串并联型风电场机组的过电压协调控制

Coordination Control of Over-voltage for Turbines in Series-parallel Wind Farm

同一串联簇中机组运行于不同风速时,采用传统的最大功率追踪控制存在过电压、过调制问题。针对该问题,提出一种适用于串并联型风电场机组的过电压协调最大功率追踪控制策略。通过设定合理的直流母线上限值Umax,结合功率-电压协调控制调节处于高风速机组输出的功率,使任何状态下机组直流母线电压都被钳制在安全范围内。最后,在Matlab/Simulink搭建控制算法仿真模型,对传统过电压控制方法与本文所提策略的仿真结果进行对比分析,结果证明了所提出策略的可靠性和实用性。

When the wind turbines in the same series branch are operating at different wind speeds,the use of the traditional maximum power point tracking（MPPT）control strategy will lead to over-voltage and over-modulation. To solvethis problem,an over-voltage coordination control strategy with MPPT is proposed for the turbines in a series-parallelwind farm. By properly setting the upper limit of direct current（DC）voltage Umax,the output power from turbines at highwind speeds can be coordinated by combining the power-voltage coordination control,which ensures that the DC voltageof turbines can be restricted within a safety range in any operation state. A simulation model was established in the Matlab/Simulink platform,and the simulation result were compared between the traditional over-voltage control methodsand the proposed strategy in this paper,proving that the proposed strategy was reliable and effective.