CN113178118B - Gas turbine starts grid-connected system based on movable mould emulation - Google Patents
Gas turbine starts grid-connected system based on movable mould emulation Download PDFInfo
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- CN113178118B CN113178118B CN202110455499.5A CN202110455499A CN113178118B CN 113178118 B CN113178118 B CN 113178118B CN 202110455499 A CN202110455499 A CN 202110455499A CN 113178118 B CN113178118 B CN 113178118B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/188—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for motors; for generators; for power supplies; for power distribution
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B9/00—Simulators for teaching or training purposes
Abstract
The invention discloses a gas turbine starting grid-connected system based on moving die simulation, and relates to the technical field of moving die simulation. The starting grid-connected system comprises a prime motor excitation module, a variable frequency speed regulation module, a prime motor, a generator excitation module, a static variable frequency module, an outlet circuit-breaking module, a unit measurement and control device and a synchronization device; the prime motor excitation module and the variable-frequency speed regulation module are respectively connected with a prime motor; the generator excitation module and the outlet open circuit module are respectively connected with a generator; the static frequency conversion module is connected with the generator through the outlet circuit breaking module; the unit measurement and control device measures and controls the generator and accesses a network monitoring system; the synchronization device detects the voltage, frequency and phase angle of the two sides of the circuit breaker to be connected. The starting grid-connected system and the network monitoring system are combined for simulation, and the starting grid-connected process of the gas turbine can be intuitively embodied.
Description
Technical Field
The invention relates to the technical field of moving die simulation, in particular to a gas turbine starting grid-connected system based on moving die simulation.
Background
Starting to grid connection of a large-scale gas turbine generator is a relatively complex process, and involves coordinated actions of a prime mover, an excitation system, a Static Frequency Converter (SFC), a synchronous device, a breaker, an earthing switch and the like under different parameter conditions.
As more and more gas turbine power plants are built into operation, there is an urgent need for associated operational training of the operating personnel. However, the existing practical training base dynamic simulation system can only simulate the grid connection process of a common coal-fired generator set, can not simulate the grid connection process of a complex large-scale gas turbine generator, or can only realize software simulation in a computer, can not be simulated by combining actual hardware equipment, and trainees can not contact actual equipment such as an excitation system, an SFC (small form-factor converter), a synchronization device and the like, so that intuitive training experience is difficult to achieve.
Disclosure of Invention
The invention aims to provide a gas turbine starting grid-connected system based on dynamic simulation, which is combined with a network monitoring system to carry out simulation so as to intuitively embody the operation and the process of starting grid-connected of a gas turbine.
In order to achieve the above object, an embodiment of the present invention provides a gas turbine startup grid-connected system based on dynamic simulation, which is characterized in that the startup grid-connected system is connected to a network monitoring system, and the startup grid-connected system includes a prime mover excitation module, a variable frequency speed control module, a prime mover, a generator excitation module, a static variable frequency module, an outlet open circuit module, a unit measurement and control device, and a synchronization device;
the prime motor excitation module and the variable-frequency speed regulation module are respectively connected with the prime motor;
the generator excitation module and the outlet circuit breaking module are respectively connected with the generator;
the static variable frequency module is connected with the generator through the outlet circuit breaking module;
the unit measurement and control device measures and controls the generator and is connected to the network monitoring system;
the synchronization device detects voltage, frequency and phase angle of two sides of the circuit breaker to be connected, if synchronization conditions are met, a circuit breaker closing instruction is sent out, and if the synchronization conditions are not met, an adjusting instruction is sent out aiming at the generator to enable the synchronization conditions to be met.
Preferably, the prime mover excitation module includes an automatic voltage regulator, a contactor, a prime mover excitation transformer, a fuse, and a field-off switch.
Preferably, the variable frequency speed regulation module comprises a speed regulation control cabinet and a frequency converter.
Preferably, the generator excitation module comprises an automatic voltage regulator, a generator excitation transformer, an excitation starting transformer, a rectifier, a contactor simulating a field suppression switch and a contactor simulating an excitation alternating current side switch.
Preferably, the static frequency conversion module comprises an isolation transformer, a rectifier, an inverter, a reactor, a contactor simulating a knife switch, and a rotor position judgment and logic control device.
Preferably, the outlet breaking module comprises a current transformer, a voltage transformer, an outlet breaker, an isolation switch and an earthing switch.
Preferably, the input ends of the prime mover excitation module, the variable frequency speed control module, the generator excitation module, the static variable frequency module and the outlet disconnection module are all connected with an alternating current power supply.
Preferably, the alternating current power supply is a 380V three-phase alternating current power supply.
