provide a many level rectifier realization schemes of no bridge with public direct current bus, compare with the rectifier stage of traditional well high-voltage inverter, on the one hand, consider in considerable practical industrial application occasion, the energy does not need the actual demand of transmitting in two directions, the utility model provides a many level rectifier of no bridge can realize energy unilateral transmission, through the topological structure that many level of no bridge can expand, make the quantity of active power switch tube reduce nearly half to greatly reduced the cost of the many level rectifier of no power frequency transformer cascade type and the complexity of control; on the other hand, the high-power unit power factor rectification and conversion under high voltage can be completed by a low-voltage-resistant power switch tube without using a large-volume power frequency phase-shifting transformer at the input end, compared with a multi-level converter without a power frequency transformer, the bridge-free multi-level rectifier provided by the utility model can form a pair of common high-voltage direct current buses on the direct current side, can flexibly realize the balance control of the capacitance voltage of the output side, the bridgeless multi-level rectifier provided by the utility model can select the expandable topological structure according to different application occasions and power grades, the main power circuit has flexible topological structure, small volume, light weight, low cost, simple control and high overall working efficiency of the system, the method has important application value in the fields of medium and high voltage direct current transmission (HVDC), high-power electronic transformers, high-power medium and high voltage alternating current-direct current-alternating current frequency converters and the like.
To achieve the above object, the present invention provides a single-phase bridgeless multi-level rectifier with a common dc bus, comprising a main power circuit, wherein the main power circuit comprises a high-frequency filter, a first module unit (M) (M ═ 2) of M leveln-1, where m and n are positive integers), an output dc capacitor C and a load resistor R, characterized in that: the first module unit (M) comprises a first bridge arm P and a second bridge arm Q which have the same structure, wherein the first bridge arm P comprises M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a) of said first leg P, said switches of said first leg PDevice SP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Said 1 st flying capacitor branch of said first leg P comprises 1 dc capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches in the ith of the second bridge arm Q, i flying capacitor branches in the number of direct-current capacitors, the second bridge arm Q having the same connection structure as the first bridge arm P, and the fast recovery diode D in the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1Is connected to form a positive terminal of a DC output bus and is connected in parallel with the output DC busA capacitor C connected to one end of the load resistor R, and the switching device S of the first arm PPm-1And said switching device S of said second leg QQm-1To form a negative terminal of a dc output bus and to the other end of the load resistor R and the output dc capacitor C connected in parallel, the switching device S of the first leg PP1Is connected in series with the high-frequency filter into an alternating current network, the other end of which is connected with the switching device SQ1Is connected to the first terminal (e).
In order to achieve the above object, the utility model provides an adopt the three-phase parallel rectifier that many level current wares of no bridge that have public DC bus constitute, including three-phase main power circuit, its characterized in that: the three-phase main power circuit comprises three high-frequency filters and three second module units (N) comprising M-level first module units (M) (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, said first modular unit (M) comprising two identical first legs P and second legs Q, said first legs P comprising M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Of said first leg P, of said first leg PThe switching device SP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Said 1 st flying capacitor branch of said first leg P comprises 1 dc capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、 CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、 DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches in the ith of the second bridge arm Q, i flying capacitor branches in the number of direct-current capacitors, the second bridge arm Q having the same connection structure as the first bridge arm P, and the fast recovery diode D in the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1Is connected with the second terminal (b) to form a positive end of a direct current output bus and is connected with the second terminal (b) in parallelAn output DC capacitor C connected to one end of the load resistor R, and the switching device S of the first bridge arm PPm-1And said switching device S of said second leg QQm-1The second terminal (f) of the second module unit (N) is connected with the other end of the load resistor R to form a direct current output bus negative terminal, the direct current output positive terminal (g) of the second module unit (N) of each phase is connected with the direct current output negative terminal (h) of the second module unit (N) of each phase, 2 residual alternating current input ends of the second module unit (N) of each phase are connected, the three phases of the first alternating current input ends of the second module unit (N) form a group of terminals, the three phases of the second alternating current input ends of the second module unit (N) form another group of terminals, one group of terminals are connected to a common neutral point, and the other group of terminals are respectively connected with three high-frequency filters in series to be connected into a three-phase power grid to form a three-phase parallel connection.
