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应对特高压环网故障热稳问题的多直流紧急控制策略
项锦晔1, 张爱军2, 陈得治3, 刘石川2, 杨明玉1, 邢华栋2, 白帅涛1, 周婕1, 李立新3, 吉平3, 唐晓骏3, 宋云亭3
1.华北电力大学 新能源电力系统国家重点实验室,河北 保定 071003;2.内蒙古电力科学研究院,内蒙古 呼和浩特 010020;3.中国电力科学研究院有限公司,北京 100192
摘要:
首先提出一种定位特高压环网开断故障下热稳问题的精准、遍历搜寻方法;然后建立了特高压直流矫正环网热稳问题的优化模型,并提出了一种快速、实用的定步长梯度下降寻优方法。求解过程中,提出了特高压环网目标线路的等效送、受端概念;同时,多直流调制灵敏度、调制方向、调制步长以及每一迭代步调制效果等的给出增强了控制策略寻优的物理意义。最后,基于实际的特高压环网工程,采用PSD-BPA仿真软件,对所提方法和策略的有效性进行了仿真验证。
关键词:  特高压环网  多馈入直流  直流功率紧急调制  热稳定性  灵敏度分析  梯度下降法
DOI:10.16081/j.epae.201909014
分类号:TM721.1
基金项目:国家电网公司工程专项(山东—河北环网特高压交流工程电网稳定分析及安控措施研究)
Multi-DC emergency control strategies for thermal stability of UHV loop network faults
XIANG Jinye1, ZHANG Aijun2, CHEN Dezhi3, LIU Shichuan2, YANG Mingyu1, XING Huadong2, BAI Shuaitao1, ZHOU Jie1, LI Lixin3, JI Ping3, TANG Xiaojun3, SONG Yunting3
1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, China;2.Inner Mongolia Electric Power Research Institute, Hohhot 010020, China;3.China Electric Power Research Institute, Beijing 100192, China
Abstract:
Firstly, an accurate and traversal search method for locating the thermal stability problem under interruption faults of UHV(Ultra High Voltage) loop network is proposed. Then an optimization model for UHVDC(UHV Direct Current) to correct thermal stability problem of loop network is established, and a fast and practical method for fixed-step gradient descent optimization is proposed. In the solving process, the concept of equivalent sending and receiving end of the target transmission lines of UHV loop network is proposed, and the physical meaning of the control strategy optimization method is enhanced by giving the multi-DC modulation sensitivity, modulation direction, modulation step size, the modulation effect of each iteration and so on. Finally, based on the actual UHV loop network engineering, the PSD-BPA simulation software is used to simulate and verify the effectiveness of the proposed method and strategy.
Key words:  UHV loop network  multi-infeed DC  emergency modulation of DC power  thermal stability  sensitivity analysis  gradient descent method

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