Cui Puyi, Li Guoli, Zhang Qian, He Qinglian, Chen Zhong, Yang Wei
School of Electrical Engineering and Automation, Anhui University, Hefei, China.
Engineering Research Center of Power Quality, Ministry of Education, Hefei, China.
PLoS One. 2024 Jul 17;19(7):e0304979. doi: 10.1371/journal.pone.0304979. eCollection 2024.
DC circuit breakers (DCCBs) with high breaking capacity and low cost are necessary for quick fault clearance in DC networks. The assembly DC circuit breakers (ADCCBs) have a main breaking section (MBS) and a sub-breaking sections (SBS) for each line, which greatly reduce the cost. But in conventional operation, it bears high voltage for a long time when there is a main switch grounding process in any line fault action. To address this problem, a multiport assembly circuit breaker based on current injection (CI-MPACB) is proposed, which is able to generate a resonant current with increasing amplitude by controlling the duty cycle of Integrated Gate-Commutated Thyristors (IGCTs). Then the resonant current is injected into the SBS to generate current zero crossing and arc extinction. A complex frequency domain circuit analysis is performed on the MBS to describe the action logic as well as the commutation characteristics. In addition, the parameters of each component of the MBS are subject to multiple constraints and reasonable design to ensure the fault current could be cut off quickly and reliably. The cost of existing design is greatly reduced due to the design idea of resonant current injection device parameter selection. Finally, a PSCAD/EMTDC simulation confirms the opening viability of CI-MPACB and the accuracy of the parameter design. The test results show that the designed CI-MPACB can cut off DC fault lines.
具有高断路能力和低成本的直流断路器（DCCB）对于直流网络中的快速故障清除至关重要。装配式直流断路器（ADCCB）每条线路都有一个主断路部分（MBS）和若干个副断路部分（SBS），这大大降低了成本。但在传统运行中，当任何线路故障动作出现主开关接地过程时，它会长时间承受高电压。为解决这一问题，提出了一种基于电流注入的多端口装配式断路器（CI-MPACB），它能够通过控制集成门极换流晶闸管（IGCT）的占空比来产生幅值不断增大的谐振电流。然后将谐振电流注入到SBS中以产生电流过零并灭弧。对MBS进行了复频域电路分析，以描述其动作逻辑和换流特性。此外，MBS各部件的参数受到多种约束并进行合理设计，以确保故障电流能够快速可靠地切断。由于谐振电流注入装置参数选择的设计理念，现有设计的成本大幅降低。最后，PSCAD/EMTDC仿真证实了CI-MPACB的分闸可行性以及参数设计的准确性。测试结果表明，所设计的CI-MPACB能够切断直流故障线路。
