火电厂辅机变频器低电压穿越技术综述

Review of LVRT technology for auxiliary equipment inverter of thermal power plant

随着变频技术在火电厂辅机驱动中的广泛应用,为了确保电压跌落情况下火电机组自身及电网的安全稳定运行,提高辅机变频器的低电压穿越(LVRT)能力显得尤为重要。首先,分析了电源电压跌落对火电厂辅机变频器的影响,并介绍了目前最新的火电厂辅机变频器LVRT技术规范;然后,系统性地总结和评价了国内外现有的各种LVRT技术;最后,参照风电机组LVRT技术的发展历程,对火电厂辅机变频器LVRT技术未来的发展方向进行了展望。

As the converter technique is widely used to the motor driving of auxiliary equipments in thermal power plants,the LVRT（Low-Voltage Ride-Through） ability of auxiliary equipment inverter should be particularly improved for the safe and stable operation of both thermal power plant and power grid during the voltage dip. The impact of generator voltage dip on the auxiliary equipment inverter of thermal power plant is analyzed and the latest technical specifications of LVRT for the auxiliary equipment inverter of thermal power plant are introduced. The existing domestic and foreign LVRT technologies are summarized and evaluated systematically. With the reference to the development of LVRT technology for wind turbine generator,the future development direction of LVRT technology for the auxiliary equipment inverter of thermal power plant is prospected.