CN110855199B - AC excitation synchronous phase modulator and control method thereof - Google Patents
AC excitation synchronous phase modulator and control method thereof Download PDFInfo
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- CN110855199B CN110855199B CN201911146426.7A CN201911146426A CN110855199B CN 110855199 B CN110855199 B CN 110855199B CN 201911146426 A CN201911146426 A CN 201911146426A CN 110855199 B CN110855199 B CN 110855199B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/38—Self-excitation by current derived from rectification of both output voltage and output current of generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
Abstract
The embodiment of the invention discloses an alternating current excitation synchronous phase modulator, which comprises a variable inertia connecting mechanism, a full-control alternating current excitation converter, a network side converter, a controller and a base, wherein the variable inertia connecting mechanism, the full-control alternating current excitation converter, the network side converter, the controller and the base are connected to a rotor of an alternating current excitation motor, an upper half end cover for mounting the alternating current excitation motor is arranged on the base, two ends of the rotor are mounted on the base through the variable inertia connecting mechanism, a shaft body of the rotor is provided with a fan, the variable inertia connecting mechanism comprises an outer shaft sleeve with an oil inlet and an oil outlet, a turbofan and a roller bearing are arranged inside the outer shaft sleeve, the outer shaft sleeves at two ends of the rotor are connected into a closed circulation loop through a radiating pipe spirally wound on the surface of a stator of the alternating current excitation motor, the radiating pipe is connected with a pressure compensating pump and an oil pump, and the pressure compensating pump is electrically connected with the controller, so The problem of the deviation is solved.
Description
Technical Field
The embodiment of the invention relates to the technical field of alternating-current excitation synchronous motors, in particular to an alternating-current excitation synchronous phase modulator and a control method thereof.
Background
With the adoption of the 'large-scale development and long-distance transmission' pattern of clean energy power generation, a higher proportion of electric energy is transmitted to the middle east region from an external power transmission channel, particularly a direct-current power transmission channel, and a middle east load center power grid is necessarily developed into a typical weak receiving end power grid with a limited local power supply ratio.
The synchronous phase modulator based on the synchronous motor can play a role in adjusting reactive power and supporting local power grid voltage by adjusting the excitation voltage of the synchronous phase modulator. However, ac excited machines are due to their large field winding time constant.
The AC excitation motor is a core electric energy conversion device, and the stator and the rotor of the AC excitation motor are both provided with AC windings with wiring terminals. The controller is used for collecting and processing voltage, current and stator rotating speed signals of the alternating current excitation motor, on one hand, an excitation voltage instruction of the full-control alternating current excitation converter is generated, and on the other hand, a control voltage instruction of the network side converter is generated; the full-control alternating-current excitation converter is used for receiving the excitation voltage instruction and independently adjusting the active power and the reactive power of the alternating-current excitation motor; and the grid-side converter is used for receiving the control voltage instruction and regulating the input active power of the grid-side converter so as to ensure the stability of the voltage of the direct-current bus and further ensure that the fully-controlled alternating-current excitation converter has sufficient excitation control capability.
In the operation process of the alternating-current excitation motor as the core conversion device, the actual operation power and power factor of the alternating-current excitation motor are low, so that the excitation current is reduced, further, the actual values of the excitation voltage instruction of the full-control alternating-current excitation converter and the control voltage instruction of the network side converter by the controller are low, when the current value of the excitation winding is reduced, the current density in the winding is correspondingly reduced, so that the heating value of the excitation winding is reduced, and the heating reaction of the part is the excitation loss in the alternating-current excitation motor.
When the heating values of the stator and the rotor are all reduced, the temperature rise of the whole generator is obviously reduced, under the condition of the same rotating speed and ventilation and the condition of actual operation, the temperature rises of air outlets at two ends of an air cooler of the alternating current excitation motor are different, the actual value of the temperature rise of a main excitation winding of the generator is lower than that of the designed generator, under the condition of reducing the temperature rise of the main excitation winding, the direct current resistance of the excitation winding of the generator is also lower than that under the condition of rated power operation, and under the condition that the excitation current is constant, the excitation voltage is further reduced, namely the actual values of an excitation voltage instruction of a full-control alternating current excitation converter and a control voltage instruction of a network side converter are deviated in the excitation control of the alternating current excitation motor through the full-control alternating current excitation converter.
