Pulse wave rectifier based on passive three-phase imbalance suppression device

Abstract

The invention discloses a pulse rectifier based on a passive three-phase imbalance suppression device. The pulse rectifier comprises a three-phase to five-phase transformer, the passive three-phase imbalance suppression device, a first five-phase rectifier bridge and a second five-phase rectifier bridge, the input end of the three-phase to five-phase transformer is connected with an external three-phase voltage source, and the output end of the three-phase to five-phase transformer is connected with the input end of the passive three-phase imbalance suppression device; the output end of the passive three-phase imbalance suppression device is respectively connected with the input end of the first five-phase rectifier bridge and the input end of the second five-phase rectifier bridge; wherein the passive three-phase imbalance suppression device comprises five identical core columns, and each core column is sequentially wound with three windings from top to bottom; the first output end of the first five-phase rectifier bridge is connected with the first output end of the second five-phase rectifier bridge. According to the invention, the unbalance of the three-phase current can be suppressed, and the problem that the multi-pulse rectifier cannot suppress the unbalance of the three phases is effectively solved.

Description

Technical Field

[0001] The invention relates to the field of converters, and in particular to a pulse rectifier based on a passive three-phase unbalanced suppression device. Background Art

[0002] As a universal interface for AC and DC power grids, multi-pulse rectifiers have high reliability and strong robustness, but the nonlinearity of diodes produces a large amount of harmonic pollution. Most existing multi-pulse rectifiers are 12-pulse rectifier topologies, and the theoretical value of their input current THD is about 15%, which does not comply with standards such as IEEE 519. In order to effectively suppress the harmonic pollution generated by multi-pulse rectifiers, most existing literature focuses on harmonic suppression methods on the DC side, covering passive, active and hybrid harmonic suppression technologies. From the perspective of changing the basic topology of the rectifier, increasing the number or phases of rectifier bridges with multiple phase shift connections to improve the input power quality of the rectifier has become the current mainstream development trend.

[0003] Increasing the number of phase-shifted multi-connected rectifier bridges means increasing the number of rectifier bridges in series or in parallel. When the rectifier bridges are connected in series, the increase in the number of rectifier bridges increases the rectifier loss and reduces the system efficiency, while the increase in the number of rectifier bridge phases does not increase the rectifier loss. The current mainstream method of increasing the number of rectifier bridge phases is to use a three-phase to five-phase transformer to convert the three-phase input voltage into two sets of five-phase voltages with a phase difference of 18°, which are respectively supplied to two sets of five-phase rectifier bridges, and finally form a 20-pulse rectifier. This method can suppress the inherent harmonics generated by the rectifier, and the THD of the input voltage and current can be reduced to less than 5%, meeting the grid standards. However, when the rectifier has three-phase input or the three-phase impedance is unbalanced, the input current generates a large amount of 20k+9 (k is an integer) and 20k+11 harmonic pollution. At present, there is still a lack of research on the three-phase imbalance suppression method for existing multi-pulse rectifiers, especially 20-pulse rectifiers, both at home and abroad, and there is nothing that can be done to deal with the 20k+9 (k is an integer) and 20k+11 harmonic pollution caused by the three-phase imbalance of the 20-pulse rectifier. Summary of the invention

[0004] The present invention provides a pulse rectifier based on a passive three-phase unbalance suppression device. The pulse rectifier introduces a passive three-phase unbalance suppression device, and by setting five identical core columns and winding three windings on each core column from top to bottom in sequence, the unbalance of the three-phase current is suppressed simultaneously, thereby effectively solving the problem that a multi-pulse rectifier cannot suppress the three-phase unbalance.

[0005] An embodiment of the present invention provides a pulse rectifier based on a passive three-phase unbalanced suppression device, comprising: a three-phase to five-phase transformer, a passive three-phase unbalanced suppression device, a first five-phase rectifier bridge, and a second five-phase rectifier bridge;

[0006] The input end of the three-phase to five-phase transformer is connected to an external three-phase voltage source, and the output end of the three-phase to five-phase transformer is connected to the input end of the passive three-phase unbalance suppression device;

[0007] The output end of the passive three-phase unbalanced suppression device is respectively connected to the input end of the first five-phase rectifier bridge and the input end of the second five-phase rectifier bridge; wherein the passive three-phase unbalanced suppression device comprises five identical core columns, and each core column is wound with three windings in sequence from top to bottom;

[0008] The first output end of the first five-phase rectifier bridge is connected to the first output end of the second five-phase rectifier bridge, the second output end of the first five-phase rectifier bridge is connected to one end of the external load, and the second output end of the second five-phase rectifier bridge is connected to the other end of the external load.

