CN113552482B - Method and device for testing power generation frequency of pump station synchronous motor - Google Patents
Method and device for testing power generation frequency of pump station synchronous motor Download PDFInfo
- Publication number
- CN113552482B CN113552482B CN202110813765.7A CN202110813765A CN113552482B CN 113552482 B CN113552482 B CN 113552482B CN 202110813765 A CN202110813765 A CN 202110813765A CN 113552482 B CN113552482 B CN 113552482B
- Authority
- CN
- China
- Prior art keywords
- power
- synchronous motor
- power generation
- load
- actual
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 200
- 238000010248 power generation Methods 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000012360 testing method Methods 0.000 title claims description 49
- 238000010998 test method Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000005611 electricity Effects 0.000 claims description 25
- 238000012545 processing Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 15
- 230000002441 reversible effect Effects 0.000 description 8
- 230000005284 excitation Effects 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000001363 water suppression through gradient tailored excitation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The application provides a power generation frequency test method and device of a pump station synchronous motor, and relates to the technical field of operation management and electromechanical frequency conversion of a station. The method comprises the following steps: accessing a synchronous motor to be tested into a power grid and controlling the synchronous motor to operate in a power generation mode, wherein the synchronous motor is a synchronous motor in a pump station; measuring the actual power generated by the synchronous motor; according to the actual generated power, an electric load matched with the actual generated power is connected to the low-voltage side of the station transformer; and adjusting the load value of the power utilization load to obtain an adjusted load value, and determining the target power generation frequency of the synchronous motor according to the adjusted load value and the actual power generation power. In the method, the problem that the optimal power generation frequency is difficult to accurately determine after the synchronous motor in the prior art reversely rotates to generate power is effectively solved by executing the steps on the synchronous motor in the actual pump station.
Description
Technical Field
The application relates to the technical field of pump station operation management and electromechanical frequency conversion, in particular to a method and a device for testing the power generation frequency of a pump station synchronous motor.
Background
The large pump station is generally provided with a vertical synchronous motor for driving the water pump to operate, and the synchronous motor can be used as a generator to reversely operate. Research shows that by reducing the rotating speed of the motor in the reverse direction, higher power generation efficiency can be obtained, and the frequency conversion operation mode can adjust the operation rotating speed of the motor unit at any time according to different operation conditions, so that the unit always keeps operating under the optimal working condition, the power generation operation efficiency is greatly improved, and the water energy resource is fully utilized, so that the frequency conversion operation becomes the optimal mode of the power generation operation of the water pump. However, although the operation speed of the motor unit can be adjusted at any time according to different operation conditions in the variable frequency operation mode, the determination of the optimal power generation frequency of the unit, namely the unit speed, is difficult.
In the prior art, the optimal power generation frequency of the unit is usually determined by adopting theoretical derivation, model conversion and other modes.
However, these two methods have drawbacks due to the different pump station unit types, water inlet channels, water outlet channels and flow stopping modes, and as a result, there may be a large deviation and uncertainty from reality.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, after the synchronous motor reversely rotates to generate power, the optimal power generation frequency is difficult to accurately determine.
In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:
in a first aspect, an embodiment of the present application provides a method for testing a power generation frequency of a pump station synchronous motor, where the method includes:
accessing a synchronous motor to be tested into a power grid and controlling the synchronous motor to operate in a power generation mode, wherein the synchronous motor is a synchronous motor in a pump station;
measuring the actual power generated by the synchronous motor;
according to the actual generated power, an electric load matched with the actual generated power is connected to the low-voltage side of the station transformer;
and adjusting the load value of the power utilization load to obtain an adjusted load value, and determining the target power generation frequency of the synchronous motor according to the adjusted load value and the actual power generation power.
As one possible implementation manner, the changing the load value of the electric load, and determining the target power generation frequency of the synchronous motor according to the changed load value of each electric load and the actual power generation power includes:
gradually increasing the load value of the electricity load according to a preset increment value;
establishing a generating power curve of the actual generating power of the synchronous motor along with the change of the load value of the power load;
and determining the target power generation frequency of the synchronous motor according to the power generation power curve.
As a possible implementation manner, the determining, according to the generated power curve, a target generated frequency of the synchronous motor includes:
and taking the power generation frequency corresponding to the maximum power generation power on the power generation power curve as the target power generation frequency of the synchronous motor, wherein the power generation frequency corresponding to the maximum power generation power is the actual power generation frequency when the synchronous motor outputs the maximum power generation power.
As a possible implementation manner, the controlling the synchronous motor to operate in a power generation mode includes:
exchanging two of the three-phase cables of the synchronous motor to be tested;
controlling a water outlet gate of a pump station to be opened so as to trigger the synchronous motor to rotate reversely;
and when the variation of the rotating speed of the synchronous motor is smaller than a first preset threshold value, the high-voltage circuit breaker connected with the main transformer and the power grid is controlled to be disconnected.
