Interactive engineering notes.

From a polluted industrial grid to reactive compensation, cascaded control and active harmonic filtering. Four linked experiments with one shared electrical example.

1. 01

   The grid & the pollution problem

   Phase lag, reactive power and the harmonic fingerprint of a non-linear load.

2. 02

   STATCOM: sizing the hardware

   Redirect reactive power, restore voltage and size the inverter coupling inductance.

3. 03

   The brain: cascaded control loops

   A fast current loop, a slower DC-voltage loop and a sudden reactive-power reversal.

4. 04

   Active filtering & harmonic cleanup

   Oppose load harmonics, inspect the source current and explore passive filter trade-offs.

A four-part interactive guide to rotor-flux-oriented control (RFOC): from coordinate transformations to tuned PI loops, using the parameters of a 1.1 kW TER test machine.

1. 01

   Transformations & the decoupled model

   How Concordia and Park turn three-phase AC into two DC quantities: flux and torque.

2. 02

   Machine dynamics & block diagrams

   The induction machine state model and the direct vector control structure, block by block.

3. 03

   Nominal values & open-loop flux estimator

   Deriving nominal torque and flux, then estimating the rotor flux vector and its angle ρ.

4. 04

   PI controller workbench

   Tuning the current, flux and speed loops interactively, and comparing RFOC with V/f control.