CN209963849U - Ultrahigh-voltage phase modulator system applied to ultrahigh-voltage converter station - Google Patents
Ultrahigh-voltage phase modulator system applied to ultrahigh-voltage converter station Download PDFInfo
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- CN209963849U CN209963849U CN201920739484.XU CN201920739484U CN209963849U CN 209963849 U CN209963849 U CN 209963849U CN 201920739484 U CN201920739484 U CN 201920739484U CN 209963849 U CN209963849 U CN 209963849U
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a be applied to superhigh pressure phase modulation machine system in special high voltage current conversion station relates to alternating current motor and system technical field. The utility model comprises an ultrahigh pressure phase modulator, a self-shunt excitation static excitation system and a variable frequency starting system; the stator winding of the ultrahigh voltage phase modulator is made of a cross-linked polyethylene cable to form a symmetrical Y-connection three-phase stator winding, 2M taps are drawn out from each phase winding according to equal and symmetrical positions to form M branches, the non-neutral point tap of the branch closest to a neutral point is used as an excitation port, the rest taps are used as power ports for connecting the stator winding with a power system, and the power ports of the stator winding are directly connected with a bus of the ultrahigh voltage converter station through a high-voltage circuit breaker. The utility model discloses the phase modulation machine is direct to be connected with the current conversion station generating line, no longer needs step up transformer, can show the area that reduces the phase modulation machine system at extra-high voltage current conversion station, reduces phase modulation machine system cost, improves the overall reliability of phase modulation machine system.
Description
Technical Field
The utility model relates to an alternating current motor and system technical field, more specifically say and relate to an be applied to superhigh pressure phase modifier system 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 modulation machine system in special high voltage current conversion station, the utility model discloses an invention aim at solves the technical problem that step up transformer brought among the prior art, the utility model discloses an among the phase modulation machine system, the phase modulation machine is direct to be connected with the current conversion station generating line, no longer needs step up transformer, can show the area that reduces the phase modulation machine system at special high voltage current conversion station, reduces phase modulation machine system cost, improves the whole reliability of phase modulation machine system.
In order to solve the problems existing in the prior art, the method is realized by the following technical scheme:
an ultrahigh-voltage phase modulator system applied to an ultrahigh-voltage converter station comprises an ultrahigh-voltage phase modulator, a self-shunt excitation static excitation system and a variable-frequency starting system; the ultrahigh pressure phase modulator comprises a stator and a rotor, wherein the stator comprises a stator core and a stator winding, and the rotor comprises a rotor core and an excitation winding, and is 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 is used as an excitation port, and the other taps form a stator winding wiring mode to form a stator winding outlet end which is used as a power port for connecting the stator winding with a power system; the self-shunt excitation static excitation system comprises an excitation transformer, a controllable thyristor rectifier and an excitation controller, wherein one side of the excitation transformer is connected with an excitation port led out by the stator winding, one side of the excitation transformer is connected with the input end of the controllable thyristor rectifier, the output end of the controllable thyristor rectifier is connected with the excitation winding, and the excitation controller is used for controlling the on and off of the controllable thyristor rectifier; and a power port of the stator winding is directly connected with a bus of the extra-high voltage converter station through a high-voltage circuit breaker.
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.
The variable-frequency starting system adopts a modular multilevel converter, when the ultrahigh-voltage phase modulator is started, the output end of the variable-frequency starting system is connected with a stator winding of the ultrahigh-voltage phase modulator, and the input end of the variable-frequency starting system is connected with an alternating current bus of the ultrahigh-voltage converter station.
