Unienergy Technologies Llc patents

Managing islanded power systems using battery state of charge and frequency

A battery management system is configured to, in an island mode, cause a frequency adjustment (e.g., by 3 hz) to voltage in the power system based on a state of charge. The frequency adjustment signals assets (e.g., loads, generators, energy storage devices) electrically coupled to a battery system to reduce or increase power. ... Unienergy Technologies Llc

Matching state of charge in a string

A method of operating a redox flow battery string including at least first and second redox flow batteries and an outside power source includes: providing a least first and second redox flow batteries in a string electrically connected in a string, and each redox flow battery having a state-or-charge (soc) and an electrical load, wherein the electrical load for at least one of the first and second redox flow batteries in the string is powered by the outside power source; obtaining an soc value for each redox flow battery in the string; identifying a target soc value in the string; and adjusting the soc value for at least one of the first and second redox flow batteries to correspond to the target soc value by using a portion of stored energy in the at least one first or second redox flow battery to supply power to the electrical load.. . ... Unienergy Technologies Llc

Using energy in electrolyte for black start

A method of operating a redox flow battery includes: providing a redox flow battery configurable to be in off and on states and to be in an islanded state , the redox flow battery including an electrochemical cell in fluid communication with anolyte and catholyte storage tanks, wherein a portion of the anolyte and a portion of the catholyte is contained in the electrochemical cell, and wherein the redox flow battery is at least partially charged; identifying the redox flow battery to be in an off and islanded state; maintaining stored energy in the electrolyte in the electrochemical cell when the redox flow battery is in the off and islanded state; and using the energy stored in the electrolyte in the electrochemical cell to start the redox flow battery and enter the on state.. . ... Unienergy Technologies Llc

Gas management systems and methods in a redox flow battery

A method of operating a redox flow battery includes providing a redox flow battery including an anolyte storage tank configured for containing a quantity of anolyte and an anolyte headspace, a catholyte storage tank configured for containing a quantity of a catholyte and a catholyte headspace, and a gas management system comprising at least one open conduit interconnecting the anolyte headspace and the catholyte headspace for free gas exchange between the anolyte and catholyte headspaces, and a passive gas exchange device in gaseous fluid communication with the anolyte headspace, the passive gas exchange device configured to release gas from the anolyte headspace to an exterior battery environment when an interior battery pressure exceeds an exterior battery pressure by a predetermined amount, and operating the battery.. . ... Unienergy Technologies Llc