风电场动态无功补偿设备引发低频振荡实例分析及建议

Analysis on Low-frequency Oscillation Caused by Dynamic Reactive Power Compensation Equipment of Wind Farm and Its Recommendations

随着国家对新能源开发与利用的大力支持,各风电基地风电装机容量不断增加。但是风电基地均处于电网末端,末端电网与主网联系较弱,短路电流水平较低,抗扰动能力低。目前风电场升压站引入动态无功补偿设备,可以有效缓解电网电压波动,提高末端电网稳定性。但是动态无功补偿设备配置及参数设置不合理可能进一步恶化系统稳定性,甚至引发系统低频振荡问题。因此分析动态无功设备动态调节特性及各参数对系统稳定性影响,以新疆某地区风电场动态无功补偿设备电厂引发低频振荡为例,重现了风电场动态无功补偿设备参数设置不合理引发低频振荡现象。分析结果表明动态无功补偿设备参数对电力系统动态稳定具有重要影响,动态无功补偿设备电压控制方式及相关参数设置不合理可能诱发电力系统低频振荡。对风电场动态无功补偿设备提出了相关建议和措施,有效指导了相关参数设置,对风电场动态无功补偿设备运行与管理具有重要的指导意义。

As the development and utilization of new energy are supported by our country,the wind power bases and wind capacity keep growing. But wind power bases are in the end of power grid,the connection between the terminal grid and the main grid is weak,the level of short- circuit current and the ability to resist the disturbance are low. At present,the dynamic reactive compensation equipment is introduced into wind booster station,which can effectively alleviate the fluctuation of grid voltage and improve the stability of terminal grid. But the unreasonable configuration and parameters of dynamic reactive compensation equipment may deteriorate the system stability,and even cause low- frequency oscillation. So taking the low- frequency oscillation caused by the power plant with dynamic reactive power equipment of wind farm in one area of Xinjiang for example,the low- frequency oscillation caused by the unreasonable parameter setting of dynamic reactive power equipment of wind farm is reconstructed. The analysis results show that the parameter setting of dynamic reactive compensation equipment has vital influence on the dynamic stability of power system,and the unreasonable voltage control mode and related parameter setting may lead to low- frequency oscillation of power system. The relevant suggestions and measures are proposed for the dynamic reactive compensation equipment of wind farm,which gives an effective guidance for the relevant parameter setting,the operation and management of dynamics reactive compensation equipment.