Security-constrained generation scheduling with feasible energy delivery

Hongyu Wu, X. Guan, Q. Zhai, F. Gao, Yuanchao Yang
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引用次数: 13

Abstract

Security-constrained generation scheduling (SCGS) is an indispensable tool for independent system operators (ISOs) to plan a secure and economical hourly generation schedule in the daily/weekly ahead markets. Power outputs of thermal units are usually formulated as step functions in almost all literature on SCGS, i.e., the generation level schedule is taken as an energy delivery schedule. The ramp-rate constraints are also simplified as limits on the differences of generation levels in consecutive time periods. However, it has been found in our previous work that the energy delivery schedule obtained from this formulation may not be realizable. The schedule obtained is generally different from what is implemented. In this paper, feasible energy delivery is embedded in SCGS model and power outputs of thermal units are formulated as piece-wise linear functions rather than step functions. The schedule obtained from the new formulation is deliverable in terms of energy and precise ramping process for implementing the energy schedule is also obtainable. A mixed-integer linear programming (MILP) method is applied to solve the problem with the new formulation and numerical testing is performed for a six-bus system and an IEEE 118-bus system. The testing results and primary analysis show that the new formulation is valid.
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具有可行能量输送的安全约束发电计划
安全约束发电计划(SCGS)是独立系统运营商(iso)在每日/每周提前市场中制定安全且经济的小时发电计划不可或缺的工具。在几乎所有关于SCGS的文献中,通常将热机组的功率输出表示为阶跃函数,即将发电水平计划作为能量输送计划。斜坡率约束也被简化为对连续时间段内发电水平差异的限制。然而,在我们之前的工作中发现,从这个公式得到的能量输送时间表可能是不可实现的。获得的进度通常与实现的进度不同。本文将可行的能量输送嵌入到SCGS模型中,并将热机组的功率输出表示为分段线性函数而不是阶跃函数。新公式得到的时间表在能源方面是可交付的,并且还获得了实施能源时间表的精确斜坡过程。采用混合整数线性规划(MILP)方法对该公式进行求解,并对六总线系统和IEEE 118总线系统进行了数值测试。试验结果和初步分析表明,新配方是有效的。
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