In order to achieve the above object, the utility model provides an adopt the three-phase star that many level rectifiers of bridgeless that have public DC bus constitute to connect the rectifier, including three-phase main power circuit, its characterized in that: the main power circuit comprises three high-frequency filters and three second modular units (N) comprising a first modular unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, said first modular unit (M) comprising two identical first legs P and second legs Q, said first legs P comprising M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、 DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a), the switching device S of the first leg PP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Said 1 st flying capacitor branch of said first leg P comprises 1 dc capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、 CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、 DQm-1I flying capacitor branches (where i is 1, 2. m-2), the ith flying capacitor branch of the second leg QThe number of the direct current capacitors is i, the second bridge arm Q has the same connection structure with the first bridge arm P, and the fast recovery diode D of the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1To form a positive terminal of a dc output bus, and to one end of the output dc capacitor C and the load resistor R connected in parallel, the switching device S of the first leg PPm-1And said switching device S of said second leg QQm-1The second terminal (f) is connected to form a negative terminal of a direct current output bus, and is connected with the output direct current capacitor C and the other end of the load resistor R in parallel, 2 residual alternating current input ends of the second module unit (N) are arranged in each phase, the first alternating current input end of the second module unit (N) forms a group of terminals, the second alternating current input end of the second module unit (N) forms another group of terminals, one group of terminals are connected to a common neutral point, the other group of terminals are respectively connected with three high-frequency filters in series to form a three-phase power grid, and star connection is formed.
In order to achieve the above object, the utility model provides an adopt three-phase angle that many level rectifiers of bridgeless constitute of having public DC bus connects rectifier, including three-phase main power circuit, its characterized in that: the main power circuit comprises three high-frequency filters and three second modular units (N) comprising a first modular unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, said first modular unit (M) comprising two identical first legs P and second legs Q, said first legs P comprising M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、 DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P, i flying capacitor branches, and i fast recovery diodes of the first leg PPipe DP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a), the switching device S of the first leg PP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Said 1 st flying capacitor branch of said first leg P comprises 1 dc capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、 CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 quick recovery twoPolar tube DQ1、DQ2······DQm-2、 DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches in the ith of the second bridge arm Q, i flying capacitor branches in the number of direct-current capacitors, the second bridge arm Q having the same connection structure as the first bridge arm P, and the fast recovery diode D in the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1To form a positive terminal of a dc output bus, and to one end of the output dc capacitor C and the load resistor R connected in parallel, the switching device S of the first leg PPm-1And said switching device S of said second leg QQm-1The second wiring terminal (f) of (a) is connected to form a direct current output bus negative terminal, and is connected with the output direct current capacitor C and the other end of the load resistor R in parallel, each phase of the second module unit (N) has 2 residual alternating current input terminals and three phases of the first alternating current input terminal of the second module unit (N) forms a group of wiring terminals and the three phases of the second alternating current input terminal of the second module unit (N) forms another group of wiring terminals, wherein one group of wiring terminals are connected to the input end of a three-phase power grid through three high-frequency filters respectively, and the other group of wiring terminals are sequentially connected to the input end of the next phase in the three-phase power grid to form an angular connection.
In order to achieve the above object, the utility model provides an adopt the two stars of three-phase that constitute of many level rectifier of bridgeless that have public DC bus connects the rectifier, including three-phase main power circuit, its characterized in that: the three-phase main power circuit comprises three high-frequency filters, six bridge arm inductors and six second module units (N), wherein the six second module units (N) form two groups of butted star-shaped connections, each group comprises three second module units (N), and each second module unit (N) comprises a first module unit (M) with M level (M is 2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, said first modular unit (M) comprising two identical first legs P and second legs Q, said first legs P comprising M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a), the switching device S of the first leg PP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Said 1 st flying capacitor branch of said first leg P comprises 1 dc capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1Are connected in series, saidThe fast recovery diode D of the first leg PPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches in the ith of the second bridge arm Q, i flying capacitor branches in the number of direct-current capacitors, the second bridge arm Q having the same connection structure as the first bridge arm P, and the fast recovery diode D in the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1To form a positive terminal of a dc output bus, and to one end of the output dc capacitor C and the load resistor R connected in parallel, the switching device S of the first leg PPm-1And said switching device S of said second leg QQm-1The second terminal (f) of the three-phase bridge arm is connected with the other ends of the output direct-current capacitor C and the load resistor R which are connected in parallel to form a negative terminal of a direct-current output bus, the three-phase three-star connection with the first alternating-current input end of the second module unit (N) forms a group of terminals, the three-phase three-star connection with the second alternating-current input end of the second module unit (N) forms another group of terminals, one group of terminals is connected to a common neutral point, the other group of terminals is respectively connected with one end of three bridge arm inductors, the other ends of the two bridge arm inductors on each phase of bridge arm are respectively connected with the input end of a three-phase power grid through one of the three high-frequency filters, and simultaneously, the common neutral point in the first group of star connections and the common neutral point in the second group of star connections are respectively connected with the two ends of the direct-current capacitor, forming a double star connection.
