并网变流器有限控制集模型预测控制

为了提高带LCL滤波器的并网变流器的控制性能,设计了一种新型的有限控制集模型预测控制(FCSMPC)策略。交直流变流器采用LCL滤波器接入电网时可带来诸多优点,但也存在电网电流谐振,以及控制复杂度增加的问题。新方案通过将主动阻尼算法融合进FCSMPC控制器中可消除电网电流低次谐波,并降低对电网电压失真的敏感度。使用并网变流器实验平台进行新控制策略的稳态和瞬态测试,以及电网电压扰动下的测试。实验结果表明,所开发的新型控制方案能在电网电压失真条件下降低电网电流谐波含量,并具有较好的动态性能和鲁棒性。

Finite Control Set Model Predictive Control for LCL Filter Grid-Connected Converters

In order to improve the control performance of the grid-connected converter with LCL filter, a new finite control set model predictive control (FCSMPC) strategy was designed. AC/DC converters can bring many advantages when using LCL filters to connect to the grid, but there were also problems of grid current resonance and increased control complexity. The new scheme eliminated grid current low-order harmonics and reduces sensitivity to grid voltage distortion by incorporating active damping algorithms into the FCSMPC controller. The steady-state and transient tests of the new control strategy and the test under grid voltage disturbances were carried out using the grid-connected converter experimental platform. The experimental results showed that the new control scheme developed reduces the current harmonic content of the grid under the condition of grid voltage distortion, and has good dynamic performance and robustness.