Reactive Power Impacts on LCL Filter Capacitor Lifetime in Grid-Connected Inverter
With the increasing penetration of renewable power, its reliability and cost-effective production are becoming more important. A filter is inserted between the grid-connected inverter and the power grid to reduce the PWM switching harmonics, which may become a fragile part seen from the power electr...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2020-01-01
|
| Series: | IEEE Open Journal of Power Electronics |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9086063/ |
| _version_ | 1828891603437092864 |
|---|---|
| author | Dao Zhou Huai Wang Frede Blaabjerg |
| author_facet | Dao Zhou Huai Wang Frede Blaabjerg |
| author_sort | Dao Zhou |
| collection | DOAJ |
| description | With the increasing penetration of renewable power, its reliability and cost-effective production are becoming more important. A filter is inserted between the grid-connected inverter and the power grid to reduce the PWM switching harmonics, which may become a fragile part seen from the power electronics converter perspective. As the grid-connected inverter is typically designed with additional reactive power capability, this paper tries to investigate the additional stresses of the filter capacitor introduced by the reactive power injection. According to an electro-thermal stress evaluation, the time-to-failure distribution of a single LCL filter capacitor is investigated in detail. Moreover, the increasing equivalent series resistance along with the operational period is taken into account. Aiming towards a system-level reliability analysis, a Weibull distribution based reliability of an individual capacitor can be linked to the reliability of a capacitor bank by using a reliability block diagram. A case study of a 2 MW wind power converter shows that the lifetime is significantly reduced from the individual capacitor to the capacitor bank. Besides, over-excited reactive power injection further reduces the lifetime of the LCL filter capacitors. |
| first_indexed | 2024-12-13T13:20:03Z |
| format | Article |
| id | doaj.art-fd47f54c91704d599bbeb8bff88a524b |
| institution | Directory Open Access Journal |
| issn | 2644-1314 |
| language | English |
| last_indexed | 2024-12-13T13:20:03Z |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Power Electronics |
| spelling | doaj.art-fd47f54c91704d599bbeb8bff88a524b2022-12-21T23:44:25ZengIEEEIEEE Open Journal of Power Electronics2644-13142020-01-01113914810.1109/OJPEL.2020.29922799086063Reactive Power Impacts on LCL Filter Capacitor Lifetime in Grid-Connected InverterDao Zhou0https://orcid.org/0000-0001-9531-4309Huai Wang1https://orcid.org/0000-0002-5404-3140Frede Blaabjerg2https://orcid.org/0000-0001-8311-7412Department of Energy Technology, Aalborg University, Aalborg, DenmarkDepartment of Energy Technology, Aalborg University, Aalborg, DenmarkDepartment of Energy Technology, Aalborg University, Aalborg, DenmarkWith the increasing penetration of renewable power, its reliability and cost-effective production are becoming more important. A filter is inserted between the grid-connected inverter and the power grid to reduce the PWM switching harmonics, which may become a fragile part seen from the power electronics converter perspective. As the grid-connected inverter is typically designed with additional reactive power capability, this paper tries to investigate the additional stresses of the filter capacitor introduced by the reactive power injection. According to an electro-thermal stress evaluation, the time-to-failure distribution of a single LCL filter capacitor is investigated in detail. Moreover, the increasing equivalent series resistance along with the operational period is taken into account. Aiming towards a system-level reliability analysis, a Weibull distribution based reliability of an individual capacitor can be linked to the reliability of a capacitor bank by using a reliability block diagram. A case study of a 2 MW wind power converter shows that the lifetime is significantly reduced from the individual capacitor to the capacitor bank. Besides, over-excited reactive power injection further reduces the lifetime of the LCL filter capacitors.https://ieeexplore.ieee.org/document/9086063/Power capacitorslifetime estimationreactive powerdegradation |
| spellingShingle | Dao Zhou Huai Wang Frede Blaabjerg Reactive Power Impacts on LCL Filter Capacitor Lifetime in Grid-Connected Inverter IEEE Open Journal of Power Electronics Power capacitors lifetime estimation reactive power degradation |
| title | Reactive Power Impacts on LCL Filter Capacitor Lifetime in Grid-Connected Inverter |
| title_full | Reactive Power Impacts on LCL Filter Capacitor Lifetime in Grid-Connected Inverter |
| title_fullStr | Reactive Power Impacts on LCL Filter Capacitor Lifetime in Grid-Connected Inverter |
| title_full_unstemmed | Reactive Power Impacts on LCL Filter Capacitor Lifetime in Grid-Connected Inverter |
| title_short | Reactive Power Impacts on LCL Filter Capacitor Lifetime in Grid-Connected Inverter |
| title_sort | reactive power impacts on lcl filter capacitor lifetime in grid connected inverter |
| topic | Power capacitors lifetime estimation reactive power degradation |
| url | https://ieeexplore.ieee.org/document/9086063/ |
| work_keys_str_mv | AT daozhou reactivepowerimpactsonlclfiltercapacitorlifetimeingridconnectedinverter AT huaiwang reactivepowerimpactsonlclfiltercapacitorlifetimeingridconnectedinverter AT fredeblaabjerg reactivepowerimpactsonlclfiltercapacitorlifetimeingridconnectedinverter |