多逆变器自适应功率解耦下垂控制策略研究

Research on Multi-Inverter Adaptive Power Decoupling Droop Control Strategy

摘要: 针对多逆变器并联系统中由于线路阻抗不匹配及参数离散性引起的有功与无功功率耦合严重、功率分配不均以及环流问题，提出多逆变器自适应功率解耦下垂控制策略。该方法在传统下垂控制基础上，引入虚拟阻抗重塑输出阻抗特性，并结合自适应功率解耦下垂控制策略，实现功率解耦与高精度均分。通过主从控制架构，各逆变器实时上传功率信息，主控制器计算平均功率并下发，从控制器通过PI调节生成频率与电压修正量叠加于下垂控制输出。该策略兼具分布式控制的稳定性与集中控制的精确性，有效抑制系统环流，提高系统稳定性与动态性能。

Abstract: Aiming at the problems of severe active and reactive power coupling, uneven power distribution and circulating current in multi-inverter parallel systems caused by line impedance mismatch and parameter discreteness, an adaptive power decoupling droop control strategy based on CAN bus is proposed. On the basis of traditional droop control, this method introduces virtual impedance to reshape the output impedance characteristics, and combines with the adaptive power decoupling droop control strategy to realize power decoupling and high-precision power sharing. Through the master-slave control architecture, each inverter uploads power information in real time; the master controller calculates the average power and distributes it to slave controllers, which generate frequency and voltage correction quantities via PI regulation and superimpose them on the output of droop control. This strategy integrates the stability of distributed control and the accuracy of centralized control, effectively suppresses the system circulating current, and improves the system stability and dynamic performance.