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来源：百度知道 编辑：UC知道 时间：2024/05/06 11:15:20
During recent years electric power systems are growing more and more complex. The use of distributed generation, the connection of non-linear loads and the presence of unexpected system faults generate lot of harmonics and noise. Therefore, the registration of electrical energy is becoming much more problematic day by day and a precise and reliable assessment method is required to overcome these problems. Conventional Ferraris (electro- mechanical) watt-hour meters [1] have been in use in most parts of the world for over half a century but their accuracy has been adversely affected at the presence of harmonics [2]. A variety of techniques and algorithms have been proposed in different literature for on-line estimation of power system energy under non-sinusoidal condition. Among them analog multiplier based analog electronic energy meters [3,4] are the simplest choice but they have the disadvantage of too many discrete components (against the recent trend of design with integrated circu

在近年电力系统变得越来越复杂。 使用分配的产生，连接非线性负荷和想不到的系统错误的存在产生一批和声学和噪音。 因此，电能的登记正逐日变得更加成问题，一种准确和可靠的评价方法被要求解决这些问题。 传统的法拉利(机械电)瓦时米 [1]在大多数世界的部分内适合越过半个世纪使用中是但是他们的准确已经被相反在和声学的存在影响 [2]. 多种技术和算法已经被在在非sinusoidal的状态下的动力系统能量的在线估计的不同的文学方面提议。 在他们模拟乘数基于模拟电子能源米中
[3,4 ]简单选择是他们有太多的缺点分离零部件(反对设计与集成电路(IC)一起的近期趋势 [5]),对可靠性和校准有不利影响。 取样基于的数字的瓦时米已经被介绍在里 [6-8]但是当取样不是锁住到被取样的频率的一些倍数的阶段时，他们提供重要的错误。 广泛使用的能量评价技术基于离散傅里叶变换(DFT)算法 [9-11],全部电压和电信号的谐波分量已经被分析达到被要求的测量准确。 商品能源测量设备也跟随相同的衣服 [12]. 但是在实行DFT过程中，别名使用，渗漏和纠察员栅栏影响的现象可能导致被分析并且调查在里的不精密的估计 [13]. 而且，它有限度检测短期的时变信号。 最近，提议接近基于分离子波分析(DWT) [14]哪个提供好时机地方化，但是频率决定不作为是敏锐的，特别在更高的频率。