动态电压恢复器检测算法及补偿策略研究

发布时间：2018-07-05 17:52

本文选题：电压暂降 + 动态电压恢复器　；参考：《西安科技大学》2017年硕士论文

【摘要】：随着用电设备的技术革新,电压暂降问题造成的影响也越来越突出。动态电压恢复器(DVR)是进行电压暂降治理最为有效的补偿设备,在发生电压暂降时可保证敏感负荷电压的持续稳定,避免用电用户因电压暂降造成不必要的经济损失。本文以DVR为研究对象,进行电压暂降检测算法与补偿策略的研究。第一,对比分析常用的三种主电路拓扑,选择了控制更加灵活的由三单相全桥构成的变流器作为本课题研究的DVR主电路;第二,针对系统频率发生偏移时,传统αβ-dp检测算法存在的检测误差,采用了基于αβ-dp的变步长差分检测算法。该算法可保证在检测时效性的同时避免了频率偏移带来的检测误差。第三,针对传统最小能量补偿策略不能在输出最小有功功率时保证补偿时间最长的问题,依据电容放电特性得到角度跳变与补偿时间的关系,通过对其进行数学优化计算后,得到最佳相位跳变角从而使得最小能量补偿可以在任何情况下补偿时间最长。最后,借助Simulink仿真软件搭建了 DVR系统仿真模型,并分别模拟在单相故障、两相故障、三相故障的情况下进行了仿真验证。仿真结果表明由基于αβ-dp的变步长差分检测算法与改进的最小能量补偿策略构成的DVR系统响应速度快、跟踪效果好、抗干扰能力强及补偿精度高,有效延长了补偿时间,达到了预期效果。
[Abstract]:With the technical innovation of electric equipment, the impact of voltage sag is becoming more and more prominent. Dynamic voltage restorer (DVR) is the most effective compensation equipment for voltage sag treatment. It can ensure the stability of sensitive load voltage when voltage sag occurs and avoid unnecessary economic loss caused by voltage sag. In this paper, DVR is taken as the research object, voltage sag detection algorithm and compensation strategy are studied. First, by comparing and analyzing the three common main circuit topologies, the converter composed of three single-phase full-bridge is selected as the DVR main circuit. Secondly, when the frequency of the system is offsetting, The traditional 伪尾 -dp detection algorithm is based on the variable step size differential detection algorithm based on 伪尾 -dp. The algorithm can avoid the detection error caused by frequency offset while ensuring the timeliness of detection. Thirdly, aiming at the problem that the traditional minimum energy compensation strategy can not guarantee the longest compensation time when the minimum active power is output, the relationship between angle jump and compensation time is obtained according to the characteristics of capacitance discharge. The optimal phase jump angle is obtained so that the minimum energy compensation can be the longest compensation time in any case. Finally, the simulation model of DVR system is built with Simulink simulation software, and the simulation results are verified in the case of single-phase fault, two-phase fault and three-phase fault respectively. The simulation results show that the DVR system composed of the variable step size differential detection algorithm based on 伪尾 -dp and the improved minimum energy compensation strategy has the advantages of fast response speed, good tracking effect, strong anti-interference ability and high compensation accuracy, and effectively prolongs the compensation time. The expected effect has been achieved.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761.12

【参考文献】