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1.电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市 710049
2.中原工学院电子信息学院,河南省郑州市 450007
3.郑州轻工业大学电气信息工程学院,河南省郑州市 450002
尹太元(1989—),男,博士研究生,主要研究方向:柔性直流输电系统的建模与稳定性分析。E-mail:yintaiyuan945@126.com
王跃(1972—),男,通信作者,博士,教授,博士生导师,主要研究方向:大功率电能变化。E-mail:davidwangyue@mail.xjtu.edu.cn
王晓雷(1963—),男,博士,教授,硕士生导师,主要研究方向:大功率电能变换与智能电网。E-mail:www.218@126.com
收稿日期:2021-04-30,
修回日期:2022-02-24,
网络出版日期:2022-04-25,
纸质出版日期:2022-05-25
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尹太元,王跃,王晓雷等.正负序电流环对柔直系统交流阻抗波动特性影响机理分析[J].电力系统自动化,2022,46(10):149-158.
YIN Taiyuan,WANG Yue,WANG Xiaolei,et al.Analysis of Influence Mechanism of Positive-Negative Sequence Current Control Loops on AC Impedance Fluctuation Characteristics of HVDC System[J].Automation of Electric Power Systems,2022,46(10):149-158.
尹太元,王跃,王晓雷等.正负序电流环对柔直系统交流阻抗波动特性影响机理分析[J].电力系统自动化,2022,46(10):149-158. DOI: 10.7500/AEPS20210430024.
YIN Taiyuan,WANG Yue,WANG Xiaolei,et al.Analysis of Influence Mechanism of Positive-Negative Sequence Current Control Loops on AC Impedance Fluctuation Characteristics of HVDC System[J].Automation of Electric Power Systems,2022,46(10):149-158. DOI: 10.7500/AEPS20210430024.
柔性直流输电系统广泛采用阻抗分析法研究其稳定性问题,模块化多电平换流器(MMC)的阻抗模型是应用该分析方法的基础。在实际工程中,正负序电流控制环和序分离算法是MMC控制系统的重要组成部分。研究表明,当采用基于延时对消的正负序分离算法时,柔性直流输电系统的交流阻抗会出现规律性波动现象,但目前对该波动现象的机理研究尚不充分。首先,在考虑正负序电流控制环和序分离算法的前提下推导了MMC的详细阻抗模型,展现了阻抗波动现象,进而研究了正负序电流环控制器参数的不一致性对该波动特性的影响。其次,推导了MMC的简化阻抗模型并验证了利用该模型分析阻抗波动现象的合理性。基于该简化模型,从理论上分析了阻抗波动现象的产生机理,并从理论上研究了交流阻抗波动会随着正负序电流环控制器参数不一致性的增加而进一步加剧的影响机理。最后,通过实验验证了上述理论分析的正确性。
Impedance analysis method is widely used to study the stability of modular multilevel converter based high voltage direct current transmission (MMC-HVDC) system. The impedance model of modular multilevel converter (MMC) is the basis of the application of this analysis method. In the practical engineering
the positive-negative sequence current control loops and the sequence separation algorithm are the important components of the MMC control system. The research shows that when the delay-cancellation based positive-negative sequence separation algorithm is adopted
the AC impedance of the MMC-HVDC system will fluctuate regularly. However
the mechanism of this fluctuation phenomenon is not fully studied at present. Firstly
considering the positive-negative sequence current control loops and the sequence separation algorithm
this paper deduces the detailed impedance model of MMC
reproduces the impedance fluctuation phenomenon
and then studies the influence of the inconsistency of controller parameters of positive-negative sequence current loop on the fluctuation characteristics. Secondly
the simplified impedance model of MMC is deduced and the rationality of using this model to analyze the impedance fluctuation phenomenon is verified. Based on the simplified model
the generation mechanism of impedance fluctuation phenomenon is analyzed theoretically
and the influence mechanism on the aggravation of AC impedance fluctuation with the increase of the inconsistency of controller parameters of positive-negative sequence current loop is studied theoretically. Finally
experiments verify the correctness of the above theoretical analysis.
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