Preferably, the prime mover is coaxially connected with the generator.
Preferably, the network monitoring system is used for executing a unit starting control strategy, coordinating the starting grid-connected system, realizing unit starting, idling, boosting, no-load and pseudo-synchronous operation, and controlling starting and stopping of the prime motor, the rotating speed of the generator, starting and stopping of the prime motor excitation module and the generator excitation module, manual-automatic switching of the synchronous device and the voltage at the generator end.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention solves the matching problem that the frequency conversion speed regulation module and the static frequency conversion module drive the coaxial prime motor and the generator independently or together in different stages of the analog starting of the grid-connected system. The device comprises a generator, a prime motor, a generator excitation module, a prime motor excitation module, a static frequency conversion module and the like, and a dynamic simulation control system, wherein the generator, the prime motor, the generator excitation module, the prime motor excitation module, the static frequency conversion module and the like are configured, real primary equipment is connected with secondary equipment, the starting, the rotating speed and the synchronous control of a unit are realized, and the starting and stopping process of the gas turbine generator is vividly and visually displayed.
(2) The generator excitation module, the static frequency conversion module, the synchronization device and the like can be used as actual teaching equipment to achieve visual teaching and training effects.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving die simulation according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving die simulation according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving die simulation according to a third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving die simulation according to a fourth embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving die simulation according to a fifth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving model simulation according to a sixth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
The existing practical training base dynamic simulation system can only simulate the grid-connection process of a common coal-fired generator set, can not simulate the grid-connection process of a complex large-scale gas turbine generator, or can only realize software simulation in a computer, can not be simulated by combining actual hardware equipment, trainees can not contact actual equipment such as an excitation system, an SFC (Static Frequency converter), a synchronous device and the like, and visual training experience is difficult to achieve.
The starting and grid-connection process of the large-scale gas turbine generator is complex, the large-scale gas turbine generator is dragged by the SFC during starting, the middle acceleration section has a special process of dragging by the prime motor and the SFC together, and finally the prime motor is dragged to be connected to the grid independently. The prime mover is also called as a power machine and is an important driving part in mechanical equipment. Prime mover refers to all machines which generate prime power by using energy, and includes heat engine, hydraulic engine, wind engine and electric motor; is the main source of the power needed in the modern production and living fields. The prime mover may provide the active power and various losses of the unit, including mechanical losses, electromagnetic losses, and the like. In the embodiment of the present invention, a synchronous motor is used as the prime mover, and in other embodiments, a heat engine, a water engine, a wind engine, or the like may be used as the prime mover in the embodiment of the present invention.
Due to the particularity of the practical training base, a prime motor can be simulated only by driving a motor by a frequency converter, and the problem of matching of the coaxial prime motor and a generator driven by the frequency converter and two sets of power electronic driving devices of the SFC is solved. According to one embodiment of the invention, small-sized equipment such as the solid generator, the prime motor, the excitation system and the SFC and a moving die simulation control system are configured, real primary equipment is connected with real secondary equipment, special control logic is adopted to realize the starting, the rotating speed and the synchronous control of the unit, and the starting and stopping processes of the gas turbine generator are vividly and visually displayed.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving simulation according to a first embodiment of the present invention. The starting grid-connected system provided by the invention is connected with a network monitoring system, and comprises a prime motor excitation module 10, a variable frequency speed regulating module 20, a prime motor 30, a generator 40, a generator excitation module 50, a static variable frequency module 60, an outlet disconnection module 70, a unit measurement and control device and a synchronization device; the prime motor excitation module 10 and the variable frequency speed regulation module 20 are respectively connected with a prime motor 30; the generator excitation module 50 and the outlet circuit break module 70 are respectively connected with the generator 40; the static frequency conversion module 60 is connected with the generator 40 through the outlet disconnection module 70; the unit measurement and control device measures and controls the generator 40 and accesses a network monitoring system; the synchronization device detects the voltage, frequency and phase angle of two sides of the circuit breaker to be combined, if synchronization conditions are met, a circuit breaker closing instruction is sent out, and if synchronization conditions are not met, an adjusting instruction is sent out aiming at the generator 40 to enable the synchronization conditions to be met.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving simulation according to a second embodiment of the present invention. In the embodiment of the invention, the prime motor excitation module 10 comprises a contactor KM2, a prime motor excitation transformer TM, fuses FU 1-3, a field-extinguishing switch FMK and an automatic voltage regulator.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving simulation according to a third embodiment of the present invention. In the embodiment of the present invention, the variable frequency speed control module 20 includes a speed control cabinet and a frequency converter.
