CN214177192U - Generating set and generator control system - Google Patents
Generating set and generator control system Download PDFInfo
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- CN214177192U CN214177192U CN202022246214.0U CN202022246214U CN214177192U CN 214177192 U CN214177192 U CN 214177192U CN 202022246214 U CN202022246214 U CN 202022246214U CN 214177192 U CN214177192 U CN 214177192U
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Abstract
The utility model relates to a power equipment's technical field particularly, relates to a generating set and generator control system. The generator comprises a generator body and a topology control unit. The generator body is provided with a stator winding. The topology control unit is used for controlling the connection mode of the stator winding. When the wind speed is low, the rotating speed of the generator rotor is low. At this time, the voltage induced by the stator winding is insufficient, so that the voltage generated by the generator cannot be connected to the grid.At this time, the topology control unit switches the connection mode of the stator windings to the star connection mode. The voltage output by the stator winding being boosted to a voltage induced in the stator winding
And the output voltage of the generator reaches the standard of grid-connected voltage. The generator set enables the stator to be connected to the grid when the rotating speed is low, so that the working rotating speed range of the generator is wider, and the adaptability is stronger.
Description
Technical Field
The utility model relates to a power equipment's technical field particularly, relates to a generating set and generator control system.
Background
The asynchronous generator has three power generation modes of sub-synchronization, synchronization and super-synchronization, and the synchronous operation of a stator and a power grid is realized by adjusting the amplitude, the frequency and the like of each time through a frequency converter. Under the synchronous and super-synchronous operation modes, most of electric energy is directly sent out by the stator in a grid-connected mode, and the generating efficiency is extremely high in the two operation modes. However, the inherent lowest grid-connected rotating speed exists, and the grid-connected voltage of the stator is the voltage of a power grid, so that the regulation is inconvenient, and the performance of the unit is insufficient when the unit operates at low power. Specifically, when the rotor speed is lower than the minimum grid-connected speed, the grid connection cannot be performed due to insufficient voltage generated by the generator. Therefore, the rotating speed range of the generator set capable of being connected to the grid is narrow, the generator set is frequently disconnected from the grid, and the productivity is low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a generating set and generator control system, its connected mode that can switch stator winding makes it still can provide the voltage that accords with the standard of being incorporated into the power networks when the rotor low-speed.
The embodiment of the utility model discloses a realize through following technical scheme:
a generator set comprises a generator body and a topology control unit; the generator body is provided with a stator winding; the topology control unit is used for controlling the connection mode of the stator winding.
Further, the topology control unit comprises a star-shaped switch and a triangle-shaped switch; when the star-shaped change-over switch is switched on and the triangular change-over switch is switched off, the stator windings are in star connection; when the triangular change-over switch is switched on and the star-shaped change-over switch is switched off, the stator windings are in triangular connection.
Further, the star-shaped switch and the triangular switch are both contactors.
Furthermore, the star-shaped change-over switch and the triangular change-over switch are respectively provided with two star-shaped change-over switches and two triangular change-over switches; the two star-shaped change-over switches are connected in parallel; the two triangular change-over switches are connected in parallel.
A generator control system comprises a working condition monitoring unit, a topology control unit and a generator; the generator comprises a rotor and a stator; the working condition monitoring unit is used for monitoring the rotation working condition of the rotor; the topology control unit is connected to the stator winding; and the topology control unit is used for controlling the connection mode of the stator winding according to the monitoring data of the working condition monitoring unit.
Further, the working condition monitoring unit comprises a rotating speed monitor; the rotational speed monitor is used for monitoring the rotational speed of the rotor.
Further, the working condition monitoring unit comprises a flow rate monitor; the flow rate monitor is used for monitoring the flow rate of the fluid pushing the rotor to rotate.
Further, the fluid is a gas stream or a water stream.
A generator control method, when the rotor speed is greater than its lowest synchronization speed, the stator winding switches to the triangular connection; and when the rotating speed of the rotor is less than the lowest grid-connected rotating speed, the stator windings are switched into star connection.
