提高下垂控制逆变器虚拟功角暂态稳定性的控制方法

发布时间：2018-07-11 13:05

本文选题：逆变器 + 虚拟功角　；参考：《电力系统自动化》2017年12期

【摘要】：下垂控制逆变器在大扰动下存在类似于传统同步发电机的暂态失稳现象,且受到逆变器输出电流限幅环节的影响使其电压控制环失去作用,因而工作于饱和电流源模式。文中进一步分析了在暂态过程中由于电压非理想跟踪特性而导致虚拟功角曲线发生偏移、并使逆变器暂态稳定裕度下降的机理。在此基础上,提出一种估计逆变器输出电流并用于前馈控制的方法,以提高逆变器的电压跟踪性能,从而提高逆变器的暂态稳定性。此外,针对逆变器暂态过程中无稳定平衡点的问题,提出一种暂态同步控制策略。当逆变器电压控制环饱和失控时,将逆变器控制在合适的平衡点,以防止其发生暂态失稳,同时为系统提供无功支持。最后,采用单机无穷大系统验证了所提出方法的有效性。
[Abstract]:The droop control inverter has transient instability phenomenon similar to that of the traditional synchronous generator under large disturbance, and its voltage control loop loses its function due to the influence of the output current limiting link of the inverter, so it works in the saturated current source mode. In this paper, the mechanism that the virtual power angle curve is offset and the transient stability margin of the inverter is reduced due to the non-ideal tracking characteristics of the voltage during the transient process is further analyzed. On this basis, a method of estimating the output current of the inverter and applying it to feedforward control is proposed to improve the voltage tracking performance of the inverter and improve the transient stability of the inverter. In addition, a transient synchronization control strategy is proposed to solve the problem that there is no stable balance point in the transient process of the inverter. When the voltage control loop of the inverter is saturated and out of control, the inverter is controlled at a suitable balance point to prevent transient instability and provide reactive power support for the system. Finally, the effectiveness of the proposed method is verified by using a single machine infinite bus system.
【作者单位】：浙江大学电气工程学院;云南电网有限责任公司调度控制中心;华中科技大学电气与电子工程学院;
【基金】：国家重点研发计划资助项目(2016YFB0900104) 国家自然科学基金资助项目(51577168) 云南电网科技项目(yndw(2016)000303DD00124)~~
【分类号】：TM464

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