Power Capacitors Essay

It is of great importance in our industries to cut the cost of power controlling with high efficiency and PWM satisfies this criteria. Therefore, it is

Increase in power output can be estimated by calculating the increase in the conversion efficiency when the cooling system is switched on. The increase in conversion efficiency is give the Table 2. We

As a leader in the rental vehicle industry for the past 30 years, ABC Rental Cars has continually remained a step ahead of its competition. To continue to set the pace for other rental agencies to follow, and to ensure ABC Rental Cars ' dominant position in the marketplace, alternative fuel vehicles (AFV), or more specifically, hybrid vehicles, should be evaluated as to the feasibility and consumer interest of introducing these types of vehicles into our fleet.

Grid source panel displays Voltage Vry, Vyb and Vbr and three phase current Ir, Iy and Ib on respective meters for both source A and source B. Also for source A sending end power factor is displayed on power factor meter. voltage selector switch is to be used to display Vry,Vyb and Vbr voltage. Power line Sensors: For source A voltage sensors for Vry, Vyb and Vbr, three current sensors for Ir,Iy and Ib and one 3P/3E/4W-trms power factor sensor is provided on sending end. also for source B three current sensors is provided on sending end.

BACKGROUND: The power system, built on century-old technology and approaches, was designed to deliver electricity from large, remote power plants across significant distances to the cities and towns where electricity is used. For that reason, there is great need for an effective Protection and Control of the System to complete the chain of Generation, Transmission and Distribution to the users.

Abstract— The purpose of this paper is to analyse the impact of three different Flexible Alternating Current Transmission System (FACTS) devices on a power system and to analyse their capabilities with respect to various disturbances. FACTS devices discussed in this paper are Static Var Compensator (SVC), Thyristor Controlled Series Capacitor (TCSC) and Unified Power Flow Controller (UPFC). The impact on power-flow and Power Oscillation Damping due to these devices is analysed in detail. Simulations based on different choices of Power Oscillation Damping (POD) signal are simulated for small and large disturbance incurred on the system. Effect of Linear (residue method) and Non-linear (CLF) based POD signals on the system is shown in the paper. Impact of each device is considered separately followed by a comparative study between them. All simulations are done with the help of SIMPOW© and all figures are plotted in MATLAB©.

Figs. 8(a-c) show the generated stator, rotor and total active powers respectively. Total active power is identical to the estimated power curve in Fig. 2. Fig. 9 shows the stator reactive power while the rotor reactive power is taken from the DC bus system. The RSC has large size with the lead power factor (Qs= -1.6 MVAR), otherwise, all lag power factors have smaller RSC size.

The LCL filter achieves the objective of smoothing of output current from the VSI. In an interconnected system, the implementation of the filter results in cost savings, reduction in overall weight and size of the components. Good performance can be achieved in the range of power levels up to hundreds of kW, with the use of small values of inductors and capacitors. The higher harmonic attenuation of the LCL filter allows the usage of lower switching frequencies to meet harmonic constraints

This paper deals with a four-leg distributed static compensator (DSTATCOM) which is used to solve the current related power quality. An amplitude adaptive notch filter (AANF) is employed for the reference current extraction of DSTATCOM control scheme because of its simplicity, capability of frequency and amplitude measuring, appropriate extraction of the fundamental signal, and insensitivity to the amplitude variation of the input signal. To generate the gate pulses of the switches, an adaptive hysteresis band current controller is used. In addition, fuzzy logic controllers are used for a better performance of DSTATCOM under dynamic conditions. The proposed control algorithm is robust to power disturbances, especially when the main voltage

DBR followed by a filter and an isolated zeta converter. The filter is designed to avoid any switching ripple in the DBR and thesupply system. An isolated zeta converter is designed to operate in DCM to act as an inherent power factor corrector. This combinationof DBR and PFC converter is used to feed a BLDC motor drive via a three-phase VSI as shown in Fig. 1. The dc link voltage of the VSI is controlled by varying the duty ratio of the PWM pulses of PFC converter switch. However, VSI is operated in a low frequency switching to achieve an electronic commutation of BLDC motor for reduced switching losses. A single voltage sensor is used at the front-end converter for the control of dc link voltage for speed control of BLDC motor. The proposed drive is designed and its performance is validated on a developed prototype for improved power quality at ac mains for a wide range of speed control and supply voltage variations.

Now a days, the measurement of power quality components and electrical protection are becoming more complex and costly also. As

ABSTRACT: -- In this a fuzzy logic control technique has been proposed for power quality improvement by using UPQC The UPQC is controlled to regulate the WF terminal voltage, and to mitigate voltage fluctuations at the point of common coupling (PCC), caused by system load changes and pulsating WF generated power, respectively. In order to reduce the voltage fluctuations that may cause “flicker”, and improve WF terminal voltage regulation, several solutions have been posed. The voltage regulation at WF terminal is conducted using the UPQC series converter, by voltage injection “in phase” with PCC voltage. On the other hand, the shunt converter is used to filter the WF generated power to prevent voltage fluctuations, requiring active and reactive power handling capability. The sharing of active power between converters is managed through the common DC link. A customized internal fuzzy logic control scheme of the UPQC device was developed to regulate the voltage in the WF terminals, and to mitigate voltage fluctuations at grid side. Simulation results show the effectiveness of the proposed compensation strategy for the enhancement of Power Quality.

The scope of this project is to Designed and constructs a prototype that can be used in powering any electrical appliance that required mains voltage from 220v to 240v. The project is limited to a 500VA power inverter, how it work, and its applications. The inverter will incorporate a battery charger an automatic change over that will enable auto back up within 1ms on the event or occurrence of power cut.

With the increasing loads, voltages and short-circuit duty in distribution system, over current protection has become more important today. The ability of protection system is demanded not only for economic reason but also consumers just expect ‘reliable’ service. In a Power System Protection, the system engineer would need a device that can monitor current, voltage, frequency, temperature and in some case over power in the system. Thus a device called Protective Relay is created to serve the purpose. The protective relay is most often relay coupled with Circuit Breaker such that it can isolate the abnormal condition in the system. In the interest of reliable

This project comes under the area of embedded system and the circuit comes under the IC based on the electromagnetic switch. In most of the projects, I have seen or observed that the loads are actually controlled by using a microcontroller block and also the loads managing techniques. To carry out this project, I had used multiple sources of information and spent more hours in the college laboratory.