【摘要】：近年來,隨著高電壓長距離輸電線路的不斷建設和發(fā)展,無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)平滑調節(jié)的新型無功補償裝置,能夠實現線路無功的快速補償,并維持電網電壓穩(wěn)定,因其性能優(yōu)良,優(yōu)點突出,近年來得到廣泛的關注與研究。CRT主要由一個工作繞組,多級控制繞組以及與控制繞組本身串聯的限流電感和晶閘管閥組構成。控制繞組作為CRT的重要組成部分,其結構和成本影響著CRT整體的工作特性、結構復雜度和制造成本等方面。因此,本文以CRT為研究對象,主要開展以下幾方面的研究,包括CRT控制繞組分級標準確定,多種工作模式下的控制繞組參數計算,控制繞組晶閘管閥組結構的確定以及CRT控制繞組參數的優(yōu)化設計。具體內容如下:(1)基于CRT工作原理,對其主要組成部分、工作模式的分類和優(yōu)缺點進行分析。根據以CRT諧波含有率作為控制繞組分級標準時存在的問題,結合電網對諧波的要求,確定以諧波電流有效值作為CRT新的控制繞組分級標準。(2)選取CRT三種典型的單支路工作模式為研究對象,對其各自工作原理進行詳細分析,結合不同工作模式的特點,確定CRT控制繞組參數計算的方法。基于CRT新的控制繞組分級標準,推導得出三種單支路工作模式下的控制繞組級數和控制繞組電流的計算公式,并對不同工作模式下控制繞組級數大小進行比較。(3)通過分析CRT晶閘管閥組結構及其影響因素,確定晶閘管閥組結構參數(串聯的反并聯晶閘管級數和并聯的反并聯晶閘管級數)的計算公式,并基于此提出CRT晶閘管閥組結構設計的兩種方法,分別為電壓已知時晶閘管閥組結構設計方法和電流已知時晶閘管閥組結構設計方法。(4)在對不同工作模式控制繞組參數計算的基礎上,為簡化CRT繞組結構,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,根據CRT晶閘管閥組結構的不同設計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遺傳算法工具箱對所建立的目標函數進行優(yōu)化,并對優(yōu)化結果進行對比分析。
[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.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM47

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