瞬态能量冲击对同步测量影响的分析估算及其抑制

操作过电压、雷电过电压等瞬态能量冲击干扰具有广谱性质,经电力系统特性滤波后会形成衰减的谐振干扰.分析了这类干扰对同步测量的影响,详细推导了测量数据受扰程度的表达式,并结合均方残差及其变化率等参数,形成受扰程度在线鉴别与估算方法,可以识别并选择未受扰或受扰程度低的数据,用于瞬态能量冲击干扰下的同步测量数据的修正,抑制干扰的影响,并能改善状态估计的粗差问题.依据这种估算方法还可建立一个"精度等级"体系,作为暂态分析与控制时使用数据的精度依据.

ANALYZING, ESTIMATING AND SUPPRESSING THE INFLUENCE OF TRANSIENT ENERGY IMPULSE ON SYNCHRONOUS MEASUREMENT

Transient energy impulses, which are caused by switching overvoltage, lightning surge and so on, belong to broad spectrum disturbances. They will be changed into decaying resonance by the filtering property of transmission circuits, and give harmful influence to synchronized measurements. This paper derives the estimation expression of pulse disturbed-degree. Combining this expression with the raean square error (MSE) and its rate of change, etc, an online judgment and estimation method is proposed, and can be used to identify and select those nil or low interfered measurement results in order to correct impulse-disturbed ones. It can suppress the influence of disturbance, and improve gross errors of the power system state estimation. Finally, a "precision level" grade system of measurement results is established based on this estimation method, working as the precision guide of data used for the transient analysis and control of the power system.