[Retracted] Distribution Network Security Situation Awareness Method Based on the Distribution Network Topology Layered Model

Table 1

The safe state solution time under the condition of configuring different numbers of phase measurement units.

System	Node number	PMU configuration node area layer number	Solution time (s)
IEEE-33	1, 5, 7	5, 5, 7	0.127
	1, 4, 15, 23, 33	5, 4, 3, 2	0.053
	1, 4, 7, 22, 34	3, 3, 3, 5, 6	0.034
	23, 25, 27, 31	2, 2, 2, 2, 2, 2, 2, 2	0.547
	14, 26, 33, 36	2, 2, 2, 2, 2	0.317