There are many methods for analysing electronic circuit, such as branchcurrent, node voltage, mesh current and loop current method.
电路的一般分析方法有许多，如支路法、节点法、网孔法和回路法等。
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Phasor measurement unit(PMU)based on GPS is a new and precise measuring device, which can be used to measure bus voltage phasor and branchcurrent phasor.
Then the isomorphism judgment criterion based on the circuit analysis is obtained by applying the circuit laws and the method of branchcurrent to the circuit models.