| 引用本文: | 胡剑,王建,熊小伏,乌睿.计及线路动态电热特性的交直流混联电网过载控制策略[J].电力系统保护与控制,2020,48(7):66-75.[点击复制] |
| HU Jian, WANG Jian, XIONG Xiaofu, WU Rui.An overload control strategy for AC/DC hybrid power grid considering dynamic electro-thermal characteristics of transmission lines[J].Power System Protection and Control,2020,48(7):66-75[点击复制] |
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| 摘要: |
| 交直流混联电网中大容量直流闭锁或交流线路因故障切除会引发潮流大幅度转移，增加电网连锁故障风险，需及时采取安全控制措施阻断事故的扩大。为此提出一种交直流混联电网过载控制策略，该策略充分挖掘输电线路耐受过负荷的能力，引入导线动态电热特征量作为线路安全约束，协调健全直流输送功率调节、机组有功调整以及切负荷等多种手段，实现与时间关联的潮流动态优化控制。控制模型以总控制代价最小为目标函数，经过变量的优化筛选在较短时间内得到安全且经济的过载控制方案，可有效地避免混联电网连锁跳闸事故发生。最后，基于改进的IEEE39节点交直流混联系统，与采取不同线路安全约束条件、不同优化变量的控制方法相对比，验证了所提过载控制策略的有效性及优越性。 |
| 关键词: 交直流混联电网 连锁故障 输电线路 动态电热特性 过载控制 |
| DOI：10.19783/j.cnki.pspc.201905 |
| 投稿时间：2019-03-15修订日期：2019-09-19 |
| 基金项目:中央高校基本科研业务费专项资金资助(SWU 119039);国家重点研发计划项目资助(2016YFB0900600) |
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| An overload control strategy for AC/DC hybrid power grid considering dynamic electro-thermal characteristics of transmission lines |
| HU Jian,WANG Jian,XIONG Xiaofu,WU Rui |
| (CET-College of Engineering and Technology, Southwest University, Chongqing 400715, China;State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China;Chongqing Urban Power Supply Branch, State Grid Chongqing Electric Power Company, Chongqing 400015, China) |
| Abstract: |
| The blocking of large-ampacity HVDC or the tripping of the AC transmission line after an accident will cause power flow transfer sharply and increase the risk of cascading faults in AC/DC hybrid power grid. Therefore, it is needed to take reasonable safety control measures to prevent the spreading of the accident in time. An overload control strategy for AC/DC hybrid power grid is proposed. This strategy brings the dynamic electro-thermal characteristics of the conductor into the safety constraints to fully excavate the short-time overload capability of transmission lines and then coordinates the active power adjustment of generators, power transmission adjustment of HVDC, and load shedding measures to realize the dynamic optimal power flow control associated with time. The optimization control model takes minimum total cost as the objective function, which can quickly obtain the economic and reasonable overload control scheme through selecting control variables, to effectively prevent cascading tripping in AC/DC hybrid power grid. Finally, compared with the control methods by adopting different line safety constraints and different optimal variables, the effectiveness and superiority of the proposed strategy are verified through case studies on the modified IEEE 39-node power systems. This work is supported by Fundamental Research Funds for the Central Universities (No. SWU119039) and National Key Research and Development Program of China (No. 2016YFB0900600). |
| Key words: AC/DC hybrid power system cascading faults transmission line dynamic electro-thermal characteristic overload control |