Disclosure of Invention
Therefore, the embodiment of the invention provides an alternating-current excitation synchronous phase modulator and a control method thereof, and solves the problems of temperature rise and heat dissipation balance offset of an alternating-current excitation motor in the starting process and deviation in excitation control of the alternating-current excitation motor through a fully-controlled alternating-current excitation converter through a variable inertia connecting mechanism connected to a rotor of the alternating-current excitation motor.
In order to achieve the above object, an embodiment of the present invention provides the following:
an AC excitation synchronous phase modulator and a control method thereof comprise a variable inertia connecting mechanism, a full-control AC excitation converter, a network side converter, a controller and a base which are connected to a rotor of an AC excitation motor, wherein the base is provided with an upper half end cover for mounting the AC excitation motor, the full-control AC excitation converter is connected to the AC excitation motor, the network side converter is connected with the full-control AC excitation converter, two ends of the rotor are mounted on the base through the variable inertia connecting mechanism, and a fan is mounted on a shaft body of the rotor positioned at the inner side of the variable inertia connecting mechanism;
the variable inertia connecting mechanism comprises an outer shaft sleeve with an oil inlet and an oil outlet, a turbofan and a roller bearing sleeved on a shaft body of the rotor are arranged in the outer shaft sleeve, the outer shaft sleeves at two ends of the rotor are connected into a closed circulation loop through radiating tubes spirally wound on the surface of a stator of the alternating current excitation motor, a pressure supplementing pump and an oil pump are connected onto the radiating tubes, and the pressure supplementing pump and the oil pump are electrically connected with a controller.
As a preferred scheme of the present invention, the outer shaft sleeve includes a circulation cavity and a clutch cavity separated by a sealing partition plate, and the turbofan is sleeved on a shaft body of the rotor in the circulation cavity, the oil inlet and the oil outlet are respectively installed at the top and the bottom of the circulation cavity, the turbofan is sleeved on the shaft body of the rotor through a piston sleeve, the piston sleeve extends into the clutch cavity through the sealing partition plate, the piston sleeve is connected with a rotating shaft movable key of the rotor located in the clutch cavity, and the piston sleeve moves axially along the shaft body of the rotor under the driving of the driving device.
As a preferable aspect of the present invention, the roller bearing has a bearing outer ring, a roller cage, and a bearing roller embedded in a clutch cavity, the roller bearing has a bearing inner ring protruding from the clutch cavity and in clearance fit with the rotor, and the bearing inner ring of the roller bearing is connected to an inner wall of the clutch cavity through a seal ring.
As a preferred scheme of the present invention, the upper half end cover specifically includes a steam end upper half end cover and a field end upper half end cover, a heat dissipation pipe connected to an oil outlet of an outer shaft sleeve located at the steam end upper half end cover is spirally wound on a stator of the ac excitation motor far away from the steam end upper half end cover, and the other end of the heat dissipation pipe connected to the oil outlet of the outer shaft sleeve located at the steam end upper half end cover is connected to an oil inlet of the outer shaft sleeve located at the field end upper half end cover.
