The design of harmonic measurement instrument with DSP based on wavelet transform
摘要:介绍了基于瞬时无功功率理论的小波变换算法。通过在采样间隔里,每采样一个新的数据,就进行算法运算,可实时运算电力谐波和无功电流,这种算法比把所有或者一部分点都准备好后才进行运算的算法更实时,效率更高。最后描述了采用TMS320VC5402和AT89C51等电路实现了上述测量算法的硬件设计与软件设计过程及结果。
关键词: DSP;谐波; 实时;小波变换
Abstract: In this paper, The wavelet transform theory based on the instananeous reative power is presents.The harmonic and reative current can be computed with the algorithm during the sampling interval. the algorithm is more efficient than the conventional algorithm that all datas are computed after they are all sampled.then, the principle of designing the harmonic and reative current measurement instrument to implement the algorithm by using DSP and MCU devices is described.
Key Words: DSP; Harmonic;real ;wavelet
0 引言
现在很多的谐波检测仪都是先在一个工频内测出N个点,然后进行算法运算,得到所需的数据。本文在讨论基于瞬时无功功率理论的小波变换算法的基础上,介绍了采用 TI公司的TMS320VC5402和AT89C51等集成电路设计谐波功率测量仪的方法。这种测量仪能在采样间隔里,每采样一个新的数据,就进行算法运算,能满足电力系统中对谐波和无功电流的快速、实时、高精度的测量要求。
1基于瞬时无功功率理论的小波变换算法