[0009] Further, the passive three-phase unbalance suppression device includes a first core column, a second core column, a third core column, a fourth core column, a fifth core column, a first winding, a second winding, a third winding, a fourth winding, a fifth winding, a sixth winding, a seventh winding, an eighth winding, a ninth winding, a tenth winding, an eleventh winding, a twelfth winding, a thirteenth winding, a fourteenth winding, a fifteenth winding, a first iron yoke and a second iron yoke;

[0010] The tops of the core columns are connected by a first iron yoke, and the bottoms of the core columns are connected by a second iron yoke;

[0011] The first core column is wound with the first winding, the second winding and the third winding in sequence from top to bottom; the second core column is wound with the fourth winding, the fifth winding and the sixth winding in sequence from top to bottom; the third core column is wound with the seventh winding, the eighth winding and the ninth winding in sequence from top to bottom; the fourth core column is wound with the tenth winding, the eleventh winding and the twelfth winding in sequence from top to bottom; the fifth core column is wound with the thirteenth winding, the fourteenth winding and the fifteenth winding in sequence from top to bottom.

[0012] Further, the passive three-phase unbalance suppression device includes: a first input end, a second input end, a third input end, a fourth input end, a fifth input end, a sixth input end, a seventh input end, an eighth input end, a ninth input end, a tenth input end, a first output end, a second output end, a third output end, a fourth output end, a fifth output end, a sixth output end, a seventh output end, an eighth output end, a ninth output end and a tenth output end;

[0013] One end of the first winding is connected to the first input end, the other end of the first winding is connected to one end of the eleventh winding, and the other end of the eleventh winding is connected to the fourth output end;

[0014] One end of the fourth winding is connected to the second input end, the other end of the fourth winding is connected to one end of the fourteenth winding, and the other end of the fourteenth winding is connected to the fifth output end;

[0015] One end of the seventh winding is connected to the third input end, the other end of the seventh winding is connected to one end of the second winding, and the other end of the second winding is connected to the first output end;

[0016] One end of the tenth winding is connected to the fourth input end, the other end of the tenth winding is connected to one end of the fifth winding, and the other end of the fifth winding is connected to the second output end;

[0017] One end of the thirteenth winding is connected to the fifth input end, the other end of the thirteenth winding is connected to one end of the eighth winding, and the other end of the eighth winding is connected to the third output end;

[0018] One end of the twelfth winding is connected to the sixth input end, and the other end of the twelfth winding is connected to the sixth output end;

[0019] One end of the fifteenth winding is connected to the seventh input end, and the other end of the fifteenth winding is connected to the seventh output end;

[0020] One end of the third winding is connected to the eighth input end, and the other end of the third winding is connected to the eighth output end;

[0021] One end of the sixth winding is connected to the ninth input end, and the other end of the sixth winding is connected to the ninth output end;

[0022] One end of the ninth winding is connected to the tenth input end, and the other end of the ninth winding is connected to the tenth output end.

[0023] Further, the first winding, the fourth winding, the seventh winding, the tenth winding and the thirteenth winding form an open-loop pentagonal connection.

[0024] Further, the second winding, the fifth winding, the eighth winding, the eleventh winding and the fourteenth winding form an open-loop pentagonal connection.

[0025] Furthermore, the third winding, the sixth winding, the ninth winding, the twelfth winding and the fifteenth winding form an open-loop five-pointed star connection.

[0026] Further, the number of turns of the first winding, the fourth winding, the seventh winding, the tenth winding and the thirteenth winding are all N1; the number of turns of the second winding, the fifth winding, the eighth winding, the eleventh winding and the fourteenth winding are all N2; the number of turns of the second winding, the fifth winding, the eighth winding, the eleventh winding and the fourteenth winding are all N3; wherein,

[0027] Further, the first five-phase rectifier bridge includes: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a ninth diode and a tenth diode;

[0028] One end of the first diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the first output end;

[0029] One end of the second diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the first output end;

[0030] One end of the third diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the second output end;

[0031] One end of the fourth diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the second output end;

[0032] One end of the fifth diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the third output end;

[0033] One end of the sixth diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the third output end;

[0034] One end of the seventh diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the fourth output end;

[0035] One end of the eighth diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the fourth output end;

[0036] One end of the ninth diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the fifth output end;

[0037] One end of the tenth diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the fifth output end.

[0038] Further, the second five-phase rectifier bridge includes: an eleventh diode, a twelfth diode, a thirteenth diode, a fourteenth diode, a fifteenth diode, a sixteenth diode, a seventeenth diode, an eighteenth diode, a nineteenth diode and a twentieth diode;

[0039] One end of the eleventh diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the sixth output end;

[0040] One end of the twelfth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the sixth output end;

[0041] One end of the thirteenth diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the seventh output end;

[0042] One end of the fourteenth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the seventh output end;

[0043] One end of the fifteenth diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the eighth output end;

[0044] One end of the sixteenth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the eighth output end;

[0045] One end of the seventeenth diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the ninth output end;

[0046] One end of the eighteenth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the ninth output end;

[0047] One end of the nineteenth diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the tenth output end;

[0048] One end of the twentieth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the tenth output end.