The invention provides a control method of an alternating-current excitation synchronous phase modulator, which comprises the following steps:
s100, acquiring voltage, current and rotating speed signals of the alternating current excitation motor through a sampling module in a controller, and transmitting the signals to a microprocessor for processing, wherein the microprocessor generates an excitation voltage instruction of a full-control alternating current excitation converter and a control voltage instruction of a network side converter according to a processing result;
s200, the microprocessor forms trigger pulses through a pulse module according to the silicon controlled trigger angle calculated by the program, and then converts the trigger pulses into trigger signals for intervention of a pressure compensating pump, an oil pump and a driving device;
s300, after an excitation voltage instruction of the full-control alternating-current excitation converter and an instruction execution period of a control voltage instruction of the grid-side converter are generated, a sampling module conducts secondary sampling on voltage, current and rotating speed signals of the alternating-current excitation motor after the variable inertia connecting mechanism is used as a load, and the secondary sampling signals are transmitted to a PID adjusting circuit through microprocessing.
S400, the PID regulating circuit takes constant reactive power regulation as an outer ring and constant current regulation as an inner ring, the reactive power regulating ring reacts quickly, and the exciting current compensation value of the full-control alternating current exciting converter is regulated, so that the exciting current value is changed, and finally the reactive power is kept constant.
As a preferred scheme of the invention, the controller comprises a microprocessor, a sampling module, a pulse module and a PID adjusting circuit, wherein the sampling module transmits the running state information of a stator and a rotor of the AC excitation motor to the microprocessor, the microprocessor calculates a trigger angle of a controllable silicon according to a program, then a trigger pulse is formed through the pulse module, and then the trigger pulse is converted into a trigger signal for intervention of the pressure compensating pump, the oil pump and the driving device.
As a preferred scheme of the invention, the microprocessor samples the rotor load running state information of the alternating current excitation motor after the pressure compensating pump, the oil pump and the driving device are involved in working again through the sampling module, and adjusts the excitation current of the alternating current excitation motor through the PID adjusting circuit.
As a preferred scheme of the invention, the PID regulating circuit takes constant reactive power regulation as an outer ring and constant current regulation as an inner ring, the reactive power regulating ring reacts quickly to regulate the exciting current compensation value, so that the exciting current value is changed, and finally the reactive power is kept constant.
As a preferable aspect of the present invention, when the variable inertia connecting mechanism does not operate as a load and the excitation power supply voltage changes, the excitation current regulator in the fully-controlled ac excitation converter reacts quickly to maintain the excitation current constant.
As a preferred aspect of the present invention, in S100, the grid-side converter is configured to receive a control voltage command and regulate an input active power of the grid-side converter.
The embodiment of the invention has the following advantages:
the AC excitation synchronous phase modulator is started and synchronized, in the acceleration process, the controller outputs a trigger signal to the oil pump, and the medium oil body in the outer shaft sleeve and the radiating pipe is driven to drive the turbofan through the work of the oil pump, so that the driving force is introduced to the rotor until the rated rotating speed reaches 110%, and the excitation driving process is optimized.
The radiating pipe connected with the oil outlet in the outer sleeve at the upper half end cover of the steam end is spirally wound on the surface of the stator at the lower temperature, and the radiating pipe connected with the oil outlet in the outer sleeve at the upper half end cover of the excitation end is wound on the surface of the stator at the higher temperature, so that the rapid temperature rise in the running process of the stator is ensured, and the temperature rise is kept consistent.
On the other hand, the stator of the air cooling system and the liquid cooling system are used for heat dissipation and heat generation of the rotor, so that the temperature rise of the alternating-current excitation motor is stabilized on the same level, the heating and heat dissipation balance inside the alternating-current excitation motor is prevented from being damaged when the heat generation is increased and the heat dissipation is reduced, and the fault rate of the alternating-current excitation motor is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic structural diagram of an ac excitation synchronous phase modulator according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a variable inertia coupling mechanism according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of an outer sleeve according to an embodiment of the present invention.
