基于模型预测的光伏并网逆变器并联控制研究  

Parallel Control of Photovoltaic Grid Connected Inverter Based on Model Prediction Control

作　　者：何婷 乔俊强 常勇[3] HE Ting;QIAO Junqiang;CHANG Yong(Gansu Natural Energy Research Institute,Lanzhou Gansu 730046,China;Key Laboratory of Photovoltaic of Gansu Province,Lanzhou Gansu 730046,China;College of Electrical and Information Engineering,Lanzhou University qf Technology,Lanzhou Gansu 730050,China)

机构地区：[1]甘肃自然能源研究所,甘肃兰州730046 [2]甘肃省太阳能光伏重点实验室,甘肃兰州730046 [3]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《电子器件》2022年第5期1187-1194,共8页Chinese Journal of Electron Devices

基　　金：兰州市人才创新创业项目(2021-RC-78)。

摘　　要：由于并联逆变器硬件参数差异和控制信号无法完全同步,使光伏并网逆变器之间存在零序环流,从而影响光伏发电厂的电能质量及系统可靠性。提出了一种模型预测算法来抑制零序环流,在同步旋转d-q-z坐标系下建立逆变器并联系统的状态空间模型,在此基础上构建模型预测控制模型,以调节注入电网的电流为控制目标,在成本函数中引入z轴分量使流经逆变器的环流最小。与PI控制器相比,所提出的基于模型预测的逆变器并联控制系统能够提高电能质量,在抑制零序环流方面具有良好的性能。Due to the difference of hardware parameters of parallel inverters and the control signal can not be fully synchronized, there is zero sequence circulating current between photovoltaic grid connected inverters, which affects the power quality and system reliability of photovoltaic power plants.In this study, a model predictive algorithm is proposed to suppress the zero sequence circulating current. The state space model of the parallel inverter system is established in the synchronous rotating d-q-z coordinate system. On this basis, the model predictive control model is constructed. The control objective is to adjust the current injected into the grid, and the z-axis component is introduced into the cost function to minimize the circulating current flowing through the inverter.Compared with PI controller, the proposed parallel inverter control system based on model prediction can improve power quality and has good performance in restraining zero sequence circulating current.

关 键 词：模型预测 三相电压型逆变器 逆变器并联 环流抑制 

分 类 号：TM464[电气工程—电器]