考虑备切机组涉频特性的高频切机优化方法  

Optimization Method for Over-frequency Generator Tripping Considering Frequency-related Characteristics of Standby Unit

作　　者：姜惠兰[1] 李希钰 肖瑞[1] JIANG Huilan;LI Xiyu;XIAO Rui(Smart Grid Key Laboratory of the Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072

出　　处：《电力系统及其自动化学报》2023年第1期103-110,共8页Proceedings of the CSU-EPSA

摘　　要：高频切机是防止区域型送端电网因过剩功率引发频率失稳事故的主要手段。首先分析了高频切机动作切除机组对系统频率响应的影响方式,构建了考虑不同频率响应阶段下系统频率特性差异评价高频切机方案实施效果的目标函数。在此基础上,建立了切机量最小和评价指标最优的高频切机方案多目标优化的数学模型,提出了一种考虑备切机组涉频特性差异的高频切机方案递进修正优化方法。采取将备切机组等容量替换为新能源机组整定初始切机量,将不受备切机组涉频特性差异和切除顺序的影响。在寻优的迭代过程中,依据切机后的过剩功率水平对各轮次切机量进行修正。仿真对比分析验证了所整定的高频切机方案具有权衡总切机量最小与实施效果最优的优势。Over-frequency generator tripping is the main means to prevent frequency instability accidents caused by the excess power in regional power supply grids. In this paper,the influence of tripping different machines on the system frequency response is analyzed,and an objective function is constructed to evaluate the implementation effect of the over-frequency generator tripping scheme considering the difference in system frequency characteristics at different frequency response stages. On this basis,a mathematical model of multi-objective optimization is established for the overfrequency generator tripping scheme with minimum tripping capacity and optimal evaluation index,and an iterative modification optimization method for the over-frequency generator tripping scheme considering the difference in frequency-related characteristics of a standby unit is proposed. The way of replacing the equivalent capacity of the standby unit with the new energy unit to set the initial tripping capacity will not be affected by the differences in frequency-related characteristics of the standby unit or the tripping sequence. In the iterative optimization process,the setting value of each round of generator tripping is modified according to the excess power level after the generator tripping. Simulations and comparative analysis verify that the proposed scheme has an advantage of balancing the minimum total tripping capacity with the best implementation effect.

关 键 词：新能源 高频切机 涉频特性 频率响应 多目标优化 

分 类 号：TM315[电气工程—电机]