CN210867552U - System for enhancing sudden change load capacity of gas generator set - Google Patents
System for enhancing sudden change load capacity of gas generator set Download PDFInfo
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- CN210867552U CN210867552U CN201921449732.3U CN201921449732U CN210867552U CN 210867552 U CN210867552 U CN 210867552U CN 201921449732 U CN201921449732 U CN 201921449732U CN 210867552 U CN210867552 U CN 210867552U
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Abstract
The utility model discloses a system for enhancing sudden change load capacity of a gas generator set, which comprises a prime motor, a prime motor controller, an asynchronous motor and a generator, wherein the gas generator set is respectively provided with a torque sensor and a speed sensor, the torque sensor and the speed sensor are respectively connected with the prime motor controller, a three-phase output line of the generator is connected with a UPS, a three-phase output end of the UPS is correspondingly connected with a three-phase input end of an AC voltage regulator, a three-phase output end of the AC voltage regulator is correspondingly connected with a three-phase access end of the asynchronous motor, a group of relay contacts controlled by a first relay group are arranged between the three-phase output end of the AC voltage regulator and the three-phase access end of the asynchronous motor, a first CAN bus for controlling the output of the AC voltage regulator is connected between the prime, and the first CAN bus is connected to the control end of the first relay group through a voltage signal output line.
Description
Technical Field
The utility model relates to a gas generating set technical field, concretely relates to system for reinforcing gas generating set sudden change load capacity.
Background
The gas generator is a new energy generator which uses combustible gas such as liquefied gas, natural gas and the like as a comburent to replace gasoline and diesel oil as engine power.
The existing gas generator set is limited by fuel properties, the sudden loading capacity and the sudden unloading capacity of the gas generator set are generally kept in a lower range of 10% -20%, and the capacity of suddenly increasing a large load and the capacity of suddenly unloading the large load cannot be borne, so that the gas generator set with power which is 3-5 times larger than that of an electric load is often selected. Therefore, on one hand, the volume of the whole gas generator set is increased, and on the other hand, the cost of the gas generator set is also increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a system for strengthen gas generating set sudden change load capacity aims at improving gas generating set to the bearing capacity of load sudden change to reduce gas generating set's volume and cost. The specific technical scheme is as follows:
the utility model provides a system for reinforcing gas generating set sudden change load capacity, includes as gas engine's prime mover, is used for control the prime mover controller of prime mover, connects gradually the asynchronous motor and the generator of prime mover, asynchronous motor's rotor with the rotor of generator all with the output shaft coaxial coupling of prime mover, last torque sensor and the tachometer sensor that is used for detecting the output shaft moment of torsion and the output shaft rotational speed of prime mover of still being provided with respectively of gas generating set, torque sensor and tachometer sensor connect respectively the prime mover controller, be connected with UPS uninterrupted power source on the three-phase output line of generator, UPS uninterrupted power source's three-phase output end corresponds the three-phase input of connecting AC voltage regulator, AC voltage regulator's three-phase output end corresponds and is connected to asynchronous motor's three-phase incoming end, a group of relay contacts controlled by a first relay group are arranged between the three-phase output end of the alternating current voltage regulating device and the three-phase access end of the asynchronous motor, a first CAN bus for controlling the output of the alternating current voltage regulating device is connected between the prime mover controller and the alternating current voltage regulating device, and the first CAN bus is connected to the control end of the first relay group through a voltage signal output line; wherein, the relay quantity of first relay group is three.
In the technical scheme, the prime motor controller detects the output shaft torque and the output shaft rotating speed of the prime motor through the torque sensor and the speed measuring sensor respectively, when the gas generator set is in a sudden loading state, the output shaft torque of the prime motor is increased, and the rotating speed is reduced, so that the prime motor controller sends out a control signal and supplies power to the asynchronous motor through the UPS (uninterrupted power supply) and the AC voltage regulating device, and the asynchronous motor generates a torque in the same direction as the prime motor, so that the rotating speed of the output shaft of the prime motor is increased; when the gas generator set reaches a stable loading state, the torque and the rotating speed of the output shaft of the prime motor are recovered to be normal, the prime motor controller sends out a control signal, and the connection between the alternating current voltage regulating device and the asynchronous motor is disconnected, so that the power supply to the asynchronous motor is stopped.