As a possible implementation manner, before the synchronous motor to be tested is connected to the power grid and the synchronous motor is controlled to operate in the power generation mode, the method further includes:
closing a protection working mode of the synchronous motor under low frequency and low voltage;
and closing a protection working mode of the synchronous motor under the condition of over-frequency and over-voltage.
As a possible implementation manner, the step of accessing an electric load matched with the actual generated power at the low-voltage side of the station transformer according to the actual generated power includes:
acquiring the actual power generation power;
and accessing a target electricity utilization load matched with the actual generated power to a low-voltage side of the station transformer, wherein the load value of the target electricity utilization load is larger than the actual generated power, and the difference value between the load value of the target electricity utilization load and the actual generated power is larger than a second preset threshold value.
As a possible implementation manner, the establishing a generated power curve of the actual generated power of the synchronous motor according to the load value of the electric load includes:
acquiring actual index parameters of the synchronous motor to be tested under each load value of the electricity load, wherein the actual index parameters comprise: water head, power generation frequency, rotation speed and power generation power;
and establishing a power generation power curve of the actual power generation power of the synchronous motor along with the load value change of the power utilization load according to the load values of the power utilization load and the actual index parameters under the load values.
In a second aspect, embodiments of the present application further provide a power generation frequency testing device of a pump station synchronous motor, the device includes:
the control module is used for connecting the synchronous motor to be tested into a power grid and controlling the synchronous motor to operate in a power generation mode;
the measuring module is used for measuring the actual power generated by the synchronous motor;
the access module is used for accessing an electric load matched with the actual power generation power to the low-voltage side of the station transformer according to the actual power generation power;
and the processing module is used for changing the load value of the electric load and determining the target power generation frequency of the synchronous motor according to the changed load value of each electric load and the actual power generation power.
In a third aspect, an embodiment of the present application further provides an electronic device, including: the system comprises a processor, a storage medium and a bus, wherein the storage medium stores program instructions executable by the processor, the processor and the storage medium are communicated through the bus when the electronic device runs, and the processor executes the program instructions to execute the steps of the power generation frequency testing method according to the first aspect.
In a fourth aspect, embodiments of the present application further provide a computer readable storage medium, on which a computer program is stored, which when executed by a processor performs the steps of the power generation frequency test method according to the first aspect described above.
The beneficial effects of this application are:
according to the method, the device, the electronic equipment and the computer readable storage medium for testing the power generation frequency of the synchronous motor of the pump station, firstly, the synchronous motor to be tested in an actual pump station is connected to a power grid, the synchronous motor is controlled to operate in a power generation mode, then, the actual power generation power generated by the synchronous motor is measured, according to the actual power generation power, a power utilization load matched with the actual power generation power is connected to the low-voltage side of a station transformer, the load value of the power utilization load is adjusted, the adjusted load value is obtained, and the target power generation frequency of the synchronous motor is determined according to the adjusted load value and the actual power generation power. In the method, the target power generation frequency of the synchronous motor can be determined by continuously increasing the load value of the power load by executing the steps on the synchronous motor in the actual pump station, so that the error caused by traditional theoretical calculation and model conversion is effectively solved, the problem that the optimal power generation frequency is difficult to accurately determine after the synchronous motor reversely rotates to generate power in the prior art is solved, and the testing method is safe, low in cost, safe and controllable, meets the actual requirement, and provides an effective method for technical improvement of power generation of similar pump stations.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a working principle of a variable frequency generator set according to a method for testing a power generation frequency of a pump station synchronous motor according to an embodiment of the present application;
fig. 3a is a schematic diagram of an electrical primary main wiring system of a method for testing a power generation frequency of a pump station synchronous motor according to an embodiment of the present application;
FIG. 3b is a schematic diagram of an electrical primary main wiring system of another method for testing the power generation frequency of a pump station synchronous motor according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a method for testing the power generation frequency of a pump station synchronous motor according to an embodiment of the present application;
FIG. 5 is a flow chart of a method for testing the frequency of power generation of a pump station synchronous motor according to an embodiment of the present disclosure;
FIG. 6 is a flow chart of a method for testing the frequency of power generation of a pump station synchronous motor according to an embodiment of the present disclosure;
FIG. 7 is a flow chart of a method for testing the frequency of power generation of a pump station synchronous motor according to an embodiment of the present disclosure;
FIG. 8 is a graph of generated power of a method for testing generated frequency of a pump station synchronous motor according to an embodiment of the present disclosure;
FIG. 9 is a flow chart of a method for testing the frequency of power generation of a pump station synchronous motor according to an embodiment of the present disclosure;
fig. 10 is a block diagram of a power generation frequency testing device of a pump station synchronous motor according to an embodiment of the present application;
fig. 11 is a block diagram of a power generation frequency testing device of a pump station synchronous motor according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of 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 should be understood that the drawings in the present application are only for the purpose of illustration and description, and are not intended to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this application, illustrates operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to the flow diagrams and one or more operations may be removed from the flow diagrams as directed by those skilled in the art.
