Study of the Speed Control System of a Heavy-Duty Gas Turbine

Gas turbine plays an important role in both the power generation and the frequency regulation of the power grid. In this paper, we have designed a speed control system for the heavy-duty gas turbine. Specifically, the speed control can be organized into four phases, including startup frequency converter (SFC), run-up ramp controller, speed/load controller and grid control center. Firstly, SFC determines the speed during the initial start-up period as the gas turbine and SFC are coaxial. Secondly, after SFC stops, the run-up ramp controller takes over the speed control until near the rated speed. Then, the speed/load controller is selected by a minimum selector to control the speed of the gas turbine. Finally, after synchronization with the power grid, the speed of the gas turbine depends on the frequency of the grid. In order to study the dynamic characteristics of the speed control system, a model of the gas turbine with its control system has been designed in SIMULINK based on the modular modeling method. The simulation results showed that the transient responses had good performances. So it seems that the speed control system that we designed could regulate the gas turbine during a variable condition.

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Research on the Hydropower Frequency Control Strategy for Power Delivery Grid Splitting

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.392.641 ◽

2013 ◽

Vol 392 ◽

pp. 641-645 ◽

Cited By ~ 1

Author(s):

Li Meng ◽

Hao Wang ◽

Jian She Tian

Keyword(s):

Control System ◽

Frequency Control ◽

Power Grid ◽

Speed Control ◽

Power Delivery ◽

Area Measurement ◽

Frequency Regulation ◽

Improvement Program ◽

Speed Control System ◽

Turbine Speed

After power delivery grid splitting off from the main power grid, there is the risk of over frequency generator tripping leading to low frequency load shedding action. Regulation characteristic of hydro-turbine speed control system for regional power grid is analyzed by using the measured parameters of hydropower. The turbine speed control effect is analyzed without lower limit of primary frequency regulation. Frequency control improvement program of hydropower generating units in isolated power system is proposed based on wide area measurement system. The scheme uses WAMS to collect power information as governor PID output lead, and to calculate power target into the speed control system.

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Modelling and Recoupling the Control Loops in a Heavy-Duty Gas Turbine Plant

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award ◽

10.1115/95-gt-061 ◽

1995 ◽

Cited By ~ 5

Author(s):

G. Crosa ◽

G. Ferrari ◽

A. Trucco

Keyword(s):

Control System ◽

Gas Turbine ◽

Linear Model ◽

Transfer Functions ◽

Heavy Duty ◽

Turbine Plant ◽

Exhaust Temperature ◽

Non Linear ◽

Gas Turbine Plant ◽

Heavy Duty Gas Turbine

This paper presents a dynamic simulation of a single shaft heavy-duty gas turbine plant, suitable for gas-steam combined cycles. The plant is operated at maximum gas turbine exhaust temperature, using variable inlet guide vanes (VIGV) as control. In the first section, a non-linear lumped parameter mathematical model is described: it includes a control system representative of those controls normally utilised by industry today. Some dynamic responses of a controlled plant taken as an example are presented. In the second section, a different control system is proposed, operating with no interaction between the speed and exhaust temperature loops. To this aim, a linear model in the frequency domain of the uncontrolled plant is obtained, starting from the non-linear model in the time domain. Assuming that each one of manipulated variables influences only one of the controlled variables (VIGV only the exhaust gas temperature and the fuel mass rate only the load), the transfer functions of two new blocks have been obtained. To compensate for the system non linearity, the calculations are repeated for different load levels. The new control feature can offer advantages in the time response of the regulated plant, especially in the operating range where the airflow can be modulated by the VIGV at constant fuel firing temperature.

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Application of SENLAN SB60 in Flow Variable Frequency Speed Control System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.860-863.2320 ◽

2013 ◽

Vol 860-863 ◽

pp. 2320-2323

Author(s):

Jiao Yue Liu ◽

Ju Qing Yang ◽

Lin Ma

Keyword(s):

Control System ◽

Flow Control ◽

Frequency Converter ◽

Asynchronous Motor ◽

Speed Control ◽

Output Frequency ◽

Speed Regulation ◽

Three Phase ◽

Speed Control System ◽

Voltage Signal

The frequency speed control system in flow control based on SENLAN SB60 frequency converter is made up of input set value and actual value which is the feedback voltage signal given by flow sensor, then adjusted by process PID automatic control, changes output frequency to regulate the speed of three-phase asynchronous motor to achieve the purpose of speed regulation, thus the tank's flow control can be obtained.

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