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POWER FACTOR CORRECTION

Published by Lawrence Cunningham Modified over 5 years ago

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Presentation on theme: "POWER FACTOR CORRECTION"— Presentation transcript:

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Presentation on Power Factor Correction using PIC & Overview of Television Station

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Sakshi Pawar

Due to the modern civilization the growth of industry has been increased as thus the usage of energy has been raised. So ,every industry needs to implement power factor correction to limit power wastage and to avoid penalty due to the same. Lower power factor means that higher current is flowing through it, Higher current results in greater voltage drop. There are many methods to solve this problem so the aim of our project is to correct the power factor of a single phase electricity by switching capacitor. The utility that delivers the power to you will likely charge you if your power factor is to low.GSM module is used to alert the user about the power factor of loads and give the error indication in the system.

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Oscar Garcia

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Journal of Central South University of Technology

Richard Dzudzor

An intelligent power factor correction scheme is presented for three phase low power factor loads. This new scheme is able to perform individual phase sensing of parameters by monitoring at all times to sense a change in system parameters and affects individual phase correction by applying the exact amount of reactive components needed for each phase, and can also reduce negative sequence current caused by the load to improve system balance. An optimization criterion is used for the proper calculation of reactive power steps in a power compensation installation of capacitor banks. The criterion is enabled by sampling measurements performed on the electrical plant examined within specific interval of time.

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Rapid increase of consumers in electronics devices and the use of mains rectification circuits inside these electronic devices is the root cause of mains harmonic distortion. Automatic power factor correction techniques can be applied to the industries, power systems and households to make them stable inturns increases the efficiency of system as well as the apparatus. This paper deals with the hardware design of active power factor correction circuit employing boost converter which is used to boost the DC voltages with a controller based on PID control strategy. The pulses given to power switches by pulse width modulation techniques generated by utilizing micro-controller board, Arduino thus obviating the need of complex hardware circuitry. MATLAB/SIMULINK was used to design and tune the PID controller parameters. The simulation results are matching with the predictions and the same was implemented as hardware. The waveforms various test points and across capacitors were obtained, ...

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— This report addresses the Impact of Power Factor Correction Device on Residential Household Electrical System. The usage of power factor correction is an efficient way to improve power consumption and using power factor correction method to improve the power factor in a house to achieve near to unity which can avoid the consumer from experiencing power loss in the electrical appliances and also more efficient energy supplied to their electrical appliances.

— In recent years, the power quality of the AC system has become a huge desolation due to the rapidly increased numbers of inductive loads, electronic equipment, power electronics and high voltage power system. In order to reduce line losses and improve the transmission efficiency; power factor correction research has become a hot topic. Our paper gives new approach towards the solution of this problem.

INTERNATIONAL JOURNAL OF ENGINEERING TECHNOLOGIES AND MANAGEMENT RESEARCH I J E T M R JOURNAL , Ararso Taye

In the present technological revolution power is very precious. So we need to find out the causes of power loss and improve the power system. Due to industrialization the use of inductive load increases and hence power system losses its efficiency. So we need to improve the power factor with a suitable method of automatic power factor correction. This study undertakes the design and simulation of an automatic power factor correction that is developed using arduino microcontroller ATmega328 Automatic power factor correction device reads power factor from line voltage and line current. This time values are then calibrated as phase angle and corresponding power factor. The display used was 4X16 liquid crystal display module. The motherboard calculates the compensation requirement and accordingly switches on different capacitor banks will run. This automatic power factor correction technique can be applied to the industries, power systems and also households to make them stable and due to that the system becomes stable and efficiency of the system as well as the apparatus increases. The use of microcontroller reduces the costs and the customers become beneficial according to the simulated output because the power factor of the specific selected industry is corrected from 0.66 to 0.92 improved value.

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ENERGY EFFICIENCY & POWER FACTOR CORRECTION - PowerPoint PPT Presentation

ENERGY EFFICIENCY & POWER FACTOR CORRECTION

With energy prices at the highest levels on record, and projections for a steady increase of almost 4% a year for the next 20 years. the average power bill will cost your company over $115,000 in additional energy expenses, just for using the same amount of energy you use today. – powerpoint ppt presentation.

