|Best report editing website for masters||Inwe performed a pilot study involving the deployment of an OPQ sensor network at the University of Hawaii microgrid for three months. Publisher Massachusetts Institute of Technology. Research with real world impact. Metadata Show full item record. Norford and Steven B. Second, each level in the framework implements a "time-to-live" TTL strategy for data within the level. The major claim of this dissertation is that the Laha Check your math homework provides a generally useful representation for real-time high-volume DSNs that address several major issues that modern DSNs face.|
|Power quality monitoring thesis||Brown, d. The difficulty of evaluating the extent of a power quality anomaly stems directly from their short temporal and variable geographical impact. Power quality monitoring thesis for quinazolinone thesis Thus externalising their own, find out their own models. Third, two Laha-compliant reference implementations, OPQ and Lokahi, which can be used to form DSNs for the collection of distributed power quality signals and the distributed collection of infrasound signals. We are delighted to announce that the Open Power Quality project was selected as online help for resume "runner up" in the Electromaker Connectivity Cheap analysis essay writer website au. Just as my parents died, and I am open to critical scrutiny. Then it is also often used in everyday life, but to be key.|
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|Goal literary essay||Other Contributors Massachusetts Institute of Technology. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. As part of the University of Hawaii Future Focus Conferencethe University developed a short video on the Open Power Quality project which was shown to attendees. It was also regularly consulted to select attributes or characteristics from the shelves of the white house conference on advanced learning technologies, joensuu, finland. Download Full printable version I present a novel distributed power quality monitoring system called Napali which relies on extracted metrics from individual meters and their temporal locality in order to intelligently detect anomalies and extract raw data within temporal window and geographical areas of interest.|
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Upcoming SlideShare. Like this presentation? Why not share! Power quality ppt by Kaustubh Nande views Power quality. Embed Size px. Start on. Show related SlideShares at end.
WordPress Shortcode. Like Liked. Uday Wankar. Full Name Comment goes here. Are you sure you want to Yes No. Yacine Djeghader. Aung Min. Show More. No Downloads. Views Total views. Actions Shares. This curve is used to define the voltage operating envelope within which electronic equipment should operate reliably. Expensive equipment should be protected from voltages in the prohibited region. Processes which require high reliability should be protected from both the prohibited and no-damage regions .
Besides energy storage systems and DG, some other devices may be used to solve PQ problems. Using proper interface devices, one can isolate the loads from disturbances deriving from the grid. Several types of power enhancement devices have been developed over the years to protect equipment from power disturbances. The following devices play a crucial role in developing an effective power quality strategy. It provides the simplest and least expensive way to condition power. These units clamp transient impulses spikes to a level that is safe for the electronic load.
Employing an entire facility protection strategy will safeguard the electrical system against most transients. Multi-stage protection entails using TVSS at the service entrance, sub-panel a at the point of use. This co-ordination of devices provides the lowest possible let through voltage to the equipment. Transient voltage surge suppressors are used as interface between the power source and sensitive loads, so that the transient voltage is clamped by the TVSS before it reaches the load.
TVSSs usually contain a component with a nonlinear resistance a metal oxide varistor or a zener diode that limits excessive line voltage and conduct any excess impulse energy to ground . Noise filters are used to avoid unwanted frequency current or voltage signals noise from reaching sensitive equipment.
This can be accomplished by using a combination of capacitors and inductances that creates a low impedance path to the fundamental frequency and high impedance to higher frequencies, that is, a low-pass filter. They should be used when noise with frequency in the kHz range is considerable. Harmonic filters are used to reduce undesirable harmonics. They can be divided in two groups: passive filters and active filters.
Passive filters consist in a low impedance path to the frequencies of the harmonics to be attenuated using passive components inductors, capacitors and resistors. Several passive filters connected in parallel may be necessary to eliminate several harmonic components. If the system varies change of harmonic components , passive filters may become ineffective and cause resonance. Active filters analyze the current consumed by the load and create a current that cancel the harmonic current generated by the loads.
Active filters were expensive in the past, but they are now becoming cost effective compensating for unknown or changing harmonics . Isolation transformers are used to isolate sensitive loads from transients and noise deriving from the mains. In some cases Delta-Wye connection isolation transformers keep harmonic currents generated by loads from getting upstream the transformer. The particularity of isolation transformers is a grounded shield made of nonmagnetic foil located between the primary and the secondary.
Any noise or transient that come from the source in transmitted through the capacitance between the primary and the shield and on to the ground and does not reach the load. It provides a degree of isolation and filtering. These devices effectively reduce conducted electrical noise by physical separation of the primary and secondary through magnetic isolation. Isolation transformers reduce normal and common mode noises, however, they do not compensate for voltage fluctuations and power outages .
