[关键词]
[摘要]
传统基于DFT的功率测量算法需要基于电流DFT的结果得到电流基波向量的相位与幅值,进而结合锁相环中得到的相电压基波向量的相位和幅值进行运算,运算量庞大。介绍一种简化的功率计算方法,通过选取合适的电流DFT起始点,可以直接通过电流DFT结果的实部、虚部与相电压幅值得到有功功率和无功功率,极大缩减计算量,减小DSP的计算压力。通过Simulink对上述计算方法进行仿真分析,对比仿真结果与理论计算所得的结果,最终验证了算法的可行性和有效性。
[Key word]
[Abstract]
The traditional power measurement algorithm based on DFT needs to obtain the phase and amplitude of the current fundamental wave vector according to the result of current’s DFT, and then the operation would be performed according to the phase and amplitude of the phasevoltage fundamental wave vector obtained in phaselocked loop.Introduce a simplified power measurement algorithm. The real part and imaginary part of the current DFT’s resultcan be used with the phase voltage amplitude to get the active power and reactive power by selecting proper starting point of DFT, which would reduce the amount of calculation and the pressure of DSP. The algorithm was simulated through Simulink software. The compare ofresults obtained by simulation and theoretical calculation proved the feasibility and availability of the algorithm.
[中图分类号]
TM 933.3
[基金项目]