[0049] The following beneficial effects are achieved by implementing the present invention:

[0050] The present invention provides a pulse rectifier based on a passive three-phase unbalanced suppression device, the device is composed of a three-phase to five-phase transformer, a passive three-phase unbalanced suppression device, a first five-phase rectifier bridge and a second five-phase rectifier bridge; the input end of the three-phase to five-phase transformer is connected to an external three-phase voltage source, the output end of the three-phase to five-phase transformer is connected to the input end of the passive three-phase unbalanced suppression device; the output end of the passive three-phase unbalanced suppression device is respectively connected to the input end of the first five-phase rectifier bridge and the input end of the second five-phase rectifier bridge; the first output end of the first five-phase rectifier bridge is connected to the first output end of the second five-phase rectifier bridge, the second output end of the first five-phase rectifier bridge is connected to one end of an external load, and the second output end of the second five-phase rectifier bridge is connected to the other end of the external load;

[0051] Since the passive three-phase unbalance suppression device includes five identical cores, each core is wound with three windings from top to bottom, when the three-phase to five-phase transformer inputs two groups of five-phase currents into the passive three-phase unbalance suppression device, the passive three-phase unbalance suppression device utilizes the specific phase difference between the three windings wound on each core, combined with the internal electromagnetic induction and current distribution mechanism, so that the magnetic field interacts and produces a precise phase relationship. This process not only realizes the phase conversion of the current, but also effectively suppresses the three-phase imbalance. Therefore, the pulse rectifier can achieve the harmonic suppression effect without the need for an additional DC side auxiliary circuit, and its structure is simpler. At the same time, it has the ability to suppress three-phase imbalance, successfully solving the traditional problem of multi-pulse rectifier in suppressing three-phase imbalance. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0053] Figure 1 It is a structural schematic diagram of a pulse rectifier based on a passive three-phase unbalance suppression device provided in a certain embodiment of the present application;

[0054] Figure 2 is a winding structure diagram of a passive three-phase unbalance suppression device provided in a certain embodiment of the present application;

[0055] Figure 3 is a structural schematic diagram of a pulse rectifier based on a passive three-phase unbalance suppression device provided in another embodiment of the present application;

[0056] Figure 4is a vector diagram of the fundamental impedance of the passive three-phase unbalance suppression device provided by a certain embodiment of the present application;

[0057] Figure 5 It is a vector diagram of the passive three-phase unbalanced suppression device provided in a certain embodiment of the present application to the 20k+5th harmonic impedance;

[0058] Figure 6 It is a vector diagram of the passive three-phase unbalanced suppression device provided in a certain embodiment of the present application to the 20k+7th harmonic impedance;

[0059] Figure 7 It is a vector diagram of the passive three-phase unbalanced suppression device provided in a certain embodiment of the present application to the 20k+11th harmonic impedance;

[0060] Figure 8 It is a vector diagram of the passive three-phase unbalanced suppression device provided in a certain embodiment of the present application to the 20k+13th harmonic impedance;

[0061] Fig. 9 It is a vector diagram of the passive three-phase unbalanced suppression device provided in a certain embodiment of the present application to the 20k+17th harmonic impedance;

[0062] Fig.10 It is a vector diagram of the passive three-phase unbalanced suppression device provided in a certain embodiment of the present application to the 20k+23 harmonic impedance;

[0063] Fig.11 is a structural diagram of a first five-phase rectifier bridge provided in a certain embodiment of the present application;

[0064] Fig.12 It is a structural diagram of a second five-phase rectifier bridge provided in a certain embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0067] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0068] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0069] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0070] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0071] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0072] See also Figure 1 , is a schematic structural diagram of a pulse rectifier based on a passive three-phase unbalanced suppression device provided by an embodiment of the present invention, comprising: a three-phase to five-phase transformer 1, a passive three-phase unbalanced suppression device 2, a first five-phase rectifier bridge 3 and a second five-phase rectifier bridge 4;

[0073] The input end of the three-phase to five-phase transformer 1 is connected to an external three-phase voltage source 5, and the output end of the three-phase to five-phase transformer 1 is connected to the input end of the passive three-phase unbalance suppression device 2;

[0074] The output end of the passive three-phase unbalanced suppression device 2 is respectively connected to the input end of the first five-phase rectifier bridge 3 and the input end of the second five-phase rectifier bridge 4; wherein the passive three-phase unbalanced suppression device 2 comprises five identical core columns, and each core column is wound with three windings in sequence from top to bottom;

[0075] The first output end of the first five-phase rectifier bridge 3 is connected to the first output end of the second five-phase rectifier bridge 4, the second output end of the first five-phase rectifier bridge 3 is connected to one end of the external load 6, and the second output end of the second five-phase rectifier bridge 4 is connected to the other end of the external load 6;

