微源逆变器多模式运行协调控制策略研究

发布时间：2018-02-15 04:03

本文关键词： 微源逆变器多模式运行无缝切换虚拟阻抗下垂控制功率分担　出处：《电机与控制学报》2017年02期 　论文类型：期刊论文

【摘要】：针对微源逆变器运行过程中存在的无缝切换及负荷功率分配问题,提出一种新的协调控制策略。该策略由直接电压内环、虚拟阻抗环和功率外环构成,其中直接电压内环采用自适应三阶滑模控制,将逆变器始终控制为电压源,避免运行模式变化时内环控制策略的切换,同时提高逆变器的动态性能和抗干扰性能;在分析逆变器闭环等效阻抗及其对功率分配影响机理的基础上,针对不同功率等级逆变器设计虚拟阻抗系数,使其输出阻抗呈阻性并满足功率分配的要求;最后利用下垂特性分别设计功率外环,从而实现并网运行时基于下垂控制的间接恒功率控制和离网运行时的无线对等控制。仿真和实验结果验证了控制策略的有效性。
[Abstract]:A new coordinated control strategy is proposed for seamless switching and load power allocation in the operation of micro-source inverter, which consists of direct voltage inner loop, virtual impedance loop and power outer loop. The direct voltage inner loop adopts adaptive third-order sliding mode control, the inverter is always controlled as the voltage source to avoid switching of the internal loop control strategy when the operation mode changes, and at the same time, the dynamic performance and anti-interference performance of the inverter are improved. Based on the analysis of the closed-loop equivalent impedance of the inverter and its influence on power distribution, the virtual impedance coefficient is designed for the inverter of different power levels to make its output impedance resistive and meet the requirements of power distribution. Finally, the power outer loop is designed by using droop characteristics, so that indirect constant power control based on droop control and wireless peer-to-peer control during off-grid operation are realized. Simulation and experimental results show the effectiveness of the control strategy.
【作者单位】：大连海事大学轮机工程学院;
【基金】：国家自然科学基金(51479018,51379002) 中央高校基本科研业务费专项资金资助(3132016335) 辽宁省自然科学基金(2015020139)
【分类号】：TM464

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