CN115425675A - Automatic grid connection method and system for steam turbine generator - Google Patents
Automatic grid connection method and system for steam turbine generator Download PDFInfo
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- CN115425675A CN115425675A CN202210708196.4A CN202210708196A CN115425675A CN 115425675 A CN115425675 A CN 115425675A CN 202210708196 A CN202210708196 A CN 202210708196A CN 115425675 A CN115425675 A CN 115425675A
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- 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
- H02J3/381—Dispersed generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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Abstract
The invention discloses an automatic grid-connection method for a turbonator, which comprises the following steps: judging a starting condition, and if the starting condition is met, starting grid connection; starting the excitation device, the de-excitation device and the synchronization device in sequence to enter a working state; if the steam turbine generator works normally, sending a synchronization permission instruction to the DEH module through a synchronization device, further automatically adjusting the rotating speed of the steam turbine generator to adapt to the frequency of the power grid, and merging the steam turbine generator into the power grid after the synchronization condition is met; increasing a preset valve position of a high-speed regulating valve, judging active power, if the active power does not reach a preset initial load, continuously increasing the valve position, and pulling up the active power until the preset initial load is reached; and judging the reactive power of the turbonator, if the reactive power is a negative number, sending a pulse instruction to an excitation device for magnetization, and completing automatic grid connection until the reactive power is a positive number. The invention can realize one-key grid connection and reactive power regulation, improve the power generation benefit, reduce the personnel operation, shorten the time consumption of grid connection and reduce the possible technical effects of misoperation.
Description
Technical Field
The invention belongs to the field of industrial automation systems, and particularly relates to an automatic grid-connected method and system for a steam turbine generator.
Background
In the grid-connected process of the turbonator of the thermal power plant, the grid-connected process can be completed only by coordinating the turbonator, the demagnetization protection device, the excitation device and the synchronous device, wherein the personnel operation process is complex, and the misoperation of partial precondition is easy to ignore.
In the prior art, a control module and a generator body are adopted, the control module comprises a controller and a detection unit connected with the controller, a field-extinguishing switch, an excitation device and a synchronous device, and further comprises an overload protection device, the overload protection device comprises a protection circuit, a first current sensor, an overcurrent protector and a direct current converter are arranged on the protection circuit, the overload protection device further comprises a manual cut-off control device, the manual cut-off control device comprises a fixed contact and a movable contact which are connected to the protection circuit, and the protection circuit is disconnected between the fixed contact and the movable contact.
The prior art therefore has the following disadvantages: the method is only to simply and automatically transform related grid-connected de-excitation, excitation and synchronization devices, does not realize a one-key grid-connected function in the true sense, and does not include initial load regulation and reactive power regulation after grid connection.
Disclosure of Invention
The invention aims to provide an automatic grid-connection method and system for a steam turbine generator, so as to realize one-key grid connection and reactive power regulation, improve the power generation benefit, reduce the personnel operation, shorten the time consumption of grid connection and reduce the possible technical effects of misoperation.
In order to solve the problems, the technical scheme of the invention is as follows:
an automatic grid connection method for a steam turbine generator comprises the following steps:
judging a starting condition, and if the starting condition is met, starting grid connection;
starting the excitation device, the de-excitation device and the synchronization device in sequence to enter a working state;
if the steam turbine generator works normally, sending a synchronization allowing instruction to the DEH module through a synchronization device, further automatically adjusting the rotating speed of the steam turbine generator to adapt to the frequency of the power grid, and merging the steam turbine generator into the power grid after synchronization conditions are met;
increasing a preset valve position of a high-speed regulating valve, judging active power, if the active power does not reach a preset initial load, continuously increasing the valve position, and pulling up the active power until the preset initial load is reached;
and judging the reactive power of the turbonator, if the reactive power is a negative number, sending a pulse instruction to an excitation device for magnetization, and completing automatic grid connection until the reactive power is a positive number.
Specifically, the starting conditions include that the rotation speed of the turbonator is within a rated rotation speed, a protection pressure plate of the de-excitation device is in a disconnected state, the synchronous device is in an automatic quasi-synchronous mode, the excitation device is in an automatic mode and a constant power factor state, and the de-excitation device, the synchronous device and the excitation device do not give an alarm.
Wherein the rated rotating speed is 2993-3007 revolutions.
Specifically, starting the excitation means into the operative state comprises in particular the steps of,
starting the excitation device to be excited, if the excitation device does not give an alarm after 15 seconds and the three-phase voltage is within the range of 10-10.5kV, entering the step of starting the de-excitation device, otherwise, pausing and checking the excitation device.
