CN101790841B - Method for improving the dynamic stability of electric-power systems and for damping oscillations thereof and a device for carrying out said method - Google Patents
Method for improving the dynamic stability of electric-power systems and for damping oscillations thereof and a device for carrying out said method Download PDFInfo
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- CN101790841B CN101790841B CN200880104682.3A CN200880104682A CN101790841B CN 101790841 B CN101790841 B CN 101790841B CN 200880104682 A CN200880104682 A CN 200880104682A CN 101790841 B CN101790841 B CN 101790841B
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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
- H02P9/08—Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
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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
- H02P9/06—Control effected upon clutch or other mechanical power transmission means and dependent upon electric output value of the generator
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Abstract
The inventive method for improving the dynamic stability of an electric-power system consists in monitoring the rotational speed of the rotor of a synchronous AC generator and, after applying disturbance to the system, in reducing the rotational speed of the rotor of said synchronous AC generator to the rotational speed of the stator magnetic field by mechanically braking said generator rotor. For this purpose, the method also consists in mechanically connecting an electromagnetic brake to the generator rotor and to the rotor of a primary motor by means of couplers, in continuously measuring voltage on the generator clamps and current of thegenerator stator in order to determine the electromagnetic power of the generator, in comparing said power with the electromagnetic power prior to the disturbance application, if the compared value is greater than a specified value, in forming a control signal for switching-on the electromagnetic brake, in determining a brake torque value based on the difference between the values of the measured electromagnetic power and the electromagnetic power prior to the disturbance application, in determining the time of the brake torque application according to the change in rotational speed of the generator rotor after the disturbance application andin comparing it with the value prior to the disturbance application. The electromagnetic brake is switched-off upon the equality between the actual rotational speed of the rotor and the rotational speed thereof prior to the disturbance application being attained and when the measured power and the power prior to the disturbance application are equal. A system for improving the dynamic stability of the electric-power system and a method and system for damping electromechanical oscillations thereof are also disclosed.
Description
Technical field
The present invention relates to power engineering, and relate in particular to a kind of dynamic stability for improvement of electric power system and the method for its electromechanical oscillations of decay and the device that is used for realizing this method.
The present invention can be used in the dynamic stability of improving electric power system (Electric Power Systems, EPS) and the vibration that decays generator amature.Dynamic stability is that system turns back to its ability normal or nearly normal operation mode after large disturbance, sizable variation in these disturbances such as short circuit, network interruption, power generator disconnection and load capacitance.Electromechanical oscillations is in response to the disturbance in system the time or because the mismatch operation of the automatic control system of EPS parts occurs, and these EPS parts have synchronous generator, controlled reactive power source and miscellaneous part.
Background technology
Electric power system is intended to effectively and reliably provide to the consumer electric power of desired amount and qualified quality.EPS comprise prime mover (steam, hydraulic pressure and combustion gas turbine and liquid or gas driven piston motor) and for generation of the synchronous generator that is called generating set (Generating Units, GU) of electric power, change boosting and the step-down power transformer of voltage of power and electric current; Span is from the power circuit of transferring electric power; Corrective networks configuration and with the switchgear of current circuit rectification comprises switch and isolating switch.Electric power by GU produce, in transformer conversion and by power line transmission to consuming the place, voltage raises in these transformers and electric current reduces in these transformers, and do not change power.Power circuit typically is combined in electric power networks.Then, electric power offers electricity consumer by step-down transformer, and these step-down transformers reduce voltage and the electric current that raises.Except above-mentioned parts, the equipment that EPS also comprises for measurement parameter and is used for controlling the operational mode of EPS, these parameters are frequency, voltage, electric current, power.
The basic operational mode of EPS is a kind of normal mode, in this normal mode, effectively and reliably provides electric power to the consumer.Except this normal mode, EPS can also be with heavy load, urgent, rear urgent and normal transient mode operation.Emergency mode is short-term, and its duration is limited by response time and the switchgear of relay system and EPS automation usually.Then, this system switches to rear emergency mode.From emergency mode backward the transition of emergency mode be called transient state.Transient state comprises two processes: electromagnetism transient state and dynamo-electric transient state.Electromagnetism transient state (some millisecond) rapidly appears at the EPS electric part, and dynamo-electric transient state all occurs at mechanical part and electric part, be associated with the motion of electric generating set rotor and second extremely occuring in the time period of several seconds from part.If large disturbance occurs, the disturbance that is for example caused by the emergency cut-off of the disconnection of short circuit, large capacity load/connections, power generating equipment, system turns back to pre-disturbance or perturbation mode closely in advance, can think that it has dynamic stability.
If might at electromagnetism and/or the mechanical torque controlled between dynamo-electric transient period on generator unit shaft, can improve the condition of EPS dynamic stability.Can be by improving these dynamic stability conditions with the generator field intensity set in EPS, power circuit inductance compensation device, synchronous generator electric brake arrangement.
When the slip of synchronous generator rotor occurs or the voltage by the generator terminal be brought down below rated value (response condition) 85% the time, generator field intensity set (Fig. 1) provides the voltage of several times to increase in the magnet exciting coil 10 (1) of synchronous generator 10.The generator field intensity set comprises comparison means (be used for slip or voltage or both) and voltage source.When response condition is met, provide voltage signal from this voltage source to this synchronous generator airport system, this causes the voltage by the magnet exciting coil terminal is increased to over the coil rating value several times, and this multiple equals this field intensity ratio.Electric current in this magnet exciting coil begins conversely along with this magnet exciting coil time constant and index ground increase, for the generator of dissimilar and capacity, and this time constant from 2.7 to 13 seconds.In most of common turbogenerators, this value is about 7 seconds.
This field intensity operation relates to increases the generator field current, thereby increases electromagnetic torque, and this makes the generator stability of synchronization be maintained after disturbing influence in some cases, as short circuit.
When controlling (AEC) 10 (2) for improvement of the dynamic stability condition with the automatic magnetic exciting of field intensity, the speed that this electromagnetic torque increases is being subject to this field coil time constant and is being subject to this exciter time constant on less degree in fact on larger degree, and this can limit the ability of this method for improvement of the dynamic stability condition.In addition, resistance between this electromagnetic torque value and this generator linkage unit and receiving system unit is inversely proportional to, and after short circuit, this resistance can be owing to being increased by the relaying of this EPS and the correct or disconnection power circuit circuit that wrong response causes of automation.Therefore, when the power circuit circuit disconnects, the Efficiency Decreasing of this field intensity AEC.
In general, this AEC field intensity efficient depends on generator time constant and current power network state and pattern, and this has just stoped the effective control to the balance on the GU axle of all patterns.
