基于Rife-Vincent自卷积窗插值校正的发电机准同期参量测量方法

Generator Quasi Synchronization Parameter Measurement Method Based on Rife-Vincent Self-Convolution Window and Interpolation Correction

对准同期参量进行精确快速测量是发电机准同期并列成功的关键。非同步采样时,基于谐波分析理论的准同期参量测量结果会产生较大误差,为此提出了基于Rife-Vincent自卷积窗插值校正的发电机准同期参量测量方法。分析了Rife-Vincent自卷积窗主瓣特性以及自卷积阶数对旁瓣性能的影响,同时给出了基于Rife-Vincent自卷积窗的插值频谱校正方法。通过仿真计算,得到了基波频率波动、谐波影响、噪声影响等不同情况下发电机准同期参量测量结果;同时对电压非稳态情况进行了仿真,分析了误差产生原因。仿真结果表明所提方法性能优越,能有效抑制频谱泄露效应。

It is the core task for automatic synchronization device to estimate the generator quasi synchronization parameter rapidly and precisely. However, when measuring the parameter based on harmonic analysis method, the result will have a great error because of non-synchronization sampling. To reduce this error, a generator quasi synchronization parameter measurement method based on Rife-Vincent self-convolution window （RVSCW） and interpolation correction was presented. The main lobe characteristic and the relationships between side-lobe characteristic and the order of self-convolution were analyzed. Besides, interpolation spectrum correction theory based on RVSCW was given as well. In the situations of fundamental frequency fluctuation, harmonic and white noise existence, the parameter was calculated. What＇s more, taking the voltage as non-stationary signal, the parameter was calculated and the causes of error were analyzed as well. Simulation results show that the method presented in this paper has superior performance, which can inhibit spectrum leakage effectively.