共水力单元发电机组动态特性工程化仿真

Simulation and dynamics analysis for common hydraulic unit generator set

针对共水力单元发电机组水力耦合数学模型缺乏岔点描述等问题,引入共管岔点压力的微分表达式,与水力系统以及调速器模型共同构成新的水力发电机群数学模型,在机群共轭以及反轭调节的工况条件下分别进行仿真试验,基于岔点压力的动态变化探讨共水力单元机群的水力干扰特性及其复杂的调节搭配问题,以便于共水力单元机群参与机网协调控制时灵活采用群内协调方式,满足AGC与一次调频等快速调节要求.仿真试验证实了反轭调节的有利影响,基于通用DCS的组态实现方法为其工程在线应用提供了现实条件.

In response to the lack of bifurcation description in the hydraulic coupling mathematical model of a common hydraulic unit generator set,a differential expression for the pressure at the bifurcation point of the common pipe was introduced,which was combined with the hydraulic system and governor model to form a new mathematical model for the hydraulic generator group.Simulation was conducted under the conditions of conjugate and anti yoke regulation of the group,based on the dynamic changes of bifurcation pressure,the hydraulic interference characteristics and complex adjustment matching problems of the common hydraulic unit cluster were explored to flexibly adopt the intra group coordination method when participating in the coordinated control of the machine network of the common hydraulic unit cluster,and meet the fast adjustment requirements of AGC and primary frequency regulation.Simulation experiments have confirmed the beneficial effects of anti yoke regulation,and the configuration implementation method based on general DCS provides practical conditions for its engineering online application.