The utility model discloses technical scheme has following advantage and beneficial effect at least:
in the process of wind power generation, when the wind speed is low, the rotating speed of the generator rotor is low. At this time, the voltage induced by the stator winding is insufficient, so that the voltage generated by the generator cannot be connected to the grid. At this time, the topology control unit switches the connection mode of the stator windings to the star connection mode. Based on electrical principles, the stator winding outputtingWith voltage step-up to stator winding induced voltage
And the output voltage of the generator reaches the standard of grid-connected voltage.
When the wind speed is higher, the rotating speed of the generator rotor is higher. The induced voltage of the stator winding has reached the grid-connection voltage standard. At this time, the topology control unit switches the connection mode of the stator windings to the delta connection mode. According to the electrical principle, the voltage output by the stator winding is equal to the induction voltage of the stator winding, so that the output voltage of the generator meets the standard of grid-connected voltage.
The generator set enables the stator to be connected to the grid when the rotating speed is low, so that the working rotating speed range of the generator is wider, and the adaptability is stronger.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of the stator winding and the topology control unit provided by the present invention;
fig. 2 is a schematic diagram of the generator set provided by the present invention.
Icon: the wind power generator comprises a wind wheel 1, a gear box 2, a converter 3, a transformer 4, a generator body 5, a stator winding 51, a topology control unit 6, a star-shaped change-over switch 61 and a triangle change-over switch 62.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example (b):
as shown in fig. 1 and 2, the present invention provides a generator set, which includes a generator body 5 and a topology control unit 6. The generator can be a WT1500 high prototype doubly-fed machine set. The generator body 5 is provided with a rotor and a stator, which is provided with stator windings 51. The topology control unit 6 is used to control the connection of the stator windings 51. The stator windings 51 are connected in a delta connection manner and a star connection manner. The topology control unit 6 is used to switch the two connection modes of the stator winding 51. The generator set also comprises a wind wheel 1, a gear box 2, a converter 3, a transformer 4 and other parts.
In the process of wind power generation, when the wind speed is low, the rotating speed of the generator rotor is low. At this time, the voltage induced in the stator winding 51 is insufficient, so that the voltage generated by the generator cannot be connected to the grid. At this time, the topology control unit 6 switches the connection method of the stator windings 51 to the star connection method. According to the electrical principle, the voltage output by the stator winding 51 is raised to be √ 3 times of the induced voltage of the stator winding 51, so that the output voltage of the generator reaches the standard of grid-connected voltage.
When the wind speed is higher, the rotating speed of the generator rotor is higher. The induced voltage of the stator winding 51 has reached the grid-connection voltage standard. At this time, the topology control unit 6 switches the connection method of the stator winding 51 to the delta connection method. According to the electrical principle, the voltage output by the stator winding 51 is equal to the induced voltage of the stator winding 51, so that the output voltage of the generator meets the grid-connected voltage standard.
For example: the voltage of the power grid (box transformer) is always 690V, and when the stator winding 51 is connected in a delta mode, the winding voltage is 690V. When the stator winding 51 is converted into star connection, the voltage of the box transformer is still 690V, and according to the circuit principle, the induced voltage of the winding only needs 400V at the moment, and the voltage of the generator terminal can reach 690V, so that grid-connected power generation is completed.