[0076] See also Figure 2 In a preferred embodiment, the passive three-phase unbalanced suppression device 2 includes a first core column 2-1-1, a second core column 2-1-2, a third core column 2-1-3, a fourth core column 2-1-4, a fifth core column 2-1-5, a first winding 2-2-1, a second winding 2-2-2, a third winding 2-2-3, a fourth winding 2-2-4, a fifth winding 2-2-5, a sixth winding 2-2-6, a seventh winding 2-2-7, an eighth winding 2-2-8, a ninth winding 2-2-9, a tenth winding 2-2-10, an eleventh winding 2-2-11, a twelfth winding 2-2-12, a thirteenth winding 2-2-13, a fourteenth winding 2-2-14, a fifteenth winding 2-2-15, a first iron yoke 2-3-1 and a second iron yoke 2-3-2;

[0077] The tops of the core columns are connected via a first iron yoke 2-3-1, and the bottoms of the core columns are connected via a second iron yoke 2-3-2;

[0078] The first core column 2-1-1 is wound with the first winding 2-2-1, the second winding 2-2-2 and the third winding 2-2-3 in sequence from top to bottom; the second core column 2-1-2 is wound with the fourth winding 2-2-4, the fifth winding 2-2-5 and the sixth winding 2-2-6 in sequence from top to bottom; the third core column 2-1-3 is wound with the seventh winding 2-2-7, the eighth winding 2-2-8 and the ninth winding 2-2-9 in sequence from top to bottom; the fourth core column 2-1-4 is wound with the tenth winding 2-2-10, the eleventh winding 2-2-11 and the twelfth winding 2-2-12 in sequence from top to bottom; the fifth core column 2-1-5 is wound with the thirteenth winding 2-2-13, the fourteenth winding 2-2-14 and the fifteenth winding 2-2-15 in sequence from top to bottom;

[0079] In a preferred embodiment, the passive three-phase unbalanced suppression device 2 includes: a first input terminal 2-4-1, a second input terminal 2-4-2, a third input terminal 2-4-3, a fourth input terminal 2-4-4, a fifth input terminal 2-4-5, a sixth input terminal 2-4-6, a seventh input terminal 2-4-7, an eighth input terminal 2-4-8, a ninth input terminal 2-4-9, a tenth input terminal 2-4-10, a first output terminal 2-5-1, a second output terminal 2-5-2, a third output terminal 2-5-3, a fourth output terminal 2-5-4, a fifth output terminal 2-5-5, a sixth output terminal 2-5-6, a seventh output terminal 2-5-7, an eighth output terminal 2-5-8, a ninth output terminal 2-5-9 and a tenth output terminal 2-5-10;

[0080] One end of the first winding 2-2-1 is connected to the first input end 2-4-1, the other end of the first winding 2-2-1 is connected to one end of the eleventh winding 2-2-11, and the other end of the eleventh winding 2-2-11 is connected to the fourth output end 2-5-4;

[0081] One end of the fourth winding 2-2-4 is connected to the second input end 2-4-2, the other end of the fourth winding 2-2-4 is connected to one end of the fourteenth winding 2-2-14, and the other end of the fourteenth winding 2-2-14 is connected to the fifth output end 2-5-5;

[0082] One end of the seventh winding 2-2-7 is connected to the third input end 2-4-3, the other end of the seventh winding 2-2-7 is connected to one end of the second winding 2-2-2, and the other end of the second winding 2-2-2 is connected to the first output end;

[0083] One end of the tenth winding 2-2-10 is connected to the fourth input terminal 2-4-4, the other end of the tenth winding 2-2-10 is connected to one end of the fifth winding 2-2-5, and the other end of the fifth winding 2-2-5 is connected to the second output terminal 2-5-2;

[0084] One end of the thirteenth winding 2-2-13 is connected to the fifth input terminal 2-4-5, the other end of the thirteenth winding 2-2-13 is connected to one end of the eighth winding 2-2-8, and the other end of the eighth winding 2-2-8 is connected to the third output terminal 2-5-3;

[0085] One end of the twelfth winding 2-2-12 is connected to the sixth input terminal 2-4-6, and the other end of the twelfth winding 2-2-12 is connected to the sixth output terminal 2-5-6;

[0086] One end of the fifteenth winding 2-2-15 is connected to the seventh input terminal 2-4-7, and the other end of the fifteenth winding 2-2-15 is connected to the seventh output terminal 2-5-7;

[0087] One end of the third winding 2-2-3 is connected to the eighth input terminal 2-4-8, and the other end of the third winding 2-2-3 is connected to the eighth output terminal 2-5-8;

[0088] One end of the sixth winding 2-2-6 is connected to the ninth input end 2-4-9, and the other end of the sixth winding 2-2-6 is connected to the ninth output end 2-5-9;

[0089] One end of the ninth winding 2-2-9 is connected to the tenth input terminal 2-4-10, and the other end of the ninth winding 2-2-9 is connected to the tenth output terminal 2-5-10;

