基于无延时FIR滤波器的电网电压锁相方法研究  

Research on power grid voltage phase locked method based on no delay FIR filter

作　　者：彭书涛[1] 李小腾[1] 张小庆[1] 

机构地区：[1]陕西电力科学研究院,陕西西安710054

出　　处：《西安理工大学学报》2015年第4期482-486,共5页Journal of Xi'an University of Technology

基　　金：陕西省科技计划资助项目(2013KW05-02)

摘　　要：为了解决由于电网电压被噪声污染而难以准确实时检测出过零点的问题,提高电网电压过零锁相精度,提出一种基于无延时有限脉冲响应(FIR)滤波器的电网电压过零鉴相锁相方法。该方法可以抑制噪声,消除"虚假过零点",并且滤波后无相位延迟,不需要进行额外的相位补偿,方法简单。在含有噪声和非理想电网电压工况下的仿真表明了算法能够精确检测电网电压过零点,得到电网电压相位信息;基于TMS320F28335DSP的电网测量实验结果表明,算法在实际应用中能够满足实时性要求,准确检测相位信息。The zero crossing points are always difficult to be detected in real-time manner because the grid voltages are polluted by noises,in order to solve the problem and to improve the zero crossing point locking precision,agrid voltage zero crossing point locking method based on the no delay FIR filter is proposed in this paper.The noise effect can be effectively suppressed,and the ＂false zero crossing points＂ is avoided by this method,furthermore,there is no phase delay after filtering,and the additional phase compensation is not needed anymore.The proposed method is simple,and the zero crossing points of the grid voltages can be accurately detected,and the phase of the grid voltage can be obtained.Simulation and experiment results show that,even under the non-ideal grid voltage operational conditions,the proposed algorithm can detect the grid voltage phase information precisely.The experiments of grid measurement based on TMS320F28335 DSP indicate that the algorithm in practical applications is able to satisfy the real-time requirement to detect the phase information accurately.

关 键 词：锁相 无延时有限脉冲响应滤波器 电网电压过零检测 

分 类 号：TP273.2[自动化与计算机技术—检测技术与自动化装置]