This paper investigates the root causes of detrimental oscillations in the dc link voltage of an energy storage system using a dual dq controller, operating at a high-voltage ac grid with high reactance-resistance ratio. Dual dq controllers are recommended in the literature for power converters operating under unbalanced, fault, or reduced voltage conditions. They employ two separated rotating reference frames, one for the positive and one for the negative sequence. The causes of the oscillations are investigated both theoretically and by time-domain computer simulations. As a result of the simulations, the performance of two dual controllers used in the industry is compared. In the presence of exponentially decaying dc currents, the filtering techniques employed by the controllers affect differently the performance of the proportional-integral regulators and disturb the feed forwarding and dq decoupling schemes. Ultimately, this results in undesirable oscillations in the dc-link voltage. This paper sheds light on how a fundamental phenomenon of three-phase ac systems can critically affect the control of power electronic converters. It provides a valuable insight into a possible root cause of oscillations in large electrical system applications with a considerable power converter penetration, such as large industrial plants striving for reducing greenhouse gas emissions.

Understanding the Effects of Exponentially Decaying DC Currents on the Dual dq Control of Power Converters in Systems with High X/R / Dos Santos Mota, Daniel; Tedeschi, Elisabetta. - (2021), pp. 1-6. (Intervento presentato al convegno CPE-POWERENG 2021 tenutosi a Firenze nel 14th-16th July 2021) [10.1109/CPE-POWERENG50821.2021.9501204].

Understanding the Effects of Exponentially Decaying DC Currents on the Dual dq Control of Power Converters in Systems with High X/R

Tedeschi, Elisabetta
Ultimo
2021-01-01

Abstract

This paper investigates the root causes of detrimental oscillations in the dc link voltage of an energy storage system using a dual dq controller, operating at a high-voltage ac grid with high reactance-resistance ratio. Dual dq controllers are recommended in the literature for power converters operating under unbalanced, fault, or reduced voltage conditions. They employ two separated rotating reference frames, one for the positive and one for the negative sequence. The causes of the oscillations are investigated both theoretically and by time-domain computer simulations. As a result of the simulations, the performance of two dual controllers used in the industry is compared. In the presence of exponentially decaying dc currents, the filtering techniques employed by the controllers affect differently the performance of the proportional-integral regulators and disturb the feed forwarding and dq decoupling schemes. Ultimately, this results in undesirable oscillations in the dc-link voltage. This paper sheds light on how a fundamental phenomenon of three-phase ac systems can critically affect the control of power electronic converters. It provides a valuable insight into a possible root cause of oscillations in large electrical system applications with a considerable power converter penetration, such as large industrial plants striving for reducing greenhouse gas emissions.
2021
2021 IEEE 15th International Conference on Compatibility, Power Electronics and Power Engineering
Piscataway, New Jersey, United States
Institute of Electrical and Electronics Engineers Inc.
978-1-7281-8071-7
978-1-7281-8072-4
Dos Santos Mota, Daniel; Tedeschi, Elisabetta
Understanding the Effects of Exponentially Decaying DC Currents on the Dual dq Control of Power Converters in Systems with High X/R / Dos Santos Mota, Daniel; Tedeschi, Elisabetta. - (2021), pp. 1-6. (Intervento presentato al convegno CPE-POWERENG 2021 tenutosi a Firenze nel 14th-16th July 2021) [10.1109/CPE-POWERENG50821.2021.9501204].
File in questo prodotto:
File Dimensione Formato  
CPE_POWERENG_Final_Paper.pdf

accesso aperto

Tipologia: Post-print referato (Refereed author’s manuscript)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 722.79 kB
Formato Adobe PDF
722.79 kB Adobe PDF Visualizza/Apri
Understanding_the_Effects_of_Exponentially_Decaying_DC_Currents_on_the_Dual_dq_Control_of_Power_Converters_in_Systems_with_High_X_R.pdf

Solo gestori archivio

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 618.43 kB
Formato Adobe PDF
618.43 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/335684
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 1
social impact