In the figure:
1-a base; 2-upper half end cap; 3-alternating current excitation motor; 4-a rotor; 5-variable inertia connecting mechanism; 6-a fan; 7-an oil inlet; 8-oil outlet; 9-outer shaft sleeve; 10-a turbofan; 11-roller bearings; 12-radiating pipes; 13-a pressure compensating pump; 14-an oil pump; 15-a piston sleeve; 16-a stator;
901-sealing the separator; 902-a circulation chamber; 903-clutch cavity;
201-vapor end upper half end cover; 202-exciter end upper half-cap.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, 2 and 3, the present invention provides an ac excitation synchronous phase modulator, which includes a variable inertia connection mechanism 5 connected to a rotor 4 of an ac excitation motor 3, a fully-controlled ac excitation converter, a grid-side converter, a controller and a base 1, wherein the base 1 is provided with an upper half end cover 2 for mounting the ac excitation motor, the fully-controlled ac excitation converter is connected to the ac excitation motor 3, and the grid-side converter is connected to the fully-controlled ac excitation converter.
The ac excitation motor 3 is a core power conversion device, and the stator 16 and the rotor 3 are both ac windings equipped with terminals. The controller is used for collecting and processing voltage, current and stator rotating speed signals of the alternating current excitation motor 3, on one hand, an excitation voltage instruction of the full-control alternating current excitation converter is generated, and on the other hand, a control voltage instruction of the network side converter is generated; the full-control alternating-current excitation converter is used for receiving the excitation voltage instruction and independently adjusting the active power and the reactive power of the alternating-current excitation motor; and the grid-side converter is used for receiving the control voltage instruction and regulating the input active power of the grid-side converter so as to ensure the stability of the voltage of the direct-current bus and further ensure that the fully-controlled alternating-current excitation converter has sufficient excitation control capability.
In the operation process of the ac excitation motor 3 as the core conversion device, the actual operating power and power factor of the ac excitation motor 3 are low, which results in a decrease in excitation current, so that the actual values of the excitation voltage command of the fully-controlled ac excitation converter and the control voltage command of the grid-side converter by the controller are low, and when the current value of the excitation winding is decreased, the current density in the winding is also correspondingly decreased, which results in a decrease in the heating value of the excitation winding, and this part of the heating reaction is the excitation loss in the ac excitation motor.
When the heating values of the stator and the rotor are all reduced, the temperature rise of the whole generator is obviously reduced, under the condition of the same rotating speed and ventilation and in the actual operation, the temperature rises of air outlets at two ends of an air cooler of the alternating current excitation motor 3 are different, the actual value of the temperature rise of a main excitation winding of the generator is lower than that of the designed value, under the condition that the temperature rise of the main excitation winding is reduced, the direct current resistance of the excitation winding of the generator is also lower than that under the condition of rated power operation, and when the excitation current is constant, the excitation voltage is further reduced, namely the actual value of an excitation voltage instruction of a full-control alternating current excitation converter and the actual value of a control voltage instruction of a network side converter.
In the excitation control of an ac excited machine by a fully controlled ac excitation converter, a deviation occurs.
The invention improves the bearings at two ends of the traditional rotor 4 into a variable inertia connecting structure of a rotating shaft of the rotor 4, two ends of the rotor 4 are arranged on the base 1 through the variable inertia connecting mechanism 5, and a fan 6 is arranged on the shaft body of the rotor 4 positioned at the inner side of the variable inertia connecting mechanism 5;
the variable inertia connecting mechanism 5 comprises an outer shaft sleeve 9 with an oil inlet 7 and an oil outlet 8, a turbofan 10 and a roller bearing 11 which are sleeved on a shaft body of the rotor 4 are arranged inside the outer shaft sleeve 9, the outer shaft sleeves 9 positioned at two ends of the rotor 4 are connected into a closed circulation loop through a radiating pipe 12 which is spirally wound on the surface of a stator of the alternating current excitation motor 3, a pressure compensating pump 13 and an oil pump 14 are connected onto the radiating pipe 12, and the pressure compensating pump 13 and the oil pump 14 are electrically connected with a controller.