[0090] Specifically, the a1 end of the first winding 2-2-1 is connected to the first input end 2-4-1, the a2 end of the first winding 2-2-1 is connected to the a2 end of the eleventh winding 2-2-11, and the a3 end of the eleventh winding 2-2-11 is connected to the fourth output end 2-5-4; the b1 end of the fourth winding 2-2-4 is connected to the second input end 2-4-2, the b2 end of the fourth winding 2-2-4 is connected to the b2 end of the fourteenth winding 2-2-14, and the b3 end of the fourteenth winding 2-2-14 is connected to the fifth output end 2-5-5; The c1 end of the seventh winding 2-2-7 is connected to the third input terminal 2-4-3, the c2 end of the seventh winding 2-2-7 is connected to the c2 end of the second winding 2-2-2, and the c3 end of the second winding 2-2-2 is connected to the first output terminal; the d1 end of the tenth winding 2-2-10 is connected to the fourth input terminal 2-4-4, the d2 end of the tenth winding 2-2-10 is connected to the d2 end of the fifth winding 2-2-5, and the d3 end of the fifth winding 2-2-5 is connected to the second output terminal 2-5-2; the thirteenth winding 2-2-13 is connected to the fourth input terminal 2-4-4, the d2 end of the tenth winding 2-2-10 is connected to the d2 end of the fifth winding 2-2-5, and the d3 end of the fifth winding 2-2-5 is connected to the second output terminal 2-5-2; The e1 terminal is connected to the fifth input terminal 2-4-5, the e2 terminal of the thirteenth winding 2-2-13 is connected to the e2 terminal of the eighth winding 2-2-8, and the e3 terminal of the eighth winding 2-2-8 is connected to the third output terminal 2-5-3; the a4 terminal of the twelfth winding 2-2-12 is connected to the sixth input terminal 2-4-6, and the a5 terminal of the twelfth winding 2-2-12 is connected to the sixth output terminal 2-5-6; the b4 terminal of the fifteenth winding 2-2-15 is connected to the seventh input terminal 2-4-7, and the b5 terminal of the fifteenth winding 2-2-15 is connected to the The seventh output terminal 2-5-7 is connected; the c4 terminal of the third winding 2-2-3 is connected to the eighth input terminal 2-4-8, and the c5 terminal of the third winding 2-2-3 is connected to the eighth output terminal 2-5-8; the d4 terminal of the sixth winding 2-2-6 is connected to the ninth input terminal 2-4-9, and the d5 terminal of the sixth winding 2-2-6 is connected to the ninth output terminal 2-5-9; the e4 terminal of the ninth winding 2-2-9 is connected to the tenth input terminal 2-4-10, and the e5 terminal of the ninth winding 2-2-9 is connected to the tenth output terminal 2-5-10.

[0091] In a preferred embodiment, the first winding 2-2-1, the fourth winding 2-2-4, the seventh winding 2-2-7, the tenth winding 2-2-10 and the thirteenth winding 2-2-13 form an open-loop pentagonal connection mode;

[0092] In a preferred embodiment, the second winding 2-2-2, the fifth winding 2-2-5, the eighth winding 2-2-8, the eleventh winding 2-2-11 and the fourteenth winding 2-2-14 form an open-loop pentagonal connection;

[0093] In a preferred embodiment, the third winding 2-2-3, the sixth winding 2-2-6, the ninth winding 2-2-9, the twelfth winding 2-2-12 and the fifteenth winding 2-2-15 form an open-loop five-pointed star connection mode;

[0094] Specifically, see Figure 3 The three-phase to five-phase transformer 1 can convert the three-phase voltage u sa 、u sb 、u sc Converted into two groups of five-phase voltages with a phase difference of 18° to power the passive three-phase unbalance suppression device 2; the output ends of the first five-phase rectifier bridge 3 and the second five-phase rectifier bridge 4 are connected in series, and the first five-phase rectifier bridge 3 and the second five-phase rectifier bridge 4 are connected in parallel with the load 6;

[0095] Specifically, the three-phase voltage source 5 is used to input the target current into the three-phase to five-phase transformer 1; the three-phase to five-phase transformer 1 is used to perform phase conversion on the target current to obtain a first five-phase current and a second five-phase current, and input the first five-phase current and the second five-phase current into the passive three-phase unbalance suppression device 2, wherein the phase difference between the first five-phase current and the second five-phase current is 18°; the passive three-phase unbalance suppression device 2 is used to input the first five-phase current into the first five-phase rectifier bridge 3, and, input the second five-phase current into the second five-phase rectifier bridge 4; the first five-phase rectifier bridge 3 is used to convert the first five-phase current into a direct current, and output the direct current to the load 6; the second five-phase rectifier bridge 4 is used to convert the second five-phase current into a direct current, and output the direct current to the load 6.