In addition, the described embodiments are only some, but not all, of the embodiments of the present application. The components of the embodiments of the present application, which are 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 application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
In order to enable a person skilled in the art to use the present application, in connection with a specific application scenario "test of the power generation frequency of a pump station synchronous motor", the following embodiments are given. It will be apparent to those having ordinary skill in the art that the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present application. While the present application is primarily described in the context of testing the frequency of power generation of a pump station synchronous motor, it should be understood that this is but one exemplary embodiment.
It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the presence of the features stated hereinafter, but not to exclude the addition of other features.
An electronic device 10 is provided in an embodiment of the present application, as shown in fig. 1, which is a schematic structural diagram of the electronic device 10 provided in the embodiment of the present application, including: a processor 101, a memory 102, and a bus 103. The memory 102 stores machine readable instructions executable by the processor 101 that when executed by the processor 101 perform the steps of the pump station synchronous motor power generation frequency test method of the embodiments of the present application when the electronic device 10 is in operation, the processor 101 and the memory 102 are in communication via the bus 103.
Fig. 2 is a schematic diagram of a working principle of a variable frequency generator set of a power generation frequency testing method of a pump station synchronous motor according to an embodiment of the present application. As shown in fig. 2, the variable frequency generator BG and the variable frequency motor BM in the figure work coaxially, but work on a large power frequency power grid and a small low frequency power grid respectively, and the variable frequency motor BM and the synchronous motor M work on a small self-built low frequency power grid.
Fig. 3a is a schematic diagram of an electrical primary main wiring system of a method for testing a power generation frequency of a pump station synchronous motor according to an embodiment of the present application, and fig. 3b is an electrical load R with an adjustable load value added on the basis of fig. 3a for testing.
The system shown in fig. 3b is described in detail below.
As shown in fig. 3b, the system comprises: the large power grid refers to a national power grid and supplies power for the synchronous motor so as to drive the water pump to convey a water source. The small power grid is a power grid formed for testing, and mainly comprises a synchronous motor M to be tested, a station transformer and an electricity load R, wherein electric energy generated by the synchronous motor M is transmitted to a station transformer, namely a station transformer position through a 6KV bus, and after the station transformer steps down the electric energy, the electricity load R connected to a station low-voltage side is supplied with electricity. It should be noted that, in fig. 3b, the 1# host, the 2# host, the 3# host, the 4# host, and the 5# host may be all the motors to be tested, and the 1# host is taken as an example for the present embodiment. The transformer for the station is a step-down transformer for the power of a transformer substation and a hydropower station, and is called station transformer or station transformer for short.
On the basis of introducing the system shown in fig. 3b, a method for testing the power generation frequency of the pump station synchronous motor according to the embodiment of the present application will be described in detail below.
Fig. 4 is a flow chart of a method for testing power generation frequency of a pump station synchronous motor according to an embodiment of the present application, and an execution subject of the method is the electronic device shown in fig. 1. The electronic device may be connected to the control device in the system shown in fig. 3b described above and by means of which the following embodiments of the present application are performed. As shown in fig. 4, the method includes:
step S401: and connecting the synchronous motor to be tested to a power grid and controlling the synchronous motor to operate in a power generation mode.
The large pump station is generally provided with a vertical synchronous motor and a water pump, and the synchronous motor is used for providing power for the water pump. However, if the synchronous motor is rotated in the reverse direction, the motor can be used as a generator. Therefore, the river channel waste water is utilized to drain down through the motor unit flow channel, and the synchronous motor unit can be reversed to realize the power generation function as long as the runaway rotation speed of the unit exceeds the rated rotation speed.
Optionally, the synchronous motor to be tested may be physically connected with other devices in the power grid in advance according to the connection mode shown in fig. 3a or 3b, and when the synchronous motor needs to be tested, the synchronous motor may be connected with other devices in the power grid in a communication manner through a switch control mode or the like, so that the synchronous motor is connected to the power grid.
From the above, the synchronous motor of the pump station can be used as a motor to provide power for the water pump to pump water, and can also be used as a generator by controlling the synchronous motor to reversely rotate. In the following, it will be explained how the synchronous motor is connected to the power grid in two states of normal operation for powering the water pump and reverse rotation power generation, respectively.
The operation flow of the synchronous motor unit of the pump station for providing power for the water pump during normal operation is as follows, referring to fig. 3a:
(1) The 3065, 3013, 3003, 3005 high voltage isolation switches are closed.
(2) The high voltage circuit breaker is closed 301.
(3) The high voltage circuit breaker is closed 601.
(4) And pushing the capacitor lightning arrester and the voltage transformer handcart to a working position.
