【摘要】：三相PWM整流器具有直流側(cè)輸出電壓穩(wěn)定、能量雙向流動、輸入功率因數(shù)高、交流側(cè)輸入電流諧波含量小等優(yōu)點。隨著電力電子技術(shù)的發(fā)展，三相PWM整流器廣泛地應(yīng)用于直流傳動系統(tǒng)、電力系統(tǒng)、儲能系統(tǒng)等工業(yè)領(lǐng)域。 本文通過分析三相PWM整流器的拓?fù)浣Y(jié)構(gòu)，得出了其穩(wěn)定運行在整流狀態(tài)、逆變狀態(tài)、無功補償狀態(tài)時，交流側(cè)輸入電流、電網(wǎng)電壓、端電壓與交流側(cè)輸入有功功率和無功功率的關(guān)系。介紹了空間矢量調(diào)制技術(shù)的原理，及其實現(xiàn)方法。建立了三相PWM整流器在三種常用坐標(biāo)系下的數(shù)學(xué)模型；為了消除兩相旋轉(zhuǎn)dq坐標(biāo)系下dq軸的互相耦合項ωL,加入了前饋解耦控制算法。通過分析電流內(nèi)環(huán)和電壓外環(huán)的控制框圖，得出PI調(diào)節(jié)器的比例系數(shù)和積分系數(shù)的計算方法。搭建了基于matlab仿真平臺的三相PWM整流器的仿真模型，仿真結(jié)果證明了控制算法的正確性。 本文為了解決三相PWM整流器啟動時產(chǎn)生沖擊電流的問題，分析了啟動沖擊電流產(chǎn)生的原因，提出了分段啟動控制策略以及實現(xiàn)分段啟動控制策略的具體步驟：電流內(nèi)環(huán)的分段啟動控制、電壓外環(huán)的分段啟動控制，給出了參數(shù)的計算方法。搭建了基于matlab仿真平臺的三相PWM整流器啟動時的仿真模型，仿真結(jié)果證明分段啟動控制策略能夠有效地抑制其啟動時產(chǎn)生的沖擊電流。 本文設(shè)計了三相PWM整流器的實驗平臺，，給出主電路的交流側(cè)濾波電感、直流側(cè)母線電容的計算方法。設(shè)計了以DSP為核心的控制板，控制板包括采樣電路、保護電路、電源電路、PWM控制電路等。三相PWM整流器的DSP程序主要包括：主程序、EPWM1計數(shù)器下溢中斷程序、外部中斷1程序、外部中斷2程序、ECAP1捕獲中斷程序，同時給出每個程序的流程圖。通過分析每個程序的流程圖，對其響應(yīng)過程進(jìn)行說明。實驗結(jié)果證明分段啟動控制能夠有效地抑制三相PWM整流器的啟動沖擊電流，同時還能解決啟動時直流側(cè)輸出電壓的超調(diào)問題。
[Abstract]:Three-phase PWM rectifier has the advantages of stable DC side output voltage, two-way energy flow, high input power factor and low harmonic content of AC side input current. With the development of power electronic technology, three-phase PWM rectifier is widely used in DC drive system, power system, energy storage system and other industrial fields. By analyzing the topology of three-phase PWM rectifier, it is obtained that the AC side input current and power network voltage can operate stably in the state of rectifier, inverter and reactive power compensation. The relationship between terminal voltage and AC input active power and reactive power. The principle and implementation of space vector modulation are introduced. The mathematical model of three-phase PWM rectifier in three common coordinate systems is established, and a feedforward decoupling control algorithm is added in order to eliminate the mutual coupling term 蠅 L of the dq axis in the two-phase rotating dq coordinate system. By analyzing the control block diagram of current inner loop and voltage outer loop, the calculation method of the proportion coefficient and integral coefficient of PI regulator is obtained. The simulation model of three-phase PWM rectifier based on matlab simulation platform is built, and the simulation results prove the correctness of the control algorithm. In order to solve the problem of impulse current generated by three-phase PWM rectifier during startup, this paper analyzes the causes of starting impulse current. The piecewise startup control strategy and the concrete steps to realize the piecewise start control strategy are put forward: the subsection start control of the current inner loop and the subsection start control of the voltage outer loop. The calculation method of the parameters is given. The simulation model of three-phase PWM rectifier based on matlab simulation platform is built. The simulation results show that the piecewise startup control strategy can effectively suppress the impulse current generated by the three-phase PWM rectifier. In this paper, the experimental platform of three-phase PWM rectifier is designed, and the calculation method of AC side filter inductor and DC side busbar capacitance of main circuit is given. A control board based on DSP is designed. The control board includes sampling circuit, protection circuit, power circuit and PWM control circuit. The DSP program of three-phase PWM rectifier mainly includes: main program EPWM1 counter overflow interrupt program, external interrupt 1 program, external interrupt 2 program ECAP1 capture interrupt program. At the same time, the flow chart of each program is given. By analyzing the flow chart of each program, the response process is explained. The experimental results show that the piecewise startup control can effectively suppress the starting impulse current of the three-phase PWM rectifier and solve the overshoot problem of the DC side output voltage during startup.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM461

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