As a further improvement of the present invention, a dc voltage regulator is connected to a three-phase output line of the generator, the dc voltage regulator is provided with a dc positive terminal, a dc negative terminal and two control signal voltage output terminals, wherein two phase line input terminals of three-phase input terminals of the asynchronous motor are connected to the dc positive terminal and the dc negative terminal respectively, and a set of relay contacts controlled by a second relay group is provided between the two phase line input terminals and the dc positive terminal and the dc negative terminal, and the two control signal voltage output terminals are connected to a control terminal of the second relay group; and the number of the relays of the second relay group is two.
When the gas generator set is in a sudden unloading state, the torque of an output shaft of the prime motor is reduced, and the rotating speed is increased, so that the prime motor controller sends a control signal, and outputs direct-current voltage through the direct-current voltage regulating device, the direct-current voltage is loaded to two phase line access ends in three-phase access ends of the asynchronous motor, and a direct-current excitation voltage is supplied to a stator winding of the asynchronous motor, so that energy consumption braking is realized, and the rotating speed of the output shaft of the prime motor is reduced; when the gas generator set reaches a stable loading state, the torque and the rotating speed of the output shaft of the prime motor are recovered to be normal, the prime motor controller sends out a control signal to disconnect the direct-current voltage regulating device from the asynchronous motor, and therefore the energy-consumption braking of the asynchronous motor is stopped.
As the utility model discloses well alternating current regulator's an preferred scheme, alternating current regulator is including the three pairs of reverse parallelly connected thyristors of difference that are used for passing through phase line electric current, just the one end of reverse parallelly connected thyristor does direct current regulator's input, the other end do direct current regulator's output.
The alternating current voltage regulating device adopts the thyristors in the reverse parallel connection, so that each pair of thyristors in the reverse parallel connection CAN realize the bidirectional conduction of alternating current under the triggering of a CAN bus signal.
Additionally, the utility model discloses alternating current voltage regulator's three-phase output with be provided with a set of relay contact by first relay group control between asynchronous motor's the three-phase incoming end to utilize CAN bus signal to control first relay group, thereby played the effect of cutting off or putting through UPS uninterrupted power source.
As the utility model discloses well direct current regulator's a preferred scheme, direct current regulator includes step-down module, rectification filter module and the linear voltage stabilizing module that connects gradually according to the order from inputing to output.
As a further improvement, the system for enhancing sudden change load capacity of a gas generator set of the present invention further comprises an asynchronous generator control device for converting the asynchronous motor into an asynchronous generator, wherein the asynchronous generator control device comprises three groups of capacitors connected to a three-phase access terminal of the asynchronous motor and connected according to a delta connection or a star connection, and a group of relay contacts controlled by a third relay group is arranged between the three-phase access terminal and the three groups of capacitors; and the number of the relays of the third relay group is three.
The asynchronous generator control device is arranged, so that the asynchronous motor can be used as an asynchronous generator, and power can be supplied to core equipment under the condition that the main generator fails.
Preferably, the asynchronous motor in the present invention is an asynchronous water-cooled motor.
The asynchronous motor is preferably an asynchronous water-cooled motor, the overload capacity and the heat dissipation capacity of the asynchronous water-cooled motor are better, and the asynchronous water-cooled motor is beneficial to a gas generator set to adapt to severe working conditions with larger heat productivity caused by frequent and sudden loading and unloading of the gas generator set.
Preferably, the relay in the present invention is a solid state relay.
A control method of a system for enhancing sudden load capacity of a gas generator set comprises the following steps:
(1) an asynchronous motor is arranged in the gas generator set, and a rotor of the asynchronous motor is coaxially connected with a rotor of a generator and an output shaft of a prime mover in the gas generator set;
(2) a torque sensor and a speed measuring sensor for detecting the torque and the rotating speed of an output shaft of a prime motor are respectively arranged in the gas generator set;
(3) the UPS is connected with a three-phase output circuit of the generator, and the AC voltage regulating device is connected with the UPS;
(4) setting the maximum allowable torque increase rate of the engine to be X%, and setting the maximum allowable unloaded torque variation of the engine to be M%;
(5) establishing the following judgment formula for identifying the load state of the gas generator set:
β＝(Tn+1－Tn)÷Tn×100％；
where β is the percent change in torque of the engine, Tn+1And TnThe engine output shaft torque of the next time end point and the engine output shaft torque of the previous time end point in the time interval from starting to stopping of the unit operation are respectively obtained;
(6) judging the load state of the gas generator set according to the following method, wherein the gas generator set is in a sudden loading state when the β value is larger than X%, the gas generator set is in a sudden unloading state when the β value is smaller than M%, and the gas generator set is in a no-load or stable loading state when the β value is between M% and X%;
(7) when the gas generator set is in a sudden loading state, so that the rotating speed of an output shaft of the prime mover is reduced, the UPS and the AC voltage regulator are used for supplying power to the asynchronous motor, and the asynchronous motor generates a torque in the same direction as the prime mover, so that the rotating speed of the output shaft of the prime mover is increased; when the gas generator set reaches a stable loading state, the connection between the alternating current voltage regulating device and the asynchronous motor is disconnected, so that power supply to the asynchronous motor is stopped.
