Abstract
During the operation of a three line ac link in parallel with a ac-dc-ac link system that employs Back-to-Back (B2B)Medium Voltage Modular Multilevel Converters (MMC), a path for the low frequency zero sequence currents is shown to exist. Apart from causing additional losses, these currents can result in limitations on power capacity. A detailed analysis on the influence of cell capacitance, arm inductance and link conductor length on the circulating zero sequence currents and the means to mitigate them through a simulated control strategy is investigated. The simulations show that the dc link employing B2B-MMC can successfully operate in parallel with ac link without transformer isolation by controlling the zero sequence currents.
| Original language | English |
|---|---|
| Title of host publication | ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia |
| Publisher | IEEE |
| Pages | 837-842 |
| Number of pages | 6 |
| ISBN (Electronic) | 978-89-5708-313-0 |
| ISBN (Print) | 978-1-7281-1612-9 |
| Publication status | Published - 2019 |
| Event | 10th International Conference on Power Electronics - ECCE Asia, ICPE 2019 - ECCE Asia: 10th International Conference on Power Electronics - Busan, Korea, Republic of Duration: 27 May 2019 → 30 May 2019 Conference number: 10th |
Conference
| Conference | 10th International Conference on Power Electronics - ECCE Asia, ICPE 2019 - ECCE Asia |
|---|---|
| Country/Territory | Korea, Republic of |
| City | Busan |
| Period | 27/05/19 → 30/05/19 |
Keywords
- AC/DC converter
- Circulating current control
- Common dc and ac buses
- Common mode current
- Parallel connected
- Zero-sequence circulating current