In the starting process, M branches of each phase of the stator winding are in a parallel state; when the starting process enters the interruption process, except that the variable-frequency starting system needs to be switched off, M branches of each phase of 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. in the ultrahigh-voltage phase modulator system, the phase modulator can be directly connected with an alternating-current bus of the converter station, a step-up transformer is not needed any more, the occupied area of the phase modulator system in the ultrahigh-voltage converter station can be obviously reduced, the cost of the phase modulator system is reduced, and the overall reliability of the phase modulator system is improved. In the application, the stator winding is manufactured by adopting the crosslinked polyethylene cable to replace a traditional molding coil bar, so that the voltage of the stator winding end of the large phase modulator can be designed to be equal to the voltage of an alternating current bus of a converter station, and the phase modulator is directly connected with the alternating current bus of the converter station, and a step-up transformer is omitted.
2. Under the same capacity, the running current of the ultrahigh-voltage phase modulator is far smaller than that of a large phase modulator, and the copper consumption of a stator winding can be reduced. Meanwhile, the requirement of the ultrahigh pressure phase modulator on a stator heat dissipation system is lower than that of a large 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. After a step-up transformer is omitted, transient and super-transient equivalent series inductance of a phase modulator branch is remarkably reduced, the dynamic reactive output capability of a phase modulator system can be improved, the operating characteristic of the phase modulator system is improved, and more powerful transient reactive 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.
6. The utility model provides a frequency conversion starting system adopts many level of modularization transverter (MMC), when the superhigh pressure phase modulation machine starts, the output of frequency conversion starting system is connected with the stator winding of superhigh pressure phase modulation machine, and the input is connected with special high voltage current conversion station alternating current generating line. In the starting process, M branches of each phase of the stator winding are in a parallel connection state, so that the voltage requirement on the variable-frequency starting system is reduced, and the cost of the variable-frequency starting system is reduced. When the starting process enters the interruption process, except that the variable-frequency starting system needs to be switched, the M branches of each phase of winding are changed into a series state from a parallel state through the switching in the stator winding wiring cabinet. The switching of the switch, namely the switching of the stator windings in the serial connection state and the parallel connection state is realized, and is completed by a connecting switch in the stator winding wiring cabinet.
Drawings
Fig. 1 is a schematic block diagram of an ultra-high pressure phase modulator system provided by the present invention;
fig. 2 is a schematic diagram of a module structure of an ultra-high pressure phase modulation system according to an embodiment of the present invention;
fig. 3 is a schematic axial cross-sectional view of a rotor core according to an embodiment of the present invention;
fig. 4 is an axial sectional view of a stator core provided in an embodiment of the present invention;
fig. 5 is a schematic diagram of stator winding slot shapes and cable distribution in slots according to an embodiment of the present invention;
fig. 6 is a schematic drawing of a stator winding tap provided by an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a comparison of the conventional operation and starting connection modes of the stator winding according to the embodiment of the present invention;
reference numerals: 1. an ultrahigh voltage phase modulator, 2, a self-shunt excitation static excitation system, 3, a variable frequency starting system, 4, a starting control module, 5, an alternating current bus of an ultrahigh voltage converter station, 6, an outlet end high voltage circuit breaker, 1-1, a stator core, 1-2, a stator winding, 1-3 rotor cores, 1-4 rotor excitation windings, 1-2-1, an excitation port, 1-2-2, a power port, 1-2-2, 1-5, a rotor, 1-6, a stator, 1-7, a stator winding assembly wiring cabinet, 1-8, a power branch cable, 1-9, an excitation branch cable, 1-10, cable insulation, 1-11, a cable conductor, 1-12, a neutral point, 1-13, an excitation port tap, 1-14 and a power port tap, 7. the system comprises a unit protection system, a fault recording system, 8 a circuit 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.