As a further improvement, the utility model discloses a control method of system of reinforcing gas generating set sudden change load capacity still includes following method:
(1) a direct current voltage regulating device connected with a three-phase output circuit of the generator is arranged;
(2) when the gas generator set is in a sudden unloading state, so that the rotating speed of the output shaft of the prime mover is increased, the direct-current voltage is output by the direct-current voltage regulating device and loaded to two phase line access ends of three-phase access ends of the asynchronous motor, and a direct-current excitation voltage is supplied to a stator winding of the asynchronous motor, so that energy consumption braking is realized, and the rotating speed of the output shaft of the prime mover is reduced; when the gas generator set reaches a stable loading state, the connection between the direct current voltage regulating device and the asynchronous motor is disconnected, and therefore the energy consumption braking of the asynchronous motor is stopped.
As a further improvement, the control method of the system for enhancing the sudden change load capacity of the gas generator set of the present invention further comprises the step of selecting the type of the asynchronous motor, wherein the selection of the type of the asynchronous motor comprises the selection of the rated rotating speed of the asynchronous motor and the selection of the rated power of the asynchronous motor; the rated rotating speed of the asynchronous motor is selected to be the same as the rated rotating speed of the generator, and the rated power of the asynchronous motor is selected according to the following method:
(1) establishing an output torque change curve of the engine of the gas generator set during slow loading through a test;
(2) establishing an output torque change curve of the engine of the gas generator set during sudden loading through a test;
(3) establishing an output torque change curve of the engine when the gas generator set is suddenly unloaded through a test;
(4) determining the rated torque of the required asynchronous motor according to the three torque change curves;
(5) the rated power of the asynchronous motor is obtained according to the following formula:
TN＝9550×Pn÷nN，
wherein, TNFor rated torque of asynchronous motors, PnFor rated power of asynchronous motor, nNThe rated rotating speed of the asynchronous motor.
The utility model has the advantages that:
first, the utility model discloses a system of reinforcing gas generating set sudden change load capacity, when gas generating set was in the sudden loading state, can be the asynchronous motor power supply through UPS uninterrupted power source and the interchange pressure regulating device of connecting on the three-phase output line of generator, asynchronous motor produced one with the syntropy moment of torsion of prime mover for the output shaft rotational speed of prime mover increases, has improved the bearing capacity of gas generating set to the load sudden increase from this.
Second, the utility model discloses a system of reinforcing gas generating set sudden change load capacity, when gas generating set was in the state of uninstalling suddenly, can be through the direct current voltage regulator output direct current voltage who connects on the three-phase output line of generator, give direct current excitation voltage of asynchronous motor's stator winding to realize the dynamic braking, and make the output shaft speed of prime mover reduce, improved the bearing capacity of gas generating set to the load reduces suddenly from this.
Third, the utility model discloses a system of reinforcing gas generating set sudden change load capacity through setting up asynchronous generator controlling means for asynchronous motor can regard as asynchronous generator to use, thereby has realized providing the power for core equipment under the condition of main generator trouble.
Fourth, the utility model discloses a system of reinforcing gas generating set sudden change load capacity is preferred asynchronous water-cooled motor with asynchronous motor, and its overload capacity and heat-sinking capability are better, are favorable to gas generating set to adapt to its frequent sudden loading and the great abominable operating mode of calorific capacity that results in more.
Fifth, the utility model discloses a system of reinforcing gas generating set sudden change load capacity has optimized gas generating set's design and lectotype through the output torque variation curve of establishing gas generating set engine under slow loading, sudden loading and the sudden unloading operating mode to the adaptability of gas generating set to the sudden change load has further been improved.
