CN216248192U - Device is added to experimental frequency of primary control - Google Patents
Device is added to experimental frequency of primary control Download PDFInfo
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- CN216248192U CN216248192U CN202122941870.7U CN202122941870U CN216248192U CN 216248192 U CN216248192 U CN 216248192U CN 202122941870 U CN202122941870 U CN 202122941870U CN 216248192 U CN216248192 U CN 216248192U
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Abstract
According to the primary frequency modulation test frequency adding device, a terminal row of a speed regulator comprises an in-machine terminal, an in-network terminal, an out-machine terminal and an out-network terminal; the device comprises a switch group and an adjustable frequency generating device; the switch group comprises a first switch and a second switch, wherein the first end of the first switch is connected with the outer terminal of the machine, and the second end of the first switch is connected with the inner terminal of the machine; the first end of the second switch is connected with the adjustable frequency generating device, and the second end of the second switch is connected with the second end of the first switch; the internal terminal is also connected with a machine end frequency sampling point of the first control device, and the network internal terminal is also connected with a network measurement frequency sampling point of the first control device. The application provides a device is added to experimental frequency of primary modulation, when the speed regulator debugging is nearly accuse and the manual mode of electricity, the switching process of first switch and second switch, the frequency measurement return circuit frequency measurement breakpoint can not arouse the stator to change or fluctuate, consequently can be high-efficient, undisturbed and safe carry out the primary modulation experiment.
Description
Technical Field
The application relates to the technical field of primary frequency modulation, in particular to a primary frequency modulation test frequency adding device.
Background
With the rapid development of economy, the scale of a power grid in a power system is increased day by day, the requirement of the power grid on frequency is higher and higher, and at the moment, the functions of primary frequency modulation, secondary frequency modulation and even tertiary frequency modulation are more and more important, wherein the function of the primary frequency modulation function of a local unit is particularly important, so that a primary frequency modulation test of the local unit is required.
The problem that a primary frequency modulation test frequency adding device adopted in the prior art is complex and tedious to install and high in safety risk exists.
SUMMERY OF THE UTILITY MODEL
The application provides a device is added to experimental frequency of primary modulation to solve the problem that the installation of current experimental frequency of primary modulation is complicated and the safety risk is high.
The technical scheme adopted by the application is as follows:
a primary frequency modulation test frequency adding device is characterized in that an inner terminal row of a speed regulator cabinet of a hydroelectric generating set comprises an inner terminal, an outer terminal and an outer terminal; the device comprises a switch group and an adjustable frequency generation device;
the switch group comprises a first switch and a second switch, wherein a first end of the first switch is connected with the external terminal, and a second end of the first switch is connected with the internal terminal; the first end of the second switch is connected with an adjustable frequency generating device, and the second end of the second switch is connected with the second end of the first switch;
the internal terminal is also connected with a machine end frequency sampling point of the first control device, and the internal terminal is also connected with a network measurement frequency sampling point of the first control device.
Furthermore, the device also comprises a second control device, the first switch and the second switch in the switch group are both electric control switches, the electric control switches are respectively in communication connection with the second control device, and the second control device is used for controlling the opening and closing of the electric control switches.
Furthermore, a first terminal and a second terminal of the first switch are respectively and correspondingly connected with a first machine outer terminal and a second machine outer terminal through wires, and a third terminal and a fourth terminal of the first switch are respectively and correspondingly connected with a first machine inner terminal and a second machine inner terminal through wires;
and a fifth terminal and a sixth terminal of the second switch are respectively connected with the adjustable frequency generating device through leads, and a seventh terminal and an eighth terminal of the second switch are respectively correspondingly connected with the third terminal and the fourth terminal through leads.
Furthermore, the first off-board terminal and the second off-board terminal are further connected with a secondary side of an outlet voltage transformer of the generator, and the off-grid terminal is connected with a secondary side of the outlet voltage transformer of the main transformer or the grid-connected point near to the grid side.