[0096] In a preferred embodiment, the number of turns of the first winding 2-2-1, the fourth winding 2-2-4, the seventh winding 2-2-7, the tenth winding 2-2-10 and the thirteenth winding 2-2-13 are all N1; the number of turns of the second winding 2-2-2, the fifth winding 2-2-5, the eighth winding 2-2-8, the eleventh winding 2-2-11 and the fourteenth winding 2-2-14 are all N2; the number of turns of the second winding 2-2-2, the fifth winding 2-2-5, the eighth winding 2-2-8, the eleventh winding 2-2-11 and the fourteenth winding 2-2-14 are all N3; wherein,

[0097] Specifically, it is assumed that the input current of the pulse rectifier of the present application satisfies

[0098]

[0099] Where, I is the amplitude of the input current;

[0100] According to formula (1) and the three-phase to five-phase transformer 1, the output current of the three-phase to five-phase transformer 1 is obtained, which is specifically expressed as

[0101]

[0102] When the pulse rectifier of the present application has a three-phase (input end) or five-phase (output side of the three-phase to five-phase transformer 1) unbalance factor, the input end of the pulse rectifier will produce harmonic pollution of 20k+5, 20k+7, 20k+11, 20k+13, 20k+17, 20k+23, etc. (k=0, 1, 2...), that is, all odd-order harmonic pollution except the inherent harmonics of the rectifier and the zero-sequence harmonics);

[0103] Therefore, the passive three-phase unbalance suppression device 2 needs to have impedance (to suppress imbalance) for harmonics of 20k+5, 20k+7, 20k+11, 20k+13, 20k+17, 20k+23 and other orders, but no impedance for the fundamental wave (no effect on efficiency and transmission capacity); since the five core columns of the passive three-phase unbalance suppression device 2 are exactly the same, and their connection methods in the rectifier are also symmetrical to each other, the function and analysis method of each core column are exactly the same. For simplicity, the following analysis is taken as an example of the first core column 2-1-1:

[0104] When the same-name terminals are considered, the currents flowing through the three windings of the first core column 2-1-1 are -i a1 、-i c1 、-i c2 From formula (2), we can see that the phase angles are 180°, 144°, and -18° respectively. The vector diagram of the fundamental impedance is as follows: Figure 4 As shown; Figure 3 In, when When , the impedance of the passive three-phase unbalanced suppression device 2 to the fundamental wave is 0;

[0105] Similarly, the vector diagram of the passive three-phase unbalanced suppression device 2 for 20k+5th harmonic impedance is as follows: Figure 5 The impedance of the passive three-phase unbalanced suppression device 2 to the 20k+7th harmonic is as shown in Figure 6 The impedance of the passive three-phase unbalanced suppression device 2 to the 20k+11th harmonic is as shown in Figure 7The impedance of the passive three-phase unbalanced suppression device 2 to the 20k+13th harmonic is as follows: Figure 8 The impedance of the passive three-phase unbalanced suppression device 2 to the 20k+17th harmonic is as shown in Fig. 9 The impedance of the passive three-phase unbalanced suppression device 2 to the 20k+23 harmonic is as shown in Fig.10 shown.

[0106] Depend on Figure 5-Figure 10 It can be seen that the passive three-phase unbalanced suppression device 2 has impedance to harmonics of 20k+5, 20k+7, 20k+11, 20k+13, 20k+17, 20k+23, etc., among which the impedance to the 20k+11 harmonic is the largest, followed by the 20k+7 and 20k+13 harmonics, and then the 20k+5 harmonics, while the impedance to the 20k+17 and 20k+23 harmonics is the smallest. It can be seen that the passive three-phase unbalanced suppression device 2 has no impedance to the fundamental wave, but suppresses the harmonics of 20k+5, 20k+7, 20k+11, 20k+13, 20k+17, 20k+23, etc. generated by the unbalanced factor.

[0107] In a preferred embodiment, the first five-phase rectifier bridge 3 includes: a first diode 3-1, a second diode 3-2, a third diode 3-3, a fourth diode 3-4, a fifth diode 3-5, a sixth diode 3-6, a seventh diode 3-7, an eighth diode 3-8, a ninth diode 3-9 and a tenth diode 3-10;

[0108] One end of the first diode 3-1 is connected to the positive electrode of the first five-phase rectifier bridge 3, and the other end is connected to the first output end 2-5-1;

[0109] One end of the second diode 3-2 is connected to the cathode of the first five-phase rectifier bridge 3, and the other end is connected to the first output end 2-5-1;

[0110] One end of the third diode 3-3 is connected to the positive electrode of the first five-phase rectifier bridge 3, and the other end is connected to the second output end 2-5-2;

[0111] One end of the fourth diode 3-4 is connected to the cathode of the first five-phase rectifier bridge 3, and the other end is connected to the second output end 2-5-2;

[0112] One end of the fifth diode 3-5 is connected to the positive electrode of the first five-phase rectifier bridge 3, and the other end is connected to the third output end 2-5-3;

