# US 2019/0296551 A1 · Reactive power control device and reactive power control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0296551 A1 - Document ID: US20190296551A1 - Status: Published application - Kind: A1 - Application number: 16/426,559 - Filed: 2019-05-30 - Published: 2019-09-26 - Earliest claimed: 2017-01-06 - Assignees: Kabushiki Kaisha Toshiba; Toshiba Energy Systems & Solutions Corporation - Applicants: Kabushiki Kaisha Toshiba; Toshiba Energy Systems & Solutions Corporation - Inventors: Shunsuke KAWACHI; Mami Mizutani; Tsutomu Tanno; Tatsuya Hashimoto - Web page: https://patentgrep.com/patent/US20190296551A1 ## CPC - H02J 3/18: Arrangements for adjusting, eliminating or compensating reactive power in networks - G05F 1/70: Regulating power factor; Regulating reactive current or power - H02J 3/16: by adjustment of reactive power - H02J 3/1842: having reactive elements actively controlled by bridge converters, e.g. active filters or static compensators [STATCOM] - Y02E 40/30: Reactive power compensation - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A reactive power control device includes a limit value deriver configured to derive a limit value of reactive power, which is output by one or a plurality of power conversion devices determined for system stabilization and control of a system voltage, on the basis of a voltage of a point other than a voltage control target, and a command value adjuster configured to adjust a reactive power command value for the one or plurality of power conversion devices on the basis of the limit value derived by the limit value deriver. ## Claims ### Claim 1 A reactive power control device comprising: a limit value deriver configured to derive a limit value of reactive power, which is output by one or a plurality of power conversion devices determined for system stabilization and control of a system voltage, on the basis of a voltage of a point other than a voltage control target; and a command value adjuster configured to adjust a reactive power command value for the one or plurality of power conversion devices on the basis of the limit value derived by the limit value deriver. ### Claim 2 (depends on 1) The reactive power control device according to claim 1, wherein, when a reactive power command value received from an external control device is out of an allowable range of the reactive power prescribed based on the limit value derived by the limit value deriver, the command value adjuster limits the reactive power command value to be within the allowable range. ### Claim 3 (depends on 1) The reactive power control device according to claim 1, wherein the limit value is derived by the limit value deriver from any one of an upper limit value and a lower limit value of an allowable range of a voltage at an output terminal of the one or plurality of power conversion devices. ### Claim 4 (depends on 3) The reactive power control device according to claim 3, wherein the limit value deriver determines the upper limit value or the lower limit value of the allowable range of the voltage on the basis of a voltage value acquired from a voltage detector at the point other than the voltage control target, and derives the limit value on the basis of a difference between the voltage value acquired from the voltage detector and the determined upper limit value or lower limit value. ### Claim 5 (depends on 3) The reactive power control device according to claim 3, wherein the limit value deriver determines the upper limit value or the lower limit value of the allowable range of the voltage on the basis of a voltage value on a bus or a wiring in the reactive power control device. ### Claim 6 (depends on 1) The reactive power control device according to claim 1, wherein the limit value deriver derives the limit value on the basis of a voltage value of a grid connection point of the reactive power control device and an allowable value of the voltage of the bus, the wiring, or the output terminal of the power conversion device in the reactive power control device. ### Claim 7 (depends on 1) The reactive power control device according to claim 1, wherein the limit value deriver derives an estimated value of a voltage of a second point on the basis of a voltage of a first point other than the voltage control target, and derives the limit value on the basis of the voltage of the second point. ### Claim 8 (depends on 1) The reactive power control device according to claim 1, wherein the limit value deriver derives an estimated value of a voltage of a second point on the basis of a voltage of a first point other than the voltage control target and a reactive power amount of the one or plurality of power conversion devices, and derives the limit value on the basis of the estimated value of the voltage of the second point. ### Claim 9 (depends on 1) The reactive power control device according to claim 1, wherein the limit value deriver derives a first limit value on the basis of an allowable value of the voltage of the bus, the wiring, or the output terminal of the power conversion device in the reactive power control device or a voltage of a first point at the output terminal of the power conversion device, derives an estimated value of a voltage of a second point on the basis of at least the voltage of the first point and a reactive power amount of the one or plurality of power conversion devices, derives a second limit value on the basis of the estimated value of the voltage of the second point, and derives the limit value from the first limit value or the second limit value. ### Claim 10 (depends on 1) The reactive power control device according to claim 1, wherein the second point is a point corresponding to a connection point with a grid of an interconnection destination. ### Claim 11 (depends on 1) The reactive power control device according to claim 1, wherein the limit value deriver derives a limit value of reactive power output of the one or plurality of power conversion devices from the reactive power command value for the one or plurality of power conversion devices or an output value of reactive power of the one or plurality of power conversion devices. ### Claim 12 A reactive power control method comprising the steps of: deriving a limit value of reactive power, which is output by one or a plurality of power conversion devices determined for system stabilization and control of a system voltage, on the basis of a voltage of a point other than a voltage control target; and adjusting a reactive power command value for the one or plurality of power conversion devices on the basis of the limit value of the reactive power.