Top PDF PSO Based Neutral Current Compensation in a Three Phase Distribution System Using Electric Springs

PSO Based Neutral Current Compensation in a Three Phase Distribution System Using Electric Springs

PSO Based Neutral Current Compensation in a Three Phase Distribution System Using Electric Springs

The widespread use of non-linear loads causes, significant amounts of harmonic currents are being injected into power systems. Passive power filters (PPF) are generally used as traditional way for harmonic suppression which has made up of basic components like power capacitor, power inductance and resistance. It cannot filter the non-characteristic harmonics. The active power filter works on the operating principle by detecting harmonic current to calculate the amount of the compensating current needed for feeding back to the power system inorder to cancel the harmonic current [11]. There are various
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Implementation of 3 Phase Electric Springs in Unbalanced Power Systems using Instantaneous Power Theory

Implementation of 3 Phase Electric Springs in Unbalanced Power Systems using Instantaneous Power Theory

line conditioners. The term "power conditioning" used in this book has much broader meaning than the term harmonic filtering." In other words, the power conditioning is not confined to harmonic filtering, but contains harmonic damping, harmonic isolation, harmonic termination, reactive-power control for power factor correction, power flow control, and voltage regulation, load balancing, voltage-flicker Suction, and/or their combinations. Active power line conditioners are based on leading-edge power electronics technology that includes power conversion circuits, power semiconductor devices, analog/digital signal processing, voltage/current sensors, and control theory. Concepts and evolution of electric power theory are briefly described below. Then, the need for a consistent set of power definitions is emphasized to deal with electric systems under non-sinusoidal conditions. Problems with harmonic pollution in alternating current systems (ac systems) are classified, including a list of the principal harmonic-producing loads. Basic principles of harmonic compensation are introduced. Finally, this chapter describes the fundaments of power flow control. All these topics are the subjects of scope, and will be discussed deeply in the following chapters of the book. The instantaneous power theory, or ―the p-q theory,‖ makes clear the physical meaning of what instantaneous real and imaginary power is in a three-phase circuit. Moreover, it provides insight into how energy flows from a source to a load, or circulates between phases, in a three- phase circuit. This theory can be used in the design and understanding of FACTS (Flexible AC Transmission System) compensators. The book introduces many concepts in the field of active filtering that are unique to this edition. It provides a study tool for final year undergraduate students, graduate students and engineers dealing i-th harmonic pollution problems, reactive power compensation or power quality in general. 2 EXISTING SYSTEM
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Research on Unbalanced Current Compensation Control Strategy Based on Neutral Point Clamp Converter

Research on Unbalanced Current Compensation Control Strategy Based on Neutral Point Clamp Converter

Abstract. The use of distributed generation systems has led to serious power quality problems in low-voltage distribution networks. Low voltage distribuion network power quality needs to be valued. In this paper, a multi-function power converter (MPC) device with balanced three-phase asymmetrical current, reactive power compensation, power factor improvement and harmonic elimination is proposed. The paper introduces a MPC topology which has three-level inverter with a neutral point clamped (NPC) and a voltage balancer (VBC). A new control method combining the network current reference algorithm and PQ decoupling is given in this paper. Finally, the 100kW simulation system is built to verify the effectiveness of the proposed control strategy, which can effectively solve the power quality problems in the low voltage distribution network by using MPC. Some simulation and experimental results are illustrated to show the prototype device’s performance.
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Neutral Current and Neutral Voltage in Three Phase Four Wire Distribution System of a Technical Institution

Neutral Current and Neutral Voltage in Three Phase Four Wire Distribution System of a Technical Institution

The project is one such attempt to identify the level and type of the harmonic distortion in neutral voltage and neutral current waveform caused by certain typical loads which are both non-linear and sensitive to power quality. The paper also reflects the effect of varying power supply on neutral conductor, analysis of neutral current and neutral voltage and their distortion level due to various non-linear loads. Each and every data are analyzed thoroughly in this project. Several conclusions are given which will necessary for designing and installation of the exact mitigating device. It has done by doing a survey in the National Institute of Technology, Agartala to analyze the collected data and give the necessary information based on the analysis. Random sampling at different places of NITA has been carried out to stress the severity of the problem and out of it Electrical Machine laboratory has been taken the place of study for its criticalities.
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Mitigation of Neutral Current in a Three Phase System using Electric Springs

