摘 要
随着电力电子技术的发展，动态电压恢复器（DVR）作为改善电能质量的有效装置，在电力系统中的应用日益广泛。为解决配电网中电压暂降问题，本研究旨在设计并实现一种高性能的DVR。针对传统DVR存在的补偿精度低、响应速度慢等问题，提出了一种基于改进型瞬时无功功率理论的检测算法与自适应重复控制策略相结合的方法。该方法能够快速准确地检测出电压扰动，并通过自适应调整控制参数提高系统的动态性能和稳态精度。在硬件设计方面，采用模块化设计理念，构建了以数字信号处理器为核心控制器的DVR硬件平台，包括主电路、驱动电路、采样电路等部分。软件设计上，编写了完整的控制程序，实现了对DVR的初始化配置、故障诊断以及实时数据采集与处理等功能。实验结果表明，所设计的DVR能够在电网发生电压暂降时迅速做出反应，在10ms内完成电压补偿，使负载端电压恢复正常水平，且补偿后的电压波形失真度小于2%，有效提高了供电可靠性。本研究提出的检测算法与控制策略具有创新性，为DVR的实际应用提供了新的思路和技术支持，对于提升电力系统的电能质量和稳定性具有重要意义。
关键词：动态电压恢复器 电压暂降补偿 改进型瞬时无功功率理论
Abstract
With the development of power electronics technology, Dynamic Voltage Restorer (DVR) has become an effective device for improving power quality and is increasingly applied in power systems. To address voltage sags in distribution networks, this study aims to design and implement a high-performance DVR. In response to the issues of low compensation accuracy and slow response speed in traditional DVRs, an improved instantaneous reactive power theory-based detection algorithm combined with an adaptive repetitive control strategy is proposed. This method can rapidly and accurately detect voltage disturbances and enhance the dynamic performance and steady-state accuracy of the system through adaptive adjustment of control parameters. For hardware design, a modular design concept was adopted to construct a DVR hardware platform centered on a digital signal processor, including components such as the main circuit, drive circuit, and sampling circuit. In software design, comprehensive control programs were developed to achieve initialization configuration, fault diagnosis, and real-time data acquisition and processing for the DVR. Experimental results demonstrate that the designed DVR can respond promptly to voltage sags in the grid, completing voltage compensation within 10ms to restore the load-end voltage to normal levels, with post-compensation voltage waveform distortion less than 2%, thereby significantly enhancing power supply reliability. The detection algorithm and control strategy proposed in this study are innovative, providing new ideas and technical support for practical applications of DVRs, which is crucial for improving the power quality and stability of power systems.
Keyword:Dynamic Voltage Restorer Voltage Sag Compensation Improved Instantaneous Reactive Power Theory
目 录
引言 1
1动态电压恢复器概述 1
1.2电力系统电能质量问题 1
2DVR的关键技术研究 2
2.1控制策略分析 2
2.2补偿算法设计 2
2.3储能装置选型 3
3DVR的硬件实现方案 3
3.1主电路拓扑设计 4
3.2功率器件选择 4
3.3滤波器参数确定 5
4DVR的软件系统开发 5
4.1控制系统架构 5
4.2故障检测机制 6
4.3性能优化方法 6
结论 7
参考文献 8
致谢 9
