CN-121979014-A - Method and system for starting and deducting static variable-frequency starting device of gas turbine generator set

CN121979014ACN 121979014 ACN121979014 ACN 121979014ACN-121979014-A

Abstract

The invention belongs to the technical field of static variable frequency starting, and provides a method and a system for starting and deducting a static variable frequency starting device of a gas turbine generator set, wherein a gas turbine generator model is built according to parameters of the static variable frequency starting device of the gas turbine generator set; the method comprises the steps of constructing a white box device level model for describing a static variable frequency starting device of a gas turbine generator set based on a gas turbine generator model, constructing a control strategy for realizing power factor optimization by adjusting exciting electromotive force of a motor to form a white box control level model, controlling the white box device level model by the white box control level model, and utilizing the white box control level model and the white box device level model to realize starting deduction. The invention can realize efficient and accurate SFC starting deduction of the gas turbine generator set and provides important technical support for links such as equipment specification research, electrical scheme design, operation mode formulation and the like of the gas turbine generator set.

Inventors

FAN XIAO
FAN RONG
De Siyu
WEI HUADONG
NIE YAN
WANG YAN
LI WEI
LI YING
LIU SHILING
CHEN PING
YANG CHAOHUI

Assignees

山东电力工程咨询院有限公司

Dates

Publication Date: 20260505
Application Date: 20251209

Claims (10)

1. The method for starting and deducting the static variable frequency starting device of the gas turbine generator set is characterized by comprising the following steps of: according to parameters of a static variable frequency starting device of the gas turbine generator set, a gas turbine generator model is constructed; based on the gas turbine generator model, a white box device level model for describing a static variable frequency starting device of the gas turbine generator set is constructed; constructing a control strategy for realizing power factor optimization by adjusting the exciting electromotive force of the motor, and forming a white box control level model; The white box device level model is controlled by the white box control level model, and starting deduction is achieved by using the white box control level model and the white box device level model.
2. The method for starting and deducting the static variable frequency starting device of the gas turbine generator set according to claim 1, wherein the specific content of the starting control strategy of the static variable frequency starting device of the gas turbine generator set comprises the following steps: The turning rotating speed stage comprises turning starting, accelerating to the turning rotating speed, switching on a starter of a static variable frequency starting device, and establishing and maintaining the rotor voltage; The sequential control stage comprises the steps of sending a starting instruction to a starter of a static variable frequency starting device, dragging a gas turbine generator set by the starter, increasing the speed to a purging rotating speed, and executing a purging program on the gas turbine; And executing an ignition program on the gas turbine, namely reducing the current output of the starter to the stator of the generator to 0, reducing the rotating speed of the gas turbine from the purging rotating speed to the ignition rotating speed, and executing the ignition operation. The starter resumes the current output to the stator of the generator, under the combined action of the output power of the starter and the self-power of the gas turbine, the rotation speed of the gas turbine is increased to a self-sustaining rotation speed; Executing a tripping procedure on the gas turbine, namely continuously increasing the rotating speed of the gas turbine to the tripping rotating speed, opening the starter, and finishing tripping; And the control stage of the rotating speed regulating system is to increase the speed of the unit to the working rotating speed under the control of the rotating speed regulating system and perform grid-connected power generation.
3. The method for starting and deducting the static variable frequency starting device of the gas turbine generator set according to claim 1, wherein the process of constructing the gas turbine generator model comprises the steps of setting a rotor structure as a non-salient pole machine, setting the number of Q-axis damping windings to be 2, completing the non-salient pole machine type setting, and configuring an excitation system model for minimizing power supply capacity according to parameters of the static variable frequency starting device of the gas turbine generator set.
4. The method for starting and deducting a static variable frequency starting device of a gas turbine generator set according to claim 3, wherein in the process of configuring an excitation system model for minimizing power supply capacity, a reactive power reference value Q ref of a synchronous motor is set to 0, a deviation Q e between Q ref and a reactive power measured value is calculated, and an excitation voltage signal E f is generated after the deviation passes through a PI controller.
5. The method for starting and deducting the static variable frequency starting device of the gas turbine generator set according to claim 4, wherein the excitation system model for minimizing the power supply capacity is suitable for simulation calculation for evaluating the minimum starting performance requirements, and the excitation system model for minimizing the power supply capacity is replaced by a white box model of an actual exciter when the characteristics under different operation conditions are analyzed.
6. The method for starting and deducting the static variable frequency starting device of the gas turbine generator set according to claim 1, wherein the white box device level model comprises 3 input signals and 6 electric nodes, the input signal nodes respectively represent voltage reference instruction arrays of different phase power supplies of the starter, the electric nodes respectively represent each phase output terminal of the starter and are used for driving a motor to operate, and each phase input terminal is connected with a bus of a plant.
7. The method of starting a static variable frequency starting apparatus for a gas turbine generator set as defined in claim 6, wherein each set of voltage reference commands comprises phase, frequency and amplitude reference commands.
8. The method of claim 1, wherein the white box device level model is configured to click on the white box device level model to present a three-phase controllable ac voltage source simplest topology, wherein the three-phase ac power source is simulated by 3 controllable ac voltage sources, and the voltage amplitude, the voltage frequency and the voltage phase of the voltage sources are determined by a voltage reference command array and are connected with a motor armature terminal through an electrical node.
9. The method for starting and deducting the static variable-frequency starting device of the gas turbine generator set according to claim 1, wherein the control-level white box model comprises a low-speed jigger control model, an SFC starter control model and a one-key starting control model of the gas turbine generator set, wherein the low-speed jigger control model is used for simulating the mechanical characteristics of the jigger device, wherein input pins respectively represent the rated rotating speed of the jigger device and the real-time rotating speed of the gas turbine generator set; The SFC starter control model is used for simulating the data acquisition, state analysis and instruction generation functions of the SFC control protection system, sending phase, frequency and voltage amplitude instructions of a three-phase alternating current power supply to the power circuit module, and receiving operation instructions of the gas turbine generator set one-key starting control white box model, wherein input pins comprise an operation mode, a rotating speed signal, a torque signal and a motor state signal; the one-key start control model of the gas turbine generator set is used for simulating a one-key sequential control strategy of the automatic start flow of the gas turbine generator set.
10. The utility model provides a gas turbine generator set static frequency conversion starting drive starts deduction system which characterized in that includes: The gas turbine generator model building module is configured to build a gas turbine generator model according to parameters of the static variable frequency starting device of the gas turbine generator set; The white box device level model construction module is configured to construct a white box device level model for describing a static variable frequency starting device of the gas turbine generator set based on the gas turbine generator model; The white box control level model construction module is configured to construct a control strategy for realizing power factor optimization by adjusting exciting electromotive force of the motor to form a white box control level model, wherein the white box device level model is controlled by the white box control level model, and starting deduction is realized by utilizing the white box control level model and the white box device level model.

