微电网逆变器的自适应滑模控制策略研究

恒功率负载的输入阻抗具有负增量阻抗特性，其与前级电源的相互作用将对微电网系统的稳定运行产生重大影响.因此，研究带有恒功率负载的微电网稳定性具有实际意义.本文提出了一种改进的滑模控制方法，将其用于改善微电网系统的大信号稳定.首先在系统建模中考虑了系统的参数不确定性及外部干扰，使控制具有较好的鲁棒性；其次在滑模控制中引入自适应算法，对总扰动上界进行了估计，提高了控制的准确性；最后通过Matlab／Simulink建立了微电网模型，通过仿真验证了所提出策略的有效性.

Adaptive sliding mode control strategy for inverter in microgrid

The input impedance of a constant power load usually behaves as negative incremental impedance characteristic, which may have strong impact on the system stability when it is interacting with the front-end converter in a microgrid.In this paper, an improved sliding mode control (SMC) method is proposed to improve the large signal stability of micro grid system.Firstly, the system uncertainties and external disturbances are considered in the system modeling, which make the control have strong robustness.Then, the adaptive algorithm is introduced in the sliding mode control to estimate the upper bound of the total disturbance, which improves the control accuracy.Finally, a simulation model of a microgrid is established in Matlab/Simulink.The effectiveness of the proposed method is verified by simulation results.