Power system analysis support system, analysis support apparatus for power system, analysis support method for power system, and measuring device for power system

• US 10,024,894 B2
• Filed: 09/22/2014
• Issued: 07/17/2018
• Est. Priority Date: 02/14/2014
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Tsunedomi, Kunihiko, Watanabe, Masahiro, Oonishi, Tsukasa
• Primary Examiner(s): NGUYEN, LAM S
• Application Number:
  US15/114,420
• Publication Number:
  US 20160349296A1
• Time in Patent Office: 1,394 Days
• Field of Search: 323340, 307 31, 370250, 703 16, 702 62
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: G01R 21/003 Measuring reactive component
• CPC Class Codes: G01R 21/1331 Measuring real or reactive component, measuring apparent energy
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 13/00001 characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
• CPC Class Codes: H02J 13/00028 involving the use of Internet protocols
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: Y04S 10/40 Display of information, e.g. of data or controls

Abstract

To provide a power system analysis support system in which the amount of data to be sent from a measuring device to an analysis support apparatus can be reduced. A measuring device includes a measuring unit which performs measurement related to a power system, a storage unit which stores measurement values measured by the measuring unit, a parameter generator which generates a predetermined parameter indicating a probability density function of the measurement value from the plurality of measurement values stored in the storage unit, and a communication unit which sends the predetermined parameter generated by the parameter generator to an analysis support apparatus. The analysis support apparatus includes a communication unit which receives the predetermined parameter from the measuring device, and a probability density function generator which generates a probability density function of the measurement value from the received predetermined parameter.

Claims

1. A power system analysis support system which supports analysis of a power system, comprising:

a measuring device which performs measurement related to the power system; and

an analysis support apparatus which is connected to the measuring device to communicate therewith,

wherein the measuring device includes

a measuring unit which performs measurement related to the power system,

a storage unit which stores measurement values measured by the measuring unit,

a parameter generator which generates a predetermined parameter indicating a probability density function of the measurement value from the plurality of measurement values stored in the storage unit, and

a communication unit which sends the predetermined parameter generated by the parameter generator to the analysis support apparatus, and

the analysis support apparatus includes

a communication unit which receives the predetermined parameter from the measuring device, and

a probability density function generator which generates a probability density function of the measurement value from the received predetermined parameter.

2. The power system analysis support system according to claim 1,

wherein the measurement value includes one or more of a voltage, a current, active power, and reactive power of the power system.

3. The power system analysis support system according to claim 2,

wherein the storage unit stores the measurement values and measurement conditions in association with each other.

4. The power system analysis support system according to claim 3,

wherein the power system is provided with an automatic voltage controller capable of switching a transformation ratio with a tap, and

the storage unit stores, as the measurement condition, a tap position of the automatic voltage controller in association with the measurement value.

5. The power system analysis support system according to claim 3,

wherein the power system is provided with a switch for separating a part of the power system, and

the storage unit stores, as the measurement condition, a state of the switch in association with the measurement value.

6. The power system analysis support system according to claim 3,

wherein the parameter generator generates a first-order center moment, a second-order center moment, and a third- or higher-order center moment as the predetermined moment.

7. The power system analysis support system according to claim 6,

wherein the parameter generator can change the maximum order of a center moment generated as the predetermined parameter.

8. The power system analysis support system according to claim 7, further comprising:

an order setting unit which sets the maximum order according to a measurement environment in the parameter generator.

9. An analysis support apparatus which supports analysis of a power system, comprising:

a communication unit which acquires data from a measuring device which performs measurement related to a power system; and

a computing unit which analyzes the data acquired by the communication unit,

wherein the measuring device performs measurement related to the power system, stores measurement values, and generates a predetermined parameter indicating a probability density function of the measurement value from the stored plurality of measurement values, and

the computing unit generates a probability density function of the measurement value from the predetermined parameter acquired from the measuring device, and calculates and stores a coefficient of the probability density function.

10. An analysis support method for a power system for supporting analysis of a power system using an analysis support apparatus,

wherein the analysis support apparatus includes a communication unit which acquires data from a measuring device which performs measurement related to the power system, and a computing unit which analyzes the data acquired by the communication unit,

the measuring device performs measurement related to the power system, stores measurement values, and generates, as the data, a predetermined parameter indicating a probability density function of the measurement value from the stored plurality of measurement values, and

the analysis support apparatus acquires the predetermined parameter from the measuring device, generates a probability density function of the measurement value from the acquired predetermined parameter, and calculates and stores a coefficient of the probability density function.