Reactive Power Control Device and Reactive Power Control Method

Content Provider	The Lens
Abstract	A reactive power control device includes a limit value deriver and a command value adjuster. The limit value deriver derives a limit value of reactive power output, which is output by one or a plurality of power conversion devices, on the basis of a voltage detected by a voltage detector. The command value adjuster adjusts a reactive power command value for the one or plurality of power conversion devices on the basis of the limit value of reactive power output.
Related Links	https://www.lens.org/lens/patent/009-546-617-113-008/frontpage
Language	English
Publisher Date	2019-11-13
Access Restriction	Open
Alternative Title	Reaktive Leistungssteuerungsvorrichtung Und Reaktives Leistungssteuerungsverfahren Dispositif De Contrôle De Puissance Réactive Et Procédé De Contrôle De Puissance Réactive
Content Type	Text
Resource Type	Patent
Date Applied	2017-01-06
Agent	Awa Sweden Ab
Applicant	Toshiba Kk Toshiba Energy Systems & Solutions Corp
Application No.	17890628
Claim	A reactive power control device comprising: a limit value deriver configured to derive a limit value of reactive power output, which is output by one or a plurality of power conversion devices, on the basis of a voltage detected by a voltage detector; 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. 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 output 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. The reactive power control device according to claim 1 or 2, wherein the limit value derived by the limit value deriver includes 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. 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 the voltage detector, 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. The reactive power control device according to claim 3 or 4, 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. The reactive power control device according to any one of claims 1 to 5, 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. The reactive power control device according to any one of claims 1 to 5, 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 detected by the voltage detector, and derives the limit value on the basis of the voltage of the second point. The reactive power control device according to any one of claims 1 to 5, 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 detected by the voltage detector 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. The reactive power control device according to any one of claims 1 to 5, 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. The reactive power control device according to any one of claims 7 to 9, wherein the second point is a point corresponding to a connection point with a grid of an interconnection destination. The reactive power control device according to any one of claims 1 to 10, 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. A reactive power control method comprising the steps of: deriving a limit value of reactive power output, which is output by one or a plurality of power conversion devices, on the basis of a voltage detected by a voltage detector; 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 output.
CPC Classification	CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER;SYSTEMS FOR STORING ELECTRIC ENERGY SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES Reduction Of Greenhouse Gas [Ghg] Emissions; Related To Energy Generation; Transmission Or Distribution
Extended Family	009-546-617-113-008 141-499-322-404-058 175-987-177-502-079 086-858-236-621-936 023-515-569-821-362 002-419-130-219-859 004-321-487-503-788
Patent ID	3567690
Inventor/Author	Kawachi Shunsuke Mizutani Mami Tanno Tsutomu Hashimoto Tatsuya
IPC	H02J3/16 G05F1/70 H02J3/18
Status	Discontinued
Simple Family	009-546-617-113-008 141-499-322-404-058 175-987-177-502-079 086-858-236-621-936 023-515-569-821-362 002-419-130-219-859 004-321-487-503-788
CPC (with Group)	H02J3/16 G05F1/70 Y02E40/30 H02J3/18 H02J3/1842
Issuing Authority	United States Patent and Trademark Office (USPTO)
Kind	Patent Application Publication