Novel structure of voltage-regulating rectifier transformer

Abstract

The utility model discloses a novel structure of a voltage-regulating rectifier transformer. The transformer comprises an iron core, a rectifier transformer part and a voltage-regulating transformer part, the voltage regulating transformer part is used for regulating voltage to meet various voltage outputs; the rectifier transformer part comprises a high-voltage winding, a filter winding and a low-voltage winding; the high-voltage winding comprises a phase-shifting coil and a basic coil; the phase-shifting coil is arranged at the position closest to the iron core; the filtering winding is arranged between the high-voltage winding and the low-voltage winding and enables harmonic components generated by the rectifying device to be isolated on the low-voltage winding after being filtered; and the regulating transformer part is connected with the high-voltage winding. The technical problems that the influence of harmonic waves generated by a rectifying device on the transformer cannot be eliminated and the capacity of the rectifying transformer is limited in the prior art are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of voltage-regulating rectifier transformers, in particular to a novel structure of a voltage-regulating rectifier transformer. Background Art

[0002] Generally, the voltage regulating rectifier transformer includes the rectifier transformer part and the voltage regulating transformer part. The unidirectional conductive effect of the rectifier device causes the distortion of the alternating magnetic field waveform of the rectifier transformer. Even if the power supply grid is an ideal sine wave, the current taken by the rectifier device from the AC grid is also non-sinusoidal. In addition to being input into the rectifier device, the flow direction of these non-sinusoidal currents is also fed back to the grid. In order to effectively eliminate or reduce the pollution of harmonics to the grid, measures to suppress and eliminate harmonics must be taken in accordance with relevant requirements.

[0003] The general method is as follows:

[0004] 1. By shifting the phase of the high-voltage side of the rectifier transformer (either the high-voltage side of the modulator or the high-voltage side of the transformer), this method can basically eliminate low-order harmonics with large amplitudes. However, due to the limitations of the number of rectifier phases, capacity, and harmonic current, the capacity of a single rectifier transformer itself cannot be too large.

[0005] 2. Set filter coil #1 in the voltage regulating transformer part and connect it to the filter reactor. Filter coils Am, Bm, Cm are connected to the filter reactor. Filter coil #1 is placed in the voltage regulating transformer part. Filter coil #1 is placed closest to the transformer core. High-voltage coil #2 and voltage regulating coil #3 are behind the filter coil. Figure 1 , Figure 2 As shown. Since the filter coil is arranged in the voltage regulating transformer part, this solution can shield the influence of the harmonics generated by the rectifier on the power grid, but it does not eliminate the influence of the harmonics generated by the rectifier on the transformer. Utility Model Content

[0006] The utility model aims to provide a novel structure of a voltage regulating rectifier transformer to solve the technical problem that the influence of harmonics generated by a rectifier device on the transformer cannot be eliminated and the capacity of the rectifier transformer itself is limited.

[0007] The technical solution adopted by the utility model is as follows: a new type of voltage-regulating rectifier transformer structure, the transformer includes an iron core, a rectifier transformer part and a voltage-regulating transformer part; the voltage-regulating transformer part is used for voltage regulation to meet various voltage outputs; the rectifier transformer part includes a high-voltage winding, a filter winding and a low-voltage winding; the high-voltage winding includes a phase-shifting coil and a basic coil; the phase-shifting coil is placed closest to the iron core; the filter winding is arranged between the high-voltage winding and the low-voltage winding, and the harmonic components generated by the rectifier device are filtered and isolated on the low-voltage winding; the voltage-regulating transformer part is connected to the high-voltage winding.

[0008] Particularly, the voltage regulating transformer part includes an A-phase voltage regulating circuit, a B-phase voltage regulating circuit and a C-phase voltage regulating circuit.

[0009] In particular, there are three basic coils and three phase-shifting coils respectively; the basic coils and the corresponding phase-shifting coils are connected in series as a group of high-voltage winding circuits; the three groups of high-voltage winding circuits are respectively connected to the two ends of the A-phase voltage regulation circuit, the B-phase voltage regulation circuit and the C-phase voltage regulation circuit.

