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发明公开
CN104914354A 三相电压突变量和零序电压相结合的电压暂降检测方法 有权

三相电压突变量和零序电压相结合的电压暂降检测方法
摘要：
本发明涉及电能质量监测领域，公开了一种三相电压突变量和零序电压相结合的电压暂降检测方法：首先，采集线路在电压暂降期间三相电压瞬时值ua(k)、ub(k)、uc(k)，计算对应的三相电压突变量Δuφ(k)(φ＝A,B,C)和零序电压瞬时值u0(k)；其次，利用零序电压U0≥U0th＝k0.UN，k0取1％～2％，实现接地故障和非接地故障的区分；利用相电压突变量Δu′φ_max＝max[|Δuφ(k0+m)|]＝|Δuφ(k0+p)|≥uth1的特征确认故障相别；最后利用计算电压暂降深度，其中uφ1＝max|uφ(k0+m)|，uφ2＝min|uφ(k0+m)|，为实现电压暂降的按相快速精确补偿提供依据。
摘要（英）：

The invention relates to the electric energy quality monitoring field, and discloses a voltage sag detection method combining three-phase voltage break variables and zero-sequence voltage. The voltage sag detection method comprises the steps of: firstly, acquiring three-phase voltage instantaneous values ua (k), ub (k) and uc (k) of a circuit during the voltage sag period, and calculating corresponding three-phase voltage break variables delta u phi (k) (phi = A, B, C) and a zero-sequence voltage instantaneous value u0 (k); secondly, achieving the distinction of grounding faults and non-grounding faults by utilizing the conditions that the zero-sequence voltage U0 is greater than or equal to U0th which equals to k0*UN, wherein k0 is selected from 1% to 2%; thirdly, confirming fault phases by utilizing characteristics of a phase voltage break variable shown in the description; and finally calculating voltage sag depth by utilizing an equation shown in the description. The voltage sag detection method provides a basis for fast and accurate voltage sag compensation according to phases.

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