Search Engine

45 Threads found on Grid Connected
Which instrument is detecting a grid vector jump, and what are the detection criteria? How is the generator connected to grid (inverter?)
Hi, how are the wires connected, shows a single green wire connecting to 8 reed switches. this is correct. It is like in your house. One wire coming from the grid goes to several switches in your house. Form the switches there are independet lines to the load(s). Klaus Btw: instead of connecting 8 MUXes to the 64 switc
Hi, in this design, can I use the PL504 instead of the 6dq6, since the last grid of the PL504 is internally connected to the cathode? What changes would be needed, and what short of performance (output power) would you expect at the same anode voltage?
The current sensor should be connected after the EMI filter. i.e. between the Inverter and the utility mains. Not necessarily. In case the sensor is utilized for inverter overcurrent detection or space vector modulation with direct current control, it must be placed on the inverter side of the output filter. The output filter is mor
grid connected inverter Your switching signals must always obey the grid waveform. By modulating it with your sawtooth waveform, this generates the control signals you need for mosfets S1-2-3-4. This diagram shows how the waveforms interact. obrazki.elektroda.
Hey guys about fuel cell system connected to the grid, do you think that the fuel cell should deliver the exact energy to match the load, or would it be better to deliver the maximum power of the fuel cell to the load and the surplus power would go the grid? I say this because fuel cells use hydrogen as fuel and it is not cheap, hence to (...)
it is much more regulated than this. No only does frequency matter but phase lag/lead when grid connected. There is a central authority who manages phase frequency specs and outputs of each supplier to grid. Adjustments are made to efficiently transfer ( buy/sell) power to also compensate for power factor ( lag/lead) and adjust frequency (...)
Hello all, I have a 5kW 220Vac solar inverter that should be connected to the grid. First off all, are all main distribution boards have three phase busbars? If so, would there be an unbalanced power distribution over 3 busbars with only one single phase inverter connected? How will it affect the grid? Secondly, (...)
Hi, I'd like to build a 3-phase DC to AC inverter that can regulate its output around 230V and frequency 50Hz and can be connected to the grid. I'd like to hear from professional people what is the most powerful microcontroller that can be used ? I am using PIC micro and have been advised to use PIC18F2331 as it contains many PWM ch . What is your
Hi, I have read that some topologies of grid connected inverters can only work for UPF, because the DC link capacitor is disconnected from grid during freewheeling period. Could some one explain or give references regarding reactive power transfer in grid connected inverter. Thanking you.
Hi. I need to matlab/simulink model for grid connected to photovoltaic with only inverter. with out dc dc converter.
So was this radiated noise I had the power going from the inverter to the line in, well I switched directly to the inverter and voila problem solved I have my high speed internet back up and running on my battery bank or conducted noise. Not clear if this was grid connected line in , which was used my modem brick or ?
your inverter is connected to grid. so you need phase angle of the grid voltage. obtain it with any convenient method. suppose the angle of current is measured referenced to angle of voltage vector. decompose current vector in a frame in which voltage vector is x-axis, and an axis perpendicular to voltage vector . As you know in-phase (...)
I fear it's not so easy to derive a "typical" impedance characteristic of a grid connected power converter. I presume, you're referring to a grid connected inverter or a bidirectional converter with "active front end" (AFE), in other words a PWM bridge connected through an inductor or LC low-pass filter to (...)
If the input voltage is sourced from power grid, you have to think also about expectable surges and applicable overvoltage category. The imagined "voltage divider" element must be able to withstand rather high overvoltages. Provided the AC/DC converter is a regular off-mains switcher, it's input voltage must not necessarily be a pure sine and no
It looks like you learnt a valuable lesson to use plastic screwdriver for tuning gaps on magnet wire, as it appears the grounded L2 shorted out with the grid connected L1 possibly causing thermionic emission of grid particles in the inert gas, now making the gas "leaky" and hotter which in turn causes the grid to glow with (...)
Many recent wind turbines use inverters to connect to the grid. A standard VFD has however a rectifier input stage that can't source AC power. A possible topology has two back-to-back connected inverters with a DC link.
You missed out the most important concept - "anti islanding", the ability to disconnect all power sources if the incoming grid connection fails. It is a legal requirement that all sources of power are immediately isolated from the grid to preven it being 'back driven' from the inverters. In view of it being a wireless controller, you would also ha
The term power factor does not apply to a transistor. Power factor is the ratio of the real power divided by the indicated power, i.e. W/V X A. It is used in AC circuits (mains mainly), because the grid generators do not enjoy having a reactive load (low PF), so they put a limit on the PF connected to the mains. Frank
This is the solar panel I will work with (245 Wp): I am in India, and I would like to try to design a micro-inverter that can be grid-connected. This will particularly be useful for the poorer rural communities who would not be able to afford buying inverters from outside the country.