The box transformer is always 690V, when the stator winding 51 of the doubly-fed motor is in triangular connection, the voltage of the stator winding 51 is the box transformer voltage, the electromotive force of the internal winding of the generator is 690V, and the corresponding exciting current is 260A. When the doubly-fed motor stator is changed into star connection, the box transformer substation voltage is still 690V. According to the circuit principle, 690V voltage is generated in a star connection mode, the voltage of the stator winding 51 inside the motor is reduced to 400V, the induced potential of the stator winding 51 inside the motor is reduced, the main magnetic flux inside the motor is greatly reduced, the voltage of only 400V needs to be induced, and the exciting current is reduced to 90A (nonlinearity of the electromagnetic relation of the motor). The internal voltage of the motor is reduced, but the iron loss coefficient is not changed, so that the iron loss of the motor is greatly reduced to about 1/3 from 30kw to 10 kw. Due to the reduction of the main magnetic flux of the motor, the open-circuit voltage of the rotor of the doubly-fed motor is also greatly reduced from 2250V to 1300V, while the output capacity of the converter 3 is unchanged and still 690V, so that the grid-connected rotating speed is reduced from 1350rpm to 1000 rpm. The operation rotating speed is reduced, and the mechanical friction loss of the whole unit is synchronously reduced.
The utility model discloses a generating set has following advantage:
the grid-connected rotating speed of the double-fed unit is reduced. In the example, the original grid-connected rotating speed is reduced to 1000rpm from 1350rpm, so that the blades are always in the optimal Cp curve operation, and the wind capturing performance of the unit is improved remarkably at low wind speed.
The intelligent topology-changing operation of the power generation system is realized, so that the whole machine is always operated at the optimal efficiency, and the generated energy of the unit at the medium-low wind speed is improved by increasing the wind capturing capacity of the wind wheel 1 and reducing the mechanical and electrical losses at the rear end.
The mechanical loss of the transmission chain is reduced, the higher the rotating speed is, the higher the friction loss is, the transmission efficiency is reduced under the same power generation power, and the mechanical loss of the transmission chain can be reduced by reducing the rotating speed of the transmission chain.
The electromagnetic loss is reduced, hardware flux weakening is performed on the double-fed generator through structural transformation of a circuit when medium and small power operates, and both the iron loss of the double-fed generator and the excitation loss of a frequency converter are reduced when the wind speed is low.
The self-power consumption of the heat dissipation system of the unit is reduced, and the self-power consumption of the heat dissipation system can be correspondingly reduced because the loss of the gear box 2, the generator and the frequency converter is reduced, so that the generated energy is reduced.
The off-grid frequency is reduced, and the wind generating set can still run in a grid-connected mode at low wind speed due to the fact that the grid-connected rotating speed is reduced, and the total off-grid frequency is reduced.
In the present embodiment, the topology control unit 6 includes a star switch 61 and a triangle switch 62. The star switch 61 and the delta switch 62 may be contactors, or may be other types of switches. When the star changeover switch 61 is turned on and the delta changeover switch 62 is turned off, the stator windings 51 are star-connected. When the delta switch 62 is on and the star switch 61 is off, the stator windings 51 are delta-connected.
When the wind speed is small so that the induced voltage of the stator winding 51 is less than the minimum grid-connection voltage, the star switch 61 is turned on and the delta switch 62 is turned off. At this time, the stator winding 51 is star-connected, and the voltage output by the generator is √ 3 times the induced voltage of the stator winding 51, which satisfies the grid connection requirement.
When the wind speed is large so that the induced voltage of the stator winding 51 reaches the minimum grid-connection voltage, the star switch 61 is turned off and the delta switch 62 is turned on. At this time, the stator windings 51 are connected in a delta shape, and the voltage output by the generator is equal to the induction voltage of the stator windings 51, so that the grid connection requirement is met.
In the present embodiment, two star switches 61 and two delta switches 62 are provided. The two star-shaped switches 61 are connected in parallel; the two triangular shaped switches 62 are also connected in parallel. In actual use, both the star switch 61 and the triangle switch 62 may be damaged. By adopting the mode that the two star-shaped change-over switches 61 are connected in parallel and the two triangle-shaped change-over switches 62 are connected in parallel, when one star-shaped change-over switch 61 or one triangle-shaped change-over switch 62 is damaged, the other star-shaped change-over switch 61 or the other triangle-shaped change-over switch 62 can be put into use in time, and the shutdown caused by the damage of the star-shaped change-over switch 61 or the triangle-shaped change-over switch 62 is avoided.
