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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.

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 [1].

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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 necessary for this. What happens to excess energy fed into the power…
W. Churchill
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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 computers, but it seems to me that those loads are not…
Bur Nor
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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 probably not trick them into feeding power to the…
Louis Somers
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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 nominal voltage \$V_{ref}\$, a CCVS that models a…
FernandoPT
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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 Sensitivity Study of Consensus Algorithm-Based…
Derek Topovski
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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 the current is not properly configured. I've been…
Roopesh G L
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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 frequency and voltage. I have studied a literature…
Steve
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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)), wherein the transfer function that relates power output…
SaJ
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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 to calculate the load flow or the active power…
karagedon
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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 stress on the power lines? Basically I would like…
PeterBe
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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 \$V_C = 0\$; Natural Response) Grid Side Current…
Niteesh Shanbog
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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 the Generator supply rises or falls accordingly.…
J R_AU
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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 the microinverter assists with powering the load…
Malvineous
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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 I know: That MPPT charge controllers work by…
MechE
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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 see there is an energy device that I install in…
Mohammed Elchal
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