Abstract
To increase the power rating of three-phase grid-connected inverters, a topology of parallel three-phase grid-connected inverters composed of interphase inductors is proposed. The equivalent circuit was derived by decoupling the interphase inductors. Besides, the average-value models were obtained in the three-phase stationary coordinates and the synchronous rotating coordinates respectively. The fundamental mechanism of zero-sequence circulating current suppression with interphase inductors is that the interphase inductors can increase the impedance of zero-sequence circulating current. Then the control strategy of the system was designed according to the average-value model in the synchronous rotating coordinates. The zero-sequence circulating currents were suppressed well and the discrepancy and distortion of currents were overcome. Therefore, the reliability and efficiency of the system were improved. Finally, the parallel three-phase grid-connected inverters with the power rating of 1.5 MW were simulated, which verified the validity of the above analysis and control strategy.
| Original language | English |
|---|---|
| Pages (from-to) | 7-12 |
| Number of pages | 6 |
| Journal | Dianji yu Kongzhi Xuebao/Electric Machines and Control |
| Volume | 16 |
| Issue number | 12 |
| Publication status | Published - Dec 2012 |
| Externally published | Yes |
Keywords
- Average-value model
- Grid-connected inverter
- Interphase inductor
- Parallel operation
- Zero-sequence circulating current
ASJC Scopus subject areas
- Control and Systems Engineering
- Energy Engineering and Power Technology
- Computer Science Applications
- Electrical and Electronic Engineering