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电能质量扰动的参数估计是电能质量分析的重要内容之一,可为电能质量的控制与管理提供定量参考信息。该文提出了基于电量参数分析的扰动参数估计方法。从电量参数的角度将电能质量扰动划分为3类,在时域中构造了3个物理意义明确、不受其他扰动影响的特征量。这3个特征量可对扰动进行参数估计,且计算量小、抗噪性强。可估计的参数有谐波总畸变率、电压波动周期及波动值、电压下跌的起止时刻和下跌幅度、振荡暂态的起始时刻及振荡参数、切痕的深度与时间的乘积。对于混合扰动,可估计下跌与谐波、波动与谐波、谐波与振荡暂态、下跌与切痕的主要参数,且其估计精度与单一扰动接近。仿真结果验证了该方法的有效性。
The parameter estimation of power quality disturbance is one of the important contents of power quality analysis, which can provide quantitative reference information for power quality control and management. In this paper, a disturbance parameter estimation method based on power parameter analysis is proposed. The power quality disturbances are divided into three categories from the perspective of power parameters, and three feature quantities with definite physical meaning and no other disturbances are constructed in the time domain. These three characteristic parameters can estimate the parameters of the disturbance, and the calculation is small, strong anti-noise. Estimated parameters include the total harmonic distortion rate, the period and fluctuation of voltage fluctuations, the start and end points and the fall of voltage drops, the initial moments and oscillation parameters of oscillation transients, the depth of cuts and the product of time. For mixed disturbances, the main parameters of decline and harmonics, fluctuations and harmonics, harmonics and oscillation transients, declines and cuts can be estimated and their estimation accuracy is close to that of a single disturbance. Simulation results verify the effectiveness of this method.