考虑频率与区间联络线功率安全约束的两区互联电力系统机组组合  

Unit commitment considering safety constraints of frequency and inter-areal tie-line power in two-area interconnected power system

作　　者：申家锴 刘洋[2] 李卫东[1] 顾泰宇 巴宇[1] 王海霞[1] SHEN Jiakai;LIU Yang;LI Weidong;GU Taiyu;BA Yu;WANG Haixia(School of Electrical Engineering,Dalian University of Technology,Dalian 116024,China;Northeast Branch of State Grid Corporation of China,Shenyang 110180,China;Electric Power Research Institute of State Grid Liaoning Electric Power Co.,Ltd.,Shenyang 110006,China)

机构地区：[1]大连理工大学电气工程学院,辽宁大连116024 [2]国家电网公司东北分部,辽宁沈阳110180 [3]国网辽宁省电力有限公司电力科学研究院,辽宁沈阳110006

出　　处：《电力自动化设备》2022年第11期167-175,189,共10页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51677018);国家电网公司科技项目(2021YF-11)。

摘　　要：随着电源结构与电网形态的转变,互联电力系统频率时空分布特征日益显著,区域频率差异与区间联络线功率振荡增大,基于统一频率假设的频率安全约束机组组合方法不再适用。针对考虑频率时空分布特征的两区互联电力系统安全约束机组组合,推导区域频率与区间联络线功率闭式解,并基于闭式解的两项划分,推得区域频率最低点、最大变化率、准稳态值以及区间联络线功率振荡峰值、准稳态值等一系列解析安全量化指标。基于所得指标,构建考虑区域频率与区间联络线功率安全约束的机组组合模型。并根据调度模式与指标特点,提出兼顾区域能力保障与区间能力协调的两级两阶段迭代求解算法。结果表明,所得指标可准确描述两区互联电力系统的安全特征,所提模型和算法可有效保障两区互联电力系统机组组合方案的运行安全。With the transformation of the power generation structure and the power grid form,the spatialtemporal characteristics of frequency in interconnected power systems have become prominent,the areal frequency differences and ITP(Inter-area Tie-line Power)oscillation have increased,where the unit commitment with frequency safety constraint based on the unified frequency assumption is no longer applicable.For considering the spatial-temporal characteristics in the safety constrained unit commitment of two-area interconnected power system,the closed-form solutions of areal frequency and ITP are derived.Then,a series of analytic safety indicators such as the nadir value,maximum rate value,quasi-steady-state value of areal frequency,and the peak value,quasi-steady-state value of ITP are deduced based on the two-terms division of closed-form solutions.Moreover,based on the obtained indicators,the unit commitment model with safety constraints about areal frequency and ITP is established.And based on the scheduling modes and indicator characteristics,the two-level two-stage iterative solution algorithm giving consideration to areal capacity guarantee and interval capacity coordination is proposed.Results show that the proposed indicators can accurately describe the safety characteristics of two-area interconnected power system,and the proposed model and algorithm can effectively guarantee the operation safety of the unit commitment scheme in twoarea interconnected power system.

关 键 词：互联电力系统 频率安全 联络线功率安全 解析安全量化指标 机组组合 

分 类 号：TM761.2[电气工程—电力系统及自动化]