柔性励磁系统无功阻尼控制器参数整定方法及现场应用

Parameter Setting Method and Field Application of Reactive Power Damping Controller for Flexible Excitation System

该文提出基于模型实测校核的柔性励磁系统无功阻尼控制器参数整定方法。通过线性化方法构建包含柔性励磁系统的Philips-Heffron模型,得到发电机电力系统稳定器(PSS)控制通道和无功阻尼控制通道的复转矩数学模型,开展影响控制器参数整定因素的量化分析。通过实测PSS控制通道的无补偿相频特性对复转矩模型进行校核,在校核模型的基础上,依据阻尼转矩相位校正要求对无功阻尼控制器的超前滞后等控制参数进行整定。现场应用结果表明,整定后的无功阻尼控制器显著提升了发电机对有功振荡的阻尼抑制效果,验证了柔性励磁系统无功阻尼控制技术的有效性,为进一步发挥柔性励磁系统双通道控制优势应对新型电力系统宽频振荡问题奠定良好的基础。

Based on the verified complex torque model,the parameter setting method of reactive power damping controller(RPDC)for flexible excitation system is proposed in this paper.The Philips-Heffron model with flexible excitation system is built by the linearized modeling method,and the small perturbation complex torque models of both PSS control channel and RPDC control channel are deduced.Then,the quantitative analysis of different influencing factors are carried out.The complex torque model is verified by the measured uncompensated phase-frequency characteristic of PSS control channel.Based on the verified complex torque model,the lead-lag parameters of RPDC are adjusted to achieve the maximum damping torque.The field test results show that,using the proposed parameter setting method,the local machine frequency power oscillation can be effectively suppressed by the RPDC,which is also the first time to successfully apply RPDC in practice and lays a good foundation to take the advantage of double damping channels of flexible excitation system for suppressing the wider frequency power oscillation in new power system.