The present embodiment provides an ultra high pressure phase modulator system. Fig. 1 shows a schematic block diagram of an ultra-high pressure phase modulation system provided by an embodiment of the present invention, 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. 2, the ultrahigh-voltage phase modulator system with a rated voltage of 500kV and a rated capacity of 300Mvar is characterized in that 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. 2 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. 5 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. 6, 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, the present embodiment discloses:
an ultrahigh-voltage phase modulator system applied to an ultrahigh-voltage converter station comprises an ultrahigh-voltage phase modulator 1, a self-shunt excitation static excitation system 2 and a variable-frequency starting system 3; the ultrahigh-voltage phase modulator comprises a stator 1-6 and a rotor 1-5, wherein the stator 1-6 is composed of 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, the stator winding 1-2 is made of a cross-linked polyethylene cable to form a three-phase stator winding adopting a symmetrical Y-connection method, and the cross-linked polyethylene cable is adopted to replace a traditional forming coil bar to manufacture the stator winding, so that the terminal voltage of the stator winding of the large phase modulator can be designed to be equivalent to the AC bus voltage of a converter station, and the direct connection of the phase modulator and the AC bus of the converter station is possible, and a step-up transformer is omitted.
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, wherein a non-neutral point tap of a branch closest to a neutral point is used as an excitation port 1-2-1, and the other taps form a stator winding wiring mode to form an outlet terminal of the stator winding, namely the outlet terminal is used as a power port 1-2-2 for connecting the stator winding with a power system; the self-shunt excitation static excitation system 2 comprises an excitation transformer, a controllable thyristor rectifier and an excitation controller, wherein one side of the excitation transformer is connected with an excitation port 1-2-1 led out by the stator winding, one side of the excitation transformer is connected with the input end of the controllable thyristor rectifier, the output end of the controllable thyristor rectifier is connected with an excitation winding 1-4, and the excitation controller is used for controlling the on and off of the controllable thyristor rectifier; and the power port 1-2-2 of the stator winding 1-2 is directly connected with a bus 5 of the extra-high voltage converter station through a high-voltage circuit breaker 6.
Example 3
As another preferred embodiment of the present application, referring to fig. 1 and 2 of the specification, the present embodiment discloses:
an ultrahigh-voltage phase modulator system applied to an ultrahigh-voltage converter station comprises an ultrahigh-voltage phase modulator 1, a self-shunt excitation static excitation system 2 and a variable-frequency starting system 3; the ultrahigh pressure phase modulator 1 comprises a stator 1-6 and a rotor 1-5, wherein the stator 1-6 is composed of 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 a stator winding outlet end, namely a power port 1-2-2 used for connecting the stator winding with a power system; the self-shunt excitation static excitation system 2 comprises an excitation transformer, a controllable thyristor rectifier and an excitation controller, wherein one side of the excitation transformer is connected with an excitation port 1-2-1 led out by the stator winding, one side of the excitation transformer is connected with the input end of the controllable thyristor rectifier, the output end of the controllable thyristor rectifier is connected with an excitation winding 1-4, and the excitation controller is used for controlling the on and off of the controllable thyristor rectifier; and the power port 1-2-2 of the stator winding is directly connected with an alternating current bus 5 of the extra-high voltage converter station through a high-voltage circuit breaker 6.
Further, as a preferable technical scheme of the present application, in the stator winding 1-2, 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 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 through a connecting switch and a control circuit arranged in the stator winding wiring cabinet 1-7.
The variable-frequency starting system 3 adopts a Modular Multilevel Converter (MMC), when the ultrahigh-voltage phase modulator 1 is started, the output end of the variable-frequency starting system 3 is connected with a stator winding 1-2 of the ultrahigh-voltage phase modulator 1, and the input end of the variable-frequency starting system is connected with an alternating current bus 5 of the ultrahigh-voltage converter station. In the starting process, M branches of each phase of the stator winding 1-2 are in a parallel state; when the starting process enters the interruption process, except that the variable-frequency starting system 3 needs to be switched off, M branches of each phase winding are changed into a series state from a parallel state through connecting switches in the stator winding wiring cabinets 1-7.
The stator core 1-1 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 1-2 adopts a distributed short-distance winding structure or a concentric winding structure. The rotor core 1-3 is of a non-salient pole type and is formed by forging solid steel, a rotor slot is formed in the rotor core 1-3, 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 1-4 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.
