【摘要】：交流電壓源是電源實(shí)驗(yàn)室與科研機(jī)構(gòu)必不可少的工具，在研發(fā)和產(chǎn)品測試中，依據(jù)電壓幅值、輸出頻率和輸出波形的要求不同，許多試驗(yàn)的順利進(jìn)行都需要為其提供多種不同的交流電，因此，可編程交流電源的研究與設(shè)計具有很高的工程應(yīng)用價值。 本文基于DSP控制，設(shè)計了功率為1kW的可編程交流電源。電源主電路拓?fù)洳捎媒弧薄唤Y(jié)構(gòu)，由前級單相PWM整流電路和后級單相全橋逆變電路兩級構(gòu)成，經(jīng)理論分析和計算對系統(tǒng)中電感和電容的參數(shù)做出合理取值。分別對前后級電路進(jìn)行小信號建模，通過觀測系統(tǒng)開環(huán)頻率特性，設(shè)計電壓和電流環(huán)調(diào)節(jié)器參數(shù)，使系統(tǒng)具有良好的穩(wěn)定性和快速的動態(tài)響應(yīng)。PWM整流電路采用雙極性調(diào)制，直流母線電壓外環(huán)和電感電流內(nèi)環(huán)的控制方案，電路在穩(wěn)態(tài)時處于高功率因數(shù)運(yùn)行，為優(yōu)化調(diào)制輸出電壓波形，提高直流電壓的利用率，直流母線電壓根據(jù)逆變輸出電壓幅值在一定范圍內(nèi)可調(diào)。針對直流母線上的二倍頻波動，設(shè)計了二倍頻陷波器，有效地阻止擾動反饋進(jìn)入控制系統(tǒng)而引入更高次的諧波。逆變電路采用單極性倍頻調(diào)制方式，輸出電壓外環(huán)，電感電流反饋和負(fù)載電流前饋相結(jié)合電流內(nèi)環(huán)的控制方案，使系統(tǒng)具有較高的帶寬，，實(shí)現(xiàn)寬電壓、寬頻率范圍逆變，具有模擬電壓突增、突減，可疊加20次以內(nèi)諧波模擬電壓失真輸出等功能。 分別對前后級進(jìn)行PSpice仿真驗(yàn)證后，對整個電源系統(tǒng)進(jìn)行仿真。搭建了主電路實(shí)驗(yàn)平臺，控制電路選用TI公司的數(shù)字信號處理器TMS320F2812作為控制芯片，通過編寫C語言程序，完成了可編程交流電源的樣機(jī)實(shí)驗(yàn)，實(shí)驗(yàn)結(jié)果驗(yàn)證了控制方案的可行性和有效性。
[Abstract]:Ac voltage source is an indispensable tool in power supply laboratory and scientific research institution. In the research and development and product testing, according to the voltage amplitude, the output frequency and the output waveform requirements are different. Many experiments need to provide a variety of alternating current. Therefore, the research and design of programmable AC power supply has a high engineering application value. Based on DSP control, a programmable AC power supply with power of 1kW is designed in this paper. The main circuit topology of the power supply adopts the AC-DC-AC structure, which consists of the former single-phase PWM rectifier circuit and the rear single-phase full-bridge inverter circuit. Through theoretical analysis and calculation, the parameters of inductance and capacitance in the system are reasonably selected. The small signal modeling of the front and rear circuits is carried out, and the parameters of voltage and current loop regulator are designed by observing the open loop frequency characteristics of the system. The system has good stability and fast dynamic response. The PWM rectifier circuit adopts bipolarity modulation. The control scheme of DC bus voltage outer loop and inductor current inner loop, the circuit runs in high power factor in steady state, in order to optimize the modulation output voltage waveform, improve the utilization rate of DC voltage. The DC bus voltage can be adjusted in a certain range according to the amplitude of the output voltage of the inverter. Aiming at the double frequency fluctuation on the DC bus, a double frequency notch is designed, which can effectively prevent the disturbance feedback from entering the control system and introduce higher harmonics. The inverter circuit adopts unipolar frequency doubling modulation mode, output voltage outer loop, inductance current feedback and load current feedforward combined with current inner loop control scheme, which makes the system have higher bandwidth and achieve wide voltage and wide frequency range inverter. With analog voltage sudden increase, sudden decrease, can stack 20 harmonics analog voltage distortion output and so on. After PSpice simulation, the whole power supply system is simulated. The main circuit experiment platform is set up. The control circuit uses TMS320F2812, a digital signal processor of TI Company, as the control chip. By writing C language program, the prototype experiment of programmable AC power supply is completed. The experimental results show that the control scheme is feasible and effective.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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