Use field intensity set to have following shortcoming:
-due to the relatively large time constant (approximately 7 seconds) of this synchronous generator field coil, so can not increase rapidly the dynamo-electric moment of torsion of this generating;
-after disturbing influence was eliminated, this generator electromagnetic torque height depended on EPS scheme and pattern.
Line reactance compensation arrangement (Fig. 2) is for increasing the electromagnetic torque on this generator shaft.Line reactance compensates to relate to electric capacity is added to this circuit, this electric capacity such as capacitor group, and the speed of this capacitor group is limited by the degree of line build-out.If the part of line reactance is compensated, this generator electromagnetic torque increases, and other condition is identical, and this makes these dynamic stability conditions to be improved, and in some cases, this makes this generator stability of synchronization to be maintained after disturbing influence, for example short circuit of this disturbing influence.
When using power circuit inductance compensation device, except other, the increase of this electromagnetic torque also depends on the voltage by these power circuit ends, reduces between the transient period of these voltages in EPS, and this can reduce the efficient of this method.
In general, this line reactance compensation efficiency depends on state and the operational mode of this electric current electric power networks largely, and this has just stoped the effective control to the balance on the GU axle.
Closely-related with the present invention is the method for the electric braking that is used for synchronous generator rotor realized by electric braking device.
Be connected to generator bus (Fig. 3) and realize electric braking by braking effective resistance.When this resistance connects, produce other electromagnetic torque on the GU axle, this causes braking.Connected in order to brake effective resistance 10 (4), used mechanical output switch 10 (3) or power semiconductor electron key.
When this brake resistance connected, this GU axle electromagnetic torque depended on the voltage at this resistance tie point place substantially.In order to switch this braking effective resistance, need the quick high-pressure switch, this quick high-pressure switch has the relatively short life-span, or is used for the high-pressure electronic switch of high switch current, and this electronic switch is quite expensive.The connection of this running under braking resistance causes the reduction at the voltage at this tie point place.This generator electromagnetic torque reduces along with the reduction of voltage, and this can cause damage and reduce the efficient of this method these GU axle deceleration of electrons conditions.In order to eliminate the reduction of this voltage, except this brake resistance, should also provide reactive power compensator, this power compensator is expensive and can dally when expection is used for deceleration of electrons, although it can be used for the voltage in other unit of this electrical network is controlled.
Use this electric braking method to have following shortcoming:
-height of the GU axle braking torque that produces on the voltage level at the tie point place of this braking effective resistance is relied on, this reduces electric braking efficient when lower voltage;
-in the reduction of the voltage at the tie point place of this braking effective resistance, this can make the dynamic stability worsening condition of EPS on the whole;
-must be provided for the zone of the structure of these braking effective resistances.
Summary of the invention
The object of the present invention is to provide a kind of method of the dynamic stability for improvement of electic power system, this method makes it to eliminate the braking torque that produces in the line resistance at the electric power transmission place that connects this generating set and receiving system and the dependence of voltage level on generating set (GU) axle, overcoming using the demand of other high-voltage switch gear, semiconductor switch and other devices, and overcome demand to the zone of the structure that is provided for braking effective resistance.
Another object of the present invention is to provide a kind of method of the electromechanical oscillations for the decay electic power system.
A further object of the present invention is to provide a kind of device of the dynamic stability for improvement of electic power system, and the GU axle braking torque that the design of this device can be eliminated generation is to the dependence at the voltage level at this device tie point place.
Another purpose of the present invention is to provide a kind of device of the electromechanical oscillations for the decay electic power system.
This purpose realizes by a kind of method that dynamic stability for improvement of electic power system is provided, this electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and load, and the method comprises: the rotating speed of the rotor of monitoring synchronous alternator; After disturbance is applied to this system, the rotating speed of the rotor of described synchronous alternator is down to the rotating speed of stator field, described method is characterised in that the described reduction of the rotating speed of this generator amature comprises: by being mechanically connected to this generator amature and being connected to this prime mover rotor with described generator amature mechanical braking with the electromagnetic brake of this generator shaft and this prime mover shaft coaxial arrangement with connector; The voltage of these generator terminals of continuous measurement and this generator unit stator electric current, and determine electromagnetic power from this generator of described voltage and current; The electromagnetic power of this generator of obtaining and electromagnetic power before this disturbance are compared; If the value that is compared greater than particular value, generates control signal to start this electromagnetic brake, when so carrying out, determine braking torque from measured electromagnetic power and the difference between the electromagnetic power before this disturbance; Rotating speed by determining this generator amature after this disturbance and the value before its and this disturbance is compared the time that this braking torque application is determined in variation from the rotating speed of this generator amature; When reaching impartial between the rotating speed of this rotor before the actual speed of this rotor and this disturbance and stopping this electromagnetic brake at measured power when power before this disturbance equates.
In described mechanical connection, preferably this electromagnetic brake is arranged in the position that is selected from lower group, this group comprises: the position in the position of this generating pusher side, in the position of this prime mover side, between this generator and this prime mover.
in alternate embodiment, this purpose realizes by a kind of method that dynamic stability for improvement of electic power system is provided, this electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and load, the method comprises: the rotating speed of the rotor of monitoring synchronous alternator, and after disturbance is applied to this system, the rotating speed of the rotor of described synchronous alternator is down to the rotating speed of stator field, described method is characterised in that the described reduction of the rotating speed of this generator comprises: by being mechanically connected to this generator amature and being connected to this prime mover rotor with described generator amature mechanical braking with the electromagnetic brake of this generator shaft and this prime mover shaft coaxial arrangement with connector, the voltage of these generator terminals of continuous measurement, the voltage of these generator terminals of obtaining is compared with specific voltage, and this specific voltage is in 65～95% scope of rated voltage, if the value that is compared less than this particular value, generates control signal to start this electromagnetic brake, when so carrying out, determine continuously this generator unit stator electric current, determine the electromagnetic power of this generator from measured magnitude of voltage and current value, the value of this generator electromagnetic power of obtaining and the electromagnetic power before this disturbance are compared, determine braking torque from the difference of measured electromagnetic power and the value between the electromagnetic power before this disturbance, rotating speed by determining this generator amature after this disturbance and the value before its and this disturbance is compared the time that this braking torque application is determined in variation from the rotating speed of this generator amature, when reach impartial between the rotating speed of this rotor before the actual speed of this rotor and disturbance and at measured power when power before this disturbance application equates, stop this electromagnetic brake.
