基于模态电流注入方法抑制次同步谐振的阻尼控制策略

Damping Controlling Scheme in SSR Mitigation Based on Modal Current Injection

文中提出了一种基于模态电流注入方法抑制次同步谐振的阻尼控制策略,包括最大转矩控制和最大阻尼控制两部分内容。该方法采用轴系扭振转速偏差作为输入信号,通过派克逆变换得到定子侧对应的次同步和超同步频率分量。在同步坐标下分析、对比了次同步频率和超同步频率注入电流的分流规律。在此基础上,提出了最大转矩控制方法,实现注入电流在转子侧形成的总转矩最大。提出了最大阻尼控制方法,满足最大转矩能够起到最大阻尼的作用。采用时域仿真方法对研究结论进行了验证。

In this paper, a novel damping controlling schemein subsynchronous resonance（SSR） mitigation by model currents injection was proposed, including the torque maximization scheme and the damping maximization scheme.Through Park inverse transformation, the sub-synchronous and sup-synchronous components in the statorcorresponding to shaft speed deviation were derived. In synchronous frame, the distribution characteristics of both the sub-synchronous and the sup-synchronous currents were analyzed. On this basis, the torque maximization controlling scheme was proposed, which maximize the electromagnetic torque generated by injected currents. Then, the damping maximization controlling scheme was proposed. Finally, the proposed controlling scheme is demonstrated by digital simulation.