基于事件驱动的逆变器无电压传感器预测控制

Voltage Sensorless Predictive Control of Inverter Based on Event-Trigger

为缓解T型三电平逆变器在应用模型预测控制时的计算负担,提高控制精度,同时降低传感器的使用成本,提出了基于事件驱动的无电压传感器预测控制。建立事件驱动采样机制代替传统的连续时间采样机制,根据相邻采样时刻被控量的状态误差函数设计事件驱动条件,以筛选冗余开关动作、减少预测计算;在此基础上,建立以电网电压为扰动项的改进扩张状态观测器以估计系统扰动误差并结合两步预测实时修正,实现了无电网电压传感器控制,保证了良好的控制精度。同时,分析了控制参数对系统性能的影响并设计控制参数的整定范围。仿真结果表明,改进方法在提高计算效率、降低器件开关频率的同时,能有效改善输出电流波形,提高动态响应速度。

Aiming at T-type three-level inverter grid-connected inverters,a novel voltage sensorless predictive control of T-type three-level inverter based on event-trigger is proposed to overcome the shortcomings of heavy operation burden and hardware cost in MPC.The event-trigger condition is designed to reduce the calculation times.Besides,a voltage sensorless is established through extended state observer to estimate the disturbance of the system.The influence of control parameters on performance is analyzed and the setting range of parameters is given.Finally,experiments show that the improved method can effectively reduce the switching frequency while improve the quality of grid-connected current,which can realize the voltage sensorless and improve dynamic response speed.