合肥工业大学电气与自动化工程学院,安徽省合肥市 230009
黄海宏(1973—),男,博士,教授,主要研究方向:新型大功率变流技术与新能源发电系统建模与控制等。E-mail:hhaihong741@126.com
汪光亚(1995—),男,通信作者,博士研究生,主要研究方向:新能源发电系统建模与控制等。E-mail:wangguangya903@163.com
王海欣(1976—),女,高级实验师,主要研究方向:数字信号处理器的应用技术等。E-mail:w_haixin@126.com
收稿:2025-03-12,
修回:2025-05-06,
网络首发:2025-08-13,
纸质出版:2025-11-10
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黄海宏,汪光亚,王海欣.基于准谐波压降前馈的虚拟同步机并网电流谐波抑制方法[J].电力系统自动化,2025,49(21):171-183.
HUANG Haihong,WANG Guangya,WANG Haixin.Harmonic Current Suppression Method for Grid-connected Virtual Synchronous Generator Based on Quasi-harmonic Voltage Drop Feedforward[J].Automation of Electric Power Systems,2025,49(21):171-183.
黄海宏,汪光亚,王海欣.基于准谐波压降前馈的虚拟同步机并网电流谐波抑制方法[J].电力系统自动化,2025,49(21):171-183. DOI: 10.7500/AEPS20250312004.
HUANG Haihong,WANG Guangya,WANG Haixin.Harmonic Current Suppression Method for Grid-connected Virtual Synchronous Generator Based on Quasi-harmonic Voltage Drop Feedforward[J].Automation of Electric Power Systems,2025,49(21):171-183. DOI: 10.7500/AEPS20250312004.
针对电网背景谐波导致虚拟同步机并网电流质量不佳的问题,提出一种基于准谐波压降前馈的控制方法抑制并网电流谐波。首先,通过建立虚拟同步机序阻抗模型,分析电网背景谐波对虚拟同步机并网电流的影响机理,提出一种无须设计滤波器及复杂控制器的谐波抑制方法,且谐波抑制效果不易受电网频率波动影响。然后,根据公共耦合点处电压与电网电压,得到网侧滤波电感上的实际压降,再结合计算出的理想基波压降,得到准谐波压降,并通过前馈因子进行适当前馈,实现准谐波阻抗重塑。基于小信号模型分析了该方法对于系统稳定性的影响。最后,通过实验验证了所提控制方法的正确性和有效性。
Aiming at the problem of poor grid-connected current quality of virtual synchronous generator (VSG) caused by background harmonics of the power grid
this paper proposes a method for suppressing the harmonics of the grid-connected current based on quasi-harmonic voltage drop feedforward. First
by establishing the sequence impedance model of the VSG
the influence mechanism of background harmonics in the power grid on the grid-connected current of the VSG is analyzed. A harmonic suppression method is proposed that requires neither filter design nor complex controllers
whose suppression effect is minimally affected by power grid frequency fluctuations. Then
the actual voltage drop on the grid-side filter inductor is calculated based on the voltage at the point of common coupling and the power grid voltage. Combined with the ideal fundamental voltage drop
the quasi-harmonic voltage drop is obtained. The quasi-harmonic impedance is reshaped by appropriate feedforward with the feedforward factor. Furthermore
based on the small-signal model
the influence of this method on the system stability is analyzed. The correctness and effectiveness of the proposed control method are verified through experiments.
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