CN209896788U - Ultrahigh-voltage phase modulator applied to ultrahigh-voltage converter station - Google Patents

Abstract

The utility model discloses a be applied to superhigh pressure phase modulation machine among special high voltage current conversion station relates to motor technical field. The utility model discloses a crosslinked polyethylene cable replaces traditional shaping line stick to make stator winding for large-scale phase modulation machine stator winding terminal voltage can design for equal with the converter station alternating current busbar voltage, thereby make phase modulation machine and converter station alternating current busbar lug connection, save step up transformer and become probably, can show the area that reduces the phase modulation machine system at extra-high voltage converter station, reduce phase modulation machine system cost, improve the overall reliability of phase modulation machine system.

Description

Ultrahigh-voltage phase modulator applied to ultrahigh-voltage converter station

Technical Field

The utility model relates to an alternating current motor technical field, more specifically say and relate to a be applied to superhigh pressure phase modulation machine among special high voltage current conversion station.

Background

With the rapid development of economy in China, the problem of geographic distribution imbalance between a load center and a power supply base, particularly between a clean energy production base, is more obvious. In order to improve the consumption capacity of clean energy and promote the sustainable development of the power industry, China builds a plurality of extra-high voltage long-distance direct current transmission projects for transmitting clean power in the west and north to load centers in east China and south China.

The extra-high voltage direct current transmission project is connected with an alternating current power grid through a direct current converter station, and alternating current-direct current conversion of electric energy is realized by utilizing a converter. However, for the receiving-end converter station, the low voltage problem caused by the failure of multi-circuit direct current commutation is more prominent; for the sending-end converter station, there is a risk that the dc blocking causes overvoltage in the ac system. Therefore, it is objectively required that a large-scale direct current transmission line must be matched with a large-scale alternating current dynamic reactive power compensation device. Due to the requirements of the converter station on the instantaneous response characteristic and the dynamic reactive power capacity of the dynamic reactive power compensation device, the common power electronic reactive power compensation devices such as SVC and STATCOM cannot adapt to the requirements.

Based on the consideration of economy and feasibility, the China national grid company proposes to adopt a large phase modulator as reactive compensation equipment of the extra-high voltage direct current converter station, can meet the requirement of the extra-high voltage converter station on dynamic reactive compensation capability, and can provide steady-state reactive support at the same time. The large phase modulator system is arranged in the converter station and mainly comprises a large phase modulator, a step-up transformer, a variable frequency starting system, a self-shunt excitation static excitation system and other equipment, wherein the high-voltage side of the step-up transformer is directly connected with an alternating current bus of the converter station. The large phase modifier adopts a hidden-stage solid rotor motor structure similar to a turbonator, the capacity is 300Mvar, and the rated voltage is 20 kV. In the prior art, the voltage of the stator machine terminal is difficult to exceed 15-30kV, and the voltage level of the high-voltage alternating-current bus of the converter station is up to 500-1000kV, so that the connection of a large phase modifier and the alternating-current bus of the converter station must be realized through a step-up transformer.

The leakage inductance of the step-up transformer increases the transient inductance and the super-transient inductance of the phase modulator system, and weakens the dynamic reactive output capability of the phase modulator system. The boosting requirement causes the current of the motor stator to be far larger than the current actually flowing into a power grid, and the heat dissipation requirement of the motor is improved. The step-up transformer and the attached equipment increase the occupied space requirement of the whole set of large phase modulator system, improve the cost and influence the overall economic benefit.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect that exists among the above-mentioned prior art and not enough, this application provides a be applied to the superhigh pressure phase modulator in special high voltage current conversion station, the utility model discloses an invention aim at solve among the prior art because of the phase modulator must just can be connected with current conversion station alternating current bus through step up transformer and arouse the problem, the utility model discloses a superhigh pressure phase modulator adopts the crosslinked polyethylene cable to replace traditional shaping line stick to make stator winding for large-scale phase modulator stator winding terminal voltage can be designed to be equivalent for with current conversion station alternating current bus voltage, thereby makes phase modulator and current conversion station alternating current bus lug connection, saves step up transformer and becomes probably, can show the area that reduces the phase modulator system at special high voltage current conversion station, reduces phase modulator system cost, improves the overall reliability of phase modulator system.

