Multiple-tuned filter design method for HVDC system

Patent metadata

Field	Value
Publication number	US-9973003-B2
Application number	US-201514815740-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Oct 30, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A method of designing a multiple-tuned filter (MTF) of a high voltage direct current (HVDC) system is provided. The method includes selecting an input parameter for the MTF, setting a resonance frequency of the MTF, calculating values of inductance (L) and capacitance (C) which are filter parameters of the MTF on the basis of the input parameter and the resonance frequency, combining a value of resistance (R) with the filter parameters and calculating a price according to the combination, and storing the combined values of R, L, and C when the calculated price falls within a predetermined price range.

First claim

What is claimed is:

1. A method of designing a multiple-tuned filter (MTF) of a high voltage direct current (HVDC) system, the method comprising:
selecting an input parameter for the MTF;
setting a resonance frequency of the MTF;
calculating values of a inductance (L) and a capacitance (C) which are filter parameters of the MTF on the basis of the input parameter and the resonance frequency;
combining a value of a resistance (R) with the filter parameters and calculating a price according to the combination; and
storing the combined values of R, L, and C when the calculated price falls within a predetermined price range.

2. The method of claim 1 , further comprising resetting the resonance frequency when the calculated price falls outside the predetermined price range.

3. The method of claim 2 , further comprising recalculating the values of L and C on the basis of the reset resonance frequency after resetting the resonance frequency.

4. The method of claim 1 , further comprising, after the storing of the combined values of R, L, and C:
calculating an individual harmonic component or total harmonic distortion of the values of R, L, and C; and
determining whether the calculated individual harmonic component or total harmonic distortion satisfies an allowance value.

5. The method of claim 4 , further comprising connecting a load or system on the basis of the combined value of R when the calculated individual harmonic component or total harmonic distortion satisfies the allowance value.

6. The method of claim 4 , further comprising changing a combination of the combined values of R, L, and C when the calculated individual harmonic component or total harmonic distortion does not satisfy the allowance value.

7. The method of claim 1 , further comprising evaluating suitability of the combined values of R, L, and C using a first objective function for a price of each of elements corresponding to the combined values of R, L, and C and a second objective function for representing a performance loss of the element.

8. The method of claim 7 , wherein the evaluating of the suitability of the combined values of R, L, and C comprises:
calculating an individual harmonic component or total harmonic distortion of the values of R, L, and C; and
determining whether the calculated individual harmonic component or total harmonic distortion satisfies an allowance value.

9. The method of claim 8 , wherein the evaluating of the suitability of the combined values of R, L, and C comprises assigning a predetermined weight to the first or second objective function and then summing the first objective function and the second objective function to calculate a single objective function.

10. The method of claim 9 , wherein, when a value of the determined single objective function falls within a predetermined threshold range, design of a filter including the combination of the value of R, L, and C is allowed.

Assignees

• Lsis Co Ltd

Inventors

• Chyun Yi Kyung

Classifications

• H03H7/1758

  Series LC in shunt or branch path (H03H7/1791 takes precedence) · CPC title

• H03H7/1716

  Comprising foot-point elements · CPC title

• H02J3/36 Primary

  Arrangements for transfer of electric power between AC networks via high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links · CPC title

• H03H7/1791

  Combined LC in shunt or branch path · CPC title

• H03H7/1775

  Parallel LC in shunt or branch path (H03H7/1791 takes precedence) · CPC title