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 (9)
1. The ultrahigh-voltage phase modulator system applied to the ultrahigh-voltage converter station comprises an ultrahigh-voltage phase modulator (1), a self-shunt excitation static excitation system (2) and a variable-frequency starting system (3); the ultrahigh-voltage phase modulator (1) comprises a stator (1-6) and a rotor (1-5), wherein the stator (1-6) is composed of a stator core (1-1) and a stator winding (1-2), and the rotor (1-5) comprises a rotor core (1-3) and a rotor excitation winding (1-4), and 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, wherein 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; the self-shunt excitation static excitation system (2) comprises an excitation transformer, a controllable thyristor rectifier and an excitation controller, wherein one side of the excitation transformer is connected with an excitation port (1-2-1) led out by the stator winding, one side of the excitation transformer is connected with the input end of the controllable thyristor rectifier, the output end of the controllable thyristor rectifier is connected with a rotor excitation winding (1-4), and the excitation controller is used for controlling the on and off of the controllable thyristor rectifier; and a power port (1-2-2) of the stator winding is directly connected with an alternating current bus (5) of the extra-high voltage converter station through a high-voltage circuit breaker (6).
2. An extra-high voltage phase modulator system 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. The extra-high voltage phase modulator system applied to the 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. An extra-high voltage phase modulator system applied to an extra-high voltage converter station according to claim 1, wherein: the variable-frequency starting system (3) adopts a modular multilevel converter, when the ultrahigh-voltage phase modifier (1) is started, the output end of the variable-frequency starting system (3) is connected with a stator winding (1-2) of the ultrahigh-voltage phase modifier (1), and the input end of the variable-frequency starting system is connected with an alternating-current bus (5) of the ultrahigh-voltage converter station.
5. An extra-high voltage phase modulator system applied to an extra-high voltage converter station according to claim 3, wherein: in the starting process, M branches of each phase of the stator winding (1-2) are in a parallel state; when the starting process enters the interruption process, except that the variable-frequency starting system needs to be switched off, M branches of each phase winding are changed into a series state from a parallel state through a connecting switch in a stator winding wiring cabinet (1-7).
6. An extra-high voltage phase modulator system 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, a stator groove is formed in the stator core (1-1), and the groove type of the stator groove is an open square groove with an arc-shaped positioning hole.
7. An extra-high voltage phase modulator system applied to an extra-high voltage converter station according to claim 1, wherein: the stator windings (1-2) adopt a distributed short-distance winding structure or a concentric winding structure.
8. An extra-high voltage phase modulator system 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 is formed in the rotor core (1-3), 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 (1-4) in the slot; the rotor excitation windings (1-4) adopt a concentric winding structure.
9. The extra-high voltage phase modulator system applied to the extra-high voltage converter station according to claim 1 or 8, 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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| CN201920739484.XU CN209963849U (en) | 2019-05-22 | 2019-05-22 | Ultrahigh-voltage phase modulator system applied to ultrahigh-voltage converter station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212671A (en) * | 2019-05-22 | 2019-09-06 | 湖北研道特磁科技有限公司 | A kind of super-pressure phase modifier system applied in ultra-high voltage converter station |
| CN113131491A (en) * | 2021-04-25 | 2021-07-16 | 哈尔滨理工大学 | Reactive power regulation method and device for phase modulator rotor in static state |
-
2019
- 2019-05-22 CN CN201920739484.XU patent/CN209963849U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212671A (en) * | 2019-05-22 | 2019-09-06 | 湖北研道特磁科技有限公司 | A kind of super-pressure phase modifier system applied in ultra-high voltage converter station |
| CN113131491A (en) * | 2021-04-25 | 2021-07-16 | 哈尔滨理工大学 | Reactive power regulation method and device for phase modulator rotor in static state |
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