基于矢量解耦控制的风电并网逆变器研究

Research on Wind Power Grid-connected Inverter with Vector Decoupling Control

三相PWM逆变器是风力发电并网系统的主要部分,开发高性能的逆变器控制策略已成为研究的重点。在对风力发电并网逆变器系统数学模型分析的基础上,对逆变器在三相同步旋转坐标系下的数学模型进行了推导与分析,提出了一种矢量解耦控制策略,对直流侧电容电压的平衡进行了分析与补偿设计,给出了矢量解耦控制算法的软件流程。实验结果表明,该控制策略能获得较好的控制性能,并能实现单位功率因数校正。该逆变器运行效率高,可靠性好。

Developing a high performance control strategy is a significant point in three-phase PWM inverter,which is an important part of wind power generation.On the basis of analyzing the modeling of grid-connected inverter for wind power generation system,the mathematical model of grid-connected inverter at the three-phase synchronous rotating coordinate system was analyzed and deduced.A novel vector decoupling control strategy was proposed.On the basis of analyzing the balance of the DC side capacitor voltage,the corresponding voltage deviation compensation was designed.The software process of vector decoupling control algorithm was given.Experimental results of steady test and dynamic state test prove that the proposed control strategy has the satisfactory control performance,and it can achieve unity power factor correction.The efficiency of proposed inverter is high,the reliability is well.