(5) And closing the high-voltage circuit breaker of the host, so that the pumping operation of the unit can be realized.
The operation flow of the synchronous motor of the pump station for reverse rotation power generation and power access to the power grid is shown as follows, and specific reference is made to fig. 3b:
(1) The 3065, 3013, 3003, 3005 high voltage isolation switches are closed.
(2) The high voltage circuit breaker is closed 301.
(3) The high voltage circuit breaker is closed 601.
(4) And pushing the capacitor lightning arrester and the voltage transformer handcart to a working position.
(5) And the quick gate at the outlet of the unit is lifted, so that the unit is reversed, and the main machine high-voltage circuit breaker is closed when the rotating speed is close to the subsynchronous speed, so that the generating operation of the unit can be realized.
(6) And putting an electric load with similar power on the low-voltage side of the station transformer according to the actually measured power of the generator. (the load power should be slightly greater than 10% of the generator output).
(7) And separating 601 the high-voltage circuit breakers to form a small power grid for generating power by the unit and changing the station into electricity.
It is understood that although the design working conditions of each pump station are different, the number of installed units is different, the principle of the main wiring diagram is basically similar, and the operation modes of starting and stopping are basically the same.
Step S402: the actual generated power of the synchronous motor is measured.
When the synchronous motor is operated in the power generation mode, its actual generated power is measured.
Step S403: and according to the measured actual generated power, connecting an electric load matched with the measured actual generated power to the low-voltage side of the station transformer.
The station transformer can be a step-down transformer for a transformer substation and a hydropower station to use electricity, one side of the station transformer is connected with a high-voltage power grid, and the other side of the station transformer is connected with an electricity load, namely a low-voltage side. The transformer is used, the voltage of the high-voltage power grid can be reduced and then supplied to the power utilization load for use, and the phenomenon that the power utilization load is burnt out due to the fact that the power utilization load is directly connected with the high-voltage power grid with too large voltage is avoided.
As shown in fig. 3b, an electrical load R is connected to the low-voltage side of the station transformer in the small power network, wherein the load value of the electrical load R and the measured actual generated power of the synchronous motor M are matched to ensure a relative balance of the small power network.
Step S404: and adjusting the load value of the power utilization load to obtain an adjusted load value, and determining the target power generation frequency of the synchronous motor to be tested according to the adjusted load value and the actual power generation power.
For example, the load value of the electric load may be adjusted to be periodically or in a specific increment value, and when the load value of the electric load increases, the rotation speed of the synchronous motor decreases, and thus the frequency decreases, the actual power generation power of the motor is measured, and the target power generation frequency of the synchronous motor to be tested may be determined according to the continuously adjusted load value and the corresponding actual power generation power.
In summary, the embodiment of the application provides a method for testing the power generation frequency of a pump station synchronous motor. Firstly, connecting a synchronous motor to be tested in an actual pump station to a power grid, controlling the synchronous motor to operate in a power generation mode, measuring the actual power generated by the synchronous motor, connecting an electricity utilization load matched with the actual power generation power to the low-voltage side of a station transformer according to the actual power generation power, adjusting the load value of the electricity utilization load to obtain an adjusted load value, and determining the target power generation frequency of the synchronous motor according to the adjusted load value and the actual power generation power. In the embodiment of the application, the above steps are executed on the synchronous motor in the actual pump station, so that the target power generation frequency of the synchronous motor can be determined by continuously increasing the load value of the power load, and therefore, the error caused by traditional theoretical calculation and model conversion is effectively solved, the problem that the optimal power generation frequency is difficult to accurately determine after the synchronous motor reversely rotates to generate power in the prior art is solved, and the testing method is safe, low in cost, safe and controllable and meets the reality.
The power generation frequency testing method based on the actual pump station synchronous motor can solve the error problem caused by traditional theoretical calculation, relatively accurately find the optimal power generation variable frequency, provide scientific basis for pump station technical improvement equipment model selection, avoid decision making errors and investment economic loss, and provide a good technical solution for similar business in the same industry. Compared with the method for directly reversing the motor to generate power, the method for testing the power generation frequency of the pump station synchronous motor provided by the embodiment of the application has the advantages that the power generation power and the power generation efficiency are increased by nearly 50%.
Optionally, because the synchronous motor of the large pump station is generally configured with a low-frequency load shedding (48.5 Hz) and over-frequency protection (52 Hz) function, the setting is needed when the power frequency power grid is used, but in the application, in view of the instability of the small power grid and the requirement of actual testing, before the synchronous motor to be tested is connected to the power grid and the synchronous motor is controlled to operate in a power generation mode, the two protection modes can be closed, namely: and closing the protection working mode of the synchronous motor under the low-frequency and low-voltage conditions, and closing the protection working mode of the synchronous motor under the over-frequency and over-voltage conditions.
