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基于安全距离灵敏度的交直流混联系统安全校正策略
陈中1,2, 朱政光1,2, 严俊1,2
1.东南大学 电气工程学院,江苏 南京 210096;2.江苏省智能电网技术与装备重点实验室,江苏 南京 210096
摘要:
大型交直流混联系统中,直流系统的大容量、灵活可控等特征使得交直流混联电网的动力学特性有了根本变化,运行控制难度急剧增大。直流闭锁后潮流的大范围转移将严重影响系统的稳定运行,迫切需要研究交直流混联系统的安全校正策略。为此,提出一种基于静态安全距离灵敏度的交直流混联系统安全校正方法。在交直流混联系统静态安全域理论的基础上,为了适应电力系统在线计算的要求,对安全域边界面进行线性回归拟合并给出修正安全距离及其灵敏度的计算方法。通过对安全域的伸缩变化以表征不同维度变量的控制代价,并在此基础上求取安全校正指导矢量。根据各控制变量对指导矢量的灵敏度和各控制变量的实际调节能力对其进行排序,并依次将其代入安全校正模型中进行求解,以使得调节过程中的总调整量最小。对改造后的IEEE 39节点交直流混联系统和简化实际电网进行分析计算,结果验证了所提安全校正策略的正确性与有效性。
关键词:  交直流混联系统  静态安全域  线性拟合  安全距离灵敏度  安全校正
DOI:10.16081/j.epae.201909020
分类号:TM712;TM721.3
基金项目:国家重点研发计划项目(2016YFB0900602)
Security correction strategy of AC/DC hybrid system based on security distance sensitivity
CHEN Zhong1,2, ZHU Zhengguang1,2, YAN Jun1,2
1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Nanjing 210096, China
Abstract:
In the large-scale AC/DC hybrid system, the dynamic characteristics of AC/DC hybrid power grid have been fundamentally changed due to the large capacity, flexible and controllable characteristics of the DC system, and the difficulty of operation and control has increased sharply. The large-scale transfer of power flow after DC blocking will seriously affect the stable operation of the system. It is urgent to study the security correction strategy of AC/DC hybrid system. Therefore, a safety correction method for AC/DC hybrid system based on steady-state security distance sensitivity is proposed. Based on the steady-state security region theory of AC/DC hybrid system, in order to meet the requirements of online calculation of power system, the linear fitting of the security region boundary surface is performed and the calculation method of security distance and its sensitivity are given. The control cost of different dimensional variables is characterized by the expansion and contraction of the security region, on this basis, the security correction guidance vector is obtained. According to the sensitivity of each control variable to the guidance vector and the actual adjustment ability of each control variable, it is sorted and substituted into the security correction model to minimize the total adjustment during the regulation process. Based on the analysis and calculation of the modified IEEE 39-bus AC/DC hybrid system and the simplified actual power grid, the correctness and effectiveness of the proposed security correction strategy are verified.
Key words:  AC/DC hybrid system  steady-state security region  linear fitting  security distance sensitivity  secu-rity correction

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