基于粒子群优化光伏并网逆变器的研究

发布时间：2018-03-01 21:45

本文关键词： 光伏并网逆变器智能功率模块双闭环PI控制粒子群优化空间矢量调制　出处：《广西大学》2014年硕士论文　论文类型：学位论文

【摘要】：光伏并网逆变器作为能量转换与实时控制的关键装置,在提高并网电流质量及系统安全性等方面发挥着至关重要的作用。迄今为止,人们已对太阳能光伏逆变器进行了广泛的研究,但仍有许多问题有待进一步研究。本文在研究光伏并网逆变器电流控制策略基础上,对系统控制参数的优化进行了深入的研究。论文主要的工作如下： 1.光伏并网逆变器控制策略的研究。第一,通过分析光伏并网逆变器的拓扑结构,从而确定系统的主电路拓扑；第二,结合主电路的拓扑,分析光伏并网逆变器的工作原理,并推导光伏并网逆变器的数学模型；第三,根据数学模型,设计基于电压定向的双闭环空间矢量调制算法；最后,采用一种改进的粒子群算法离线优化光伏逆变器电压外环的PI参数。 2.控制策略的仿真研究。在MATLAB/Simulink里搭建系统仿真模型以及编写离线PSO程序,对所设计的双闭环空间矢量控制模型及离线粒子群优化方法进行仿真,并与未优化PI参数的系统进行对比分析,从而验证控制策略的可行性。 3.完成了系统的软硬件设计。硬件系统由主电路、控制电路、辅助电路组成。其中,主电路采用智能功率模块,控制电路包括DSP核心电路、电压电流采样调理电路以及电压过零点比较电路等。辅助电路是控制系统的电源电路。软件设计包括系统的主程序、锁相程序、ADC采样程序、中断程序、SVPWM程序等。 4.设计并制作了1台基于DSP2812的20kW实验样机,搭建了基于这一样机的实验平台,并分别进行了1.9kW、3.5kW、15kW的系统实验。研究结果表明,采用本文所提出控制算法设计的逆变器能将光伏阵列输出的直流电能快速、高效的变换成符合电网要求的交流电能,并能在一定干扰下稳定运行,从而验证了所采用控制策略的可行性。
[Abstract]:As a key device for energy conversion and real-time control, photovoltaic grid-connected inverter plays an important role in improving the quality of grid-connected current and system safety. Solar photovoltaic inverter has been widely studied, but there are still many problems to be further studied. In this paper, the current control strategy of photovoltaic grid-connected inverter is studied. The optimization of system control parameters is studied deeply. The main work of this paper is as follows:. 1. Research on the control strategy of grid-connected photovoltaic inverter. Firstly, the topology of the main circuit is determined by analyzing the topology of the grid-connected photovoltaic inverter; second, the working principle of the grid-connected photovoltaic inverter is analyzed in combination with the topology of the main circuit. The mathematical model of photovoltaic grid-connected inverter is deduced. Thirdly, based on the mathematical model, a double-closed loop space vector modulation algorithm based on voltage orientation is designed. An improved particle swarm optimization (PSO) algorithm is used to optimize the Pi parameters of the voltage outer loop of photovoltaic inverter. 2. Simulation study of control strategy. The system simulation model and off-line PSO program are built in MATLAB/Simulink, and the double closed loop space vector control model and off-line particle swarm optimization method are simulated. The feasibility of the control strategy is verified by comparison and analysis with the system without optimizing Pi parameters. 3. The hardware and software design of the system is completed. The hardware system is composed of main circuit, control circuit and auxiliary circuit. The main circuit adopts intelligent power module, and the control circuit includes DSP core circuit. The auxiliary circuit is the power supply circuit of the control system. The software design includes the main program of the system, the phase locking program, the ADC sampling program, the interrupt program and the SVPWM program, etc. 4. A 20kW experimental prototype based on DSP2812 is designed and made, and the experimental platform based on this prototype is built, and the system experiment of 1.9kW / 3.5kW / 15kW is carried out respectively. The results show that, The inverter designed by the control algorithm proposed in this paper can transform the output DC energy of photovoltaic array quickly and efficiently into AC energy which meets the requirements of power grid, and can operate stably under certain interference. The feasibility of the control strategy is verified.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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