In the pneumatic and synchronous process of the AC excitation synchronous phase modulator, a turning gear is started, the rotor speed of an AC excitation motor reaches 4-6r/min, a starting motor SFC is started, excitation input is started, the AC excitation motor is driven to accelerate according to a set curve, in the accelerating process, a controller outputs a trigger signal to an oil pump 14, a medium oil body in an outer shaft sleeve 9 and a radiating pipe 12 is driven to drive a turbofan 10 through the work of the oil pump 14, and therefore the driving force is applied to the rotor 4 until the rated speed reaches 110%.
The controller continuously detects the slip frequency of the rotor 4 in the starting process of the alternating current excitation motor 3, when the slip is smaller than a set value, the polarity of the rotor voltage is judged, the oil pump 14 is triggered in the positive pole, and the slip frequency after the oil pump 14 is triggered is transmitted to the full-control alternating current excitation converter, so that the oil pump works 14, the starting phase of the rotor 4 is advanced, an excitation link is involved, the excitation time of the full-control alternating current excitation converter is short, the whole starting is enhanced, the synchronization is rapid, stable and reliable, the impact is reduced when the excitation is put into, and the salient pole effect of the alternating current excitation motor is strong.
In the invention, on the rotor overcurrent protection, when the controller sets two sections according to the rotor overcurrent protection and the rotor overcurrent protection, the action time of the two sections is different, the overcurrent action setting value and the action output delay can be set according to the specific motor and load requirements, the output acts on the switching, and acts on the shutdown when the switching cannot be carried out, when the signal which cannot be switched is transmitted to the controller, the pressure compensating pump 13 is switched in, and the pressure intensity in the medium oil body inside the outer shaft sleeve 9 and the radiating pipe 12 is increased, thereby increasing the rotation resistance of the turbofan 10.
When the alternating-current excitation motor is started, the rotating shaft of the rotor 4 drives the turbofan 10 in the outer shaft sleeve 9 to rotate, meanwhile, the medium oil bodies filled in the outer shaft sleeve 9 and the radiating pipes 12 rotate under the driving of the turbofan 10, and the outer shaft sleeves 9 at two ends of the rotor 4 are connected into a closed circulation loop through the radiating pipes 12 spirally wound on the surface of the stator 16 of the alternating-current excitation motor 3 to circulate in a reciprocating mode, so that the temperature rise synchronization of two ends of the rotor 4 of the alternating-current excitation motor 3 is realized.
The outer shaft sleeve 9 can be arranged to be in contact connection with a winding on a stator 16 of the alternating-current excitation motor 3 in a matching mode, so that heat transferred by a medium oil body in the outer shaft sleeve 9 comprises two parts, namely temperature rise of the winding of the stator 16 and temperature rise of a rotating shaft of a rotor, further synchronization of the temperature rise can be controlled through circulation of the medium oil body in the outer shaft sleeve 9, iron loss generated by a motor iron core of the alternating-current excitation motor 3 in an alternating magnetic field and copper loss generated after the winding is electrified are reduced, and the service life of the alternating-current excitation motor 3 is prolonged.
The outer sleeve 9 of the invention can be arranged to be in non-matching contact connection with the winding on the stator 16 of the ac excitation motor 3, and at the moment, the outer sleeve 9 only conducts and dissipates heat of the rotor 4.
Because the radiating pipe 12 spirally wound on the surface of the stator of the AC excitation motor 3 is arranged in the air cooling system of the stator of the AC excitation synchronous phase modulator, namely the radiating pipe 12 is in contact with the stator 16, the medium oil body in the circulating loop can simultaneously take away partial heat of the stator 16 and the rotor 4 through the air cooling system of the stator, the temperature rise synchronization of the stator 16 and the rotor 4 is realized through a cooling mode, and the temperature of the stator 16 and the rotor 4 is simultaneously adjusted.
