High-performance rectification power supply
By designing a high-performance rectifier power supply and using a three-winding rectifier transformer and harmonic cancellation reactor coupling, the problems of large output ripple, high harmonics, low power factor, and system instability of conventional rectifier power supplies were solved, achieving the effects of controllable output voltage, low harmonics, and high power factor.
Patent Information
- Application Number
- CN202422918480.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Conventional three-phase six-pulse rectifier power supplies have large output DC voltage ripple, high grid-side harmonics, and low power factor. Conventional PWM rectifier power supplies have large pulsation of subharmonic currents on the secondary side of the transformer switching frequency and circulating current in high-power situations, resulting in unstable system operation.
The high-performance rectifier power supply consists of a switch cabinet, a three-winding rectifier transformer, a harmonic cancellation reactor and a PWM rectifier cabinet. Through the in-phase design of the three-winding rectifier transformer and the coupling of the harmonic cancellation reactor, the switching frequency subharmonic current and circulating current are suppressed, thereby improving system stability.
The output DC voltage is controllable, the DC voltage ripple is small, the AC grid side harmonics are small, the power factor is high, and the system operation is stable, which is particularly suitable for large-capacity occasions.
Smart Images
Figure CN223451820U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of rectifier power supply, specifically relates to a high-performance rectifier power supply. BACKGROUND
[0002] Rectifier power supply is widely used in industry, such as automobile electric drive speed regulation system test rectifier power supply, ship electric propulsion system test rectifier power supply, etc.
[0003] Conventional three-phase six-pulse rectifier power supply has the defects of large output DC voltage ripple, high network side harmonic, low power factor and unadjustable, and cannot meet the use requirements of some high requirements occasions.
[0004] Although general small-capacity PWM rectifier power supply can solve the defects of large DC ripple, high network side harmonic and low power factor, when used in high-power occasions, there are problems such as large transformer secondary side switching frequency sub-harmonic current ripple, large circulating current and unstable system operation. INVENTION CONTENTS
[0005] In order to overcome the defects of conventional three-phase six-pulse rectifier power supply topology, such as large output DC voltage ripple, high network side harmonic, low power factor, and large transformer secondary side switching frequency sub-harmonic current ripple, large circulating current and unstable system operation of conventional PWM rectifier power supply, the utility model provides a high-performance rectifier power supply.
[0006] The utility model discloses a technical scheme that solves its technical problems: a high-performance rectifier power supply is composed of a switch cabinet, a three-winding rectifier transformer, a harmonic cancellation reactor and a PWM rectifier cabinet; the output end of the switch cabinet is connected with the input end of the three-winding rectifier transformer, the two secondary sides of the three-winding rectifier transformer are in the same phase, the output end of the three-winding rectifier transformer is connected with the input end of the harmonic cancellation reactor, the harmonic cancellation reactor is composed of the reactors of the first secondary side and the second secondary side of the three-winding rectifier transformer, the output end of the harmonic cancellation reactor is connected with the input end of the PWM rectifier cabinet, and the output end of the PWM rectifier cabinet is connected in series and parallel according to the output voltage requirement and then outputs.
[0007] The high-performance rectifier power supply has a set of three-phase windings for the reactors of the first secondary side and the second secondary side of the three-winding rectifier transformer, and the two sets of windings have the same structure and share the magnetic circuit.
[0008] The high-performance rectifier power supply has the same side for the same end of the two sets of windings
[0009] The utility model discloses a technical effect is: the utility model discloses a PWM rectification is adopted to realize the controllable output DC voltage, the small DC voltage pulsation, the small AC network side harmonic, the high power factor and so on advantage, the three winding rectifier transformer of vice side homophase is adopted, and the harmonic canceling reactor is adopted, and the switching frequency subharmonic current and transformer vice side circulation that PWM rectification cabinet generates when the large capacity rectification output is effectively suppressed, and the system operation stability is promoted, the three -phase winding common core magnetic circuit of the reactor of rectifier transformer first vice side and second vice side is adopted, and the scheme such as same structure, same name end is in the same side makes two transformer vice side branch's fundamental wave current magnetic flux cancellation, harmonic magnetic flux strengthens, enhances the magnetic coupling degree of harmonic canceling reactor, effectively reduces the volume weight of harmonic canceling reactor.
