为解决工业现场通信网络普遍存在的协议碎片化、拓扑灵活性不足及实时性与带宽难以兼顾等问题,设计了一种基于可编程逻辑控制器(Programmable Logic Controller,PLC)与分布式控制系统(Distributed Control System,DCS)的工业现场通信网...为解决工业现场通信网络普遍存在的协议碎片化、拓扑灵活性不足及实时性与带宽难以兼顾等问题,设计了一种基于可编程逻辑控制器(Programmable Logic Controller,PLC)与分布式控制系统(Distributed Control System,DCS)的工业现场通信网络系统。该系统通过整合多协议网关与冗余控制架构,实现了异构协议的协同工作,并采用混合拓扑结构与优先级队列机制,有效提升了数据传输的可靠性与网络扩展能力。测试结果表明,该系统能够降低协议转换错误率和传输延迟,提高带宽利用率,为复杂工业环境下的设备互联与数据交互提供了技术支撑。展开更多
To enhance power flow regulation in scenarios involving large-scale renewable energy transmission via high-voltage direct current(HVDC)links and multi-infeed DC systems in load-center regions,this paper proposes a hyb...To enhance power flow regulation in scenarios involving large-scale renewable energy transmission via high-voltage direct current(HVDC)links and multi-infeed DC systems in load-center regions,this paper proposes a hybrid modular multilevel converter–capacitor-commutated line-commutated converter(MMC-CLCC)HVDC transmission system and its corresponding control strategy.First,the system topology is constructed,and a submodule configuration method for the MMC—combining full-bridge submodules(FBSMs)and half-bridge submodules(HBSMs)—is proposed to enable direct power flow reversal.Second,a hierarchical control strategy is introduced,includingMMCvoltage control,CLCC current control,and a coordinationmechanism,along with the derivation of the hybrid system’s power flow reversal characteristics.Third,leveraging the CLCC’s fast current regulation and theMMC’s negative voltage control capability,a coordinated power flow reversal control strategy is developed.Finally,an 800 kV MMC-CLCC hybrid HVDC system is modeled in PSCAD/EMTDC to validate the power flow reversal performance under a high proportion of full-bridge submodule configuration.Results demonstrate that the proposed control strategy enables rapid(1-s transition)and smooth switching of bidirectional power flow without modifying the structure of primary equipment:the transient fluctuation ofDC voltage from the rated value(UdcN)to themaximumreverse voltage(-kUdcN)is less than 5%;the DC current strictly follows the preset characteristic curve with a deviation of≤3%;the active power reverses continuously,and the system maintains stable operation throughout the reversal process.展开更多
文摘为解决工业现场通信网络普遍存在的协议碎片化、拓扑灵活性不足及实时性与带宽难以兼顾等问题,设计了一种基于可编程逻辑控制器(Programmable Logic Controller,PLC)与分布式控制系统(Distributed Control System,DCS)的工业现场通信网络系统。该系统通过整合多协议网关与冗余控制架构,实现了异构协议的协同工作,并采用混合拓扑结构与优先级队列机制,有效提升了数据传输的可靠性与网络扩展能力。测试结果表明,该系统能够降低协议转换错误率和传输延迟,提高带宽利用率,为复杂工业环境下的设备互联与数据交互提供了技术支撑。
基金supported by Science and Technology Project of the headquarters of the State Grid Corporation of China(No.5500-202324492A-3-2-ZN).
文摘To enhance power flow regulation in scenarios involving large-scale renewable energy transmission via high-voltage direct current(HVDC)links and multi-infeed DC systems in load-center regions,this paper proposes a hybrid modular multilevel converter–capacitor-commutated line-commutated converter(MMC-CLCC)HVDC transmission system and its corresponding control strategy.First,the system topology is constructed,and a submodule configuration method for the MMC—combining full-bridge submodules(FBSMs)and half-bridge submodules(HBSMs)—is proposed to enable direct power flow reversal.Second,a hierarchical control strategy is introduced,includingMMCvoltage control,CLCC current control,and a coordinationmechanism,along with the derivation of the hybrid system’s power flow reversal characteristics.Third,leveraging the CLCC’s fast current regulation and theMMC’s negative voltage control capability,a coordinated power flow reversal control strategy is developed.Finally,an 800 kV MMC-CLCC hybrid HVDC system is modeled in PSCAD/EMTDC to validate the power flow reversal performance under a high proportion of full-bridge submodule configuration.Results demonstrate that the proposed control strategy enables rapid(1-s transition)and smooth switching of bidirectional power flow without modifying the structure of primary equipment:the transient fluctuation ofDC voltage from the rated value(UdcN)to themaximumreverse voltage(-kUdcN)is less than 5%;the DC current strictly follows the preset characteristic curve with a deviation of≤3%;the active power reverses continuously,and the system maintains stable operation throughout the reversal process.
