VHDL codes for battery charge & discharge and Control startegy used in Hybrid system

I'm also wondering about the underlying system topology. In a usual hybrid car, the (high voltage) battery voltage is the DC bus. There's no DC/DC converter ("charger") between both. The motor/generator inverter gets/puts it's power directly from/to the battery. This topology is suggested by the fairly constant battery voltage and efficiency considerations. Additional energy storage/generation systems with variable voltage (supercap, fuel cell) will be connected through DC/DC converters, also possibly the low voltage power supply bus.