混合多梯度光伏并网逆变方法及控制研究

项目名称： 混合多梯度光伏并网逆变方法及控制研究

项目编号： No.51507155

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 电工技术

项目作者： 王要强

作者单位： 郑州大学

项目金额： 21万元

中文摘要： 受光照、温度等环境因素的影响，光伏阵列输出电压与功率存在波动性强、变化范围大等问题。为此，本项目拟以拓展光伏并网发电系统功率运行范围的上、下限为出发点，开展混合多梯度光伏并网逆变方法及其控制技术的研究。首先，根据拓扑组合约束条件，构建一族满足多梯度并网要求的复合逆变拓扑，并探索其统一构成规律，揭示其混合多梯度并网工作的机理；然后，在拓扑族不同工作梯级并网逆变控制及拓扑族子单元功率均衡控制研究的基础上，确定拓扑族不同工作模态间的动态调整机制，研究各工作模态间的柔性过渡策略，实现光伏并网发电系统在光伏阵列输出电压大范围变化下的多梯度持续、高效运行。最后，搭建实验平台对复合光伏并网逆变拓扑族及其多梯度并网控制方法的有效性进行实验验证。项目的开展将对光伏并网发电系统工作性能的改善起到积极的推动作用，且项目的思路和采取的方法也可以为风力发电等其他新能源发电形式提供借鉴。

中文关键词： 光伏发电；多梯度并网；拓扑调整；柔性过渡；功率均衡

英文摘要： Affected by light, temperature and other environmental factors, there are various problems that exists in photovoltaic array output voltage and power, such as strong fluctuation, large variation range, etc. Therefore, this project intends to take the bidirectional expansion of power operation range of PV grid-integration system as a starting point, to carry out research on hybrid multi-gradient grid-inversion method and control techniques for photovoltaic generation system. Firstly, according to the topology combination constraints, a family of complex inverter topologies that can meet the requirements of multi-gradient grid-integration is built, its unified constitution law explored, and the working mechanism of its hybrid multi-gradient grid-integration is revealed. And then, on the basis of research on grid-connected inversion control of deferent topology working steps and power balancing control of topology sub-units, the dynamic adjustment mechanism among deferent working modals of topology family is determined. Furthermore, the flexible transition strategy among deferent working modals is studied, making the PV grid-integrated generation system work sustainably and efficiently under the condition of large variation of PV array output voltage. Finally, an experimental platform is built to verify the effectiveness of complex photovoltaic inversion topology family and its multi-gradient grid-integration control method. The conduction of this project will play a positive promoting role to the working performance improvement of PV grid-integrated generation system, and the project ideas and methods adopted can also be taken as a helpful reference to other new energy generation systems such as wind generation.

英文关键词： Photovoltaic Generation;Multi-gradient Grid-integration;Topology Adjustment;Flexible Transition;Power Balance