Active Voltage Feedback Control for Hybrid Multiterminal HVDC System Adopting Improved Synchronverters
Active Voltage Feedback Control for Hybrid Multiterminal HVDC System Adopting Improved Synchronverters
复制标题
DOI：
10.1109/tpwrd.2015.2420657
复制
发表时间：
2016-04
影响因子：
4.4
通讯作者：
Shuan Dong;Y. Chi;Yan Li
中科院分区：
文献类型：
--
作者：
Shuan Dong;Y. Chi;Yan Li
在本文中，我们提出了一个想法，将更多的可再生能源整合到现有的中国电网中，为偏远岛屿提供可靠的电力供应。其想法是将现有的点对点线路换向变换器（LCC）高压直流输电链路扩展为混合多终端高压直流（hybrid MTDC）系统，该系统包含LCC站和电压源变换器（VSC）站。因此，本文提出了一种新的控制策略——有源电压反馈控制，该控制策略在风速变化、负载波动、故障等各种干扰下不需要高速通信系统。本文还在同步器中加入了二次频率调节，这是将VSC变换器与同步电机特性相结合的一种方法。然后，本文提出了一种在故障条件下限制其电流的方法。最后，在PSCAD/EMTDC中对整个混合MTDC系统进行了建模。仿真结果表明，改进后的同步器能够实现二次频率控制，并且所提出的有源电压反馈控制在各种干扰下都能很好地工作。
In this paper, we propose an idea to integrate more renewable energy into the existing China power grid and to provide remote islands with a reliable power supply. The idea is to expand the existing point-to-point line-commutated converter (LCC) HVDC transmission link into a hybrid multiterminal HVDC (hybrid MTDC) system, which contains LCC stations and voltage-source converter (VSC) stations. Accordingly, this paper proposes a novel control strategy for this system called active voltage feedback control, which does not need any high-speed communication system under various disturbances, such as wind speed variations, load fluctuations, faults, etc. This paper also adds secondary frequency regulation to the synchronverter, which is one way of combining the VSC converter with synchronous machine behavior. Then, this paper applies an approach to limit its current under fault conditions. Finally, the entire hybrid MTDC system is modeled in PSCAD/EMTDC. Simulation results show that the improved synchronverter is able to achieve secondary frequency control, and the presented active voltage feedback control works very well when exposed to various disturbances.