Furthermore, the first control device is a PID controller of a primary frequency modulation control loop in a speed regulator cabinet of the water-turbine generator set; and the second control device is controlled by a PLC program.
The technical scheme of the application has the following beneficial effects:
the application provides a device is added to primary frequency modulation test frequency, when the speed regulator debugging is nearly accuse and manual mode, the switching process of first switch and second switch, the frequency measurement return circuit frequency measurement breakpoint can not arouse the stator to change or fluctuate, and then realizes high-efficient, undisturbed and safe carrying out primary frequency modulation test.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic connection diagram of a primary frequency modulation test frequency adding device according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for adding a primary frequency modulation test frequency according to an embodiment of the present disclosure;
illustration of the drawings:
wherein, 1-switch group, 11-first switch, 12-second switch, 2-governor terminal row.
Detailed Description
In order to make the technical solutions in the embodiments of the present application better understood and make the above objects, features and advantages of the embodiments of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a schematic connection diagram of a primary frequency modulation test frequency adding device provided in the embodiment of the present application is shown; fig. 2 is a flowchart illustrating a method for adding a primary frequency modulation test frequency according to an embodiment of the present disclosure.
For frequency deviation caused by small load change amplitude and short change period, the speed regulator of the generator is generally adjusted through primary frequency modulation, and the inner terminal row 2 of the speed regulator cabinet of the hydro-turbo generator set comprises an inner terminal, an outer terminal and an outer terminal.
The application provides a device is added to primary frequency modulation test frequency, the device includes switch block 1 and adjustable frequency generating device, switch block 1 includes first switch 11 and second switch 12 as shown in fig. 1, switch block 1 and adjustable frequency generating device are established ties, and the terminal is established ties in proper order outside the machine in speed regulator terminal row 2, switch block 1 and the interior terminal in speed regulator terminal row 2.
The method specifically comprises the following steps: a first end of the first switch 11 is connected with an external terminal, and a second end of the first switch 11 is connected with an internal terminal; a first terminal of the second switch 12 is connected to the adjustable frequency generating device, and a second terminal of the second switch 12 is connected to a second terminal of the first switch 11. The number of terminals included in the first end and the second end of the first switch 11 and the first end and the second end of the second switch 12 correspond to each other, and the number of terminals in each switch can be determined according to the number of terminals inside and outside the governor terminal row 2. For example, in the present embodiment, four terminals in the first switch 11 are shown below, and may correspond to two internal terminals or two external terminals in the connection terminal row. Of course, switches having more than four terminals may be used according to actual requirements.
Further, as shown in fig. 1, which is a schematic diagram of a connection relationship of the primary frequency modulation test frequency adding apparatus provided in the embodiment of the present application, each of the first switch 11 and the second switch 12 includes four terminals. A first terminal and a second terminal of the first switch 11 are respectively and correspondingly connected with a first machine outer terminal and a second machine outer terminal through conducting wires, and a third terminal and a fourth terminal of the first switch 11 are respectively and correspondingly connected with a first machine inner terminal and a second machine inner terminal through conducting wires; the fifth terminal and the sixth terminal of the second switch 12 are respectively connected with the adjustable frequency generating device through conducting wires, and the seventh terminal and the eighth terminal of the second switch 12 are respectively correspondingly connected with the third terminal and the fourth terminal through conducting wires.
The first external terminal and the second external terminal are also connected with the secondary side of the generator outlet voltage transformer, and the off-grid terminal is connected with the secondary side of the main transformer or the outlet voltage transformer of the grid-connected point near to the grid side.
The internal terminal is also connected with a machine end frequency sampling point of the first control device, and the network internal terminal is also connected with a network measurement frequency sampling point of the first control device. The first control device is a PID controller of a primary frequency modulation control loop in a speed regulator cabinet of the water-turbine generator set.
The first switch 11 and the second switch 12 in the switch group 1 are both electrically controlled switches. The second control device is controlled by a PLC program and can control the opening and closing of the electric control switch.
The adjustable frequency generating device can simulate the power grid frequency, can provide accurate and continuously-variable frequency difference signals for tests, and meets the basic requirements of primary frequency modulation tests. The colors of the wires connecting the terminals in the switch group 1 are different, the different colors are used for distinguishing the positions of the wire distribution, and the diameters of the wires are also set according to the requirements of the secondary side loop.
In another aspect, based on the primary frequency modulation test frequency adding apparatus, the present application further includes a primary frequency modulation test frequency adding method, as shown in fig. 2, which is a flowchart of a method for adding a primary frequency modulation test frequency provided in an embodiment of the present application, and the method includes the following steps:
step S1: and a primary frequency modulation test frequency adding device is connected before the test.
And under the shutdown state of the generator, a screwdriver is used for cutting a connecting sheet in the middle of a terminal row of the frequency measurement loop, and a prepared primary frequency modulation test frequency adding switching device is accessed. The specific access mode is as follows:
a first terminal and a second terminal of the first switch 11 are respectively and correspondingly connected with a first machine outer terminal and a second machine outer terminal through conducting wires, and a third terminal and a fourth terminal of the first switch 11 are respectively and correspondingly connected with a first machine inner terminal and a second machine inner terminal through conducting wires; the fifth terminal and the sixth terminal of the second switch 12 are respectively connected with the adjustable frequency generating device through conducting wires, and the seventh terminal and the eighth terminal of the second switch 12 are respectively correspondingly connected with the third terminal and the fourth terminal through conducting wires.
The first external terminal and the second external terminal are also connected with the secondary side of the generator outlet voltage transformer, and the off-grid terminal is connected with the secondary side of the main transformer or the outlet voltage transformer of the grid-connected point near to the grid side.
The internal terminal is also connected with a machine end frequency sampling point of the first control device, and the network internal terminal is also connected with a network measurement frequency sampling point of the first control device.
The first switch 11 and the second switch 12 in the switch group 1 are both electric control switches, and the electric control switches are respectively in communication connection with the second control device.
Step S2: the speed regulator is debugged in a remote control and automatic mode, the second control device closes the first switch 11 and opens the second switch 12, and the generator is in a normal startup and grid-connected state.
The method specifically comprises the following steps: under the remote control mode of the speed regulator, the function of the speed regulator for controlling the opening degree of the guide vane is controlled by the monitoring system, and under the automatic mode of the speed regulator, the speed regulator is automatically controlled by a monitoring upper computer or a monitoring local PLC according to a program. When the scribing piece is cut to enable the primary frequency modulation test frequency adding device to be connected into the cut part in series, the first switch 11 is closed to enable the scribing piece to be connected in a closed mode, so that the frequency measurement loop is normal, and the generator can normally start and be connected to the grid.
Step S3: the speed regulator is debugged in a near control and electric manual mode, the second control device opens the first switch 11 and closes the second switch 12, and the adjustable frequency generating device generates a frequency signal. The method specifically comprises the following steps:
the speed regulator is debugged to be in a near control mode and an electric manual mode, the function of controlling the opening degree of the guide vane by the speed regulator in the near control mode can be operated on a local cabinet of the speed regulator, the function of controlling the opening degree of the guide vane by the speed regulator in the manual mode has no feedback, the speed regulator is adjusted in an open loop mode, and the opening degree of the guide vane can be adjusted on the local cabinet. The electric manual mode belongs to one of manual modes, a common medium-large unit has the selection of the electric manual mode and the mechanical manual mode, and the manual mode has the advantage that in the switching process of the first switch 11 and the second switch 12, the frequency measurement break point of a frequency measurement loop cannot cause guide vane change or fluctuation.
Step S4: and carrying out a primary frequency modulation test and a joint modulation test of the primary frequency modulation and AGC.
The first control device carries out primary frequency modulation by comparing the frequency difference between the terminal side frequency sampling point and the network side frequency sampling point, and the primary frequency modulation test and the joint modulation test of the primary frequency modulation and the AGC verify the self function of the primary frequency modulation and the matching condition of the primary frequency modulation and the AGC through artificially generated frequency signals. AGC is an automatic generation control system in a generator, and controls the opening of a guide vane by the cooperation of AGC and a speed regulator so that the absolute value of the frequency difference is maintained in a dead zone range.
Step S5: and after the primary frequency modulation test is finished, removing the primary frequency modulation test frequency adding device.
The primary frequency modulation frequency adding device is dismantled in two specific situations.
The first one is that the machine needs to be stopped after the test is finished, applies for stopping, and can safely remove the primary frequency modulation test frequency adding device and recover the connection line of the terminal row 2 of the speed regulator after the machine set is completely stopped.
The second situation is that the power generation grid-connected state is continuously maintained without stopping after the primary frequency modulation test is finished, and at the moment, the primary frequency modulation test frequency adding device can be dismounted without disturbance: firstly, the remote control and automatic modes of the speed regulator are switched into the near control and electric manual modes; then disconnecting the adjustable frequency generating device, disconnecting the second switch 12 by the second control device, and recovering the connecting line in the middle of the terminal block of the frequency measurement loop by using a screwdriver; and finally, the speed regulator is restored to a remote control and automatic mode.
The device and the method for adding the primary frequency modulation test frequency can efficiently, undisturbed and safely carry out the primary frequency modulation test. The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (5)
1. A primary frequency modulation test frequency adding device is characterized in that an inner terminal row of a speed regulator cabinet of a hydroelectric generating set comprises an inner terminal, an outer terminal and an outer terminal; the device is characterized by comprising a switch group and an adjustable frequency generation device;
the switch group comprises a first switch and a second switch, wherein a first end of the first switch is connected with the external terminal, and a second end of the first switch is connected with the internal terminal; the first end of the second switch is connected with an adjustable frequency generating device, and the second end of the second switch is connected with the second end of the first switch;
the internal terminal is also connected with a machine end frequency sampling point of the first control device, and the internal terminal is also connected with a network measurement frequency sampling point of the first control device.
2. The device for adding a primary frequency modulation test frequency according to claim 1, further comprising a second control device, wherein the first switch and the second switch in the switch group are both electrically controlled switches, the electrically controlled switches are respectively in communication connection with the second control device, and the second control device is used for controlling the opening and closing of the electrically controlled switches.
3. A primary frequency modulation test frequency adding device according to claim 1, wherein a first terminal and a second terminal of the first switch are respectively and correspondingly connected with a first external terminal and a second external terminal through conducting wires, and a third terminal and a fourth terminal of the first switch are respectively and correspondingly connected with a first internal terminal and a second internal terminal through conducting wires;
and a fifth terminal and a sixth terminal of the second switch are respectively connected with the adjustable frequency generating device through leads, and a seventh terminal and an eighth terminal of the second switch are respectively correspondingly connected with the third terminal and the fourth terminal through leads.
4. A primary frequency modulation test frequency adding apparatus according to claim 3, wherein said first off-board terminal and said second off-board terminal are further connected to a secondary side of a generator outlet voltage transformer, and said grid-outside terminal is connected to a secondary side of a main transformer or an outlet voltage transformer on a grid-connected side.
5. The primary frequency modulation test frequency adding device according to claim 2, wherein the first control device is a PID controller of a primary frequency modulation control loop in a speed regulator cabinet of a hydro-turbo generator set; and the second control device is controlled by a PLC program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122941870.7U CN216248192U (en) | 2021-11-26 | 2021-11-26 | Device is added to experimental frequency of primary control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122941870.7U CN216248192U (en) | 2021-11-26 | 2021-11-26 | Device is added to experimental frequency of primary control |
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| Publication Number | Publication Date |
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| CN216248192U true CN216248192U (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122941870.7U Active CN216248192U (en) | 2021-11-26 | 2021-11-26 | Device is added to experimental frequency of primary control |
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| CN (1) | CN216248192U (en) |
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2021
- 2021-11-26 CN CN202122941870.7U patent/CN216248192U/en active Active
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