基于固态变压器逆变级并联的环流抑制控制策略

作为能源路由器的固态变压器是能源互联网中的关键电气设备。为了解决高比例、大功率的含固态变压器的分布式电源并网问题,本文提出了固态变压器输出级逆变器并联的解决方案。而固态变压器输出级并联会产生子系统间的零序环流。针对这个问题,本文将反步控制运用在空间矢量脉宽调制(space vector pulse width modulation,SVPWM)中的控制策略中调整SVPWM零矢量分配,从而达到减小零序环流的目的。仿真结果表明采用的控制策略能够有效减小逆变器并联所产生的子系统间零序环流,从而可以提高固态变压器并网容量。

Control Strategy of Circulating Current Suppression Based on Parallel Inverter Stage of Solid State Transformer

Solid state transformers as energy routers are key electrical devices in the energy internet. In order to solve the problem of grid connected power supply with high proportion and high power, including solid state transformer, this paper proposes a parallel solution for the output stage inverter of the solid state transformer. The parallel output stage of the solid state transformer leads to the zero sequence circulating current between subsystems. To solve this problem, the backstepping control is used in the control strategy of SVPWM to adjust the SVPWM zero vector allocation, so as to reduce the zero sequence circulation current. Simulation results show that the proposed control strategy can effectively reduce the zero sequence circulating current between subsystems in parallel inverters, thus improving the grid connected capacity of the solid state transformer.