次同步振荡动态稳定器抑制弱阻尼次同步振荡的机理与实验

摘要

In view of the subsynchronous oscillation with weak damping occurring in Hulunbeier power plant in the Hulunbeier League power system,the subsynchronous oscillation-dynamic stabilizer(SSO-DS)is recommended to suppress the oscillation in this actual project.This paper proposes the subsynchronous modulation of instantaneous reactive power control strategy for SSO-DS.The damping provided by SSO-DS using the proposed control strategy is derived on the basis of the complex torque coefficient method.Relevant factors that influence the size of the damping are presented.And the real-time digital and physical closed-loop simulation platform is developed.In order to suppress the subsynchronous oscillation with weak damping,a method of finding the effective damping area is proposed to optimize the controller parameters.The effectiveness of the control strategy and the accuracy of parameter optimization are both verified by closed-loop simulation and field experiment.%针对呼盟系统呼伦贝尔电厂存在的弱阻尼次同步振荡问题，实际工程采用次同步振荡动态稳定器(SSO-DS)进行抑制。文中提出了一种适用于 SSO-DS 的瞬时无功功率次同步调制策略，基于复转矩系数法推导出该控制策略下 SSO-DS 提供的阻尼，给出了影响其阻尼大小的相关因素；搭建了实时数字—物理闭环仿真平台，并基于弱阻尼次同步振荡问题，提出了确定其有效阻尼区域的方法，对控制器参数进行优化。闭环仿真及现场实验均验证了 SSO-DS 控制策略的有效性以及闭环仿真实验参数优化的准确性。