利用Matlab Simulink平台进行虚拟同步发电机（VSG）控制的仿真方法，旨在解决电网电压不平衡条件下的电流平衡、有功恒定和无功恒定控制问题。文中首先解释了三种不同控制模式的选择方式及其核心算法，强调了电流平衡模式下的负序电流补偿器的设计以及关键参数的设置。接着讨论了如何通过调节电压不平衡度来模拟不同的电网状况，并提供了具体的MATLAB代码示例用于调整跌落系数矩阵。此外，针对有功恒定模式，提出了加入低通滤波以减少功率振荡的方法。最后提到了一些高级特性，如批处理仿真和波形录制功能，帮助用户更好地理解和优化仿真结果。 适用人群：对电力系统稳定性分析感兴趣的科研工作者和技术人员，特别是那些希望深入了解VSG控制机制及其应用的人群。 使用场景及目标：适用于需要评估或测试VSG控制系统性能的研究项目；也可作为教学材料辅助学生掌握相关理论知识和技术技能。 其他说明：文中提供的参考资料进一步补充和完善了所介绍的技术细节，为实际操作提供了指导。

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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.