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This paper presents a method to eliminate solution "trapping" for the P.O.P. (Progressive Optimality Principle) based short-term hydrothermal scheduling algorithm. In a P.O.P. based scheduling algorithm, the "trapping" phenomenon can severely hinder solution optimality, and thus limits its applicability. The "trapping" phenomenon is caused by the "weak" links which break the optimization path into isolated segments, and thus destroy the path continuity required by the P.O.P. based decomposition approach. In order to ensure path continuity, the proposed method identifies and bypasses the potential "weak" l i s , such that global optimality can be achieved progressively by successively solving a sequence of two-hour sub-problem. In this paper, examples are used to illustrate the "trapping" phenomenon and the proposed method.

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