@article{Bottrell:2013:10.1109/TPEL.2013.2241455,
author = {Bottrell, N and Prodanovic, M and Green, TC},
doi = {10.1109/TPEL.2013.2241455},
journal = {IEEE Transactions on Power Electronics},
pages = {5107--5119},
title = {Dynamic Stability of a Microgrid With an Active Load},
url = {http://dx.doi.org/10.1109/TPEL.2013.2241455},
volume = {28},
year = {2013}
}

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TY  - JOUR
AB  - Rectifiers and voltage regulators acting as constant power loads form an important part of amicrogrid’s total load. In simplified form, they present a negative incremental resistance and beyondthat, they have control loop dynamics in a similar frequency range to the inverters that may supply amicrogrid. Either of these features may lead to a degradation of small-signal damping. It is known thatdroop control constants need to be chosen with regard to damping, even with simple impedance loads.Actively controlled rectifiers have been modelled in non-linear state-space form, linearised around anoperating point, and joined to network and inverter models. Participation analysis of the eigenvalues ofthe combined system identified that the low-frequency modes are associated with the voltage controllerof the active rectifier and the droop-controllers of the inverters. The analysis also reveals that whenthe active load DC-voltage controller is designed with large gains, the voltage controller of the inverterbecomes unstable. This dependency has been verified by observing the response of an experimentalmicrogrid to step changes in power demand. Achieving a well-damped response with a conservativestability margin does not compromise normal active rectifier design, but notice should be taken of theinverter-rectifier interaction identified.
AU  - Bottrell,N
AU  - Prodanovic,M
AU  - Green,TC
DO  - 10.1109/TPEL.2013.2241455
EP  - 5119
PY  - 2013///
SN  - 1941-0107
SP  - 5107
TI  - Dynamic Stability of a Microgrid With an Active Load
T2  - IEEE Transactions on Power Electronics
UR  - http://dx.doi.org/10.1109/TPEL.2013.2241455
UR  - http://hdl.handle.net/10044/1/12626
VL  - 28
ER  - 

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