The outer shaft sleeve 9 comprises a circulating cavity 902 and a clutch cavity 903 which are separated by a sealing partition 901, a turbofan 10 is sleeved on a shaft body of a rotor 4 in the circulating cavity 902, an oil inlet 7 and an oil outlet 8 are respectively installed at the top and the bottom of the circulating cavity 902, the turbofan 10 is sleeved on the shaft body of the rotor 4 through a piston sleeve 15, the piston sleeve 15 penetrates through the sealing partition 901 and extends into the clutch cavity 903, the piston sleeve 15 is connected with a rotating shaft movable key of the rotor 4 in the clutch cavity 903, and the piston sleeve 15 axially moves along the shaft body of the rotor 4 under the driving of a driving device.
The driving device can be a micro telescopic rod or an automatic reversing valve, and in the pneumatic and synchronous process of the alternating-current excitation synchronous phase modulator, the driving device drives the piston sleeve 15 to move along the rotating shaft of the rotor 4, so that the piston sleeve 15 is bonded with the rotating shaft in the clutch cavity 903.
The bearing outer ring, the roller cage and the bearing rollers of the roller bearing 11 are embedded into the clutch cavity 903, the bearing inner ring of the roller bearing 11 protrudes out of the clutch cavity 903 and is in clearance fit with the rotor, and the bearing inner ring of the roller bearing 11 is connected with the inner wall of the clutch cavity 903 through a seal ring.
The upper half end cover 2 is specifically a steam end upper half end cover 201 and a field end upper half end cover 202, a radiating pipe 12 connected with an oil outlet 8 of an outer shaft sleeve 9 positioned at the steam end upper half end cover 201 is spirally wound on a stator 16 of the alternating current excitation motor 3 far away from the steam end upper half end cover 201, and the other end of the radiating pipe 12 connected with the oil outlet 8 of the outer shaft sleeve 9 positioned at the steam end upper half end cover 201 is connected to an oil inlet 7 of the outer shaft sleeve 9 positioned at the field end upper half end cover 202.
Meanwhile, the ventilation openings of the exciter and the permanent magnet of the ac excitation synchronous phase modulator are integrated, that is, the fans on the two sides of the rotor and the air cooling device formed by the fans and the inner cavity of the upper half end cover cause unbalanced heat in the ventilation system, so that the temperature rise of the air outlets at the two ends of the ac excitation motor is different, and the temperature of the upper half end cover 201 on the steam end is usually higher than that of the upper half end cover 202 on the excitation end.
The radiating pipe 12 connected through the oil outlet 8 in the outer shaft sleeve 9 at the steam end upper half end cover 201 is spirally wound on the surface of the stator 16 at the lower temperature, and the radiating pipe 12 connected with the oil outlet 8 in the outer shaft sleeve 9 of the excitation end upper half end cover 202 is wound on the surface of the stator 16 at the higher temperature, so that the rapid temperature rise in the operation process of the stator 16 is ensured, and the temperature rise is kept consistent.
On the other hand, the stator 16 of the air cooling system and the liquid cooling system perform heat dissipation and heat generation of the rotor 4, so that the temperature rise of the alternating current excitation motor 3 is stabilized on a same level, the heat dissipation balance of the heating inside the alternating current excitation motor 3 is prevented from being damaged when the heat generation is increased and the heat dissipation is reduced, and the failure rate of the alternating current excitation motor 3 is reduced.
The invention also provides a control method of the alternating current excitation synchronous phase modulator generated by the alternating current excitation synchronous motor,
s100, acquiring voltage, current and rotating speed signals of the alternating current excitation motor through a sampling module in a controller, and transmitting the signals to a microprocessor for processing, wherein the microprocessor generates an excitation voltage instruction of a full-control alternating current excitation converter and a control voltage instruction of a network side converter according to a processing result;
s200, the microprocessor forms trigger pulses through a pulse module according to the silicon controlled trigger angle calculated by the program, and then converts the trigger pulses into trigger signals for intervention of a pressure compensating pump, an oil pump and a driving device;
s300, after an excitation voltage instruction of the full-control alternating-current excitation converter and an instruction execution period of a control voltage instruction of the grid-side converter are generated, a sampling module conducts secondary sampling on voltage, current and rotating speed signals of the alternating-current excitation motor after the variable inertia connecting mechanism is used as a load, and the secondary sampling signals are transmitted to a PID adjusting circuit through microprocessing.
