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This paper presents a comprehensive simulation model of a five-phase induction motor drive system. Both open-loop and closed-loop control is elaborated. The complete component modeling is developed using `simpower system' blocksets of Matlab/Simulink. To address the real time implementation issues, dead banding of the inverter switches are also incorporated in the simulation model. To validate the...
In electrical network, control of output voltage and frequency are vital issue. In this article, it introduces the modeling and simulation of synchronous alternator in MATLAB and the linearization of it. The model of system is decomposed into electrical part and mechanical part according to the requirement of Linear Quadratic Regulator. The whole system is simulated using S-function. In the end, using...
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...
The power demand is more than the generation and it is not economical & reliable to increase the generation by conventional sources. Day by day the use of non-conventional sources has been increased due to their economy and pollution free characteristics. This paper deals with the synchronization and stability of non-conventional source like Pico and micro hydro plant with thermal based synchronous...
The last three decades have experienced an impressive growth in loads interfacing with the grid through power electronic devices. These include personal computers and most office equipment as well as industrial induction motors driven by variable frequency drives. The increasing importance of these non-conventional loads has an impact which is yet to be quantified and modeled systematically. This...
This paper deals with the voltage and frequency control of an autonomous induction generator (IG). In order to do that, a voltage source inverter (VSI) with a dump load (DL) circuit on its DC side is employed. The IG frequency is controlled by keeping constant the VSI synchronous frequency. For the IG voltage regulation two cascaded regulators are used, which have as reference the line voltage and...
This paper introduces a new fast speed regulation control strategy for HVF (high voltage frequency-converters) to facilitate the squirrel cage AC-motor reacting possibly fastest to the speed commands without over-current and instability. The basic principal is to regulate the frequency to follow the target currents which again follow the desired torques determined by the mechanical character of the...
The application of a doubly fed induction generator (DFIG) as a suitable generating scheme in a remote or isolated communities is presented in this paper. Remote area power supply (RAPS) system, a dummy load and its controller with energy storage system (ESS) are identified as the key components. The dummy load is used to absorb the power associated with over generation. The battery storage system...
The peak-current control that is modeled in this paper is a novel variable-frequency control that maintains regulation in a flyback converter by enabling and disabling cycles instead of modulating the pulse width, which allows for elimination of feedback compensation and can provide for peak power three times higher than the rated full-load power without increasing the power supply component sizes...
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...
Self Excited squirrel cage Induction Generator (SEIG), is used widely to convert mechanical wind energy to electricity, due to their low cost, small size, no need of separate dc source and brushes. This paper proposes a new reduced order model for small wind energy system consisting of: Squirrel Cage Induction with excitation capacitors, D-Statcom, loads and mechanical parameters. Comparing with conventional...
This paper deals with a voltage and frequency control of an isolated asynchronous generator feeding 3-phase 4-wire loads in constant power applications where terminal voltage, excitation capacitor, speed and generated power of the generator remain constant under all operating conditions. The proposed controller functions as an improved electronic load controller (IELC) to regulate the frequency and...
This paper deals with the voltage and frequency control of an autonomous induction generator (IG). In order to do that, a voltage source inverter (VSI) with a dump load (DL) circuit on its DC side is employed. The IG frequency is controlled by keeping constant the VSI synchronous frequency. For the IG voltage regulation two cascaded regulators are used, which have as reference the line voltage and...
Variable frequency drives (VFD) are subject to various types of disturbances especially cyclical ones. These periodic disturbances are difficult to compensate by conventional controllers. Repetitive control can only compensate for constant frequency fluctuations. PWM inverter based VFDs are subject to periodic disturbances with variable frequency. In this paper, a new angle domain based iterative...
This paper presents an efficient method to supply single-phase loads with a three-phase induction generator (IG). A combination between a properly controlled voltage source inverter (VSI) and dump load (DL) ensures, besides the phase balancing of the IG, the voltage and frequency regulation. The VSI operates at constant frequency - thus keeping the system frequency also constant - and deals with unbalances...
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