【摘要】：近年來,隨著高電壓長(zhǎng)距離輸電線路的不斷建設(shè)和發(fā)展,無(wú)功平衡和電壓控制的問題日漸突出。CRT(Controllable Reactor of Transformer Type,變壓器式可控電抗器)是一種輸出容量連續(xù)平滑調(diào)節(jié)的新型無(wú)功補(bǔ)償裝置,能夠?qū)崿F(xiàn)線路無(wú)功的快速補(bǔ)償,并維持電網(wǎng)電壓穩(wěn)定,因其性能優(yōu)良,優(yōu)點(diǎn)突出,近年來得到廣泛的關(guān)注與研究。CRT主要由一個(gè)工作繞組,多級(jí)控制繞組以及與控制繞組本身串聯(lián)的限流電感和晶閘管閥組構(gòu)成。控制繞組作為CRT的重要組成部分,其結(jié)構(gòu)和成本影響著CRT整體的工作特性、結(jié)構(gòu)復(fù)雜度和制造成本等方面。因此,本文以CRT為研究對(duì)象,主要開展以下幾方面的研究,包括CRT控制繞組分級(jí)標(biāo)準(zhǔn)確定,多種工作模式下的控制繞組參數(shù)計(jì)算,控制繞組晶閘管閥組結(jié)構(gòu)的確定以及CRT控制繞組參數(shù)的優(yōu)化設(shè)計(jì)。具體內(nèi)容如下:(1)基于CRT工作原理,對(duì)其主要組成部分、工作模式的分類和優(yōu)缺點(diǎn)進(jìn)行分析。根據(jù)以CRT諧波含有率作為控制繞組分級(jí)標(biāo)準(zhǔn)時(shí)存在的問題,結(jié)合電網(wǎng)對(duì)諧波的要求,確定以諧波電流有效值作為CRT新的控制繞組分級(jí)標(biāo)準(zhǔn)。(2)選取CRT三種典型的單支路工作模式為研究對(duì)象,對(duì)其各自工作原理進(jìn)行詳細(xì)分析,結(jié)合不同工作模式的特點(diǎn),確定CRT控制繞組參數(shù)計(jì)算的方法。基于CRT新的控制繞組分級(jí)標(biāo)準(zhǔn),推導(dǎo)得出三種單支路工作模式下的控制繞組級(jí)數(shù)和控制繞組電流的計(jì)算公式,并對(duì)不同工作模式下控制繞組級(jí)數(shù)大小進(jìn)行比較。(3)通過分析CRT晶閘管閥組結(jié)構(gòu)及其影響因素,確定晶閘管閥組結(jié)構(gòu)參數(shù)(串聯(lián)的反并聯(lián)晶閘管級(jí)數(shù)和并聯(lián)的反并聯(lián)晶閘管級(jí)數(shù))的計(jì)算公式,并基于此提出CRT晶閘管閥組結(jié)構(gòu)設(shè)計(jì)的兩種方法,分別為電壓已知時(shí)晶閘管閥組結(jié)構(gòu)設(shè)計(jì)方法和電流已知時(shí)晶閘管閥組結(jié)構(gòu)設(shè)計(jì)方法。(4)在對(duì)不同工作模式控制繞組參數(shù)計(jì)算的基礎(chǔ)上,為簡(jiǎn)化CRT繞組結(jié)構(gòu),降低其制造成本,本文以CRT控制繞組成本最小為優(yōu)化目標(biāo),根據(jù)CRT晶閘管閥組結(jié)構(gòu)的不同設(shè)計(jì)方法建立不同的控制繞組成本優(yōu)化模型。選取遺傳算法作為優(yōu)化算法,基于MATLAB遺傳算法工具箱對(duì)所建立的目標(biāo)函數(shù)進(jìn)行優(yōu)化,并對(duì)優(yōu)化結(jié)果進(jìn)行對(duì)比分析。
[Abstract]:In recent years, with the continuous construction and development of high voltage and long distance transmission lines, the problems of reactive power balance and voltage control have become increasingly prominent in. CRT (Controllable Reactor of Transformer Type, Transformer controllable reactor (TRC) is a new type of reactive power compensation device with continuous and smooth regulation of output capacity. It can realize fast compensation of line reactive power and maintain the voltage stability of the power network because of its excellent performance and outstanding advantages. CRT is mainly composed of a working winding, a multi-stage control winding, a current-limiting inductance and a thyristor valve set in series with the control winding itself. As an important part of CRT, the structure and cost of control winding affect the overall working characteristics, structural complexity and manufacturing cost of CRT. Therefore, this paper takes CRT as the research object, mainly carries on the following research, including the CRT control winding classification standard determination, the control winding parameter calculation under various working modes, The structure of control winding thyristor valve group and the optimization design of CRT control winding parameters are discussed. The main contents are as follows: (1) based on the working principle of CRT, the main components, classification, advantages and disadvantages of the working mode are analyzed. According to the existing problems when CRT harmonic content rate is used as the grading standard of control windings, combined with the requirements of power grid for harmonics, The effective value of harmonic current is chosen as the new control winding classification standard of CRT. (2) three typical single branch working modes of CRT are selected as the research object, and their working principles are analyzed in detail, and the characteristics of different working modes are combined. The calculation method of CRT control winding parameters is determined. Based on the new control winding classification standard of CRT, the calculation formulas of control winding series and control winding current under three single branch working modes are derived. The series of control windings in different working modes are compared. (3) the structure of CRT thyristor valve group and its influencing factors are analyzed. The calculation formulas of the structural parameters of the thyristor valve group (the series of thyristors in series and the series of thyristors in parallel connection) are determined. Based on this, two methods for the structural design of the CRT thyristor valve group are put forward. The design methods of thyristor valve group structure when voltage is known and thyristor valve group structure design method when current is known respectively. (4) on the basis of calculating parameters of control windings in different working modes, the structure of CRT windings is simplified. In order to reduce the manufacturing cost, the cost optimization model of CRT control winding is established according to the different design methods of CRT thyristor valve group. The genetic algorithm is selected as the optimization algorithm, and the objective function is optimized based on the MATLAB genetic algorithm toolbox, and the optimization results are compared and analyzed.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM47

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