Voltage Management Articles

  • Protection Relay for Shaft Current and Voltage

    Introduction The paper deals with the specific protection relay for all types of generators. The instrument, called Shaft Current and Voltage Protection Relay (SCVP) was developed at KONCAR – Electric Engineering Institute Inc. This instrument is a part of Institute's product line used for monitoring and diagnosis of rotating electrical machines. The most important parts ...

  • Performance improvement of indirect vector controlled induction motor drive using multi–level inverter

    Multi–level inverter has emerged as an important topology in the area of high power–medium voltage control applications due to its several advantages such as a better output voltage with reduced total harmonic distortion (THD), reduction of voltage ratings of the power semiconductor switching devices and also the reduced electro–magnetic interference problems etc. This paper presents the ...


    By Inderscience Publishers

  • Three–level NPC rectifier–based midpoint converter–fed SRM drive

    This paper deals with a three–level Neutral Point Clamped (NPC) rectifier–based midpoint converter–fed Switched Reluctance Motor (SRM) drive. The three–level NPC rectifier for midpoint converter–fed SRM drive is used for improving power quality at AC mains and to balance the DC link capacitor voltages. The proposed three–level NPC rectifier is designed, modelled and its performance simulated ...


    By Inderscience Publishers

  • Assessing the socioeconomic effects caused by overvoltages to residential blocks: the case of Greece

    One of the most important problems in the operation of electronic equipment in the residential blocks is the overvoltages. Direct damages of overvoltages lead to a loss of value (technical cost), whereas indirect damages result in the loss of opportunity (social cost). The assessment of these costs is of particular importance especially to countries, which are hampered by the current financial ...


    By Inderscience Publishers

  • Starting performance optimisation of two-leg AC voltage controller-fed three-phase induction motor drive

    This paper analyses the starting performance of two-leg AC voltage controller-fed three-phase induction motor drive and establishes that optimum value of firing angle combination for the voltage controller depends on the motor parameters. Identically rated machines with different motor parameters are used for the work. Optimum firing angle combination is obtained from the simulation, which gives ...


    By Inderscience Publishers

  • Selective harmonic elimination in VSI–fed induction motor drives using swarm and genetic optimisation

    The paper presents non–traditional solutions to the problem of selective harmonic elimination (SHE) in induction motor drives fed by three–phase voltage–source inverter (VSI). The problem is independently solved using genetic algorithms (GA) and particle swarm optimisation (PSO). The inverter switching angles are determined such that the low–order harmonics up to the 17th are eliminated, while ...


    By Inderscience Publishers

  • Hardware implementation of three–phase VSI using PIC16F877A microcontroller and optimisation using PSO

    This paper reports hardware implementation of three–phase inverter using selective harmonic elimination technique by PIC16F877A microcontroller, whereas the notch angles are calculated through particle swarm optimisation (PSO) technique. This technique is proposed to minimise the overall total harmonic distortion (THD) of the output voltage of PWM inverter and corresponding switching angles are ...


    By Inderscience Publishers

  • Transport for Greater Manchester – LEC – Bus Stations

    The Customer Transport for Greater Manchester is the delivery arm for the Transport for Greater Manchester Committee, which is responsible for investing in improving transport services and facilities, supporting the largest regional economy outside London. TfGM’s vision is “To improve the quality and availability of transport networks and services, supporting the ...


  • Carlton Court Hospital part of the Norfolk and Waveney Mental Health NHS Foundation Trust case study

    About Carlton Court Hospital Carlton Court Hospital is part of the Norfolk and Waveney Mental Health NHS Foundation Trust, serving the Great Yarmouth and Lowestoft areas, with a mix of elderly and adult inpatient and outpatient services, as well as Team base for the community mental health nurses. A new Adult facility completed in 2005 already contains some green credentials such as ...


