新型电力系统建设中直流拓扑优化技术和应用场景分析

DC Topology Optimization Technology and Application Scenario Analysis in New Power System Construction

我国陆上风电和光伏发电主要集中在“三北”地区,而用电负荷中心在数千公里之外的沿海地区,大容量远距离直流输电技术应用广泛。此外,海上风电逐步迈向深远海后,直流输电优势凸显,应用前景广阔。但常规直流输电受扰后存在换相失败的问题,分析了最新直流拓扑优化技术及其仿真结果,新型直流对于避免多馈入直流相继换相失败乃至闭锁带来的安全风险、改善海上风电场黑启动条件和降本增效有积极意义。

China's onshore wind power and photovoltaic power generation are mainly concentrated in the"three north"areas,while the power load center is located in the coastal areas thousands of kilometers away.The large-capacity long-distance DC transmission technology is widely used.In addition,as offshore wind power gradually moves into the deep sea,DC transmission has prominent advantages and broad application prospects.However,there is a problem of commutation failure after the disturbance of conventional DC transmission.This paper analyzes the latest DC topology optimization technology and its simulation results.The new DC has positive significance in avoiding the security risks caused by the successive commutation failure and even the locking of multi-infeed DC,improving the black-start conditions of offshore wind farms,and reducing costs and increasing efficiency.