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.

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502 views

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 ...
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1answer
29 views

Power line rating conversion

How do I convert a real power line limit to a current flow magnitude line limit? Specifically, for a line connecting bus \$i\$ to bus \$k\$ (with \$j\$ denoting the imaginary element), I compute ...
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0answers
32 views

How to model P, V variations in PV buses in a load flow problem?

I'm trying to use the DC power flow results as a base, and modify it to approximate AC power flow results more accurately. So far, I have been able to do that in a few simple test cases from Matpower, ...
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0answers
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Solving power flow equations: subsets of variables, parameters, and equations

At each bus \$i\$ in a power grid, there are four quantities of interest \$V^i\$, \$\theta^i\$, \$P^i := P_g^i - P_d^i\$ and \$Q_g^i - Q_d^i\$. The power flow equations provide two equations \$P_{\...
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1answer
33 views

Matrix-Vector equation for active and reactive power in a transmission line

Suppose that we know vtilde (the complex voltage phasor vector at all buses), C the incidence matrix for a network, ...
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1answer
43 views

Power Flow Analysis

So I have this network in the figure below (100 MVA base) that I need to model with DC power flow line reactances and etc. Im attempting to set up the estimation matrix and have the following, but ...
2
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1answer
612 views

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 ...
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0answers
62 views

Change in frequency in a grid that has lost generation?

I have an example about droop and it asks to calculate final frequency in a grid after one generator power generation is lost. The answer is given as 59.889 Hz; however, I am calculating as 59.99 Hz. ...
0
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1answer
85 views

Symmetrical three-phase power flow problem, √3

I have done quite a lot of research regarding the power flow problem for the steady state operation of an electric system. In many papers about the power flow problem the power flow equation are ...
0
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1answer
76 views

Power flow analysis issue

simulate this circuit – Schematic created using CircuitLab I'm trying to get the hang of power flow analysis and I can't figure out how to measure the power (P and Q) between two inductances. [...
2
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1answer
624 views

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 ...
7
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2answers
1k views

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 ...
6
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1answer
3k views

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 ...
6
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3answers
999 views

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 ...