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Power Factor and Power Factor Correction

Sep 26, 2014

490 likes | 1.1k Views

Power Factor and Power Factor Correction. Learning Objectives. Define power factor. Define unity, leading and lagging power factors. Define power factor correction and unity power factor correction.

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• power factor
• apparent power
• unity power factor
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Presentation Transcript

Learning Objectives • Define power factor. • Define unity, leading and lagging power factors. • Define power factor correction and unity power factor correction. • Calculate the inductor or capacitor value required to correct AC series parallel networks to the desired apparent power. • Compare currents, voltages, and power in AC series parallel networks before and after power factor correction.

Review AC Power to a Resistive LoadAC Power to a Inductive LoadAC Power to a Capacitive Load

Review Apparent Power • For a load with voltage V and current I, the power that “appears to flow” to the load is VI where V and I are rms values. S = VI (VA) • S is called the apparent power and has units of volt-amperes (VA).

Review Real and Reactive Power • The power triangle also shows that we can find real (P) and reactive (Q) power.

Power Factor • Power factor (FP) tells us what portion of the apparent power (S) is actually realpower (P). • Power factor is a ratio given by FP = P / S • Power factor is expressed as a number between 0 to 1.0 (or as a percent from 0% to 100%)

Power Factor • From the power triangle it can be seen that FP = P / S = cos  • Power factor angle is thus given  = cos-1(P / S) • For a pure resistance,  = 0º • For a pure inductance,  = 90º • For a pure capacitance,  = -90º NOTE: Ө is the phase angle of ZT, not the current or voltage.

Example Problem 1 Determine the power factor for this circuit. Is it inductive or capacitive?

Example Problem 2 For the circuit below, determine PT, QT, ST, FP and draw the power triangle. If E is 120VRMS, determine the supply current IRMS.

Unity power factor (FP = 1) • Implies that all of a load’s apparent power is real power (S = P). • If FP = 1, then  = 0º. • It could also be said that the load looks purely resistive. • Load current and voltage are in phase.

Lagging power factor ( > 0º) • The load current lags load voltage • Implies that the load looks inductive.

Leading power factor ( < 0º) • The load current leads load voltage • Implies that the load looks capacitive.

Why is Power Factor Important? • Consider the following example: A generator is rated at 600 V and supplies one of two possible loads.Load 1: P = 120 kW, FP = 1Load 2: P = 120 kW, FP = 0.6 • How much current (I) is the generator required to supply in each case?

Why is Power Factor Important? • For the load with Fp= 0.6, the generator had to supply 133 more amperes in order to do the same work (P)! • Larger current means larger equipment (wires, transformers, generators) which cost more. • Larger current also means larger transmission losses (think I2R).

Why is Power Factor Important? • Because of the wide variation in possible current requirements due to power factor, most large electrical equipment is rated using apparent power (S) in volt-amperes (VA) instead of real power (P) in watts (W). • Is it possible to change the power factor of the load?

Power Factor Correction • In order to cancel the reactive component of power, we must add reactance of the opposite type. This is called power factor correction.

Power Factor Correction • In practice, almost all loads (commercial, industrial and residential) look inductive (due to motors, fluorescent lamp ballasts, etc.). • Hence, almost all power factor correction consists of adding capacitance.

Example Problem 3 The 600 V, 120 KVA generator is connected to a load with P = 120 kW and QL = 160 kVAR. • Determine the power factor of the load. • Determine the size (in VAR) of capacitive load (QC) required to correct the power factor to unity.

Power Factor Correction • Transmission lines and generators must be sized to handle the larger current requirements of an unbalanced load. • Industrial customers are frequently fined by the utility if their power factor deviates from the prescribed value established by the utility.

Example Problem 4 Determine S, PT, QT, and FP. Determine the value of the capacitance (in F) required to bring the power factor up to unity (freq of 60 Hz). Determine generator current before and after correction.

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Power Factor. The power factor (i-e.cos fi ) of a circuit can be defined in one of the following ways: Power factor= Cos fi = ciosine of angle b/w V &amp; I Power factor = R / Z = Resistance / Impedance Power Factor = VI cos fi / VI = True power / Apparent power

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