具有故障隔离能力的柔性多状态开关拓扑及控制技术研究

交流配电网普遍存在闭环设计、开环运行的现象,导致负荷转供速度慢,馈线功率不均衡。同时直流负荷的增加以及新能源渗透率的提高给配电网运行控制带来了新的挑战,要求配电网具备更强的潮流调节能力。为解决上述问题,研究了用于配电网馈线互联的柔性多状态开关(Soft Multi-State Open Point, SMOP)技术,提出基于双钳位子模块(Double Clamp Sub-Module, DCSM)的四端口模块化拓扑结构。基于其数学模型分析,确定了各端口的运行范围,设计控制系统结构并提出自愈控制策略。最后基于PSCAD搭建了四端口柔性多状态开关仿真模型,验证了所提拓扑及控制策略的有效性。

Research on topology and control technology of soft multi-state open point based with fault isolation capability

The common phenomenon of open-loop operation of closed-loop designed distribution networks leads to a slow load transfer speed and unbalanced feeder power. Meanwhile, the increasing amount of DC loads and the growth of new permeability have brought new challenges to the operation control of distribution network, which requires stronger power flow regulation ability. This paper carries out the study of Soft Multi-state Open Point (SMOP) technology used in distribution network feeder in order to meet the aforementioned challenges. A topology of a four-terminal SMOP based on Double Clamp Sub-Module (DCSM) is proposed followed by its mathematical model analysis. Based on the mathematical model, the operating range of the proposed topology is then determined. After that, the structure of control system and a self-healing control strategy is designed for the SMOP. A four-terminal SMOP simulation model based on PSCAD/EMTDC is constructed in which the validity of the proposed topology and its control strategy are verified. This work is supported by National Key Research and Development Program of China (No. 2017YFB0903100) and Science and Technology Project of State Grid Corporation of China (No. 521104170043).