[0113] One end of the sixth diode 3-6 is connected to the cathode of the first five-phase rectifier bridge 3, and the other end is connected to the third output end 2-5-3;

[0114] One end of the seventh diode 3-7 is connected to the positive electrode of the first five-phase rectifier bridge 3, and the other end is connected to the fourth output terminal 2-5-4;

[0115] One end of the eighth diode 3-8 is connected to the cathode of the first five-phase rectifier bridge 3, and the other end is connected to the fourth output terminal 2-5-4;

[0116] One end of the ninth diode 3-9 is connected to the positive electrode of the first five-phase rectifier bridge 3, and the other end is connected to the fifth output terminal 2-5-5;

[0117] One end of the tenth diode 3 - 10 is connected to the cathode of the first five-phase rectifier bridge 3 , and the other end is connected to the fifth output end 2 - 5 - 5 .

[0118] In a preferred embodiment, the second five-phase rectifier bridge 4 includes: an eleventh diode 4-1, a twelfth diode 4-2, a thirteenth diode 4-3, a fourteenth diode 4-4, a fifteenth diode 4-5, a sixteenth diode 4-6, a seventeenth diode 4-7, an eighteenth diode 4-8, a nineteenth diode 4-9 and a twentieth diode 4-10;

[0119] One end of the eleventh diode 4-1 is connected to the positive electrode of the second five-phase rectifier bridge 4, and the other end is connected to the sixth output terminal 2-5-6;

[0120] One end of the twelfth diode 4-2 is connected to the cathode of the second five-phase rectifier bridge 4, and the other end is connected to the sixth output terminal 2-5-6;

[0121] One end of the thirteenth diode 4-3 is connected to the positive electrode of the second five-phase rectifier bridge 4, and the other end is connected to the seventh output terminal 2-5-7;

[0122] One end of the fourteenth diode 4-4 is connected to the cathode of the second five-phase rectifier bridge 4, and the other end is connected to the seventh output terminal 2-5-7;

[0123] One end of the fifteenth diode 4-5 is connected to the positive electrode of the second five-phase rectifier bridge 4, and the other end is connected to the eighth output terminal 2-5-8;

[0124] One end of the sixteenth diode 4-6 is connected to the cathode of the second five-phase rectifier bridge 4, and the other end is connected to the eighth output terminal 2-5-8;

[0125] One end of the seventeenth diode 4-7 is connected to the positive electrode of the second five-phase rectifier bridge 4, and the other end is connected to the ninth output terminal 2-5-9;

[0126] One end of the eighteenth diode 4-8 is connected to the cathode of the second five-phase rectifier bridge 4, and the other end is connected to the ninth output terminal 2-5-9;

[0127] One end of the nineteenth diode 4-9 is connected to the positive electrode of the second five-phase rectifier bridge 4, and the other end is connected to the tenth output terminal 2-5-10;

[0128] One end of the twentieth diode 4 - 10 is connected to the cathode of the second five-phase rectifier bridge 4 , and the other end is connected to the tenth output end 2 - 5 - 10 .

[0129] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A pulse rectifier based on a passive three-phase unbalanced suppression device, characterized in that: include: A three-phase to five-phase transformer, a passive three-phase unbalance suppression device, a first five-phase rectifier bridge and a second five-phase rectifier bridge; The input end of the three-phase to five-phase transformer is connected to an external three-phase voltage source, and the output end of the three-phase to five-phase transformer is connected to the input end of the passive three-phase unbalance suppression device; The output end of the passive three-phase unbalanced suppression device is respectively connected to the input end of the first five-phase rectifier bridge and the input end of the second five-phase rectifier bridge; wherein the passive three-phase unbalanced suppression device comprises five identical core columns, and each core column is wound with three windings in sequence from top to bottom; The first output end of the first five-phase rectifier bridge is connected to the first output end of the second five-phase rectifier bridge, the second output end of the first five-phase rectifier bridge is connected to one end of the external load, and the second output end of the second five-phase rectifier bridge is connected to the other end of the external load.

2. The pulse rectifier based on the passive three-phase unbalanced suppression device according to claim 1, characterized in that: The passive three-phase unbalance suppression device includes a first core column, a second core column, a third core column, a fourth core column, a fifth core column, a first winding, a second winding, a third winding, a fourth winding, a fifth winding, a sixth winding, a seventh winding, an eighth winding, a ninth winding, a tenth winding, an eleventh winding, a twelfth winding, a thirteenth winding, a fourteenth winding, a fifteenth winding, a first iron yoke and a second iron yoke; The tops of the core columns are connected by a first iron yoke, and the bottoms of the core columns are connected by a second iron yoke; The first core column is wound with the first winding, the second winding and the third winding in sequence from top to bottom; the second core column is wound with the fourth winding, the fifth winding and the sixth winding in sequence from top to bottom; the third core column is wound with the seventh winding, the eighth winding and the ninth winding in sequence from top to bottom; the fourth core column is wound with the tenth winding, the eleventh winding and the twelfth winding in sequence from top to bottom; the fifth core column is wound with the thirteenth winding, the fourteenth winding and the fifteenth winding in sequence from top to bottom.

