混合级联特高压直流功率损失计算方法研究  

Research on Power Losss Calculation Method of Hybrid Cascaded UHVDC

作　　者：刘凯[1] 赵文强[1] 侍乔明 王永平[1] LIU Kai;ZHAO Wen-qiang;SHI Qiao-ming;WANG Yong-ping(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电力电子技术》2024年第6期50-53,60,共5页Power Electronics

基　　金：国家重点研发计划(2021YFB2400805)。

摘　　要：混合级联特高压直流(UHVDC)在降低直流换相失败风险的同时提升了直流输电的灵活性,但由于LCC与VSC混合拓扑导致不同阀组闭锁后健全阀组的功率传输能力存在不确定性,影响了直流功率损失准确计算。此处提出了一种适用于混合级联UHVDC的功率损失计算方法。直流控制系统以极为单位计算阀组闭锁后的直流功率并发送安控系统计算直流功率损失,设计了合理接口与数据处理方式保证阀组单次及相继故障直流功率损失计算的准确性。最后通过试验,验证了所提方法的正确性与有效性。Hybrid cascaded ultra-high voltage direct current(UHVDC)reduces the risk of DC commutation failure and improves the flexibility of DC transmission.However,due to the mixed topology of LCC and VSC,there is uncertainty in the power transmission capacity of the healthy valve after different valves are blocked,which affects the accurate calculation of DC power loss.A DC power calculation method suitable for hybrid cascade UHVDC is proposed.The DC control system calculates the DC power after the valve is blocked and sends it to the security and stability control system to calculate the DC power loss.The reasonable interface and data processing method are designed to ensure the accuracy of the DC power loss calculation of single and successive failures of the valves.Finally,the correctness and effec-tiveness of the proposed method are verified through experiments.

关 键 词：混合级联特高压直流 功率损失计算 控制系统 

分 类 号：TM721.1[电气工程—电力系统及自动化]