In order to solve the problems existing in the prior art, the method is realized by the following technical scheme:

the utility model provides an be applied to extra-high voltage phase modulation machine among extra-high voltage converter station, includes stator and rotor, the stator includes stator core and stator winding, the rotor includes rotor core and rotor excitation winding, its characterized in that: the stator winding is made of cross-linked polyethylene cables to form a symmetrical Y-connection three-phase stator winding, 2M taps are drawn out of each phase of winding according to equal and symmetrical positions to form M branches, the non-neutral point tap of the branch closest to a neutral point serves as an excitation port, and the other taps form a stator winding wiring mode to form a stator winding outlet end which serves as a power port for connecting the stator winding with a power system.

Further, as a preferable technical solution of the present invention, in the stator winding, a cross-linked polyethylene cable having a larger effective conductor cross-sectional area than that of other coils is used for a coil between the excitation port and the neutral point.

And all taps in the stator winding are connected into the stator winding wiring cabinet, and the connection between the taps is realized according to the wiring mode of the stator winding through a connecting switch and a control circuit arranged in the stator winding wiring cabinet.

In the starting process of the phase modulator, M branches of each phase of a stator winding are in a parallel state; when the starting process enters the interruption process, the M branches of each phase winding are changed into a serial state from a parallel state through a connecting switch in the stator winding wiring cabinet.

The stator core is supported by silicon steel sheet lamination in an overlying mode, a stator groove is formed in the stator core, and the groove type of the stator groove is an open square groove with an arc-shaped positioning hole.

The stator winding adopts a distributed short-distance winding structure or a concentric winding structure.

The rotor core is of a non-salient pole type and is formed by forging solid steel, a rotor slot is formed in the rotor core, the slot type of the rotor slot is an open slot, and a rotor slot wedge made of a conductive material is adopted in the slot opening of the rotor slot so as to fix the rotor excitation winding in the slot; the rotor excitation winding adopts a concentric winding structure.

The rotor also comprises a rotor slot wedge squirrel cage which is composed of all rotor slot wedges and two slot wedge cage end rings, wherein the slot wedge cage end rings are circular rings made of metal conducting materials, and the two slot wedge cage end rings are respectively welded with all the rotor slot wedges on two sides of the rotor, so that the rotor slot wedge squirrel cage is formed.

Compared with the prior art, the beneficial technical effects brought by the application are shown in that:

1. the phase modulator of the application adopts the cross-linked polyethylene cable to replace a traditional forming coil bar to manufacture the stator winding, so that the voltage of the stator winding of the large phase modulator can be designed to be equal to the voltage of an alternating current bus of a converter station, the phase modulator is directly connected with the alternating current bus of the converter station, a step-up transformer is omitted, the occupied area of the phase modulator system in an extra-high voltage converter station can be obviously reduced, the system cost of the phase modulator is reduced, and the overall reliability of the phase modulator system is improved.

2. Under the same capacity, the running current of the ultrahigh-voltage phase modulator is smaller than that of a large phase modulator in the prior art, and the copper consumption of a stator winding can be reduced. Simultaneously, the requirement of the ultrahigh-pressure phase modulator to a stator cooling system is lower than that of the existing large-scale phase modulator, so that the ultrahigh-pressure phase modulator has better environmental adaptability, and the maintenance requirement and the maintenance cost are correspondingly reduced.

3. The ultrahigh voltage phase modulator is applied to an ultrahigh voltage converter station, and can be directly connected with an alternating current bus of the converter station when forming a phase modulator system, so that a step-up transformer can be omitted; after a step-up transformer is omitted, the transient and super-transient equivalent series inductance of the phase modulator branch is remarkably reduced, the dynamic reactive power output capability of the FM estimation system can be improved, the operating characteristic of the phase modulator system is improved, and more powerful instantaneous reactive power support capability is provided for an extra-high voltage power transmission system.

4. In the stator winding, 2M taps are drawn out from each phase winding at equal and symmetrical positions to form M branches, wherein the non-neutral point tap of the branch closest to the neutral point is used as an excitation port to realize a self-shunt excitation function. The other taps are connected by different combination methods under different operation conditions to form a stator winding wiring mode, and the outlet end of the formed stator winding, namely the port of the stator winding connected with the power system, is used as a power port. In order to ensure the consistency of the current density of each conductor, a cross-linked polyethylene cable with a larger cross-sectional area than the effective conductors of other coils is adopted for the coil between the excitation port and the neutral point, and the branch is called as an excitation branch in the patent. And the tap number M is optimally selected according to the number of wires in each groove, the rated voltage and the voltage-resistant grade of the variable-frequency starting equipment, and the comprehensive economy and reliability.

