弱电网下风力发电机组并网变流器直流电压稳定性机理分析

发布时间：2018-04-21 07:00

本文选题：并网变流器 + 直流电压控制　；参考：《高电压技术》2017年09期

【摘要】：为研究连接弱交流电网的风力发电机组并网变流器直流电压控制的稳定性,从直流电压控制二阶简化模型入手说明通过分析阻尼和恢复分量可以判断直流电压稳定性。通过并网变流器控制系统相量图直观地描述了直流电压控制的动态,从物理意义上说明强电网和弱电网下锁相控制对直流电压控制稳定性的影响,发现锁相控制对直流电压控制的滞后作用会引起负阻尼而减弱直流电压的稳定性。然后,分析了不同条件下,锁相控制对直流电压控制的阻尼分量和恢复分量的影响,发现锁相控制在其带宽接近直流电压控制带宽时对直流电压控制稳定性的影响最大。最后,在Matlab/Simulink中搭建时域模型进行仿真分析与验证。
[Abstract]:In order to study the stability of DC voltage control of wind turbine grid-connected converters connected with weak AC power grid, the second order simplified model of DC voltage control shows that the stability of DC voltage can be judged by analyzing damping and restoring components. Through the phasor diagram of grid-connected converter control system, the dynamic of DC voltage control is described intuitively, and the effect of phase lock control on DC voltage control stability is explained in the physical sense. It is found that the hysteresis effect of phase-locked control on DC voltage will lead to negative damping and weaken the stability of DC voltage. Then, the influence of phase-locked control on the damping and recovery components of DC voltage control is analyzed under different conditions. It is found that the stability of DC voltage control is most affected by phase-locked control when its bandwidth is close to DC voltage control bandwidth. Finally, a time domain model is built in Matlab/Simulink for simulation analysis and verification.
【作者单位】：武汉理工大学自动化学院;全球能源互联网研究院先进输电技术国家重点实验室;
【基金】：国家自然科学基金(51607130) 2017年先进输电技术国家重点实验室开放基金(编号略)~~
【分类号】：TM315;TM46

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