摘要
针对等效电量函数有效区间在随机生产模拟过程中不断变化的性质,通过平移变换得到了固定的有效区间,提高了计算效率。基于等效电量函数法误差来源的分析,提出了两阶段定区间等效电量函数法。第一阶段进行水火电带负荷位置的协调优化,根据系统负荷及各机组容量的"最大公因子"确定尽可能大的模拟间隔,以在不损失精度要求的前提下提高计算效率;第二阶段仅对存在空闲容量的水电厂进行模拟,采用较小的间隔以提高失负荷概率(LOLP)指标的计算精度。采用IEEE-RTS 79修正及扩大系统的仿真分析表明,相比于传统的等效电量函数法,所提方法在相同的精度要求下具有更高的计算效率,特别适用于对LOLP指标精度要求较高的场合。
Since the effective range of the equivalent energy function change continuously during probabilistic production simulation,the fixed effective range is obtained by translation transformation,and thereby the computational efficiency is improved.Based on the analysis of the error sources of the equivalent energy function,a two-stage fixed-range equivalent energy function method is proposed.In the first stage,the position of loads applied by hydro-thermal power is coordinated and optimized,and according to the maximal common factor of the system load and the capacity of each unit,the simulation interval is determined as large as possible to the improve the computational efficiency without loss of precision.In the second stage,only the hydropower plants with idle capacity is simulated,which could improve the computational precision of LOLP（Loss Of Load Probability） by utilizing smaller simulation intervals.Simulative results of the modified IEEE-RTS 79 system demonstrate that the proposed method is computationally more efficient than traditional equivalent energy function methods with a same calculation precision,and therefore it is more suitable for cases where the requirement of LOLP index is high.
出处
《电力自动化设备》
EI
CSCD
北大核心
2017年第11期169-175,共7页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51537010)~~
关键词
水火发电系统
随机生产模拟
等效电量函数法
定区间
两阶段优化
可靠性指标
hydro-thermal generation system
probabilistic production simulation
equivalent energyfunction method
fixed-range
two-stage optimization
reliability index
