微网蓄电池储能系统滤波及并网控制策略  

BESS filtering and grid-connection control of microgrid

作　　者：曾祥军[1] 李凤婷[1] 路亮[2] 王一波[3] 

机构地区：[1]新疆大学可再生能源发电与并网技术教育部工程研究中心,新疆乌鲁木齐830047 [2]甘肃省电力公司风电技术中心,甘肃兰州730050 [3]中国科学院电工研究所中国科学院太阳能热利用技术及光伏系统实验室,北京100190

出　　处：《电力自动化设备》2017年第4期45-51,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51267019)~~

摘　　要：针对微网中蓄电池储能系统充放电时谐波含量较高情况,在DC/DC与DC/AC变流器之间加入LC滤波器滤除低次谐波,在DC/AC变流器与电网之间加入LCL滤波器抑制高次谐波;并在传统PQ控制基础上以逆变器侧电感电流和网侧电感电流加权值作为内环电流控制信号,降低了解耦分量的纹波含量,减小了储能系统的电压源特性和LCL滤波器阻抗特性对滤波效果和电压波形的影响,提高了控制精度和响应速度;通过隔离变压器调节逆变器输出电压,保证并网电压的稳定。构建仿真模型仿真验证了双层滤波结构和改进控制策略可有效提高蓄电池储能系统的电能质量。Aiming at the high harmonic contents due to the charging and discharging of BESS（Battery Energy Storage System） in microgrid,a dual-filter structure is proposed,which applies an LC filter between DC/DC converter and DC/AC converter to filter out the low-order harmonics and an LCL filter between DC/AC converter and grid to restrain the high-order harmonics. Based on the conventional PQ control,the weighted inverter-side and network-side inductive currents are used as the signals of inner-loop current control to lower the ripples of decoupled components,reduce the influence of the voltage-source characteristics of BESS and the impedance characteristics of LCL filter on the filtering effect and voltage waveform,and improve the control accuracy and response speed. An isolation transformer is used to adjust the output voltage of inverter for stabilizing the grid-connection voltage. A simulation model is built and the simulation results show that the power quality of BESS is effectively improved by the proposed dual-filter structure and control strategy.

关 键 词：微网 蓄电池 储能 滤波器 PQ控制 电能质量 

分 类 号：TM912[电气工程—电力电子与电力传动] TM46