永磁直驱式风力发电并网的仿真，控制部分包括:风力机建模+风机mppt最大功率跟踪控制+背靠背双pwm换流器+整流和逆变控制，都是双闭环pi矢量控制+滤波+调制环节。所有参数调节均已完成，可直接运行，模型可供初学者参考学习。

The output of the PMSG based wind energy conversion system (WECS) is fluctuating in nature due to intermittency of wind speed. The distribution static synchronous compensator (DSTATCOM) incorporated with the battery energy storage system (BESS) is used to smooth the power produced from wind generator system. The control strategy of BESS/DSTATCOM and its integration to mitigate the power fluctuations of grid connected WECS is presented. Three-leg three-phase voltage source converter (VSC) based DSTATCOM is used and the battery current is controlled to smooth the net power injected to the utility grid from wind power generation system. The control strategy implemented has the capability of supplying the required amount of power to the utility with help of batteries. The PQ control strategy is employed to control the three-phase inverter for managing power exchange with the utility grid. The real time wind speed data is considered for the simulation study of the system. The effectiveness of the control strategy of the system is validated through the simulation results in MATLAB/Simulink environment.

摘要——由于风速的间歇性， 基于 PMSG 的风能转换系统（WECS） 的输出具有波动性。 将配电网静态同步补偿器（DSTATCOM） 与蓄电池储能系统（BESS） 相结合， 用于平滑风力发电系统产生的功率。 本文提出了 BESS/DSTATCOM 及其集成控制策略，以减轻并网 WECS 的功率波动。 采用基于 DSTATCOM 的三桥臂三相电压源型变流器（VSC）， 通过控制蓄电池电流来平滑风力发电系统注入电网的净功率。 所实施的控制策略具有在蓄电池的帮助下向公用电网提供所需电能的能力。 采用 PQ 控制策略对三相逆变器进行控制， 实现对与电网进行功率交换的管理。 系统的仿真采用了实时的风速数据。 在 MATLAB/Simulink 环境下， 仿真结果验证了该系统控制策略的有效性。 可用作参考文献、毕设外文翻译。

ABSTRACT —— Unbalanced grid voltage sags are the severe challenge for wind power generation system which connected to the grid successfully. The dc bus voltage and output power will fluctuate under unbalanced grid voltage. Moreover, the voltage sags will lead to the increase of peak current, which will bring potential safety hazards to the operation of wind power system. This paper proposes a simple current limiting control scheme without auxiliary equipment, which based on the detailed analysis of the excessive peak current. In this scheme, the machine side converter (MSC) controller adjusts the electromagnetic power according to the power transmitted to the grid by the grid side converter (GSC). Meanwhile, it converts the unbalanced power on the dc-link into the rotor kinetic energy, avoiding the dc-link overvoltage. The GSC controller can not only ensure that the three-phase inverter currents are in the maximum safe range that the converters can bear, but also provide reactive power support for the grid. Furthermore, the fluctuations on dc bus voltage and output power can be eliminated effectively by using the GSC controller. The feasibility of the proposed scheme and the superiority over the traditional control schemes have been verified by simulations under different types of unbalanced voltage.

给出了永磁直驱式风力发电系统的拓扑结构,分析了直流卸荷电路的工作原理和拓扑结构,建立了永磁风力发电系统模型,运用Matlab/Simulink平台搭建了基于直流卸荷电路的永磁直驱风力发电系统低电压穿越技术仿真模型。仿真结果验证了系统的可行性和电网电压跌落时系统良好的穿越性能。该系统为进一步的产品实现打下了基础。