基于卡尔曼滤波器的逆变器控制研究

A Study of Inverter Control Based on Kalman Filter

传统的基于数字PID(比例-积分-微分)控制的逆变器由于测量噪声、系统噪声和控制误差等导致了系统性能的下降。文中提出一种基于卡尔曼滤波器的电压电流双环PID数字控制方式,有效地抑制了系统中的测量噪声、系统噪声和控制误差,响应速度快,系统稳定性好。实验结果表明:在系统存在均值为0,方差为0.1的高斯白噪声仿真环境下,该基于卡尔曼滤波器的控制器有较高的抗干扰能力,能有效降低逆变器输出波形的总谐波失真。

The inverter with the traditional digital PID control may cause system performance degradation due to the measurement noise, system noise and control error etc. This paper presents a voltage and current double-loop digital PID control algorithm based on Kalman filter which can innovatively filter the noise from measure ment and system process. This method speeds up the system response and improves system stability. In the test condition of the Gaussian white noise with the zero mean and 0.1 variance, the test results show that the Kalman filter-based controller has a high anti-interference ability and can effectively reduce the total har- monic distortion of the inverter output waveform.