Transient stability of a distribution subsystem during fault-initiated switching to islanded operation
Transient stability of a distribution subsystem during fault-initiated switching to islanded operation
复制标题
故障启动切换到孤岛运行期间配电子系统的暂态稳定性
DOI：
10.1016/j.ijepes.2017.11.024
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
Haijie Qi
中科院分区：
文献类型：
--
作者：
Wei Zheng;P. Crossley;Bingyin Xu;Haijie Qi
本文研究了负载丰富的配电子系统在由永久性故障引起的孤岛模式切换过程中的暂态稳定性。当在孤岛模式下运行时，子系统必须保持发电-负载功率平衡，并使用至少一台分布式发电机（DG）来调节系统频率和电压。因此，必须在主电网断开后执行切换控制，并提出了包括DG协调方法和单步甩负荷方案的策略。其他因素也对系统暂态性能产生重大影响，包括子系统负载类型、DG 穿透水平、故障清除时间和切换控制延迟。为了进行这项研究，使用 PSCAD/EMTDC 软件对配电子系统进行了仿真，该子系统由同步和基于逆变器的 DG 的组合以及静态负载和动态电机负载的组合组成。仿真结果表明，所提出的切换控制策略能够有效保证不同故障条件和DG渗透水平下并网到孤岛模式的成功切换。
This paper investigates the transient stability of a load-rich distribution subsystem during the switching process to islanded mode instigated by a permanent fault. When operating in islanded mode, the subsystem must maintain a generation-load power balance and use at least one distributed generator (DG) to regulate the system frequency and voltage. Therefore, switching control must be executed after the disconnection of the main grid and a strategy which includes a DG coordination method and a single-step load shedding scheme is proposed. Other factors also have a substantial impact on the system transient performance, including the type of subsystem load, the DG penetration level, the fault clearance time and the switching control delay. To perform the study, a distribution subsystem was simulated using PSCAD/EMTDC software, consisting of a mix of synchronous and inverter-based DGs and a combination of static loads and dynamic motor loads. Simulation results show the proposed switching control strategy can effectively ensure successful switching from grid-connected to islanded mode under different fault conditions and DG penetration levels.