一种火电机组用电力电子式电压扰动发生器研究

为了准确分析火电机组变频调速系统的高低电压穿越能力，针对市场对电压穿越能力试验设备的需求，提出一种新型电力电子式的电压扰动发生器的设计。采用不可控整流和BOOST升压电路，将不可控整流电路输出的直流电升压到预定电压后输出，再经过逆变器控制输出任意模拟电压故障波形。所提设计可模拟单相、两相及三相电压的暂升和暂降，其持续时间、深度、起止相位和类型均可做到持续调节。实验结果证明：这种新型电压扰动发生器设计安全可靠，能够准确反应电网故障电压类型，可广泛用于火电机组变频调速系统高低电压穿越能力试验研究。

A kind of power electronic voltage disturbance generator used in thermal power units

In order to accurately analyze the high- and low-voltage ride through capacity of variable frequency speed regulation system in thermal power unit, this paper proposes a new design of power electronic voltage disturbance generator, according to the market demand on the voltage ride through capacity testing equipment. It adopts uncontrollable rectifier and booster circuit, which boosts the direct current voltage generated by uncontrollable rectifier circuit to the scheduled voltage, and then controls output analog voltage fault waveform through the inverter. It can simulate single-, bi-, and tri-phase voltage swell and sag, and its duration, depth, start-stop phase and type can all be adjusted smoothly. The experimental results prove that the new designed voltage disturbance generator is safe and reliable, which can correctly reflect the grid fault voltage type, and can be widely used in studying the high- and low-voltage ride through ability of frequency speed regulation system in thermal power unit.