The utility model has the advantages of many level current wares of no bridge of public DC bus with positive effect lie in: compared with the traditional rectifier stage of a medium-high voltage frequency converter, on one hand, the practical requirement that energy is not required to be transmitted in two directions in a considerable practical industrial application occasion is considered, the utility model provides a bridgeless multi-level rectifier can realize unidirectional energy transmission, and through a bridgeless multi-level expandable topological structure, the quantity of active power switch tubes is reduced by nearly half, thereby greatly reducing the cost of the cascade multi-level converter without a power frequency transformer and the complexity of control; on the other hand, the high-power unit power factor rectification and conversion under high voltage can be completed by a low-voltage-resistant power switch tube without using a large-volume power frequency phase-shifting transformer at the input end, compared with a multi-level converter without a power frequency transformer, the bridge-free multi-level rectifier provided by the utility model can form a pair of common high-voltage direct current buses on the direct current side, can flexibly realize the balance control of the capacitance voltage of the output side, the bridgeless multi-level rectifier provided by the utility model can select the expandable topological structure according to different application occasions and power grades, the main power circuit has flexible topological structure, small volume, light weight, low cost, simple control and high overall working efficiency of the system, the method has important application value in the fields of medium and high voltage direct current transmission (HVDC), high-power electronic transformers, high-power medium and high voltage alternating current-direct current-alternating current frequency converters and the like.
The present invention will be further explained with reference to the accompanying drawings.
Drawings
Fig. 1 is a circuit diagram of a first module unit (M) of the bridgeless multi-level rectifier with a common dc bus according to the present invention;
fig. 2 is a circuit diagram of a second module unit (N) in the bridgeless multi-level rectifier with a common dc bus according to the present invention;
fig. 3 is a circuit diagram of a three-phase parallel rectifier of the bridgeless multi-level rectifier with a common dc bus according to the present invention;
fig. 4 is a circuit diagram of a three-phase star-connected rectifier of the bridgeless multi-level rectifier with a common dc bus according to the present invention;
fig. 5 is a circuit diagram of a three-phase angle rectifier of the bridgeless multi-level rectifier of the present invention with a common dc bus;
fig. 6 is a circuit diagram of a three-phase double star rectifier of the bridgeless multi-level rectifier with a common dc bus according to the present invention;
fig. 7 is a three-phase input current waveform of a three-phase parallel rectifier formed by bridgeless multi-level rectifiers with a common dc bus according to the present invention;
fig. 8 is a three-phase output dc voltage waveform of a three-phase parallel rectifier formed by bridgeless multi-level rectifiers with a common dc bus according to the present invention;
fig. 9 shows an input side five-level voltage waveform of a three-phase parallel rectifier including a bridgeless multi-level rectifier having a common dc bus according to the present invention.
Detailed Description
The following describes the embodiments and working principles of the present invention with reference to the accompanying drawings:
referring to fig. 1 and 2, a bridgeless multi-level rectifier having a common dc bus includes a main power circuit including a high frequency filter, a first module unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, the first modular unit (M) comprises two identical first legs P and second legs Q, the first leg P comprises M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the first bridge arm P is i, and the fast recovery diode D of the first bridge arm P isP1And the fast recovery diode D of the first leg PP2Is connected to the first terminal (a) of the first leg P, the fast recovery diode D of the first leg PP2And the fast recovery diode D of the first leg PP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2Second terminal (b) according toFast recovery diode D of second bridge arm P and first bridge arm PPm-1Is connected to the first terminal (a) of the first leg P, the switching device S of the first leg PP1And the switching device S of the first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And the switching device S of the first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2Second terminal (f) of (a) and the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And the switching device S of the first leg PP1Is connected to the first terminal (e), the 1 st flying capacitor branch of the first leg P comprises 1 dc capacitor CP1Fast recovery diode D of the first leg PP1And the switching device S of the first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、 CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1Series connected, fast recovery diodes D of the first leg PPm-2And the switching device S of the first leg PPm-2The second terminal (f) is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the second bridge arm Q is i, the second bridge arm Q has the same connection structure with the first bridge arm P, and the fast recovery diode D of the first bridge arm PPm-1And the fast recovery diode D of the second leg QQm-1Is connected with the second terminal (b) to form a positive end of a direct current output bus, and is connected with one end of an output direct current capacitor C and a load resistor R which are connected in parallel, and a switching device S of a first bridge arm PPm-1Second terminal (f)Switching device S with second leg QQm-1Is connected with the other end of the load resistor R and the output direct current capacitor C which are connected in parallel, and the switching device S of the first bridge arm PP1The first terminal (e) is connected in series with the high-frequency filter to be connected into an alternating current network, and the other end of the alternating current network is connected with a switching device SQ1Is connected to the first terminal (e).
