用户端单相SVG的无功电流跟踪算法  

Tracking algorithm of reactive current in single-phase client SVG

作　　者：郑宏[1] 杨祥令[1] 孙玉坤[1] 白雪飞[1] 罗林[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2009年第4期387-391,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省科技攻关计划项目(BE2007069);江苏省研究生培养创新工程项目(CH07B_102z)

摘　　要：针对直接电流控制的用户端单相SVG,提出一种新的单相无功电流跟踪算法.在一个计算周期内,用锁相环电路得到与电源电压同频率滞后1/4周期的标准正弦波与负载电流乘积后,结果存入采样数据储存队列,然后比较队列中基波周期前后一段数据,以快速跟踪无功电流.仿真结果表明,该算法在一个周期内能够实现对无功电流的准确提取,而且对电流变化跟踪效果理想,防干扰能力强.算法简单快速,只需两个乘法器,易于实现.A simple tracking algorithm for single-phase reactive current detection was proposed aimed at the single-phase client SVG with the direct-current-control-strategy. Within one caculation period,the algorithm used the phase-locked loop （PLL） circuit to gain the product of load current and standard sine wave which was of the same frequency and voltage with the supply voltage but lagged behind 1/4 cycle. The product results were stored into a storage queue of sampling data. The reactive current was fast trackled by comparing the sampled data pre and post the cycle of fundamental wave in the queue. The results of analysis show that the reactive cunent can be accurately extracted in one cycle and the tracking effect of the cun＇ent change is good and the anti-interference capability is obvious. The algorithm is simple and fast, and needs only 2 multipliers, so it can be easily realized.

关 键 词：SVG 无功电流检测 单相系统 跟踪算法 无功补偿 

分 类 号：TM761.22[电气工程—电力系统及自动化]