Description

Method and system for starting and deducting static variable-frequency starting device of gas turbine generator set Technical Field The invention belongs to the technical field of static variable frequency starting, and particularly relates to a method and a system for starting and deducting a static variable frequency starting device of a gas turbine generator set. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. With energy structure transformation and construction of a novel power system, capacity and permeability of new energy units such as wind power, photovoltaic and the like are continuously increased, and the power grid is increasingly urgent in flexible resource demand with rapid adjustment capability. The gas turbine generator set has the advantages of quick start, high efficiency, small pollution and the like, and has obvious technical advantages and wide application prospect in aspects of power grid peak regulation, frequency modulation and the like. In order to improve the operation flexibility of the power system, the gas turbine generator set is frequently started and stopped. Thus, transient characteristics of the unit start-up process have a significant impact on the operational life of the equipment, station safety, economics. In engineering practice, torque pulsation, mechanical resonance, equipment overheating, low energy efficiency and the like may occur in the starting process of the gas turbine generator set. In order to improve the starting performance of the unit, the starting mode of the heavy-duty gas turbine generator unit is mainly based on the SFC frequency conversion synchronous dragging technical route. A gas turbine generator set starting system taking SFC as core equipment realizes stable and safe starting of a gas turbine by controlling the rotating speed and the load. However, in the SFC start-up process, electromagnetic transients and electromechanical transients are coupled to each other, and the time-varying characteristics of the physical quantities such as start-up power, rotor speed and torque are complex and susceptible to start-up failure caused by external disturbances. Disclosure of Invention In order to solve the problems, the invention provides a method and a system for starting and deducting the static variable-frequency starting device of a gas turbine generator set, which can realize efficient and accurate SFC starting and deducting of the gas turbine generator set and provide important technical support for links such as equipment specification research, electrical scheme design, operation mode formulation and the like of the gas turbine generator set. According to some embodiments, the present invention employs the following technical solutions: a method for starting and deducting a static variable frequency starting device of a gas turbine generator set comprises the following steps: according to parameters of a static variable frequency starting device of the gas turbine generator set, a gas turbine generator model is constructed; based on the gas turbine generator model, a white box device level model for describing a static variable frequency starting device of the gas turbine generator set is constructed; constructing a control strategy for realizing power factor optimization by adjusting the exciting electromotive force of the motor, and forming a white box control level model; The white box device level model is controlled by the white box control level model, and starting deduction is achieved by using the white box control level model and the white box device level model. As an alternative embodiment, the specific contents of the starting control strategy of the static variable frequency starting device of the gas turbine generator set include: The turning rotating speed stage comprises turning starting, accelerating to the turning rotating speed, switching on a starter of a static variable frequency starting device, and establishing and maintaining the rotor voltage; The sequential control stage comprises the steps of sending a starting instruction to a starter of a static variable frequency starting device, dragging a gas turbine generator set by the starter, increasing the speed to a purging rotating speed, and executing a purging program on the gas turbine; And executing an ignition program on the gas turbine, namely reducing the current output of the starter to the stator of the generator to 0, reducing the rotating speed of the gas turbine from the purging rotating speed to the ignition rotating speed, and executing the ignition operation. The starter resumes the current output to the stator of the generator, under the combined action of the output power of the starter and the self-power of the gas turbine, the rotation speed of the gas turbine is increased to a self-sustaining rotation speed; Executing a tripping procedure on the