After the low-frequency low-voltage and over-frequency overvoltage protection working modes of the synchronous motor are closed, the motor can be protected in a manual control mode, potential safety hazards are avoided, and the motor can be recovered in time after the test is finished.
Next, an embodiment will be specifically described how to control the synchronous motor to operate in the power generation mode, please refer to fig. 5, which is a flowchart of another power generation frequency testing method of the pump station synchronous motor according to an embodiment of the present application, as shown in fig. 5, where step S401 includes:
step S501: two of the three-phase cables of the synchronous motor to be tested are exchanged.
Alternatively, the exchange of two of the three-phase cables of the synchronous motor may refer to the exchange of any two of the three-phase cables.
Step S502: and controlling the water outlet gate of the pump station to be opened so as to trigger the synchronous motor to rotate reversely.
It will be appreciated that in a pump station, the synchronous motor is typically located below the outlet gate to power the water pump to deliver the water source. If the synchronous motor is expected to rotate reversely, the water outlet gate of the pump station can be controlled to be opened, and after the water outlet gate is opened, the water flow is discharged downwards to enable the synchronous motor to rotate reversely, namely the synchronous motor is triggered to rotate reversely.
Step S503: and when the variation of the rotating speed of the synchronous motor is smaller than a first preset threshold value, the high-voltage circuit breaker connected with the main transformer and the power grid is controlled to be disconnected.
Continuing the above example, when the water gate is opened, the water flow is released to trigger the synchronous motor to reverse, and at the same time, under the continuous flushing of the water flow, the synchronous motor rotates reversely faster and faster, that is, the variation of the rotation speed of the synchronous motor is smaller and smaller, and when the variation of the rotation speed of the synchronous motor is smaller than the first preset threshold, that is, the rotation speed of the synchronous motor tends to be stable, that is, when the flying rotation speed of the synchronous motor reaches or exceeds the rated rotation speed of the synchronous motor, the synchronous motor can realize reverse power generation, at the moment, the high-voltage circuit breaker connected with the main transformer and the large power grid is controlled to be disconnected, so as to form a small power grid for power utilization of the station transformer, and the small power grid can be a small power grid as illustrated in fig. 3 b.
Optionally, after the synchronous motor to be tested is operated in the power generation mode, the motor starts to generate power, at this time, the actual power generated by the motor needs to be measured, so that an appropriate power load can be connected to the motor according to the actual power generated by the motor, please refer to fig. 6, which is a schematic flow chart of a power generation frequency testing method of another pump station synchronous motor provided in the embodiment of the present application, as shown in fig. 6, the step S403 includes:
step S601: and obtaining the actual power.
Step S602: a target electric load matched with the actual generated power is connected to the low-voltage side of the station transformer.
The load value of the target electricity load is greater than the actual power, and the difference between the load value of the target electricity load and the actual power is greater than a second preset threshold, which may be 10% of the actual power.
Optionally, the following embodiment will describe in detail a specific process of determining the target power generation frequency based on the change of the load value of the electric load, please refer to fig. 7, which is a schematic flow chart of a power generation frequency testing method of another pump station synchronous motor according to the embodiment of the present application, as shown in fig. 7, wherein step S404 includes:
step S701: gradually increasing the load value of the power load according to a preset increment value;
alternatively, the preset increment value can be input with a size of 5-10kW, when the load value of the electric load is gradually increased, the rotation speed and the frequency of the generator are synchronously reduced, the reduction of the frequency is controlled not to be too fast, and the preset increment value can be reduced according to the amplitude of 1-2Hz so as to facilitate the subsequent drawing of a continuous curve.
Step S702: a generated power curve is established in which the actual generated power of the synchronous motor varies with the load value of the consumer load.
Step S703: and determining the target power generation frequency of the synchronous motor according to the power generation power curve.
Alternatively, determining the target generated power of the synchronous motor according to the generated power curve may be to use a generated frequency corresponding to the maximum generated power on the generated power curve as the target generated frequency of the synchronous motor, where the generated frequency corresponding to the maximum generated power is an actual generated frequency when the synchronous motor outputs the maximum generated power.
Referring to fig. 8, a graph of generating power of the method for testing generating frequency of the pump station synchronous motor according to the embodiment of the present application includes: as shown in fig. 8, the maximum value of the generated power in the graph is 347kW, and the position of the power value is the inflection point of the generated power, from which the generated power of the synchronous motor changes from the previous increasing trend to the decreasing trend, so that 347kW is the maximum generated power. Referring to fig. 8, the corresponding power generation frequency is 39.01Hz, and 39.01Hz is the target power generation frequency obtained by the test. The negative sign at the front of the generated power value in fig. 8 indicates that the power is the output power of the synchronous motor.
The method for determining the target power generation frequency based on the load value of the electric load changes, which is used in the embodiment of the application, effectively solves the errors caused by traditional theoretical calculation and model conversion, and has the advantages of safety, low cost, safety, controllability and practical applicability. An effective method is provided for the power generation technical improvement of similar pump stations.
