【作者】 张雪群；

【导师】 曾岳南；

【作者基本信息】 广东工业大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 在电力系统中,电压和电流应是完好的正弦波。但是在实际的电力系统中,由于非线性负载的影响,实际的电网电压和电流波形总是存在不同程度的畸变,给电力输配电系统及附近的其它电气设备带来许多问题,因而就有必要采取措施限制其对电网和其它设备的影响。高功率因数电能变换和负载电能回馈电网的实现是电力节能的关键问题。为使电压型PWM整流器网侧呈现电流源特性,其网侧电流控制显得十分重要。在PWM整流技术发展过程中,电压型PWM整流器网侧电流控制策略主要分为两类:一类是“间接电流控制”策略;另一类是目前占主要地位的“直接电流控制”策略。“直接电流控制”相对于“间接电流控制”有着快速的电流效应和好的鲁棒性,本文采用固定开关频率三角波比较的直接电流控制方法。本文对单相PWM整流器进行了分析,推导出了相应的数学模型和控制结构框图。针对单相PWM整流器建模难和电流、电压控制环的PI调节器设计难的问题,提出了一种基于古典线性控制对非线性进行线性化和输入输出能量守恒相结合的单相PWM整流器的PI调节器的设计方法。分别对电流、电压控制环的调节器进行了选型和参数设计,并对改进型PR调节器进行了设计验证。为了抑制系统输出直流电压的跌落及消除电压谐波,采用了基于系统数学模型的电压补偿控制对其进行了有效的抑制,能得到稳定且谐波含量少的输出直流电压。本文对单相PWM整流器的拓扑结构进行了选择,并对系统主电路,IGBT整流桥的驱动电路,直流电压、交流电流及电网电压同步信号的采样电路,DSP控制电路等进行了设计以及软件设计。通过仿真验证了系统能很好实现高功率因数电能变换和电能的双向流动,进行的部分实验验证了PWM脉冲控制的合理性和正确性,具有一定的理论价值和应用价值。更多还原

【Abstract】 In the electrical power system, The voltage and the electric current should be complete sine waves. But in the actual electrical power system. As a result of misalignment load influence, the actual network voltage and the current waveform always have the varying degree distortion which bring many questions for the electric power distribution system and the neighbor other electrical equipment. Therefore has the necessity to take the measure to. limit it to the electrical network and other equipment’s influence.The high power factor electrical energy transformation and load electrical energy back coupling electrical network’s realization is key question of the electric power energy conservation.. In order to cause the voltage PWM rectifier net side to present the current supply characteristic, Its net side current control appears very important. In PWM rectification technological development process, The voltage PWM rectifier net side current control strategy mainly divides into two kinds: One kind is "the indirect current control" strategy, Another kind is "the direct current control" strategy which occupies the main status at present. "the direct current control" is opposite in "the indirect current control" has the fast electric current effect and the good robustness. This article uses the fixed turn-on frequency triangular wave comparison direct current control method.This article has carried on the analysis to the single-phase PWM rectifier and Inferred the corresponding mathematical model and the control structure diagram. In view of the difficulty of single-phase PWM rectifier modelling and the difficulty of the electric current and voltage control link’s PI regulator designs, proposing one kind of single-phase PWM rectifier’s PI regulator’s design method which based on the classical linear control to the misalignment linearized and the input output energy conservation unifies. To the electric current, the voltage control link’s regulator has carried on the shaping and the parameter design separately and has carried on the design confirmation to the advanced version PR regulator. In order to suppress the system output DC voltage depreciation and eliminate the voltage harmonics, voltage compensation control based on the system mathematical model used to carried on effective suppression and obtain stably, and few harmonic content output DC voltage.This article has carried on the choice to the single-phase PWM rectifier’s topology, to system main circuit, IGBT rectification bridge’s driving circuit, DC voltage, alternating current and network voltage synchronized signal sampling circuit, the DSP control circuit and as well as software design. And confirmed the system through the simulation to be able very good to realize the high power factor electrical energy transformation and the electrical energy two-way flow. Carries on part experimental verification PWM pulse control rationality and accuracy, having certain theory value and the application value.更多还原