微电网光储多源协调及多模式平滑切换控制

Photovoltaic-storage Multi-source Coordination and Multi-mode Smooth Switching Control of Micro-grid

传统新能源微电网由于微源(光伏(PV)、储能)种类的不同,存在逆变器种类较多、系统整体控制层级复杂等缺点。针对光储微电网供电系统,提出整合传统光伏、储能逆变器于一体的两级式光储微电网逆变结构,实现了光伏组件与储能设备的多源协调管理。基于所提架构详细分析了光储多源协调供电系统控制方案,实现了新能源光储微电网在孤岛与并网模态下稳定工作,以及不同工作模态下的平滑切换控制。同时针对孤岛模态下负载不平衡等问题,提出了光储微电网逆变器机端电压平衡控制策略。最后通过搭建额定功率15 kVA光储微电网逆变器原理样机,对所提新能源光储微电网逆变拓扑及控制方案可行性开展了实验验证。

Due to the different types of micro-sources(photovoltaic(PV),energy storage),the traditional new energy micro-grid has many kinds of inverters and complex control level of the system.Aiming at PV-storage micro-grid power supply system,a two-stage PV-storage micro-grid inverter structure integrating traditional PV and energy storage inverters is proposed,which realizes the multi-source coordination management of PV modules and energy storage equipment.Based on the proposed architecture,the control scheme of the PV-storage multi-source coordination power supply system is analyzed in detail,and the stable operation of the new energy PV-storage micro-grid under the isolated and grid-connected modes and the smooth switching control under different working modes are realized.At the same time,aiming at the problems of load unbalance in isolated mode,the generator terminal voltage balance control strategy of PV-storage micro-grid inverter is further proposed.Finally,the feasibility of the proposed new energy PVstorage micro-grid inverter topology and control scheme is experimentally verified by the built PV-storage micro-grid inverter principle prototype with rated power of 15 kVA.