S400, the PID regulating circuit takes constant reactive power regulation as an outer ring and constant current regulation as an inner ring, the reactive power regulating ring reacts quickly, and the exciting current compensation value of the full-control alternating current exciting converter is regulated, so that the exciting current value is changed, and finally the reactive power is kept constant.
The controller comprises a microprocessor, a sampling module, a pulse module and a PID (proportion integration differentiation) adjusting circuit, wherein the sampling module transmits the running state information of a stator and a rotor of the AC excitation motor to the microprocessor, the microprocessor calculates a trigger angle of a controllable silicon according to a program, then forms a trigger pulse through the pulse module, and converts the trigger pulse into a trigger signal for intervention of the pressure compensating pump, the oil pump and the driving device.
The microprocessor samples the rotor load running state information of the alternating current excitation motor after the pressure compensating pump, the oil pump and the driving device are involved in working again through the sampling module, and adjusts the excitation current of the alternating current excitation motor through the PID adjusting circuit.
The PID regulating circuit takes constant reactive power regulation as an outer ring and constant current regulation as an inner ring, the reactive power regulating ring reacts quickly to regulate the exciting current compensation value, so that the exciting current value is changed, and finally the reactive power is kept constant.
When the variable inertia connecting mechanism does not work as a load and the voltage of an excitation power supply changes, an excitation current regulator in the fully-controlled alternating-current excitation converter quickly reacts to maintain the excitation current unchanged.
In S100, the grid-side converter is configured to receive a control voltage command and regulate an input active power of the grid-side converter.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. An alternating current excitation synchronous phase modulator comprises a variable inertia connecting mechanism (5), a full-control alternating current excitation converter, a network side converter, a controller and a base (1), wherein the variable inertia connecting mechanism (5) is connected to a rotor (4) of an alternating current excitation motor (3), the upper half end cover (2) for mounting the alternating current excitation motor is arranged on the base (1), the full-control alternating current excitation converter is connected to the alternating current excitation motor (3), the network side converter is connected with the full-control alternating current excitation converter, the phase modulator is characterized in that two ends of the rotor (4) are mounted on the base (1) through the variable inertia connecting mechanism (5), and a fan (6) is mounted on a shaft body of the rotor (4) positioned on the inner side of the variable inertia connecting mechanism (5);
the variable inertia connecting mechanism (5) comprises an outer shaft sleeve (9) with an oil inlet (7) and an oil outlet (8), a turbofan (10) and a roller bearing (11) which are sleeved on a shaft body of the rotor (4) are arranged inside the outer shaft sleeve (9), the outer shaft sleeves (9) positioned at two ends of the rotor (4) are connected into a closed circulation loop through a radiating pipe (12) which is spirally wound on the surface of a stator of the alternating current excitation motor (3), a pressure compensating pump (13) and an oil pump (14) are connected onto the radiating pipe (12), and the pressure compensating pump (13) and the oil pump (14) are electrically connected with a controller;
the outer shaft sleeve (9) comprises a circulation cavity (902) and a clutch cavity (903) which are formed by separating through a sealing partition plate (901), a turbofan (10) is sleeved on a shaft body of a rotor (4) in the circulation cavity (902), an oil inlet (7) and an oil outlet (8) are respectively installed at the top and the bottom of the circulation cavity (902), the turbofan (10) is sleeved on the shaft body of the rotor (4) through a piston sleeve (15), the piston sleeve (15) penetrates through the sealing partition plate (901) and extends into the clutch cavity (903), the piston sleeve (15) is connected with a rotating shaft movable key of the rotor (4) in the clutch cavity (903) in a connecting mode, and the piston sleeve (15) axially moves along the shaft body of the rotor (4) under the driving of a driving device.