In described mechanical connection, preferably this electromagnetic brake is arranged in the position that is selected from lower group, this group comprises: the position in the position of this generating pusher side, in the position of this prime mover side, between this generator and this prime mover.
in alternate embodiment, this purpose realizes by a kind of method that dynamic stability for improvement of electic power system is provided, this electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and load, the method comprises: the monitoring synchronous alternator rotor rotating speed and after disturbance is applied to this system, the rotating speed of the rotor of described synchronous alternator is down to the rotating speed of stator field, described method is characterised in that the described reduction of the rotating speed of this generator amature comprises: by being mechanically connected to this generator amature and being connected to this prime mover rotor with described generator amature mechanical braking with the electromagnetic brake of this generator shaft and this prime mover shaft coaxial arrangement with connector, the rotating speed deviation of this generator amature that detection causes by the disturbance that is applied to this system, and determine speed difference between measured speed and this disturbance rotating speed before, described difference and particular value are compared, if the value that is compared is greater than this particular value, generate control signal to start this electromagnetic brake, when so carrying out, the voltage of these generator terminals of continuous measurement and this generator unit stator electric current, and determine the electromagnetic power of this generator from described voltage and current, determine braking torque from measured electromagnetic power and the difference between the value of the electromagnetic power before this disturbance, rotating speed by determining this generator amature after this disturbance and the value before its and this disturbance is compared the time that this braking torque application is determined in variation from the rotating speed of this generator amature, when reach impartial between the rotating speed of this rotor before the actual speed of this rotor and disturbance and at measured power when power before this disturbance application equates, stop this electromagnetic brake.
In described mechanical connection, preferably this electromagnetic brake is arranged in the position that is selected from lower group, this group comprises: the position in the position of this generating pusher side, in the position of this prime mover side, between this generator and this prime mover.
Also by providing a kind of method of electromechanical oscillations for the decay electic power system to realize, the method comprises purpose of the present invention: the rotating speed of the rotor of monitoring synchronous alternator and the voltage and current of stator; The voltage of these generator terminals of continuous measurement and this generator unit stator electric current, and determine electromagnetic power from this generator of this voltage and current; Determine the time-derivative of the voltage of generator terminal; Determine the time-derivative of this generator unit stator electric current; Rotating speed under the equilibrium mode is determined the deviation of the rotating speed of this measured rotor; Determine the time-derivative of the rotating speed of this measured rotor; The deviation of the rotating speed of the time-derivative of the voltage and current that obtains, this generator amature and the signal of this rotating speed deviate are sued for peace, control the signal of telecommunication to generate, this signal of telecommunication is provided for voltage transformer with attenuated oscillation.
purpose of the present invention also realizes by a kind of method that provides dynamic stability for improvement of electic power system also to be used for the electromechanical oscillations of decay electic power system, this electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and electric loading, the method comprises: the rotating speed of the rotor of monitoring synchronous alternator, and after disturbance is applied to this system, the rotating speed of the rotor of described synchronous alternator is down to the rotating speed of this stator field, wherein, according to the present invention, the described reduction of the rotating speed of this generator amature comprises: by being mechanically connected to this generator amature and this prime mover rotor with the electromagnetic brake of the axle coaxial arrangement of this generator shaft and this prime mover with described generator amature mechanical braking with connector, the voltage of these generator terminals of continuous measurement and this generator unit stator electric current, and determine electromagnetic power from this generator of this voltage and current, the electromagnetic power of this generator of obtaining and electromagnetic power before this disturbance are compared, if the value that is compared greater than particular value, generates control signal to start this electromagnetic brake, when so carrying out, determine braking torque from the difference of measured electromagnetic power and the value between the electromagnetic power before this disturbance, rotating speed by determining this generator amature after this disturbance and the value before its and this disturbance is compared the time that this braking torque application is determined in variation from the rotating speed of this generator amature, the electromechanical oscillations of this electic power system that then decays, described decay comprises: determine the time-derivative by the voltage of these generator terminals, determine the time-derivative of this generator unit stator electric current, rotating speed under the equilibrium mode is determined the deviation of the rotating speed of this measured rotor, determine the time-derivative of the rotating speed of this measured rotor, the deviation of the rotating speed of the time-derivative of the voltage and current that obtains, this generator amature and the signal of this rotating speed deviate are sued for peace, control the signal of telecommunication to generate, this signal of telecommunication is provided for voltage transformer with attenuated oscillation.
this purpose also realizes by the system that provides a kind of dynamic stability for improvement of electic power system also to be used for the electromechanical oscillations of decay electic power system, this electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and electric loading, and described system comprises: the generator amature speed probe, the generator amature rotating speed reduces device, this device is used for after disturbance is applied to this system, the rotating speed of this generator amature being down to the rotating speed of this stator field, wherein, it is a kind of dynamo-electric brake that described generator amature rotating speed reduces device, this dynamo-electric brake comprises brake disc and the electromagnetic system that is formed by magnetic conductor and inductance coil, this dish is arranged in this magnetic gap, described system is characterised in that this electromagnetic brake and this generator shaft and this prime mover shaft coaxial arrangement, and be mechanically connected to the rotor of this generator amature and this prime mover by connector, this system also comprises for the control unit that generates control signal, these control signals are used for this electromagnetic brake, described control unit comprises: the generator electromagnetic power determining unit, be used for the generator electromagnetic power after this disturbance and disturbance are used the comparing unit that electromagnetic power before compares, electromagnetic brake starts the control signal generation unit, this electromagnetic brake starts control signal generation unit and is used for generating during greater than particular value at this comparison value the electromagnetic braking enabling signal, this system also comprises for voltage sensor and the generator unit stator current sensor determined by the voltage of these generator terminals, these two transducers all are connected to this control unit, generator amature speed probe, brake torque value and time instrument transformer and power supply also are connected to this control unit, this brake torque value and time instrument transformer have the input of the output that is connected to this control unit and are connected to the output of this electromagnetic braking coil, and this power sourced electric is connected to this instrument transformer.
In described mechanical connection, preferably this electromagnetic brake is arranged in the position that is selected from lower group, this group comprises: the position in the position of this generating pusher side, in the position of this prime mover side, between this generator and this prime mover.
Description of drawings
In order to understand better the present invention, by reference to the following description, should read by reference to the accompanying drawings these descriptions, wherein:
Fig. 1 is the schematic diagram according to the generator field intensity set of prior art;
Fig. 2 is the schematic diagram according to the line reactance compensation arrangement of prior art;
Fig. 3 is the schematic diagram according to the electric braking of prior art;
Fig. 4 is that wherein, this electromagnetic brake is connected between prime mover and generator according to the schematic diagram of the system for improvement of dynamic stability of the present invention;
Fig. 5 is the schematic diagram according to electromagnetic brake control system of the present invention;
Fig. 6 is the schematic diagram according to dynamic stability improved system of the present invention, and wherein, this electromagnetic brake is connected to generator;
Fig. 7 is the schematic diagram according to dynamic stability improved system of the present invention, and wherein, this electromagnetic brake is connected to prime mover;
Fig. 8 schematically shows the circumferential arrangement according to the inductance coil of the axial direction with this brake disc of the present invention;
Fig. 9 is for improvement of the schematic diagram of dynamic stability with the integrated system of decay electromechanical oscillations according to of the present invention.