Specifically, starting the de-excitation device to enter the working state specifically comprises the following steps,
closing a protection pressing plate of the de-excitation device, receiving a closing instruction of the protection pressing plate, automatically clearing the alarm signal of the de-excitation device, if the alarm signal cannot be cleared, suspending and checking the de-excitation device, and starting the synchronous device until all the alarm signals are cleared.
In particular, the step of starting the contemporaneous device into the operating state comprises in particular the steps of,
and automatically clearing the alarm signals of the synchronous devices, suspending and checking the synchronous devices if the alarm signals cannot be cleared, and sending synchronous permission instructions to the DEH module through the synchronous devices until all the alarm signals are cleared.
Wherein the pulse command is 300ms.
An automatic grid-connected system for a turbonator comprises
The device comprises a control module, an excitation device, a de-excitation device, a synchronization device and a DEH module;
the control module is respectively in signal connection with the excitation device, the de-excitation device, the synchronization device and the DEH module and is used for sequentially starting the excitation device, the de-excitation device and the synchronization device to enter a working state; if the operation is normal, a synchronization permission instruction is sent to the DEH module through the synchronization device, then automatically adjusting the rotation speed of the steam turbine generator to adapt to the frequency of the power grid, and merging the steam turbine generator into the power grid after the synchronous condition is achieved; increasing a preset valve position of a high-speed regulating valve, judging active power, if the active power does not reach a preset initial load, continuously increasing the valve position, and pulling up the active power until the preset initial load is reached; judging the reactive power of the turbonator, if the reactive power is a negative number, sending a pulse instruction to an excitation device for magnetization, and completing automatic grid connection until the reactive power is a positive number;
the excitation device is controlled by the control module and is used for providing a working magnetic field for the turbonator;
the de-excitation device is controlled by the control module and is used for protecting the turbonator;
the synchronous device is controlled by the control module and used for detecting the grid frequency, the voltage amplitude and the voltage phase at two sides of a grid-connected point so as to realize grid connection;
the DEH module is controlled by the control module and used for adjusting the rotating speed of the steam turbine generator.
Specifically, the starting conditions include that the rotation speed of the turbonator is within a rated rotation speed, a protection pressure plate of the de-excitation device is in a disconnected state, the synchronous device is in an automatic quasi-synchronous mode, the excitation device is in an automatic mode and a constant power factor state, and the de-excitation device, the synchronous device and the excitation device do not give an alarm.
Specifically, the control module sends an instruction to an excitation device, the excitation device is started to be excited, if the excitation device does not give an alarm after 15 seconds and the three-phase voltage is within the range of 10-10.5kV, the step of starting a de-excitation device is carried out, and otherwise, the excitation device is paused and checked;
the control module sends an instruction to the de-excitation device, a protection pressing plate of the de-excitation device is closed, after the control module receives the closing instruction of the protection pressing plate, the alarm signal of the de-excitation device is automatically cleared, if the alarm signal cannot be cleared, the de-excitation device is paused and checked, and the step of starting the synchronous device is carried out until all the alarm signals are cleared;
the control module sends an instruction to the synchronizing device to automatically clear the alarm signal of the synchronizing device, and if the alarm signal cannot be cleared, the synchronizing device is suspended and checked until all the alarm signals are cleared, and then a synchronizing permission instruction is sent to the DEH module through the synchronizing device.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
the method is used for solving the problem of complicated manual operation of the turbonator in the processes of grid connection and power adjustment, and can safely and effectively finish the target of grid connection power generation in the fastest time. And the reactive power adjustment is automatically completed, the active power output is increased, and the power generation efficiency is improved. The process comprises a one-key grid-connected control system, and a DEH system coordinates and controls excitation, field suppression, synchronization and grid connection processes by taking the one-key grid-connected control system as a core.
The invention also comprises initial load and automatic reactive power adjustment in the one-key grid connection process, which is more advanced than other prior arts; the initial load is automatically adjusted, and the occurrence of reverse power is reduced; the reactive power is automatically adjusted, the line loss is reduced, the active power output of the generator is improved, and the power generation benefit is increased.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a flow chart of an automatic grid connection method for a steam turbine generator according to the present invention;
FIG. 2 is an overall flow chart of an automatic grid connection method for a steam turbine generator according to the present invention;
FIG. 3 is a display interface diagram of an automatic grid-connected system for a steam turbine generator according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. Moreover, in the interest of brevity and understanding, only one of the components having the same structure or function is illustrated schematically or designated in some of the drawings. In this document, "one" means not only "only one" but also a case of "more than one".