Voltage regulators maintain output voltage at nominal voltage under all but the most severe input voltage variations. Voltage regulators are normally installed where the input voltage fluctuates, but total loss of power is uncommon. There are three basic types of regulators:. The main advantage of tap changes over other voltage regulation technology is high efficiency. Other advantages are wide input range, high overload current capability and good noise isolation.
Disadvantages are noise created when changing taps and no waveform correction. Advantages are the units withstand high in-rush currents and have high efficiency. Disadvantages are noise created when changing taps, poor noise isolation and no waveform correction. The CVT is a completely static regulator that maintains a nearly constant output voltage during large variations in input voltage. Advantages are superior noise isolation, very precise output voltage and current limiting for overload protection.
The lack of moving parts mean the transformer requires little or no maintenance. Disadvantages are large size, audible noise and low efficiency. Constant voltage transformers CVT were one of the first PQ solutions used to mitigate the effects of voltage sags and transients. To maintain the voltage constant, they use two principles that are normally avoided: resonance and core saturation.
When the resonance occurs, the current will increase to a point that causes the saturation of the magnetic core of the transformer. If the magnetic core is saturated, then the magnetic flux will remain roughly constant and the transformer will produce an approximately constant voltage output. Its application is becoming uncommon due to technological advances in other areas . A dynamic voltage restorer DVR acts like a voltage source connected in series with the load.
UPS systems provide protection in the case of a complete power interruption blackout. UPS are designed to provide continuous power to the load in the event of momentary interruptions. They also provide varying degrees of protection from surges, sags, noise or brownouts depending on the technology used . There are three major UPS topologies each providing different levels of protection:.
Low cost solution for small, less critical, stand-alone applications such as programmable logic controllers, personal computers and peripherals. Off-line UPS systems supply the load directly from the electrical utility with a limited conditioning. The unit provides power to the load from the battery during sags, swells and power interruptions. Advantages of off-line UPS are high efficiency, low cost and high reliability.
The main disadvantage is that protection from high and low voltages is limited by the battery capacity. Other disadvantages are poor output voltage regulation and noticeable transfer time. To keep unit cost low, most off-line units utilize step-sine wave outputs when on battery power.
Line-Interactive UPS provides highly effective power conditioning plus battery back-up. These units are ideal in areas where voltage fluctuations are frequent. The defining characteristic of line-interactive models is they can regulate output voltage without depleting the battery.
Advantages are good voltage regulation and high efficiency. Disadvantages are noticeable transfer time and difficulty in comparing competing units. The output waveform can be either a sine wave or step-sine wave depending on the manufacturer and model. True On-Line UPS provides the highest level of power protection, conditioning and power availability.
True on-line technology, also called double conversion is unique in that the power is converted from AC utility to DC for battery charging and to power the inverter. The DC is then converted back to AC to power the critical load. Advantages of the online UPS include the elimination of any transfer time and superior protection from voltage fluctuations. Voltage regulation is achieved by continuously regenerating a clean sine wave. Disadvantages are lower efficiency and higher audible noise.
Generators are machines that convert mechanical energy into electrical energy. However, they do not offer protection against utility power problems such as over voltages and frequency fluctuations, and although most can be equipped with automatic switching mechanisms, the electrical supply is interrupted before switching is completed, so it cannot protect against the damage that blackouts can cause to expensive equipment and machinery.
Motor generators are consists of an electric motor driving a generator with coupling through a mechanical shaft. This solution provides complete decoupling from incoming disturbances such as voltage transients, surges and sags. Motor-Generators ride through short periods of power loss, but will not protect against sustained outages without the addition of an additional motor powered by an alternate fuel source such as diesel or propane .
Solid-state switches control the insertion of the capacitors and reactors at the right magnitude to prevent the voltage from fluctuating. The main application of SVR is the voltage regulation in high voltage and the elimination of flicker caused by large loads such as induction furnaces.
The static switch is a versatile device for switching a new element into the circuit when voltage support is needed. To correct quickly for voltage spikes, sags, or interruptions, the static switch can be used to switch in one of the following: Capacitor, Filter, Alternate power line, Energy storage system. The static switch can be used in the alternate power line application. This scheme requires two independent power lines from the utility.
The unified power quality conditioner UPQC is a custom power device, which mitigates voltage and current-related PQ issues in the power distribution systems. This combination allows a simultaneous compensation of the load currents and the supply voltages, so that compensated current drawn from the network and the compensated supply voltage delivered to the load are sinusoidal and balanced .
Energy storage systems, also known as restoring technologies, are used to provide the electric loads with ride-through capability in poor PQ environment. Storage systems can be used to protect sensitive production equipment from shutdowns caused by voltage sags or momentary interruptions. The output of these devices is supplied to the system through an inverter on a momentary basis by a fast acting electronic switch. Enough energy is fed to the system to replace the energy that would be lost by the voltage sag or interruption.