Embodiment
Comprise generator amature speed probe 1 (Fig. 4) and be used for during disturbance is applied to this system and the generator amature rotating speed of afterwards rotating speed of this generator amature being down to the rotating speed of stator field reduces device 2 for improvement of the system of the dynamic stability of electic power system, this electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and electric loading.Device 3 is the electromagnetic brakes 3 that comprise brake disc 4 and electromagnetic system, and this electromagnetic system is formed by magnetic conductor 5 and inductance coil 6, and brake disc 4 is contained in the gap 7 of magnetic conductor 5.
The axle 8 of electromagnetic brake 3 and the axle 9 of generator 10 and axle 11 coaxial arrangement of prime mover 12, and be mechanically connected to generator shaft 9 and prime mover shaft 11 by connector 13,14 respectively.
This system comprises that also for the control unit 15 that generates control signal, these control signals are used for electromagnetic brake 3.Control unit 15 comprises generator electromagnetic power determining unit 16 (Fig. 5), be used for the generator electromagnetic power before the storage disturbance generator electromagnetic power memory cell 17, be used for the comparing unit 18 that the generator electromagnetic power after disturbance and electromagnetic power before disturbance are compared and be used for generating the control enabling signal to start the control enabling signal generation unit 19 of this electromagnetic brake during greater than particular value at this comparison value.The output of unit 16 is connected to the input of unit 17, and is connected to the first input end of unit 19, and the output of unit 17 is connected to the second input of unit 18.The described output of unit 17 also is connected to an input of unit 18, and the output of unit 16 is connected to another input.
This system also comprises be used to voltage sensor 20 (Fig. 4) and voltage transformer 21 (Fig. 5), generator unit stator current sensor 22 (Fig. 4) and the generator unit stator current transformer 23 (Fig. 5) determined at the voltage at these generator terminals places.Unit 20 and 22 output are connected respectively to the unit 21 of control unit 15,23 input.
Generator amature speed probe 1 is connected to the input of unit 15 by rotating speed instrument transformer 25.Unit 27 is connected to the input of unit 18 and brings in storage with the rotor speed of pre-perturbation mode.For this purpose, the output of unit 25 is connected to the input of unit 27, and the output of comparing unit 30 is connected to the input 29 of unit 27.The brake disc protection channel is located in control unit 15, for this purpose, by temperature instrument transformer 32, brake disc temperature sensor (not shown) is connected to the input 31 of unit 18.
This system comprises brake torque value and time instrument transformer 34, and the input of this instrument transformer is connected to the output 35 of control unit 15, and output 36 is connected to the coil 6 of electromagnetic brake 3.
This system also comprises the power supply 37 (Fig. 6) that is connected to instrument transformer 34.
In order to produce braking torque on this generator unit shaft, can use electromagnetic brake 3, can this electromagnetic brake be arranged in in three positions one in the mode of mechanical connection: in the position of this generating pusher side (Fig. 6), in the position of this prime mover side (Fig. 7) or the position (Fig. 4) between this generator and this prime mover.
In another embodiment, this magnetic system comprises the inductance coil with magnetic core, and these magnetic cores are with the axial direction circumferential arrangement (Fig. 8) of this brake disc.The quantity of coil is even number, and the coil magnetic pole is around circle alternate.In these two embodiment, this brake disc has cooling channel, i.e. this design allows to force circulate coolant.
The size of the electric current in this electromagnet is subjected to the control (Fig. 7) of automatic control unit 15.Electromagnet coils by power supply 37 by brake torque value and time instrument transformer 34 feeds.Instrument transformer 34 is a kind of controllable voltage (electric current) instrument transformers.Power supply 37 is that the operation in a kind of auxiliary source system or power station exchanges (AC) or direct current (DC) circuit.In response to the variation in following parameter, electric current is regulated: GU axle rotating speed, at voltage and the dynamo current at generator terminal place.In addition, unit 15 receptions are from the control signal of the systematic regulator 33 of the control that higher level is provided.15 offer instrument transformer 34 with control signal from the unit, and this instrument transformer is then directly regulated this electromagnet coils stalling current.
Fig. 9 shows the schematic diagram for improvement of the integrated system of dynamic stability and decay electromechanical oscillations.This system comprises electromagnetic brake 3 and control unit 15.Brake disc temperature sensor 38 is connected to comparing unit 18 by temperature instrument transformer 32.
The output 50 of unit 39 is connected to the input 51 of unit 18.
Threshold value dish temperature value is offered the input 52 of unit 18.
In addition, electromagnetic brake (EMB) can be integrated with generator 10.In this case, EMB can be contained in the generator casing (not shown).In one embodiment, power supply 37 is mounted in a kind of AC or the DC generator on the axle 8 of electromagnetic brake 3.
This system moves in the following manner.
Electic power system (EPS) comprises the equipment for generation of, transmission and consumption of electric power (EP).Produce on outfit of equipment and comprise synchronous turbogenerator and hydraulic turbine generator; Transmission equipment comprises transformer and power circuit generally.
The EPS state that is in specified moment or time period is called " pattern ".Pattern is limited by the parts that start and the load on them.Be called the EPS mode parameter in the value of voltage, power and the electric current at these system units places and the speed of definite electrical power generation, transmission, scheduling and consumption process.
In service at EPS, can be occurred by the different disturbance that circuit, network interrupt, the maloperation of switching, relaying and the automation of heavy load etc. causes.Machinery on generator unit shaft and the imbalance of electromagnetic torque can cause the swing of its rotor.Generator amature swings with respect to stator field, and this causes the especially variation of voltage of mode parameter, and the variation of voltage causes unsettled Expenditure Levels and causes other EPS generating set and the swing of load unit.Swing has different amplitudes and cause perturbation in the synchronous operation of this generator, and causes asynchronous operation subsequently, and this asynchronous operation is a kind of very undesirable power system behavior.In addition, between the low frequency system, vibration is intrinsic in the EPS of existing automatic control.
The following equation that moves through of GU rotor is described:
Wherein, ω is the angle rotating speed of this generator (or GU) rotor; ω
0The angle rotating speed of the generator under equilibrium mode, (ω typically
0=ω
nom); ω
nomIt is the specified angle rotating speed of this generator; M
TIt is the moment of torsion of this prime mover; M
elThis generator electromagnetic torque (in this equation, the moment of torsion of this prime mover and generator is with relative unit and equal respectively in number original machine power and generator electromagnetic power).