But if i connect two 230v AC sources in series. What will happen..? will any problem occurs ? Depends on the AC sources... To allow series connection, the sources (or least one of them) most be isolated (not connected to ground like the utility power grid) and have sufficient insulation strength against ground to withstand the vo
Hi Can anybody pls suggest me how to implement a harmonic compensation algorithm for a grid connected solar photovoltaic system.. Which is the latest and best method used to implement the same? Thanks in advance..
Hi. I need to matlab/simulink model for grid connected to photovoltaic. please send mdl file to my email:
i would like to do project related with smart grid and solar or wind energy.we are getting a fund of maximum 3 lakhs if we do so..we should submit our idea within march 25..please do post your ideas...
A grid-tie inverter is the sort of thing you are looking for, I think. They usually have an higher voltage input than a SLA battery though, 48V upwards generally I think. They are really intended for connecting a renewable DC source like a photovoltaic array or wind turbine into the grid. When connected and given power, they basically (...)
Hello everyone, I am working on MPPT Schematic for a PMSG stand-alone wind energy conversion system. I have seen from my literature review that grid-connected WECS are better analyzed than stand-alone systems. Hence, I would like help in clarifying some of my doubts. Find attached (my impressions of) a schematic of a Stand-Alone WECS. http:/
there must be a power port not correctly connected to a pin or wire. they may overlap and it is hard to see. Make sure you work with a large grid. Altium also has an electrical grid which will automatically snap to the nearest wire or pin.
Phase lock algorythms for grid tie inverter should have a very low bandwidth and resistance to false crossing trigged by transient spikes common to power grid. Bandwidth can be so low that reaction is measured in tens of seconds to minutes. Real grid frequency changes very very slowly so anything that tells you otherwise is always (...)
The advantage of d-q based control is to have explicite access to real and reactive power transfer to the grid. You can design the grid tied inverter control based on alpha-beta as well. For the stand-alone operation, you are setting frequency and voltage. Real and reactive power are demanded by the load. The more critical point is to control th
You can identify the relation of the 3 phases, but not a "type", because you don't know which one is R, S, or T. These are arbitrary assignments, only meaningful if you have a second connector or cable that's connected to the same grid.
It's quite normal to operate solar panels with inverters without a battery. Solar energy harvesting with grid connected inverters is using this scheme. But the operation mode is different. In energy harvesting, the solar panel is operating at the maximum power point and the inverter will supply all available power to the grid, whatever it (...)
I need to design grid connected solar micro inverter. I have studied that micro-inverters (solar) can be connected with each other to provide power needed by the grid. Generally one micro-inverter provide 230W power and they can be connected to each other to provide more power. grid (...)
hi this is pradeep doing mtech in nit.i want matlab/simulink model for pv sytem.please send mdl file to my email
What's exactly a single phase motor in your opinion? A motor must have a rotating field at least to produce a starting torque. So "single phase" only means, it can be connected to a single phase grid, but internally, it utilizes phase shift. Most "single phase" motors are either two-phase (capacitor) motors or split pole (split phase) motors.
I think the good point to start you is with the DC/DC converter control.... then move to Inverter Control and then grid synchronization.
What are the design issues that I should pay attention when construct a grid-connected Power Inverter so that the inverter can be connected to power grid without problem? Thanks.
As a first comment, none of the shown circuits would be able to source 400 W. The first, may be 200, and the second a few ten, at best. Both have also serious flaws that most likely prevent from reliable operation. The second comment, it's impossible to operate this simple type of inverter grid connected.
Even if you disconnect Mains, you still need to Earth GND connection, also make sure your monitor and verything else connected on the same grid
Hi all, I want to control grid connected inverter's output power through RS-232 output port. Is there any body who give me any suggestion/idea/book refference,please? Thanks in advance. Lina.
Hi, you can use a digital or analog PLL for grid synchronization. I use a differential amplifier connected to the grid (after AC breakers). The output of the differential amplifier after rectification is going to the input of regulator (inverting input of TL494). Other input of regulator (noninverting) is connected to the (...)
Hi all, I am looking for a grid connected inverter for wind terbine/PV which can be controlled through the interface controlled port (RS232, RS485, RJ45, CAN).If you have that kinds of inverter pls.let me know and send me your user guide for details. Thank you for co-operation. Farhana.
hi, Suppose you had a matrix called subsets that has all possible and connected permutations of some cells in a grid. That means that if you had 9 moves then the matrix called subsets has 9 entries with numbers that show which cells are visited and with which order. This matrix is very long In order to reduce that length i must th
What means "public power" goes out. Are your inverters connected in the grid power? I mean, are you generating power in the grid from an alternativ power source (solar, hidro etc)? If it's so, when your main power shut off, you have to disconect your inverters from the grid instantly and let them only to power your home.
There are several aspects of this. The first is the legal aspect. The owner of your power grid may need to give you specific permission to do this. The technical aspects are just the same as for a steam generated power plant. You have to adjust the voltage and phase angle relative to the grid to make real (not reactive) power flow into the
After my opinion , It's a power surge protector. If the voltage is too high it will turn the power off for some time after it will act the same as before. Does it connects to the power grid with an adaptor or direct cable?