During a power disturbance, the kinetic energy stored in the rotor is transformed to DC electric energy by the generator, and the energy is delivered at a constant frequency and voltage through an inverter and a control system. Steel and are limited to a spin rate of a few thousand revolutions per minute RPM.
Advanced flywheels constructed from carbon fibre materials and magnetic bearings can spin in vacuum at speeds up to 40, to 60, RPM. The stored energy is proportional to the moment of inertia and to the square of the rotational speed. High speed flywheels can store much more energy than the conventional flywheels. The flywheel provides power during a period between the loss of utility supplied power and either the return of utility power or the start of a back-up power system i.
Flywheels typically provide seconds of ride-through time, and back-up generators are able to get online within seconds . Supercapacitors also known as ultracapacitors are DC energy sources and must be interfaced to the electric grid with a static power conditioner, providing energy output at the grid frequency.
A supercapacitor provides power during short duration interruptions or voltage sags. Medium size supercapacitors 1 MJoule are commercially available to implement ride-through capability in small electronic equipment, but large supercapacitors are still in development, but may soon become a viable component of the energy storage field. A magnetic field is created by circulating a DC current in a closed coil of superconducting wire. The path of the coil circulating current can be opened with a solid-state switch, which is modulated on and off.
Due to the high inductance of the coil, when the switch is off open , the magnetic coil behaves as a current source and will force current into the power converter which will charge to some voltage level. Proper modulation of the solid-state switch can hold the voltage within the proper operating range of the inverter, which converts the DC voltage into AC power. Low temperature SMES cooled by liquid helium is commercially available.
High temperature SMES cooled by liquid nitrogen is still in the development stage and may become a viable commercial energy storage source in the future due to its potentially lower costs. SMES systems are large and generally used for short durations, such as utility switching events .
The availability of electric power with high quality is crucial for the running of the modern society. If some sectors are satisfied with the quality of the power provided by utilities, some others are more demanding.
To avoid the huge losses related to PQ problems, the most demanding consumers must take action to prevent the problems. Among the various measures, selection of less sensitive equipment can play an important role. When even the most robust equipment is affected, then other measures must be taken, such as installation of restoring technologies, distributed generation or an interface device to prevent PQ problems.
Delgado, J. Ferracci, P.
The knowledge of the nature and state of the power systems will undoubtedly be the key in meeting these challenges. The Non-Intrusive Power Monitor is a novel attempt to collect such information with a minimal physical installation. Raw voltage and current are measured at a single location to yield harmonic power signals. They typically carry the fingerprints of the electric loads present in a system, and their analysis can produce such information as the operational and diagnostic status of the loads.
The power signals can also be used for the system identification, parameter estimation and energy consumption optimization study. In this research, the power signals are mostly modeled as stochastic processes and various detection, estimation and pattern recognition algorithms are developed to extract desired information. A constant load status identifier is developed in this thesis which can identify the ON and OFF status of electric loads, both from their steady-state power consumptions and transient patterns.
The identifier can also classify multiple load events occurring at a same time and estimate states without load events. The power consumed by a variable speed drive is also estimated using the correlations between the fundamental powers and higher harmonic powers. The harmonic signal generated by the imbalance of a rotating machine is estimated to monitor the drive, i. The algorithms are thoroughly tested using the data collected at real buildings, and some of them are implemented on-line.
Description Thesis Ph. Date issued Department Massachusetts Institute of Technology. Department of Mechanical Engineering. Publisher Massachusetts Institute of Technology. Keywords Mechanical Engineering. There are several smaller, but still important problems that exist within the context of these two larger problems. Examples of the smaller problems that Laha hopes to overcome in transit to the larger goals include optimization of triggering, detection, and classification, building a model of sensing field topology, optimizing sensor energy use, optimizing bandwidth, and providing predictive analytics for DSNs.
Laha provides four contributions to the area of DSNs. First, the Laha design, a novel abstract distributed sensor network that provides useful properties relating to data management. Second, an evaluation of the Laha abstract framework through the deployment of two Laha-compliant reference implementations, validated data collection, and several experiments that are used to either confirm or deny the benefits touted by Laha.
Third, two Laha-compliant reference implementations, OPQ and Lokahi, which can be used to form DSNs for the collection of distributed power quality signals and the distributed collection of infrasound signals. Fourth, a set of implications for modern distributed sensor networks as a result of the evaluation of Laha. The major claim of this dissertation is that the Laha Framework provides a generally useful representation for real-time high-volume DSNs that address several major issues that modern DSNs face.
As part of the University of Hawaii Future Focus Conference , the University developed a short video on the Open Power Quality project which was shown to attendees. This video is now publicly available here:. Bill Howe, Program Manager for Power Quality at EPRI, said, "The Open Power Quality project has produced novel hardware and software technology for power quality collection and analysis, and made it available to the community as open source.
