# US 2019/0319481 A1 · Microgrid system and method for managing malfunction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0319481 A1 - Document ID: US20190319481A1 - Status: Published application - Kind: A1 - Application number: 16/467,074 - Filed: 2017-12-05 - Published: 2019-10-17 - Earliest claimed: 2016-12-09 - Assignees: Hyosung Heavy Industries Corporation - Applicants: Hyosung Heavy Industries Corporation - Inventors: Dae Geun JIN; Bo Gun JIN - Web page: https://patentgrep.com/patent/US20190319481A1 ## CPC - H02J 3/32: using batteries or super capacitors with converting means - G01R 31/08: Locating faults in cables, transmission lines, or networks - H02H 1/0007: {concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445)} - H02H 7/22: for distribution gear, e.g. bus-bar systems; for switching devices {(detecting mechanical or electrical defects in gas-insulated switchgears H02B13/065)} - H02H 7/26: Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured (locating faults in cables G01R31/08) - H02J 3/00125: {Transmission line or load transient problems, e.g. overvoltage, resonance or self-excitation of inductive loads (H02J3/01 takes precedence)} - H02J 3/38: Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel - H02J 3/381: {Dispersed generators} - H02J 9/06: with automatic change-over {, e.g. UPS systems} - H02J 13/1311: {using the power network as support for the transmission} - H02J 13/14: the power network being locally controlled, e.g. home energy management systems [HEMS] - H02J 9/062: {for AC powered loads} - H02J 2101/10: Dispersed power generation using fossil fuels, e.g. diesel generators - H02J 2101/20: Dispersed power generation using renewable energy sources - H02J 2101/40: Hybrid power plants, i.e. a plurality of different generation technologies being operated at one power plant - H02J 2105/10: Local stationary networks having a local or delimited stationary reach - Y02B 70/30: Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level - Y02B 90/20: Smart grids as enabling technology in buildings sector (smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00) - Y02E 40/70: Smart grids as climate change mitigation technology in the energy generation sector - Y02E 60/00: Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation - Y02P 80/14: District level solutions, i.e. local energy networks - Y04S 10/123: the energy generation units being or involving renewable energy sources - Y04S 20/12: Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages - Y04S 20/248: UPS systems or standby or emergency generators - Y04S 40/121: using the power network as support for the transmission - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS ## Abstract Provided is a microgrid system having: a plurality of distributed power sources; a plurality of distributed loads; and lines for connecting the distributed power sources and the distributed loads, the microgrid system including: an ESS for storing power supplied from all or a portion of the distributed power sources and supplying the stored power to all or a portion of the distributed loads; an ESS PCS including an interruption means for converting the power stored in the ESS into AC power suitable for the microgrid and supplying the AC power to the microgrid in order to block connection to the microgrid in an abnormal state; and a monitoring/control device for gradually increasing a voltage output from the ESS PCS and performing processing for the failure when a failure is detected in the microgrid. ## Claims ### Claim 1 A microgrid system having: a plurality of distributed power sources; a plurality of distributed loads; and lines for connecting the distributed power sources and the distributed loads, the microgrid system comprising: an ESS for storing power supplied from all or a portion of the distributed power sources and supplying the stored power to all or a portion of the distributed loads; an ESS PCS including an interruption means for converting the power stored in the ESS into AC power suitable for the microgrid and supplying the AC power to the microgrid in order to block connection to the microgrid in an abnormal state; and a monitoring/control device for gradually increasing a voltage output from the ESS PCS and performing processing for the failure when a failure is detected in the microgrid. ### Claim 2 (depends on 1) The microgrid system according to claim 1, wherein the monitoring/control device performs steps of: blocking the distributed power source and the ESS when a failure is detected in the microgrid; connecting the ESS PCS to the microgrid; gradually increasing the voltage output from the connected ESS PCS and determining a position where the failure occurred; and blocking the position where the failure occurred and connecting the distributed power source to the microgrid ### Claim 3 (depends on 1) The microgrid system according to claim 1, wherein the interruption means includes: a DC-stage switch for interrupting a battery and an inverter of the ESS; an AC-stage switch for interrupting the inverter of the ESS PCS and the microgrid; and an IGBT interruption means for interrupting an IGBT constituting the inverter. ### Claim 4 (depends on 1) The microgrid system according to claim 1, wherein an open time of an IGBT constituting an inverter of the ESS PCS is within 400 [μs], and wherein a time for gradually increasing the voltage output from the ESS PCS is a period of time specified in a range of 1 second to 3 seconds. ### Claim 5 (depends on 1) The microgrid system according to claim 1, wherein the monitoring/control device includes a communication means capable of communicating data with a detection/measurement means installed in the distributed power sources, the distributed loads, and the lines. ### Claim 6 (depends on 1) The microgrid system according to claim 1, wherein the monitoring/control device gradually increases the current from 0 [A] to a level of 80% of a rated current that can be output to the microgrid for a specified period of time in order to gradually increase the voltage output from the ESS PCS. ### Claim 7 A failure management method for a microgrid system having: a plurality of distributed power sources; a plurality of distributed loads; lines for connecting the distributed power sources and the distributed loads; and an ESS for storing power supplied from all or a portion of the distributed power sources and supplying the stored power to all or a portion of the distributed loads, the failure management method comprising steps of: blocking the distributed power source and the ESS when a failure is detected in the microgrid system; connecting a PCS of the ESS to the microgrid; gradually increasing a voltage output in the PCS of the ESS and determining a position where the failure occurred; and blocking the position where the failure occurred and connecting the distributed power source to the microgrid. ### Claim 8 (depends on 7) The failure management method according to claim 7, wherein the step of connecting the PCS of the ESS to the microgrid includes steps of: closing a DC-stage switch for interrupting a battery and an inverter of the ESS; closing an AC-stage switch for interrupting the inverter of the ESS and the microgrid; and closing the IGBT constituting the inverter. ### Claim 9 (depends on 7) The failure management method according to claim 7, wherein, in the step of determining the position where the failure has occurred, a trend of current change with the gradual increase of the voltage is compared with a trend of current change in a normal state, and if there is checked an increasing trend in which the trend of current change is significantly higher than the trend of current change in the normal state, it is determined that there is a failure in a line/load side. ### Claim 10 (depends on 7) The failure management method according to claim 7, wherein, in the step of determining the position where the failure has occurred, the current is gradually increased from 0 [A] to a level of 80% of a rated current that can be output to the microgrid for a specified period of time in order to gradually increase the voltage output from the ESS PCS.