Voltage Management Articles
-
An improved power quality boost–flyback SSIPP fed BLDC motor drive
This paper presents a single–stage isolated power factor corrected power supply (SSIPP) fed permanent magnet brushless DC (BLDC) motor drive. An advantage of fast voltage regulation with single voltage control loop of SSIPP is utilised to develop a power factor correction (PFC) based BLDC motor drive. The speed of BLDC motor is controlled by varying the DC link voltage of the voltage source ...
-
Optimal generation expansion planning considering maximum loadability limit
This paper describes a new approach to generation expansion planning (GEP) problem to optimise simultaneously multiple objectives such as cost and stability margin. It is formulated as a combinational optimisation problem in order to determine the type and capacity of the new generations as well as their timing and placement. This study presents a comprehensive model of hierarchical optimisation ...
-
Voltage stability of radial distribution networks for different types of loads
The paper presents voltage stability analysis of radial distribution networks. A new voltage stability index is proposed for identifying the node, which is most sensitive to voltage collapse. It is shown that the node, at which the value of voltage stability index is minimum, is more sensitive to voltage collapse. For the purpose of voltage stability analysis, constant power, constant current, ...
-
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 ...
-
Identification of weak buses and elements participation in voltage instability of large multi bus power system
In heavily loaded systems, voltage stability limit is usually dominant and voltage instability is usually observed following large disturbance. This is typically the case in the deregulated environment as the transmission systems are operating under more stressed condition due to increased transaction level associated with open access. In this paper simple voltage stability analysis is carried ...
-
Optimal location of DG for maintaining distribution system stability: a hybrid technique
To enhance the distribution power quality and maintains the voltage stability is a challenging tasks in the complex distribution network. This can be achieved through the distributed generation (DG). In this paper, a hybrid technique has been proposed which improves the distribution stability by allocating the DG at the optimal place. This technique uses the artificial neural network (ANN) and ...
-
Optimal allocation and sizing of DG and shunt capacitors using differential evolutionary algorithm
In the last few years, a number of factors have led to an increased interest in distributed generation (DG) scheme because placement of DG is the most effective method in reducing the power loss of the distribution networks to serve remote loads. Placement of shunt capacitors improves voltage profile but unable to serve remote load as it can provide only reactive power. So, combination of both ...
-
Stabilisation of grid connected wind farms using doubly–fed induction generators with FACTS controllers
The impact of the wind generation on the power systems is no longer negligible if high penetration levels are going to be achieved. It is very important to boost the transfer capability of the transmission system while improving the utilisation of transmission assets to accommodate high penetration of wind power on the network. Hence, more sophisticated control schemes using advanced power ...
-
Difference between Frequency and high-frequency forklift
First, the difference between the high frequency and power frequency Workers Electric Reach Truck charger power devices operating in the linear state, which means he used up the power device is always at work, and therefore would result in low efficiency of his work, generally in the range of 50% to 60%, have to say he is good linear power. Linear power supply works, so that he must change from ...
-
Fuel Cell Voltage Monitoring Considerations
Knowing what’s happening inside a fuel cell is a critical function, especially as fuel cells are continuing to be developed. One important aspect of this is to measure the voltageof each cell in a stack. Although this may sound trivial, it can be more complex and more expensive than it may at first appear due to high voltages, high channel counts,communication types, etc. There are a few ...
-
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 ...
-
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 life ...
-
NHS – Calderstones Partnership NHS Foundation Trust case study
About the Calderstones Partnership NHS Foundation Trust Calderstones NHS gained its ‘Foundation Trust’ status in 1993, which allows it a larger degree of independence from both the Department of Health and the local NHS Strategic Health Authority than other NHS trusts. It is also classed as a NHS Mental Health Trust, providing specialist care and services for those with learning ...
-
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 ...
-
Advanced Voltage Optimsation Technology
Electric appliances with inductive characteristics, such as refrigerators, air conditioners and compressors are more efficient when the voltage suppliedis regulated and stabilised. This article will explain the physical principles behind voltage reduction on inductive loads, and will include case studies depicting energy savings using powersines comec (a universal energyefficiency controller) in ...
-
Empirical Saving Measurements with PowerSines
To measure saving results in energy efficiency projects is not a trivial task. The modern voltage optimisation solution should not only control the voltage efficiently, but also provide a built-in mechanism for measuring saving results. With the rise in electricity prices, the readiness offinancial institutions to provide investments and the availability of government incentives for energy ...
-
Weakest bus identification for optimal location for FACTS systems in multimachine power network
As a result of the electronic revolution in power electronics technology, a number of control devices under the term flexible AC transmission system (FACTS) have been proposed and implemented and this has led to improvements in efficient energy transfer, reduced looses and maximised use of existing infrastructure. FACTS controllers have been designed using high power electronic system components, ...
-
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 ...
-
Photovoltaic string disconnect switches
PV system arrays generate DC current. The solar modules are wired in series, and the system voltage is the sum of the maximum output voltage of all of the modules in a string. 600 Vdc maximum was chosen as an optimal system voltage to reduce installation costs by reducing conductor size and to stay below the 600V threshold in NEC Article 490. Prior to the growth in the number of installed PV ...
-
Evaluation of voltage source IGBT converters for three-phase induction motor drives
Modern induction machine (IM) drives are subject to a variety of system perturbations, i.e., weak grid conditions and the resulting DC-link voltage fluctuations, that could possibly compromise machine performance characteristics such as speed, torque, and load current. This paper investigates such circumstances, specifically the influence of DC-link variations on the IM drive under different ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you