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A hybrid electric vehicle, such as a bus or delivery vehicle, includes batteries and a turbogenerator/motor connected through a double conversion control system. The batteries and the turbogenerator/motor are each connected to a DC bus through bi-directional power converters operating as customized

A hybrid electric vehicle, such as a bus or delivery vehicle, includes batteries and a turbogenerator/motor connected through a double conversion control system. The batteries and the turbogenerator/motor are each connected to a DC bus through bi-directional power converters operating as customized bi-directional switching converters configured, under the control of a power controller, to provide an interface between the DC bus and the batteries and turbogenerator/motor, respectively.

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1. A hybrid electric vehicle power generation system, comprising: a turbo generator/motor; a DC bus; a first power converter connecting said turbogenerator/motor and said DC bus, said first power converter serving as an AC to DC convertor when power is supplied from said turbogenerator/motor to

1. A hybrid electric vehicle power generation system, comprising: a turbo generator/motor; a DC bus; a first power converter connecting said turbogenerator/motor and said DC bus, said first power converter serving as an AC to DC convertor when power is supplied from said turbogenerator/motor to said DC bus and as a DC to AC convertor when power is supplied from said DC bus to said turbogenerator/motor; an energy storage device; a second power converter connecting said energy storage device and said DC bus, said second power converter transferring power between said DC bus and said energy storage device; said first and second power converters together serving to regulate DC bus voltage to a desired voltage independent of turbogenerator/motor speed. 2. The system of claim 1 wherein said turbogenerator/motor includes a permanent magnet rotor. 3. The system of claim 1, further comprising: a resistive load connected across said DC bus to dissipate power from said DC bus whenever DC bus voltage exceeds the desired voltage. 4. The system of claim 1 wherein said energy storage device is a battery. 5. The system of claim 1 wherein said energy storage device is a flywheel. 6. The system of claim 1 wherein said energy storage device is an ultracapacitor. 7. A hybrid electric vehicle power generation system, comprising: a DC bus; a permanent magnet turbogenerator/motor; a battery; a power controller that regulates DC bus voltage to a desired voltage independent of permanent magnet turbogenerator/motor speed, said power controller having a first power converter, connecting said permanent magnet turbogenerator/motor and said DC bus, that serves as an AC to DC convertor when power is supplied from said permanent magnet turbogenerator/motor to said DC bus and as a DC to AC convertor when power is supplied from said DC bus to said permanent magnet turbogenerator/motor, a second power converter, connecting said battery and said DC bus, that serves as a DC to DC converter when power is supplied from said DC bus to said battery and as a reverse DC to DC converter when power is supplied from said battery to said DC bus; and a resistive load connected across said DC bus to dissipate power from said DC bus whenever DC bus voltage exceeds the desired voltage.