引用本文: | 魏 亮,王渝红,李兴源,黎东祥,刘霄涵,汤 华.高压直流输电送端孤岛运行附加频率控制器设计[J].电力自动化设备,2016,36(1): |
| WEI Liang,WANG Yuhong,LI Xingyuan,LI Dongxiang,LIU Xiaohan,TANG Hua.Design of additional frequency controller for islanded sending-end operation of HVDC system[J].Electric Power Automation Equipment,2016,36(1): |
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摘要: |
高压直流输电系统在孤岛运行方式下,由于缺少负荷的频率调节效应,交、直流系统的扰动极易造成送端系统频率的不稳定。采用TLS-ESPRIT算法辨识出某实际电网系统的传递函数,并根据根轨迹校正原则设计了一种直流系统附加频率控制器,利用直流输电系统功率的快速可控性,来稳定送端系统频率。同时,设计了传统比例积分控制器与所提控制器进行比较。在PSCAD/EMTDC中仿真结果表明,所设计的频率附加控制器可以有效地提高孤岛系统的频率稳定性。 |
关键词: 高压直流输电 孤岛运行 频率稳定 根轨迹校正 附加频率控制 |
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基金项目:国家自然科学基金重点资助项目(51037003);国家电网公司大电网重大专项资助项目课题(SGCC-MPLG001- 027-2012) |
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Design of additional frequency controller for islanded sending-end operation of HVDC system |
WEI Liang,WANG Yuhong,LI Xingyuan,LI Dongxiang,LIU Xiaohan,TANG Hua
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School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China
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Abstract: |
Due to the lack of load frequency modulation effect in the islanding mode of HVDC system operation,the disturbance of AC/DC system may easily lead to system frequency instability. TLS-ESPRIT algorithm is applied to identify the transfer function of a real power system and an additional frequency controller is designed based on the root-locus approach,which utilizes the fast controllability of HVDC system power to stabilize the frequency of its sending-end AC system. A traditional PI controller is also designed and compared with the additional frequency controller by PSCAD/EMTDC simulation,and the results show the designed additional frequency controller enhances the frequency stability of islanded system effectively. |
Key words: HVDC power transmission islanded operation frequency stability root-locus approach additional frequency control |