平抑光伏系统波动的混合储能控制策略  

A Control Strategy of Hybrid Energy Storage System Capable of Suppressing Output Fluctuation of Photovoltaic Generation System

作　　者：王海波[1] 杨秀[1] 张美霞[1] 

机构地区：[1]上海电力学院电气工程学院,上海市杨浦区200090

出　　处：《电网技术》2013年第9期2452-2458,共7页Power System Technology

基　　金：国家863高技术基金项目(2011AA05A106);国家自然科学基金(50977055);上海市科委重点科技攻关计划(11dz1210405);曙光计划(10SG51)的支持~~

摘　　要：蓄电池/超级电容混合储能系统可以同时发挥蓄电池高能量密度以及超级电容高功率密度的优势,适应用于微网。在Buck/Boost双向功率变换器与直流母线相连的独立光伏微网中,提出一种将储能系统总负荷功率滤波后,采用电流滞环控制蓄电池的充放电、超级电容提供差值功率的新型能量管理方案,以优化对混合储能系统的管理。为平抑光伏出力波动,实现对直流母线电压的控制,针对超级电容的Buck/Boost双向功率变换器,在电压电流双闭环基础上,利用输入电压、负载电流前馈环消除了二者的变化对输出电压的扰动,提高了系统的动态响应速度与控制精度;利用电容电压前馈环消除了由于负载电流大小及方向的改变对系统闭环极点变动的影响,提高了系统的稳定性。仿真结果验证了所提能量管理方案及控制策略的有效性。Hybrid energy storage system （HESS） composed of batteries and super-capacitors can bring the advantages of high energy density of batteries and that of high power density of super-capacitors into full play simultaneously, so HESS is suitable to be applied in microgrid. In the independent photovoltaic （PV） generation microgrid, in which the Buck/Boost bidirectional power converters are connected to DC bus directly, a new energy management scheme, in which after filtering the fluctuating power of the HESS the current hysteresis control is applied to charging/discharging of batteries and the power difference is supplied by super-capacitors, is proposed to optimize the management of HESS. To suppress the output fluctuation of PV generation system and control DC bus voltage, a new control strategy applied to the bidirectional converter of the super capacitor is put forward： based on the voltage and current double closed-loop control the interferences of the fluctuation of input voltage and load current on DC bus voltage are eliminated by input voltage and current feed-forward loops to improve the dynamic response and control precision of the control system, and using capacitor voltage feed-forward loop the influences of variation of the values and directions of load currents on the variation of closed loop poles of control system are eliminated, thus the stability of the control system is improved. The effectiveness of the proposed energy management scheme and control strategy is verified by simulation results.

关 键 词：光伏系统 混合储能系统 超级电容 蓄电池 BUCK Boost双向变换器 能量管理方案 前馈控制 

分 类 号：TM721[电气工程—电力系统及自动化]