基于双向直流变换器与储能系统的直驱式风机能量输出控制

Energy Output Control for PMSG Based on Bi-direction DC-DC Converter and ESS

本文提出一种包含储能单元的永磁直驱风力发电系统,通过对储能系统的控制实现对风机输出能量的控制,减小风机出力波动对于电网的影响。风机通过一个全功率背靠背变流器连接至电网,储能系统和双向DC-DC变换器通过背靠背的直流母线接入系统。背靠背变流器机侧使用最大功率追踪控制(MPPT),实现对风能的最大捕捉。储能单元通过检测风机的功率输出来进行充放电控制。基于Matlab/Simulink搭建了系统仿真模型,结果表明提出的系统的结构及控制策略可以有效地抑制风机的能量波动。

A PMSG wind power generation system including an energy storage system（ ESS） was proposed,with the energy output of PMSG controlled through the control of ESS to decrease the influence of wind power output fluctuation to the grid. The PMSG was connected to the grid through a full-power back-to-back converter. ESS and the bi-direction DC-DC converter was connected to the system through the DC bus of the back-to-back converter. A MPPT control strategy was deployed to the motor-side converter of the back-to-back converter to achieve a maximum capture of wind energy. ESS was controlled through the measurement of the energy output of PMSG. A simulation based on Matlab / Simulink was carried and the results show the effectiveness of the proposed system and control strategy can suppress the energy fluctuation of PMSG.