# US 10,122,291 B2 · Redundant control device and method of HVDC system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,291 B2 - Document ID: US10122291B2 - Status: Granted - Kind: B2 - Application number: 15/057,353 - Filed: 2016-03-01 - Published: 2016-09-15 - Granted: 2018-11-06 - Earliest claimed: 2015-03-10 - Assignees: Lsis Co., Ltd. - Applicants: Lsis Co., Ltd. - Inventors: Seung Hun Lee; Jong Bae Kim; Eung Soo Kim - Web page: https://patentgrep.com/patent/US10122291B2 ## CPC - H02M 5/42: by static converters - G05B 9/03: with multiple-channel loop, i.e. redundant control systems - H02H 1/0061: {concerning transmission of signals (transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26)} - H02H 3/08: responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04) - H02H 7/261: {involving signal transmission between at least two stations (transmission of signals in general H02H1/0061)} - H02H 7/263: {involving transmissions of measured values (comparison of currents or voltages using pilot wires H02H3/30)} - H02H 7/30: Staggered disconnection - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) - 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) ## Abstract A redundant control device of a high voltage direct current (HVDC) transmission system is provided. The redundant control device includes a first system and a second system that performs a function corresponding to that of the first system; and a first change over logic (COL) and a second COL that determine whether to switch between the first system and the system, wherein there are optical communication modules between the first system and the first COL, between the first COL and the second COL, and between the second system and the second COL to transmit and receive data, and the first COL and the second COL includes a monitoring control unit that checks a connection or wiring state of the optical communication modules and validity of transmission data. ## Claims ### Claim 1 A redundant control device of a high voltage direct current (HVDC) transmission system, the redundant control device comprising: a first system and a second system that performs a function corresponding to that of the first system; and a first change over logic (COL) and a second COL that determine whether to switch between the first system and the second system, wherein there are optical communication modules between the first system and the first COL, between the first COL and the second COL, and between the second system and the second COL to transmit and receive data, wherein the first COL and the second COL comprise a monitoring control unit that checks a connection or wiring state of the optical communication modules and validity of transmission data, and wherein the first COL controls the first control module, the second COL controls the second control module, and according to states of the first system and the second system, the first COL controls the first control module and the second control module or the second COL controls the first control module and the second control module. ### Claim 2 (depends on 1) The redundant control device according to claim 1, wherein the first COL comprises a system control unit that checks current states of the first system and the first COL and delivers a command to stop their operations when malfunction is found, a COL control unit that exchanges data with the second COL, checks whether there is an error, and transmits current states of the first system and the first COL to the second COL, and a command control unit that delivers a control command to the first control module according to a state of the first COL. ### Claim 3 (depends on 1) The redundant control device according to claim 1, wherein there are optical communication modules between the first COL and the first control module and between the second COL and the second control module to transmit and receive data.