5. The rotor is composed of a rotor iron core, a rotor excitation winding and a rotor slot wedge squirrel cage, wherein the rotor iron core is of a non-salient pole type and is made of solid steel through forging. The rotor core is provided with a rotor slot, the slot type of the rotor slot is an open slot so as to facilitate the coil inserting of the rotor winding, the slot opening of the rotor slot adopts a rotor slot wedge made of a conductive material to fix the rotor winding in the slot, and the rotor winding adopts a concentric winding structure. The rotor slot wedge squirrel cage is composed of all rotor slot wedges and two slot wedge cage end rings, the slot wedge cage end rings are circular rings made of metal conducting materials, and the two slot wedge cage end rings are respectively welded with all rotor slot wedges on two sides of a rotor, so that the rotor slot wedge squirrel cage is formed. The rotor slot wedge squirrel cage acts as a damping winding.

Drawings

Fig. 1 is a schematic block diagram of an ultra-high pressure phase modulator provided by the present invention;

fig. 2 is a schematic block diagram of an ultra-high voltage phase modulator applied in a phase modulator system;

fig. 3 is a schematic structural diagram of a module of an ultra-high pressure phase modulator applied in a phase modulator system;

fig. 4 is a schematic axial cross-sectional view of a rotor core of an ultra-high pressure phase modulator provided by the present invention;

fig. 5 is an axial cross-sectional schematic view of a stator core of an ultra-high voltage phase modulator provided by the present invention;

fig. 6 is a schematic diagram of stator winding slot type and in-slot cable distribution provided by the present invention;

fig. 7 is a schematic drawing of a stator winding tap provided by the present invention;

fig. 8 is a schematic diagram comparing the conventional operation and starting connection modes of the stator winding provided by the present invention;

reference numerals: 1. the system comprises an ultrahigh voltage phase modulator, a self-shunt excitation static excitation system, a frequency conversion starting system, a starting control module, a 5, an alternating current bus of an ultrahigh voltage converter station, a 6, an outlet high voltage circuit breaker, 1-1, a stator iron core, 1-2, a stator winding, 1-3 rotor iron cores, 1-4 rotor excitation windings, 1-1-1, a stator slot, 1-2-1, an excitation port, 1-2-2, a power port, 1-2, 1-3-1, a rotor slot, 1-5, a rotor, 1-6, a stator, 1-7, a stator winding connection cabinet, 1-8, a power branch cable, 1-9, an excitation branch cable, 1-10, a cable insulator, 1-11, a cable conductor, 1-12, a transformer, a, The system comprises a neutral point, 1-13 excitation port taps, 1-14 power port taps, 7 a unit protection system and a fault recording system, 8 a breaker grid-connected synchronous control system, 9 a unified control system and an engineer station.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The utility model discloses be applied to special high voltage direct current converter station, its effect provides developments and steady state reactive power support and reactive power compensation.

This embodiment provides one and will the utility model discloses an extra-high voltage phase modulation machine is used and special high voltage direct current convertor station's phase modulation machine system. Fig. 2 shows a schematic block diagram of an ultra-high voltage phase modulator system provided in this embodiment, which is detailed as follows:

the ultrahigh-voltage phase modulator system comprises an ultrahigh-voltage phase modulator 1, a self-shunt excitation static excitation system 2, a variable-frequency starting system 3, a starting control module 4, an ultrahigh-voltage converter station alternating-current bus 5 and a wire outlet end high-voltage circuit breaker 6; wherein, superhigh pressure phase modulation machine 1 includes: the output port of the three-phase stator winding 1-2 comprises an excitation port 1-2-1 and a power port 1-2-2.

The following is described with reference to specific embodiments:

the specific embodiment illustrates an extra-high voltage phase modulator system with a rated voltage of 500kV and a rated capacity of 300 Mvar. The rated voltage and the rated capacity of the extra-high voltage phase modulator system used by the extra-high voltage converter station may be different from those of the extra-high voltage phase modulator system stated in the embodiment, but all the extra-high voltage phase modulator systems can be designed based on the principle of the utility model related to the embodiment.

