计及背靠背柔直运行灵活性的机组组合建模优化方法  

Optimization for Unit Commitment Considering Operational Flexibility of Back-to-Back VSC-HVDC

作　　者：翟鹤峰 李豹[2] 马骞[2] 王子强[2] 刘春晓[2] 周保荣 周鑫 ZHAI Hefeng;LI Bao;MA Qian;WANG Ziqiang;LIU Chunxiao;ZHOU Baorong;ZHOU Xin(Electric Power Research Institute of China Southern Power Grid,Guangzhou 510663,Guangdong Province,China;Power Dispatching&Communication Center of China Southern Power Grid,Guangzhou 510663,Guangdong Province,China)

机构地区：[1]南方电网科学研究院有限责任公司,广东省广州市510663 [2]中国南方电网电力调度控制中心,广东省广州市510663

出　　处：《电网技术》2024年第6期2660-2669,I0120,I0121,共12页Power System Technology

基　　金：国家重点研发计划项目(2019YFE0118400);中国南方电网公司重点科技项目(000000KK52180214)。

摘　　要：背靠背柔性直流(后文简称柔直)因其具有降低短路电流、实现潮流快速翻转等优势正逐步应用于实际电力系统问题中,然而,背靠背柔直嵌入的电力系统优化调度问题的研究仍旧十分有限。为充分挖掘背靠背柔直运行灵活性的特性,紧密结合实际工程背景需求,以电力系统典型的机组组合问题为例,提出了一种计及背靠背柔直运行灵活性的机组组合建模优化方法。首先,介绍了基于等值虚拟机建模思路的背靠背柔直优化模型,该模型考虑了背靠背柔直运行时功率调整的各项控制需求,包括功率调节方向、调节次数、功率翻转控制要求以及送电模式关联约束等,既避免了设备频繁动作可能带来的使用寿命缩短的问题,同时又保证了模型优化结果在现场的实际可执行性;其次,结合所构建的背靠背柔直模型提出了一种计及其灵活性的机组组合模型,并给出了该模型相应的转化求解方法。最后,通过对修改的IEEE 14节点、118节点系统的测试分析以及国内某实际电网的应用测试情况,验证了将所提柔直模型纳入机组组合问题进行联合优化的有效性,同时可以在保证系统运行安全性的前提下提升运行的经济性。Due to the promising advantages of reducing short-circuit currents and achieving fast power flow reversal,the back-to-back voltage source-converter-based high voltage direct current(VSC-HVDC)is gradually being applied to deal with the practical power system problems.However,the study on the back-to-back VSC-HVDC-embedded power system decision-making issues is still very limited.This paper,closely combining the practical engineering background and taking a typical unit commitment problem in power systems as an example,proposes an optimization method for the unit commitment that fully takes into account the operational flexibility of back-to-back VSC-HVDC.Firstly,a back-to-back VSC-HVDC model based on the equivalent virtual generators is introduced,incorporating various control requirements for power adjustment during operation.This model encompasses constraints of power adjustment directions,adjustment times,power flip requirements,and power delivery modes.It not only avoids the issue of shortened lifespan due to frequent device operations but also guarantees the on-site practical feasibility of model optimization results.Secondly,a unit commitment model considering the back-to-back VSC-HVDC is presented,and the corresponding reformulation method is given.Finally,the effectiveness of the proposed model is verified by the modified IEEE 14-bus,the IEEE 118-bus,and a certain power grid test systems in China.The simulation results show that the developed model is able to improve the economy of system operations while ensuring safety.

关 键 词：背靠背柔直 机组组合 功率翻转 电力市场 等值虚拟机 

分 类 号：TM721[电气工程—电力系统及自动化]