基于改进二阶广义积分器的交流 电压幅值检测方法
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新疆大学电气工程学院

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TM734

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国家重点研发计划(2021YFB1507005)


Voltage amplitude detection method based on improved second-order generalized integrator
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School of Electrical Engineering, Xinjiang University

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    摘要:

    在对电压幅值检测精度要求逐年增高的背景下,针对现有电压幅值检测方法易受谐波分量与直流分量干扰,进而导致检测精度不足的问题,提出了基于改进二阶广义积分器的电压幅值检测方法。首先,分析了故障后电压的成分变化,证明了故障电压中谐波分量与直流分量的存在,随后分析了正余弦分量法与传统二阶广义积分法的电压幅值检测原理与性能,然后将传统二阶广义积分器中不含直流分量的输出量作为第二个模块的输入量,从而实现对直流分量的有效滤除,并对改进二阶广义积分器在不同增益系数下伯德图、零极点与阶跃响应进行分析,综合考虑滤波效果、稳定性与响应速度等因素的影响,选取了最优增益系数。最后进行仿真验证,结果表明本章所提方法相较于其他两种方法,具有更强的谐波、直流分量滤除能力与更高的精度。

    Abstract:

    Under the background that the accuracy of voltage amplitude detection is increasing year by year, a voltage amplitude detection method based on improved second-order generalized integrator is proposed to solve the problem that the existing voltage amplitude detection methods are susceptible to the interference of harmonic and DC components, which leads to insufficient detection accuracy. First, the composition change of voltage after fault is analyzed, and the existence of harmonic component and DC component in fault voltage is proved. Then, the principle and performance of voltage amplitude detection by sine-cosine component method and traditional second-order generalized integral method are analyzed. Then, the output of traditional second-order generalized integrator without DC component is taken as the input of the second module. In this way, the effective filtering of the DC component is realized, and the Bode diagram, zero pole and step response of the improved second-order generalized integrator under different gain coefficients are analyzed. The optimal gain coefficient is selected considering the influence of filtering effect, stability and response speed. Finally, the simulation results show that the method proposed in this chapter has stronger filtering ability and higher precision than the other two methods.

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王宇飞,王海云,武家辉. 基于改进二阶广义积分器的交流 电压幅值检测方法[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-06
  • 最后修改日期:2024-05-07
  • 录用日期:2024-05-22
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