The recently proposed non-iterative load flow method, called the holomorphicembedding method, may encounter the precision issue, i.e. nontrivial round-offerrors caused by the limit of digits used in computation when calculating thepower-voltage (P-V) curve for a heavily loaded power system. This letterproposes a multi-stage scheme to solve such a precision issue and calculate anaccurate P-V curve. The scheme is verified on the New Eng-land 39-bus powersystem and benchmarked with the result from the traditional continuation powerflow method.
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