【摘要】 详细地分析了无功发生源抑制电力系统次同步振荡(SSO)的机理,给出了系统附加电气阻尼的数学表达式和系统的影响因素。并建立了汽轮发电机组转子的集中多质量块弹性轴系的数学模型及轴系解耦运动方程式,以此为基础利用复转矩系数法解析地求解了与系统连接的快速控制无功发生源能有效地提高发电机组的次同步振荡的电气阻尼。最后,应用实时数字仿真器(RTDS)搭建了一个由固定串补引起的单机次同步振荡的电磁暂态仿真模型,仿真结果证实了无功发生源对汽轮发电机组次同步振荡具有显著的抑制效果。更多还原

【Abstract】 The mechanism of static var source depressing power system subsynchronous oscillations(SSO) is analyzed detailedly,and then the mathmatical expression of supplementary electrical damping along with its influencing factors are put forward.A multiple mass-lumped model of a generating unit and its decoupled equations of motion are established too.Furthermore,the effectiveness of static var source connected to the network to improve subsynchronous oscillation damping characteristics is testified analytically.Finally,the electromagnetic transient model of single machine power system including a fixed series compenstion capacitor is established by real-time digital simulator(RTDS).The simulation results show that it is effective for static var source to depress the subsynchronous oscillations of the generator.更多还原