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This paper provides a methodology to extract the dynamic real time model of an electric power system using phasor measurement unit (PMU) data (GPS-synchronized) and other SCADA data that are available in substations. In addition to typical voltage and current measurements, PMU data include frequency and rate of change of frequency. Such data are available in raw form, as time-stamped instantaneous...
In this paper, a new control strategy is proposed to manage the electrical power of a hybrid trigeneration system composed of a concentrated photovoltaic and thermal captator, an electrical storage group (including lead acid batteries and supercapacitors), a genset and a lithium bromide absorption machine. The architecture is based on a double DC-bus configuration. An improved control management of...
This paper presents a novel large-disturbance controller for power systems with significant induction motor (IM) load. Unlike the standard linearisation technique, a linearisation is used where the Cauchy remainder is included in the design process as a bounded uncertainty. Details of the process to obtain a bound on Cauchy remainder are given in the paper; the bound is used to design the robust minimax...
AUTOMATIC generation control (AGC) has been used for several years to meet the objective of maintaining the system frequency at nominal value and the net tie line power interchange from different areas at their scheduled values. One of the main components of AGC is Load frequency control (LFC), one of the major requirements in providing reliable and quality operation in multi-area power systems. In...
In this paper, a novel direct-drive wind generation system based on three-phase Z-source inverter is presented. Mathematical model of three-phase Z-source inverter is proposed by combining the traditional PWM rectifier model and equivalent model of the z-network. How variational shoot-through duty ratio affect the system is analyzed. The control method of acquiring stable Z-network capacitor voltage...
A new approach to design LPV robust gain scheduling controllers for a variable pitch variable speed wind turbine drive system is presented. The time-varying nonlinear model of the wind turbine is translated into a linear parameter varying (LPV) system with convex polyhedron version via the LPV convex decomposition technique. State feedback controller satisfying Hinfin performance at every vertex of...
The problem of the linear optimal control (LOC) has been strongly involved with selecting the weighting matrices in the cost function. The cost function is parameterized by two matrices, Q and R that weight the state and control vectors, respectively. In fact, the challenge lies in how these weights are chosen. This paper introduces a method to design the elements of Q and R by using genetic algorithm...
Power system dynamic stability includes two problems: power angle stability and voltage stability. For the former, the best way is to install power system stabilizer (PSS) on the key generator groups, and for the latter, however, Flexible AC transmission systems (FACTS) devices such as static var compensator (SVC), static compensator (STATCOM) and so on are the popular methods. PSS can effectively...
Wide-area monitoring and control system complements the classical protection systems and overcomes their drawbacks. In such systems a dynamic view of power system, using synchronized measurements in short time intervals, smaller than 20 ms, is available. This new kind of system's information provides a novel preventive control action to prevent system's large disturbances. This paper proposes a new...
In this paper an overview of the angle based particle swarm optimization algorithm (thetas-PSO) followed by its application to optimal reactive power procurement is provided. Among the ancillary services is the reactive power control, which has an important role in efficient operation of the power systems. Implementing a commercial based structure for reactive power scheduling is the most attractive...
The state estimation tools which are currently deployed in power system control rooms are based on a quasi-steady-state assumption. As a result, the suite of operational tools that rely on state estimation results as inputs do not have dynamic information available and their accuracy is compromised. This paper presents an overview of the Kalman filtering process and then focuses on the implementation...
In this paper, the use of dynamic braking as a cost-effective measure for damping inter-area oscillations is considered. Proposed control scheme assumes possibility of multiple insertions of dynamic braking resistor triggered whenever the speed of equivalent one-machine infinite bus (OMIB) system exceeds predefined value or controlled based on commanded electrical power calculated from OMIB transformation...
Design of a classical controller is based on output feedback and structure of the controller. From modern control point of view, the information of input signals, output signals and internal behavior of the system are presented in state space model. In this paper, modern control is used to increase small-disturbance stability of power systems. Although many of existing power plants prefer to use classical...
This paper presents a novel controller based on the delayed feedback control theory for stabilizing unstable torsional oscillations caused by Subsynchronous Resonance (SSR) in power systems. The first system of the IEEE Second Benchmark Model, which consists of a synchronous generator connected to an infinite busbar through two parallel transmission lines, one of which is equipped with a series capacitor,...
This paper presents a novel approach for designing of generator excitation controllers using Interconnection and Damping Assignment Passivity Based Control (IDA-PBC) technique for a Single Machine Infinite Bus (SMIB) system that can also be directly used in a multi-machine environment. The generator system equations are modified by referencing the rotor angle with respect to the secondary of the transformer...
Wide area measurement system (WAMS) has been widely used in power system dynamic monitoring and control, such as low frequency identification and control, stability analysis and control, etc. However, as a measurement tool, WAMS has the measurement error and bad data unavoidably. If the raw data is applied directly, the unpredictable consequence will be resulted in. Aiming at this problem, a novel...
In this paper, a nonlinear controller for the fifth order model of a synchronous generator is designed. The design procedure is based on Hinfin control theory and consists of two parts. First, the feedback linearization technique is used. Then, a linear robust controller is designed for the system. The controller has two blocks. One, is a nonlinear function of some local measurable signals such as...
FACTS devices have been shown to be powerful in damping power system oscillations caused by faults; however, in the multi machine control using FACTS, the control problem involves solving differential-algebraic equations of a power network which renders the available control schemes ineffective due to heuristic design and lack of know how to incorporate FACTS into the network. A method to generate...
In this paper, power networks are considered as hybrid non-linear dynamical systems for dealing with emergency voltage control. A hybrid approach based on a symbolic off-equilibrium linearized model and predictive control is presented and illustrated on a 9-bus power system case study.
Increasing additions of large-scale, non-traditional dispersed electricity generations such as those from wind farms on the traditional power systems have raised considerable concerns about the stability of power systems and adequacy of conventional stability controls. This paper presents an efficient adaptive stability control, based on step-ahead model prediction methodology, for a wide-area power...
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