Abstract: The present disclosure relates to systems and methods for controlling hydrogen stack power and load. The systems include at least one hydrogen stack, a pressure sensor, and a controller, wherein the controller is operable to increase or decrease the power to the at least one hydrogen stack in response to a change in pressure. The methods include generating hydrogen using at least one hydrogen stack, measuring the pressure of the generated hydrogen, and increasing or decreasing the power supplied to the at least one hydrogen stack in response to an increase or decrease in the pressure.

Abstract: A system for synthesizing ammonia includes a reactor including an inlet portion, an outlet portion, and an energy source arranged to deliver energy to one or more reactants receivable through the inlet portion of the reactor, and the energy source activatable to reduce nitrogen to ammonia in the presence of hydrogen, at least one hydrogen pump in fluid communication with the outlet portion of the reactor, each hydrogen pump including at least one electrochemical cell, and a recirculation circuit in fluid communication between the at least one hydrogen pump and the inlet portion of the reactor and configured to direct a respective hydrogen stream from each hydrogen pump to the inlet portion of the reactor.

Abstract: Systems and techniques for monitoring, assessing, and/or controlling hydrogen production are described. For instance, a system for monitoring, assessing, and/or controlling hydrogen production may include: a plurality of electrolyzers; and a controller configured to: obtain raw data indicative of respective operations of respective electrolyzers of the plurality of electrolyzers over a period of time; obtain command data indicative of one or more commands provided to the plurality of electrolyzers over the period of time; obtain event data indicative of one or more events related to the plurality electrolyzers that occurred during the period of time; generate state data based on the raw data, the command data, and the event data, the state data comprising a respective state of each electrolyzer of the plurality of electrolyzers for each of a number of discrete time periods of the period of time; and perform one or more operations responsive to the state data.

Abstract: A system for monitoring a hydrogen plant includes a plurality of wireless sensor modules, each wireless sensor module including at least one sensor configured for monitoring for at least one condition and a wireless interface configured for transmitting data concerning the at least one condition via a wireless network to a remote station when the at least one condition is detected by the at least one sensor, wherein the plurality of wireless sensor modules cooperatively extend the wireless network to an area of the hydrogen plant wider than a range of an individual wireless interface.

Abstract: The present disclosure relates to systems and methods for controlling hydrogen stack power and load. The systems include at least one hydrogen stack, a pressure sensor, and a controller, wherein the controller is operable to increase or decrease the power to the at least one hydrogen stack in response to a change in pressure. The methods include generating hydrogen using at least one hydrogen stack, measuring the pressure of the generated hydrogen, and increasing or decreasing the power supplied to the at least one hydrogen stack in response to an increase or decrease in the pressure.

Abstract: Systems and methods for synthesizing ammonia include one or more electrochemical hydrogen pumps to recover excess hydrogen gas from the ammonia synthesis product stream. The systems and methods improve overall yield and efficiency of the ammonia production process by separating and purifying hydrogen gas that otherwise would be lost.

Abstract: Hybrid electrocatalyst layers for use in an electrochemical cell and processes for making the same are described. The hybrid electrocatalyst layers include at least one ion-conducting layer and at least one nonionic conductive catalyst layer. The processes for making the hybrid electrocatalyst layers include a sintering step, which provides greater durability of the hybrid electrocatalyst layers.

Abstract: A porous titanium sheet configured to function as an anode side gas diffusion layer of a proton exchange membrane (PEM) electrolyzer is formed by a powder technique, such as tape casting or powder metallurgy.

Abstract: A system for hydrogen generation includes at least one cabinet defining a first volume, a second volume, and a third volume, where the first volume, the second volume and the third volume are fluidically isolated from each other, a water circuit located in the first volume, an electrochemical module including an electrolyzer electrochemical stack located in the second volume, a hydrogen circuit located in the third volume, at least one first fluid connector fluidly connecting the water circuit and the electrolyzer electrochemical stack, and at least one second fluid connector fluidly connecting the electrolyzer electrochemical stack and the hydrogen circuit.

Abstract: A system and method of power management for a power generation system is disclosed. A method of power management for a hydrogen generation system including one or more electrochemical stacks, the one or more electrochemical stacks receiving power from an electrical grid including at least one power source, includes: receiving a frequency or voltage reference value for the hydrogen generation system; continually monitoring a frequency or voltage of the electrical grid; and varying a load of the hydrogen generation system in response to the frequency or voltage of the electrical grid differing from the frequency or voltage reference value to restore the frequency or voltage of the electrical grid to the frequency or voltage reference value.

Abstract: The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

Abstract: A porous titanium sheet configured to function as an anode side gas diffusion layer of a proton exchange membrane (PEM) electrolyzer is formed by a powder technique, such as tape casting or powder metallurgy.

Abstract: A fuel cell system includes a plurality of fuel cell segments, each segment having a plurality of fuel cells. The segments include a positive terminal having a positive voltage with respect to ground and a negative terminal. The fuel cell system also includes at least one component electrically connecting the negative terminal to ground, the at least one component configured to decrease a surge current through the segments.

Abstract: An alternating current (AC) impedance spectroscopy method includes providing an AC impedance spectroscopy ripple from power electronics into an electrochemical device, and absorbing the ripple in the power electronics.

Abstract: The present disclosure generally relates to systems and techniques for power generation. In some aspects, the techniques described herein relate to a method for power generation, including: receiving a forecast of weather impacting renewable energy generation configured to provide power to a load; distributing energy between a plurality of energy storage equipment based on the forecast of the weather, the plurality of energy storage equipment including different types of storage equipment; selecting one of the plurality of energy storage equipment based on the forecast of the weather; and controlling distribution of power from the selected one of the plurality of energy storage equipment to the load.

Abstract: A system for hydrogen recovery includes a dryer having an inlet that may be fluidly connected to a hydrogen outlet of a hydrogen generator, a hydrogen using device having an inlet fluidly connected to a dry hydrogen outlet of the dryer, and one or more conduits fluidly connecting a wet hydrogen outlet from the dryer and an impure hydrogen exhaust outlet of the hydrogen using device to the inlet of the dryer.

Abstract: A system for controlling a photovoltaic (PV)-powered hydrogen production plant includes a plurality of PV modules to receive sunlight and output DC power, wherein the plurality of PV modules are combined in series to create a PV string, at least one power cabinet comprising at least one DC-to-DC power converter to receive DC power from the PV string and provide regulated DC power to an electrolyzer stack, the regulated DC power having regulated output current and/or voltage, and at least one controller to control the at least one DC-to-DC power converter to match the regulated DC power to requirements of the electrolyzer stack.

Abstract: The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

Abstract: A power generation system includes a power source that is configured to communicate with at least one of a downstream load or a downstream device by changing a voltage on a power bus between the power source and the at least one of the downstream load or the downstream device, while power source provides power on the power bus to the at least one of the downstream load or the downstream device.

Abstract: A system for hydrogen recovery includes a dryer having an inlet that may be fluidly connected to a hydrogen outlet of a hydrogen generator, a hydrogen using device having an inlet fluidly connected to a dry hydrogen outlet of the dryer, and one or more conduits fluidly connecting a wet hydrogen outlet from the dryer and an impure hydrogen exhaust outlet of the hydrogen using device to the inlet of the dryer.