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电工材料电气绝缘全国重点实验室(西安交通大学),陕西省西安市 710049
姜鑫(1998—),男,博士研究生,主要研究方向:变流器稳定性分析与控制。E-mail:xinjiang_work@163.com
易皓(1984—),男,通信作者,博士,副教授,博士生导师,主要研究方向:电能质量治理、分布式能源控制、并网变流器建模与控制。E-mail:yi_hao@mail.xjtu.edu.cn
卓放(1962—),男,博士,教授,博士生导师,主要研究方向:电能质量治理、有源电力滤波器、新能源并网发电技术。E-mail:zffz@mail.xjtu.edu.cn
收稿:2023-08-26,
修回:2023-10-19,
网络出版:2024-04-26,
纸质出版:2024-08-25
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姜鑫,易皓,卓放等.基于直流电压同步的构网型变流器低频振荡分析与阻尼控制[J].电力系统自动化,2024,48(16):30-39.
JIANG Xin,YI Hao,ZHUO Fang,et al.Low-frequency Oscillation Analysis and Damping Control for Grid-forming Converters Based on DC Voltage Synchronization[J].Automation of Electric Power Systems,2024,48(16):30-39.
姜鑫,易皓,卓放等.基于直流电压同步的构网型变流器低频振荡分析与阻尼控制[J].电力系统自动化,2024,48(16):30-39. DOI: 10.7500/AEPS20230826001.
JIANG Xin,YI Hao,ZHUO Fang,et al.Low-frequency Oscillation Analysis and Damping Control for Grid-forming Converters Based on DC Voltage Synchronization[J].Automation of Electric Power Systems,2024,48(16):30-39. DOI: 10.7500/AEPS20230826001.
基于直流电压同步的构网型变流器能够在稳定直流侧电压的同时实现变流器自同步,然而直流电压动态与控制环相互作用可能会引起系统低频振荡。为了研究低频振荡产生的机理,建立了计及直流电压同步控制环与交流电压环的构网型变流器“功率-功角”稳定性分析模型,分析发现直流电压同步相比于功率同步会引入更多的相位滞后,同时交流电压环也会在环路中引入相位滞后,导致系统环路增益在具有高幅值的低频范围内存在-180°相位穿越,进而引发低频振荡问题。基于低频振荡机理分析,提出两种对直流电压同步控制进行相位补偿的方法,通过重塑系统环路低频高增益区的相位,实现对低频段的阻尼控制和振荡抑制。最后,通过仿真和实验验证了理论分析的正确性和所提方法的有效性。
The grid-forming converters based on DC voltage synchronization cannot only stabilize DC voltage but also realize the self-synchronization of converters. However
the interaction between DC voltage dynamics and control loops may cause low-frequency oscillation of the system. To study the mechanism of low-frequency oscillation
the “active power-power angle” model for stability analysis is built with consideration of the DC voltage synchronization control loop and AC voltage loop. It is found that DC voltage synchronization introduces more phase lag compared with active power synchronization
while the AC voltage loop also introduces phase lag in the loop. As a result
the system loop gain has the -180° phase crossing in the low frequency range with a high magnitude
thereby triggering the low-frequency oscillation issues. Based on the analysis of the low-frequency oscillation mechanism
two phase compensation methods for DC voltage synchronization control are proposed. Through reshaping the system loop phase in the high-gain-amplitude area of the low-frequency range
the damping control and oscillation suppression in the low-frequency range can be realized. Finally
the simulation and the experiment verify the correctness of the theoretical analysis and the effectiveness of the proposed methods.
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