孤立微网多元储能与柴油发电机协调控制策略

A Cooperative Control Strategy for Standalone Microgrid Consisting of Multi-storage and Diesel Generators

为实现孤立微网的长期稳定运行,采用超级电容、蓄电池和柴油发电机组成多元互补系统协调分享差额功率。根据机组的不同特性,提出按优先级设计的双层能量管理协调策略,提升多元系统的整体性能;通过爬坡限制控制,设计基于当前超级电容荷电状态与差额功率实时波动程度的功率分配法;规范了蓄电池的出力,减少其承担频繁功率波动,同时可以确保超级电容能量优先级;柴油发电机根据蓄电池荷电状态配合协助蓄电池的运行,保证储能系统能量充足。算例结果表明,所述策略具有较好的优势,分配算法实时快速,便于实现工程应用。

To achieve long-term and stable running of standalone microgrid,a multiple complementary system composed of ultracapacitors,batteries and diesel generators is proposed to coordinate the share of unbalanced power.In order to enhance the overall performance of the multiple system,a double-layer energy management and coordination strategy based on priority and characteristics of different units is proposed.By the power climbing limit control,a coordinative distribution method based on the current state of charge(SOC)of ultracapacitors and real-time volatility is designed.This method is able to standardize the output power of batteries and reduce the frequent fluctuations they understand as well as ensure the energy priority of ultracapacitors.To guarantee sufficient energy of energy storage,the diesel generator is operated to coordinate the running of battery by its SOC.Case studies indicate that the proposed strategy has preferable advantages;meanwhile,it's easy for the real-time and fast distribution algorithm to realize engineering applications.