05/12/2019 at 12:44 •
I have decided to first develop a simple DC supply voltage controller that will be the basis for two configurations described in the introduction (controller acting as a voltage source for the self sustained DC "grid"; controller connected to the grid-tied inverter).
Controller is a simple PI regulator that determines the motor torque based on DC voltage reference and measured DC voltage:
Parameters are currently set with experimentation, but there should be a simple way of defining the coefficients based on system parameters (capacitance, torque constant, rotational speed).
For the "proof of concept" test I used a simple power resistor as a load for DC supply:
Voltage reference was set at 15 V (voltage controller running at 1kHz), while resistor was connected and disconnected multiple times. Voltage remained constant while the motor current changed according the the DC supply energy demand:
Here is a video of the multimeter and power resistor connected to the controller DC terminals:
After some additional testing I will add the support of the new mode and parameters to the PC GUI.
05/05/2019 at 09:24 •
Simplest way for me to test different energy conversion functionalities is to build a back-to-back setup. I have coupled two brushless outrunners enclosed in a plexiglass tube for protection. It is not the optimum solution for long term testing, due to heat build-up, but it will suffice for SW testing.