A microgrid architecture with multiple-input DC/DC converters : applications, reliability, system operation and control
Alexis Kwasinski
Bok · Engelsk · 2007
| Utgitt | Ann Arbor, Mich. : UMI/Proquest , 2007
|
|---|---|
| Omfang | XV, 162 s. : ill., fig.
|
| Opplysninger | Opptrykk av forfatterens avhandling (Ph.D.) - University of Illinois at Urbana, Champaign, 2007. - UMI-nummer : 3290284. - This dissertation proposes the use of a microgrid with multiple-input converters to achieve ultrareliable electric supply. The suggested architecture avoids the single point of failure present in traditional highly reliable power plants by using local generation units, microsources, to achieve power input diversity. Microsources need to be paralleled in clusters to improve availability. To achieve power input diversity, at least two clusters with different fuel or energy supply are needed. Multiple-input converters that combine boost and buck-boost legs integrate the various microsource outputs into a common main system bus. Both system-level design and component-level analysis issues are addressed. System-level issues include a systematic design approach that considers cost and availability to be the main characteristics. Availability is a design input and not an outcome of a selected architecture. The proposed design has a modular distributed architecture with a relatively high-voltage do main bus and a different secondary distribution voltage that depends on the application. Several applications are discussed, including both stationary systems and mobile systems. At a component level, several issues related to the proposed architecture operation and control are analyzed. Multiple-input converter power budget equations are derived and verified through simulations and experiments. Issues in distributed architectures, such as autonomous control, and fault detection and mitigation are also addressed. An autonomous control strategy that relies only on monitoring the main bus voltage is presented. To provide adequate fault detection and mitigation, energy storage location and magnitude are also discussed. This work analyzes constant-power loads present in distributed architectures and utilizes a global passivity-based control technique to derive a control law that stabilizes the converters. This analysis is supported with simulations and experiments.
|
| Emner | kraftelektronikk
doktorgradsavhandlinger |
| Dewey | |
| ISBN | 9780549340652
|