The following describes a method and a system for automatically connecting a steam turbine generator to a grid in accordance with the present invention in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Example 1
Referring to fig. 1 and 2, the embodiment provides an automatic grid connection method for a steam turbine generator, which includes the following steps:
firstly, in step S1, whether starting conditions are met is judged, and only when all the starting conditions are met, the grid connection is allowed to be started, namely, a one-key grid connection button is clicked. Specifically, the starting conditions include that the rotation speed of the steam turbine generator is within a rated rotation speed, and the rated rotation speed is within a range of 3000 plus or minus 7 revolutions. The protection pressing plate of the de-excitation device is in a disconnected state, the synchronization device is in an automatic quasi-synchronization mode, the excitation device is in an automatic mode and is in a constant power factor state, and the de-excitation device, the synchronization device and the excitation device do not give an alarm.
And then, in step S2, a switch instruction is sent out through the control module, and the excitation device, the de-excitation device and the synchronization device are sequentially started to enter a working state. Starting an excitation device to be excited, if the excitation device does not give an alarm after 15 seconds and the three-phase voltage is within the range of 10-10.5kV, entering the next step, otherwise, suspending the operation of the next step, giving an alarm and guiding manual inspection of the excitation device. And closing the protection pressing plate of the de-excitation device, entering the next step after receiving a closing instruction of the protection pressing plate, otherwise suspending the operation of the next step, giving an alarm and guiding the manual work to check the de-excitation device. And then, automatically clearing the alarm signals of the de-excitation device, if the alarm signals cannot be cleared, suspending the program and requesting manual inspection of the de-excitation device until all the alarm signals are cleared, and then entering the next step. And automatically clearing the alarm signals of the synchronous devices, if the alarm signals cannot be cleared, suspending the program and requesting manual inspection of the synchronous devices until all the alarm signals are cleared, and entering the next step.
Next, in step S3, a synchronization permission instruction is sent to the DEH module by the synchronization means. If all the devices have no alarm and the DEH module receives a synchronous permission instruction, the next step is carried out, otherwise, the operation is suspended and the reason is manually detected. And then the DEH module enters a synchronization mode, a synchronization device starts a synchronization increase and decrease mode, the rotating speed of the steam turbine generator is automatically adjusted to adapt to the frequency of the power grid, and the steam turbine generator is merged into the power grid after synchronization conditions are met. This process is typically completed within 20 seconds and proceeds to step S4 after completion.
Further, in step S4, the preset valve position of the high-pressure valve (generally 6%, the value is adjusted according to the actual condition) is automatically raised, and the initial load is applied. And judging the active power, if the active power does not reach the preset initial load, continuing to increase the valve position, and pulling up the active power until the active power reaches the preset initial load and then entering the next step.
And finally, in step S5, judging the reactive power of the turbonator, if the reactive power is a negative number, sending a pulse instruction of 300ms to an excitation device for magnetization, and until the reactive power is a positive number, thereby completing automatic grid connection.
Example 2
Referring to fig. 3, the present embodiment provides an automatic grid connection system for a steam turbine generator, which carries and executes the automatic grid connection method for a steam turbine generator according to embodiment 1, including a control module, an excitation device, a demagnetization device, a synchronization device, and a DEH module.
The control module is respectively in signal connection with the excitation device, the de-excitation device, the synchronization device and the DEH module and is used for controlling the devices and the modules to complete automatic grid connection. The starting condition needs to be judged before the control module implements automatic grid connection, if the starting condition is met, one-key automatic grid connection is started, and whether the starting condition is met or not can be clearly seen from a front-end control panel associated with the control module. Specifically, the starting conditions include that the rotation speed of the turbonator is within a rated rotation speed, a protection pressure plate of the de-excitation device is in a disconnected state, the synchronous device is in an automatic quasi-synchronous mode, the excitation device is in an automatic mode and a constant power factor state, and the de-excitation device, the synchronous device and the excitation device do not give an alarm.
The specific implementation process is as follows, the control module sends a switching value instruction to the excitation device, and the excitation device is excited. The control module can also monitor the excitation device, if the excitation device does not give an alarm after 15 seconds and the three-phase voltage is within the range of 10-10.5kV, the control module continues, otherwise, the control module pauses and guides the manual inspection of the excitation device. The excitation device is used for providing a stator power supply for the stator of the generator and providing a working magnetic field for the generator.