In service in the power station, turbine produces on this axle and accelerates moment of torsion M
T, and this generator produces braking torque M
elIn normal power generation pattern, the modulus of these moments of torsion that produced by this prime mover and generator equates and opposite direction.Therefore, in normal mode, this GU axle speed does not change along with the time, ω-ω
0=0.
The position of this generator amature is limited by angle δ, and this angle is relevant with this angle speed:
In equilibrium mode, this generator is with angle δ
0Operation is in certain power output of working voltage at these generator terminals places corresponding to this angle.In general, if turn back to after this disturbance is removed at this original machine power, EPS net structure and this generator amature that has arrived when unchanged less than the angle value of 180 ° in service and be in advance the promptly angle value of pattern, perhaps reach another angle value, can think that this dynamic stability is maintained, this another angle value is limited by the condition of stable rear emergency mode.
When disturbance is applied to EPS, M
elChange and imbalance occurs on this generator shaft, this can cause acceleration and the change of this generator amature rotating speed usually, and causes respectively swinging.The asynchronous running of generator appears in some cases.
Now, if electromagnetic brake is connected to the axle of this prime mover generator assembly, the capability of influence of the balance on generator unit shaft occurred, and irrelevant with these current EPS mode parameters.Because EMB only produces braking torque, so ((ω-ω when the positive variance of speed only
0)＞0) ((M and during the positive variance of the machinery on this generator unit shaft and electromagnetic torque
T-M
el)＞0) require to use this brake apparatus.
Wherein, M
EMBIt is the moment of torsion that is produced by EMB.
Therefore, at separately EMB parameter and (M
EMB(t)) control can keep the synchronous operation of this generator and the electromechanical oscillations of this generating set of can decaying and the vibration between system under large disturbance.
When producing magnetic field when this electromagnet coils transmission current, by the body of this coil magnetic core, magnetic conductor and brake disc that should rotation, that this magnetic field is closed, induced current in this magnetic field, the magnetic field interaction of these electric currents and this electromagnet.Interaction between electric current and magnetic field produces braking torque.The size of the electric current in the coil of electromagnet that can be by changing this EMB magnetic system is controlled this brake torque value.
When disturbance was applied to this system, this generating set (GU) axle began to accelerate.15 (Fig. 7) provide GU rotor speed signal to transducer 1 to the unit, to estimate the variation of this generator amature rotating speed.If meet the following conditions, this system produces the signal that increases the electric current in this EMB coil, and this signal is transferred to controlled voltage (electric current) instrument transformer that the voltage at this electromagnet coils place is increased, and the transmission braking torque, these conditions are: the acceleration of this GU axle and with respect to the decline (the perhaps decline of this generator electrical power) of the voltage of the generator bus of the voltage of the equilibrium mode of front.In a single day this axle rotating speed equals stator electromagnetic field speed, and in a single day measured generator power equal the power before this disturbance, just EMB is interrupted (electric current of its coil being down to zero).Perhaps, in a single day this generator unit shaft rotating speed equals stator electromagnetic field rotating speed, and in a single day measured generator electromagnetic power equal this turbine mechanical output, just EMB is interrupted.Then, synchronous swing beginning, and this GU enters equilibrium mode when correctly the arranging of automatic regulator.
Electromechanical oscillations for this electic power system that decays, unit 21 is to time diffusion unit 41 (Fig. 9) output signal, unit 23 is to deviation unit 43 output signals, unit 23 is to time diffusion unit 45 output signals, unit 25 is to deviation unit 47 output signals, and unit 25 is to time diffusion unit 49 output signals.
Only produce the moment of torsion (braking) of a type due to EMB, but have variable value, so in order to improve these electric system dynamic stability conditions, this EMB can be started once or repeated priming according to specific EPS pattern.Owing to can regulate this braking torque on a large scale, so EMB can be used in the synchronous swing of this generator of decay.
When various faults (reduction of the oil pressure in lubricant passage way, prime mover (turbine) or generator failure) occured this generating set, EMB can be used in urgent Speed Reduction.
EMB can be used in the electromechanical oscillations of decay synchronous compensator.In this case, this synchronous compensator and ENT are incorporated in single shell.
A kind of method of the dynamic stability for improvement of electic power system is achieved as follows.
By this generator amature mechanical braking being reduced the rotating speed of this generator amature, described mechanical braking comprises: will be mechanically connected to this generator amature and be connected to this prime mover rotor with the electromagnetic brake of this generator shaft and this prime mover shaft coaxial arrangement by connector.
Continuous measurement by these generator terminals voltage and this generator unit stator electric current to determine the electromagnetic power from this generator of this voltage and current.
The electromagnetic power of this measured generator and the electromagnetic power before this disturbance are compared.
If the value that is compared greater than particular value, generates control signal to start this electromagnetic brake, this step comprises:
Determine braking torque from measured electromagnetic power and the difference between the electromagnetic power before this disturbance;
The time that this braking torque is used is determined in variation from the rotating speed of this generator amature, for this purpose, and the rotating speed of this generator after deterministic disturbances and its and this disturbance value is before compared;
When reach impartial between the rotating speed of this rotor before the actual speed of this rotor and this disturbance and at the electromagnetic power of this measured generator when power before this disturbance equates, stop this electromagnetic brake.
Perhaps reach impartial and when the electromagnetic power of this measured generator equates with the mechanical output of this turbine, stop this electromagnetic brake between the rotating speed of this generating set before the actual speed of this generating set and this disturbance.
In described mechanical connection, preferably this electromagnetic brake is arranged in this generating pusher side or in this prime mover side or between this generator and this prime mover.
In a second embodiment, a kind of method of the dynamic stability for improvement of electic power system comprises:
Continuous measurement is by the voltage of these generator terminals;
The voltage that passes through these generator terminals that obtains and specific voltage are compared, and this specific voltage is in 65～95% scope of rated voltage;
If the value that is compared less than this particular value, generates control signal to start this electromagnetic brake;
Determine continuously this generator unit stator electric current;
Determine the electromagnetic power of this generator from measured magnitude of voltage and current value;
The value of this generator electromagnetic power of obtaining and the electromagnetic power before this disturbance are compared;
Determine braking torque from measured electromagnetic power and the difference between the electromagnetic power before this disturbance;
The time that this braking torque is used is determined in variation from the rotating speed of this generator amature, for this purpose, determines the rotating speed of this disturbance this generator amature afterwards and itself and this disturbance value is before compared;
When reaching impartial between the rotating speed of this rotor before the actual speed of this rotor and disturbance and stopping this electromagnetic brake at measured power when power before this disturbance equates.
Perhaps reach impartial and when the electromagnetic power of this measured generator equates with the mechanical output of this turbine, stop this electromagnetic brake between the rotating speed of this generating set before the actual speed of this generating set and this disturbance.