As shown in fig. 3, the ultrahigh-voltage phase modulator system with a rated voltage of 500kV and a rated capacity of 300Mvar is provided, and the ultrahigh-voltage phase modulator 1 comprises rotors 1-5 and stators 1-6. The rotor 1-5 is composed of a rotor iron core 1-3, a rotor excitation winding 1-4 and a rotor slot wedge squirrel cage. The rotor core 1-3 is made of chromium-nickel alloy electrical steel through forging, the rotor core 1-3 is designed to be of a one-pole non-salient structure, the rotor slot is formed in the rotor core 1-3, the slot index is 45, the number of the coil inserting slots is 32, the rotor slot is of an open square parallel slot structure, a rotor excitation winding is placed in the slot, a rotor slot wedge is driven into the top of the slot, the rotor slot wedge is made of aluminum alloy materials, and conductive materials meeting mechanical strength requirements such as silver-copper alloy materials can also be adopted. The rotor winding adopts a concentric winding structure, and the number of conductors in each slot is 12. The rotor slot wedge squirrel cage is a squirrel cage structure formed by connecting all slot wedges of the rotor at two sides of the rotor through two rotor slot wedge cage end rings in a short circuit mode, and the effect of damping windings is achieved. The excitation winding is connected with a self-shunt excitation static excitation system. The axial cross-sectional structure of the rotor core is shown in fig. 3.

The stator 1-6 is composed of a stator iron core 1-1 and a stator winding. The stator core is formed by laminating and pressing high-quality electrical silicon steel sheets with the thickness of 50 grades. Stator slots are uniformly distributed on the stator core, and the number of the stator slots is 48. The stator winding is made of cross-linked polyethylene cables, and 25 cables are placed in each groove. The stator slot adopts a parallel open slot structure commonly used by large-scale motor stators, but 12 arc-shaped positioning holes are respectively arranged at two sides of the slot for facilitating the fixation of cables, the slot bottom is semicircular, and coils of thicker excitation branches are arranged. The stator winding adopts a concentric winding structure, but also can adopt a chain winding or a whole-distance distributed winding structure, adopts a 60-degree phase belt design, has 6 phase belts and 1 parallel branch, leads out 25 taps, wherein except an excitation branch coil, two coils on the same layer are mutually connected in series to form a branch and lead out the taps, and form two interfaces through a stator winding wiring cabinet 1-7: the stator winding power port 1-2-2 is connected with the stator winding excitation port 1-2-1, wherein the stator winding excitation port 1-2-1 is connected with a specific excitation port tap 1-13, but the excitation port tap 1-13 is connected with other taps in series during normal operation. The axial section structure of the stator core 1-1 is shown in figure 4, the distribution of the stator slot shape and the cables in the slots is shown in figure 5, the leading-out condition of the tap of the A-phase winding is shown in figure 6, and the connection mode of the A-phase winding and the branch circuit in normal operation is shown in figure 7 when the A-phase winding is started. The stator winding power interface is directly connected with a high-voltage alternating current bus 5 of the direct current converter station through an ultrahigh voltage circuit breaker 6. The stator winding excitation port 1-2-1 is connected with the rotor winding through a self-shunt excitation static excitation system 2.

An ultra-high voltage phase modulator system, an ultra-high voltage phase modulator integrated control and protection hardware system shown in fig. 3 is composed of a self-shunt static excitation control system 2, a static variable frequency starting system 3 based on an MMC, a unit protection system and fault recording system 7, an ultra-high voltage circuit breaker grid-connected synchronous control system 8, and a unified control system and engineer station 9.

The distribution of cables in the stator slot shown in fig. 6 is shown as power branch cables 1-8, excitation branch cables 1-9, cable insulation 1-10 and cable conductors 1-11.

In the drawing diagram of the stator phase a winding tap shown in fig. 7, 1 to 13 are excitation port taps, and 1 to 14 are power port taps; in the comparative wiring diagram of the phase a winding of the stator shown in fig. 7, 1-2-1 is an excitation port, 1-2-2 is a power port, and 1-12 is a neutral point.

This embodiment is only the utility model discloses an example, in having different voltage class alternating current generating lines, or in the special high voltage current conversion station of different reactive power compensation ability demands, the rated voltage of superhigh pressure phase-modifier, rated capacity and stator design etc. should be corresponding make the adjustment to satisfy the demand of corresponding engineering condition.