Referring to fig. 1, 2 and 3, a three-phase parallel rectifier formed by bridgeless multi-level rectifiers with a common dc bus comprises a three-phase main power circuit including three high frequency filters and three second module units (N) including a first module unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, the first modular unit (M) comprises two identical first legs P and second legs Q, the first leg P comprises M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the first bridge arm P is i, and the fast recovery diode D of the first bridge arm P isP1And the fast recovery diode D of the first leg PP2Is connected to the first terminal (a) of the first leg P, the fast recovery diode D of the first leg PP2And the fast recovery diode D of the first leg PP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2Second terminal (b) of (a) and fast recovery diode (D) of first leg (P) in turnPm-1Is connected to the first terminal (a) of the first leg P, the switching device S of the first leg PP1And the switching device S of the first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And the switching device S of the first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2To (1) aTwo terminals (f) are sequentially connected with the switching device S of the first bridge arm PPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And the switching device S of the first leg PP1Is connected to the first terminal (e), the 1 st flying capacitor branch of the first leg P comprises 1 dc capacitor CP1Fast recovery diode D of the first leg PP1And the switching device S of the first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、 CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1Series connected, fast recovery diodes D of the first leg PPm-2And the switching device S of the first leg PPm-2The second terminal (f) is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the second bridge arm Q is i, the second bridge arm Q has the same connection structure with the first bridge arm P, and the fast recovery diode D of the first bridge arm PPm-1And the fast recovery diode D of the second leg QQm-1Is connected with the second terminal (b) to form a positive end of a direct current output bus, and is connected with one end of an output direct current capacitor C and a load resistor R which are connected in parallel, and a switching device S of a first bridge arm PPm-1And the second terminal (f) of the second leg Q and the switching device S of the second leg QQm-1The second terminal (f) of the three-phase second module unit (N) is connected to form a DC output bus negative terminal and is connected with the other ends of the output DC capacitor C and the load resistor R which are connected in parallel, the DC output positive terminal (g) of each phase of the second module unit (N) is connected, the DC output negative terminal (h) of each phase of the second module unit (N) is connected, 2 residual AC input terminals of each phase of the second module unit (N) are connected, and the first AC input terminals of the three-phase second module unit (N) form a group connectionAnd the other group of the terminals are respectively connected with the three high-frequency filters in series and are connected into a three-phase power grid to form three-phase parallel connection.
Referring to fig. 1, 2 and 4, a three-phase star rectifier formed by bridgeless multi-level rectifiers with a common dc bus comprises a three-phase main power circuit including three high frequency filters and three second module units (N) including a first module unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, the first modular unit (M) comprises two identical first legs P and second legs Q, the first leg P comprises M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the first bridge arm P is i, and the fast recovery diode D of the first bridge arm P isP1And the fast recovery diode D of the first leg PP2Is connected to the first terminal (a) of the first leg P, the fast recovery diode D of the first leg PP2And the fast recovery diode D of the first leg PP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2Second terminal (b) of (a) and fast recovery diode (D) of first leg (P) in turnPm-1Is connected to the first terminal (a) of the first leg P, the switching device S of the first leg PP1And the switching device S of the first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And the switching device S of the first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2Second terminal (f) of (a) and the switching device S of the first leg P in turnPm-1First leg P is connected to a first terminal (e) of the first leg P, and a second leg P is quickly restoredPolar tube DP1And the switching device S of the first leg PP1Is connected to the first terminal (e), the 1 st flying capacitor branch of the first leg P comprises 1 dc capacitor CP1Fast recovery diode D of the first leg PP1And the switching device S of the first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1Series connected, fast recovery diodes D of the first leg PPm-2And the switching device S of the first leg PPm-2The second terminal (f) is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the second bridge arm Q is i, the second bridge arm Q has the same connection structure with the first bridge arm P, and the fast recovery diode D of the first bridge arm PPm-1And the fast recovery diode D of the second leg QQm-1Is connected with the second terminal (b) to form a positive end of a direct current output bus, and is connected with one end of an output direct current capacitor C and a load resistor R which are connected in parallel, and a switching device S of a first bridge arm PPm-1And the second terminal (f) of the second leg Q and the switching device S of the second leg QQm-1The second terminal (f) of the three-phase second module unit (N) is connected with the other end of the load resistor R and the output direct current capacitor C which are connected in parallel to form the negative terminal of a direct current output bus, the other end of the load resistor R is connected with the other end of the output direct current capacitor C which is connected in parallel to the other end of the load resistor R, 2 alternating current input ends are remained in each phase of the second module unit (N), the first alternating current input ends of the three-phase second module unit (N) form a group of terminal, the second alternating current input ends of the three-phase second module unit (N) form another group of terminal, one group of terminal is connected to a common neutral point, the other group of terminal is respectively connected with three high-frequency filters in series to be connected into a three-phase power grid to form a star connection。
