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In this paper a new SPWM technique using a trapezoidal triangular multicarrier for a 17 level cascaded H bridge multilevel inverter is simulated and compared with other types of carrier based PWM technique for performance evaluation. Different triangular carrier modulation techniques such as constant switching frequency level shift (LS) PWM technique viz, phase disposition (PD), phase opposition disposition...
In isolated and remote area researchers are motivated recently to generate power using wind. Self excited induction generator (SEIG) is selected as a good candidate to extract electric power from wind. In this paper transient performance of SEIG during short circuit fault has been studied. Though SEIG is capable to protect itself from faults, but it is also necessary convey the message to operator...
In this paper various multicarrier PWM schemes are simulated, to reduce the THD and enhance the output voltage waveforms for seventeen level inverter. Here, three modulation techniques are compared: constant switching frequency (CSF), Phase shift (PS PWM) and variable switching frequency (VSF). These schemes are applied for analysis of both symmetrical and asymmetrical structure of cascaded H-bridge...
Recently micro grids are attracting attention of researchers due to the fact that they can serve as the best solution for the most alarming problems in power generation and distribution industry. Micro grids are capable of generating clean energy and supplying good quality power. In this work, a simple micro grid system is modeled and analyzed which consists of two diesel generators and a DFIG based...
Self-excited induction generator (SEIG) is preferred in isolated and remote power generating systems. But the major problem associated with SEIG is change in voltage and frequency during loading condition. For the development of simple voltage and frequency controller it is essential to detect the load transient in less time using less hardware. In this paper Second Generation Wavelet Transform (SGWT)...
This paper derives the mathematical expression for the minimum excitation capacitance of self excited induction generator under different types of load and speed, and also studies the performance of a self-excited induction generator (SEIG) driven by a prime mover. Mathematical model of the isolated SEIG under balanced loading conditions in d-q stationary reference frame is developed to study the...
In this paper, the transient and steady state performance improvement of an indirect vector controlled cage induction generator is presented. Two different types of controllers, namely P-I and a hybrid of P-I and self tuned fuzzy controller are designed and simulated, for an application in wind turbine driven line connected induction generator. It is verified that the proposed hybrid controller improves...
In this paper, the transient and steady state performance improvement of an indirect vector controlled cage induction generator is presented. Two different types of controllers, namely P-I and a sliding mode controller are designed and simulated, for an application in wind turbine driven line connected induction generator. It is verified that the proposed sliding mode controller improves the performance...
This paper first presents systematic design of PI controllers for transient performance improvement of a field-oriented induction motor drive. Through extensive simulation, it is verified that P-I controller fails to give satisfactory response when load torque, stator resistance and rotor resistance change. Then, sliding mode speed and flux controller are designed to make the system robust to external...
This paper presents an application of a Takagi Sugeno (TS) Fuzzy logic based adaptive Iterative Learning Controller (ILC) to reduce chattering, torque ripple and to improve dynamic performance of a feedback linearized induction motor drive with sliding mode controller for periodic speed tracking. This ILC is connected to the forward path of sliding mode speed control loop. At first, the state feedback...
This paper proposes a simple three phase, three level IGBT based ac-dc neutral point clamped converter with a shunt passive filter, at the front end of a PWM VSI feeding induction motor drive, to compensate reactive power, reduce harmonics in source current and to regulate dc link voltage. Mathematical model is used to design the control scheme for the front-end converter. Passive shunt filter is...
The paper presents a sliding-mode speed control system for an indirect vector controlled induction motor drive for high performance. The analysis, design and simulation of the sliding-mode controller for indirect vector control induction motor are carried out. The proposed sliding-mode controller is compared with PI controller with no load and various load condition. The result demonstrates the robustness...
DFIG is the most common rotatory machine which is used on the grid connected wind energy conversion system for the fulfilment of the system requirement such as grid stability, fault ride through (FRT), power quality improvement, and grid synchronization and power control etc. Though the requirements are not fulfilled directly by the machine rather the control strategy is used in both the stator as...
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