摘要
柔性直流输电(柔直)技术采用了全控型电力电子器件,具有快速潮流控制、动态无功支撑、多端口协调运行、防止故障范围扩大等多方面优势,将其应用于电磁环网能够提高电网运行的安全性、可靠性、稳定性和经济性,具有良好的应用前景和推广价值,是解决电磁环网问题的新的、有效的手段。重点研究柔性直流应用于电磁环网基于广域信息的暂态稳定协调控制技术。首先对基于相平面(Δω-δ)轨迹凹凸性的暂态失稳判别原理及最小切机量计算进行了介绍,进而提出了柔直与稳控的协调控制技术方案,并讨论了协调控制总体框架及主站软件流程。电磁仿真验证结果表明:该技术方案可实现柔性直流应用于电磁环网的暂态稳定协调控制,可最大程度利用柔直容量对暂态过程中的系统进行有功及无功支撑,优化稳控措施量,保证柔直系统能够发挥有功的传输、电压的紧急支撑,避免控制原因导致的换流器过载致使柔性装置失效,保持电网稳定运行。
VSC-HVDC （VSC） technology uses full controlled power electronic devices,with fast flow control, dynamic reactive power support, multi port coordination operation, to prevent the failure to expand the scope and many other advantages, its application in the electromagnetic loop network can improve the operation of the safety, reliability, stability and economy, has good application prospect and popularization value, is a new and effective means to solve the problem of electromagnetic loop network. This paper focuses on the study of the transient stability and coordination control technology of VSC system based on wide area information. Firstly, based on the phase plane transient concavity trajectory instability and the minimum amount of the principle of distinguishing cutting machine are introduced, and then put forward the VSC and stability control of coordinated control scheme, and discussed the coordination control framework and the main software flow. The simulation results show that the technology of transient stability coordination control scheme can realize VSC applied to the electromagnetic loop network, to maximize the use of direct soft capacity of the system in the transient process of active power and reactive power support, optimizing the stability control measures, to ensure the emergency support system can play VSC transmission, the active voltage and to avoid converter overload resuiting in VSC device failure control, maintain stable operation of power grid.
出处
《东北电力大学学报》
2017年第3期19-25,共7页
Journal of Northeast Electric Power University