[0010] Particularly, the filter winding comprises a filter coil Am, a filter coil Bm, and a filter coil Cm; and the filter coil Am, the filter coil Bm, and the filter coil Cm are connected in pairs.

[0011] In particular, the phase-shifting coil can be connected to a transformer of a grid-side bus to form a multi-pulse system.

[0012] Particularly, the comprehensive equivalent impedance percentage of the filter winding is close to zero.

[0013] Particularly, the low voltage winding includes 6 low voltage coils.

[0014] In summary, due to the adoption of the above technical solution, the working principle and beneficial effects of the utility model are as follows:

[0015] 1. Since the filter winding of the utility model is arranged in the rectifier transformer, the capacity of the rectifier transformer is not limited by the harmonic content, and there is no need to adopt a structure of multiple devices connected in parallel.

[0016] 2. Since the filter winding is set between the low-voltage winding and the high-voltage winding, and the high-voltage winding includes a phase-shifting coil and a basic coil, the harmonic components generated by the filter winding rectifier are isolated on the low-voltage side and will not pollute the rectifier high-voltage winding and the voltage regulating transformer.

[0017] 3. Setting of filter winding: The utility model can adopt a dual design of ordinary passive filtering scheme and inductive filtering scheme. This scheme ensures that the comprehensive equivalent impedance percentage of the inductive filter winding is close to 0 (ie: │Uz│≤0.1%) during design.

[0018] Equivalent impedance value formula: │Uz│=│Ubd+Ugb-Ugd│;

[0019] Wherein, Ubd: impedance value of inductive filter winding and rectifier low voltage winding;

[0020] Ugb: Impedance value of inductive filter winding and rectifier high voltage (phase shift + basic) coil;

[0021] Ugd: Impedance value of the rectifier high voltage coil (phase shift + basic) and low voltage winding.

[0022] 4. The rectifier transformer adopts a phase-shifting coil setting, and can also form a multi-pulse system with the transformer of the grid-side bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the wiring schematic diagram of the background technology of the utility model;

[0024] Figure 2 This is a winding arrangement diagram of the background technology of the utility model;

[0025] Figure 3 This is a wiring schematic diagram of an embodiment of the utility model;

[0026] Figure 4 This is a winding arrangement diagram of an embodiment of the utility model.

[0027] Markings in the figure: #1. Filter coil; #2. High-voltage coil; #3. Voltage regulating coil; #4. Phase shift coil; #5. Basic coil; #6. Filter coil; #7. Low-voltage coil; 1. Voltage regulating transformer part; 2. Rectifier transformer part; 3. High-voltage winding; 4. Filter winding; 5. Low-voltage winding. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the present utility model embodiment:

[0033] Reference Figure 3 , Figure 4 , the structure of a new type of voltage regulating rectifier transformer in this embodiment, the transformer includes an iron core, a rectifier transformer part 2 and a voltage regulating transformer part 1. The voltage regulating transformer part 1 is used to regulate the voltage to meet various voltage outputs. The rectifier transformer part 2 includes a high-voltage winding 3, a filter winding 4 and a low-voltage winding 5. The high-voltage winding 3 includes a phase-shifting coil #4 and a basic coil #5. The phase-shifting coil #4 is placed closest to the iron core. The filter winding 4 is arranged between the high-voltage winding 3 and the low-voltage winding 5, and the harmonic components generated by the rectifier device are filtered and isolated on the low-voltage winding 5. The voltage regulating transformer part 1 is connected to the high-voltage winding 3.

[0034] The voltage regulating transformer part 1 includes an A-phase voltage regulating circuit, a B-phase voltage regulating circuit and a C-phase voltage regulating circuit.

