It is an important part of energy development strategy in China to utilize Southwest hydropower actively and properly.The installed capacities of current hydropower plants are generally large and the annual utilization hours are decreasing continuously.Installed capacity of hydropower plants should based on the balance between plant itself and served power system.While most hydropower plants serve the demand of local provinces, some serve in east provinces faraway through long distance transmission lines.Power demand of provinces has distinct features, and has different requirement for hydropower plant capacity.In addition to technical and economic indices of plant itself, the installed capacity should consider its function in served power systems and related transmission projects.It is not advisable to reduce the annual utilization hours for those power plants which have the need to transmit generated power to the east provinces.%合理利川西南水电资源是我国能源发展战略的重要组成部分,当前在水电开发中,水电站装机容量普遍偏大,利用小时数不断降低.水电站合理装机容q是电厂和电网2方而综合考虑的结果.西南水电不仅要满足送端省用电需求,还有部分电站要外送到东部负荷中心.送受端系统特点不同,对水电站的装机容量要求也不同因此水电站装机容4:不宜仅考虑自身的技术经济指标,还应考虑在系统中的定位和电网送出工程,对于西电东送电源不宜降低利用小时数.
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