Hydraulic Governor (HG) in Standalone Micro-Hydro generating Systems (SMHS), for maintaining voltage and frequency at desired levels, is not preferred as HG is much costlier than the generator. Electronic load controller (ELC) is a cost-effective solution for this application. Resistive (dump) load at an equal rating of generator is used to maintain constant voltage and frequency at the load perturbations. However, the system receives electrical and mechanical stresses as it operates at full load throughout the life which causes degradation of its component and lifetime reduction. This paper reviews the development trends of ELC used for SMHS and identifies the shortcomings of available technology for it. After the review, it proposes a novel methodology to enhance the generator efficiency and its lifespan by reducing the amount of dump load used. Performance of generator with conventional and proposed methodologies is investigated experimentally and lifespan is estimated through temperature profile. In addition, generator protection from sensor faults is enforced in proposed controller for enhancing the reliability of the system. © 2018 Karabuk University

Raja Singh R

Department of Energy and Power Electronics

School of Electrical Engineering

Vellore Campus

Kumar B.A

Shruthi D

Panda R

Raj C.T.

Fulltext

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Engineering Science and Technology, an International Journal

For the growth of high voltage transmission power cables, it is necessary to calculate the current and voltage values. Current Transformers (CT) are used to convert the larger current values into smaller values. CT develop the convenient way of measurement in an alternating current transmission line. If CT becomes saturated then secondary current in a CT gets distorted because of a larger primary current. This distorted secondary current leads to a malfunction in the measurement side. So, detection and correction of the distorted current caused by the saturated CT becomes essential. To avoid these problems, we can use Rogowski Coil (RC) to measure the alternating current.RC is a toroidal coil used for measuring alternating current without touching the conductor. A RC is an evenly wound coil of N turns per meter on a nonmagnetic core of constant cross-sectional area A. Normally an alternating current produces a magnetic field when current flows through a conductor. RC is used to sense the magnetic field and rise to an induced voltage within the coil which is proportional to the rate of change of the current being measured. This RC current measurement is based on adopted reconstruction methods. In this paper, use two reconstructions methods to measure the alternating current. They are Analog integrator and Numerical Differentiation (ND). These reconstruction methods providing accurate as well as reduced time for correctly tracking the measured current.

International Journal of Engineering & Technology

Design of rogowski coil to measure the power frequency alternating current

Micro-hydel plants are used in micro-grid or off-grid areas where there is an adequate availability of hydro potential. In general, micro-hydel systems are embedded with synchronous or asynchronous generator based electronic load controller (ELC) to have better frequency stability. Conventional ELC operate the generator with full load capacity regulating the generator output voltage and frequency. The conventional controller has a demerit of less efficiently. This paper presents a reduced dump load strategy (RDLS) with fault detection and isolation (FDI) for reliable operation of micro-hydro generators. Proposed strategy protects the system from load disturbances and isolates the system during line fault and sensor fault. Reduced dump load strategy with FDI enhances the machine’s lifespan and protects the system from catastrophic failure. Practical implementation of developed reduced dump load strategy using Full Spectrum Simulator (FSS) with 3 HP generator is presented in this paper. The presented methodology includes coding based FSS for controlling the dump load and switching operation.

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Journal	Data powered by TypesetEngineering Science and Technology, an International Journal
Publisher	Data powered by TypesetElsevier BV
ISSN	2215-0986
Open Access	Yes