The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, nonlinear H∞ controller problem in large-scale systems is investigated. The paper needs to find an energy function which satisfies the Hamilton Jacobi inequality. The energy function of the whole large scale system is considered to be the sum of the energy functions of the isolated subsystems. When the inequality is solved, a decentralized state feedback controller for each subsystem...
Marine diesel-generator speed-frequency control system based on sliding mode control (SMC) scheme is introduced in this paper, which is capable of providing good and consistent speed-frequency control performance, despite wide variations in the system operating conditions. The SMC scheme consists of a conventional governor based on a standard speed error signal, and an auxiliary loop incorporating...
This paper deals with designing of Power System Stabilizer (PSS) based on Imperialist Competitive Algorithm (ICA) to improve the stability of power system. The proposed algorithm has been applied on a Single Machine Infinite Bus (SMIB) system where the coefficients of PSS controller has been optimized by ICA. The system with proposed controller has been simulated for the special disturbance in input...
The paper deals with a general formulation of the optimal active change detection and control problem for stochastic systems, which includes several design problems as special cases. The special case treated in this paper can be characterized as a decision making problem where decisions are transformed into inputs of a system and the aim is to control the system. The utilization of the general formulation...
As one of the future most popular vehicles, Hybrid Electric Vehicle has to satisfy the challenging and often conflicting requirements. Environment concerns have motivated the legislated action by government around the world to reduce nocuous emissions. The requirements for reduction of CO2 need a high fuel economy. The people's demands for low cost and efficient require a high reliability control...
This paper presents a optimal control and allocation strategy for Internal combustion-Linear Generator integrated Power System (ICLGIPS), the main objective of the strategy is to improve efficiency of the system. Linear generator (LEG) works alternately as electromotor and generator during one work period, energy storage device converts and transfers energy between power source and LEG, energy conversion...
An adaptive second order sliding mode control strategy is explored in this work, to maximize the energy extracted from the wind in a wind energy conversion system (WECS). It is required to such strategy to deal with the nonlinear nature of the WECS, the randomness of the wind speed, model uncertainties and external disturbances, and also with the need to reduce mechanical loads. The special features...
A fuzzy-neuro controller has been designed to stabilize the frequency and voltage output of a synchronous generator. The structure of the proposed control system consists of two PI -like fuzzy controllers and two neural networks. With this control scheme, difficulty for tuning scale factors of the fuzzy controller is reduced. Simulation results show that the system is robust to drastic changes on...
When the wind speed is above the rated value, pitch angle is regulated to maintain the constant power output in order to limit the wind turbine speed and power because of the mechanical load limit of the mechanical structure and the electric load limit of the electric components. After the mathematical model for the wind energy conversion system and the mechanism of pitch angle control system was...
A multivariable control strategy based on model predictive control techniques for the control of variable speed variable pitch wind turbines is proposed. The proposed control strategy is described for the whole operating region of the wind turbine (both partial and full load regimes). Pitch angle and generator torque are controlled simultaneously to maximize energy capture, mitigate drive train transient...
Recent advancement in size and technology of wind energy conversion systems (WECSs) require sophisticated control systems to effectively optimize energy conversion and enhance grid integration. Doubly-fed induction generators (DFIG)-based WECS are the most promising and widely utilized technology. This study focuses on advanced controls development to identify and assess the critical loads and instabilities,...
A new excitation control system for synchronous generator based on DSP (TMS320F28335) is introduced in this paper. This paper analyzes the principles, structure and functions of the excitation control system in detail. Hardware design contains AD conversion module, digital signal input/output module, Controller Area Network (CAN) module, frequency measurement module and FRAM module. The software design...
This paper presents a new backstepping approach for a class of nonlinear systems which can be feedback linearized. Compared with conventional methods, requirements to the controlled systems are reduced; over-parameterized problem can be avoided; while the robustness to external disturbances and adaptivity to uncertain parameters of the controller are reserved. Based on this approach, robust adaptive...
In this paper, a design method based on nonsmooth, nonconvex optimization is applied to the design of power system controllers for improving small-signal stability. The design method was developed to solve the problem of the design of low order controllers using output feedback and incorporating robustness constraints. The method is applied to the problem of stabilization of a test system with only...
The use of distributed generators (DGs), especially renewables like wind and solar photovoltaics, depends upon inverter technology to provide compatibility between multiple DGs on a local bus. It is becoming more common to group dissimilar DGs together to form microgrids, and desirable to allow DGs to be connected or disconnected without detrimental effects upon the stability of the microgrid. This...
According to the special form and structure of concentrated wind energy turbine, and based on the idea of largely use of wind energy, the author designed an automatic control system, which can control the wind facing of wind turbine and change bladepsilas pitch angle. Under the control this system, the concentrated wind energy turbine can not only meet the demand of wind facing under normal conditions,...
In order to evaluate the robustness performance of process control system with uncertainties, four quantified stochastic robustness indices are introduced upon some typical stochastic variable ranking criteria. Based on them, four kinds of stochastic robust controller optimization problems are presented to meet the system requirements. To solve the multi-objective stochastic programming problems,...
Compared with constant speed constant frequency wind turbine, variable speed constant frequency wind turbine has many advantages: higher efficiency of wind energy converting to electric power, absorbing gust energy, smoothly cutting into the network system, flexible connecting between wind turbine and network system and low operating noise. Currently the variable speed constant frequency technology...
A new experiment for undergraduates showing voltage and frequency control of a small alternator for a two bus power system is introduced. Voltage and frequency controllers were designed in Simulink and implemented using dSPACE. A subsystem of the scaled down power system testbed developed at Florida International University was utilized to study the effects of varying load on the generator operating...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.