Mitigation of Neutral Current in a Three Phase System using Electric Springs

The power inverter needs to operate in a special manner for neutral current mitigation. Besides the power inverter, a feasible three-phase ES system includes a PLL (Phase Locked Loop) block, single-phase d-q transformation block and a Particle Swarm Optimization (PSO) based controller.In order to acquire accurate feedback, all variables in three- phase ES system should be synchronized under a fixed fundamental frequency. This is realized by the installation of a PLL block which generates the fundamental system frequency and provides a reference vector with 0° phase angle. The line voltage V sA is used as the reference vector. The single phase d-q transformation block decouples each current and
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A Novel SAPF for Reduction of Harmonics & Reactive Power with FLC Fed Five-level Cascaded Inverter

A Novel SAPF for Reduction of Harmonics & Reactive Power with FLC Fed Five-level Cascaded Inverter

Abstract: The optimization of shunt active power filter parameters based on fuzzy logic control is presented. The current active filter control is based on constant, fuzzy hysteresis band techniques, which are employed to derive the switching signals. The main duty of a shunt APF is to inject into the system a compensating current (active filter current) so as to make the source current sinusoidal and in phase with the source voltage. Pulse Width Modulation (PWM) inverter (with 10 kHz of high switching frequency) has been used for harmonic and reactive power compensation. However, the high initial and running cost have been hindering their practical use in power distribution systems. In addition it is difficult for PWM-inverter based active filters to comply with electromagnetic interference (EMI) requirements. A cascaded multilevel inverter has been proposed for both harmonics and reactive power compensation. This inverter generates almost sinusoidal staircase voltage with only one time switching per line cycle. When cascaded inverter is applied to line conditioning and active power filtering of a distribution system, it is expected that the initial and running costs and the EMI will be dramatically reduced below that of the traditional PWM inverter. This paper presents a compensating system for the harmonic currents, the reactive power and source neutral conductor current in three-phase four-wire distribution system by using a five-level cascaded H-bridge voltage source inverter (CHB-VSI) based shunt active power filter (SAPF). The proposed concept is verified by using Matlab/Simulink software and the corresponding results are presented.
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A Novel Method of Phase Current Compensation for Switched Reluctance Motor System Based on Finite Element

A Novel Method of Phase Current Compensation for Switched Reluctance Motor System Based on Finite Element

Torque ripple of SRM has been the main issue in the application of this motor, especially at low speed, the torque ripple is very serious, and it will cause undesirable vibration and acoustic noise. There are many factors to affect the torque ripple, such as rotor and/or stator shape, air length, commutation strategy, control strategy and so on, but the most important factor is phase current, which can be described by the static torque characteristics, as Fig. 8 shows. The torque ripple of SRM at low speed is described in Figure 5. Because of the saliency of the stator and rotor, the torque ripple is produced when the former phase is being excited opposite voltage and the latter phase is over excited (as Fig. 12 shows). Seen from the Figure 5, the ripples produced by the four excited phases of SRM are very large, and the point of intersection between the two excited phases must be advanced to a higher value for reducing the torque ripple.
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ILST Control Algorithm Based Solar Photovoltaic System Using MPPT for Three Phase AC Distribution

ILST Control Algorithm Based Solar Photovoltaic System Using MPPT for Three Phase AC Distribution

The SPV conversion process consists of PV cells, high step-up boost converter, three phase inverter, MPPT circuit and ILST algorithm, and a ripple filter. A PV string consists of series parallel combination of small photovoltaic modules to match the required power rating. The SPV energy conversion system is interfaced to a three-phase distribution system. Connected loads may be linear or nonlinear in nature which may be compensated by VSC of SPV system. A floating dc link structure is used unlike two stage topology with fixed dc link voltage. The VSC performs the functions of MPPT, harmonics elimination, balancing of grid currents, and power factor correction at the same time with the proper control. The interfacing inductors and ripple filter are used to filter switching harmonics. Therefore MPPT techniques are needed to maintain the PV array’s operating at its MPP [comparison]. Many MPPT techniques have been proposed in the literature; example are the Perturb and Observe (P&O) methods, Incremental Conductance (IC) methods , Fuzzy Logic Method In this paper two most popular of MPPT technique (Perturb and Observe (P&O) methods and Incremental Conductance methods).
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Suppression of Harmonics and Neutral-Line Current by Hybrid Power Conditioner in Three-Phase Four-Wire Distribution Power Systems

