220kV新型固态限流器实用化样机优化设计

发布时间：2018-04-08 18:28

本文选题：新型固态限流器　切入点：工作原理　出处：《浙江大学》2017年硕士论文

【摘要】：电力系统发生的各种故障中,最容易发生并且对系统运行与电力设备破坏最大的是短路故障。为了抑制短路电流对电力设备造成的损害,增强电力系统可靠性与稳定性,研制有效的短路限流技术与限流装置已成为当下研究热点。本文在前人研究的基础上,设计应用于220kV/1.5kA系统的新型固态限流器实用化样机。论文针对系统限流要求与工程实际应用,对新型固态限流器主电路电气装置与控制保护系统进行优化设计。首先,论文简要分析了目前国内外不同类型短路限流器的限流原理,对比各种限流器在实际工程应用中的优缺点,最终确定以饱和型自耦变压器耦合桥式固态限流器作为新型固态限流器实用化样机方案。论文详细分析了饱和型自耦变压器耦合桥式固态限流器工作原理,通过建立不同状态下的限流器数学模型为样机主设备的参数设计打下基础。此外,论文介绍了新型固态限流技术与柔性交流输电技术的结合,并且以限流式统一潮流控制器(Unified Power Flow Controller,UPFC)为例,针对装置中的限流器模块分析其对电力系统暂态稳定性的影响,并在标准的220kV三机九节点系统中进行仿真。仿真结果表明在故障发生后,限流式UPFC不仅可以改善电力系统发电机输入输出功率的不平衡,使其功角振荡的幅度和持续时间大大减小,而且可以避免系统母线电压大幅下跌,提高了电力系统的暂态稳定性。其次,论文针对220kV新型固态限流器工业样机进行主设备优化设计,包括饱和型自耦变压器设计、晶闸管选型、限压阀选型、直流限流电抗设计、冷却循环系统选型、电流电压互感器以及旁路隔离开关和断路器的选型。在ANSOFT/SIMPLORER仿真软件中建立饱和型自耦变压器耦合桥式固态限流器主电路模型,进行了正常工况与短路工况的联合仿真,分析对比了有无装设限流器情况下线路短路电流的水平,表明主设备设计满足限流要求。此外,设计完成了限流器装置整体布置方案。最后,论文针对新型固态限流器工业样机控制保护系统进行设计,包括硬件设计与软件实现。新型固态限流器工业样机控制保护系统硬件选用美国国家仪器公司的高性能实时控制系统硬件平台,主要由人机交互系统、核心控制器、输入/输出模块、信号调理模块、光电转换模块等部分组成。控制保护系统的软件主要由六大状态处理模块组成,各模块分工明确且相互独立。研制出新型固态限流器低压物理模型样机,进行了短路限流实验。通过对其运行工况的分析,进一步验证和完善了控制保护系统的设计。此外,从新型桥式固态限流器控制模式出发,对故障后切除限流电抗短路电流的续流瞬断模式、逆变瞬断模式和逆变续流混合瞬断模式进行比较分析。最后通过低压模型样机实验对分析结果进行验证。结果表明逆变续流混合瞬断模式是兼具其他两种控制模式优势的一个折中方案,既使控制策略相对简单、易于实现,又能提升短路故障电流切除速度,适度减轻续流管压力。
[Abstract]:All kinds of power system fault occurs, and is most likely to occur on the system and power equipment failure is the biggest fault. In order to suppress the short-circuit current caused by damage to the power equipment, enhance the reliability and stability of power system, the development of effective fault current limiting technology and current limiting device has become a hot topic in this paper. Study on a novel solid state fault design 220kV/1.5kA system based on the current practical prototype. The thesis focuses on the practical application of flow requirements and engineering system, optimize the design of the new type of solid-state current limiter device and the main circuit of electrical control and protection system. First, this paper briefly introduced at home and abroad of different types of short-circuit current limiter the current limiting principle, the advantages and disadvantages of various contrast converter in practical engineering applications, and ultimately determine the saturation type autotransformer coupling SSFCL as The new SSFCL practical prototype scheme. The paper detailed analysis of the saturated coupling transformer coupling SSFCL working principle, lay the foundation for the design of the main parameters of prototype equipment through the establishment of different state current limiter mathematical model. In addition, this paper introduces a new type solid state current limiter and flexible AC transmission technology, and to limit the flow of unified power flow controller (Unified Power Flow Controller, UPFC) as an example, the device current limiter module analyzes its influence on the transient stability of the power system, and Simulation in the standard 220kV three machine nine bus system. The simulation results show that after failure the unbalanced flow type UPFC can not only improve the generator input and output power of the power system, the power angle oscillation amplitude and duration is greatly reduced, but also can avoid the system bus voltage collapse Or, to improve the transient stability of power system. Secondly, according to the 220kV SSFCL industrial prototype main equipment optimization design, including the design of auto transformer saturation, thyristor type, pressure limiting valve selection, DC current limiting reactor design, cooling system, current voltage transformer and the bypass selection isolating switch and circuit breaker. A saturation type autotransformer coupling SSFCL main circuit model in ANSOFT/SIMPLORER simulation software, simulation was carried out under normal condition and short circuit conditions, compared with and without loading limits converter case line short-circuit current level, indicates that the main equipment designed to meet the requirements of current limiting. In addition, completed the design of limiter device overall layout scheme. Finally, the new SSFCL industrial prototype control protection system is designed, including hardware design and The realization of the software. The new SSFCL industrial prototype control protection system hardware used high performance real-time control system hardware platform of national instruments, mainly by the human-computer interaction system, the core controller, input / output module, signal conditioning module, photoelectric conversion module and other components. The control and protection system software is mainly composed of six state handling modules, each module is a clear division of labor and independent of each other. The new SSFCL low physical model prototype, the short-circuit current limiting experiment. Through the analysis of the operating conditions, further validation and improvement of the design of control and protection system. In addition, from the SSFCL control mode based on the freewheeling transient fault mode fault removal after short-circuit current limiting reactance, transient fault mode inverter and inverter current hybrid transient fault models are compared and analyzed. Finally, by low pressure die Prototype experiments are performed to verify the analysis results. The results show that the inverter freewheeling mixed transient fault model is a compromise with the other two control mode advantage, even if the control strategy is relatively simple, easy to implement, and can enhance the fault current resection rate, moderately reduce the freewheeling tube pressure.

【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM471

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