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针对补偿电压注入约束下的不对称电压暂降补偿,提出一种新的动态电压恢复器补偿策略。首先以A相为参考相,以各相电压端点为圆心作补偿极限圆,通过旋转B、C相极限圆得到有效补偿域;然后根据有效补偿域与参考电压圆的交角来确定完全补偿弧;最后沿此弧旋转负荷电压,在弧内求取最小能量注入解。该方法简单直观,适用于补偿三相负荷完全对称时由各种故障类型引起的电压暂降。由于此方法无需先抵偿负序和零序分量,通过在有效补偿域内对源电压进行直接计算,最大故障范围内实现负荷电压的对称补偿,且求解过程无循环搜索,响应速度快,满足实际工程应用的需求。
Aiming at the asymmetrical voltage sag compensation under the constraint of compensation voltage injection, a new compensation strategy of dynamic voltage restorer is proposed. First of all, take phase A as reference phase, taking the voltage end of each phase as the center of the circle as the compensation limit, and obtain the effective compensation domain by rotating the limit circles of phase B and phase C. Then determine the complete compensation arc according to the intersection of the effective compensation domain and the reference voltage circle; Finally, along the arc load voltage rotation, in the arc to find the minimum energy injection solution. The method is simple and intuitive and suitable for compensating voltage sags caused by various fault types when the three-phase load is completely symmetrical. Because this method does not need to offset the negative sequence and zero sequence components first, through the direct calculation of the source voltage in the effective compensation domain, the symmetrical compensation of the load voltage can be realized within the maximum fault range, and the search process has no cycle search and the response speed is fast. Application requirements.