Suppression of Harmonics and Neutral-Line Current by Hybrid Power Conditioner in Three-Phase Four-Wire Distribution Power Systems

and a single-phase power converter connected in series, is connected to the load in parallel to suppress the neutral- line current. The neutral line of the load is directly connected to that of the utility, and the fluctuation in ground voltage of the load can thus be avoided. A series of active power filters connected to the neutral line between the utility and the load can suppress the neutral-line current, thus eliminating the need of the transformer for a zero current path. However, there is fluctuation in ground voltage of the load because the neutral lines of the load and utility are separated. Conventionally, passive power filters have been employed to solve the problems of harmonic currents and neutral-line current in three-phase four-wire distribution power systems. Although passive power filters have the advantage of low hardware cost, their performance is often significantly affected by the system impedance. Furthermore, salient problems, including large volume, parallel resonance, and series resonance may further offset the benefits of this method. With advances in power semiconductor technology, power-electronic- based active power equipment is gradually replacing or sharing the role of passive power equipment.
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Estimation of Compensation Current Reference using Fuzzy Logic Controller for Three Phase Hybrid Active Power Filter

Estimation of Compensation Current Reference using Fuzzy Logic Controller for Three Phase Hybrid Active Power Filter

Fuzzy logic controller for three-phase hybrid active power filter is used to generate the switching signals in order to control the output currents of voltage source converter.. Simulati[r]

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Reactive Power Compensation in Single Phase Distribution System using SVC, STATCOM & UPFC

Reactive Power Compensation in Single Phase Distribution System using SVC, STATCOM & UPFC

When SVC (Static Var Compensator) is connected in the system then grid power factor starts improving as the value of capacitor is increasing. Best compensation is achieved at 1400µF (shown in TABLE VI). Since compensation is achieved at such a high value of capacitor, hence cost of the scheme will increase. This is the drawback of this scheme. When STATCOM (Static Synchronous Compensator) is connected in the system then grid power factor starts improving as the value of capacitor is increasing. Best compensation is achieved at 50µF (shown in TABLE VI). Compare to SVC, in case of STATCOM power factor is improved up to 0.9991 and power flow is also increased more than compared to SVC (shown in TABLE VI). Since in this case best compensation is achieved at the value of 50µF only, hence this scheme is cost effective also.
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A Review on Selection and Usage of Modern Active Power Filter

A Review on Selection and Usage of Modern Active Power Filter

With the availability of various APF the selection of the AF for a particular application is an important task for end users and application engineers. There are widely varying application requirements, such as single-phase or three- phase, three-wire and four wire systems, requiring current- or voltage-based compensation. Moreover, there are a number of AF configurations which may cater to the needs of individual users. A brief list of criteria for selection of an appropriate AF for a specific application is discussed in this section. Table 5 shows a brief summary of selection of suitable AF's for specific users.
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Novel Dead-Time Compensation Strategy for Wide Current Range in a Three-Phase Inverter

Novel Dead-Time Compensation Strategy for Wide Current Range in a Three-Phase Inverter

three-phase current waveforms with a-phase dead-time compensation pole voltage in case 405. of adapting conventional DTCS[r]

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Power Quality Improvement in Traction Power Supply Networks

Power Quality Improvement in Traction Power Supply Networks

By the development of electrical railway networks as a centerpiece of transportation across the globe, the supplying power network has been encountering severe power quality problems. These problems are mainly: (1) Negative sequence current which is resulted by utilizing huge single-phased traction loads in a symmetrical 3- phased network. (2) Considerable level of the reactive power. This consuming amount of power is due to the inductive motors and older generation of adjustable speed drives (ASDs) with low power factors, but it is also one of the adverse results of the existence of / in an asymmetrical load in a 3-phased system. (3) Harmonic and sub- harmonics. Traction loads are treated as non-linear loads which cause harmonics in the power supply system [1-4]. Meanwhile, the mentioned drawbacks would lead in some other problems in power network system like increasing the loss in transformers and transmission lines and decrease their effective capacities, disturbance in protective relay operation and etc [5-6].
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A New Hybrid Power Conditioner for Suppressing Harmonics and Neutral Line Current in Three Phase Four Wire Distribution Power Systems
B Rushi Anand, J Karuna Kumari & Ch Satyanarayan

