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异步联网下直流频率调制及其参数对送端系统频率的影响
高原1, 马宁宁1, 王德林1, 孙宁杰1, 周鑫2, 吴水军3, 和鹏2
1.西南交通大学 电气工程学院,四川 成都 610031;2.云南电网有限责任公司电力科学研究院,云南 昆明 650217;3.云南电力试验研究院(集团)有限公司,云南 昆明 650217
摘要:
考虑原动机调速器及直流频率调制的作用,基于直流潮流法以解析形式推导出在直流频率调制影响下送端系统的频率响应以及调频系统的阻尼比,并在此基础上研究了直流频率调制参与调频及其调频参数对送端系统频率动态特性的影响。最后,分析了异步联网条件下直流频率调制在参与含水电机组的送端系统中,对系统频率变化特性的影响。选取实际云南电网楚穗直流输电工程对所提方法进行仿真,仿真结果验证了直流频率调制抑制送端系统扰动频率峰值的有效性,同时证明了其参与水电调频后可以维持送端系统频率的稳定性。
关键词:  异步联网  频率调制  直流输电  直流频率限制器  阻尼比
DOI:10.16081/j.epae.201909053
分类号:TM721;TM761+.2
基金项目:国家自然科学基金资助项目(51477143);中国南方电网云南科技项目(K-YNKJXM-20160159)
Impact of DC frequency modulation and modulation parameters on frequency characteristics of sending end in asynchronous interconnected power grid
GAO Yuan1, MA Ningning1, WANG Delin1, SUN Ningjie1, ZHOU Xin2, WU Shuijun3, HE Peng2
1.School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China;2.Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217, China;3.Yunnan Electric Power Test & Research Institute(Group) Co.,Ltd.,Kunming 650217, China
Abstract:
Based on DC(Direct Current) load flow method, the analytical expression of frequency response in sending end and damping ratio in FM(Frequency Modulation) system under the impact of DC FM are deduced in consideration of the function of hydro-turbine governor and DC FM. Then the frequency dynamic characteristics of sending end are studied, when the DC FM and the FM parameters is involved. Finally, the impact of DC FM on frequency changing characteristics in sending end with hydroelectric generators is analyzed under the asynchronous grid interconnection condition. A test system of Chuxiong-Suidong DC transmission project is established, which the simulative result verifies that DC FM method can not only suppress the peak disturbance frequency of the sending end effectively, but also maintain the frequency stability of sending end after participating in hydropower system FM.
Key words:  asynchronous interconnection  frequency modulation  DC power transmission  DC frequency limit Controller  damping ratio

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