Discussion of the Physical Mechanisms Behind the Observed Behavior of Motors in Islanded Loads

As work continues on synchronizing anti-islanding standards worldwide, disagreement remains as to whether it is necessary to include motors in the loads used in the tests. One reason is that there is still a lack of a full physical understanding of the behavior of motor loads in islands. This paper explores the behavior of single-phase induction motors in islands and proposes a theory to explain the available observations. The use of parallel RLC loads to adequately model motors for islanding tests is discussed. Finally, the appropriateness of including a motor acting as a flywheel is questioned