Volume 7 | Issue 3 | July

 Abstract

In industrial power system the unintentional series and/or parallel resonances are tuned with passive filter and the line inductance which result in severe harmonic distortion. This paper presents a hybrid active filter to suppress harmonic resonance and to reduce harmonic distortion by using fuzzy logic controller. In power system the hybrid filter is operated as variable harmonic conductance according to the voltage total harmonic distortion so, harmonic distortion has reduced to an acceptable level. Since the hybrid filter is a seventh- tuned passive filter and an active filter in series connection, both dc voltage and kVA rating of the active filter are decreased compared with the pure shunt active filter. In real application the active power filter with fully power electronics is very expensive. A reasonable tradeoff between filtering performances and cost is to use the hybrid active filter. Furthermore, this paper discusses filtering performances on line impedance, line resistance, voltage unbalance, and capacitive filters.

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 Keywords

Harmonic resonance; hybrid active filter; industrial power system

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 Abstract

As of late, combination of distributed generation (DG) in circulation systems has expanded to high entrance levels. The effect of DG units on the voltage stability margins has moved toward becoming significant. Current lining procedures are instruments which can be utilized to find and size the DG units in the system, to use these units ideally inside specific breaking points and imperatives. Along these lines, the effects of DG units issues, for example, voltage soundness and voltage profile, can be broke down successfully. A definitive objective of this paper is to propose a strategy for finding and estimating DG units to move forward the voltage dependability angle. The load and inexhaustible DG generation probabilistic nature are considered in this investigation. The proposed technique begins by choosing competitor buses into which to introduce the DG units on the system, organizing buses which are delicate to voltage profile and subsequently enhance the voltage strength angle. The DG units' series and measuring is figured utilizing blended number nonlinear programming, with a target capacity of moving forward the security angle; the requirements are the system voltage limits, feeders' ability, and the DG infiltration level.

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 Keywords

Distributed generation (DG); distribution system; optimum power flow; voltage profile; voltage stability

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 Abstract

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 Keywords

Flexible AC transmission systems (FACTS); unified power flow controller (UPFC); transformer-less; multilevel inverter; power flow control

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 Abstract

In this paper, enhanced hierarchical control structure with multiple current loop damping plans for voltage unbalance and harmonic compensation in ac islanded micro grid is proposed to address unequal power sharing issues. The distributed generation (DG) is legitimately controlled to independently remunerate voltage unbalance and harmonic while sharing the pay exertion for the real power, reactive power, unbalance and harmonic forces. The proposed control arrangement of the micro grid for the most part comprises of the positive sequence real and reactive power droop controllers, voltage and current controllers, the specific virtual impedance loop, the unbalance and harmonics compensators, the optional control for voltage abundancy and frequency reclamation, and the assistant control to accomplish a high voltage quality at the point of common coupling (PCC). By utilizing the proposed unbalance and harmonic compensation (UHC), the helper control, and the virtual positive/negative-grouping impedance (VPI/VNI) loops at key frequency, and the virtual variable symphonious impedance (VVHI) loop at harmonic frequencies, an exact power sharing is accomplished. Besides, the low transfer speed correspondence (LBC) system is embraced to send the remuneration summon of the optional control and helper control from the micro grid current control (MGCC) to the dSPACE 1006 stage are exhibited to show the viability of the proposed approach.

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 Keywords

virtual variable symphonious impedance (VVHI); unbalance and harmonic compensation

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 Abstract

An improved fuzzy controller is used for power rating, filter size, compensation performance and power loss. At the front end of a voltage source inverter (VSI) an LCL filter has been used, which provides better switching harmonics elimination while using much smaller value of an inductor as compared with the traditional L filter. A capacitor is used in series with an LCL filter to reduce the DC-link voltage of the DSTATCOM. This consequently reduces the power rating of the VSI. With reduced DC-link voltage, the voltage across the shunt capacitor of the LCL filter will be also less. Therefore, the proposed DSTATCOM topology will have reduced weight, cost, rating, and size with improved efficiency and current compensation capability compared with the traditional topology. A systematic procedure to design the components of the passive filter has been presented. Here fuzzy logic is used for controlling and compared with DSTATCOM fuzzy controller provides maximum efficiency.

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 Keywords

VSI; DSTATCOM; Reactive power compensation

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 Abstract

In this project, cost of various energy storage advancements is lessening rapidly and the combination of these developments into the power grid is transforming into a reality with the methodology of brilliant grid. Dynamic voltage restorer (DVR) is one thing that can give improved voltage rundown and swell pay with energy storage coordination. Ultra capacitors (UCAP) have low-energy thickness and high-control thickness flawless qualities for pay of voltage records and voltage swells, which are both events that require high power for constrained abilities to center time. The novel responsibility of this paper lies in the blend of rechargeable UCAP-based energy storage into the DVR topology.

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 Keywords

DC-DC converter; D-Q control; DSP; dynamic voltage restorer (DVR); energy storage integration

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 Abstract

In the an improved Unified Power Quality Conditioner (iUPQC), for power factor compensation, voltage and current harmonics compensation, voltage sag and swell compensation, grid side bus voltage regulation and load bus voltage regulation for the combinations of linear and non-linear loads. The iUPQC will work as both STATCOM and conventional UPQC compensation, at the grid side and at the load side respectively. The iUPQC controller composes of PLL and PWM controller which is used for generating reference signal for shunt converter and also the Proportional Integral Derivative controller (PID) which is used for generating reference signal for series converter.

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 Keywords

iUPQC; Micro-grids; Power quality; STATCOM; Unified Power Quality Conditioner

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