本文選題：新型固態(tài)限流器　切入點(diǎn)：工作原理　出處：《浙江大學(xué)》2017年碩士論文

【摘要】：電力系統(tǒng)發(fā)生的各種故障中,最容易發(fā)生并且對(duì)系統(tǒng)運(yùn)行與電力設(shè)備破壞最大的是短路故障。為了抑制短路電流對(duì)電力設(shè)備造成的損害,增強(qiáng)電力系統(tǒng)可靠性與穩(wěn)定性,研制有效的短路限流技術(shù)與限流裝置已成為當(dāng)下研究熱點(diǎn)。本文在前人研究的基礎(chǔ)上,設(shè)計(jì)應(yīng)用于220kV/1.5kA系統(tǒng)的新型固態(tài)限流器實(shí)用化樣機(jī)。論文針對(duì)系統(tǒng)限流要求與工程實(shí)際應(yīng)用,對(duì)新型固態(tài)限流器主電路電氣裝置與控制保護(hù)系統(tǒng)進(jìn)行優(yōu)化設(shè)計(jì)。首先,論文簡(jiǎn)要分析了目前國(guó)內(nèi)外不同類型短路限流器的限流原理,對(duì)比各種限流器在實(shí)際工程應(yīng)用中的優(yōu)缺點(diǎn),最終確定以飽和型自耦變壓器耦合橋式固態(tài)限流器作為新型固態(tài)限流器實(shí)用化樣機(jī)方案。論文詳細(xì)分析了飽和型自耦變壓器耦合橋式固態(tài)限流器工作原理,通過建立不同狀態(tài)下的限流器數(shù)學(xué)模型為樣機(jī)主設(shè)備的參數(shù)設(shè)計(jì)打下基礎(chǔ)。此外,論文介紹了新型固態(tài)限流技術(shù)與柔性交流輸電技術(shù)的結(jié)合,并且以限流式統(tǒng)一潮流控制器(Unified Power Flow Controller,UPFC)為例,針對(duì)裝置中的限流器模塊分析其對(duì)電力系統(tǒng)暫態(tài)穩(wěn)定性的影響,并在標(biāo)準(zhǔn)的220kV三機(jī)九節(jié)點(diǎn)系統(tǒng)中進(jìn)行仿真。仿真結(jié)果表明在故障發(fā)生后,限流式UPFC不僅可以改善電力系統(tǒng)發(fā)電機(jī)輸入輸出功率的不平衡,使其功角振蕩的幅度和持續(xù)時(shí)間大大減小,而且可以避免系統(tǒng)母線電壓大幅下跌,提高了電力系統(tǒng)的暫態(tài)穩(wěn)定性。其次,論文針對(duì)220kV新型固態(tài)限流器工業(yè)樣機(jī)進(jìn)行主設(shè)備優(yōu)化設(shè)計(jì),包括飽和型自耦變壓器設(shè)計(jì)、晶閘管選型、限壓閥選型、直流限流電抗設(shè)計(jì)、冷卻循環(huán)系統(tǒng)選型、電流電壓互感器以及旁路隔離開關(guān)和斷路器的選型。在ANSOFT/SIMPLORER仿真軟件中建立飽和型自耦變壓器耦合橋式固態(tài)限流器主電路模型,進(jìn)行了正常工況與短路工況的聯(lián)合仿真,分析對(duì)比了有無裝設(shè)限流器情況下線路短路電流的水平,表明主設(shè)備設(shè)計(jì)滿足限流要求。此外,設(shè)計(jì)完成了限流器裝置整體布置方案。最后,論文針對(duì)新型固態(tài)限流器工業(yè)樣機(jī)控制保護(hù)系統(tǒng)進(jìn)行設(shè)計(jì),包括硬件設(shè)計(jì)與軟件實(shí)現(xiàn)。新型固態(tài)限流器工業(yè)樣機(jī)控制保護(hù)系統(tǒng)硬件選用美國(guó)國(guó)家儀器公司的高性能實(shí)時(shí)控制系統(tǒng)硬件平臺(tái),主要由人機(jī)交互系統(tǒng)、核心控制器、輸入/輸出模塊、信號(hào)調(diào)理模塊、光電轉(zhuǎn)換模塊等部分組成。控制保護(hù)系統(tǒng)的軟件主要由六大狀態(tài)處理模塊組成,各模塊分工明確且相互獨(dú)立。研制出新型固態(tài)限流器低壓物理模型樣機(jī),進(jìn)行了短路限流實(shí)驗(yàn)。通過對(duì)其運(yùn)行工況的分析,進(jìn)一步驗(yàn)證和完善了控制保護(hù)系統(tǒng)的設(shè)計(jì)。此外,從新型橋式固態(tài)限流器控制模式出發(fā),對(duì)故障后切除限流電抗短路電流的續(xù)流瞬斷模式、逆變瞬斷模式和逆變續(xù)流混合瞬斷模式進(jìn)行比較分析。最后通過低壓模型樣機(jī)實(shí)驗(yàn)對(duì)分析結(jié)果進(jìn)行驗(yàn)證。結(jié)果表明逆變續(xù)流混合瞬斷模式是兼具其他兩種控制模式優(yōu)勢(shì)的一個(gè)折中方案,既使控制策略相對(duì)簡(jiǎn)單、易于實(shí)現(xiàn),又能提升短路故障電流切除速度,適度減輕續(xù)流管壓力。
[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.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM471

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