And then, the control module sends a switching value instruction to the de-excitation device to close a protection pressing plate of the de-excitation device. And after successful closing, feeding back a protective pressing plate closing instruction to the control module, continuing if the control module successfully receives the instruction, otherwise, pausing and requesting for inspection. And then, the control module sends a clearing instruction to the de-excitation device to enable the alarm signal of the de-excitation device to be automatically cleared, if the alarm signal cannot be cleared, the de-excitation device is suspended and checked until all the alarm signals are cleared, and then the operation is continued. The field-extinguishing device is a field-extinguishing protection device, and the stored energy in the magnetic field of the rotor excitation winding of the generator is quickly consumed to protect the generator.
Then, the control module sends a clearing instruction to the synchronizing device to automatically clear the alarm signal of the synchronizing device. If the alarm signals which cannot be cleared exist, the synchronous device is suspended and checked, and the next step is carried out until all the alarm signals are cleared. The synchronization device is used for detecting whether the grid frequency, the voltage amplitude and the voltage phase on two sides of a grid-connected point meet conditions or not so as to assist in manual grid connection or realize automatic grid connection. The automatic quasi-synchronization mode is characterized in that a synchronization device automatically monitors voltage difference and frequency difference, analyzes and calculates a proper synchronization moment, and sends a closing command in advance of a lead time to ensure that synchronization grid connection is completed at an ideal angle, and is different from a manual synchronization mode.
Under the control of the control module, the synchronization device sends a synchronization permission signal to the DEH module. If the excitation device, the synchronization device and the de-excitation device do not have alarm at the moment, and the DEH module receives a synchronization permission instruction, continuing, otherwise, pausing and manually checking the reason of the alarm. The DEH module enters a synchronization mode, and a synchronization device starts a synchronization increasing and decreasing mode. At the moment, the DEH module automatically adjusts the rotating speed of the steam turbine generator to adapt to the frequency of the power grid, and when the synchronous condition is met, the synchronous device enables the generator to be connected into the power grid. Typically this process is completed in 20 seconds and the control system will receive a signal that the generator outlet switch is connected to the grid. If not, the synchronization device and the DEH module need to be manually checked. Then, the control module sends an instruction to the DEH module to automatically raise the valve position (generally 6%, the value is adjusted according to the actual situation) of a certain high-pressure regulating valve, and the DEH module carries an initial load. And if the active power of the generator does not reach the preset initial load, continuously sending an instruction to enable the DEH module to continuously increase the valve position and pull up the active power until the preset initial load is reached, and then turning to the next step. The control module checks the reactive power of the generator, and if the reactive power is a negative number, a pulse instruction of 300ms is sent to the excitation system to increase the magnetization of the excitation system until the detected reactive power is a positive number. When the front-end control board of the control system displays that the grid connection is successful and has an initial load, the reactive power adjustment is completed, and the one-key grid connection function is completed.
The DEH module is a digital electro-hydraulic control module of the steam turbine and has the function of adjusting the rotating speed of the steam turbine according to a synchronous instruction when the steam turbine is connected to the power grid. The high-pressure regulating valve is an air inlet regulating valve of the turbonator, and the control of the generating load of the unit is realized by controlling the regulating valve.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (10)
1. An automatic grid connection method for a steam turbine generator is characterized by comprising the following steps:
judging a starting condition, and if the starting condition is met, starting grid connection;
starting the excitation device, the de-excitation device and the synchronization device in sequence to enter a working state;
if the steam turbine generator works normally, sending a synchronization permission instruction to the DEH module through the synchronization device, further automatically adjusting the rotating speed of the steam turbine generator to adapt to the frequency of the power grid, and merging the steam turbine generator into the power grid after the synchronization condition is met;
increasing a valve position preset by a high-speed regulating valve, judging active power, if the active power does not reach a preset initial load, continuously increasing the valve position, and pulling up the active power until the preset initial load is reached;
and judging the reactive power of the turbonator, if the reactive power is a negative number, sending a pulse instruction to the excitation device for magnetization, and completing automatic grid connection until the reactive power is a positive number.
2. The automatic grid-connection method for the turbonator according to claim 1, wherein the starting conditions comprise that the rotation speed of the turbonator is within a rated rotation speed, a protection pressure plate of the de-excitation device is in a disconnected state, the synchronization device is in an automatic quasi-synchronization mode, the excitation device is in an automatic mode and a constant power factor state, and the de-excitation device, the synchronization device and the excitation device do not give an alarm.