Optionally, a generating power curve of the actual generating power of the synchronous motor according to the load value of the electric load may be established as follows, please refer to fig. 9, which is a schematic flow chart of a generating frequency testing method of a pump station synchronous motor according to an embodiment of the present application, as shown in fig. 9, and step S702 includes:
step S901: acquiring actual index parameters of the synchronous motor to be tested under the condition that the power consumption load is at each load value;
the actual index parameters include: the water level difference, the power generation frequency, the rotating speed and the power generation power are continuously recorded according to the input condition of the load, the operation can be stopped until an inflection point appears and the working condition is stable, and the operation stability of the synchronous motor and the heating condition of the load need to be observed in the process.
Step S902: and according to each load value of the electric load and the actual index parameter under each load value, establishing a power generation power curve of the actual power generation power of the synchronous motor along with the change of the load value of the electric load.
Optionally, the embodiment of the application further provides a method for setting an excitation device when the pump station is switched from forward pumping to reverse power generation, and the method for testing the power generation frequency of the pump station synchronous motor in the foregoing embodiment adopts the method for setting the pump station excitation device provided in the embodiment, and the method includes:
(1) Exciting basic parameters are adjusted, and a power-on default control mode is adjusted to be manual;
(2) Protection and limiter parameter adjustment, low voltage forced excitation activation is adjusted to be 'no', and minimum excitation limiting activation is adjusted to be 'no';
(3) The low-voltage excitation of the excitation device needs to be exited;
(4) Before the generator is disconnected from the grid breaker, the exciting current should be adjusted until the output reactive power of the generator is close to zero.
By applying the power generation frequency testing method of the pump station synchronous motor, the power generation power and the power generation efficiency of the pump station synchronous motor are increased by approximately 50% compared with the method of directly reversely rotating the synchronous motor to generate power, and specific data are shown in the following table:
generating efficiency before transformation:
after transformation, the power generation efficiency is as follows:
where f is the power generation frequency of the synchronous motor, N is the rotation speed of the synchronous motor, P is the power generation power of the synchronous motor, Q is the water flow in unit time, H is the water head difference, and η is the power generation efficiency.
Based on the same inventive concept, the embodiment of the application also provides a power generation frequency testing device of the pump station synchronous motor, which corresponds to the power generation frequency testing method of the pump station synchronous motor.
Fig. 10 is a block diagram of a power generation frequency testing device of a pump station synchronous motor according to an embodiment of the present application, as shown in fig. 10, the device includes:
the control module 1001 is used for connecting the synchronous motor to be tested to the power grid and controlling the synchronous motor to operate in a power generation mode.
And a measurement module 1002, configured to measure an actual generated power generated by the synchronous motor.
And the access module 1003 is used for accessing an electric load matched with the actual generated power to the low-voltage side of the station transformer according to the actual generated power.
And the processing module 1004 is configured to change a load value of the electric loads, and determine a target power generation frequency of the synchronous motor according to the changed load value of each electric load and the actual power generation power.
In some possible implementations, the control module 1001 is specifically configured to:
exchanging two of the three-phase cables of the synchronous motor to be tested;
controlling a water outlet gate of a pump station to be opened so as to trigger the synchronous motor to rotate reversely;
and when the variation of the rotating speed of the synchronous motor is smaller than a first preset threshold value, the high-voltage circuit breaker connected with the main transformer and the power grid is controlled to be disconnected.
In some possible implementations, the access module 1003 is specifically configured to:
acquiring the actual power generation power;
and accessing a target electricity utilization load matched with the actual generated power to a low-voltage side of the station transformer, wherein the load value of the target electricity utilization load is larger than the actual generated power, and the difference value between the load value of the target electricity utilization load and the actual generated power is larger than a second preset threshold value.
In some possible implementations, the processing module 1004 is specifically configured to:
gradually increasing the load value of the power load according to a preset increment value;
establishing a generating power curve of the actual generating power of the synchronous motor along with the change of the load value of the power load;
and determining the target power generation frequency of the synchronous motor according to the power generation power curve.
FIG. 11 is a block diagram of a device for testing the frequency of power generation of a pump station synchronous motor according to an embodiment of the present application, and in some possible implementations, as shown in FIG. 11, the device further includes:
the first shut-down module 1101 is configured to shut down a protective operation mode of the synchronous motor at low frequency and low voltage.
The second shutdown module 1102 is configured to shutdown a protection operation mode of the synchronous motor under an over-frequency condition.
The foregoing apparatus is configured to execute the method provided in the foregoing embodiment, and description of the processing flow of each module in the apparatus and the interaction flow between each module may refer to the relevant description in the foregoing method embodiment, which is not repeated herein.
