Abstract:
A hybrid energy storage module includes a bus lead and two or more high-power modules connectable to the bus lead. A controller is operably connected to a first of the high-power modules and a second of the high-power module. The controller has a pulse mode, where the first high-power module is connected to the bus lead. The controller also has an extended mode, where both the first high-power module and the second high-power module are connected to the bus lead.
Abstract:
A starting/generating system includes a rotor portion and a stator portion. The stator portion is connected to a DC power source during starting operations and to a DC load during generating operations, and includes a DC link having a first and second DC link bus, a DC link capacitor connected between the DC link buses, and an inverter/rectifier that converts AC power to DC power and vice versa. A switching device is connected in series on the first DC link bus and is controlled by a controller that turns the switching device On and Off to provide various functionality to the starting/generating system.
Abstract:
A starting/generating system includes a rotor portion and a stator portion. The stator portion is connected to a DC power source during starting operations and to a DC load during generating operations, and includes a DC link having a first and second DC link bus, a DC link capacitor connected between the DC link buses, and an inverter/rectifier that converts AC power to DC power and vice versa. A switching device is connected in series on the first DC link bus and is controlled by a controller that turns the switching device On and Off to provide various functionality to the starting/generating system.
Abstract:
An energy storage module (ESM) assembly includes an ESM having an energy source and a multi-level dual active bridge (ML-DAB). The ML-DAB is connected to the energy source to source current therefrom, or send current thereto, or both. A system architecture includes the ESM assembly having an ESM with an energy source, and a ML-DAB connected to the energy source to source current therefrom, or send current thereto, or both. The system architecture includes a DC bus connected to the ESM assembly.
Abstract:
Embodiments include systems, methods, and devices for voltage regulation of a hybrid energy storage module (HESM). The embodiments include a system controller including a first voltage regulator and a second voltage regulator, a first HESM coupled to the system controller, where the first HESM is coupled to a first bus, and a second HESM coupled to the system controller, where the second HESM is coupled to a second bus, and the first bus and the second bus are different.
Abstract:
An example electrical power system includes a DC bus including a positive rail configured to provide a positive DC voltage, a negative rail configured to provide a negative DC voltage, and a ground rail. A first ESM and a second ESM are connected to the DC bus. Each ESM includes an energy storage device. The first and second ESM are connected to and configured to provide an output voltage to a respective one of the positive and negative rail. A node connects the first and second ESMs to each other and to the ground rail. A controller is configured to determine values for the output voltages for use during at least one of a discharging mode and a charging mode bus based on a difference between a state of charge value of the first and second energy storage devices. A method of operating an electrical power system is also disclosed.
Abstract:
A DC-DC converter including a DC input and a DC output, at least one switch connecting the DC input to a converter inductor, the converter inductor connecting the at least one switch to the DC output, a controller configured to control an open/closed state of the at least one switch, a first voltage sensor connected to the DC input and operable to provide a sensed voltage to the controller, a second voltage sensor connected to the DC output and operable to provide a sensed voltage to the controller. The controller includes a processor and a memory, the memory storing instructions for causing the controller to dynamically adjust a duty cycle limit of the DC-DC converter to be equal to one minus a numerator divided by a denominator, where the numerator is the instantaneous input voltage minus a compensation factor and where the denominator is the instantaneous output voltage.
Abstract:
A method of starting an aircraft engine is provided. The method includes providing motive power from a generator for starting an engine during an engine start mode and deriving electrical power by way of the generator from rotation of the engine during a generate mode, transmitting the motive power from the generator to the engine during the engine start mode by way of a constant speed drive (CSD) and regulating a frequency of the electrical power output from the generator during the generate mode by way of the CSD and coupling a generator and CSD controller (GCC) to the generator and the CSD and operating the generator and the CSD by the GCC to execute at least the engine start mode and the generate mode.
Abstract:
An example electrical power system includes a bus current controller configured to adjust a direct current (DC) provided on a DC bus, and a plurality of energy storage modules (ESMs). Each ESM includes at least one energy storage device, and includes a DC/DC converter configured to control charging of the at least one energy storage device from the DC bus and discharging of the at least one energy storage device onto the DC bus. A shared system controller is configured to control the bus current controller and the plurality of DC/DC converters. A method of controlling an electrical power system is also disclosed.
Abstract:
An energy storage module (ESM) assembly, ESM and method of balancing current flow on a direct current bus are provided. The ESM assembly includes a bidirectional DC-DC converter, an ESM having first and second energy cell strings connected in parallel relative to one another and configured to be connected to respective inputs of the bidirectional DC-DC converter. The ESM is configured to absorb current from the bidirectional DC-DC converter when the bidirectional DC-DC converter is operated in a buck mode. The ESM is configured to source current to the bidirectional DC-DC converter when the bidirectional DC-DC converter is operated in a boost mode.