發(fā)布時間：2018-01-19 18:30

  本文關(guān)鍵詞： 混合三相電力平衡技術(shù) 特殊電抗器設(shè)計 三相不平衡治理 DSP Simulink 仿真　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著科學(xué)技術(shù)的發(fā)展及生產(chǎn)生活水平的上升,居民負荷的類型日益豐富,用電量連年攀升。在低壓配電系統(tǒng)中,三相不平衡、諧波等電能質(zhì)量問題日益突出,對低壓配電系統(tǒng)的穩(wěn)定運行及用電安全造成影響。有源電力濾波技術(shù)雖然諧波處理能力強大,但是價格昂貴且不適合處理零序電流。本課題同山東邦世電氣有限公司合作,開發(fā)有源無源混合的三相電力平衡器。本文首先陳述了三相不平衡問題的危害及治理措施,講述了部分國家三相不平衡度的定義,明確了國標中對三相不平衡度的定義。然后講述了三相電力平衡技術(shù)及電力濾波技術(shù)的發(fā)展現(xiàn)狀,簡要的陳述了各種電能質(zhì)量治理技術(shù)的優(yōu)缺點。在此基礎(chǔ)上,本文介紹了混合三相電力平衡技術(shù)的基本結(jié)構(gòu)及原理,說明了混合三相電力平衡技術(shù)在三相不平衡問題治理上的優(yōu)越性�；旌先嚯娏ζ胶馄鞯臒o源模塊由兩個特殊的電抗器構(gòu)成,他們是零序阻斷器(ZSBT)和曲折接線變壓器(Zig-Zag變壓器)。其中Zig-Zag變壓器實際上是只有一次側(cè)繞組的曲折接線的接地變壓器,但其額定電壓為400V,它的設(shè)計是在傳統(tǒng)變壓器設(shè)計的基礎(chǔ)上根據(jù)其自身特點進行設(shè)計,并制作樣機進行實際測試。ZSBT是三個相線繞組繞在同一鐵芯柱上的電抗器,它的設(shè)計是在傳統(tǒng)電抗器設(shè)計方法的基礎(chǔ)上根據(jù)其自身結(jié)構(gòu)特點設(shè)計出其主要參數(shù),然后在ANSOFT中建立3D仿真模型,分析修正其主要參數(shù),最后制作樣機進行實際測試�；旌先嚯娏ζ胶馄鞯挠性茨K主要包括電流檢測、主電路、電流跟蹤、PWM控制。電流檢測方法的種類很多,本文采用基于瞬時無功理論的方法檢測不平衡電流及諧波電流,并且在Simulink中建立電流檢測的仿真模型,進行仿真分析。本文的PWM控制方式采用直流電壓利用率較高的SVPWM控制方式,并在DSP中編寫跟蹤正弦電壓矢量的C語言程序,驗證其效果。本文采用相對于二電平逆變電路更加穩(wěn)定的二極管鉗位的三電平逆變電路作為主電路,并介紹了其基本結(jié)構(gòu)及工作原理。電流跟蹤方式采用PI+重復(fù)控制的方法,對其流程圖進行推導(dǎo)分析�；旌先嚯娏ζ胶馄鞯目刂葡到y(tǒng)是基于DSPTMS320F28335的控制系統(tǒng),以DSP的工業(yè)核心板為核心器件,設(shè)計三相電壓、三相電流及直流側(cè)電壓等模擬量的檢測電路、過零檢測等開關(guān)量檢測電路、電源電路、輸出放大轉(zhuǎn)化電路、通信電路。在硬件設(shè)計的基礎(chǔ)上,本文根據(jù)混合電力平衡器的控制要求設(shè)計了相對應(yīng)的控制軟件。最后,本文根據(jù)設(shè)計的混合三相電力平衡器在Simulink中建立仿真模型,對電力平衡器進行分析,并根據(jù)已有的實驗條件對樣機進行測試分析。
[Abstract]:With the development of science and technology and the rise of production and living standard, the type of resident load is becoming more and more abundant, and the electricity consumption is rising year after year. In the low voltage distribution system, the power quality problems such as three-phase imbalance and harmonic are becoming more and more prominent. It has an impact on the stable operation of low-voltage distribution system and the safety of power consumption. Although the active power filter technology is powerful in harmonic processing. But the price is expensive and it is not suitable to deal with zero sequence current. This paper first describes the harm of the three-phase imbalance problem and its treatment measures, and describes the definition of three-phase imbalance degree in some countries. The definition of three-phase unbalance in national standard is clarified. Then the development of three-phase power balance technology and power filter technology are described, and the advantages and disadvantages of various power quality treatment techniques are briefly stated. This paper introduces the basic structure and principle of hybrid three-phase power balance technology. The advantages of hybrid three-phase power balance technology in the treatment of three-phase imbalance problem are explained. The passive module of hybrid three-phase power balancer consists of two special reactors. They are ZSBT (zero sequence blocker) and Zig-Zag transformers with zigzag wiring. Among them, Zig-Zag transformers are actually ground transformers with only one side winding with a zigzag connection. But its rated voltage is 400V, its design is based on the traditional transformer design according to its own characteristics. ZSBT is a reactor with three phase wire windings wrapped on the same core column. Its design is based on the traditional reactor design method according to its own structural characteristics to design its main parameters, and then in ANSOFT 3D simulation model, analysis and correction of its main parameters. The active module of the hybrid three-phase power balancer mainly includes current detection, main circuit, current tracking PWM control. There are many kinds of current detection methods. In this paper, the method based on instantaneous reactive power theory is used to detect the unbalanced current and harmonic current, and the simulation model of current detection is established in Simulink. The PWM control mode in this paper adopts the SVPWM control mode with high DC voltage utilization, and compiles the C language program to track the sinusoidal voltage vector in DSP. In this paper, the diode clamped three-level inverter circuit, which is more stable than the two-level inverter circuit, is used as the main circuit. The basic structure and working principle of the system are introduced. The Pi repetitive control method is used in the current tracking mode. The control system of hybrid three-phase power balancer is based on DSPTMS320F28335 and takes the industrial core board of DSP as the core device. Three phase voltage, three phase current and DC side voltage analog detection circuit, zero detection and other switching detection circuit, power circuit, output amplifier conversion circuit, communication circuit. On the basis of hardware design. The corresponding control software is designed according to the control requirements of the hybrid power balancer. Finally, the simulation model of the hybrid three-phase power balancer is established in Simulink. The power balancer is analyzed, and the prototype is tested and analyzed according to the existing experimental conditions.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM714.3;TM732

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