Abstract
In order to attenuate PWM harmonics effectively and reduce filter cost and volume, LCL-LC filter is proposed using a combination of LCL filter and an LC series resonant
part. Compared with LCL filter, LCL-LC filter is characterized with decreased total inductance and better switch-frequency harmonics attenuation ability, but the resonant problem affects the system stability remarkably. In this paper, active damping based on the capacitor voltage feedback is proposed using the concept of the equivalent virtual impedance in parallel with the capacitor. With the consideration of system delay, this paper presents a systematic design method for the LCL-LC filtered grid-connected photovoltaic (PV) system. With this method, controller parameters and the active damping feedback coefficient are easily obtained by specifying the system stability and dynamic performance indices, and it is more convenient to optimize the system performance according to the predefined satisfactory region. Finally, the simulation results are presented to validate the proposed design method and control scheme.
part. Compared with LCL filter, LCL-LC filter is characterized with decreased total inductance and better switch-frequency harmonics attenuation ability, but the resonant problem affects the system stability remarkably. In this paper, active damping based on the capacitor voltage feedback is proposed using the concept of the equivalent virtual impedance in parallel with the capacitor. With the consideration of system delay, this paper presents a systematic design method for the LCL-LC filtered grid-connected photovoltaic (PV) system. With this method, controller parameters and the active damping feedback coefficient are easily obtained by specifying the system stability and dynamic performance indices, and it is more convenient to optimize the system performance according to the predefined satisfactory region. Finally, the simulation results are presented to validate the proposed design method and control scheme.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of 8th IEEE International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia), 2016 |
| Number of pages | 6 |
| Publisher | IEEE Press |
| Publication date | May 2016 |
| ISBN (Electronic) | 978-1-5090-1210-7 |
| DOIs | |
| Publication status | Published - May 2016 |
| Event | 8th IEEE International Power Electronics and Motion Control Conference, IPEMC-ECCE Asia 2016 - Hefei, China Duration: 22 May 2016 → 26 May 2016 |
Conference
| Conference | 8th IEEE International Power Electronics and Motion Control Conference, IPEMC-ECCE Asia 2016 |
|---|---|
| Country/Territory | China |
| City | Hefei |
| Period | 22/05/2016 → 26/05/2016 |
Keywords
- Active damping
- Proportional resonant (PR) controller
- Grid-connected photovoltaic (PV) converter
- LCL-LC filter