    By iESCo

  • The Association of Greater Manchester Authorities (AGMA) case study

    The implementation of cost saving green technology has reduced energy spend across Greater Manchester’s public sector bodies by over £500,000 every year. Using Official Journal of the European Union (OJEU) approved procurement and by implementing cross organisational communication, AGMA has been able to adopt Voltage Power Optimisaton across 90 sites. By becoming early adopters of VPO ...


    By iESCo

  • Roehampton University case study

    About Roehampton University Roehampton University is a campus university situated on three major sites at Roehampton in south-west London, in the United Kingdom. The listed buildings stand in grounds close to Richmond Park and Putney, with central London a few miles away. Today the University has a broad range of expertise across the arts and humanities, social sciences and the human and ...


    By iESCo

  • Bristol City Council Fairfield High School case study

    About Bristol City Council and Fairfield High School Fairfield High School is a specialist performing and virtual arts college under the authority of Bristol City Council. It is designed as a horseshoe shaped building, rising to a maximum height of six storeys, with a central atrium as the school assembly hall. The school provides a high level of insulation with 100 mm thick mineral fibre ...


    By iESCo

  • Maximising Savings with Voltage Optimisation

    This article compares different voltage optimisation technologies and illustrates the advantages of the comec inv (induced negative voltage) technology for achieving the best energy saving results in commercial facilities. Saving electricity by regulating and controlling voltage is not a novel idea. The basic principles stem from the fundamental laws of electricity, and the UK market has been ...


    By PowerSines Ltd.

  • Voltage Optimisation can improve schools energy efficiency by up to 25%

    Voltage Optimisation is a key component in any energy efficiency programme and could deliver up to 25% savings on electricity bills. In April the registration period for the Carbon Reduction Commitment (CRC) Energy Efficiency Scheme will start again. Local authorities and companies with a portfolio of private schools will face sizeable fines unless they account for their energy use ...


    By Vital Efficienci Ltd.

  • Three-level 24-pulse STATCOM with optimised magnetics to regulate voltage in transmission system

    In this paper, a 24-pulse three-level ±100 MVAR STATCOM (static synchronous compensator) is evolved employing 4 × 6-pulse NPC GTO-VSCs (neutral point diode clamped gate-turn-off thyristor based voltage source converters) with magnetics optimised to a single stage. Through an angle control, the magnitude and phase angle of the STATCOM voltage is controlled with a pre-calculated dead angle in d-q ...


    By Inderscience Publishers

  • Eighteen-sector switching strategy for torque ripple reduction of direct torque controlled induction motor drive

    Direct torque control (DTC) is an emerging technique for controlling the PWM inverter-fed induction motor drives (IMDs). The low number of voltage vectors, which can be applied to the machine using the basic DTC scheme, may cause undesired torque and current ripple. This paper proposes DTC 18-sector switching strategy, where the d-q flux locus plane is divided into 18 equal sectors, which lead to ...


    By Inderscience Publishers

  • Voltage Optimisation Technology proven capacity to save energy

    Voltage Optimisation, can save British companies an average of 13% in electricity consumption and carbon emissions, reports ...


    By Vital Efficienci Ltd.

  • Development of modulation strategies for three-phase to two-phase matrix converters

    In this paper, the modulation strategy is developed for three-phase to two-phase matrix converters for synthesising balanced and unbalanced output voltages from balanced and unbalanced input voltages. Reduction of low order input current harmonics with sinusoidal output voltages is achieved by using the proposed switching strategies. The other advantage of the proposed method is the significant ...


    By Inderscience Publishers

  • Instantaneous voltage measurement technique for PWM voltage source inverters

    The pulse width modulated (PWM) voltage source inverter (VSI) is almost universally used in industrial motor drives. Although measurement of the VSI output voltage is required in many applications, accurate measurement is problematic due to the high frequency inverter switching. Many commonly used inverter output voltage measurement methods, such as indirect and direct voltage measurement, ...


    By Inderscience Publishers

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