Example 2

As another preferred embodiment of the present invention, referring to the attached fig. 1 of the specification, the present embodiment discloses:

as shown in fig. 1, an extra-high voltage phase modulator applied to an extra-high voltage converter station comprises a stator 1-6 and a rotor 1-5, the stator 1-6 comprises a stator core 1-1 and a stator winding 1-2, the rotor 1-5 comprises a rotor iron core 1-3 and a rotor excitation winding 1-4, the stator winding 1-1 is made of cross-linked polyethylene cables to form a three-phase stator winding with a symmetrical Y-connection method, in the stator winding 1-1, 2M taps are drawn out from each phase of winding according to equal and symmetrical positions to form M branches, with the non-neutral tap of the branch closest to neutral 1-12 being the excitation port 1-2-1, the other taps form a stator winding wiring mode to form an outlet end of the stator winding, namely the outlet end is used as a power port 1-2-2 for connecting the stator winding with a power system. When the ultrahigh voltage phase modulator is applied to a phase modulator system in an ultrahigh voltage direct current converter station, the power port 1-2-2 of the stator winding 1-2 is directly connected with a bus 5 of the ultrahigh voltage converter station through a high voltage circuit breaker 6.

Example 3

As another preferred embodiment of the present invention, referring to fig. 1-8 of the specification, the present embodiment discloses:

as shown in fig. 1, an extra-high voltage phase modulator applied to an extra-high voltage converter station comprises a stator 1-6 and a rotor 1-5, the stator 1-6 comprises a stator core 1-1 and a stator winding 1-2, the rotor 1-5 comprises a rotor iron core 1-3 and a rotor excitation winding 1-4, the stator winding 1-2 is made of cross-linked polyethylene cables to form a three-phase stator winding with a symmetrical Y-connection method, in the stator windings 1-2, 2M taps are drawn out from each phase of winding according to equal and symmetrical positions to form M branches, with the non-neutral tap of the branch closest to neutral 1-12 being the excitation port 1-2-1, the other taps form a stator winding wiring mode to form an outlet end of the stator winding, namely the outlet end is used as a power port 1-2-2 for connecting the stator winding with a power system.

As shown in fig. 6, in the stator winding, a cross-linked polyethylene cable having a larger effective conductor cross-sectional area than that of the other coils is used for the coil between the excitation port 1-2-1 and the neutral point 1-12. In the stator winding 1-2, all taps are connected into the stator winding wiring cabinet 1-7, and the connection between the taps is realized according to the wiring mode of the stator winding 1-2 through a connecting switch and a control circuit arranged in the stator winding wiring cabinet 1-7.

As shown in fig. 8, M branches of each phase of the stator windings 1-2 are in parallel during the phase modulation starting process; when the starting process enters the interruption process, the M branches of each phase winding are changed from the parallel state to the serial state through the connecting switches in the stator winding wiring cabinets 1-7.

Example 4

As another preferred embodiment of the present invention, referring to fig. 1-8 of the specification, the present embodiment discloses:

as shown in fig. 1, an extra-high voltage phase modulator applied to an extra-high voltage converter station comprises a stator 1-6 and a rotor 1-5, the stator 1-6 comprises a stator core 1-1 and a stator winding 1-2, the rotor 1-5 comprises a rotor iron core 1-3 and a rotor excitation winding 1-4, the stator winding 1-2 is made of cross-linked polyethylene cables to form a three-phase stator winding with a symmetrical Y-connection method, in the stator windings 1-2, 2M taps are drawn out from each phase of winding according to equal and symmetrical positions to form M branches, with the non-neutral tap of the branch closest to neutral 1-12 being the excitation port 1-2-1, the other taps form a stator winding wiring mode to form an outlet end of the stator winding, namely the outlet end is used as a power port 1-2-2 for connecting the stator winding with a power system. As shown in fig. 6, in the stator winding, a cross-linked polyethylene cable having a larger effective conductor cross-sectional area than that of the other coils is used for the coil between the excitation port 1-2-1 and the neutral point 1-12. In the stator winding 1-2, all taps are connected into the stator winding wiring cabinet 1-7, and the connection between the taps is realized according to the wiring mode of the stator winding 1-2 through a connecting switch and a control circuit arranged in the stator winding wiring cabinet 1-7.

As shown in fig. 8, M branches of each phase of the stator windings 1-2 are in parallel during the phase modulation starting process; when the starting process enters the interruption process, the M branches of each phase winding are changed from the parallel state to the serial state through the connecting switches in the stator winding wiring cabinets 1-7. As shown in fig. 5, the stator core 1-1 is supported by silicon steel sheet lamination, a stator slot 1-1-1 is formed in the stator core 1-1, and the slot shape of the stator slot 1-1-1 is an open square slot with an arc-shaped positioning hole. The stator winding 1-2 adopts a distributed short-distance winding structure or a concentric winding structure.

