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Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLs
- Source :
- IET Smart Grid (2020)
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- In this study, a DC micro‐grid consisting of multiple paralleled energy resources interfaced by both bidirectional AC/DC and DC/DC boost converters and loaded by a constant power load (CPL) is investigated. By considering the generic dq transformation of the AC/DC converters' dynamics and the accurate nonlinear model of the DC/DC converters, two novel control schemes are presented for each converter‐interfaced unit to guarantee load voltage regulation, power sharing and closed‐loop system stability. This novel framework incorporates the widely adopted droop control and using input‐to‐state stability theory, it is proven that each converter guarantees a desired current limitation without the need for cascaded control and saturation blocks. Sufficient conditions to ensure closed‐loop system stability are analytically obtained and tested for different operation scenarios. The system stability is further analysed from a graphical perspective, providing valuable insights of the CPL's influence onto the system performance and stability. The proposed control performance and the theoretical analysis are first validated by simulating a three‐phase AC/DC converter in parallel with a bidirectional DC/DC boost converter feeding a CPL in comparison with the cascaded PI control technique. Finally, experimental results are also provided to demonstrate the effectiveness of the proposed control approach on a real testbed.
- Subjects :
- closed-loop system stability
Computer science
power distribution control
current limitation
control design
system performance
nonlinear control systems
cascaded control
cpl
load voltage regulation
power system stability
control approach
multiple paralleled energy resources
Voltage droop
novel control framework
cascade control
traditional cascaded pi control technique
Testbed
converter-interfaced unit
converter unit
nonlinear model
control schemes
control system synthesis
control performance
lcsh:TK1-9971
ac-dc power convertors
Information Systems
power generation control
Computer Networks and Communications
dc-dc power convertors
distributed power generation
droop control expressions
Control theory
Stability theory
constant power load
Electrical and Electronic Engineering
theoretical stability analysis
input-to-state stability theory
voltage control
power sharing
Converters
dc microgrid instability
dc microgrid architecture
Nonlinear system
Current limiting
Boost converter
Voltage regulation
lcsh:Electrical engineering. Electronics. Nuclear engineering
electric current control
closed loop systems
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- IET Smart Grid (2020)
- Accession number :
- edsair.doi.dedup.....449e5b41571b11b7f6fc5d4e1b57ee2b