Electrical Engineering Stack Exchange
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Questions tagged [power-flow-analysis]

Power flow analysis is a steady-state analysis whose target is to determine the voltages, currents, and real and reactive power flows in a system under a given load conditions.

Power flow analysis is a steady-state analysis whose target is to determine the voltages, currents, and real and reactive power flows in a system under a given load conditions.

The purpose of power flow studies is to plan ahead and account for various hypothetical situations. For example, if a transmission line is be taken off line for maintenance, can the remaining lines in the system handle the required loads without exceeding their rated values.

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Large power-systems for power-flow study

I have just been started on a research project which involves finding ways to speed up the solution time of the power-flow problem which is basically calculating voltages at each of the buses of a given power system. I have a few data-sets like…
smilingbuddha
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Equations of Power Flow Between Buses

I'm working in a MATLAB algorithm to compute the state estimation of a power system given some measures. The classical method computes a Jacobian matrix of all the measures, so I have to program all the derivatives of all types of measures. The…
Daniel Turizo
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Producers consumers balance in the grid

In a large distribution grid, it is said that consumers and producers must be in balance; what that means physically, in correct (not simplistic) mathematical formulation, is not clear: perfect balance doesn't exist in nature and I'm fighting to…
curiousguy
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How to deal with optimal power flow problem in MATLAB?

I am writing an optimal power flow (OPF) program. OPF is an optimization problem in which some decision variables like Generation, Load dispatch are adjusted in power flow program so as to minimize the objective function (usually cost of…
Masan
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Why does electricity flow into a capacitor (charged the other way round) but not into into a diode in this circuit?

I'm trying to understand the workings of the following circuit that I've both emulated and built physically so I know it does work (I did it in a different simulator, but I've redrawn it here for your convenience - animated gifs from the simulator…
ElecCur
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Gauss Seidel method for power flow analysis

I need to write a matlab code for a power flow analysis using the Gauss-Seidel method. I have done the first part of the question, but I cannot figure out how to do the second one. The figure given on the assignment is the following: The question…
xxs899
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When we can say 0 and 1 in digital electronic?

I'm confused when seeing wires contain GND and VCC in a schematic. Mainly their flows. I never confused when see in digital logic wires schematic like logic gates. I understand flows in digital schema. Meanwhile i don't understand how flows in…
Muhammad Ikhwan Perwira
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Slack bus is the grid?

At the slack bus, there is a generator that can change his output instantly. I was wondering if exists in the grid this generator. We use it to study power flow problems but I don't think that there is a generator in the grid (that of the slack)…
Samuele Benito Di Gioia
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Voltage sensitivity coefficients for unbalanced radial distribution feeders

I am wondering if my implementation of voltage sensitivity coefficients for unbalanced three-phase-four-wire radial distribution feeders is correct. We got \$\bar{V}\$ for phase(s) of all the buses and \$\bar{Y}\$, the admittance matrix of the…
Edward
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Help with a DC motor speed controller circuit

I have a circuit which i'm trying to rebuild because the original stopped working due to a short-circuit (mechanical caused) First i copied exactly how the circuit was made, with no modifications and i made this sketch (i'm kind of new to…
charly989
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Harmonic Power Flow

What is the fundamental differences between the conventional AC Power Flow (CPF) & Harmonic Power Flow (HPF)? Is HPF simply a combination of CPFs at different frequencies? Instead of finding the set \$\{V, \theta ,P ,Q\}\$ for all nodes, does HPF…
Joy
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Reversal of power through a electric transmission line

From my undergraduate classes I know that active power flows from the bus with the higher power angle \$\delta\$ to the bus with a lower power angle. If I want to reverse the direction of power flow I would now have to increase the power angle of…
GradGuyTobi
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How is this capacitance affecting other parts of the circuit?

I'm attempting to drive a matrix of LEDs. Columns. Rows. It flickers too much for my liking, so I tried smoothing the LEDs with capacitors, but I'm getting very odd behaviour. Here is a minimal schematic of my test setup: The A1-A3 and C1-C3 lines…
Sod Almighty
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How to change per unit base before power flow calculation

I want to change the per unit base from transformers to a grid. My understanding can be illustrated by the following example (from example 3.4 in [glover2017power]). To be specific, \$V_\text{base1}\$ + \$S_\text{base}\$, \$V_\text{base2}\$ +…
Edward
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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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