Abstract
Grid-interactive inverters allow distributed generation units to provide various ancillary services in microgrids. As the linear modulation region of inverters is restricted by the dc-bus voltage, providing ancillary services may drive the fundamental positive-sequence inverter voltage to the overmodulation region. Therefore, to operate in the linear modulation region the maximum active- A nd reactive-power of the inverter may have to be reduced unless pulsewidth modulation (PWM) references are adjusted. In this paper, an atypical PWM method is proposed for maximizing dc-bus utilization of grid-interactive two-level voltage source inverters (2L-VSI) providing ancillary services. Two important ancillary services, i.e., negative-sequence compensation and harmonic compensation are considered in this paper. The proposed method increases the maximum active- A nd reactive-power that a 2L-VSI can deliver when providing ancillary services by injecting a common-mode component in the references computed based on instantaneous reference magnitudes. The validity of the proposed technique is verified through simulation, as well as experimental data obtained using a 208-V three phase grid-connected 2L-VSI.
| Original language | English |
|---|---|
| Article number | 8436000 |
| Pages (from-to) | 648-658 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 55 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2019 |
| Externally published | Yes |
Funding
Manuscript received February 6, 2018; revised June 6, 2018; accepted July 17, 2018. Date of publication August 13, 2018; date of current version December 12, 2018. Paper 2018-SECSC-0196.R1, presented at the 2018 IEEE Applied Power Electronics Conference and Exposition (APEC), San Antonio, TX, USA, Mar. 4–8, and approved for publication in the IEEE TRANSACTIONS ON IN-DUSTRY APPLICATIONS by the Renewable and Sustainable Energy Conversion Systems Committee of the IEEE Industry Applications Society. This work was supported by the National Science Foundation under Grant ECCS-1351665. (Corresponding author: Behrooz Mirafzal.) A. Adib and B. Mirafzal are with the Electrical and Computer Engineering Department, Kansas State University, Manhattan, KS 66506 USA (e-mail:, [email protected]; [email protected]).
| Funders | Funder number |
|---|---|
| National Science Foundation | ECCS-1351665 |
Keywords
- Ancillary (auxiliary) services
- atypical pulsewidth modulation (PWM)
- dc-bus utilization
- harmonic compensation
- microgrids
- negative-sequence compensation