DSP控制可编程交流电源的研究与设计

发布时间：2018-12-13 10:04

【摘要】：交流电压源是电源实验室与科研机构必不可少的工具，在研发和产品测试中，依据电压幅值、输出频率和输出波形的要求不同，许多试验的顺利进行都需要为其提供多种不同的交流电，因此，可编程交流电源的研究与设计具有很高的工程应用价值。本文基于DSP控制，设计了功率为1kW的可编程交流电源。电源主电路拓扑采用交—直—交结构，由前级单相PWM整流电路和后级单相全桥逆变电路两级构成，经理论分析和计算对系统中电感和电容的参数做出合理取值。分别对前后级电路进行小信号建模，通过观测系统开环频率特性，设计电压和电流环调节器参数，使系统具有良好的稳定性和快速的动态响应。PWM整流电路采用双极性调制，直流母线电压外环和电感电流内环的控制方案，电路在稳态时处于高功率因数运行，为优化调制输出电压波形，提高直流电压的利用率，直流母线电压根据逆变输出电压幅值在一定范围内可调。针对直流母线上的二倍频波动，设计了二倍频陷波器，有效地阻止扰动反馈进入控制系统而引入更高次的谐波。逆变电路采用单极性倍频调制方式，输出电压外环，电感电流反馈和负载电流前馈相结合电流内环的控制方案，使系统具有较高的带宽，，实现宽电压、宽频率范围逆变，具有模拟电压突增、突减，可叠加20次以内谐波模拟电压失真输出等功能。分别对前后级进行PSpice仿真验证后，对整个电源系统进行仿真。搭建了主电路实验平台，控制电路选用TI公司的数字信号处理器TMS320F2812作为控制芯片，通过编写C语言程序，完成了可编程交流电源的样机实验，实验结果验证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.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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