电压源型换流器多端直流输电系统的阶梯控制策略研究
摘要：基于多端直流输电系统的结构和电压源型换流器的控制原理, 设计了适于VSC-MT-DC系统的阶梯控制算法, 保证若线路或者换流站故障, 其中一端退出运行时系统能够迅速恢复稳定运行。基于PSCAD/EMTDC建立四端VSC-MTDC输电系统模型, 每端的三相电压源通过换流站连接高压直流输电线路, 四个换流端采用并联接线方式。仿真验证阶梯控制有效性, 并进行功率提升实验和故障仿真验证阶梯控制的可行性。
关键词：VSC-MTDC 阶梯控制 故障 仿真
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[3]陈谦, 唐国庆, 潘诗锋.采用多点直流电压控制方式的VSC多端直流输电系统[J].电力自动化设备, 2004, 24 (5) :10-14.
[4]Hongbo Jiang;Ekstrom, Ake, Multiterminal HVDC systems in urban areas of large cities[J].Power Delivery IEEE Transactions on, 1998, 13 (4) :1278-1284.
[5]Sakamoto, K.;Yajima, M.;Ishikawa, T.;Sugimoto, S.;Sato, T.;Abe, H., Development of a control system for a highperformance self-commutated AC/DC converter[J].Power Delivery IEEE Transactions on, 1998, 13 (1) :225-232.
[6]Seki, N., Field testing of 53 MVA three-terminal DC link between power systems using GTO converters[J].Power Engineering Society Winter Meeting, 2000, 4 (4) :2504-2508.
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[9] 陈谦.新型多端直流输电的运行与控制[D].东南大学.
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[12]丁涛, 张承学, 孙元博.基于本地信号的VSC-MTDC输电系统控制策略[J].电力系统自动化, 2010, 34 (9) :44-48.
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Research of Step-control Strategy for VSC-MTDC
Abstract: Based on structure of multi-terminal HVDC transmission and control theory of voltage-source converter, a new step-control strategy for VSC-MTDC is designed, which could restore system stability rapidly when line or converter station fault get one terminal out of operation.The model of four-terminal VSC-MTDC is built based on PSCAD-EMT-DC.Three-phase voltage source of each terminal is connected to high voltage dc line through converter station, and four terminals are parallel-connection.The new step-control effectiveness is verified via simulation.Moreover, power-step and ground fault tests prove this control strategy is feasible.
Keywords: VSC-MTDC; step-control; fault; simulation;
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