[0035] There are three basic coils #5 and three phase-shifting coils #4 respectively; the basic coils #5 and the corresponding phase-shifting coils #4 are connected in series as a set of high-voltage winding circuits; the three sets of high-voltage winding circuits are respectively connected to the two ends of the A-phase voltage regulating circuit, the B-phase voltage regulating circuit and the C-phase voltage regulating circuit.

[0036] The filter winding 4 includes three filter coils #6: filter coil Am, filter coil Bm, and filter coil Cm. The filter coils Am, Bm, and Cm are connected in pairs.

[0037] The phase-shifting coil #4 can be connected to the transformer of the grid-side busbar to form a multi-pulse system.

[0038] The percentage of the comprehensive equivalent impedance of the filter winding is close to 0. During the design, ensure that the percentage of the comprehensive equivalent impedance of the inductive filter winding is close to 0 (i.e.: │Uz│≤0.1%).

[0039] Equivalent impedance value formula: │Uz│=│Ubd+Ugb-Ugd│;

[0040] Wherein, Ubd: impedance value of inductive filter winding and rectifier low voltage winding;

[0041] Ugb: Impedance value of inductive filter winding and rectifier high voltage (phase shift + basic) coil;

[0042] Ugd: Impedance value of the rectifier high voltage coil (phase shift + basic) and low voltage winding.

[0043] The low voltage winding includes 6 low voltage coils #7.

[0044] The working principle of the utility model is as follows:

[0045] Since the filter winding of the utility model is arranged in the rectifier transformer, the capacity of the rectifier transformer is not limited by the harmonic content, and there is no need to adopt a structure of multiple devices in parallel. Since the filter winding is arranged between the low-voltage winding and the high-voltage winding. The high-voltage winding includes a phase-shifting coil and a basic coil. Since the harmonic components generated by the filter winding rectifier are isolated on the low-voltage side, they will not pollute the rectifier high-voltage winding and the voltage regulating transformer part.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel structure of a voltage regulating rectifier transformer, the transformer comprises an iron core, a rectifier transformer part and a voltage regulating transformer part; the characteristics are: The voltage regulating transformer part is used for regulating voltage to meet various voltage outputs; the rectifier transformer part includes a high-voltage winding, a filter winding and a low-voltage winding; the high-voltage winding includes a phase-shifting coil and a basic coil; the phase-shifting coil is placed closest to the iron core; the filter winding is arranged between the high-voltage winding and the low-voltage winding, and the harmonic components generated by the rectifier device are filtered and isolated on the low-voltage winding; the voltage regulating transformer part is connected to the high-voltage winding.

2. The structure of a novel voltage regulating rectifier transformer according to claim 1 is characterized in that: The voltage regulating transformer part includes an A-phase voltage regulating circuit, a B-phase voltage regulating circuit and a C-phase voltage regulating circuit.

3. The structure of a novel voltage regulating rectifier transformer according to claim 2 is characterized in that: There are three basic coils and three phase-shifting coils respectively; the basic coils and the corresponding phase-shifting coils are connected in series as a set of high-voltage winding circuits; the three sets of high-voltage winding circuits are respectively connected to the two ends of the A-phase voltage regulation circuit, the B-phase voltage regulation circuit and the C-phase voltage regulation circuit.

4. The structure of a novel voltage regulating rectifier transformer according to claim 1 is characterized in that: The filter winding includes a filter coil Am, a filter coil Bm, and a filter coil Cm; the filter coil Am, the filter coil Bm, and the filter coil Cm are connected in pairs.

5. The structure of a novel voltage regulating rectifier transformer according to claim 1 is characterized in that: The phase-shifting coil can be connected to a transformer of a grid-side busbar to form a multi-pulse system.

6. The structure of a novel voltage regulating rectifier transformer according to claim 1 is characterized in that: The comprehensive equivalent impedance percentage of the filter winding is close to zero.

7. The structure of a novel voltage regulating rectifier transformer according to claim 1 is characterized in that: The low voltage winding includes 6 low voltage coils.

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