發(fā)布時間：2018-03-23 17:18

  本文選題：PWM變流器　切入點：直接功率控制　出處：《沈陽工業(yè)大學(xué)》2016年碩士論文

【摘要】：伴隨著光伏、風(fēng)力發(fā)電等諸多可再生能源發(fā)電比重的持續(xù)提升以及環(huán)保意識的增強和能源壓力的增加,高滲透率環(huán)境下的新能源發(fā)電的不間斷隨機接入,為配電網(wǎng)的順利運作提出了新的要求。主動配電網(wǎng)是一種能夠?qū)崿F(xiàn)充放電設(shè)備和電網(wǎng)互動、大規(guī)模間歇式新能源并網(wǎng)運行控制以及智能配用電等諸多電網(wǎng)運行和剖析的關(guān)鍵技術(shù)的高效、合理地處理方案。怎樣研發(fā)制造有關(guān)智能電力設(shè)備,并實施無功補償、電壓調(diào)節(jié)、諧波治理、可再生能源的接入與轉(zhuǎn)換是當(dāng)前電力電子設(shè)備亟待解決的關(guān)鍵性問題。本文主要以主動配電網(wǎng)環(huán)境下電能轉(zhuǎn)換與電能質(zhì)量的共通的重要技術(shù)問題、脈沖寬度調(diào)制(PWM)為對象展開具體地分析與探索,從而達成高質(zhì)量、動態(tài)化的控制作用的目標。同時,開展了信號檢測、自理論分析、仿真探索、實驗檢驗再至詳細程序的代碼的實現(xiàn)、功率分析、控制手段的探索以及數(shù)學(xué)建模等工作,從而在技術(shù)與理論方面為主動配電網(wǎng)有關(guān)智能電能電力設(shè)備的研發(fā)、制造打下基礎(chǔ)。本篇論文的工作主要有:(1)創(chuàng)設(shè)數(shù)學(xué)模型,開展功率分析計算工作。運用開關(guān)函數(shù)描述法確定在abc靜止坐標系下,三相電壓型PWM變流器的數(shù)學(xué)模型。從瞬時功率理論中我們可推導(dǎo)出abc靜止坐標系下功率計算公式,通過對坐標變換的手段的分析,獲取到等功率變換與等量變換的靜止坐標系以及dq同步旋轉(zhuǎn)坐標系下的功率的計算。(2)對PWM變流器主要發(fā)揮出逆變與整流功能,站在電力系統(tǒng)無功功率與瞬時有功功率控制的角度,制定一種新式的準直接功率控制方案。運用外環(huán)功率與內(nèi)環(huán)定頻的結(jié)構(gòu),在考慮到電流內(nèi)環(huán)保護的基礎(chǔ)上嚴格控制功率流向。另外,提供控制仿真結(jié)果與控制器參數(shù)設(shè)計手段,從仿真結(jié)果中可看出PWM變流器的高質(zhì)量、動態(tài)控制目標的達成狀態(tài)。(3)出具在abc坐標的基礎(chǔ)上的PWM變流器自然坐標控制手段,它涵蓋了無交流電壓傳感器控制手段、直接電流控制手段以及直接功率控制手段。就PWM變流器交流側(cè)的相電壓以及工程積分替換以往的微分方式,得到與每相磁鏈相近的值,依靠磁鏈估算與相電壓估算模塊達到無交流電壓傳感器控制的目標。依據(jù)新式的準直接功率控制策略的理念,通過功率外環(huán)、電流內(nèi)環(huán)的手段,做好基于自然坐標下的直接功率控制工作。
[Abstract]:With the continuous increase in the proportion of renewable energy generation, such as photovoltaic, wind power generation and so on, as well as the increasing awareness of environmental protection and the increase of energy pressure, the uninterrupted random access of new energy generation in high permeability environment. New requirements are put forward for the smooth operation of distribution network. Active distribution network is a kind of active distribution network that can realize the interaction between charging and discharging equipment and power grid. How to develop and manufacture intelligent power equipment, how to develop and manufacture intelligent power equipment, how to implement reactive power compensation and voltage regulation, how to deal with the key technologies of power grid operation and analysis, such as large-scale intermittent new energy grid operation control and intelligent distribution power supply, etc. Harmonic control, access and conversion of renewable energy are the key problems to be solved urgently in power electronic equipment. In this paper, the important technical problems of power conversion and power quality in active distribution network environment are discussed. Pulse width Modulation (PWM) is the object of specific analysis and exploration, so as to achieve the goal of high quality and dynamic control. At the same time, signal detection, self-theoretical analysis and simulation exploration are carried out. The realization of code, power analysis, exploration of control means and mathematical modeling, etc., in order to develop intelligent power equipment for active distribution network in technology and theory. The main work of this paper is to create a mathematical model and carry out power analysis and calculation. The switching function description method is used to determine the abc stationary coordinate system. The mathematical model of three-phase voltage source PWM converter. From the instantaneous power theory, we can deduce the power calculation formula in the abc stationary coordinate system, through the analysis of the means of coordinate transformation, The static coordinate system of equal power transformation and equal quantity transformation and the power calculation in dq synchronous rotation coordinate system are obtained. The main functions of inverter and rectifier for PWM converter are obtained. From the point of view of reactive power and instantaneous active power control in power system, a new quasi-direct power control scheme is developed. Considering the current inner loop protection, the power flow direction is strictly controlled. In addition, the control simulation results and controller parameter design means are provided. From the simulation results, the high quality of the PWM converter can be seen. The natural coordinate control method of PWM converter based on abc coordinates, which covers the control means without AC voltage sensor, Direct current control and direct power control. For the phase voltage and engineering integral of the AC side of the PWM converter, the previous differential method is replaced, and the value is close to that of each phase flux. Based on the idea of new quasi-direct power control strategy, the method of power outer loop and current inner loop is used to achieve the goal of non-AC voltage sensor control based on flux estimation and phase voltage estimation module. Do a good job of direct power control based on natural coordinates.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM727

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