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.
36 questions
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Difficulty of Finding Global Solutions in AC-OPF: Are There Documented Hard Instances?
In the power systems literature, it is commonly stated that the AC Optimal Power Flow (AC-OPF) problem is challenging due to its non-convex nature, and that interior-point methods like IPOPT may ...
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Does my solution on a power flow question make sense?
I have this power flow circuit: I am preparing for a exam in power flow. I solved this method using the Newton-Raphson algorithm and after the 3rd iteration it pretty much converges and I get a ...
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How to calculate maximum power flow on a branch?
I'm currently reproducing the OPF results from the following paper: Adjustable Robust OPF With Renewable Energy Sources with pandapower. Since my background isn't EE, I'm striving to find how to ...
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Single phase load flow usecasee
I am learning power systems and now reading about load flow. I understand loadflow is used to initialise a network to steady state. I started by building a single phase network in Simulink which has ...
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Why 230 V shows up in a staircase light circuit even though 'live' is disconnected? Why is there no continuity between the light bulb and neutral?
There's a staircase light circuit in my house similar to the one shown below. I disconnected 'live' from the switch on the left and measured the voltage between its 'L1' terminal and neutral and then ...
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1 vote
2 answers
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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 ...
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3 answers
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Difference between voltage and phase angle
The voltage at a node can be described by $$ V = |V|e^{j \delta} $$ in which \$\delta\$ is the voltage angle. Voltage angles are required to calculate AC power flows. The phase angle if often ...
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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 ...
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How to calculate target impedance for the power trace if it is connected to multiple loads?
In this image, the source 3.3V, which is going to three loads(U1,U2,U3), that consumes current of 2A,0.5A and 1A respectively, As the total current is 3.5A. Lets consider allowable ripple, U1-2% U2-3% ...
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Why is the change in reactive power not equal to the line reactance drop?
I am working on an equivalent network of a two bus system right now. I know the \$P\$, \$Q\$ and power factor at Bus 2. Bus 1 is taken as a slack bus (\$V = 1 PU\$, \$\delta\$ = 0). Using iterative ...
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Clear my confusion on PV or PQ nodes of power system with renewables?
A solar PV is connected to a node of the power system through a converter circuit. Is it possible to understand that the solar PV operating at its maximum power point (MPP) is considered a PQ node? Or ...
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5 votes
1 answer
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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 ...
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1 answer
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How can I check if a relay module is conducting electricity?
I want to know if a 5V water pump connected to a classical relay module which is connected to (SBC) ESP32s's GPIO can check if there was a failure in water pump and no electricity is flowing through ...
2 votes
1 answer
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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}\$ ...
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2 votes
1 answer
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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 ...
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