# US 2026/0074518 A1 · Method of controlling a power system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0074518 A1 - Document ID: US20260074518A1 - Status: Published application - Kind: A1 - Application number: 19/070,496 - Filed: 2025-03-04 - Published: 2026-03-12 - Earliest claimed: 2024-09-10 - Assignees: Delta Electronics, Inc. - Applicants: Delta Electronics, Inc. - Inventors: Yi-Kuan KE; Chia-Ching LIN; Yi-Kai TSENG; Chih-Han KO - Web page: https://patentgrep.com/patent/US20260074518A1 ## CPC - H02J 3/14: by switching loads on to, or off from, the networks, e.g. progressively balanced loading - H02J 3/001: Arrangements for handling faults or abnormalities, e.g. emergencies or contingencies - H02J 3/32: using batteries or super capacitors with converting means - H02J 3/381: {Dispersed generators} - H02J 3/388: Arrangements for the handling of islanding, e.g. for disconnection or for avoiding the disconnection of power - H02J 3/40: Synchronisation of generators for connection to a network or to another generator - H02J 7/35: with light sensitive cells - H02J 9/062: {for AC powered loads} - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A Method of controlling a power system, comprising: determining whether a state of charge of an energy storage system lower than a first threshold value. When the state of charge is lower than the first threshold value, a power generator is activated and determining whether the power generator is abnormal. When the power generator is abnormal, supplying the power to loads by the energy storage system. When the power generator is normal, supplying the power to loads by the power generator. Determine whether the state of charge of the energy storage system is lower than the second threshold value, and reduce a part of loads when the state of charge is lower than the second threshold value. ## Claims ### Claim 1 A method of controlling a power system, comprising: determining whether a state of charge of an energy storage system is lower than a first threshold value; when the state of charge is lower than the first threshold value, a power generator activating and determining whether the power generator is abnormal; when the power generator is normal, supplying the power to loads by the power generator; when the power generator is abnormal, supplying the power to the loads by the energy storage system, and determining whether the state of charge of the energy storage system is lower than a second threshold value; and reducing a part of the loads when the state of charge is lower than the second threshold value. ### Claim 2 (depends on 1) The method of claim 1, wherein determining whether the power generator is abnormal including: determining whether a fuel of the power generator is sufficient, wherein when the fuel of the power generator is not sufficient, determining the power generator to be abnormal. ### Claim 3 (depends on 2) The method of claim 2, wherein determining whether the power generator is abnormal further including: when the fuel of the power generator is sufficient, determining whether a voltage of the power generator conforms to a voltage rating and a frequency of the power generator conforms to a frequency rating; and when the voltage is lower than the voltage rating, adjusting the power generator according to a voltage difference between the voltage and the voltage rating to increase the voltage. ### Claim 4 (depends on 3) The method of claim 3, wherein determining whether the power generator is abnormal further including: when the frequency is lower than the frequency rating, adjusting the power generator according to a frequency difference between the frequency and the frequency rating to increase the frequency. ### Claim 5 (depends on 4) The method of claim 4, wherein determining whether the power generator is abnormal further including: when the voltage cannot be adjusted to the voltage rating, or the frequency cannot be adjusted to the frequency rating, determining the power generator is abnormal. ### Claim 6 (depends on 1) The method of claim 1, further including: when the power generator is determined to be normal, calculating a power difference between a first power and a second power according to the first power provided by a renewable energy device through a bus to the plurality of loads and the second power the plurality of loads required; and when the first power is greater than the second power, absorbing the power difference by the energy storage system from the bus. ### Claim 7 (depends on 6) The method of claim 6, wherein determining whether the power generator is abnormal further including: when the second power is greater than the first power, supplying the power difference to the plurality of loads by the power generator through the bus. ### Claim 8 (depends on 1) The method of claim 1, wherein the first threshold value is greater than the second threshold value. ### Claim 9 (depends on 1) The method of claim 1, further including: when the state of charge is lower than the first threshold value, and the power generator is determined to be abnormal, opening a switch of the power generator and determining whether the state of charge is lower than the second threshold value; and when the state of charge is greater than the second threshold value, providing a power to the plurality of loads by the energy storage system. ### Claim 10 (depends on 1) The method of claim 1, further including: when the state of charge is lower than the first threshold value, and the power generator is determined to be normal, synchronizing a voltage and a frequency of the power generator to a voltage and a frequency of the energy storage system. ### Claim 11 A power system, comprising: an energy storage system connecting to a bus, configured to power a plurality of loads, and the energy storage system including a state of charge; a power generator connecting to the bus configured to power the plurality of loads; a plurality of switches connecting the plurality of loads to the bus, and a controller configured to determine whether the state of charge of the energy storage system is lower than a first threshold value, and whether the power generator is abnormal, wherein when the state of charge is lower than the first threshold value, the controller activates the power generator, when the power generator is normal, the power generator supplies the power to the plurality of loads, when the power generator is abnormal, the energy storage system supplies the power to the loads, and the controller determines whether the state of charge of the energy storage system is lower than a second threshold value, and when the state of charge is lower than the second threshold value, the controller reduces a part of the plurality of loads by the switches. ### Claim 12 (depends on 11) The power system of claim 11, wherein determining whether the power generator is abnormal including: determining whether a fuel of the power generator is sufficient, wherein when the fuel of the power generator is not sufficient, determining the power generator to be abnormal. ### Claim 13 (depends on 12) The power system of claim 12, wherein determining whether the power generator is abnormal further including: when the fuel of the power generator is sufficient, determining whether a voltage of the power generator conforms to a voltage rating and a frequency of the power generator conforms to a frequency rating; and when the voltage is lower than the voltage rating, adjusting the power generator according to a voltage difference between the voltage and the voltage rating to increase the voltage. ### Claim 14 (depends on 13) The power system of claim 13, wherein determining whether the power generator is abnormal further including: when the frequency is lower than the frequency rating, adjusting the power generator according to a frequency difference between the frequency and the frequency rating to increase the frequency. ### Claim 15 (depends on 14) The power system of claim 14, wherein determining whether the power generator is abnormal further including: when the voltage cannot be adjusted to the voltage rating, or the frequency cannot be adjusted to the frequency rating, determining the power generator is abnormal. ### Claim 16 (depends on 11) The power system of claim 11, wherein determining whether the power generator is abnormal further including: when the power generator is determined to be normal, calculating a power difference between a first power and a second power according to the first power provided by a renewable energy device through the bus to the plurality of loads and the second power the plurality of loads required; and when the first power is greater than the second power, absorbing the power difference by the energy storage system from the bus. ### Claim 17 (depends on 16) The power system of claim 16, wherein determining whether the power generator is abnormal further including: When the second power is greater than the first power, supplying the power difference to the plurality of loads by the power generator through the bus. ### Claim 18 (depends on 11) The power system of claim 11, wherein the first threshold value is greater than the second threshold value. ### Claim 19 (depends on 11) The power system of claim 11, wherein when the state of charge is lower than the first threshold value, and the power generator is determined to be abnormal, opening a switch of the power generator and determining whether the state of charge is lower than the second threshold value by the controller, wherein when the state of charge is greater than the second threshold value, providing a power to the plurality of loads by the energy storage system. ### Claim 20 (depends on 11) The power system of claim 11, wherein when the state of charge is lower than the first threshold value, and the power generator is determined to be normal, synchronizing a voltage and a frequency of the power generator to a voltage and a frequency of the energy storage system by the controller.