The prime motor excitation module 10 and the variable frequency speed regulation module 20 are used for regulating the rotating speed of the prime motor 30, simulating the speed regulator of the prime motor and realizing the simulation of the starting, grid connection and operation of the unit. The frequency converter used in the variable frequency speed control module 20 is a standard industrial frequency converter, and the capacity of the frequency converter is matched with that of the prime motor 30.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving simulation according to a fourth embodiment of the present invention. In the embodiment of the present invention, the generator excitation module 50 includes a generator excitation transformer, an excitation start transformer, a rectifier, a contactor simulating a field-off switch, a contactor simulating an excitation ac side switch, and an automatic voltage regulator.
The generator excitation module 50 is a solid device, is provided with a complete large-scale generator set and a self-excitation system, only reduces the capacity of a power element, matches the excitation power with the generator, and meets the operation requirements of manual/automatic operation, forced excitation, forced reduction, field suppression, response speed, single-machine operation, parallel operation, reactive power distribution, realization of constant voltage, constant current, constant reactive power, constant power factor and the like. For better simulation, the generator excitation module 50 may further include a power cabinet cooling fan, an overvoltage protection and logic control system, and the like.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving simulation according to a fifth embodiment of the present invention. In the embodiment of the present invention, the static frequency conversion module 60 includes an isolation transformer T1, a rectifier and inverter SCR, a reactor LD, contactors DS and ICB simulating a knife switch, and a rotor position determination and logic control device.
The static frequency conversion module 60 is a physical device, a starting power supply is led from 380V, and after the starting power supply is rectified and frequency-converted by a special isolation transformer through a Static Frequency Converter (SFC) and then is input into a generator stator through an isolation switch, so that the unit is slowly accelerated to a self-sustaining rotating speed. A Static Frequency Converter (SFC) control system of the synchronous generator is completely matched with a synchronous generator set and an excitation system, so that the starting of the generator set is realized, and the requirements on rotating speed and current control are met. Complete large-scale combustion engine Static Frequency Conversion (SFC) system complete equipment is equipped, the power is reduced so as to be matched with a generator, and the starting operation of a unit is met. The system comprises an isolation transformer, a rectifier, an inverter, a reactor, a contactor simulating a disconnecting link, a rotor position judging and logic control system and the like. The generator outlet circuit breaker, the isolation disconnecting link, the grounding switch and the like are simulated by using a contactor.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a gas turbine startup grid-connected system based on moving simulation according to a sixth embodiment of the present invention. With combined reference to tables 1-3, table 1 shows a simulated gas turbine generator starting process, table 2 shows a simulated gas turbine generator normal shutdown process, and table 3 shows a simulated gas turbine generator accident shutdown process. In an embodiment of the present invention, the outlet breaking module 70 includes a current transformer, a voltage transformer, an outlet breaker GS101, isolation switches GS201 and GS202, and grounding switches GS301 and GS302.
In the embodiment of the present invention, the input ends of the prime mover excitation module 10, the variable frequency speed control module 20, the generator excitation module 50, the static variable frequency module 60 and the outlet disconnection module 70 are all connected to an ac power supply. Generally, the ac power supply is a 380V three-phase ac power supply.
In the present embodiment, the prime mover 30 is coaxially connected with the generator 40.
In the embodiment of the invention, the network monitoring system is used for executing a unit starting control strategy, coordinating and starting a grid-connected system, realizing unit starting, idling, boosting, no-load and pseudo-synchronous operation, and controlling the starting and stopping of a prime motor, the rotating speed of a generator 40, the starting and stopping of a prime motor excitation module 10 and a generator excitation module 50, manual and automatic switching of synchronous devices and the voltage of a machine end. The unit measurement and Control device can measure and Control the generator unit and is connected into a Network monitoring System (NCS) System. The synchronization device adopts an entity device, comprises functions of automatic quasi-synchronization, manual synchronization and the like, and can output signals of boosting, reducing voltage, accelerating, decelerating and the like.
In the embodiment of the invention, the generator set measuring and controlling device measures and controls the generator and is connected to a network monitoring system, and the method comprises the following steps: three-phase voltages on two sides of the generator breaker GS101 are measured, and the breaker GS101, the isolation disconnecting links GS201 and GS202 and the grounding switches GS301 and GS302 are controlled and monitored in position.
In the embodiment of the present invention, the synchronization apparatus detects the voltage, frequency and phase angle of the two sides of the circuit breaker to be merged, i.e. detects the voltage transformer 1YH and the voltage transformer 2YH (as shown in fig. 6) of the two sides of the circuit breaker GS 101.
