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1.直流输电技术国家重点实验室(中国南方电网科学研究院有限责任公司),广东省广州市 510663
2.中国南方电网有限责任公司,广东省广州市 510663
冯俊杰(1994—),男,硕士,主要研究方向:柔性直流输配电与电能质量分析。E-mail:fengjj@csg.cn
傅闯(1973—),男,通信作者,博士,教授级高级工程师,主要研究方向:高压直流输电技术。E-mail:fuchuang@csg.cn
邹常跃(1989—),男,博士,主要研究方向:高压柔性直流输电技术、电力电子技术。E-mail:zoucy@csg.cn
收稿:2021-07-19,
修回:2021-09-15,
网络出版:2022-01-04,
纸质出版:2022-02-25
移动端阅览
冯俊杰,傅闯,邹常跃等.V/f控制下柔性直流换流器阻抗建模及中高频谐振特性分析[J].电力系统自动化,2022,46(4):143-152.
FENG Junjie,FU Chuang,ZOU Changyue,et al.Impedance Modeling and Mid- and High-frequency Resonance Characteristic Analysis for Flexible DC Converter with V/f Control[J].Automation of Electric Power Systems,2022,46(4):143-152.
冯俊杰,傅闯,邹常跃等.V/f控制下柔性直流换流器阻抗建模及中高频谐振特性分析[J].电力系统自动化,2022,46(4):143-152. DOI: 10.7500/AEPS20210719003.
FENG Junjie,FU Chuang,ZOU Changyue,et al.Impedance Modeling and Mid- and High-frequency Resonance Characteristic Analysis for Flexible DC Converter with V/f Control[J].Automation of Electric Power Systems,2022,46(4):143-152. DOI: 10.7500/AEPS20210719003.
为研究交流侧电压控制,即
V
/
f
控制下柔性直流输电系统的中高频谐振问题
考虑正负序交流电压和电流内外环、电压前馈以及系统调制与控制链路延时等环节的作用,采用谐波线性化的方法建立了柔性直流换流器的交流侧正负序等效阻抗模型;分析了交流电压控制方式、电压前馈控制方式、控制系统参数、链路延时大小等因素对
V
/
f
控制下柔性直流换流器中高频阻抗特性的影响;通过对控制系统结构和参数进行优化,提出了柔性直流换流器中高频等效阻抗的改善措施,抑制换流器负阻尼。以66 kV交流汇集的海上风电柔性直流送出系统为例,分析了柔性直流换流器对系统中高频谐振特性的影响。最后,分别通过阻抗扫描和电磁暂态仿真验证了等效阻抗模型的正确性和阻抗改善措施的有效性。
In order to study mid- and high-frequency resonance problems of flexible DC transmission systems with AC-side voltage control
i.e.
V
/
f
control
the AC-side positive and negative sequence equivalent impedance model of flexible DC converter is established by means of harmonic linearization considering the functions of positive and negative sequence AC voltage and current loop
voltage feedforward
system modulation and control link delay. Then
the influence of AC voltage control mode
voltage feedforward control mode
control system parameters and link delay on the mid- and high-frequency impedance characteristics of flexible DC converter with
V
/
f
control is analyzed. By optimizing the control system structure and parameters
the improvement measures on mid- and high-frequency equivalent impedance of flexible DC converter are proposed to suppress the negative damping of converters. Taking a flexible DC delivery system for a 66 kV offshore wind farm as an example
the influence of flexible DC converter on the mid- and high-frequency resonance characteristics is analyzed. Finally
the correctness of the equivalent impedance model and the effectiveness of impedance improvement measures are verified by impedance scanning and electromagnetic transient simulation
respectively.
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