基于分层控制的微网逆变器与柴发并/离网模式切换策略

摘要

针对独立型微网系统中主控逆变器和柴发并/离网模式切换时存在的切换容易误动作 、暂态冲击大等问题,提出了一种分层控制的思想,其顶层采取能量管理系统调度功率和综合分析模式切换条件,底层双模式逆变器控制采取电流内环的状态跟随算法.该策略将顶层能量管理系统和底层设备控制策略进行有效结合,完成了并/离网的模式切换.随后,以南方某独立型微网系统为研究背景,重点对常见的四种工况进行了讨论分析,并通过实验验证了该控制策略的可行性.%There lie switching malfunction and transient shocks problems during the master inverter and diesel engine grid-connected/island mode switching in the independent micro-network system .In order to solve the above problems ,a hierarchical strategy is proposed .In this strategy ,the power management system is used to schedule each DG power and comprehensively analyze the switching condition during the model switching period in the top layer ,and the synchronous following algorithm is given to output current inner state by PQ model and V /f model in the bottom mode inverter .The top energy management system and the underlying device control strategy is combined to finish the grid-connected/island mode switching .Taking a south island stand-alone micro-grid system as the re-search background ,four common conditions are discussed and analyzed by simulation and experi-ments .The results show the feasibility of the proposed control strategy .