三相LC型独立逆变器双闭环谐波抑制策略研究

发布时间：2018-03-17 04:20

本文选题：逆变器　切入点：比例谐振　出处：《陕西科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：传统三相逆变器的基本控制思想是将三相静止坐标系上的信号经过两次坐标转换后,把交流信号等效成直流信号,用比例积分控制器进行控制。该控制策略虽然能够达到一定的控制效果,但对逆变器输出波形的谐波抑制效果有限。对于新的控制器,如无差拍控制,重复控制以及预测控制等,在实际应用中各有优缺点。本文以抑制电压谐波为目的,对三相LC型独立逆变器的双闭环控制策略进行了研究,主要研究内容如下:(1)比例谐振控制器的深入研究。通过增加截止频率构成准比例谐振控制器,防止控制器离散化过程导致跟踪频率偏移,从而在基波频率的增益变小。逆变器采用准比例谐振控制器能够得到较好的输出特性,然而准比例谐振控制器对其他频率点的谐波抑制效果不理想。通过增加准谐振控制器构成多重准比例谐振控制器可对5次和7次谐波进行抑制。(2)比例复数积分控制器的深入研究。根据经典控制理论中所述的系统输出跟踪输入的原理,通过交流量稳态误差的求解方法,从线性系统叠加原理和频域分析的角度出发,详细阐述了比例复数积分控制器在基波频率处有无穷大增益的原理。在比例复数积分控制器的基础上,通过增加截止频率和积分环节,提出了准比例复数积分加积分的控制器。(3)通过MATLAB/simulink软件搭建了软件仿真模型,分别对双闭环比例积分控制策略、双闭环多重准比例谐振控制策略、双闭环准比例复数积分控制策略以及双闭环准比例复数积分加积分的控制策略进行了仿真研究。(4)实验平台的搭建与实验。在实验室TLI-X00模块化电力电子平台的基础上,设计并制作了一个LC滤波器,用于滤波和实时采集滤波器的电容电压及电感电流的值。软件实现了空间矢量脉宽调制过程。配置了TMS320F28335的e PWM模块寄存器和ADC采样模块寄存器,从而产生PWM驱动信号和实现采样功能。通过搭建的逆变实验平台对双闭环多重准比例谐振控制策略和双闭环准比例复数积分加积分的控制策略进行了实验验证。仿真和实验结果表明,双闭环准比例复数积分加积分的控制策略相比于研究的其余三种控制策略既能有效抑制谐波,又能有效抑制负载突变导致的电流扰动,达到良好的控制效果。
[Abstract]:The basic control idea of the traditional three-phase inverter is to convert the signals in the three-phase stationary coordinate system into DC signals after two coordinate conversions. Although the control strategy can achieve certain control effect, the harmonic suppression effect of inverter output waveform is limited. For the new controller, for example, no beat control, Repetitive control and predictive control have their merits and demerits in practical application. In this paper, the double closed-loop control strategy of three-phase LC independent inverter is studied in order to suppress voltage harmonics. The main research contents are as follows: (1) A further study of the proportional resonance controller. By increasing the cutoff frequency, the quasi-proportional resonant controller is constructed to prevent the discrete process of the controller from causing the tracking frequency deviation. As a result, the gain of the fundamental frequency becomes smaller, and the output characteristics of the inverter can be obtained by using the quasi-proportional resonant controller. However, the harmonic suppression effect of quasi-proportional resonance controller on other frequency points is not ideal. By adding quasi-resonant controller, multi-quasi proportional resonance controller can suppress the fifth and seventh harmonics. According to the principle of system output tracking input described in classical control theory, Based on the principle of superposition of linear system and the analysis of frequency domain, the steady-state error of AC quantity is solved. The principle that the proportional complex integral controller has infinite gain at the fundamental frequency is described in detail. On the basis of the proportional complex integral controller, the cutoff frequency and integral link are increased. In this paper, the controller of quasi-proportional complex integral plus integral is put forward. The software simulation model is built by MATLAB/simulink software. The control strategy of double closed loop proportional integral and double closed loop multiple quasi proportional resonance is proposed, respectively. The control strategy of double closed loop quasi-proportional complex integral and the control strategy of double closed loop quasi-proportional complex integral plus integral are simulated and studied. The experimental platform is built and tested. Based on the TLI-X00 modular power electronics platform in laboratory, the control strategy of double closed loop quasi-proportional complex integral and the control strategy of double closed-loop quasi-proportional complex integral plus integral are simulated. A LC filter is designed and fabricated, which is used to filter and collect the capacitance voltage and inductance current of the filter in real time. The space vector pulse width modulation process is realized by the software. The e PWM module register and the ADC sampling module register of TMS320F28335 are configured. The PWM driving signal is generated and the sampling function is realized. The control strategy of double closed loop multiplex quasi-proportional resonance control and double closed loop quasi-proportional complex integral plus integral is verified by using the inverter experimental platform. The simulation and experimental results show that, Compared with the other three control strategies, the double closed loop quasi-proportional complex integral plus integral control strategy can effectively suppress the harmonic and the current disturbance caused by the sudden change of load, and achieve a good control effect.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464

【参考文献】