光储一体化微电网及其系统控制策略

PV-storage Integrated Micro-grid and Its System Control Strategy

传统光储微电网由于微源种类的不同,存在逆变器种类较多,系统整体控制层级复杂等特点。针对中小功率应用场合,提出整合传统光伏、储能逆变器为一体的两级式光储一体化微电网逆变器,实现了光伏组件与储能设备的协同管理。基于所提架构详细分析了光储一体化系统控制方案,实现了微电网逆变器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。同时针对孤岛模式下负载不平衡等问题,进一步提出了光储一体化微电网逆变器机端电压平衡控制策略。最后,通过搭建的额定功率15 kVA光储一体化原理样机,对所提的一体化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,the traditional optical storage micro-grid has many kinds of inverters and complex control level of the system.Aiming at medium and small power applications,a two-stage integrated optical storage micro-grid inverter integrating traditional photovoltaic and energy storage inverters is proposed which realizes the cooperative management of photovoltaic modules and energy storage equipment.Based on the proposed architecture,the control scheme of the integrated optical storage system is analyzed in detail and the stable operation of the micro-grid inverter 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 islanding mode,the voltage balance control strategy of optical storage integrated micro-grid inverter is further proposed.Finally,the feasibility of the integrated micro-grid inverter topology and the proposed control scheme is experimentally verified by the built integrated optical storage integration principle prototype with rated power of 15 kVA.