Referring to fig. 1, 2 and 5, a three-phase angle rectifier formed by bridgeless multi-level rectifiers with a common dc bus comprises a three-phase main power circuit including three high frequency filters and three second module units (N) including a first module unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, the first modular unit (M) comprises two identical first legs P and second legs Q, the first leg P comprises M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the first bridge arm P is i, and the fast recovery diode D of the first bridge arm P isP1And the fast recovery diode D of the first leg PP2Is connected to the first terminal (a) of the first leg P, the fast recovery diode D of the first leg PP2And the fast recovery diode D of the first leg PP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2Second terminal (b) of (a) and fast recovery diode (D) of first leg (P) in turnPm-1Is connected to the first terminal (a) of the first leg P, the switching device S of the first leg PP1And the switching device S of the first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And the switching device S of the first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2Second terminal (f) of (a) and the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And the switching device S of the first leg PP1Is connected to the first terminal (e), the 1 st flying capacitor branch of the first leg P comprises 1 dc capacitor CP1Fast recovery diode D of the first leg PP1Second of (2)Terminal (b) and switching device S of first bridge arm PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1Series connected, fast recovery diodes D of the first leg PPm-2And the switching device S of the first leg PPm-2The second terminal (f) is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the second bridge arm Q is i, the second bridge arm Q has the same connection structure with the first bridge arm P, and the fast recovery diode D of the first bridge arm PPm-1And the fast recovery diode D of the second leg QQm-1Is connected with the second terminal (b) to form a positive end of a direct current output bus, and is connected with one end of an output direct current capacitor C and a load resistor R which are connected in parallel, and a switching device S of a first bridge arm PPm-1And the second terminal (f) of the second leg Q and the switching device S of the second leg QQm-1The second terminal (f) is connected to form a negative terminal of a direct current output bus, and is connected with the other ends of an output direct current capacitor C and a load resistor R which are connected in parallel, 2 alternating current input ends are remained in each phase of the second module unit (N), a first alternating current input end of the three-phase second module unit (N) forms a group of terminals, a second alternating current input end of the three-phase second module unit (N) forms another group of terminals, one group of terminals are respectively connected to the input end of the three-phase power grid through three high-frequency filters, and the other group of terminals are sequentially connected to the input end of the next phase in the three-phase power grid to form an angular connection.
Referring to fig. 1, 2 and 6, the three-phase double-star connection rectifier formed by the bridgeless multi-level rectifier with the common direct current bus comprises a three-phase main power circuit, wherein the three-phase main power circuit comprises three high-frequency filters and six high-frequency filtersBridge arm inductance and six second modular unit (N), six second modular unit (N) constitute two sets of star connection of butt joint, and each set includes three second modular unit (N), and second modular unit (N) includes first modular unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, the first modular unit (M) comprises two identical first legs P and second legs Q, the first leg P comprises M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the first bridge arm P is i, and the fast recovery diode D of the first bridge arm P isP1And the fast recovery diode D of the first leg PP2Is connected to the first terminal (a) of the first leg P, the fast recovery diode D of the first leg PP2And the fast recovery diode D of the first leg PP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2Second terminal (b) of (a) and fast recovery diode (D) of first leg (P) in turnPm-1Is connected to the first terminal (a) of the first leg P, the switching device S of the first leg PP1And the switching device S of the first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And the switching device S of the first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2Second terminal (f) of (a) and the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And the switching device S of the first leg PP1Is connected to the first terminal (e), the 1 st flying capacitor branch of the first leg P comprises 1 dc capacitor CP1Fast recovery diode D of the first leg PP1And the switching device S of the first leg PP1Respectively with the 1 st flying crossTwo ends of the capacitance branch are connected in analogy, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、 CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1Series connected, fast recovery diodes D of the first leg PPm-2And the switching device S of the first leg PPm-2The second terminal (f) is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (wherein