基于线性自抗扰的脉宽调制整流器预测直接功率控制

Predictive Direct Power Control of PWM Rectifier Based on Linear Active Disturbance Rejection

传统模型预测直接功率控制响应速度快、抗干扰力强而被广泛应用,但控制目标单一且开关频率较高,使其功率转换率降低.针对该问题,提出一种基于线性自抗扰的三相脉宽调制(PWM)整流器预测直接功率控制.系统内环以功率为控制量,建立功率跟踪偏差的平方和开关频率为损耗函数,并利用滚动优化法选择最优开关状态,省去PWM调制,降低开关频率,另外引入两步预测法与重复控制消除控制延时造成的功率预测误差;电压外环采用线性自抗扰控制器(LADRC)抑制直流侧负载波动的影响.最后,建立基于TMS320F28335控制核心的实验平台,结果表明所提算法的有效性与可行性.

Traditional model predictive direct power control is widely used for its fast response speed and strong anti-interference ability.However,the single control target and high switching frequency reduce the power conversion rate.To solve this problem,a predictive direct power control of three-phase pulse width modulation(PWM)rectifier based on linear active disturbance rejection is proposed.In the inner loop the system power is taken as the control variable,establishes the square of power tracking deviation and the switching frequency as the loss function,and uses the rolling optimization method to select the optimal switching state,eliminating the PWM modulation and reducing the switching frequency.In addition,the two-step prediction method and the repetitive control are introduced to eliminate the power prediction error caused by the control delay;in the outer loop linear active disturbance rejection controller(LADRC)is used to suppress the influence of DC side load fluctuation.Finally,an experimental platform based on the TMS320F28335 control core is established.The results show the effectiveness and feasibility of the proposed algorithm.