Enhancement Of Pq For Nonlinear Loads By Sapf And Facts Device Essay

In the industrial sector the various motoring loads are continuously running and generating the inductive load. So the power factor in this system gets reduced due to the inductive reactive power. But the electricity board has a standard limits regarding the power factor values and if the power factor goes below the specified limit; the electricity company charges the penalty to the industrial consumers. The automatic power factor correction panel provides the required compensation to overcome the inductive reactance by using the power capacitors. The microcontroller PIC receives current signal from current transformer and simultaneously gives the signals to the various contactors to connect the capacitors in the line for the compensation. Thus by adding the capacitor to the line will compensate the reactive power and maintains the power factor near to unity. This will avoids the penalty to the industrial consumers and may get the incentives. In the conventional methods we were using the fixed capacitor for compensation. But these were leading to excessive charging of the capacitors causes the voltage surges. Thus it becomes difficult to main power factor near unity by on and off operation of fixed capacitor. The contactor switched capacitors are connected and disconnected automatically eliminating the previous problem.

Alexander B. Nassif and Jing Yong [7] have proposed a method to identify the consumers generating inter harmonic frequencies. The inter-harmonics can be measured by means of Impedance based approach applied at the metering point. The main idea is that, the inter-harmonic impedance of the system is much smaller than that of an inter-harmonic generating load. This method can identify the source of each inter-harmonic component without having to rely solely on the active power measurement and requires only an approximate value for the inter-harmonic impedance measured at the metering point.

This section investigates the performance of the proposed control algorithm of DSTATCOM by means of computer simulations in MATLAB/Simulink environment. Tracking and harmonic decomposition capability of the proposed AANF are evaluated in this section, and the performance of the whole system for load balancing, the harmonic compensation, the neutral current compensation, and the power factor correction will be investigated in Section 5.

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.

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©.

Keywords: CUK Bridgeless Topology, Fuzzy Logic Controller (FLC), Power Factor Correction (PFC), Proportional- Integral (PI) Controller.

So harmonics directly effect the system performance. For performance improvement of an inverter it is desirable to eliminate harmonics. IEEE 519 Standard gives maximum allowable limits for voltage and current distortions [3].

Wind power plant induction generator is viewed as a consumer of reactive power. Its reactive power consumption depends on active power production. Conventionally, shunt capacitor banks are connected at the generator terminals to compensate its reactive power consumption. In some schemes, shunt capacitor banks could be automatically switched on/off by using feedback signal from generator reactive power. The capacitor switching is triggered through an algorithm if a generator reactive power is outside an allowed dead-band for a specified time period. Further on, continuous voltage control and reactive power compensation at the point of the WECS network connection is provided by using FACTS-based device. Among FACTS devices, the Unified Power Flow Controller (UPFC) is chosen due to its versatile regulating capabilities. The UPFC consists of shunt and series branches, which could be interchangeably used. Being located at the point of the WECS connection to the distribution network, it is made possible to simultaneously control the WECS bus voltage magnitude and/or series reactive power flow that WECS exchanges with the network. This countermeasure is expected to contribute in making assessed wind site viable for connecting larger number of wind turbines.

The term ”FACTS” (Flexible AC Transmission Systems) covers several power electronics based systems used for AC power transmission and distribution. The most interesting for transmission

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 increase of electronic equipments has caused the increase in the nonlinear loads and due to these loads power quality is being deteriorated. The supply voltage is distorted due to harmonic currents drawn from the supply by nonlinear loads. Distorted currents and voltage cause the user’s equipment to not work properly, conductors will overheat and may decrease the efficiency and life of the equipment. Usually a passive LC power filter is employed to wipe out the current harmonics

For emolument of current harmonics (if any), the instantaneous resoluteness of different active and reactive powers is utilized - the active and reactive powers are computed utilizing p-q theory. No restrictions are imposed on the voltage or current wave forms, and it can be applied to three-phase systems with or without a neutral wire for three-phase generic voltage and current wave forms. Thus, it is valid not only in steady state, but withal in transient states.

Index Terms – Unified Power Quality Conditioner, Active Power Filter, hysteresis control, voltage and current unbalance.

Neha Kundariya, Jyoti Ohri in their research paper titled ‘Design of Intelligent PID Controller using Particle Swarm Optimization with different Performance Indices’ proposed a PSO based PID controller for controlling of DC shunt motor using different performance indices like Integral of Time multiplied by Absolute Error (ITAE), Integral of Absolute magnitude of Error (IAE) and Integral of Square of Error (ISE). From the results obtained, it was found that integral time of absolute error(IAE) gives better results in time domain compared to other performance indices PID control

Student: Vishal Kasotia Project Guide: Mr Ajay Sharma. College: Indian Institute of Technology Roorkee Course: Electrical Engineering with Specialization in Power Electronics (EPE) Enrolment Number: 12212014 Internship Period: May 11, 2015 – July 3, 2015