Drawings
Fig. 1 is a schematic diagram of the whole set of the system for enhancing sudden load capacity of the gas generator set of the present invention;
fig. 2 is a schematic circuit diagram of a system for enhancing sudden load capability of a gas generator set according to the present invention;
FIG. 3 is a large view of the left half of FIG. 1;
FIG. 4 is a schematic view of the right half of FIG. 1;
FIG. 5 is a graphical illustration of the output torque profile of an engine with a slow load of a conventional gas turbine generator set;
FIG. 6 is a graphical illustration of the output torque profile of an engine during sudden loading of a conventional gas turbine generator set;
FIG. 7 is a graphical illustration of the output torque profile of an engine during a sudden unloading of a conventional gas turbine generator set;
fig. 8 is a schematic diagram of the system for enhancing sudden load capacity of a gas generator set according to the present invention, in which a closed-loop speed regulation method is used to enhance sudden load capacity;
FIG. 9 is a schematic diagram of a unit under sudden loading and controlled by a closed loop speed regulation system;
FIG. 10 is a schematic diagram of a unit under sudden unloading control using a closed loop governing system;
FIG. 11 is a schematic wiring diagram for dynamic braking of an asynchronous motor;
fig. 12 is a schematic diagram of three groups of capacitors connected in delta connection on three phases of a stator of an asynchronous generator.
In the figure: g is a generator, M is an asynchronous motor, ECU is a prime mover controller (engine ECU), K1, K2 and K3 are three solid-state relays in a third relay group, K4, K5 and K6 are three solid-state relays in a first relay group, and K7 and K8 are three solid-state relays in a second relay group.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1:
fig. 1 to 12 show an embodiment of a system for enhancing sudden load capability of a gas generator set according to the present invention, which includes a prime mover as a gas engine, a prime mover controller for controlling the prime mover, and an asynchronous motor and a generator sequentially connected to the prime mover, wherein the rotor of the asynchronous motor and the rotor of the generator are coaxially connected to an output shaft of the prime mover, the gas generator set is further provided with a torque sensor and a speed sensor for detecting an output shaft torque and an output shaft speed of the prime mover, the torque sensor and the speed sensor are respectively connected to the prime mover controller, a three-phase output line of the generator is connected to a UPS uninterruptible power supply, a three-phase output end of the UPS uninterruptible power supply is correspondingly connected to a three-phase input end of an ac voltage regulator, a three-phase output end of the voltage regulator ac voltage regulator is correspondingly connected to a three-phase input end, a group of relay contacts controlled by a first relay group are arranged between the three-phase output end of the alternating current voltage regulating device and the three-phase access end of the asynchronous motor, a first CAN bus for controlling the output of the alternating current voltage regulating device is connected between the prime mover controller and the alternating current voltage regulating device, and the first CAN bus is connected to the control end of the first relay group through a voltage signal output line; wherein, the relay quantity of first relay group is three.
In the technical scheme, the prime motor controller detects the output shaft torque and the output shaft rotating speed of the prime motor through the torque sensor and the speed measuring sensor respectively, when the gas generator set is in a sudden loading state, the output shaft torque of the prime motor is increased, and the rotating speed is reduced, so that the prime motor controller sends out a control signal and supplies power to the asynchronous motor through the UPS (uninterrupted power supply) and the AC voltage regulating device, and the asynchronous motor generates a torque in the same direction as the prime motor, so that the rotating speed of the output shaft of the prime motor is increased; when the gas generator set reaches a stable loading state, the torque and the rotating speed of the output shaft of the prime motor are recovered to be normal, the prime motor controller sends out a control signal, and the connection between the alternating current voltage regulating device and the asynchronous motor is disconnected, so that the power supply to the asynchronous motor is stopped.
As a further improvement of this embodiment, a direct current voltage regulator is connected to a three-phase output line of the generator, the direct current voltage regulator is provided with a direct current positive terminal, a direct current negative terminal, and two control signal voltage output terminals, two of the three-phase input ends of the asynchronous motor are connected to the direct current positive terminal and the direct current negative terminal, a set of relay contacts controlled by a second relay group is provided between the two phase input ends and the direct current positive terminal and the direct current negative terminal, and the two control signal voltage output terminals are connected to the control end of the second relay group; and the number of the relays of the second relay group is two.
When the gas generator set is in a sudden unloading state, the torque of an output shaft of the prime motor is reduced, and the rotating speed is increased, so that the prime motor controller sends a control signal, and outputs direct-current voltage through the direct-current voltage regulating device, the direct-current voltage is loaded to two phase line access ends in three-phase access ends of the asynchronous motor, and a direct-current excitation voltage is supplied to a stator winding of the asynchronous motor, so that energy consumption braking is realized, and the rotating speed of the output shaft of the prime motor is reduced; when the gas generator set reaches a stable loading state, the torque and the rotating speed of the output shaft of the prime motor are recovered to be normal, the prime motor controller sends out a control signal to disconnect the direct-current voltage regulating device from the asynchronous motor, and therefore the energy-consumption braking of the asynchronous motor is stopped.
