In order to solve the unbalanced harmonics problem of multi-source and multi-inverter system, a networked hierarchical control approach is proposed, based on the structure of hierarchical control and combined with active parallel filters (APF). In the control approach, the distributed generator (DG) consists of primary and secondary control. In the primary controller and the secondary controller, some basic controls are proposed and modified, which maintain the stable operation of the system. Similarly, a DG compensation and APF-coordinated compensation controller are designed, which coordinate with each other to control the power quality of the system. When the DG compensator cannot fully compensate the sensitive load bus (SLB) by itself, the APF controller can calculate compensation through coordinated control management, then using the APF auxiliary compensator for compensation. Not only does the proposed approach compensate the voltage unbalanced harmonic at SLB, but it also improves the precision of power distribution and load current sharing. Finally, simulation results can validate the effectiveness and feasibility of the proposed approach.

为了解决多源多逆变器系统的谐波不平衡问题，提出了一种基于分层控制结构并结合有源并联滤波器（APF）的网络化分层控制方法。在控制方法中，分布式发电机（DG）由初级和次级控制组成。在主控制器和副控制器中，提出并修改了一些基本控制，以保持系统的稳定运行。同样，设计了DG补偿和APF协调的补偿控制器，它们相互配合以控制系统的电能质量。当DG补偿器本身无法完全补偿敏感负载总线（SLB）时，APF控制器可以通过协调控制管理来计算补偿，然后使用APF辅助补偿器进行补偿。所提出的方法不仅可以补偿SLB处的电压不平衡谐波，而且还可以提高配电和负载电流共享的精度。最后，仿真结果可以验证所提方法的有效性和可行性。