The utility model also provides a generator control system, including operating mode monitoring unit, topological control unit 6 and generator. The generator includes a rotor and a stator. The working condition monitoring unit is used for monitoring the rotation working condition of the rotor. The topology control unit 6 is connected to the stator windings 51. The topology control unit 6 is used for controlling the connection mode of the stator winding 51 according to the monitoring data of the working condition monitoring unit.
The rotation working condition of the rotor can be the rotation speed of the rotor or the external force pushing the rotor to rotate. The working condition monitoring unit comprises a rotating speed monitor. The rotation speed monitor is used for monitoring the rotation speed of the rotor. The topology control unit 6 controls the connection of the stator windings 51 according to the rotational speed of the rotor. When the rotor speed is high, the topology control unit 6 switches the connection mode of the stator winding 51 to the delta connection mode. When the rotor speed is low, the topology control unit 6 switches the connection mode of the stator windings 51 to the star connection mode.
In this embodiment, the condition monitoring unit includes a flow rate monitor. The flow rate monitor is used for monitoring the flow rate of the fluid pushing the rotor to rotate. The wind driven generator pushes the rotor to rotate through airflow; the hydroelectric generator drives the rotor to rotate through water flow. Thus, the fluid is a gas stream or a water stream.
The flow rate monitor is used to monitor the flow rate of the fluid. The topology control unit 6 controls the connection of the stator windings 51 according to the flow rate of the fluid. When the flow rate of the fluid is high, the topology control unit 6 switches the connection mode of the stator windings 51 to the delta connection mode. When the flow rate of the fluid is low, the topology control unit 6 switches the connection mode of the stator windings 51 to the star connection mode.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A generator set is characterized in that: comprises a generator body (5) and a topology control unit (6); the generator body (5) is provided with a stator winding (51); the topology control unit (6) is used for controlling the connection mode of the stator winding (51);
the topology control unit (6) comprises a star-shaped switch (61) and a triangle-shaped switch (62); when the star switch (61) is on and the delta switch (62) is off, the stator windings (51) are connected in a star shape; when the delta switch (62) is on and the star switch (61) is off, the stator windings (51) are delta connected;
the star-shaped change-over switch (61) and the triangular change-over switch (62) are respectively provided with two; the two star-shaped switching switches (61) are connected in parallel; the two triangular change-over switches (62) are connected in parallel.
2. The generator set of claim 1, wherein: the star-shaped switch (61) and the triangular switch (62) are both contactors.
3. A generator control system is characterized in that: the system comprises a working condition monitoring unit, a topology control unit (6) and a generator; the generator comprises a rotor and a stator; the working condition monitoring unit is used for monitoring the rotation working condition of the rotor; the topology control unit (6) is connected to the stator winding (51); and the topology control unit (6) is used for controlling the connection mode of the stator winding (51) according to the monitoring data of the working condition monitoring unit.
4. A generator control system as claimed in claim 3, wherein: the working condition monitoring unit comprises a rotating speed monitor; the rotational speed monitor is used for monitoring the rotational speed of the rotor.
5. A generator control system as claimed in claim 3, wherein: the working condition monitoring unit comprises a flow rate monitor; the flow rate monitor is used for monitoring the flow rate of the fluid pushing the rotor to rotate.
6. The generator control system of claim 5, wherein: the fluid is a gas stream or a water stream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022246214.0U CN214177192U (en) | 2020-10-10 | 2020-10-10 | Generating set and generator control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022246214.0U CN214177192U (en) | 2020-10-10 | 2020-10-10 | Generating set and generator control system |
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| Publication Number | Publication Date |
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| CN214177192U true CN214177192U (en) | 2021-09-10 |
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| CN202022246214.0U Active CN214177192U (en) | 2020-10-10 | 2020-10-10 | Generating set and generator control system |
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| CN (1) | CN214177192U (en) |
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