As a preferred scheme of the ac voltage regulating device in this embodiment, the ac voltage regulating device includes three pairs of thyristors connected in reverse parallel respectively for passing through phase line current, and one end of the thyristor connected in reverse parallel is an input end of the dc voltage regulating device, and the other end is an output end of the dc voltage regulating device.
The alternating current voltage regulating device adopts the thyristors in the reverse parallel connection, so that each pair of thyristors in the reverse parallel connection CAN realize the bidirectional conduction of alternating current under the triggering of a CAN bus signal.
In addition, this embodiment is in be provided with a set of relay contact by first relay group control between the three-phase output of AC voltage regulator device and asynchronous motor's the three-phase incoming end to utilize CAN bus signal to control first relay group, thereby played the effect of cutting off or putting through UPS uninterrupted power source.
As a preferable scheme of the dc voltage regulating device in this embodiment, the dc voltage regulating device includes a voltage reduction module, a rectification filter module, and a linear voltage stabilization module, which are sequentially connected in order from input to output.
As a further improvement, the system for enhancing sudden load capability of a gas generator set of the present embodiment further includes an asynchronous generator control device for converting the asynchronous motor into an asynchronous generator, the asynchronous generator control device includes three groups of capacitors connected to three-phase access terminals of the asynchronous motor and connected in a delta connection or a star connection, and a group of relay contacts controlled by a third relay group is disposed between the three-phase access terminals and the three groups of capacitors; and the number of the relays of the third relay group is three.
The asynchronous generator control device is arranged, so that the asynchronous motor can be used as an asynchronous generator, and power can be supplied to core equipment under the condition that the main generator fails.
Preferably, the asynchronous motor in this embodiment is an asynchronous water-cooled motor.
The asynchronous motor is preferably an asynchronous water-cooled motor, the overload capacity and the heat dissipation capacity of the asynchronous water-cooled motor are better, and the asynchronous water-cooled motor is beneficial to a gas generator set to adapt to severe working conditions with larger heat productivity caused by frequent and sudden loading and unloading of the gas generator set.
Preferably, the relay in this embodiment is a solid-state relay.
Example 2:
a control method using the system for enhancing sudden load capability of a gas generator set of embodiment 1, comprising the following steps:
(1) an asynchronous motor is arranged in the gas generator set, and a rotor of the asynchronous motor is coaxially connected with a rotor of a generator and an output shaft of a prime mover in the gas generator set;
(2) a torque sensor and a speed measuring sensor for detecting the torque and the rotating speed of an output shaft of a prime motor are respectively arranged in the gas generator set;
(3) the UPS is connected with a three-phase output circuit of the generator, and the AC voltage regulating device is connected with the UPS;
(4) setting the maximum allowable torque increase rate of the engine to be X%, and setting the maximum allowable unloaded torque variation of the engine to be M%;
(5) establishing the following judgment formula for identifying the load state of the gas generator set:
β＝(Tn+1－Tn)÷Tn×100％；
where β is the percent change in torque of the engine, Tn+1And TnThe engine output shaft torque of the next time end point and the engine output shaft torque of the previous time end point in the time interval from starting to stopping of the unit operation are respectively obtained;
(6) judging the load state of the gas generator set according to the following method, wherein the gas generator set is in a sudden loading state when the β value is larger than X%, the gas generator set is in a sudden unloading state when the β value is smaller than M%, and the gas generator set is in a no-load or stable loading state when the β value is between M% and X%;
(7) when the gas generator set is in a sudden loading state, so that the rotating speed of an output shaft of the prime mover is reduced, the UPS and the AC voltage regulator are used for supplying power to the asynchronous motor, and the asynchronous motor generates a torque in the same direction as the prime mover, so that the rotating speed of the output shaft of the prime mover is increased; when the gas generator set reaches a stable loading state, the connection between the alternating current voltage regulating device and the asynchronous motor is disconnected, so that power supply to the asynchronous motor is stopped.
