Abstract
In this paper a control strategy for the parallel operation of three-phase inverters in a modular online uninterruptable power supply (UPS) system is proposed. The UPS system is composed of a number for DC/ACs with LC filter connected to the same AC critical bus and an AC/DC that forms the DC bus. The proposed control is designated in two layers, individual layer and recovery layer. In individual layer, virtual impedance concept is employed in order to achieve active power sharing while individual reactive power is calculated to modify output voltage phases to achieve reactive power sharing among different modules. Recovery layer is mainly responsible for guaranteeing synchronization capability with the utility and voltage recovery. With the proposed control, improved voltage transient performance can be achieved and also DC/AC modules are allowed to be plugged in and out flexibly while controlling the AC critical bus voltage. Detailed control architecture, regarding individual layer and recovery layer, are presented in this paper. Also an experimental setup was built to validate the proposed control approach under several scenarios-case study.
| Original language | English |
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| Title of host publication | Proceedings of the 2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia) |
| Number of pages | 7 |
| Publisher | IEEE Press |
| Publication date | 2015 |
| Pages | 659 - 666 |
| DOIs | |
| Publication status | Published - 2015 |
| Event | 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia 2015) - Seoul, Korea, Republic of Duration: 1 Jun 2015 → 5 Jun 2015 |
Conference
| Conference | 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia 2015) |
|---|---|
| Country/Territory | Korea, Republic of |
| City | Seoul |
| Period | 01/06/2015 → 05/06/2015 |
Keywords
- Modular UPS system
- Voltage restoration
- Plug’n’Play