Grid Definition and 206 Threads

Hi everyone, I am humbly here to ask a question. I have no EE training or education (as will become apparent) but I couldn't sleep and my head was churning and now I need to know: Can you operate a city or country on solar power generated on the other side of the globe? i.e. Could solar...

What is "The Grid" -- Visualization Maps As PF grows, so does the number of questions about the "grid". While I was searching the internet for an image of a sagging transmission line to use in another thread, I found this cool interactive map by NPR. I thought I'd post it for those curious...

This is a small experiment I would like to conduct. I was told if you can give a scientist a problem, they will always have an answer. No matter how unrealistic. I am here to ask all of you to ponder a practical and realistic way to get people off of the power grid. The ideas expressed should...

Electric Grid Question -- Elevated Transmission Lines Hi, Our teacher gave to us an homework which is if we carry transmission lines at 20000 m (20km) high from Earth face, what is this application's benefits and harms? Can anyone help me? Already thanks for your replies...

Note, this is in the USA, where the street lines are 4,800vac (I think?)...and the lines from the pole are 220VAC to the panel. For example, let's say I'm making 225vac from a DIY solar array (connected to my main panel), and the amount of energy I'm currently producing is more than what...

Hi! When my Hydroelectric station is not connected to a GRID (islanded mode) I control the frequency or the speed, and here are the equations for my turbine: http://oi46.tinypic.com/3127ixe.jpg Look the third equation. I built that in Matlab Simulink, and my out put is turbine speed...

I have a grid and want to determine whether a point lies within (our outside of) a circle. The grid cells simply have integer coordinates, e.g. x = 5, y = 7. The circle's radius is known, and also an integer value. I wrote a program that can place points in a (quantized) circle using...

Homework Statement Consider a grid with height p >= 2 and width q >= 2, so there are pq squares in the grid. A valid walk on the grid is a walk that starts on one square and subsequently moves to adjacent squares (you cannot move diagonally). Define a tour to be a valid walk on the grid that...

I am working on a Bachelors thesis and need to make a grid on a map over a entire floor. Can someone show me how to do this in matlab?

Homework Statement Hi there. I was just wondering if anyone can conform that my method for this problem is correct so far? The transistor-bridge converter shown below is being used to connect a PV array to the grid. For the purpose of this coursework, you may assume that: • The PV array...

I have a uniform grid of data in spherical coordinates. e.g. theta = 0, 1, 2, ... 180 and phi = 0, 1, 2, ... 359 which forms a 2D matrix. I wish to rotate these points around a cartesian axis (x, y, z-axis) by some angle alpha. To accomplish this I currently do the following: 1. Convert to...

Hangout With CERN: LHC and the Grid - Big data, big questions Public · By CERN usually every thursday 5:00pm in UTC+01 http://hangouts.web.cern.ch/ http://youtube.com/CERNTV Last week we showed you how global computing helps CERN store, distribute and analysis around 25 Petabytes...

Homework Statement Given a grid, x by y, where x and y are integers both greater than or equal to one, prove that it is impossible for there to be a point (a,b) where the distance d from (a,b) to three distinct corners of the grid are equal only for these three corners (i.e. the point has to...

I have three grid tie inverters connected to my grid thru standard AC plugs. The system pushes about 1kw to the grid during the day but during the night they draw a total of 45 watts from the grid. This has been confirmed by measuring the ac current in the ac cord with a multimeter and with a...

Electrical Question -- Grid Tie Power Inverters for Home Use Since we are being careful let us assume we have a doll house that is powered by only a 12v source. Inside the doll house, Julie, the doll living there, gets it in her head to construct a 1.2v solar system on the roof of her doll...

Hi, I've been reading up a bit on the shortest path problem in graph theory and was wondering if the problem I'm trying to solve is a variation of the same graph theory problem. Say you have a grid of vertices and edges representing aisles and cross-aisles in a warehouse. In a standard...

Homework Statement Deepa’s house is five blocks west and four blocks south of a bus stop. A store is three blocks west and one block south of the bus stop. How many ways can Deepa walk home if she wishes to stop on her way home by walking only west and south? Homework Equations...

Imagine I have a set of discrete points equally spaced out and indexed from 1 to n (a 1D grid). On a cartesian grid if the spacing, dx, is constant the index can be obtained simply by: i = floor(x/dx) That was pretty simple, now if the cartesian grid is stretched (i.e. dx is not constant)...

How can one create a uniform solid-angular distribution of vectors in 3D space from a common origin, or in other words a grid of points on the surface of a sphere wherein the points are equidistant from each other? Spherical polar coordinates/the latitude-longitude scheme is obviously not the...

When a vacuum tube data sheet states that it will conduct a given amount of milliamps with a designated grid voltage (the anode and cathode voltages being fixed in this example), is this grid voltage given with respect to the anode plate or cathode? I find it confusing because the grid voltages...

Hi guys, I am doing a final year project this semester on the above topic. I wanted to know whether to implement hardware or using software like Matlab. Thanks in advance.

Hello , i am trying to implement this algorithm for 2d grid. 1) i am not sure if my calculations are correct. 2 ) i don't understand how to return my final calculation ( how will i insert to the matrix i want (the 's' in this example) the new coordinates (xup,xdow,yup,ydown)). I mean ...

Troubleshooting a problem ...Urgent please ! hello everyone , I'm working on 30-Bus grid with Powerwolrd simulator ( version 15 ) and I'm facing some troubles with the results ...I got some different values from the one I was expecting , such as low voltages on some of the buses , different...