i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the second bridge arm Q is i, the second bridge arm Q has the same connection structure with the first bridge arm P, and the fast recovery diode D of the first bridge arm PPm-1And the fast recovery diode D of the second leg QQm-1Is connected with the second terminal (b) to form a positive end of a direct current output bus, and is connected with one end of an output direct current capacitor C and a load resistor R which are connected in parallel, and a switching device S of a first bridge arm PPm-1And the second terminal (f) of the second leg Q and the switching device S of the second leg QQm-1The second terminal (f) of the three-phase star-connection second module unit (N) is connected with the other ends of the output direct-current capacitor C and the load resistor R which are connected in parallel to form a negative terminal of a direct-current output bus, the other ends of the three-phase star-connection second module unit (N) are connected with the other ends of the load resistor R, the other 2 alternating-current input ends of each second module unit (N) are connected with the first alternating-current input end of the three-phase star-connection third module unit (N) to form a group of terminals, one group of the terminals is connected with a common neutral point, the other group of the terminals is respectively connected with one end of three bridge arm inductors, the other ends of the two bridge arm inductors on each phase of the bridge arms are respectively connected with the input end of a three-phase power grid through one of three high-frequency filters, and simultaneously, the common neutral point in the first group of star-connection and the common neutral point in the second group of star-connection are respectively connected with the two ends of the direct-current capacitor, forming a double star connection.
Referring to fig. 7, for the embodiment of the utility model provides an in the embodiment have many level rectifier of bridgeless of public direct current generating line three-phase input current waveform of the three-phase parallel rectifier that constitutes, under the unbalanced condition of three-phase current, the application the utility model discloses a control strategy also can realize that three-phase input current is balanced, and the current waveform quality is better, and is similar sinusoidal.
Referring to fig. 8, the embodiment of the present invention is a three-phase total output dc side voltage U formed by a bridgeless multi-level rectifier with a common dc busoThe voltage waveform on the direct current side has short time for reaching the steady state, and the direct current voltage has small fluctuation.
Referring to fig. 9, an input side five-level voltage waveform of a three-phase parallel rectifier composed of bridgeless multi-level rectifiers with a common dc bus according to an embodiment of the present invention.
In other embodiments of the present invention, the described three-phase star connection, corner connection and three-phase double star connection rectifiers may be a combination of different circuits derived from the second module unit (N) in addition to the second module unit (N).
The described bridgeless multi-level rectifier circuit with the common direct-current bus can be simply applied to a high-power electronic rectification topological structure, the working efficiency of a system can be improved through a proper control strategy, the capacitance voltage at the direct-current side can be stably balanced, favorable conditions are provided for the later-stage electric energy conversion, and the bridge-free multi-level rectifier circuit has important application values in the application fields of medium-high voltage direct-current transmission, high-power electronic transformers, high-power medium-high voltage alternating-direct-alternating current frequency converters and the like.
The above-mentioned embodiments are only described for the preferred embodiments of the present invention, and are not intended to limit the concept and scope of the present invention, and all the modifications and improvements made by the technical solutions of the present invention by the ordinary engineers in the art should fall into the protection scope of the present invention without departing from the design of the present invention.

Claims (5)

1. A single-phase bridgeless multi-level rectifier with a common DC bus comprises a main power circuit including a high-frequency filter, a first module unit (M) (M2) of M leveln-1, where m and n are positive integers), an output dc capacitor C and a load resistor R, characterized in that: the first module unit (M) comprises a first bridge arm P and a second bridge arm Q which have the same structure, wherein the first bridge arm P comprises M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a), the switching device S of the first leg PP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Is connected to said first terminal (e) of said first leg P1 flying capacitor branch comprises 1 direct current capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches in the ith of the second bridge arm Q, i flying capacitor branches in the number of direct-current capacitors, the second bridge arm Q having the same connection structure as the first bridge arm P, and the fast recovery diode D in the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1To form a positive terminal of a dc output bus, and to one end of the output dc capacitor C and the load resistor R connected in parallel, the switching device S of the first leg PPm-1And said switching device S of said second leg QQm-1To form a negative terminal of a dc output bus and to the other end of the load resistor R and the output dc capacitor C connected in parallel, the switching device S of the first leg PP1Is connected in series with the high-frequency filter into an alternating current network, the other end of which is connected with the switching device SQ1Is connected to the first terminal (e).
