电压不对称下角型级联SVG指令提取及电压控制

发布时间：2018-07-01 14:26

本文选题：电网电压不对称 + 角型级联SVG　；参考：《电瓷避雷器》2017年05期

【摘要】：电网电压不对称时,角型级联静止无功发生器(static var generator,SVG)对电网综合补偿存在指令电流提取困难、直流侧电压不平衡等问题。针对该问题,提出一种电压不对称下角型级联SVG相电流指令的合成方法。该方法不仅可以快速合成相电流指令,同时能有效调节直流侧电压。首先,分析了角型级联SVG的拓扑结构,得到补偿器相电流和各电流变量的变换关系。随后,由向量正交条件求得零序电流,并将该零序电流与检测到的线电流指令叠加便可得到综合补偿相电流指令。在MATLAB仿真环境下搭建了级联SVG仿真模型,结果表明,基于此方法的角型级联SVG能很好地实现对电网电压不对称时不平衡负载电流的综合补偿,并能有效平衡级联SVG的直流侧电压。
[Abstract]:When the voltage of the grid is asymmetric, the (static var generator (SVG) of the angular cascade static Var generator has some problems such as the difficulty of extracting the command current and the unbalanced voltage of the DC side for the integrated compensation of the power network. In order to solve this problem, a method of synthesizing phase current instructions of cascaded SVG with voltage asymmetry is proposed. This method not only can synthesize phase current quickly, but also can adjust DC voltage effectively. Firstly, the topological structure of the angular cascade SVG is analyzed, and the transformation relationship between the phase current and the current variables of the compensator is obtained. Then, the zero-sequence current is obtained by orthogonal vector condition, and the zero-sequence current is superposed with the detected linear current to obtain the comprehensive compensation phase current instruction. The simulation model of cascaded SVG is built in MATLAB simulation environment. The results show that the angular cascaded SVG based on this method can achieve the comprehensive compensation of unbalanced load current when the voltage of power network is asymmetrical. The DC side voltage of cascaded SVG can be effectively balanced.
【作者单位】：沈阳农业大学信息与电气工程学院;
【基金】：国家科技支撑计划农村住宅多能互补节能技术节能与示范项目资助(编号:2012BAJ26B00)
【分类号】：TM761.12

【相似文献】