直驱风电机组的风电场建模及联络线故障研究

Modeling and Liaison Line Fault of Wind Power Plant with Direct Drive Wind Power Units

直驱风电机组由于其优越性成为主流机型广泛应用于风电场。文章研究了直驱风电机组的数学模型和控制策略,在此基础上,搭建了基于直驱风电机组的风电场模型。仿真了其稳态特性,验证了搭建模型的正确性。并仿真了风电场联络线故障时风电场侧和系统侧电流、电压、电流三序分量、电压三序分量,分析了上述研究对象的变化趋势及原因,指出直驱风电场联络线发生任何类型的不对称接地故障,风电场侧都会表现出弱电源特性,单相接地故障表现出的弱电源特性更为突出,而系统侧不存在弱电源特性现象,研究指出直驱风电场弱电源特性会对故障选相元件产生加大影响,严重时会造成选相失败。研究成果具有一定的实际价值和意义。

the direct driven wind turbine due to its superiority has become the mainstream models are widely used in wind farms. This paper studies the mathematical model and the control strategy of direct driven wind turbine, on this basis, to build a wind farm model based on direct drive wind turbines. The steady state characteristics of the simulation, to verify the correctness of the model was set up. And the simulation of wind farms wind farm fault of line side and the system side current, voltage, current, voltage of three sequence fault component, three sequence components, analysis of the trend of the study, pointed out that the asymmetric direct drive wind farm tie line of any type of grounding fault, the wind farm side will show a weak source feature the single-phase grounding fault, showed a weak source feature is more prominent, and the system characteristics of the power supply side has weak phenomenon, research indicates that direct drive wind ifeld characteristics of weak power will have increased impact on the fault phase selection components, serious when can cause the phase failure. Research ifndings has a certain practical value and signiifcance of the research.