As a further improvement, the control method of the system for enhancing sudden load capability of the gas generator set of the embodiment further includes the following steps:
(1) a direct current voltage regulating device connected with a three-phase output circuit of the generator is arranged;
(2) when the gas generator set is in a sudden unloading state, so that the rotating speed of the output shaft of the prime mover is increased, the direct-current voltage is output by the direct-current voltage regulating device and loaded to two phase line access ends of three-phase access ends of the asynchronous motor, and a direct-current excitation voltage is supplied to a stator winding of the asynchronous motor, so that energy consumption braking is realized, and the rotating speed of the output shaft of the prime mover is reduced; when the gas generator set reaches a stable loading state, the connection between the direct current voltage regulating device and the asynchronous motor is disconnected, and therefore the energy consumption braking of the asynchronous motor is stopped.
As a further improvement, the control method of the system for enhancing sudden load capability of the gas generator set of the embodiment further comprises the step of selecting the asynchronous motor, wherein the selection of the asynchronous motor comprises the selection of the rated rotating speed of the asynchronous motor and the selection of the rated power of the asynchronous motor; the rated rotating speed of the asynchronous motor is selected to be the same as the rated rotating speed of the generator, and the rated power of the asynchronous motor is selected according to the following method:
(1) establishing an output torque change curve of the engine of the gas generator set during slow loading through a test;
(2) establishing an output torque change curve of the engine of the gas generator set during sudden loading through a test;
(3) establishing an output torque change curve of the engine when the gas generator set is suddenly unloaded through a test;
(4) determining the rated torque of the required asynchronous motor according to the three torque change curves;
(5) the rated power of the asynchronous motor is obtained according to the following formula:
TN＝9550×Pn÷nN，
wherein, TNFor rated torque of asynchronous motors, PnFor rated power of asynchronous motor, nNThe rated rotating speed of the asynchronous motor.
Example 3:
the principle of the system and the control method for enhancing sudden change load capacity of the gas generator set according to the present invention will be further described with reference to the accompanying drawings:
FIG. 5 is a schematic diagram of the output torque curve of the engine of the conventional gas-turbine generator set under slow loading, where t1～tnThe time period represents the time from start to stop of the unit. It is seen from the figure that the output torque variation curve is substantially linear.
As shown in fig. 6, which is a schematic diagram of an output torque variation curve of an engine of a conventional gas generator set when suddenly loaded, it is seen from the diagram that the output torque of the engine of the generator set when suddenly loaded is greatly increased when the torque variation condition of the generator set when suddenly loaded is within a time period from t2 to t 3.
Fig. 7 is a schematic diagram showing the output torque variation curve of the engine when the conventional gas generator set is suddenly unloaded. From the figure, the torque change condition of the unit during sudden unloading in the time period from t2 to t3 is seen, the output torque of the engine of the unit during sudden unloading is greatly reduced, and even a reverse torque is generated.
FIG. 8 is a schematic diagram showing a control system (prime mover controller) employing a closed loop governing method to enhance its sudden loading capability; fig. 9 is a schematic diagram of a unit controlled by a closed-loop speed regulating system during sudden loading. Because the engine has a certain reduction in rotation speed under the condition of sudden loading, the AC voltage regulator is supplied by the UPS at the momentAnd the rated voltage U1 is an AC voltage regulating device composed of power electronic devices such as thyristors. The ac voltage regulating device can change the voltage U1 to different variable voltages Ux according to the magnitude of the control signal e. The control signal being a given signal e0And a feedback signal enThe difference between them. Fig. 8 shows that the output voltage Ux ═ U1Time (corresponding to a certain control signal e) corresponds to the rated torque TNThe rotational speed is n 2; when the torque increases to TNAfter that, without feedback the rotational speed would drop to n2 'along the artificial mechanical characteristic corresponding to U1', the speed drop being extremely severe. In the closed loop governor system shown in FIG. 9, the reduction in rotational speed due to unit loading is proportional to the e of the rotational speednWill also decrease. e (═ e)0-en) The value of the motor is automatically increased, so that the output voltage is increased, and the motor generates a larger torque in the same direction as the running direction of the engine, so as to increase the rotating speed of the engine to the rated rotating speed. The stator voltage is smoothly changed in a closed loop system, i.e. the rotation speed of the asynchronous motor can be smoothly regulated.