In the 3rd embodiment, a kind of method of the dynamic stability for improvement of electic power system comprises:
The rotating speed deviation of this generator amature that detection causes by the disturbance that is applied to this system, and determine that measured speed and this disturbance use the speed difference between rotating speed before;
Described difference and particular value are compared;
If the value that is compared greater than this particular value, generates control signal to start this electromagnetic brake;
Continuous measurement is by voltage and this generator unit stator electric current of these generator terminals, to determine the electromagnetic power of this generator from this voltage and current;
Determine braking torque from measured electromagnetic power and the difference between the value of the electromagnetic power before this disturbance;
The time that this braking torque is used is determined in variation from the rotating speed of this generator amature, for this purpose, determines the rotating speed of this disturbance application this generator amature afterwards and itself and this disturbance value is before compared;
When reaching impartial between the rotating speed of this rotor before the actual speed of this rotor and disturbance and stopping this electromagnetic brake at measured power when power before this disturbance equates.
According to the present invention, except aforementioned three embodiment, also provide a kind of method of electromechanical oscillations for the decay electic power system.
The method comprises:
The electric current of rotating speed, voltage and this stator of the rotor of monitoring synchronous alternator;
Continuous measurement by these generator terminals voltage and this generator unit stator electric current to determine the electromagnetic power from this generator of this voltage and current;
Determine the time-derivative by the voltage of generator terminal;
Determine the time-derivative of this generator unit stator electric current;
Rotating speed under the equilibrium mode is determined the deviation of the rotating speed of this measured rotor;
Determine the time-derivative of the rotating speed of this measured rotor;
Then, the signal of the time-derivative value of the deviation of the rotating speed of the time-derivative of the voltage and current that obtains, this generator amature and this rotating speed is sued for peace, to obtain the controlling signal of telecommunication, this signal of telecommunication is provided for voltage transformer with attenuated oscillation.
Technique effect of the present invention is the direct impact on the balance on this generator unit shaft.Constant between the EMB device has hour, this allows the noninertia of this balance to control on the whole.
Be used for providing according to the electromagnetic braking apparatus of the dynamic stability of EPS the following beneficial effect that is better than aforementioned method and apparatus:
Basically the mertialess control of the balance on this generator unit shaft;
The efficient of this device does not depend on voltage level, state and the operational mode of this EPS network;
Can control time and the size of this braking torque;
At GU in emergency circumstances, speed can be reduced to close rapidly this GU;
By the decay electromechanical oscillations of this generator amature of the direct control to the power-balance on this GU axle, and this attenuation process does not impact this EPS power mode.
Claims (11)
1. method for improvement of the dynamic stability of electic power system, described electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and load, and described method comprises: the rotating speed of the rotor of monitoring synchronous alternator; After disturbance is applied to described system, the rotating speed of the rotor of described synchronous alternator is reduced to the rotating speed of stator field, described method is characterised in that the described reduction of the rotating speed of described generator amature comprises: by will being mechanically connected to described generator amature with the electromagnetic brake of described generator shaft and described prime mover shaft coaxial arrangement and being connected to described prime mover rotor with connector, with described generator amature mechanical braking; The voltage of the described generator terminal of continuous measurement and described generator unit stator electric current are to determine the electromagnetic power from the generator of described voltage and current; The electromagnetic power of the described generator that obtains and electromagnetic power before described disturbance are compared; If the electromagnetic power of the described generator that obtains is greater than the electromagnetic power before described disturbance, generate control signal to start described electromagnetic brake, determine braking torque from the electromagnetic power that obtains and the difference of the value between the electromagnetic power before described disturbance, and by determining the rotating speed of described disturbance described generator amature afterwards, and itself and described disturbance value are before compared, come the definite time of using described braking torque of variation from the rotating speed of described generator amature; When described generator power before described disturbance equates, stop described electromagnetic brake when the electromagnetic power of the described generator that reaches impartial between the rotating speed of the described rotor before the actual speed of described rotor and described disturbance and obtaining.
2. method according to claim 1 is characterized in that described mechanical connection comprises described electromagnetic brake is arranged in in following three positions one: on described generator, in described prime mover side, between described generator and described prime mover.
3. method for improvement of the dynamic stability of electic power system, described electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and load, described method comprises: the rotating speed of the rotor of monitoring synchronous alternator, and after disturbance is applied to described system, the rotating speed of the rotor of described synchronous alternator is reduced to the rotating speed of stator field, described method is characterised in that the described reduction of the rotating speed of described generator comprises: by will being mechanically connected to described generator amature with the electromagnetic brake of described generator shaft and described prime mover shaft coaxial arrangement and being connected to described prime mover rotor with connector, with described generator amature mechanical braking, the voltage of the described generator terminal of continuous measurement, the voltage of the described generator terminal that obtains is compared with specific voltage, and described specific voltage is in 65～95% scope of the rated voltage of described generator, if the voltage of the described generator terminal that obtains less than described specific voltage, generates control signal to start described electromagnetic brake, when so carrying out, determine continuously described generator unit stator electric current, determine the electromagnetic power of described generator from measured magnitude of voltage and current value, the value of the described generator electromagnetic power that obtains and the electromagnetic power before described disturbance are compared, determine braking torque from the electromagnetic power that obtains and the difference of the value between the electromagnetic power before described disturbance, rotating speed by determining the described generator amature after described disturbance and itself and value before described disturbance are compared, the time of coming to determine from the variation of the rotating speed of described generator amature the described braking torque of application, when power before described disturbance application equates, stop described electromagnetic brake when the power that reaches impartial between the rotating speed of the described rotor before the actual speed of described rotor and described disturbance and obtaining.
4. method according to claim 3 is characterized in that described mechanical connection comprises described electromagnetic brake is arranged in in following three positions one: at described generating pusher side, in described prime mover side, between described generator and described prime mover.
5. method for improvement of the dynamic stability of electic power system, described electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and load, described method comprises: the rotating speed of the rotor of monitoring synchronous alternator, and after disturbance is applied to described system, the rotating speed of the rotor of described synchronous alternator is reduced to the rotating speed of stator field, described method is characterised in that the described reduction of the rotating speed of described generator amature comprises: by will being mechanically connected to described generator amature with the electromagnetic brake of described generator shaft and described prime mover shaft coaxial arrangement and being connected to described prime mover rotor with connector, with described generator amature mechanical braking, the rotating speed deviation of the described generator amature that detection causes by the disturbance that is applied to described system, and the speed difference between the rotating speed of the rotating speed of determining measured described generator amature and described disturbance described generator amature before, described speed difference and particular value are compared, if described speed difference is greater than described particular value, generate control signal to start described electromagnetic brake, when so carrying out, the voltage of the described generator terminal of continuous measurement and described generator unit stator electric current are to determine the electromagnetic power of described generator from described voltage and current, determine braking torque from the electromagnetic power and the difference between the value of the electromagnetic power before described disturbance that obtain, rotating speed by determining the described generator amature after described disturbance and itself and value before described disturbance are compared, the time of coming to determine from the variation of the rotating speed of described generator amature the described braking torque of application, when power before described disturbance application equates, stop described electromagnetic brake when the power that reaches impartial between the rotating speed of the described rotor before the actual speed of described rotor and described disturbance and obtaining.
