中文摘要：

精度高、易实现、相对经济的电压暂态信号发生器对于工程应用中研究电压暂态检测算法有着重要作用。文中介绍了一种基于波形信号发生器加线性功率放大器的电压暂态发生器的设计方案。通过对传统的设计方法进行改造，设计了双DDS结构的波形发生器，并提出了在线分段幅值校准思想，可产生叠加谐波、相位跳变等特定情况的暂态测试信号。通过实验实测分析，所研制的样机产生的电压暂降测试信号，其幅值、持续时间和相位等性能指标可校准检定国家标准中A级电压暂降测量仪器。

英文摘要：

A voltage sag generator （VSG） with high-precision, easy to implement, and low-cost is important for the experiments of voltage sag detection. This paper presents a design scheme for the voltage sag generator by integrating the sinusoid-signal generator with linear power amplifier. The signal generator is designed and constructed by a dual DDS structure which can produce all kinds of transient test signals such as superimposed harmonics or phase-angle jumps. The ideas of amplitude calibration in real time and segment sampling are also introduced in order to achieve high precision measurements. The experimental results show that the amplitude, the duration time, the phase and oth- er performance index produced by prototype VSG system can be used to calibrate the Chinese National Standard Class A voltage sag measurement instruments.