Abstract
Inverter-based distributed energy resources (DERs) can supply high-quality ac power in a microgrid due to their fast dynamic response. To achieve high reliability in an islanded microgrid, they are normally operated as voltage-controlled sources. However, the net load supplied by voltage-controlled inverter-based DERs can exceed their rated capacity, particularly during their transition from the grid-connected operation mode. Therefore, a comprehensive analysis of the DER survivability for overload conditions is crucial. Several experimental tests were conducted at the Consortium for Electric Reliability Technology Solutions Microgrid Testbed on the prime-mover powered inverter-based DER for learning about its survivability during overload conditions. In this paper, a thorough investigation of the inverter-based DER's survivability is carried out based on the prime-mover stalling phenomenon. Analytical expressions are derived for key design parameters of load-shedding algorithms, such as time-to-threshold frequency, maximum time delay, and maximum survivability time. The theoretical estimates are validated with the results obtained from the experimental testing. Furthermore, the minimum load-shedding estimate is determined for any prime-mover powered inverter-based DER to survive a transient overload condition.
| Original language | English |
|---|---|
| Article number | 8561252 |
| Pages (from-to) | 1214-1224 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 55 |
| Issue number | 2 |
| DOIs | |
| State | Published - Mar 1 2019 |
| Externally published | Yes |
Funding
Manuscript received July 15, 2018; revised November 15, 2018; accepted November 18, 2018. Date of publication December 4, 2018; date of current version February 20, 2019. Paper 2018-PSPC-0629.R1, presented at the 2018 IEEE Industry Applications Society Annual Meeting, Portland, OR, USA, Sep. 28–29, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLI-CATIONS by the Power Systems Protection Committee. This work was supported in part by the Office of Naval Research under Award N00014-16-1-2753 and in part by the Office of Electricity Delivery and Energy Reliability, Transmission Reliability Program of the U.S. Department of Energy under subcontract 7004227 with The Ohio State University administered by the Lawrence Berkeley National Laboratory. (Corresponding author: Jongchan Choi.) J. Choi and M. S. Illindala are with The Ohio State University, Columbus, OH 43210 USA (e-mail:,[email protected]; [email protected]).
| Funders | Funder number |
|---|---|
| Office of Naval Research | N00014-16-1-2753 |
| U.S. Department of Energy | 7004227 |
| Office of Electricity Delivery and Energy Reliability | |
| Lawrence Berkeley National Laboratory | |
| Ohio State University |
Keywords
- Distributed power generation
- inverters
- islanding
- load shedding
- microgrids
- overload conditions
- permanent-magnet synchronous generator (PMSG)
- power system protection
- survivability
