【摘要】：隨著智能電網(wǎng)的高速發(fā)展,對低壓配電網(wǎng)絡(luò)的電能質(zhì)量和降低損耗提出了更高的要求,而三相負(fù)載不平衡是影響它們的重要因素。如果不采用合理高效的手段治理配電網(wǎng)中的三相不平衡,可能就會(huì)影響整個(gè)電力系統(tǒng)安全穩(wěn)定的運(yùn)行。因此,低壓配電網(wǎng)中三相不平衡問題成為人們研究的熱點(diǎn)。通常對于低壓網(wǎng)段三相負(fù)荷不平衡的治理,常用的是無功補(bǔ)償裝置和智能換相開關(guān)。雖然兩者均能達(dá)到治理的目的,但前者由于其較高的成本和較大的體積使其不利于在市場中廣泛的應(yīng)用,而后者大都是基于機(jī)械觸點(diǎn)開關(guān)來進(jìn)行換相,會(huì)對供電質(zhì)量產(chǎn)生較大的影響。因此,本文設(shè)計(jì)了全電容補(bǔ)償?shù)臒o功補(bǔ)償方案和固態(tài)智能換相開關(guān)兩種三相不平衡治理方案,具體工作主要包括:1.介紹了無功補(bǔ)償和相間負(fù)荷調(diào)整的應(yīng)用發(fā)展現(xiàn)狀,總結(jié)了兩種三相不平衡度的計(jì)算方法,分析了三相不平衡對配電變壓器、輸電線路、發(fā)電機(jī)等帶來的危害,概述了電力相關(guān)部門常采用的解決三相不平衡的措施。2.從無功補(bǔ)償角度,分析了無功補(bǔ)償原理和三相功率平衡化現(xiàn)象。通過分析典型單相負(fù)荷的不平衡補(bǔ)償,進(jìn)而引出了基于理想補(bǔ)償網(wǎng)絡(luò)的三相負(fù)荷補(bǔ)償模型,并對該模型進(jìn)行仿真分析。接著針對理想補(bǔ)償網(wǎng)絡(luò)中存在的不足,設(shè)計(jì)了矢量分析的補(bǔ)償策略,并推得了其數(shù)學(xué)模型。3.以矢量分析補(bǔ)償策略為基礎(chǔ),設(shè)計(jì)了基于全電容的編組復(fù)合開關(guān)無功補(bǔ)償方案。針對該方案中與補(bǔ)償電容值相關(guān)的基波電流有功和無功分量檢測問題,設(shè)計(jì)了空間矢量變換的電流檢測方法。通過對方案進(jìn)行仿真分析,驗(yàn)證了其可行性。4.最后從負(fù)荷相序調(diào)整角度,設(shè)計(jì)了基于固態(tài)智能換相開關(guān)的三相不平衡治理方案。通過對固態(tài)智能換相開關(guān)進(jìn)行仿真,驗(yàn)證了其在換相過程中電壓中斷時(shí)間大大的縮短。接著詳細(xì)的介紹了該治理方案中各個(gè)主要功能模塊和最優(yōu)換相策略的獲得過程,同時(shí)建立了三相不平衡優(yōu)化模型,并采用加速粒子群智能優(yōu)化算法對模型求解。通過實(shí)驗(yàn)仿真分析,驗(yàn)證了所建立的模型和求解方法的可行性。
[Abstract]:With the rapid development of smart grid, the power quality and loss reduction of low-voltage distribution network are required higher, and three-phase load imbalance is an important factor affecting them. If we do not use reasonable and efficient means to control the three-phase imbalance in the distribution network, it may affect the safe and stable operation of the whole power system. Therefore, the problem of three-phase imbalance in low-voltage distribution network has become a hot topic. Reactive power compensator and intelligent commutation switch are commonly used for the treatment of unbalanced three-phase load in low voltage network. Although both can achieve the goal of governance, the former, because of its high cost and large volume, is not conducive to its wide application in the market, while the latter is mostly based on mechanical contact switches for commutation. Will have a greater impact on the quality of power supply. Therefore, the reactive power compensation scheme of full capacitance compensation and the two three phase imbalance control schemes of solid state intelligent commutation switch are designed in this paper. The main work includes: 1. This paper introduces the application and development of reactive power compensation and interphase load adjustment, summarizes two calculation methods of three-phase unbalance, analyzes the harm of three-phase unbalance to distribution transformer, transmission line, generator, etc. The measures to solve the three-phase imbalance commonly adopted by power-related departments. 2. 2. From the angle of reactive power compensation, the principle of reactive power compensation and the phenomenon of three-phase power balance are analyzed. By analyzing the unbalanced compensation of typical single-phase load, a three-phase load compensation model based on ideal compensation network is proposed, and the model is simulated and analyzed. Then, the compensation strategy of vector analysis is designed for the deficiency of ideal compensation network, and its mathematical model. 3. Based on the compensation strategy of vector analysis, the reactive power compensation scheme of marshalling compound switch based on full capacitance is designed. In order to detect the active and reactive components of the fundamental current which is related to the compensation capacitance, a space vector transform (SVT) current detection method is designed. The feasibility of the method is verified by simulation and analysis. Finally, from the point of view of load phase sequence adjustment, a three phase imbalance control scheme based on solid state intelligent commutation switch is designed. Through the simulation of the solid-state intelligent commutation switch, it is verified that the voltage interruption time is greatly shortened during the commutation process. Then the process of obtaining the main function modules and the optimal commutation strategy is introduced in detail. At the same time, the three-phase unbalanced optimization model is established, and the accelerated particle swarm optimization algorithm is used to solve the model. The feasibility of the established model and the solving method are verified by simulation.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM732

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 方恒福;盛萬興;王金麗;梁英;王金宇;王思源;;配電臺(tái)區(qū)三相負(fù)荷不平衡實(shí)時(shí)在線治理方法研究[J];中國電機(jī)工程學(xué)報(bào);2015年09期

2 張明;謝珊珊;羅云峰;;低壓配電網(wǎng)三相負(fù)荷不平衡優(yōu)化模型的研究[J];武漢科技大學(xué)學(xué)報(bào);2015年01期

3 胡應(yīng)宏;王建賾;任佳佳;紀(jì)延超;;不平衡負(fù)載的平衡分量法分解及補(bǔ)償方法[J];中國電機(jī)工程學(xué)報(bào);2012年34期

4 王晴;;三相負(fù)荷不平衡調(diào)整開關(guān)及其應(yīng)用[J];農(nóng)村電氣化;2011年08期

5 周林;張有玉;劉強(qiáng);馬永強(qiáng);武劍;;三相不平衡度算法的比較研究[J];華東電力;2010年02期

6 韋鋼;陳森環(huán);蔡陽;盧煒;;基于瞬時(shí)無功功率理論的三相不平衡負(fù)荷補(bǔ)償[J];電力自動(dòng)化設(shè)備;2010年02期

7 林志雄;李天友;蔡金錠;;低壓配電網(wǎng)三相不平衡全電容調(diào)節(jié)補(bǔ)償?shù)难芯縖J];供用電;2009年06期

8 李清川;;三相不平衡負(fù)載新型無功補(bǔ)償算法的研究[J];有色設(shè)備;2009年04期

9 田吉花;;TCR+FC靜止無功補(bǔ)償裝置(SVC)的原理及應(yīng)用[J];科技信息;2009年17期

10 周宇英;宋t熦，

本文編號(hào)：2195953