Fig. 10 is a schematic diagram of a unit controlled by a closed-loop speed regulating system during sudden unloading, and fig. 11 is a schematic diagram of wiring for dynamic braking of an asynchronous motor; the rotating speed of the unit can be greatly increased under the condition of sudden unloading of the unit, the asynchronous motor is required to perform dynamic braking wiring at the moment, the magnitude of a rotor series resistance or a stator exciting current is changed during dynamic braking, and in order to rapidly brake the winding rotor asynchronous motor in the dynamic braking, the stator direct current exciting current I of the asynchronous motor and a series resistance R of a rotor circuit need to be calculatedΩ；
Stator direct current excitation current I ═ 2-3I0；
In the above formula, I0Is the no-load current of the asynchronous motor;
is generally preferred to0＝(0.2～0.5)I1N；
In the above formula, I1NRated current for the stator;
series resistance
In the above formula, E2NThe value of the induced electromotive force between the two collecting rings when the rotor is locked can be found by a product catalog; wherein I2NThe value of the rated current of the rotor can be found by a product catalog; r2 is the resistance of each phase winding of the rotor;
resistance of each phase winding of rotor
In the above formula, SNFor rated slip, E2NInduced electromotive force between the two collecting rings when the rotor is locked; i is2NRated current for the rotor;
based on the DC exciting current I of the stator of the asynchronous motor and the series resistance R of the rotor circuitΩThe maximum braking torque T that can be achieved by the asynchronous motor can be calculatedmT＝(1.25～2.2)TN。
Because the rotating speed of the engine rises to a certain extent under the condition of sudden unloading, the voltage regulating device is provided with a rated U1 through the UPS, and the voltage regulating device adopts a direct current voltage regulating device consisting of power electronic devices such as a thyristor and the like. The dc voltage regulating device can change the dc voltage U1 to different variable voltages Ux according to the magnitude of the control signal e. The control signal being a given signal e0And a feedback signal enThe difference between them. It can be seen from fig. 8 that when the output voltage Ux ═ U'1Time (corresponding to a certain control signal e) corresponds to the rated load TNThe rotational speed of time is n2(ii) a When the load increases to 0, the engine speed increases, and the asynchronous motor speed also increases. In the closed loop governor system shown in FIG. 10, the increase in rotational speed due to unit unloading is proportional to the e of the rotational speednWill also increase. E (═ E)c-en) The value of (a) is automatically decreased to increase the output voltage, and the motor generates a large braking torque opposite to the engine torque to stabilize the engine speed to the rated speed. The braking torque of the asynchronous motor can be smoothly adjusted by smoothly changing the stator excitation voltage in a closed-loop system.
FIG. 12 is a schematic diagram of three groups of capacitors connected in a delta connection on three phases of a stator of an asynchronous generator; when the prime mover (gas engine or gas turbine) drives the asynchronous generator to operate, three groups of capacitors in a triangular shape or a star shape can be connected to three phases of a stator of the asynchronous generator. The capacitor bank can then supply the reactive power required for the asynchronous motor to generate electricity, i.e. the field current required to build up the magnetic field. The wiring diagram of the capacitor when connected in a delta with the stator of the asynchronous motor is shown in figure three. From the above, the self-excited power generation of the asynchronous motor is mainly performed by supplying a capacitor to the stator winding with a capacitive current in front of the electromotive force E of the stator, which current can establish a magnetic field required for the self-excited power generation. When the capacitors C are connected in a triangular configuration, the capacitance C is selected with reference to the following equation (based on the motor nominal line voltage UNWhen the exciting current of the motor is approximate to I0The current flowing through the capacitor C is
Selection).
In the above formula, C is the capacitance (uF) of each phase when connected in a triangle; i is0The excitation current (A) of the motor can be measured by experiment, or I is taken0＝0.3I1N(ii) a Wherein f is1Is a rated frequency; u shapeNThe motor is rated for line voltage.
Asynchronous motors can be used as backup generators as asynchronous motors because the power is less large than the main generator. The core equipment can only be supplied with power in case of failure of the main generator.
