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该文是两篇系列论文中的第2篇，论述在第1篇中提出的机组旋转备用宽度概念在具有正、负旋转备用约束机组组合问题求解中的应用。正、负旋转备用约束是系统接入大规模出力高不确定性电源后，机组组合问题中常见的重要系统约束，该文提出此类问题可行解的解析充分必要条件。该条件由与机组启停状态有关的5个线性不等式组成，不等式中包含了机组旋转备用宽度在内的若干参数。这组充分必要条件可作为有效不等式使用，数值测试发现，将该组不等式加入原始机组组合模型后，求解机组组合问题的商业优化软件包的计算效率可明显提高，同时发现该可行性条件提供了一种判定机组组合解鲁棒性的高效途径，可直接用于基于多场景的机组组合随机规划模型中。“,”ABSTRACT:This is the second part of a series of two papers. Applications of the concept of spinning reserve width (SRW) proposed in the first part of the series of papers are discussed. Up/down spinning reserve requirements were among the important system wide constraints in unit commitment (UC) including power sources with uncertain power outputs. A group of analytical necessary and sufficient feasibility conditions for such UC problems were proposed in this paper. The conditions were composed of five linear inequalities with respect to the commitment states of generators. Parameters of generators including SRW appear in the inequalities. The inequalities can be used as valid inequalities of integer programming. It is found that the computation efficiency of commercial solvers can be improved when the inequalities are added to the original UC formulation and the conditions provide an efficient way to identify the robustness of a UC solution for scenario based UC formulations.