Questions tagged [microgrid]
Microgrid is defined as a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid. A microgrid can connect and disconnect from the grid to enable it to operate in both grid-connected or island mode.
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How to change a storage device to charge in an off-grid microgrid via PowerWorld simulator
I am having trouble figuring out this: setting up an energy storage device on charge mode via PW.
So, I have designed an off-grid microgrid that I uploaded a photo of to speak for itself.
As you can ...
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What sets a proper grid-forming inverter apart from a regular power station?
I have been told here that disconnecting solar panels with micro-inverters (like Enphase, APsystems or NEP) from the grid, and connecting a power station to the group using a suicide cable will ...
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Zero power in droop control of an isolated DC microgrid
I am trying to simulate the droop control in an isolated DC micro-grid as shown in the figure. There is a constant voltage across the load as expected (~800 V), but the output power is zero. I think ...
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Why is the voltage rising when I expect a voltage drop in my model?
matlab model
In the model, I have four blocks each with three homes. I am feeding the homes with a three phase voltage source. On the way to homes there are resistors and inductors so I expect ...
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Obtaining the State Space representation of a microgrid by combining the state space models of the subsystems
I am trying to obtain the state space model of the DC microgrid shown in the figure. It is made of three converters connected in parallel. Each one is modeled with a voltage source that outputs the ...
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Stability analysis of hybrid discrete-continuous systems
I'm trying to derive the overall state-space system model for a hybrid system, in order to plot its eigenvalues.
The system is shown as follows:
Which is originally from this paper: Modeling and ...
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Design calculations for LVDC grid
I'm looking to use 60 V to create a small LVDC grid to power up some small loads - 12/24/48 V maximum. For the purpose of this question I will assume 12 V only loads.
60 VDC will be the power supplied ...
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Grid forming inverter control
I have been working on a project where the three phase voltage source inverter has to be controlled in so called grid forming mode of operation i.e. the inverter creates three phase grid of fixed ...
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How can energy "physically" be fed back into the grid?
I have found some similar questions (below), but I am still having issues understanding what is "physically" happening when energy is "fed back into the grid" and the equipment ...
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Representation of Photovoltaic cell and BESS in Microgrid by first order transfer function
I am working in the are of frequency control of Microgrid and have come across many publications (For example: https://www.sciencedirect.com/science/article/abs/pii/S0142061515005220 (Pg 3,5)), ...
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How to calculate load flow/power flow in a DC grid?
From my understanding this depends exclusively on the voltage level, but I have not found documentation about how this happens or is done.
Is it purely based on KCL?
Are there any tools or procedures ...
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How do I design a microgrid using Simulink?
I have to do a project in which I have to model a microgrid which is controlled by using reinforcement learning techniques.
In doing so I have a problem, because I study control systems and I don't ...
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MW versus MWh is one total capacity and the other maximum output?
I still don't completely understand MW versus MWh, I have been working on a Wikipedia article for Tesla's "megapack" battery which are measured in both.
I assumed one was an indication of how much ...
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Does peak shaving reduce the stress on power lines
I am not an eletrical engineer and have a question about demand side management in smart grids. One application is peak shaving, which means that the maxium power is reduced. Does this decrease the ...
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Feeding grid transformers via secondary, primary disconnected
I am interested in how transformers are used in the electrical grid, with a view of one day building an isolated "microgrid" for educational purposes. I am however having some difficulty getting some ...
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Using Constant Current Power Supply to control Load Output of a Grid-Tie Inverter
tldr: How do I adjust the power being dumped by my grid tie inverter? Is it possible to use a constant-current power supply to do so?
I am planning create a PV system that will help reduce my ...
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DC Fault Characteristics of a Voltage Source Converter
According to this paper, the three stages in the DC Fault characteristic of a VSC are
Capacitor-Discharge State (Natural Response)
Diode Freewheeling Stage (When source AC gets disconnected and \$...
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Microgrids in Alaska
I was looking to survey some microgrids and I couldn't get the following information.
Are the microgrids commissioned in Alaska DC, AC or a hybrid topology? And is the transmission system used just ...
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Precise definition of a "radial" electrical distribution system topology
I'm confused about what is meant by "radial" topology of an electrical distribution system. This site claims we can generally group electrical distribution systems into three classes: radial, loop, ...
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Does a supergrid approach confront with distributed generation?
I have heard many times about supergrids and distributed generations (small scales generation connected close to the loads). In a supergrid scenario, a efficient and clean production of electricity (...
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How do I keep DC voltage high in a building grid?
I'm trying to create an off-grid installation.
I have 200W PV panels, 20A charge regulator and two 150Ah, 12V batteries in parallel.
How can I keep the voltage constant through all the grid in the ...
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Grid tie inverter on Generator Set
I have a grid tie inverter powered by a 24V battery connected to a circuit that is on a Generator. The grid tie inverter syncs well and outputs 655 – 800W according to the Load. As the load changes ...
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Addition of step disturbance to a microgrid state space model
If we are having a microgrid model in the state space form as \$\dot{x} = Ax\$ where \$A\$ is complete system matrix.The matrix \$A\$ includes all the active power , reactive power, load currents, ...
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How is the inverter connected to the grid?
I just finished circuit designing of an inverter which converts 440V DC to 230V AC. Now my manager asked me what kind of connectivity does it has.
I answered him:
"The current connectivity is AC as ...
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Can grid-tie inverters charge UPS batteries if connected to the UPS output?
If you have a UPS powering some load in an off-grid situation, and you have a solar panel with a grid-tie microinverter, is it possible to connect the grid-tie inverter to the UPS output, such that ...
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Feeding energy to the power grid
I am doing a research about the electricity grid and a marketplace where neighbours can trade energy with each other.
I found out if your PV cell has excess energy you can with an inverter put it ...
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Addition of a Disturbance to a Microgrid system
I have a microgrid system which is represented in state space model by
\$\dot{\mathbf{x}}= Ax \$. The dimension of \$A\$ is \$32\times32\$ . I want to introduce a step disturbance in one of the ...
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What are those nonlinear loads in real microgrids/grids?
I have read in literature that nonlinear loads can impact on the operation of the so called microgrids. However, when I heard nonlinear loads I think in electronic devices such mobile phones or ...
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how to design a microgrid
I am working on designing a theoretical microgrid for a school building, but before I can even select theoretical components, I need to select what the structure of my microgrid will be.
Here's what ...
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What is interoperability in microgrids?
I have encountered the word "interoperability" in many papers with regards to "microgrids". However, there are no clear explanation for it. What does it exactly mean?
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