摘要
针对电网异常时,很多现有方法不能有效地检测出电网幅值和相位,为有效地检测电网异常时电网电压的幅值和相位,提出了基于自适应带通滤波器的分序算法,用该分序算法提取电网正序基波电压,正序基波电压被变换到旋转坐标系中后,分析了正序基波电压的幅值和电网相位之间的关系,据此建立了幅相检测系统的数学模型和控制模型,用根轨迹法分析了幅相检测系统的稳定性和稳定裕度。为了有效提高了相位检测精度和缩短系统的暂态过程,在控制结构中,把电网正序电压的q轴分量直接前馈。仿真和实验结果表明,提出检测方法能有效地检测电压异常时电网的幅值和相位,并且检测系统的暂态过程缩短到0.01 s以内。
According to the abnormal grid, the grid＇s phasor and amplitude can＇t be detected effectively in the pre-sent methods. To correctively detect the asymmetry grid＇s phasor and amplitude, a self-adaptive band pass filter based on the second order general integral is proposed to extract the positive voltage component. The positive sequence component of grid＇s voltage is transformed to the synchronous rotating frame. The relationship between the positive sequence funda-mental harmonic voltage and the grid＇s phasor is analyzed. The mathematical model and the control model of the proposed detection system are modeled by the relationship, and the stability and stability margin of the detecting system are ana- lyzed. To improve detection precision and shorten transient processes, the component in q axis is forwarded directly to the output of the control model. The simulation results and experimental results verify that the proposed amplitude and phase method is corrective and feasible, and a transient process of the detecting system is shortened to 0.01s.
出处
《电子测量与仪器学报》
CSCD
2012年第9期782-788,共7页
Journal of Electronic Measurement and Instrumentation
基金
湖北省教育厅科学技术研究(编号:B20122506)资助项目
湖北文理学院科研(编号:2010YA016)资助项目
关键词
幅相检测方法
自适应带通滤波器
分序算法
amplitude and phase detecting method
self-adaptive band pass filter
decomposing sequence algorithm
