含传输线功率信号的双馈风电场附加阻尼控制策略

Ancillary Damping Control Strategy for Wind Farms with Doubly-fed Induction Generators Using Power Signals in Transmission Lines

从抑制电力系统区域间低频振荡以及减少风电机组传动链轴系扭振方面,提出双馈风电场附加阻尼控制策略。首先,建立了考虑传动链柔性的风电机组暂态模型及控制策略。其次,提出了考虑电力系统传输线功率信号的双馈风电机组无功功率环的附加阻尼控制策略。最后,以双馈风电场接入IEEE两区域四机系统为例,针对电网传输线三相短路故障和区域内同步发电机有功功率小扰动2种情况,分别对不同阻尼信号增益下的有功功率环和无功功率环附加阻尼控制策略的系统动态性能进行仿真。比较结果表明,与无附加阻尼控制相比,基于有功功率环或无功功率环的附加阻尼控制能够更好地抑制传输线功率振荡,且无功功率环附加阻尼控制不会导致风电机组传动链轴系扭矩振荡幅值增加。

From the viewpoint of damping the inter-area low frequency oscillation and decreasing the shaft torsion oscillation of the wind turbine drive train, an ancillary damping control strategy is proposed for wind farms with doubly-fed induction generators （DFIG）. Firstly, the transient state models of DFIG considering the drive train shaft tensional flexibility and control strategies are presented. Secondly, ancillary damping control strategies considering the power signals in transmission lines are developed on the reactive power control loop. Finally, an example of two-area four-machine power system of IEEE integrated with wind farms with DFIG is presented, with three-phase short-circuit fault on the transmission lines and the small disturbance of active power on the synchronous generator, dynamic performances of additional damping control are simulated by using different gains on the active power loop and reactive power loop respectively. The simulation results show that the power oscillation in the transmission lines is reduced by using the ancillary damping control strategy .on the active power loop and reactive power loop, and that the shaft torsion torque oscillation of the wind turbine drive train cannot be increased by the reactive power loop with this strategy. This work is supported by Program for New Century Excellent Talents in University （No. NCET-10-0878）, Key Technologies Research and Development Program of Chongqing （No. CSTC, 2011AB3069） and Scientific Research Foundation of State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology （No. 2007DA10512710101）