3. The automatic grid-connection method for the steam turbine generator according to claim 2, wherein the rated rotating speed is 2993-3007 revolutions.
4. The automatic grid-connection method for the steam turbine generator according to claim 1, characterized in that the step of starting the excitation device to enter the working state comprises in particular the steps of,
starting the excitation device to be excited, if the excitation device does not give an alarm after 15 seconds and the three-phase voltage is within the range of 10-10.5kV, entering the step of starting the de-excitation device, otherwise, pausing and checking the excitation device.
5. The automatic grid-connection method for the steam turbine generator according to claim 4, characterized in that the step of starting the demagnetization device to enter the working state specifically comprises the steps of,
closing the protection pressing plate of the de-excitation device, receiving a closing instruction of the protection pressing plate, automatically clearing the alarm signal of the de-excitation device, suspending and checking the de-excitation device if the alarm signal cannot be cleared, and starting the synchronous device until all the alarm signals are cleared.
6. The automatic grid connection method for the steam turbine generator according to claim 5, characterized in that starting the synchronization means to enter the working condition comprises in particular the steps of,
and automatically clearing the alarm signals of the synchronizing devices, suspending and checking the synchronizing devices if the alarm signals cannot be cleared, and sending synchronizing permission instructions to the DEH module through the synchronizing devices until all the alarm signals are cleared.
7. The automatic grid-connection method for the steam turbine generator according to claim 1, wherein the pulse command is 300ms.
8. An automatic grid-connected system for a turbonator is characterized by comprising
The device comprises a control module, an excitation device, a de-excitation device, a synchronization device and a DEH module;
the control module is respectively in signal connection with the excitation device, the demagnetization device, the synchronization device and the DEH module and is used for sequentially starting the excitation device, the demagnetization device and the synchronization device to enter a working state; if the steam turbine generator works normally, sending a synchronization permission instruction to the DEH module through the synchronization device, further automatically adjusting the rotating speed of the steam turbine generator to adapt to the frequency of the power grid, and merging the steam turbine generator into the power grid after the synchronization condition is met; increasing a preset valve position of a high-speed regulating valve, judging active power, if the active power does not reach a preset initial load, continuously increasing the valve position, and pulling up the active power until the preset initial load is reached; judging the reactive power of the turbonator, if the reactive power is a negative number, sending a pulse instruction to the excitation device for magnetization, and completing automatic grid connection until the reactive power is a positive number;
the excitation device is controlled by the control module and is used for providing a working magnetic field for the turbonator;
the de-excitation device is controlled by the control module and is used for protecting the steam turbine generator;
the synchronous device is controlled by the control module and used for detecting the grid frequency, the voltage amplitude and the voltage phase at two sides of a grid-connected point so as to realize grid connection;
the DEH module is controlled by the control module and used for adjusting the rotation speed of the steam turbine generator.
9. The automatic grid-connected system for the turbonator of claim 8, wherein the starting conditions include that the rotation speed of the turbonator is within a rated rotation speed, a protection pressing plate of the de-excitation device is in a disconnected state, the synchronization device is in an automatic quasi-synchronization mode, the excitation device is in an automatic mode and a constant power factor state, and the de-excitation device, the synchronization device and the excitation device do not have an alarm.
10. The automatic grid connection system for a steam turbine generator according to claim 9,
the control module sends an instruction to the excitation device, the excitation device is started to be excited, if the excitation device does not give an alarm after 15 seconds and the three-phase voltage is within the range of 10-10.5kV, the step of starting the de-excitation device is carried out, and if the three-phase voltage is not within the range of 10-10.5kV, the excitation device is paused and checked;
the control module sends an instruction to the de-excitation device to close a protection pressing plate of the de-excitation device, the control module automatically clears an alarm signal of the de-excitation device after receiving a closing instruction of the protection pressing plate, if the alarm signal cannot be cleared, the de-excitation device is paused and checked, and the synchronous device starting step is carried out until all the alarm signals are cleared;
the control module sends an instruction to the synchronizing device, automatically clears the alarm signal of the synchronizing device, pauses and checks the synchronizing device if the alarm signal cannot be cleared, and sends a synchronizing permission instruction to the DEH module through the synchronizing device until all the alarm signals are cleared.
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| CN202210708196.4A CN115425675A (en) | 2022-06-22 | 2022-06-22 | Automatic grid connection method and system for steam turbine generator |
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