基于dq变换的幅频调制激励下振荡功率振幅解析计算及特征分析  

Analytical Calculation and Characteristic Analysis of Oscillation Power Amplitude Excited by Amplitude-frequency Modulation Based on dq Transformation

作　　者：王德胜 刘辉 吴林林 王潇 邓晓洋 苏田宇 WANG Desheng;LUI Hui;WU Linlin;WANG Xiao;DENG Xiaoyang;SU Tianyu(State Grid Jibei Electric Co.,Ltd.Research Institution(North China Electric Power Research Institution Co.,Ltd.),Xicheng District,Beijing 100045,China)

机构地区：[1]国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司),北京市西城区100045

出　　处：《中国电机工程学报》2024年第20期8258-8269,I0028,共13页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

摘　　要：高比例电力电子设备并网在提升系统电能变换灵活性的同时,也引入了形态各异的多特征振荡问题。然而现有研究大多关注振荡的宏观成因,鲜有对精确提取振荡信息及振荡功率解析计算的研究。为此,以近期一现场等幅振荡事件为切入点,提出一种基于dq变换的幅频调制激励下振荡功率振幅分析方法。首先,凝练该次事件中等幅振荡的波形特性,阐明现有方法在提取振荡分量时直接进行离散傅里叶分解的不足,提出基于dq变换的幅频调制信号分解方法和基于锁相环的幅频调制信号测量方法;然后,计算幅值和频率激励信号,进而完成振荡有功和无功功率计算,给出功率的解析表达式,解释振荡特性;最后,所提方法不仅能弥补传统信号分解方法物理意义不清晰的缺陷,还能明确体现振荡的幅频本质及线路不同元件对振荡功率的参与过程,为振荡分析及抑制工作提供参考。The high proportion of power electronic equipment connected to the grid not only improves the flexibility of power conversion,but also introduces the multi-feature oscillation problem of different forms.However,most of the existing researches focus solely on the macroscopic causes of oscillation,and there are few studies on the accurate extraction of oscillation information and the analytical calculation of oscillation power.Based on a recent field constant amplitude oscillation event,a steady state analysis method for AC circuits under amplitude-frequency modulation excitation based on dq transformation is proposed.First,the waveform characteristics of the medium amplitude oscillation of the event are described,and the shortcomings of the existing methods in extracting the oscillation components directly by discrete Fourier decomposition are explained.The decomposition method of amplitude frequency modulation signal based on dq transform and the measurement method of amplitude frequency modulation signal based on PLL are proposed.Then,the amplitude and frequency excitation signals are calculated to complete the calculation of the active and reactive power of the oscillation,and the analytical expression of the power is given to explain the characteristics of the oscillation waveform.Finally,the proposed method can not only make up for the lack of clear physical meaning of the traditional signal decomposition method,but also clearly reflect the amplitude-frequency nature of oscillation and the influence process of different components on the oscillation power,so as to provide a reference for the analysis and suppression of oscillation.

关 键 词：瞬时功率 等幅振荡 dq变换 幅值/频率调制 锁相环 

分 类 号：TM464[电气工程—电器]