In a specific embodiment, the unit start control strategy is implemented by the NCS, that is, a program and an operation picture need to be set in the NCS, the NCS coordinates excitation, the SFC, the prime mover (consisting of the motor and the frequency converter), the synchronization device and the related switch knife brake, so as to implement the start, idle running, boost, no-load, and pseudo-synchronization operation of the unit, and control the start/stop of the prime mover, the increase/decrease of the rotation speed, the input/exit of the excitation regulator, the manual/automatic conversion, the rise/decrease of the terminal voltage, and other functions. The main process is as follows: starting a prime motor, starting generator excitation, starting an SFC to bring the rotating speed to 700rpm, simulating to blow, reducing the rotating speed to 500rpm, bringing the rotating speed to 2200rpm by the SFC together with the prime motor, exiting the SFC, increasing the rotating speed to 3000rpm, and synchronously connecting the grid.
TABLE 1 simulation of the starting procedure of a gas turbine generator
TABLE 2 simulation of the Normal shutdown procedure of a gas turbine Generator
TABLE 3 simulation of the shutdown procedure of the gas turbine generator in case of accident
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A gas turbine starting grid-connected system based on dynamic simulation is characterized in that the starting grid-connected system is connected with a network monitoring system and comprises a prime motor excitation module, a variable frequency speed regulation module, a prime motor, a generator excitation module, a static variable frequency module, an outlet open circuit module, a unit measurement and control device and a synchronous device;
the prime motor excitation module and the variable-frequency speed regulation module are respectively connected with the prime motor and used for regulating the rotating speed of the prime motor and simulating the speed regulator of the prime motor;
the generator excitation module and the outlet circuit-breaking module are respectively connected with the generator, the generator excitation module is an entity device and is provided with complete equipment of a self-shunt excitation system of a large-scale generator set, the equipment is used for reducing the capacity of a power element, and the excitation power is matched with the generator;
the static variable frequency module is connected with the generator through the outlet circuit breaking module;
the unit measurement and control device measures and controls the generator and is connected to the network monitoring system;
the network monitoring system is used for executing a unit starting control strategy, coordinating the starting grid-connected system, realizing unit starting, idling, boosting, idling and pseudo synchronous operation, and controlling starting and stopping of a prime motor, rotating speed of a generator, starting and stopping of a prime motor excitation module and a generator excitation module, manual-automatic switching of a synchronous device and voltage at an outlet end of the generator; the starting grid-connected system is characterized in that a variable-frequency speed regulating module and a static variable-frequency module are used for driving a coaxial prime motor and a generator independently or together at different stages of simulated starting;
the synchronization device detects voltage, frequency and phase angle of two sides of the circuit breaker to be connected, if synchronization conditions are met, a circuit breaker closing instruction is sent out, and if the synchronization conditions are not met, an adjusting instruction is sent out aiming at the generator to enable the synchronization conditions to be met.
2. The dynamic simulation-based gas turbine startup grid-connection system according to claim 1, wherein the prime mover excitation module comprises an automatic voltage regulator, a contactor, a prime mover excitation transformer, a fuse and a field-off switch.
3. The moving die simulation-based gas turbine startup grid-connected system according to claim 1, wherein the variable frequency speed control module comprises a speed control cabinet and a frequency converter.
4. The gas turbine startup grid-connected system based on moving die simulation of claim 1, wherein the generator excitation module comprises an automatic voltage regulator, a generator excitation transformer, an excitation start transformer, a rectifier, a contactor simulating a field-off switch and a contactor simulating an excitation AC side switch.
5. The moving die simulation-based gas turbine starting grid-connected system according to claim 1, wherein the static frequency conversion module comprises an isolation transformer, a rectifier, an inverter, a reactor, a contactor simulating a knife switch, and a rotor position judgment and logic control device.
6. The moving die simulation-based gas turbine startup grid-connection system according to claim 1, wherein the outlet breaking module comprises a current transformer, a voltage transformer, an outlet breaker, an isolation switch and a grounding switch.
7. The gas turbine starting grid-connected system based on the moving die simulation as claimed in claim 1, wherein the input ends of the prime mover excitation module, the variable frequency speed control module, the generator excitation module, the static variable frequency module and the outlet disconnection module are all connected with an alternating current power supply.
8. The moving die simulation-based gas turbine startup grid-connection system according to claim 7, wherein the ac power supply is a 380V three-phase ac power supply.
9. The moving-simulation-based gas turbine startup grid connection system according to claim 1, wherein the prime mover is coaxially connected with the generator.
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