Variable Speed Control Techniques For Single Phase Ac Motor Essay

Wise Electric Control Inc. is a full-service electrical contracting company that is located in Cherryville, North Carolina. Wise Electric Control Inc. is serving the residential, commercial, and industrial communities. Wise Electric Control Inc. is an expert in generators. Their residential services include new construction, remodeling, home additions, security lighting, hot water heater repairs, telephone and cable TV, etc. Wise Electric Control Inc. also conducts residential services such as safety inspections, service changes, trenching - line locating, ceiling fan installation, heating and AC wiring, additional receptacles, plus more. This exceptional electrical contracting company is a proud partner of the Mister Sparky- America’s On-Time

Single loop control methods allowed a single voltage control loop to regulate the output voltage. The input current shaping is accomplished in an open loop manner, the duty cycle patterns are predefined by considering in ideal PFC operation. One example in this control method is the duty phase control (DPC) proposed by Chen [42]. In this method, a phase shift is willingly introduced to the stored duty cycle patterns. The output voltage is regulated by adjusting this phase shift by using the output of the voltage error amplifier, which is named “the duty phase”. This approach simplified the control structure and eliminated the current loop, without the need to

Speed Control: the main disadvantage of AC motors, is that their speed is difficult to control. AC motors can be operated with variable frequency drives that provides smooth turning torque, at low speeds and get control over the speed of the motor up to its suggested value. Variable frequency drives enhance speed control, but create losses with low power quality.

Power electronic converters, especially DC/AC inverters have been extending their range of use in industrial application because they provide better system efficiency, reduced energy consumption and improved quality of power. The output voltage of inverter could be fixed or variable at a fixed or variable frequency and output waveforms are therefore made up of discrete values, producing fast transition rather than smooth ones [2]. The ability to

As industries expand, utilities become more interconnected and the use of electricity rises, power quality becomes essential to insure a smooth industrial process. The main problem that severely affects the power’s quality is the presence of the harmonics, which affects the performance of the system. Some of the problem caused by the harmonics are metal parts’ overheating, increasing noises in motors, decreasing the efficiency of the motors, etc. some corrective methods can be used to reduce its effect.

CHAPTER 1: CHAPTER 2: CHAPTER 3: CHAPTER 4: CHAPTER 5: CHAPTER 6: CHAPTER 7: CHAPTER 8: CHAPTER 9: CHAPTER 10:

There are numerous methods which are as follows like (SPWM) First Sinusoidal Pulse Width Modulation, (MCPWM)Second, Multi-Carrier Pulse Width Modulation and (SHE-PWM) and Selective Harmonic Elimination Pulse Width Modulation which are implemented for harmonic elimination specially in multilevel inverter. (MCPWM)Multi-Carrier Pulse Width Modulation strategies are widely used, because they can be easily implemented to low voltage modules. Normally MCPWM can be classified and categorized as Level Shifted PWM (LS-PWM) and Phase Shifted PWM (PS-PWM) methods. (LS-PWM) Level Shifted PWM are characterized into three which are Firstly ,Phase Disposition Technique (PD), secondly ,Phase Opposition Disposition Technique (POD) thirdly Alternative Phase Opposition Disposition Technique (APOD) [45] [46] [47].

The development of power electronic converters is marked by demands for a simultaneous reduction in Size , losses and power related costs. Historically diode bridge rectifiers with a laSrge capacitor at the dc bus have been used to convert the ac voltage to a dc voltage. But diode bridge rectifiers draw a very high peak current from the ac utility, which is rich in harmonics and thus gives a very poor power factor. Modern AC-DC power supplies utilize power factor correction in order to minimize the harmonics in the input current drawn fiom the utility. The Boost topology is the most popular topology used for power factor correction today. In this paper, power factor correction using boost converters in single phase diode bridge rectifiers is presented.

The thesis suggests an LCL filter for suppression of harmonics and for improving performance for feedback control. The inverter side inductor and grid side inverter are set at a value of 1 mH. The inverter and grid inductor resistance and damping resistor inductance values are set to zero. The capacitor is operated at a value of 0.2 μF.

Over the years, variant strategies have been proposed in the literature for the control of the three-phase voltage (AFE) rectifier. All these strategies aim to achieve the same objectives, namely: a high power factor (close to one) and a quasi-sinusoidal waveform of the currents absorbed. They are differentiated by the nature of the servo loop used. The latter may be either current or power. For this purpose, two classes can be distinguished: VOC (Voltage Oriented Control): using a current loop, developed by analogy with the vector control of electrical machines. It consists in orienting the current vector in the same direction as that of the voltage vector [8], DPC (Direct Power Control): developed by analogy with the direct torque control (DTC) of induction motors. It is to control the instantaneous power, active and reactive, instead of the torque and flux through two inner loops [9].

Power electronic converters, especially DC/AC inverters have been extending their range of use in industrial application because they provide better system efficiency, reduced energy consumption and improved quality of power. The output voltage of inverter could be fixed or variable at a fixed or variable frequency and output waveforms are therefore made up of discrete values, producing fast transition

Abstract: Load frequency control problem is considered as one of the most important issues in the design & operation of power systems. Due to lack of good efficiency in parameters variation conditions, working conditions of system and non-linear factors, a simple PI controller is not suitable in industrial applications. Instead, fuzzy controllers can be used in order to enhance the performances of the systems. In this paper, the use of the optimized type-1 fuzzy logic controller using Particle Swarm Optimization (PSO) algorithm is proposed to solve the load frequency control problem. To the best of our knowledge, the PSO optimization of fuzzy type-1 controller in order to solve load-frequency control problem, has not been investigated so far. The proposed controller has good performance and is capable to solve the load-frequency control problem in conditions of wide variations of system parameters and nonlinear factors such as generation rate constraint. Simulation results show that the optimized fuzzy controller proposed in this paper exhibits better performance compared to PI controller in damping of system deviations.

This impedance inverter is applying to control speed of an induction motor. In CSI and VSI techniques which Produces undesirable harmonics. This harmonic results in reduction in efficiency of induction motor speed control. By using this inverter the harmonics are reduced which helps in giving better variable speed for speed control of induction motor. In this impedance inverter consists of two inductors and two capacitors which acts as filter that reduces harmonics And it can also be effectively reduce the voltage stress across the capacitors in the impedance network. This reduces the voltage range of the capacitors used, and also the cost of the proposed Method.

Abstract: The brushless DC motor also called the electronically commutated motor (ECM) drive are synchronous motors that are powered by a DC electric source through an integrated inverter/ switching power supply, which produces an AC electric signal to drive the motor. They make operations more reliable, efficient and less noisy. In terms of weight, they are lighter than the brushless DC motors with the same power output. It has helped a great deal in solving the challenges encountered with the brushed DC motors which wear out

Abstract: - SEDC motors are used extensively in industrial variable speed applications because of most demanding speed-torque characteristics and are simple in controlling aspects. This paper presents an implementation of internal model control (IMC) for speed control of separately excited SEDC motor based on LabVIEW. A mathematical model of the process has been developed using real plant data and then conventional controller has been designed. A comparative analysis of performance evaluation of controller has been done.