2. A three-phase parallel rectifier is composed of a common DC power supplyMany level rectifiers of no bridge of generating line constitute, including three-phase main power circuit, its characterized in that: the three-phase main power circuit comprises three high-frequency filters and three second module units (N) comprising M-level first module units (M) (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, said first modular unit (M) comprising two identical first legs P and second legs Q, said first legs P comprising M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a), the switching device S of the first leg PP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Is connected to a first terminal (e), said first leg PThe 1 st flying capacitor branch comprises 1 DC capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches in the ith of the second bridge arm Q, i flying capacitor branches in the number of direct-current capacitors, the second bridge arm Q having the same connection structure as the first bridge arm P, and the fast recovery diode D in the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1To form a positive terminal of a dc output bus, and to one end of the output dc capacitor C and the load resistor R connected in parallel, the switching device S of the first leg PPm-1And said switching device S of said second leg QQm-1Second terminal (f) of (b) is connected to form a DC output bus negative terminal, and is connected in parallel with output DC capacitor C and the other end of load resistor R are connected, every phase the DC output positive terminal (g) of second module unit (N) is connected, every phase the DC output negative terminal (h) of second module unit (N) is connected, every phase the second module unit (N) has 2 residual AC input terminals, three phases the first AC input terminal of second module unit (N) forms a group of terminal, three phases the second AC input terminal of second module unit (N)And the other group of connecting terminals are connected with three high-frequency filters in series respectively and are connected into a three-phase power grid to form three-phase parallel connection.
3. A three-phase star-connected rectifier is composed of a bridgeless multi-level rectifier with a common direct-current bus, and comprises a three-phase main power circuit, and is characterized in that: the main power circuit comprises three high-frequency filters and three second modular units (N) comprising a first modular unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, said first modular unit (M) comprising two identical first legs P and second legs Q, said first legs P comprising M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a), the switching device S of the first leg PP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so onThe switching device SPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Said 1 st flying capacitor branch of said first leg P comprises 1 dc capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches in the ith of the second bridge arm Q, i flying capacitor branches in the number of direct-current capacitors, the second bridge arm Q having the same connection structure as the first bridge arm P, and the fast recovery diode D in the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1To form a positive terminal of a dc output bus, and to one end of the output dc capacitor C and the load resistor R connected in parallel, the switching device S of the first leg PPm-1And said switching device S of said second leg QQm-1Is connected with the second terminal (f) to form the negative terminal of the DC output bus and is connected with the output DC capacitor C and the other end of the load resistor R which are connected in parallelThe two-phase high-frequency filter is connected with the three high-frequency filters in series, and is connected with a three-phase power grid to form star connection.
4. A three-phase angle joint rectifier is formed by a bridgeless multi-level rectifier with a common direct current bus, and comprises a three-phase main power circuit, and is characterized in that: the main power circuit comprises three high-frequency filters and three second modular units (N) comprising a first modular unit (M) of M level (M2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, said first modular unit (M) comprising two identical first legs P and second legs Q, said first legs P comprising M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected to the first terminal (a) of the first leg P, and so on, the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a), the switching device S of the first leg PP1And said switching device S of said first leg PP2Is connected to the first terminal (e), saidSaid switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Said 1 st flying capacitor branch of said first leg P comprises 1 dc capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches in the ith of the second bridge arm Q, i flying capacitor branches in the number of direct-current capacitors, the second bridge arm Q having the same connection structure as the first bridge arm P, and the fast recovery diode D in the first bridge arm PPm-1And said fast recovery diode D of said second leg QQm-1To form a positive terminal of a dc output bus, and to one end of the output dc capacitor C and the load resistor R connected in parallel, the switching device S of the first leg PPm-1And a second terminal (f) and the first terminalSaid switching device S of two bridge arms QQm-1The second wiring terminal (f) of (a) is connected to form a direct current output bus negative terminal, and is connected with the output direct current capacitor C and the other end of the load resistor R in parallel, each phase of the second module unit (N) has 2 residual alternating current input terminals and three phases of the first alternating current input terminal of the second module unit (N) forms a group of wiring terminals and the three phases of the second alternating current input terminal of the second module unit (N) forms another group of wiring terminals, wherein one group of wiring terminals are connected to the input end of a three-phase power grid through three high-frequency filters respectively, and the other group of wiring terminals are sequentially connected to the input end of the next phase in the three-phase power grid to form an angular connection.
