Grid connected voltage source converters are inevitable means now for expanding and supporting power systems. Nevertheless, their harmonic injection and high frequency switching may cause degradation of power quality and detraction of the equipment reliability. Therefore, the converters injected harmonics must observe the corresponding standards, while lower switching frequencies and rapid transient responses are desirable. In this paper, a new combined control method with a flexible switching table is presented for the converters to enhance the power quality and transient response. The method employs a virtual flux in connection with a combined control for the first time. In comparison with the conventional virtual flux direct power control, the proposed method provides better power quality, reduced THD and faster transient response, in addition to less grid parameters dependency. Compared to the conventional combined control method, it determines more accurately the converter voltage vectors, while avoiding grid voltage measurement and cumbersome controller tuning.

中文翻译：

---

基于快速动态和降低谐波的灵活切换表的并网变流器组合控制

并网电压源换流器是现在扩展和支持电力系统的必然手段。然而，它们的谐波注入和高频开关可能会导致电能质量下降和设备可靠性下降。因此，转换器注入谐波必须遵守相应的标准，而较低的开关频率和快速的瞬态响应是可取的。在本文中，提出了一种具有灵活切换表的新组合控制方法，用于转换器以提高电能质量和瞬态响应。该方法首次将虚拟通量与组合控制结合使用。与传统的虚拟磁通直接功率控制相比，所提出的方法提供了更好的电能质量、更低的 THD 和更快的瞬态响应，除了较少的网格参数依赖性。与传统的组合控制方法相比，它更准确地确定了换流器电压矢量，同时避免了电网电压测量和繁琐的控制器调整。