计及系统线路阻抗的电力弹簧电压电流同时补偿控制策略  

Control Strategy of Electric Spring for Simultaneous Voltage and Current Compensation Considering System Line Impedance

作　　者：尹发根 王淳[1] 王巍璋[1] YIN Fagen;WANG Chun;WANG Weizhang(School of Information Engineering,Nanchang University,Nanchang 330031,Jiangxi Province,China;School of Physical Science and Engineering Technology,Yichun University,Yichun 336000,Jiangxi Province,China)

机构地区：[1]南昌大学信息工程学院,江西省南昌市330031 [2]宜春学院物理科学与工程技术学院,江西省宜春市336000

出　　处：《电网技术》2020年第1期282-290,共9页Power System Technology

基　　金：国家自然科学基金资助项目(51467012)~~

摘　　要：针对现有电力弹簧(electric spring,ES)在缓解线路电流不对称、减少中性线电流的控制中存在忽略系统线路阻抗和关键性负载电压无法保持稳定的不足,首先对计及线路阻抗的三相负载不对称系统进行分析,获得中性线电流与ES各相输出电压之间的关系。然后利用果蝇优化算法(fruit fly optimization algorithm,FOA),根据网侧电压计算出使中性线电流幅值最小的ES最优参考输出电压。ES则通过控制器调节其实际输出电压,对关键性负载电压和线路电流同时进行补偿。最后,通过仿真验证了三相电力弹簧在所提策略控制下能够减少线路电流不平衡并保持关键性负载的电压稳定。The existing control methods for mitigating line current asymmetry and reducing neutral current by utilizing electric spring(ES)have the shortcomings that line impedance is ignored and critical load voltage cannot be maintained stable.To solve these problems,this paper firstly analyzes three-phase load asymmetric system considering line impedance,and obtains the relationship between neutral current and ES output voltage.Then,fruit fly optimization algorithm(FOA)is used to calculate the ES optimal reference output voltage,minimizing neutral current amplitude according to grid side voltage.Then the ES simultaneously compensates critical load voltage and line current by adjusting its actual output voltage with the controller.Finally,simulation result verifies that the three-phase ES can reduce line current imbalance and maintain critical load voltage stability with the proposed strategy.

关 键 词：电力弹簧 果蝇优化算法 中性线电流 电压稳定 

分 类 号：TM721[电气工程—电力系统及自动化]