6. method according to claim 5 is characterized in that described mechanical connection comprises described electromagnetic brake is arranged in in following three positions one: at described generating pusher side, in described prime mover side, between described generator and described prime mover.
7. method for improvement of the dynamic stability of electic power system, described electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and load, and described method comprises: the rotating speed of the rotor of monitoring synchronous alternator; After disturbance is applied to described system, the rotating speed of the rotor of described synchronous alternator is reduced to the rotating speed of stator field, described method is characterised in that the described reduction of the rotating speed of described generator amature comprises: by will being mechanically connected to described generator amature with the electromagnetic brake of described generator shaft and described prime mover shaft coaxial arrangement and being connected to described prime mover rotor with connector, with described generator amature mechanical braking; The voltage of the described generator terminal of continuous measurement and described generator unit stator electric current are to determine the electromagnetic power of described generator from described voltage and current; The electromagnetic power of the described generator that obtains and the electromagnetic power before described disturbance are compared; If the electromagnetic power of the described generator that obtains is greater than the electromagnetic power before described disturbance, generate control signal to start described electromagnetic brake, when so carrying out, determine braking torque from the electromagnetic power and the difference between the value of the electromagnetic power before described disturbance that obtain, and the rotating speed by determining the described generator amature after described disturbance and itself and value before described disturbance are compared comes variation from the rotating speed of described generator amature to determine the time of the described braking torque of application; When the mechanical output of the described prime mover before the electromagnetic power of the described generator that reaches impartial between the speed of the described rotor before the actual speed of the rotor of described generator and described disturbance and obtaining and described disturbance equates, stop described electromagnetic brake.
8. method that is used for the electromechanical oscillations of decay electic power system, described method comprises: the rotating speed of the rotor of monitoring synchronous alternator and the voltage and current of stator; The voltage of the described generator terminal of continuous measurement and described generator unit stator electric current are to determine the electromagnetic power from the generator of described voltage and current; Determine the time-derivative by the voltage of described generator terminal; Determine the time-derivative of described generator unit stator electric current; Rotating speed under the equilibrium mode is determined the deviation of the rotating speed of measured described generator amature; Determine the time-derivative of the rotating speed of measured described rotor; The signal of the time-derivative of the deviation of the rotating speed of the time-derivative of the voltage that obtains, the time-derivative of described generator unit stator electric current, described generator amature and described rotating speed is sued for peace, control the signal of telecommunication to generate, the described control signal of telecommunication is provided for voltage transformer with attenuated oscillation.
9. one kind for improvement of the dynamic stability of electic power system and be used for the method for the electromechanical oscillations of decay electic power system, described electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and electric loading, described method comprises: the rotating speed of the rotor of monitoring synchronous alternator, and after disturbance is applied to described system, the rotating speed of the rotor of described synchronous alternator is reduced to the rotating speed of stator field, the described reduction that it is characterized in that the rotating speed of described generator amature comprises: by being mechanically connected to described generator amature and described prime mover rotor with the electromagnetic brake of the axle coaxial arrangement of described generator shaft and described prime mover with connector, with described generator amature mechanical braking, the voltage of the described generator terminal of continuous measurement and described generator unit stator electric current, and determine electromagnetic power from the generator of described voltage and current, the electromagnetic power of the described generator that obtains and electromagnetic power before described disturbance are compared, if the electromagnetic power of the described generator that obtains is greater than the electromagnetic power before described disturbance, generate control signal to start described electromagnetic brake, when so carrying out, determine braking torque from the electromagnetic power that obtains and the difference of the value between the electromagnetic power before described disturbance, rotating speed by determining the described generator amature after described disturbance and itself and value before described disturbance are compared, the time of coming to determine from the variation of the rotating speed of described generator amature the described braking torque of application, the electromechanical oscillations of the described electic power system that then decays is determined the time-derivative of the voltage of described generator terminal, determine the time-derivative of described generator unit stator electric current, rotating speed under the equilibrium mode is determined the deviation of the rotating speed of measured described rotor, determine the time-derivative of the rotating speed of measured described rotor, the signal of the time-derivative of the deviation of the rotating speed of the time-derivative of the voltage that obtains and the time-derivative of electric current, described generator amature and described rotating speed is sued for peace, control the signal of telecommunication to generate, the described control signal of telecommunication is provided for voltage transformer with attenuated oscillation.
10. one kind for improvement of the dynamic stability of electic power system and be used for the system of the electromechanical oscillations of decay electic power system, described electic power system comprises a plurality of prime mover and synchronous alternator, power transformer, power circuit, switching device and electric loading, and described system comprises: the generator amature speed probe; the generator amature rotating speed reduces device, be used for after disturbance is applied to described system, the rotating speed of described generator amature being reduced to the rotating speed of stator field, it is electromagnetic brake that described generator amature rotating speed reduces device, described electromagnetic brake comprises brake disc and the electromagnetic system that is formed by magnetic conductor and inductance coil, described dish is arranged in magnetic gap, described system is characterised in that described electromagnetic brake and described generator shaft and described prime mover shaft coaxial arrangement and is mechanically connected to the rotor of described generator amature and described prime mover by connector, described system also comprises for the control unit that generates the electromagnetic braking control signal, described control unit comprises: the generator electromagnetic power determining unit, be used for comparing unit that the generator electromagnetic power after described disturbance and described disturbance electromagnetic power are before compared, and generate the electromagnetic braking enabling signal generation unit of electromagnetic braking enabling signal when being used for electromagnetic power at the described generator that obtains greater than the electromagnetic power before described disturbance, described system also comprises for the voltage sensor of determining by the voltage of described generator terminal, and generator unit stator current sensor, two described transducers all are connected to described control unit, generator amature speed probe, brake torque value and time instrument transformer and power supply also are connected to described control unit, described brake torque value and time instrument transformer have the input of the output that is connected to described control unit and are connected to the output of described inductance coil, and described power sourced electric is connected to described instrument transformer.