3. The pulse rectifier based on the passive three-phase unbalanced suppression device according to claim 2, characterized in that: The passive three-phase unbalance suppression device comprises: a first input end, a second input end, a third input end, a fourth input end, a fifth input end, a sixth input end, a seventh input end, an eighth input end, a ninth input end, a tenth input end, a first output end, a second output end, a third output end, a fourth output end, a fifth output end, a sixth output end, a seventh output end, an eighth output end, a ninth output end and a tenth output end; One end of the first winding is connected to the first input end, the other end of the first winding is connected to one end of the eleventh winding, and the other end of the eleventh winding is connected to the fourth output end; One end of the fourth winding is connected to the second input end, the other end of the fourth winding is connected to one end of the fourteenth winding, and the other end of the fourteenth winding is connected to the fifth output end; One end of the seventh winding is connected to the third input end, the other end of the seventh winding is connected to one end of the second winding, and the other end of the second winding is connected to the first output end; One end of the tenth winding is connected to the fourth input end, the other end of the tenth winding is connected to one end of the fifth winding, and the other end of the fifth winding is connected to the second output end; One end of the thirteenth winding is connected to the fifth input end, the other end of the thirteenth winding is connected to one end of the eighth winding, and the other end of the eighth winding is connected to the third output end; One end of the twelfth winding is connected to the sixth input end, and the other end of the twelfth winding is connected to the sixth output end; One end of the fifteenth winding is connected to the seventh input end, and the other end of the fifteenth winding is connected to the seventh output end; One end of the third winding is connected to the eighth input end, and the other end of the third winding is connected to the eighth output end; One end of the sixth winding is connected to the ninth input end, and the other end of the sixth winding is connected to the ninth output end; One end of the ninth winding is connected to the tenth input end, and the other end of the ninth winding is connected to the tenth output end.

4. The pulse rectifier based on the passive three-phase unbalanced suppression device according to claim 3, characterized in that: The first winding, the fourth winding, the seventh winding, the tenth winding and the thirteenth winding are connected in an open-loop pentagonal manner.

5. The pulse rectifier based on the passive three-phase unbalanced suppression device according to claim 3, characterized in that: The second winding, the fifth winding, the eighth winding, the eleventh winding and the fourteenth winding are connected in an open-loop pentagonal manner.

6. The pulse rectifier based on the passive three-phase unbalanced suppression device according to claim 3, characterized in that: The third winding, the sixth winding, the ninth winding, the twelfth winding and the fifteenth winding form an open-loop five-pointed star connection.

7. The pulse rectifier based on the passive three-phase unbalanced suppression device according to claim 3, characterized in that: The number of turns of the first winding, the fourth winding, the seventh winding, the tenth winding and the thirteenth winding are all N1; the number of turns of the second winding, the fifth winding, the eighth winding, the eleventh winding and the fourteenth winding are all N2; the number of turns of the second winding, the fifth winding, the eighth winding, the eleventh winding and the fourteenth winding are all N3; wherein, N1: N2:

8. The pulse rectifier based on the passive three-phase unbalanced suppression device according to claim 3, characterized in that: The first five-phase rectifier bridge includes: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a ninth diode and a tenth diode; One end of the first diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the first output end; One end of the second diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the first output end; One end of the third diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the second output end; One end of the fourth diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the second output end; One end of the fifth diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the third output end; One end of the sixth diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the third output end; One end of the seventh diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the fourth output end; One end of the eighth diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the fourth output end; One end of the ninth diode is connected to the positive electrode of the first five-phase rectifier bridge, and the other end is connected to the fifth output end; One end of the tenth diode is connected to the cathode of the first five-phase rectifier bridge, and the other end is connected to the fifth output end.

9. The pulse rectifier based on the passive three-phase unbalanced suppression device according to claim 3, characterized in that: The second five-phase rectifier bridge includes: an eleventh diode, a twelfth diode, a thirteenth diode, a fourteenth diode, a fifteenth diode, a sixteenth diode, a seventeenth diode, an eighteenth diode, a nineteenth diode and a twentieth diode; One end of the eleventh diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the sixth output end; One end of the twelfth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the sixth output end; One end of the thirteenth diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the seventh output end; One end of the fourteenth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the seventh output end; One end of the fifteenth diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the eighth output end; One end of the sixteenth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the eighth output end; One end of the seventeenth diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the ninth output end; One end of the eighteenth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the ninth output end; One end of the nineteenth diode is connected to the positive electrode of the second five-phase rectifier bridge, and the other end is connected to the tenth output end; One end of the twentieth diode is connected to the cathode of the second five-phase rectifier bridge, and the other end is connected to the tenth output end.

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