考虑复杂约束的水电站AGC控制策略

Automatic Generation Control Strategies of Hydropower Plant Considering Complex Constraints

大容量高水头多振动区巨型水电站并网发电给电力系统自动发电控制(automatic generation control,AGC)运行带来极大挑战。该文综合考虑机组多振动区、调节范围、调节精度、调节速率等复杂约束,以全站有功计划为控制目标,系统提出水电站AGC控制策略。提出单机、分组、组合3种分布方式构建机组联合运行模型,利用区间组合理论确定各机组组合的可行调节域,引入AGC触发条件和机组穿越振动区或进入限制运行区台次最少的优先级策略,通过匹配全站有功计划值和机组联合运行模型,确定实时调节的最优机组组合和负荷分配结果,并叠加一次调频修正有功,实现AGC与一次调频的闭环反馈调节。糯扎渡电站AGC模拟运行结果表明,所提策略是合理可行的,比常规策略能更高效地处理多振动区和复杂机组组合运行等新的复杂约束和工况。

The commissioned huge hydropower plants with high-head and multi-vibration zones impose new difficulty on the automatic generation control （AGC）. In this paper, a strategy for AGC of hydropower plant was developed with complex constraints such as multi-vibration zones, regulating range, regulating scale, regulating rate, etc., and the objective of required generation schedule. In this strategy, three distribution types including single, grouping and combination types, were presented to formulate the optimization models of hydropower unit operations. Their feasible combination zones were determined by the interval combination principle. The triggering conditions of AGC and a priority strategy for reducing the unit number of passing through the vibration zones or restricted zones were integrated to determine the optimal unit commitment and load distribution. Moreover, the primary frequency modulation was made to further adjust the generation in order to coordinate AGC with itsel A case study about Nuozhadu Hydropower Plant shows that the proposed strategy is rational and feasible. Compared to the conventional strategies, our strategy can well deal with complicated operation situations with multi-vibration zones and multi-type unit commitment.