"Simple" : start by revising your other thread:
VFD for 3 phase compressor
VFD for 3 phase condensor fan
NO reversing valve, HP only
VFD for 3 phase for ground loop circulation (or pump and dump pump, etc) pump
Flow meter
Turbine expansion with PM 6 phase micro generator
Some NTC resistors for indoor/outdoor/various line temperatures
Strain gauges on liquid and suction lines in a couple of places for pressure.
Laptop connections, serial USB
ACCURATE Mollier diagram/table of system components
Take all the inputs, Program laptop (e.g. Labview or similar)to compare to optimum operation point on Mollier diagram, readjust the VFDs for overall maximum COP every few minutes. Load the turbine expansion generator (by feeding 60 Hz back to line thru inverter) to control refrigerant flow consistent with optimum Molllier diagram COP point.
Program appropriate shutdown/safety points.
Similar algorithms for solar array peak power points can be used.
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