Hello! Is there a way to regulate grid transparency in matlab? Thanks, Uku

Hello, I'm new here and not sure where to put this question, which is more of a mathematical question, but also involves some programming in python (mainly the use of numpy.fft). I have a code which creates a square image with dimensions 4x4 arcsec running from -2 arcsec to +2 arcsec and...

In the case of a power grid or generator failure, the former which chernobyl was testing for and the later which occurred at Fukushima - why can't you stay online, use the electricity your producing to power the pumps and sink the excess electricity into the ground? I have no engineering...

I've read about wire-grid polarizers from wikipedia. The article says that waves perpendicular to the wires cannot induce electron movement and hence they pass through with minimal energy loss. On the other hand, waves parallel to the wires are reflected by the wires because electron movement is...

I've read about wire-grid polarizers from wikipedia. The article says that waves perpendicular to the wires cannot induce electron movement and hence they pass through with minimal energy loss. On the other hand, waves parallel to the wires are reflected by the wires because electron movement is...

I could rephrase the same question, why does the frequency decrease when load exceeds generation? I know these are fundamental operating characteristics of a power system network but I'm not sure I can mathematically prove it. My best guess is that everything dissipates more power when the...

Utility poles have a grounded wire. Is this just for lightening? Is not connected the neither one of the 3 phase wires, is it? Is the static electricity wire always present, and is it grounded (at every pole, or every x poles)? What does the multi-grounded neutral wire do, and has it always...

what is the difference between Grid and Sub-station?

what is the difference between Grid and Sub-station?

Hi for a project i need to connect a synchronous generator to the electrical grid, i need to use 2 curcuit breakers and . How to determine the cross section of the cables required and how to connect them to the 2 curcuit breakers.

Hi! I'm trying to implement an implicit scheme for the continuity equation. The scheme is the following: http://img28.imageshack.us/img28/3196/screenshot20111130at003.png With \rho being the density, \alpha is a weighing constant. d is a parameter that relates the grid spacing to the...

Hi! I'm implementing a scheme to solve the following equation \frac{\partial \psi}{\partial t}=-c_{s} \cdot \frac{\partial \phi}{\partial x} \frac{\partial \phi}{\partial t}=-c_{s} \cdot \frac{\partial \psi}{\partial x} c_{s} is just the isothermal velocity of sound. The equations are for a...

Hi, I am in processing of sizing a generator that biomass as fuel to be fed back to the grid as part of feed in tariff initiatives. However, I would like to know roughly how this feeding mechanism works. For example, in a workshop, a machine motor would initially draw up to 5X the rated motor...

What is the national Grid? Where does it run? How does it work? What is a transformer? 3 Advantages of the national grid 3 disadvantages of the national grid Any help would be a great help. :D

I found a recent article suggesting that solar storms predicted in in the next few years pose a serious threat to the electrical grid and thus to nuclear plant cooling systems: "Severe Solar Storms Could Disrupt Earth This Decade: NOAA," International Business Times...

This is a problem that I just thought of the other day and am intrigued by, let me set it up. You have an n x n grid of dots, so that each dot is 1 away from the four dots closest in each direction. My question is; for a grid of n2 dots, what is the total number of possible combinations of...

What is a "lock-in amplifier with a forcing grid"? The context of the title is in an undergrad paper, concerning plasma waves in an glow discharge column. The paragraph which mentioned this is in the section of the paper, Suggestions for Further Research: The most important step remaining...

What causes this effect? What am I seeing?

[b]1. I have not seen IEEE 1547-2003 as this question pertains to it. They say that small PV systems are tied into the grid, if the wave sign of a PV inverter is a square wave how does that marry to the wave of electricity flowing on the existing grid? Does this current just get gobbled up so to...

Hi, this might be a stupid question, but I was wondering how to computer the gradient of a quantity on a grid. I mean I have a grid made of cells (not necessarily of the same size) where the variable \rho is defined at the center of every cell. How can I compute the gradient of this quantity? It...

First, my apologies ... my last math class back in high school, sophomore year geometry, many years ago. I am a graphic designer, but have discovered an interesting math problem and would like some help identifying what it is and how to better express and use it. Thanks for any help! And...

In North America, awareness of smart grid/smart meters remains low. Mainstream media doesn't discuss much about this technology. People who protest against it get arrested. So, I got curious. Could you describe your biggest concern relative to smart grid/smart meters? I was told to search...

Hi, I need help with simply starting to prove this. I'm terrible with proofs and even the easy ones are hard for me. Any tips to get started in the right direction would be appreciated. A city represented by an infinite square grid of blocks is on fire. Every day, the status of city block is...

Hey all - this is my first post on the forum but I've browsed for help for a really long time on other topics. Any help would be greatly appreciated! So I have a function, called stability.m that takes in two independent variables, say x and y, as input and outputs either a 1 or a 0 for each...

Greetings, How far apart should the wires be on a 2.4 GHz parabolic grid antenna? Is it determined by the frequency? Thanks

Hi all, i would like to know if there is anything working on power grid simulation or other related work. I'm currently working on power grid simulation and would like to talk to people with experience in it. Any idea how to simulate the power grid with distribution generations like solar...

I'm reading The Lightness of Being by Frank Wilczek and I'm trying to work out what credence I should give the idea of "The Grid". Several questions. Isn't his "Grid" just the same as the old fashioned idea of ether? If not, how does it differ from "ether"? How does this idea stand...