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This paper presents a sliding mode controller for a wound rotor synchronous machine, acting as a generator for an isolated load. The standard dq-model of the machine is connected to a resistive load. A sliding surface is defined in order to fulfill control objectives, and the Ideal Sliding Dynamics is proved to be stable. From the desired surface, the standard sliding methodology is applied, and a...
In this paper, a nonlinear robust controller is proposed for the goal of power stabilization in power systems. The here-proposed approach is based on both the use of a properly-chosen sliding surface and the derivation of a disturbance attenuation condition (nonlinear L2-gain). The controller design is then applied to a single-machine-infinite-bus (SMIB) system and some simulation results demonstrate...
We are considering the problem of controlling wind turbine synchronous generators driven through AC/DC rectifiers and DC/AC inverters. The control objectives are threefold: (i) forcing the turbine speed to track a reference signal, (ii) regulating the DC Link voltage, (iii) enforcing power factor correction (PFC) with respect to the power network. First, a nonlinear model of the whole controlled system...
The global analytical modeling of a clamped plate equipped with piezoelectric sensor and actuator is developed. The vibrations of the plate are damped with a Linear Quadratic (LQ) control which exceeds the maximum voltage delivered by the piezoelectric actuator supplier, leading to a saturated imput. To deal with this problem of saturation, a sliding mode control is designed and the stability of the...
In this paper, a sliding mode implementation of a Proportional Integral Derivative PID controller is proposed. The objective of the controller designed is to control a DC-DC buck converter to track a desired set point voltage. The complexity of this controller arises from the fact that the only information available to the controller is the measured error. The buck converter inductance and capacitance...
The paper considers the problems of designing self-tuning output voltage regulators for standalone wind power plants equipped with asynchronized synchronous generators. Variations in wind speed and load (such as connection and disconnection of electric customers) result in variable output voltage and frequency of a windmill. Using an asynchronized synchronous generator allows one to fairly easily...
In this paper the problems of modeling, simulation and control of marine electrical network systems is addressed. The first goal is to model electrical embedded networks, in a simple but realistic way. A complete model for a one machine network is described. Loads are categorized according to their behavior. The essential problem of keeping output voltage constant during abrupt load commutations is...
In this paper a very high gain step up DC-DC converter is proposed. Maximum voltage gain in conventional boost converter like, switched inductor converter, switched capacitor converter, cascaded boost converter etc. are limited due to extreme duty cycle (i.e. duty cycle near to unity). Operation at extreme duty cycle leads to, serious reverse recovery problem at the switches, high conduction losses,...
A surge of needs for the low carbon society promotes a spread of electric vehicle (EV). EVs could be charged at night simultaneously, as a result, severe voltage drop may happen. The authors have proposed the method which can compensate the voltage drop caused by EV charging by means of adjusting charging schedules and controlling reactive power. However, though the method can avoid the voltage violation,...
This paper succeeds in solving the optimal reactive power dispatch (ORPD) of power system where the units contains wind turbines. Two types of wind turbine are taken into account in the ORPD, and they are the variable speed wind turbine (VSWT) and the fixed speed wind turbine (FSWT). Besides, the primal dual interior point method is introduced to serve as the algorithm to solve ORPD, since it performs...
With the development of interconnected power grids, the reactive coupling among areas is growing stronger, and the regional voltage control coordination problem is getting more serious as well. To solve this problem, a multi-area coordinated voltage control method is proposed in this paper, by introducing dynamic games to voltage control. A multi-area coordinated voltage control model based on dynamic...
Solid state transformers (SSTs) have found widespread power applications in traction locomotives, distribution systems, smart grids, etc., where they are going to replace conventional transformers and associated power enhancement equipments to provide better power quality features and functionalities. An eminent structure of SST comprises of three power conversion stages: input (AC-DC), isolation...
A detailed small signal analysis and a closed loop control design of naturally commutated current-fed dual active bridge (CFDAB) dc/dc converter are presented. Proposed converter is suitable for fuel cell vehicle between traction inverter and batteries. State-space averaging technique is used to derive the small signal model. A closed two-loop controller is designed and implemented on mixed signal...
In this paper ac/dc microgrid is implemented consisting of ac/dc loads and sources, operated in the grid connected mode and isolated mode. Multiple conversions like ac/dc, dc/ac can be reduced by ac/dc microgrid. Restructure of power system, increase in power demand and environment concerns are causing a focus on the distributed generation system with renewable energy. Photovoltaic system and wind...
The low and medium voltage renewable energy based dc distribution systems are catching increased attention world-wide due to their inherent benefits over ac systems. Higher efficiency, simple control, more suitable for integration of the sources producing dc power, are some of the main benefits of the dc systems. However, these systems are prone to serious stability issues caused by the constant power...
Dynamic Voltage Restorer (DVR) injects a compensated voltage to mitigate undesirable impacts on critical loads due to voltage sag/swell. In this work the controllers for DVR is proposed in stationary reference frame and injects a voltage which is in phase with the positive sequence of grid voltage. The method for load reference generation for stationary reference frame control is highly determinantal...
This paper proposes a modular isolated dc-dc converter, based on the input-series and output-series (ISOS) association of the full-bridge PWM (FB-PWM) dc-dc converter with capacitive filter. The main attribute of the proposed architecture is its ability to provide self-balance of the input and output voltage across the individual converters, without voltage loop control scheme, both in the steady...
This paper presents a comparison analysis among some methodologies in which aims to solve the selection of pilot buses for Secondary Voltage Control. For this purpose, a brief review of methodologies for both identifying voltage control areas and pilot buses selection are described. The validation of the results is done through the standard deviation applied to the variation of the voltage magnitude...
In recent years the availability of petroleum resources has decreased, which has paved the way for Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs). In order to achieve a better drive range and improved performance of the motor, control techniques are necessary for the DC to DC power converters which are used in these vehicles. Designing of linear controllers for these converters like Proportional...
This paper presents a proportional-integral (PI) Fuzzy rule based controller using Matlab for speed control of a dc motor. Also an analysis and performance evaluation of the proposed controller design has been carried out and presented in this paper. The fuzzy logic controller is designed using Fuzzy logic toolbox in Matlab, A mathematical model based on fundamental equations governing the operation...
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