基于磁放大器的新型可调电抗器的应用

Application of magnetic amplifier-based adjustable reactor

针对可控串联补偿问题,由于电力电子装置造价高昂,结构复杂,研究基于直流磁控可调电抗器的新型磁放大器.与现有的直流磁控可调电抗器相比,结构简单,响应速度快,电抗值线性可调.分析该磁放大器的运行原理,建立磁放大器控制模型,探讨该装置在抑制电力系统低频振荡中的应用.通过对发电机和磁控放大器的动态建模,计算获得控制器参数,应用电磁暂态仿真软件(PSCAD)验证了新型磁放大器抑制和缓解低频振荡的有效性.

The power electronic devices have disadvantages including high cost and complex control facility. In order to solve the problem, magnetic amplifier was presented as a new approach to improve the system stability based on magnetically saturating reactor concept. The new device has more simple structure, smaller response time and linear output reactance. The operation principles of the magnetic amplifier were analyzed, and the model was built. A control strategy was proposed to demonstrate the application of the new device for damping low-frequency oscillation in single-machine infinite-bus system. A comparative analysis of the controller＇s performance was conducted. The experiments were developed by power systems CAD （PSCAD）. Results verified the effectiveness of controller in damping low-frequency oscillations.