Method for designing multiple tuned filter in high voltage direct current system

Patent metadata

Field	Value
Publication number	US-9953119-B2
Application number	US-201615163497-A
Country	US
Kind code	B2
Filing date	May 24, 2016
Priority date	Jul 30, 2015
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A method for designing a multiple tuned filter (MTF) in a high voltage direct current (HVDC) system includes setting an input parameter constituting the MTF; setting a resonance frequency of the MTF; extracting at least one LC combination case constituting the MTF on the basis of the input parameter and the resonance frequency; performing optimization for harmonic reduction on the LC combination case; and extracting an LC combination case determined based on a result obtained by performing the optimization.

First claim

What is claimed is:

1. A method for designing a multiple tuned filter (MTF) in a high voltage direct current (HVDC) system, the method comprising:
setting an input parameter corresponding to the MTF, using a microprocessor;
setting a resonance frequency of the MTF;
extracting at least one LC combination case constituting the MTF on a basis of the input parameter and the resonance frequency;
performing optimization for harmonic reduction on the LC combination case by computing a first objective function having a total harmonic distortion (THD) as a minimum, and computing a second objective function having a total demand distortion of current (TDD) as a minimum; and
extracting an LC combination case determined based on a result of performing the optimization, such that the extracting of the LC combination case is based on the first objective function and the second objective function.

2. The method according to claim 1 , wherein the extracting of the LC combination case comprises:
respectively applying preset weighted values to the computed first and second objective functions; and
extracting the LC combination case having a minimum value according to the first and second objective functions to which the respective weighted values are applied.

3. The method according to claim 2 , wherein the weighted values comprise a first weighted value for a harmonic voltage regulation value applied to the first objective function and a second weighted value for a harmonic current allowable level applied to the second objective function.

4. The method according to claim 1 , further comprising performing compatibility evaluation on the extracted LC combination case.

5. The method according to claim 1 , further comprising selecting the first objective function and the second objective function, and setting a limiting condition to be applied to each of the first and second objective functions.

6. The method according to claim 5 , wherein the limiting condition comprises a reactive power demand of the MPF or price information on each of L and C, which constitute the MPF.

7. The method according to claim 5 , wherein the limiting condition comprises a reactive power demand of the MPF or loss information on each of L and C, which constitute the MPF.

8. The method according to claim 1 , further comprising combining a value of a resistor (R) with the LC combination case determined based on the result of performing the optimization.

Assignees

• Lsis Co Ltd

Inventors

• Chyun Yi Kyung

Classifications

• G06F30/30 Primary

  Circuit design · CPC title

• H03H7/01 Primary

  Frequency selective two-port networks · CPC title

• H02J2003/365

  Reducing harmonics or oscillations in HVDC · CPC title

• H03H2007/013

  Notch or bandstop filters · CPC title

• H02J3/36

  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