The above modules may be one or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), or one or more microprocessors (digital singnal processor, abbreviated as DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, abbreviated as FPGA), or the like. For another example, when a module above is implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processor that may invoke the program code. For another example, the modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
The power frequency, frequency conversion, rotation speed, excitation, relay protection and the like mentioned in the embodiment of the application belong to professional electrician terms, and specific meanings can refer to related professional books and specifications, and are not repeated here.
The specific operation method in the embodiment of the present application may be appropriately adjusted according to different design manners of the main connection of each pump station, and the operation flow refers to the corresponding start-stop operation ticket, so those skilled in the art can clearly understand that the specific reference may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
The embodiment of the application also provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to execute the steps in the embodiment of the power generation frequency testing method of the pump station synchronous motor.
In particular, the storage medium can be a general-purpose storage medium, such as a mobile magnetic disk, a hard disk, and the like, and when the computer program on the storage medium is executed, the embodiment of the power generation frequency testing method of the pump station synchronous motor can be executed.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform some of the steps of the methods according to the embodiments of the invention. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.
Claims (9)
1. A method for testing the power generation frequency of a synchronous motor of a pump station, comprising:
accessing a synchronous motor to be tested into a power grid and controlling the synchronous motor to operate in a power generation mode, wherein the synchronous motor is a synchronous motor in a pump station;
measuring the actual power generated by the synchronous motor;
according to the actual generated power, an electric load matched with the actual generated power is connected to the low-voltage side of the station transformer;
adjusting the load value of the power utilization load to obtain an adjusted load value, and determining the target power generation frequency of the synchronous motor according to the adjusted load value and the actual power generation power;
the adjusting the load value of the electricity load to obtain an adjusted load value, and determining the target power generation frequency of the synchronous motor according to the adjusted load value and the actual power generation power, including:
gradually increasing the load value of the electricity load according to a preset increment value;
establishing a generating power curve of the actual generating power of the synchronous motor along with the change of the load value of the power load;
and determining the target power generation frequency of the synchronous motor according to the power generation power curve.
2. The method of claim 1, wherein said determining a target generation frequency of the synchronous motor from the generation power curve comprises:
and taking the power generation frequency corresponding to the maximum power generation power on the power generation power curve as the target power generation frequency of the synchronous motor, wherein the power generation frequency corresponding to the maximum power generation power is the actual power generation frequency when the synchronous motor outputs the maximum power generation power.
3. The method of any of claims 1-2, wherein said controlling the synchronous motor to operate in a generating mode comprises:
exchanging two of the three-phase cables of the synchronous motor to be tested;
controlling a water outlet gate of a pump station to be opened so as to trigger the synchronous motor to rotate reversely;
and when the variation of the rotating speed of the synchronous motor is smaller than a first preset threshold value, the high-voltage circuit breaker connected with the main transformer and the power grid is controlled to be disconnected.
4. The method according to any one of claims 1-2, wherein before said connecting the synchronous motor to be tested to the power grid and controlling said synchronous motor to operate in the generating mode, further comprises:
closing a protection working mode of the synchronous motor under low frequency and low voltage;
and closing a protection working mode of the synchronous motor under the condition of over-frequency and over-voltage.
5. The method according to any one of claims 1-2, wherein said accessing an electrical load matching said actual generated power at a low voltage side of a station transformer based on said actual generated power comprises:
acquiring the actual power generation power;
and accessing a target electricity utilization load matched with the actual generated power to a low-voltage side of the station transformer, wherein the load value of the target electricity utilization load is larger than the actual generated power, and the difference value between the load value of the target electricity utilization load and the actual generated power is larger than a second preset threshold value.
6. The method according to claim 1, wherein said establishing a generated power curve of an actual generated power of the synchronous motor as a function of a load value of the electric load includes:
acquiring actual index parameters of the synchronous motor to be tested under each load value of the electricity load, wherein the actual index parameters comprise: water head, power generation frequency, rotation speed and power generation power;
and establishing a power generation power curve of the actual power generation power of the synchronous motor along with the load value change of the power utilization load according to the load values of the power utilization load and the actual index parameters under the load values.
7. A power generation frequency testing device for a pump station synchronous motor, the device comprising:
the control module is used for connecting the synchronous motor to be tested into a power grid and controlling the synchronous motor to operate in a power generation mode;
the measuring module is used for measuring the actual power generated by the synchronous motor;
the access module is used for accessing an electric load matched with the actual power generation power to the low-voltage side of the station transformer according to the actual power generation power;
the processing module is used for enabling the load value of the power utilization load to change and determining the target power generation frequency of the synchronous motor according to the changed load value of each power utilization load and the actual power generation power;
the processing module is specifically configured to: gradually increasing the load value of the electricity load according to a preset increment value; establishing a generating power curve of the actual generating power of the synchronous motor along with the change of the load value of the power load; and determining the target power generation frequency of the synchronous motor according to the power generation power curve.