2. An AC excitation synchronous phase modifier according to claim 1, characterized in that the bearing outer ring, the roller cage and the bearing rollers of the roller bearing (11) are embedded in the clutch cavity (903), the bearing inner ring of the roller bearing (11) protrudes out of the clutch cavity (903) and is in clearance fit with the rotor, and the bearing inner ring of the roller bearing (11) is connected with the inner wall of the clutch cavity (903) through a sealing ring.
3. The AC excitation synchronous phase modulator as recited in claim 1, characterized in that the upper half end cap (2) is specifically a steam end upper half end cap (201) and an excitation end upper half end cap (202), a heat dissipation pipe (12) connected to an oil outlet (8) of an outer shaft sleeve (9) located at the steam end upper half end cap (201) is spirally wound on a stator (16) of the AC excitation motor (3) far away from the steam end upper half end cap (201), and the other end of the heat dissipation pipe (12) connected to the oil outlet (8) of the outer shaft sleeve (9) located at the steam end upper half end cap (201) is connected to an oil inlet (7) of the outer shaft sleeve (9) located at the excitation end upper half end cap (202).
4. An AC excitation synchronous phase modulator control method according to claim 1-3, characterized by comprising the steps of:
s100, acquiring voltage, current and rotating speed signals of the alternating current excitation motor through a sampling module in a controller, and transmitting the signals to a microprocessor for processing, wherein the microprocessor generates an excitation voltage instruction of a full-control alternating current excitation converter and a control voltage instruction of a network side converter according to a processing result;
s200, the microprocessor forms trigger pulses through a pulse module according to the silicon controlled trigger angle calculated by the program, and then converts the trigger pulses into trigger signals for intervention of a pressure compensating pump, an oil pump and a driving device;
s300, after an excitation voltage instruction of a full-control alternating-current excitation converter and an instruction execution period of a control voltage instruction of a network side converter are generated by a sampling module, secondary sampling is carried out on voltage, current and rotating speed signals of an alternating-current excitation motor after a variable inertia connecting mechanism is used as a load, and the secondary sampling signals are transmitted to a PID (proportion integration differentiation) adjusting circuit by microprocessing;
s400, the PID regulating circuit takes constant reactive power regulation as an outer ring and constant current regulation as an inner ring, the reactive power regulating ring reacts quickly, and the exciting current compensation value of the full-control alternating current exciting converter is regulated, so that the exciting current value is changed, and finally the reactive power is kept constant.
5. The control method of the alternating-current excitation synchronous phase modulator according to claim 4, wherein the controller comprises a microprocessor, a sampling module, a pulse module and a PID (proportion integration differentiation) regulating circuit, the sampling module transmits running state information of a stator and a rotor of the alternating-current excitation motor to the microprocessor, the microprocessor calculates a silicon controlled trigger angle according to a program, then the pulse module forms a trigger pulse, and the trigger pulse is converted into a trigger signal for intervention of the pressure compensating pump, the oil pump and the driving device.
6. The control method of the AC excitation synchronous phase modulator according to claim 5, wherein the microprocessor samples again the rotor load operation state information of the AC excitation motor after the pressure compensating pump, the oil pump and the driving device are involved in operation through the sampling module, and adjusts the excitation current of the AC excitation motor through the PID adjusting circuit.
7. The control method of the AC excitation synchronous phase modulator according to claim 6, wherein when the variable inertia connecting mechanism does not work as a load and the excitation power supply voltage changes, the excitation current regulator in the fully-controlled AC excitation converter reacts quickly to maintain the excitation current unchanged.
8. An AC excitation synchronous phase modulator control method as claimed in claim 4, wherein in S100, the grid side converter is used for receiving a control voltage command and regulating the input active power of the grid side converter.
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| CN111841362A (en) * | 2020-07-24 | 2020-10-30 | 广州狸园科技有限公司 | Stirring device rotating speed control system |
| CN113175418A (en) * | 2021-04-28 | 2021-07-27 | 上海电气风电集团股份有限公司 | Electric barring gear of direct-drive generator |
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