Fig. 2 is a schematic circuit diagram of a system for enhancing sudden load capability of a gas generator set in the present embodiment; the prime motor drives the asynchronous motor and the synchronous generator to operate, the rotating speed of the prime motor is reduced or stopped to a certain extent in the process of sudden loading, at the moment, the alternating current voltage regulating device reads the torque and the rotating speed of the prime motor from a prime motor controller (engine ECU) through a CAN bus, and outputs a signal to connect K4.K5.K6 (solid state relay) so that a contact of the alternating current voltage regulating device is conducted and a rated voltage is supplied to the alternating current voltage regulating device through a UPS (uninterrupted power supply), the alternating current voltage regulating device supplies a three-phase voltage to the asynchronous motor so that the asynchronous motor generates a torque in the same direction as that of the engine, and the K4.K5.K6 (solid state relay. When the engine is suddenly unloaded, the rotating speed of the prime motor rises, at the moment, the direct-current pressure regulating device reads the rotating speed and the torque of the engine from the engine ECU through the CAN bus, the direct-current voltage is output through the direct-current pressure regulating device and a signal is output to K7.K8 (a solid-state relay), at the moment, energy consumption braking is carried out on a direct-current excitation voltage of the stator winding, and K7.K8 is disconnected until the rotating speed of the engine tends to be stable through closed-loop regulation. When the motor is switched on, k1.k2.k3, the asynchronous motor becomes an asynchronous generator and the voltage of the asynchronous generator can be regulated by external control. The switch is a one-way conduction switch.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a system for reinforcing gas generating set sudden change load capacity, its characterized in that includes as gas engine's prime mover, is used for control the prime mover controller of prime mover, connects gradually the asynchronous machine and the generator of prime mover, asynchronous machine's rotor with the rotor of generator all with the output shaft coaxial coupling of prime mover, gas generating set is last still to be provided with the torque sensor and the tachometer sensor that are used for detecting the output shaft moment of torsion and the output shaft rotational speed of prime mover respectively, torque sensor and tachometer sensor connect respectively the prime mover controller, be connected with UPS uninterrupted power source on the three-phase output line of generator, UPS uninterrupted power source's three-phase output corresponds the three-phase input of connecting AC voltage regulator, AC voltage regulator's three-phase output corresponds and is connected to asynchronous machine's three-phase incoming end, a group of relay contacts controlled by a first relay group are arranged between the three-phase output end of the alternating current voltage regulating device and the three-phase access end of the asynchronous motor, a first CAN bus for controlling the output of the alternating current voltage regulating device is connected between the prime mover controller and the alternating current voltage regulating device, and the first CAN bus is connected to the control end of the first relay group through a voltage signal output line; wherein, the relay quantity of first relay group is three.
2. The system for enhancing sudden change load capacity of a gas generator set according to claim 1, wherein a direct current voltage regulator is connected to a three-phase output line of the generator, the direct current voltage regulator is provided with a direct current positive terminal, a direct current negative terminal and two control signal voltage output terminals, two of three-phase input ends of the asynchronous motor are connected to the direct current positive terminal and the direct current negative terminal respectively, a set of relay contacts controlled by a second relay set is arranged between the two phase input ends and the direct current positive terminal and the direct current negative terminal, and the two control signal voltage output terminals are connected to a control end of the second relay set; and the number of the relays of the second relay group is two.
3. The system for enhancing sudden load capability of a gas generator set according to claim 2, wherein the ac voltage regulator comprises three pairs of thyristors connected in reverse parallel for passing through the phase line current, and one end of the thyristors connected in reverse parallel is an input end of the dc voltage regulator, and the other end is an output end of the dc voltage regulator.
4. The system for enhancing sudden load capacity of the gas generator set according to claim 2, wherein the direct current voltage regulating device comprises a voltage reduction module, a rectification filter module and a linear voltage regulation module which are sequentially connected from input to output.
5. The system for enhancing sudden load capacity of a gas generator set according to claim 1, further comprising an asynchronous generator control device for converting the asynchronous motor into an asynchronous generator, wherein the asynchronous generator control device comprises three groups of capacitors connected to three-phase access terminals of the asynchronous motor and connected in delta connection or star connection, and a group of relay contacts controlled by a third relay group are arranged between the three-phase access terminals and the three groups of capacitors; and the number of the relays of the third relay group is three.
6. The system for enhancing sudden load capability of a gas-fired power plant according to claim 1, wherein the asynchronous motor is an asynchronous water-cooled motor.
7. The system for enhancing sudden load capacity of a gas generator set according to any one of claims 1, 2 and 5, wherein the relay is a solid state relay.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707971A (en) * | 2019-09-03 | 2020-01-17 | 无锡法尔胜悦能动力有限公司 | System for enhancing sudden load capacity of gas generator set and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707971A (en) * | 2019-09-03 | 2020-01-17 | 无锡法尔胜悦能动力有限公司 | System for enhancing sudden load capacity of gas generator set and control method |
| CN110707971B (en) * | 2019-09-03 | 2024-09-10 | 无锡法尔胜悦能动力有限公司 | System for enhancing abrupt load capacity of gas generator set and control method |
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