8. An electronic device, comprising: a processor, a storage medium and a bus, the storage medium storing program instructions executable by the processor, the processor and the storage medium communicating via the bus when the electronic device is running, the processor executing the program instructions to perform the steps of the power generation frequency test method according to any one of claims 1 to 6 when executed.
9. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the power generation frequency test method according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110813765.7A CN113552482B (en) | 2021-07-19 | 2021-07-19 | Method and device for testing power generation frequency of pump station synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110813765.7A CN113552482B (en) | 2021-07-19 | 2021-07-19 | Method and device for testing power generation frequency of pump station synchronous motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113552482A CN113552482A (en) | 2021-10-26 |
| CN113552482B true CN113552482B (en) | 2024-01-19 |
Family
ID=78132047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110813765.7A Active CN113552482B (en) | 2021-07-19 | 2021-07-19 | Method and device for testing power generation frequency of pump station synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113552482B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107265A (en) * | 1993-02-22 | 1995-08-23 | 杨泰和 | Differential distribution type electric energy storage system |
| JP2004320874A (en) * | 2003-04-15 | 2004-11-11 | Toshiba Plant Systems & Services Corp | Power generation system |
| CN108988359A (en) * | 2018-08-01 | 2018-12-11 | 深圳供电局有限公司 | Nonlinear automatic power generation control method, device, equipment and medium |
| CN110896222A (en) * | 2018-09-13 | 2020-03-20 | 中国石化工程建设有限公司 | Reactive compensation method of asynchronous generator |
-
2021
- 2021-07-19 CN CN202110813765.7A patent/CN113552482B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107265A (en) * | 1993-02-22 | 1995-08-23 | 杨泰和 | Differential distribution type electric energy storage system |
| JP2004320874A (en) * | 2003-04-15 | 2004-11-11 | Toshiba Plant Systems & Services Corp | Power generation system |
| CN108988359A (en) * | 2018-08-01 | 2018-12-11 | 深圳供电局有限公司 | Nonlinear automatic power generation control method, device, equipment and medium |
| CN110896222A (en) * | 2018-09-13 | 2020-03-20 | 中国石化工程建设有限公司 | Reactive compensation method of asynchronous generator |
Non-Patent Citations (2)
| Title |
|---|
| 军用电力系统频率测试研究;刘洪文;火力与指挥控制;88-91 * |
| 同步发电机型式试验自动测试系统及其可靠性设计;郭立炜等;电机与控制学报(第3期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113552482A (en) | 2021-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Merabet et al. | Energy management and control system for laboratory scale microgrid based wind-PV-battery | |
| CN104699996B (en) | Based on the equivalent power system Nonsymmetric Short Circuit power frequency quality computational methods of double-fed fan motor unit | |
| CN110661274B (en) | Composite dynamic power support system and coordination control method thereof | |
| CN205080211U (en) | High -voltage inverter simulation motor load platform topological structure | |
| CN105549420A (en) | Real-time simulation test method of direct-driving draught-fan variable flow control system | |
| CN103199526A (en) | Short circuit power frequency electrical quantity calculating method for power system comprising doubly-fed induction generator | |
| Varshney et al. | Performance characteristics and reliability assessment of self‐excited induction generator for wind power generation | |
| CN103630838A (en) | Twin-towing temperature rise method and device for doubly-fed generators | |
| Fengli et al. | Power flow calculation for radial distribution systems with distributed generation | |
| Faiz et al. | Precise derating of three phase induction motors with unbalanced voltages | |
| CN102570470B (en) | Transient stability-based generator phase advancing depth determination method | |
| CN109088441B (en) | Power electronic transformer parallel operation optimal load power distribution calculation method and device | |
| CN113552482B (en) | Method and device for testing power generation frequency of pump station synchronous motor | |
| CN110048410A (en) | Realize the frequency conversion load control method of network of ship stable operation | |
| AU2021271529A1 (en) | Methods and systems for off-grid load stabilization of energy distribution systems | |
| CN115333246B (en) | Chained energy Internet of things, chained energy coupling method, device and medium | |
| Ducar et al. | Efficiency analysis of a hydro-pump storage system for frequency support in microgrids | |
| Gandhar et al. | Application of SSSC for compensation assessment of interconnected power system | |
| CN115980566A (en) | Method and device for testing shutdown mode of electromechanical brake switch of pumped storage engine | |
| Liu et al. | Selection and simulation of black-start diesel generating set in regional power grid | |
| CN204118758U (en) | A kind of distributed solar energy cutting-in control case | |
| Haque | Maximum power delivery capability of a three-phase self-excited induction generator | |
| Zhao et al. | Modeling and simulation of micro-grid based on small-hydro | |
| Mitra et al. | Stability enhancement of wind farm connected power system using superconducting magnetic energy storage unit | |
| CN110362864A (en) | A kind of simplification method of limitation setting I-V curve greatest gradient |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |