AN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR

Purpose. Modern approaches of VAR compensation are: using compensators with stepped regulation, STATCOMs, active power filters. Recently, more attention is paid to VAR compensator’s design based on the direct AC / AC converters, which are called dynamic capacitors. Methodology. The dynamic capacitor...

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Autor principal:	S.K. Podnebennaya
Formato:	article
Lenguaje:	EN RU UK
Publicado:	National Technical University "Kharkiv Polytechnic Institute" 2015
Materias:	VAR compensation dynamic capacitor control system thin AC/AC converter bidirectional switch Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/7988515581034acb9710f4036358451f
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spelling	oai:doaj.org-article:7988515581034acb9710f4036358451f2021-12-02T17:53:12ZAN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR2074-272X2309-3404https://doaj.org/article/7988515581034acb9710f4036358451f2015-11-01T00:00:00Zhttp://eie.khpi.edu.ua/article/view/47429/48479https://doaj.org/toc/2074-272Xhttps://doaj.org/toc/2309-3404Purpose. Modern approaches of VAR compensation are: using compensators with stepped regulation, STATCOMs, active power filters. Recently, more attention is paid to VAR compensator’s design based on the direct AC / AC converters, which are called dynamic capacitors. Methodology. The dynamic capacitor (D-CAP) is the capacitor bank, which is connected to the mains through direct AC / AC buck converter. By varying the duty cycle of bidirectional switches, smooth control of reactive power can be achieved. However, in case of distorted mains voltage, D-CAP mains current will have a high THD. This is due to the fact that the D-CAP affects the frequency response of electric grid thus leading to the appearance of resonances. With non-sinusoidal mains voltage, capacitors are affected by harmonics. This reduces the reliability of the D-CAP, increasing the probability of their failure. To eliminate these drawbacks it is suggested to improve the D-CAP control system so that the input current of the dynamic capacitor is forced to be close to sinusoidal. This can be achieved if the duty cycle of the switching bi-directional switches is changed according to the proposed expression. Results. The research is done on a single-phase D-CAP with the proposed control system, its input current diagrams are shown. In contrast to the D-CAP with a constant duty cycle control, the resulting THD of its input current is much lower. Thus, the control system provides a form of the input current that is close to a sine wave. This reduces the influence of mains voltage harmonics on the D-CAP operation, increases its reliability and improves power quality. Originality. The proposed D-CAP control system ensures reliable operation with non-sinusoidal mains voltage. Practical value. Application of D-CAPs with the proposed control system allows for improved energy efficiency of electrical mains by providing VAR compensation and improving power quality.S.K. PodnebennayaNational Technical University "Kharkiv Polytechnic Institute"articleVAR compensationdynamic capacitorcontrol systemthin AC/AC converterbidirectional switchElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENRUUKElectrical engineering & Electromechanics, Iss 5, Pp 59-62 (2015)
institution	DOAJ
collection	DOAJ
language	EN RU UK
topic	VAR compensation dynamic capacitor control system thin AC/AC converter bidirectional switch Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	VAR compensation dynamic capacitor control system thin AC/AC converter bidirectional switch Electrical engineering. Electronics. Nuclear engineering TK1-9971 S.K. Podnebennaya AN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR
description	Purpose. Modern approaches of VAR compensation are: using compensators with stepped regulation, STATCOMs, active power filters. Recently, more attention is paid to VAR compensator’s design based on the direct AC / AC converters, which are called dynamic capacitors. Methodology. The dynamic capacitor (D-CAP) is the capacitor bank, which is connected to the mains through direct AC / AC buck converter. By varying the duty cycle of bidirectional switches, smooth control of reactive power can be achieved. However, in case of distorted mains voltage, D-CAP mains current will have a high THD. This is due to the fact that the D-CAP affects the frequency response of electric grid thus leading to the appearance of resonances. With non-sinusoidal mains voltage, capacitors are affected by harmonics. This reduces the reliability of the D-CAP, increasing the probability of their failure. To eliminate these drawbacks it is suggested to improve the D-CAP control system so that the input current of the dynamic capacitor is forced to be close to sinusoidal. This can be achieved if the duty cycle of the switching bi-directional switches is changed according to the proposed expression. Results. The research is done on a single-phase D-CAP with the proposed control system, its input current diagrams are shown. In contrast to the D-CAP with a constant duty cycle control, the resulting THD of its input current is much lower. Thus, the control system provides a form of the input current that is close to a sine wave. This reduces the influence of mains voltage harmonics on the D-CAP operation, increases its reliability and improves power quality. Originality. The proposed D-CAP control system ensures reliable operation with non-sinusoidal mains voltage. Practical value. Application of D-CAPs with the proposed control system allows for improved energy efficiency of electrical mains by providing VAR compensation and improving power quality.
format	article
author	S.K. Podnebennaya
author_facet	S.K. Podnebennaya
author_sort	S.K. Podnebennaya
title	AN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR
title_short	AN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR
title_full	AN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR
title_fullStr	AN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR
title_full_unstemmed	AN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR
title_sort	improved control algorithm for «dynamic capacitor» var compensator
publisher	National Technical University "Kharkiv Polytechnic Institute"
publishDate	2015
url	https://doaj.org/article/7988515581034acb9710f4036358451f
work_keys_str_mv	AT skpodnebennaya animprovedcontrolalgorithmfordynamiccapacitorvarcompensator AT skpodnebennaya improvedcontrolalgorithmfordynamiccapacitorvarcompensator
_version_	1718379175175258112

AN IMPROVED CONTROL ALGORITHM FOR «DYNAMIC CAPACITOR» VAR COMPENSATOR

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