电工技术学报  2024, Vol. 39 Issue (5): 1352-1371    DOI: 10.19595/j.cnki.1000-6753.tces.231310
电力系统与综合能源 |
基于故障安全域的混合级联直流输电系统后续换相失败抑制策略
王鹤, 郭家治, 边竞, 李国庆, 王拓
现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学) 吉林 132012
Subsequent Commutation Failure Suppression Strategy for Hybrid Cascaded HVDC System Based on Fault Security Region
Wang He, Guo Jiazhi, Bian Jing, Li Guoqing, Wang Tuo
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China
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摘要 混合级联直流输电系统兼顾了电网换相换流器(LCC)和模块化多电平换流器(MMC)的优势,具有良好的工程应用前景,但系统逆变侧LCC与MMC间复杂的交直流耦合特性增加了后续换相失败的抑制难度。为此,该文提出了一种应对混合级联系统后续换相失败的协调控制策略。首先,分析了控制器交互期间电气量波动和LCC无功需求对系统恢复产生的不利影响,并在考虑控制器作用和MMC动态无功支撑的基础上建立了多电气量耦合作用下的故障安全域;其次,通过对混合级联系统和基于电网换相换流器的高压直流输电故障安全域对比分析,提出了一种基于MMC和低压限流环节(VDCOL)的协调控制策略,以实现系统后续换相失败抑制和功率快速平稳恢复相协调;最后,基于PSCAD/EMTDC分别在不同严重程度交流故障、不同短路比和不同故障持续时间下进行仿真对比分析,验证了所提协调控制策略的有效性。
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王鹤
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李国庆
王拓
关键词 混合级联直流输电系统后续换相失败故障恢复期间故障安全域协调控制策略    
Abstract:The hybrid cascaded high voltage direct current (HVDC) system combines the advantages of line commutated converter (LCC) and modular multilevel converter (MMC), making it a prominent area of focus in both academic research and engineering applications. When an AC fault occurs in the hybrid cascaded HVDC system, it may lead to the first commutation failure of the LCC converter on the inverter side. During the recovery period of the system after the first commutation failure, significant fluctuations in the electrical quantity on the inverter side and large reactive power demand on the LCC may lead to subsequent commutation failures at the end of the recovery period, seriously endangering the stable operation of the power system. The investigation on hybrid cascaded HVDC system is presently in its initial phases. Current research largely concentrates on investigating the impact of MMC on reactive power support and improving the voltage dependent current order limitation (VDCOL) curve in order to address commutation failures and power recovery, without proposing corresponding coordinated control strategies from the perspective of balancing reactive power interaction and rapid power recovery. There is a lack of safe operating range of the system and in-depth research on the key issue of subsequent commutation failures. Thus, this paper proposes a coordinated control method utilizing MMC and VDCOL to effectively address both the mitigation of subsequent commutation failures and the rapid and stable restoration of power in hybrid cascaded HVDC system.
Firstly, the adverse effects of AC bus voltage phase advance on the inverter side during controller interaction and the reactive power demand of the LCC converter during VDOCL operation on system recovery were analyzed. Based on the consideration of the controller and MMC dynamic reactive power support, the fault security region of the hybrid cascaded HVDC system under the coupling of multiple electrical quantities on the inverter side was quantitatively established.
Secondly, by comparing and analyzing the fault security region of the hybrid cascaded HVDC system and LCC-HVDC, a coordinated control strategy based on MMC and VDCOL is proposed. While fully utilizing the dynamic reactive power support capability of MMC, the VDCOL curve is adjusted in real-time based on current deviation, achieving coordination between subsequent commutation failure suppression and rapid and stable power recovery of the system.
Finally, a simulation comparative analysis was conducted based on PSCAD/EMTDC under different severity AC faults, different short circuit ratios, and different fault durations to verify the effectiveness of the proposed coordinated control strategy and the variation of active power transmitted to the receiving power grid is the main influencing factor for the generation of AC bus voltage phase advance. The simulation results show that compared to the coordinated control strategy without input and the reactive power control strategy with only input, the coordinated control strategy based on MMC and VDCOL proposed in this paper can not only effectively suppress subsequent commutation failures in hybrid cascaded HVDC system, but also achieve fast and stable power recovery, reduce the fluctuation of various electrical quantities during system faults, and accelerate the recovery process of the system. The increase of active power can be up to 109.61% under severe faults, which has obvious advantages and certain engineering application values.
Key wordsHybrid cascaded HVDC system    subsequent commutation failure    fault recovery period    fault security region    corrdinated control strategy   
收稿日期: 2023-08-14     
PACS: TM72  
基金资助:国家自然科学基金资助项目(52207077)
通讯作者: 边 竞 男,1994年生,讲师,硕士生导师,研究方向为柔性直流输电系统建模与仿真。E-mail:bj_jjj@163.com   
作者简介: 王 鹤 男,1983年生,教授,博士生导师,研究方向为柔性直流输电、新能源发电以及电力系统通信。E-mail:wanghe_nedu@163.com
引用本文:   
王鹤, 郭家治, 边竞, 李国庆, 王拓. 基于故障安全域的混合级联直流输电系统后续换相失败抑制策略[J]. 电工技术学报, 2024, 39(5): 1352-1371. Wang He, Guo Jiazhi, Bian Jing, Li Guoqing, Wang Tuo. Subsequent Commutation Failure Suppression Strategy for Hybrid Cascaded HVDC System Based on Fault Security Region. Transactions of China Electrotechnical Society, 2024, 39(5): 1352-1371.
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