As shown in fig. 4, the rotor core 1-3 is a non-salient pole type and is forged from solid steel, the rotor core 1-3 is provided with a rotor slot 1-3-1, the slot type of the rotor slot 1-3-1 is an open slot, and the slot opening of the rotor slot adopts a rotor slot wedge made of a conductive material to fix the rotor excitation winding 1-4 in the slot; the rotor excitation winding adopts a concentric winding structure.

The rotors 1 to 5 further comprise rotor slot wedge squirrel cages, each rotor slot wedge squirrel cage is composed of all rotor slot wedges and two slot wedge cage end rings, each slot wedge cage end ring is a circular ring made of a metal conducting material, and the two slot wedge cage end rings are respectively welded with all the rotor slot wedges on two sides of the rotor, so that the rotor slot wedge squirrel cage is formed.

The above-mentioned embodiment is only the utility model discloses a partial example of listing, in having different voltage class alternating current generating line, or in the special high voltage current conversion station of different reactive compensation ability demands, the rated voltage of superhigh pressure phase modifier, rated capacity and stator design etc. should correspondingly make the adjustment to satisfy the demand of corresponding engineering condition.

Claims (8)

1. An extra-high voltage phase modulator applied to an extra-high voltage converter station comprises a stator (1-6) and a rotor (1-5), wherein the stator (1-6) comprises a stator core (1-1) and a stator winding (1-2), the rotor (1-5) comprises a rotor core (1-3) and a rotor excitation winding (1-4), and the extra-high voltage phase modulator is characterized in that: the stator winding (1-2) is made of cross-linked polyethylene cables to form a three-phase stator winding in a symmetrical Y-connection method, 2M taps are drawn out from each phase of winding in the stator winding (1-2) according to equal and symmetrical positions to form M branches, the non-neutral point tap of the branch closest to the neutral point (1-12) is used as an excitation port (1-2-1), and the other taps form a stator winding connection mode to form a wire outlet end of the stator winding, namely a power port (1-2-2) for connecting the stator winding with a power system.

2. The extra-high voltage phase modulator applied to an extra-high voltage converter station according to claim 1, wherein: in the stator winding (1-2), a coil between the excitation port (1-2-1) and the neutral point (1-12) adopts a cross-linked polyethylene cable with the effective conductor sectional area larger than that of other coils.

3. An extra-high voltage phase modulator applied to an extra-high voltage converter station according to claim 1 or 2, wherein: in the stator winding (1-2), all taps are connected into the stator winding wiring cabinet (1-7), and the connection between the taps is realized according to the wiring mode of the stator winding through a connecting switch and a control circuit arranged in the stator winding wiring cabinet (1-7).

4. The extra-high voltage phase modulator applied to the extra-high voltage converter station as recited in claim 3, wherein: in the starting process of the phase modulator (1), M branches of each phase of the stator winding (1-2) are in a parallel state; when the starting process enters the interruption process, the M branches of each phase winding are changed into a serial state from a parallel state through the connecting switches in the stator winding wiring cabinets (1-7).

5. The extra-high voltage phase modulator applied to an extra-high voltage converter station according to claim 1, wherein: the stator core (1-1) is supported by silicon steel sheet lamination in an overlying mode, the stator core (1-1) is provided with a stator groove (1-1-1), and the groove type of the stator groove (1-1-1) is an open square groove with an arc-shaped positioning hole.

6. An extra-high voltage phase modulator applied to an extra-high voltage converter station according to claim 1, 2, 4 or 5, wherein: the stator windings (1-2) adopt a distributed short-distance winding structure or a concentric winding structure.

7. The extra-high voltage phase modulator applied to an extra-high voltage converter station according to claim 1, wherein: the rotor core (1-3) is of a non-salient pole type and is formed by forging solid steel, a rotor slot (1-3-1) is formed in the rotor core (1-3), the slot type of the rotor slot (1-3-1) is an open slot, and a rotor slot wedge made of a conductive material is adopted in a slot opening of the rotor slot (1-3-1) so as to fix the rotor excitation winding (1-4) in the slot; the rotor excitation windings (1-4) adopt a concentric winding structure.

8. The extra-high voltage phase modulator applied to an extra-high voltage converter station as recited in claim 7, wherein: the rotor (1-5) further comprises a rotor slot wedge squirrel cage, wherein the rotor slot wedge squirrel cage is composed of all rotor slot wedges and two slot wedge cage end rings, the slot wedge cage end rings are circular rings made of metal conducting materials, and the two slot wedge cage end rings are respectively welded with all the rotor slot wedges on two sides of the rotor, so that the rotor slot wedge squirrel cage is formed.

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