“汽电双驱”引风机驱动方案的电气原理与应用

The Electrical Principle And Application of Steam&Motor-Driven Feed Induced Draught Fan

介绍某火力发电厂中“汽电双驱”的引风机驱动方案的配置、结构以及各运行工况。阐述该系统的电气原理、介绍异步电机的参数选取和边界条件;并分析系统工作的稳定性,以及在各种不同工况下,电机、汽轮机和引风机如何配合以实现功率的自平衡。计算该异步电机对降低厂用电率的作用,及其对中压母线电压降和短路电流的影响。

Introduces the configuration,mechanical structure and operating conditions of the induced draft fan drive scheme of"steam&motor-driven feed"which has been realized in one Coal-fired power plant.The electrical principle of the system is described,and the parameter selection and boundary conditions of asynchronous motor are introduced;It also analyzes the stability of the system and how the motor,steam turbine and induced draft fan cooperate to realize power self-balance under various working conditions.The effect of the asynchronous motor on reducing the auxiliary power consumption rate and its influence on the voltage drop and short-circuit current of the medium voltage bus are calculated.This paper can provide some reference for the application of"steam&motor-driven feed"induced draft fan drive scheme in power plants in the future.