5. The utility model provides a three-phase two star connects rectifier comprises the many level rectifier of no bridge that has public direct current bus, includes three-phase main power circuit, its characterized in that: the three-phase main power circuit comprises three high-frequency filters, six bridge arm inductors and six second module units (N), wherein the six second module units (N) form two groups of butted star-shaped connections, each group comprises three second module units (N), and each second module unit (N) comprises a first module unit (M) with M level (M is 2)n-1, wherein M and n are positive integers), an output dc capacitor C and a load resistor R, said first modular unit (M) comprising two identical first legs P and second legs Q, said first legs P comprising M-1 switching devices SP1、SP2······SPm-2、SPm-1M-1 fast recovery diodes DP1、DP2······DPm-2、DPm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), i flying capacitor branches of the first leg P have i direct-current capacitors, and the fast recovery diode D of the first leg P has i direct-current capacitorsP1With the fast recovery diode D of the first leg P and a second terminal (b) ofP2Is connected to the first terminal (a) of the fast recovery diode D of the first leg PP2With the fast recovery diode D of the first leg P and a second terminal (b) ofP3Is connected with the first terminal (a) of the typePush-to-put the fast recovery diode D of the first leg PPm-2With the fast recovery diode D of the first leg P in turnPm-1Is connected to the first terminal (a), the switching device S of the first leg PP1And said switching device S of said first leg PP2Is connected to the first terminal (e) of the first leg P, the switching device S of the first leg PP2And said switching device S of said first leg PP3Is connected to the first terminal (e) of the first leg P, and so on, the switching device S of the first leg PPm-2With the switching device S of the first leg P in turnPm-1Is connected to the first terminal (e) of the first leg P, the fast recovery diode D of the first leg PP1And said switching device S of said first leg PP1Said 1 st flying capacitor branch of said first leg P comprises 1 dc capacitor CP1Said fast recovery diode D of said first leg PP1And said switching device S of said first leg PP1The second terminal (f) of the first bridge arm P is respectively connected with two ends of the 1 st flying capacitor branch, and so on, the ith flying capacitor branch of the first bridge arm P comprises i direct current capacitors CP(m-1)(m-2)/2、CP(m-1)(m-2)/2-1······CP(m-1)(m-2)/2-i+1The fast recovery diodes D of the first leg P connected in seriesPm-2And said switching device S of said first leg PPm-2The second terminal (f) of the second bridge arm Q is respectively connected with two ends of the ith flying capacitor branch, and the second bridge arm Q comprises m-1 switching devices SQ1、SQ2······SQm-2、SQm-1M-1 fast recovery diodes DQ1、DQ2······DQm-2、DQm-1I flying capacitor branches (where i is 1, 2. cndot. m-2), the number of the i flying capacitor branches of the second bridge arm Q is i, the second bridge arm Q has the same connection structure as the first bridge arm P, and the first bridge arm P has the same connection structure as the first bridge arm P, and the second bridge arm Q has the same number of direct capacitors as the first bridge arm P, and the first bridge arm P has the same number of direct capacitors as the second bridge arm Q, and the second bridge arm Q has the same number of direct capacitors as the first bridge arm P, and the second bridge arm Q has the same number as the second bridge arm P, and the first bridge arm P, and the second bridge arm Q, and the first bridge arm P, and the second bridge arm, and the second bridge, the second bridge arm, the second bridge, and the second bridge arm, and the second bridge, and the second bridge arm, and the second bridge, and the second bridge arm, and the second bridge, the second bridge arm, and the second bridge arm, and the second bridge, and the second bridge arm, and the second bridge, andfast recovery diode DPm-1And said fast recovery diode D of said second leg QQm-1To form a positive terminal of a dc output bus, and to one end of the output dc capacitor C and the load resistor R connected in parallel, the switching device S of the first leg PPm-1And said switching device S of said second leg QQm-1The second terminal (f) of the three-phase bridge arm is connected with the other ends of the output direct-current capacitor C and the load resistor R which are connected in parallel to form a negative terminal of a direct-current output bus, the three-phase three-star connection with the first alternating-current input end of the second module unit (N) forms a group of terminals, the three-phase three-star connection with the second alternating-current input end of the second module unit (N) forms another group of terminals, one group of terminals is connected to a common neutral point, the other group of terminals is respectively connected with one end of three bridge arm inductors, the other ends of the two bridge arm inductors on each phase of bridge arm are respectively connected with the input end of a three-phase power grid through one of the three high-frequency filters, and simultaneously, the common neutral point in the first group of star connections and the common neutral point in the second group of star connections are respectively connected with the two ends of the direct-current capacitor, forming a double star connection.
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