[0010] Compared with the conventional three -phase six -pulse wave rectification power supply, the utility model has the advantages of controllable output DC voltage, small pulsation, small AC network side harmonic, high power factor and so on, and compared with the ordinary PWM rectification, it has the advantages of small switching frequency subharmonic current pulsation, small circulation, stable operation and the like when the transformer vice side is large capacity output, and is especially suitable for high rectification output voltage quality requirement, small AC network side harmonic, high power factor and large capacity rectification occasions. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the structural schematic diagram of the utility model.
[0012] The reference numerals are: 1 - switch cabinet, 2 - three winding rectifier transformer, 3 - harmonic canceling reactor, 4 - PWM rectification cabinet. DETAILED DESCRIPTION
[0013] To make the purpose, technical scheme and advantage of the utility model more clear, the following will be combined with the drawings to the each embodiment of the utility model detailedly described. However, the ordinary skilled in the art can understand that in each embodiment of the utility model, in order to make the reader better understanding of the present application and proposed many technical details. However, even if there is no these technical details and based on the various changes and modifications of each embodiment, the technical scheme claimed by each claim of the present application can be realized.
[0014] As Figure 1 The utility model discloses a kind of high-performance rectification power supply example, by a switch cabinet 1, a three winding rectifier transformer 2, a harmonic canceling reactor 3 and a PWM rectification cabinet 4 are composed. PWM switching frequency subharmonic current, transformer vice side circulation when the large capacity rectification output is effectively suppressed, guarantee system operation stability.
[0015] The output end of the switch cabinet 1 is connected with the input end of the three-winding rectifier transformer 2, the output end of the three-winding rectifier transformer 2 is connected with the input end of the harmonic elimination reactor 3, the output end of the harmonic elimination reactor 3 is connected with the input end of the PWM rectifier cabinet 4, and the output end of the PWM rectifier cabinet 4 is connected in series or parallel according to the output voltage requirement and then outputs; the rectifier output DC voltage is controllable, the DC voltage ripple is small, the AC network side harmonic is reduced, and the AC network side power factor is improved.
[0016] The two secondary sides of the three-winding rectifier transformer 2 are in the same phase, and the three-winding rectifier transformer 2, the harmonic elimination reactor 3 and the PWM rectifier cabinet 4 are sequentially connected; the PWM switching frequency subharmonic current and the transformer secondary side circulating current during large-capacity rectifier output can be effectively suppressed, and the system operation stability is ensured. The harmonic elimination reactor 3 is coupled by the first secondary side reactor of the rectifier transformer and the second secondary side reactor of the rectifier transformer; the first secondary side reactor of the rectifier transformer and the second secondary side reactor of the rectifier transformer each have a set of three-phase windings, the two sets of windings share a core magnetic circuit, have the same structure and the same name end on the same side; the fundamental current magnetic flux of the two transformer secondary side branches is cancelled and the harmonic magnetic flux is strengthened, the magnetic coupling degree of the harmonic elimination reactor is enhanced, and the volume and weight of the harmonic elimination reactor are effectively reduced.
[0017] Compared with the ordinary PWM rectifier, the utility model has the advantages of small transformer secondary side switching frequency subharmonic current ripple, small circulating current and stable operation when large-capacity output.
[0018] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the utility model, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the utility model.
Claims
1. A high-performance rectifier power supply, characterized by: The invention comprises a switch cabinet (1), a three-winding rectifier transformer (2), a harmonic cancellation reactor (3) and a PWM rectifier cabinet (4); the output end of the switch cabinet (1) is connected to the input end of the three-winding rectifier transformer (2); the two secondary sides of the three-winding rectifier transformer (2) are in phase; the output end of the three-winding rectifier transformer (2) is connected to the input end of the harmonic cancellation reactor (3); the harmonic cancellation reactor (3) is composed of a reactor on the first secondary side and a reactor on the second secondary side of the three-winding rectifier transformer (2) coupled together; the output end of the harmonic cancellation reactor (3) is connected to the input end of the PWM rectifier cabinet (4); and the output end of the PWM rectifier cabinet (4) is connected in series and parallel for output.
2. A high performance rectifier power supply according to claim 1, characterized in that: The reactors on the first secondary side and the second secondary side of the three-winding rectifier transformer (2) each have a set of three-phase windings, and the two sets of windings have the same structure and a common iron core magnetic circuit.
3. A high-performance rectifier power supply according to claim 2, characterized in that: The two sets of windings have the same-named ends on the same side.