11. system according to claim 10, it is characterized in that for described mechanical connection is provided, described electromagnetic brake is arranged in in following three positions one: at described generating pusher side, in described prime mover side, between described generator and described prime mover.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2007127676/09A RU2339144C1 (en) | 2007-07-19 | 2007-07-19 | Method for improving dynamic stability and damping oscillations of electric-power systems and device for its realisation |
| RU2007127676 | 2007-07-19 | ||
| PCT/RU2008/000463 WO2009011615A1 (en) | 2007-07-19 | 2008-07-15 | Method for improving the dynamic stability of electric-power systems and for damping oscillations thereof and a device for carrying out said method |
Publications (2)
| Publication Number | Publication Date |
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| CN101790841A CN101790841A (en) | 2010-07-28 |
| CN101790841B true CN101790841B (en) | 2013-06-05 |
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| CN200880104682.3A Expired - Fee Related CN101790841B (en) | 2007-07-19 | 2008-07-15 | Method for improving the dynamic stability of electric-power systems and for damping oscillations thereof and a device for carrying out said method |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101790841B (en) |
| RU (1) | RU2339144C1 (en) |
| WO (1) | WO2009011615A1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122824B (en) * | 2011-04-11 | 2013-06-19 | 武汉大学 | Method and device for identifying low-frequency oscillation mode parameters of power system |
| DE102011086734B4 (en) | 2011-11-21 | 2023-11-16 | Robert Bosch Gmbh | Method for operating an energy supply unit for an on-board electrical system of a motor vehicle |
| GB2501687B (en) * | 2012-04-30 | 2014-12-10 | Isentropic Ltd | Improvements relating to the transmission of energy |
| US9407187B2 (en) | 2012-06-28 | 2016-08-02 | General Electric Company | System and method for improving response time of a braking unit |
| US9413217B2 (en) | 2012-06-28 | 2016-08-09 | General Electric Company | Electromagnetic braking systems and methods |
| US9601918B2 (en) | 2012-06-28 | 2017-03-21 | General Electric Company | Systems and methods for controlling acceleration of a power generator |
| RU2521768C2 (en) * | 2012-07-20 | 2014-07-10 | Открытое Акционерное Общество "Системный Оператор Единой Энергетической Системы" | Method for determination of synchronous oscillations source |
| RU2508591C1 (en) * | 2012-07-20 | 2014-02-27 | Открытое акционерное общество "Системный оператор Единой энергетической системы" (ОАО "СО ЕЭС") | Device for detection of synchronous vibrations source |
| JP6322195B2 (en) * | 2012-08-31 | 2018-05-09 | シエル・インターナシヨネイル・リサーチ・マーチヤツピイ・ベー・ウイＳｈｅｌｌ Ｉｎｔｅｒｎａｔｉｏｎａｌｅ Ｒｅｓｅａｒｃｈ Ｍａａｔｓｃｈａｐｐｉｊ Ｂｅｓｌｏｔｅｎ Ｖｅｎｎｏｏｔｓｈａｐ | Variable speed drive system, method of operating variable speed drive system, and method of cooling a hydrocarbon stream |
| EP2784271B1 (en) | 2013-03-29 | 2018-07-04 | General Electric Technology GmbH | Steam turbine governing system for maintaining synchronization and process for performing the same |
| CN103995204B (en) * | 2014-05-29 | 2016-12-07 | 国家电网公司 | The on-line monitoring method in a kind of power system forced oscillation source and device |
| RU2576652C1 (en) * | 2014-07-11 | 2016-03-10 | Олег Алексеевич Суханов | Method for control of transient electromechanical processes in electric energy systems |
| CN104539211B (en) * | 2014-12-18 | 2017-08-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Parameter of electric machine discrimination method and device |
| RU2758996C1 (en) * | 2020-12-29 | 2021-11-08 | Публичное акционерное общество "ОДК - Уфимское моторостроительное производственное объединение" (ПАО "ОДК-УМПО") | Method for controlling three-phase synchronous generator |
| CN113721460B (en) * | 2021-07-21 | 2023-09-29 | 广西电网有限责任公司 | Power system stability control method based on probability robust random algorithm |
| CN114876718B (en) * | 2022-06-23 | 2024-03-26 | 西安热工研究院有限公司 | Water turbine upper guide swing degree out-of-standard treatment system and method |
| CN115131736B (en) * | 2022-08-26 | 2022-11-11 | 北京江河惠远科技有限公司 | Self-adaptive remote sensing ultra-high voltage construction full-period disturbance monitoring method and equipment |
| CN115833266B (en) * | 2023-02-14 | 2023-04-21 | 中国科学院电工研究所 | Method for controlling cluster aggregation of grid-following type converter in new energy power system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490841A (en) * | 1981-10-21 | 1984-12-25 | Sound Attenuators Limited | Method and apparatus for cancelling vibrations |
| CN1126389A (en) * | 1994-06-17 | 1996-07-10 | 株式会社东芝 | Variable speed generator-motor apparatus capable of improving accuracy of power system |
| CN1150267A (en) * | 1994-12-22 | 1997-05-21 | 株式会社日立制作所 | Power system stabilizing apparatus |
| RU2295817C2 (en) * | 2005-05-13 | 2007-03-20 | Новосибирский государственный технический университет | Method for increasing dynamic stability of synchronous electric machines |
| EP1782530A1 (en) * | 2004-07-22 | 2007-05-09 | Microgen Energy Limited | Method and apparatus for instability detection and correction in a domestic combined heat and power unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU604119A1 (en) * | 1976-08-02 | 1978-04-25 | Предприятие П/Я Р-6517 | Method of control of synchronous generator excitation |
-
2007
- 2007-07-19 RU RU2007127676/09A patent/RU2339144C1/en not_active IP Right Cessation
-
2008
- 2008-07-15 CN CN200880104682.3A patent/CN101790841B/en not_active Expired - Fee Related
- 2008-07-15 WO PCT/RU2008/000463 patent/WO2009011615A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490841A (en) * | 1981-10-21 | 1984-12-25 | Sound Attenuators Limited | Method and apparatus for cancelling vibrations |
| CN1126389A (en) * | 1994-06-17 | 1996-07-10 | 株式会社东芝 | Variable speed generator-motor apparatus capable of improving accuracy of power system |
| CN1150267A (en) * | 1994-12-22 | 1997-05-21 | 株式会社日立制作所 | Power system stabilizing apparatus |
| EP1782530A1 (en) * | 2004-07-22 | 2007-05-09 | Microgen Energy Limited | Method and apparatus for instability detection and correction in a domestic combined heat and power unit |
| RU2295817C2 (en) * | 2005-05-13 | 2007-03-20 | Новосибирский государственный технический университет | Method for increasing dynamic stability of synchronous electric machines |
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| WO2009011615A1 (en) | 2009-01-22 |
| RU2339144C1 (en) | 2008-11-20 |
| CN101790841A (en) | 2010-07-28 |
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