發(fā)布時(shí)間：2018-07-24 20:20

【摘要】：傳統(tǒng)變電站高壓側(cè)無功集中補(bǔ)償與諧波治理方法接入點(diǎn)電壓等級(jí)高,結(jié)構(gòu)復(fù)雜、成本昂貴;而采用低壓用戶側(cè)就地補(bǔ)償,裝置安裝分散、利用率較低且缺乏有效的協(xié)調(diào),控制不當(dāng)易帶來新的電能質(zhì)量問題。配電變壓器集成化靜止補(bǔ)償技術(shù)(Distribution Transformer STATCOM,DT-STATCOM)將配電變壓器繞組作為電力補(bǔ)償裝置的接入點(diǎn),降低了補(bǔ)償裝置的耐壓要求,兼有集中補(bǔ)償?shù)男Ч?但是在裝置拓?fù)浣Y(jié)構(gòu)、接入方式以及控制策略等方面仍有待進(jìn)一步研究。本文以配電網(wǎng)電能質(zhì)量綜合治理為目標(biāo),提出了采用配電變壓器高壓側(cè)繞組中心抽頭集成方式的級(jí)聯(lián)型DT-STATCOM,并對(duì)無功、諧波和不平衡補(bǔ)償控制方法展開深入研究。首先,構(gòu)建了級(jí)聯(lián)型DT-STATCOM系統(tǒng)結(jié)構(gòu)方案。根據(jù)配電網(wǎng)實(shí)際情況,采用Dyn型配電變高壓繞組中心抽頭集成方式、級(jí)聯(lián)H橋拓?fù)浣Y(jié)構(gòu)和LC輸出濾波器構(gòu)成DT-STATCOM系統(tǒng)。建立了各部分的數(shù)學(xué)模型,分析了補(bǔ)償注入電流對(duì)變壓器繞組電流分布及高低壓側(cè)的影響,建立了級(jí)聯(lián)型多電平變流器狀態(tài)方程,分析了由LC輸出濾波器和變壓器抽頭漏抗組成的緊湊型LCL結(jié)構(gòu)的濾波特性,驗(yàn)證了系統(tǒng)可行性。然后,研究了無功電流補(bǔ)償、諧波電流補(bǔ)償及無功諧波綜合補(bǔ)償控制方法。基于瞬時(shí)無功理論,對(duì)適用于跨端口補(bǔ)償?shù)臒o功及諧波電流檢測方法開展了研究。提出了一種PI控制與PR控制相結(jié)合的諧波與無功綜合控制策略。采用載波移相SPWM技術(shù)進(jìn)行指令電流跟蹤,分析了其調(diào)制原理、數(shù)學(xué)模型及傳輸特性。搭建Matlab/Simulink仿真平臺(tái),進(jìn)行仿真實(shí)驗(yàn),驗(yàn)證了上述方法的有效性。最后,針對(duì)三相不平衡負(fù)載,研究了負(fù)序電流補(bǔ)償控制方法及其與無功電流補(bǔ)償相結(jié)合的綜合補(bǔ)償控制方法。針對(duì)不平衡補(bǔ)償對(duì)級(jí)聯(lián)型變流器各相橋臂有功輸出的影響,指出了不平衡補(bǔ)償?shù)挠行Х秶�。研究了跨端口的�?fù)序電流檢測與控制方法和直流電容均壓控制方法,并進(jìn)行了仿真實(shí)驗(yàn),驗(yàn)證了上述方法的有效性。
[Abstract]:Traditional reactive Power compensation and Harmonic treatment method for High Voltage side of Substation access Point has high voltage grade, complex structure and high cost, while local compensation with low voltage user side is used, the installation is dispersed, the utilization ratio is low and there is no effective coordination. Improper control is easy to bring about new power quality problems. The integrated static compensation technology of distribution transformer (Distribution Transformer STATCOMDT-STATCOM takes the winding of distribution transformer as the access point of the power compensation device, which reduces the voltage requirement of the compensator and has the effect of centralized compensation. Access methods and control strategies are still to be further studied. In this paper, a cascade DT-STATCOM-based DT-STATCOM-based control method for reactive power, harmonic and unbalanced compensation is proposed, which adopts the integrated mode of central tap of high-voltage side windings of distribution transformers, aiming at the comprehensive control of power quality in distribution networks. Firstly, a cascade DT-STATCOM system architecture is constructed. According to the actual situation of distribution network, the DT-STATCOM system is composed of Dyn type distribution transformer high-voltage winding center tap integration mode, cascaded H-bridge topology structure and LC output filter. The mathematical model of each part is established, the influence of compensating injection current on the current distribution of transformer winding and the high and low voltage side is analyzed, and the state equation of cascaded multilevel converter is established. The filter characteristics of compact LCL structure composed of LC output filter and transformer tap leakage reactance are analyzed and the feasibility of the system is verified. Then, the reactive current compensation, harmonic current compensation and reactive harmonic comprehensive compensation control methods are studied. Based on instantaneous reactive power theory, reactive and harmonic current detection methods suitable for cross-port compensation are studied. An integrated harmonic and reactive power control strategy based on Pi control and PR control is proposed. The modulation principle, mathematical model and transmission characteristics are analyzed by using carrier phase-shifted SPWM technique to track the command current. The Matlab/Simulink simulation platform is built and the simulation experiments are carried out to verify the effectiveness of the above method. Finally, the negative sequence current compensation control method and the integrated compensation control method combined with reactive current compensation are studied for the three-phase unbalanced load. Aiming at the influence of unbalanced compensation on active power output of each phase bridge arm of cascade converter, the effective range of unbalanced compensation is pointed out. The negative sequence current detection and control method and the DC capacitor voltage sharing control method are studied, and the simulation experiments are carried out to verify the effectiveness of the above methods.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM63;TM714.3

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