A New Hybrid Power Conditioner for Suppressing Harmonics and Neutral Line Current in Three Phase Four Wire Distribution Power Systems B Rushi Anand, J Karuna Kumari & Ch Satyanarayan

the flow of electric energy by supplying voltages and currents in a form that is optimally suited for the user loads. Energy was initially converted in electromechanical converters. Today, with the development and the mass production of power semi conductors; static power converters find applications in numerous domains and especially in particle accelerators. They are smaller and lighter and their static and dynamic performances are better.

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Design Of Three Phase Three Wire Thyristor Controlled Lc Compensator To Mitigate Reactive Power Loss In Smartgrid

Design Of Three Phase Three Wire Thyristor Controlled Lc Compensator To Mitigate Reactive Power Loss In Smartgrid

exerts a turning force. The rotating blades turn a shaft inside the nacelle, which goes into a gearbox. The gearbox adjusts the rotational speed to that which is appropriate for the generator, which uses magnetic fields to convert the rotational energy into electrical energy. The power output goes to a transformer, which converts the electricity from the generator at around 700V to the appropriate voltage for the power collection system, typically 33 kV.

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Optimal Placement of Solar based DG in Distribution System for minimizing losses and THD using PSO Technique

Optimal Placement of Solar based DG in Distribution System for minimizing losses and THD using PSO Technique

In a specific order of minimization, DG is one of the efforts in the distribution system. Distributed generation is the dispersed generation or decentralized generation or embedded generation which acquires by renewable and non-renewable energy sources. A non-renewable source primly contains gas turbine, reciprocating engine, mini turbine, and fuel cell while a renewable source contains PV solar, wind, mini hydro, geothermal and biomass.

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Impedance Source Converter for PV Application and Stand Alone System

Impedance Source Converter for PV Application and Stand Alone System

Photovoltaic system is very popular and less efficient as only 40% efficiency is there to utilize the 100% irradiance on the panel. However, multistage conversion of power from one source to another reduces the overall efficiency of the system. To improve conversion efficiency in such cases the overall stages are reduced using the impedance source conversion.

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Title :  FUZZY LOGIC CONTROLLER USING SHUNT ACTIVE FILTERAuthor (s) :Santhoshi Gayathri and D.Mary Kavitha

Title : FUZZY LOGIC CONTROLLER USING SHUNT ACTIVE FILTERAuthor (s) :Santhoshi Gayathri and D.Mary Kavitha

The DC facet condenser serves 2 main purposes: (i) it maintains a DC voltage with littleripple in steady state, Associate in Nursing (ii) is an energy storage part to provide real power distinction between load and supply throughout the transient amount. In the steady state, the $64000 power equipped by the supply ought to be adequate to the $64000 power demand of the load plus a tiny low power to compensate the losses within theactive filter. Thus, the DC condenser voltage may be maintained at a reference worth. Generally, PI controller is employed to manage the DC bus voltage of SAPF. The PI controller based approach [15] needs precise linear mathematical model that is tough to get. Also, it fails to perform satisfactorily underneath parameter variations, non-linearity, and load disturbances. This paper proposes a mathematical logic control for DC bus voltage management.
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Novel Technique For The Reduction in Wind Power Generation
S R A P Mallap Maddala & Grandhi Ramu

Novel Technique For The Reduction in Wind Power Generation S R A P Mallap Maddala & Grandhi Ramu

This This paper presents a compensating system for the harmonic currents, the reactive power and source neutral conductor current in three-phase four-wire distribution system fed by non renewable source in wind by using a five-level cascaded H-bridge voltage source inverter (CHB-VSI) based shunt active power filter (SAPF). A controller based on the d-q-0 theory (synchronous reference frame) and in-phase disposi- tion (IPD) modulation technique is introduced for the SAPF. The distribution network which supplies mixed non-linear loads and employing CHB-VSI based SAPF is simulated by MATLAB/SIMULINK software. The per- formance of SAPF is analyzed by using the proposed control technique on the total harmonic distortion of source current, power factor and reactive power. Be- sides, it is illustrated by extensive simulation results, the effectiveness of five-level SAPF on source neutral conductor current.
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