基于空间矢量SPWM的控制算法最终版.doc

摘 要 随着资源的过度开采，全球能源形势的不断紧张。各国元首都将新能源的开发作为本国长期战略目标之一。逆变器作为光伏并网的关键所在，如何提高转换效率，减少系统对电网产生的负担成为众多学者研究的课题。本文针对6kw光伏并网系统模型，提出了新型的控制策略及仿真结果。具体实验内容如下： 文中首先根据并网逆变器的技术指标和总体设计思路，从几种常见的逆变拓扑结构中选择单相全桥电路作为设备的主电路。通过MOS管的导通与关断产生与正弦波等效的一组等幅不等宽脉冲信号。同时也产生了不必要的谐波损耗，通过对系统滤波电路的参数设计，尽可能的减少这部分无功损耗。 传统的并网控制器仅仅实现基本的逆变并网功能。本文采用基于空间矢量的SPWM（解耦）的控制算法，将给定电流解耦为有功电流分量和无功电流分量分别对逆变器输入电网的有功功率和无功功率进行闭环控制。在正常工作情况下，并网逆变器仅仅向电网传输有功功率；当电网接入过多的感性负载时，逆变器可以作为新型无功功率发生器，抵消这部分感性功率；同时，在夜间电网负荷较小情况下，并网控制器可以反向工作将电网电能整流后储存在蓄电池中，次日白天这部分电能与光伏板产生的电能一同输送给电网，达到削峰填谷的作用。 为了验证SPWM（解耦）控制策略的正确性，文中最后使用Matlab / Simulink软件对6kW的光伏单相逆变系统并入220V、50HZ电网进行模拟仿真。仿真结果表明，这项控制策略的确可以实现双向DC/AC变换，有功功率和无功功率分离控制。 关键词:单相全桥逆变；SPWM（解耦）；Matlab/Simulink仿真 Abstract With the over-exploitation of resources, the global energy situation continued tense. Which use solar energy for its clean, abundant sources of other advantages attracted widespread attention. As the key photovoltaic inverter network, how to improve conversion efficiency, reduce the burden on the grid system of as many scholars study. Aiming 6kw photovoltaic grid system model, a new control strategy and simulation results. Specific experiments are as follows: Firstly grid inverter according to the technical specifications and overall design ideas, choose single-phase full-bridge inverter circuit from several common topology as the primary circuit equipment. Also produced unwanted harmonic losses through the system filter circuit design parameters, as far as possible to reduce this part of the reactive power losses. The traditional grid controller and inverter only implement basic network functions. With the increasing complexity of the power system, customers efficient and reliable, features more complete and more popular grid inverter. In this paper, based SPWM (decoupling) space vector control algorithm, given the current decoupling of active current component and reactive current components are input to the inverter grid active and reactive power for closed-loop control. Under normal opera