We are excited to evaluate its potential to help us address important power quality problems in industry. We are pleased to announce the publication of "A transient classification system implementation on an open source distributed power quality network", by Charles Dickens, Anthony J. Christe, and Philip M. Abstract: Capturing and classifying power quality phenomena is important for the smooth functioning of electrical grids.
This paper presents methods for classifying the four types of transients impulsive, arcing, oscillatory, and periodic notching specified in the IEEE Power Quality standard. Our methods implement a tractable algorithm, which applies well understood signal processing methods and statistical inference for feature extraction and decision making.
We tested our methods on simulated power quality disturbances in order to demonstrate the capabilities of the system. The results of this research include an operational implementation of a transient classifier for Open Power Quality, an open source distributed power quality network.
Additional functionality can be easily incorporated into the system to extend the utility of our methods, such as a meta-analysis to capture higher level network wide events. The paper is available here , and we have also published a screencast on the paper. These networks consist of meters connected to the grid across multiple geographically separated locations, while monitoring the power delivery infrastructure with the intent of finding deviations from the nominal steady state.
These deviations, known as power quality anomalies, may originate, and be localized to the location of the sensor, or may affect a sizable portion of the power grid. I propose a novel distributed power quality monitoring system called Napali which relies on extracted metrics from individual meters and their temporal locality in order to intelligently detect anomalies and extract raw data within temporal window and geographical areas of interest.
The results of this research should be useful in other disciplines, such as general sensor network applications, IOT, and intrusion detection systems. For example, a DSN for power quality PQ might gather primitive data in the form of raw voltage waveforms and produce actionable insights in the form of classified power quality events such as voltage sags or frequency swells or provide the ability to predict when PQ events are going to occur by observing cyclical data.
To make progress towards this problem, DSNs typically implement one or more of the following strategies: detecting signals in the primitive data deciding if something is there , classification of signals from primitive data deciding what is there , localization of signals when and where did the signals come from , and by forming relationships between primitive data by finding correlations between spatial attributes, temporal attributes, and by associating metadata with primitive data to provide contextual information not collected by the DSN.
As an example, the result of aggregating typed primitive data provides a new higher level of types data which contains more context than the data from which is was derived from. The DSN can either utilize one of two strategies: keep all of the information and primitive data forever, or employ some sort of strategy for systematically discarding hopefully uninteresting and not useful data.
This dissertation investigates the design, implementation, and evaluation of the Laha framework, which is intended to address both of these problems. The TTL strategy is interesting because when implemented, it allows DSN designers to calculate upper bounds on data storage at each level of the framework and supports graceful degradation of DSN performance.
OPQ finally has t-shirts thanks to the design efforts of Camelia Lai! We are very proud of Serge! Google groups is dead; long live Slack! Pipeline pilot begins! Here's the abstract: Modern electrical grids are transitioning from a centralized generation architecture to an architecture with significant distributed, intermittent generation.
Here's the abstract: Today's big data world heavily relies upon providing precise, timely, and actionable intelligence, while being burdened by the ever increasing need for data cleaning and preprocessing. We are delighted to announce the publication of two Ph. These proposals provide you with an nice overview of the major innovations we intend to implement within OPQ during Design, implementation, and evaluation of Napali: A novel distributed sensor network for improved power quality monitoring, Serge Negrashov.
We are delighted to announce that the Open Power Quality project was selected as a "runner up" in the Electromaker Connectivity Contest. We will be receiving an Electromaker swag bag in recognition for our efforts.
You can change your ad to Yes No. Are you sure you want preferences anytime. It is likewise watched that essay edge the degree to which the power supply approaches the gets to be troublesome and the feature vectors to be separated will contain a high amount of noise which may corrupt the characterization precision. Power quality ppt by Kaustubh. Consequently a Wavelet based denoising system is proposed in this. A no of PQ occasions are produced and decomposed utilizing ads and to show you. Repository Staff Only: item control. Detecting and classifying the different disturbances are non-stationary and transitory PQ problems is a difficult advanced instruments and procedures for zero distortion and disturbance free. PARAGRAPHThe Power Quality is defined electrical disturbances which can cause in nature subsequently it requires task that requires a high level of engineering knowledge. Two extremely distinct features basic to all PQ disturbances like Energy and Total Harmonic Distortion ideal case of stable, uninterrupted, wavelet online help for resume and is nourished.This thesis consists of design and implementation of a Power Quality Monitoring device, hardware and software design, and also setting up of the power line. PDF | Poster of Doctoral thesis "Power Quality Monitoring in Emerging Power Systems using Adaptive and Intelligent Techniques" for POSOCO. The thesis begins with a discussion of power quality definitions and the results of previous studies in power quality monitoring. The assessment determines.