POWER GRID FREQUENCY FLEXIBLE OPERATION SYSTEM AND METHOD USING THE SAME

• US 20160036341A1
• Filed: 07/08/2015
• Published: 02/04/2016
• Est. Priority Date: 07/31/2014
• Status: Active Grant

• Current Assignee: Korea University Research and Business Foundation (Korea University)
• Original Assignee: Korea University Research and Business Foundation (Korea University)
• Inventors: JANG, Gilsoo, CHO, Yunsung, SUH, Jaewan
• Granted Patent: US 10,116,238 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• CPC Class Codes: H02M 5/44 using discharge tubes or semiconductor devices to convert the intermediate dc into ac
• CPC Class Codes: H02M 7/7575 for high voltage direct transmission link
• CPC Class Codes: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

A power grid frequency flexible operation system is provided. The system comprises a generating unit, which includes a base-load unit and a peak-load unit; a high voltage direct-current (HVDC) transmission unit, which transmits the power generated in the generating unit as direct current (DC) power; and a load, which is supplied with the power generated by the generating unit; wherein the high-voltage direct current (HVDC) transmission unit comprises a converter, which transforms to direct current (DC) power, alternating current (AC) power generated in the generating unit and having a first frequency variation allowance range; an inverter, which is connected to the converter and transforms the direct current (DC) power to alternating current (AC) power having a second frequency variation allowance range, wherein the first frequency variation allowance range is larger than the second frequency variation allowance range.

Claims

1. A power grid frequency flexible operation system, comprising:

a generating unit, which includes a base-load unit and a peak-load unit;

a high voltage direct-current (HVDC) transmission unit, which transmits the power generated in the generating unit as direct current (DC) power; and

a load, which is supplied with the power generated by the generating unit,

wherein the high-voltage direct current (HVDC) transmission unit comprises;

a converter, which transforms, to direct current (DC) power, alternating current (AC) power generated in the generating unit and having a first frequency variation allowance range;

an inverter, which is connected to the converter and transforms the direct current (DC) power to alternating current (AC) power having a second frequency variation allowance range, and

wherein the first frequency variation allowance range is larger than the second frequency variation allowance range.

2. The power grid frequency flexible operation system according to claim 1, wherein an output of the inverter supplies the alternating current (AC) power by connecting with the load.

3. The power grid frequency flexible operation system according to claim 1, wherein the high-voltage direct current (HVDC) transmission unit is a bipolar HVDC transmission unit.

4. The power grid frequency flexible operation system according to claim 3, wherein the high-voltage direct current (HVDC) transmission unit further comprises a circuit breaker.

5. The power grid frequency flexible operation system according to claim 4, wherein the high-voltage direct current (HVDC) transmission unit further comprises a harmonic filter.

6. A power grid frequency flexible operation method comprising:

step (a) of supplying, to a first load, alternating current (AC) power received from a generating unit and having a first frequency variation allowance range;

step (b) of transforming the alternating current (AC) power having the first frequency variation allowance range to alternating current (AC) power having a second frequency variation allowance range; and

step (c) of supplying, to a second load, the alternating current (AC) power having the second frequency variation allowance range,

wherein the first frequency variation allowance range is larger than the second frequency variation allowance range.

7. The power grid frequency flexible operation method according to claim 6, wherein the step (b) comprises:

a step of transforming, to direct current (DC) power, the alternating current (AC) power having the first frequency variation allowance range; and

a step of transforming the direct current (DC) power to the alternating current (AC) power having the second frequency variation allowance range.