摘要
光伏并网发电是光伏发电应用发展的趋势。并网逆变器是光伏并网发电系统核心部件之一,基于DSPIC30F6010A芯片控制的并网系统,利用DSP丰富的外围电路和强大的功能实现并网系统的所有工作、控制和相应的保护功能等。针对输出电流谐波含量大的特点,提出了基于同步PI内环控制和直流电压前馈外环控制的双闭环电流控制思路,并网逆变器采用前级DC/DC的boost升压结构电路,减少系统体积和重量;后级DC/AC逆变器采用全桥逆变电路;且具有最大功率跟踪和反孤岛效应等功能。仿真和实验证明:利用提出的算法,可有效减少并网电流的谐波,光伏并网系统具有可靠性强,工作效率高,稳定性好等优点。
PV Grid-connected Generation is one of the trends of the development and application of the Solar Energy PV Generation. Grid-connected inverter is one of the core components in PV Grid-connected Generation system controlled by DSPIC30F6010A. Operation, control and protection of PV Grid-connected Generation system are realized by DSP with its rich peripheral circuits and powerful features. According to the character of the former system with high output- current harmonic content, double closed-loop control scheme was proposed and designed based on synchronous inner loop control and voltage feed-forward outer loop control. Grid-connected inverter adopted the front DC/DC boost structure converter circuit, and the volume and weight of the system were reduced; the later DC/AC inverter was h- bridge circuit with maximum power point tracking and anti-islanding function etc. Simulation and experiment have shown that： with proposed algorithm, harmonics of grid current was reduced efficiently, and many advantages were achieved, such as strong credibility, high efficiency and good stability.
出处
《能源工程》
2008年第5期13-16,共4页
Energy Engineering
