分布式永磁风力发电系统非线性负载无功补偿与谐波抑制

项目名称： 分布式永磁风力发电系统非线性负载无功补偿与谐波抑制

项目编号： No.51307121

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 电工技术

项目作者： 谷鑫

作者单位： 天津工业大学

项目金额： 25万元

中文摘要： 针对分布式并网型永磁风力发电系统变流器拓扑结构、控制方式以及安装位置与有源电力滤波器相似的特点，开展此类系统的负载无功补偿与谐波抑制的相关研究。通过建立永磁风力发电系统及非线性负载的动态离散化模型，分析系统有功功率稳定输出、无功功率实时补偿以及谐波电流同步抑制的暂态过程，进而基于内模控制策略实现有功和无功功率的无静差控制、基于多PR控制策略实现对主要谐波成分的针对性抑制，同时引入预测控制策略实现对各PR控制器参数的在线优化，以解决负载主要谐波频次突变造成的谐波抑制性能降低的问题。此外，通过改进谐波检测电流的方法、变换器的调制算法以及控制算法，提高算法运算效率，便于系统的数字实现。基于以上研究内容及成果，为分布式并网型永磁风力发电系统的非线性负载无功补偿与谐波抑制技术的进一步完善提供新的思路。

中文关键词： 风力发电系统；无功补偿；谐波抑制；比例谐振控制；预测控制

英文摘要： The reacitve power compensation and harmonic suppression of distributed cut-in permanent magnet synchronous generator (PMSG) wind energy conversion system (WECS) are discussed in this project, as the converter topology,control mehtods and installing position of the WECS are similar with that of active power filters. The transient processes of active power output, reactive power compensation and hamonic suppression are analized according to the dynamic discrete models of the PMSG WECS and nonlinear loads. Based on the analysis, the active and reactive power control without static error is implemented by using the interal model control strategy, and the main hamonic suppression is realized by using multi proportional-resonant (PR) control strategy. The parameters of PR controllers are optimized by taking advantage of predictive control principles for solving the problem of hamonic suppression deterioration which is the result of the nonlinear load changing. The hamonic current detection, converter modulation and control algorithm are improved for digital implementation of the system. The proposed method is a new idea for developing the reactive power compensation and harmonic suppression technology of distributed cut-in PMSG WECS.

英文关键词： Wind Energy Conversion System；Reactive Power Compensation；Harmonics Suppression；Proportional-Resonant (PR) Control Strategy；Predictive Control