基于改进下垂控制的并联电流源环流抑制策略

传统的下垂控制为电压型控制，通过下垂方程对电压的幅值和相位进行整定，在电流源并联系统中受到限制，使得电流分配精度不高，且环流抑制效果有限。对此，采用了一种针对电流源并联系统的改进下垂控制策略，结合下垂方程对电流的幅值和相位进行调整，输出参考电流，提高了电流分配精度，可以更好地应用在电流控制系统中。该策略引入了纯感性的虚拟阻抗，在减小功率耦合的同时提高了环流抑制效果，同时针对虚拟阻抗的使用而导致的母线电压跌落，在无功下垂控制回路中使用了电压补偿，减小电压跌落的同时得到了更加精准的输出电流。最后，通过MATLAB/Simulink仿真与搭建实物样机并进行相应实验，验证了理论分析的可行性。

Circulation suppression strategy of parallel current source based on improved droop control

Traditional droop control is voltage-type control, which adjusts the amplitude and phase of voltage by droop equation, and it is limited in parallel current source system, which leads to low current distribution accuracy and limited circulating current suppression effect. In this paper, an improved droop control strategy is proposed for the parallel current source system. The droop equation is used to adjust the amplitude and phase of the current and output the reference current, which improves the accuracy of current distribution. and can be better applied in the current control system. In this strategy, pure perceptual virtual impedance is introduced to reduce the power coupling and improve the circulation suppression effect. Meanwhile, aiming at the bus voltage drop caused by the use of virtual impedance, voltage compensation is used in the reactive droop control loop, which not only reduces the voltage drop, but also obtains more accurate output current. eventually, the correctness of this strategy is proved by the simulation of Matlab/Simulink, the establishment of a prototype and the corresponding experiments.