Title:
POWER SYSTEM CHARACTERISTIC ANALYZER
Document Type and Number:
WIPO Patent Application WO/2021/014580
Kind Code:
A1
Abstract:
According to an embodiment of the present invention, provided is a power system characteristic analyzer that converts the power of a distributed power supply to the AC power corresponding to a power system connected to an infinite bus-line power system and supplies the converted AC power to the power system, thereby being used together with a power conversion device for interconnecting the distributed power supply with the power system, and analyzing the system characteristics of the power system. The power system characteristic analyzer is provided with: a data collection unit that periodically obtains active power values at the interconnection point of the power conversion device with the power system, reactive power values at the interconnection point, and voltage values at the interconnection point, thereby collecting a data set comprising the active power values, the reactive power values, and the voltage values periodically obtained during a predetermined period; an estimated value calculation unit that uses a Kalman filter dealing with a non-linear equation, thereby calculating, on the basis of the active power values, the reactive power values, and the voltage values included in the data set, an estimated value of the resistive component of the system impedance of the power system, an estimated value of the reactive component of the system impedance, and estimated values of the voltage values of the infinite bus-line power system; a reactive power calculation unit that calculates, on the basis of the estimated value of the resistive component of the system impedance, the estimated value of the reactive component of the system impedance, and the estimated values of the voltage values of the infinite bus-line power system, a reactive power supplied to the power system; a power factor angle calculation unit that calculates power factor angles on the basis of the reactive power; and a function calculation unit that calculates a function for linear-approximating or curve-approximating the power factor angles corresponding to the respective active power values, reactive power values, and voltage values in the data set. This provides a power system characteristic analyzer capable of estimating/analyzing, for example, a power factor for injecting an appropriate reactive power.
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Inventors:
SHIGEMASA TAKASHI (JP)
MITSUGI YASUAKI (JP)
HIRA KATSUYA (JP)
MITSUGI YASUAKI (JP)
HIRA KATSUYA (JP)
Application Number:
PCT/JP2019/028887
Publication Date:
January 28, 2021
Filing Date:
July 23, 2019
Export Citation:
Assignee:
TOSHIBA MITSUBISHI ELEC IND (JP)
International Classes:
H02J3/00; H02J3/18; H02J3/38; H02J13/00
Foreign References:
| JP2017221040A | 2017-12-14 | |||
| JP2017063525A | 2017-03-30 | |||
| JP2017189028A | 2017-10-12 | |||
| JP2007300784A | 2007-11-15 |
Attorney, Agent or Firm:
HYUGAJI, Masahiko et al. (JP)
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