摘要
该文将单相电压型脉冲宽度调制(pulse width modulation,PWM)整流器作为研究对象,以提升系统动态响应、维持单位功率因数、减小网侧电流谐波含量为研究目标,提出了一种基于最小电流误差的模型预测电流控制。为了在每个控制周期最小化电流误差,该文构建了虚拟d-q同步旋转坐标系,通过求解该坐标系下电流瞬时变化率,预测下一个控制周期的d-q轴电流分量,并结合最小电流误差评价函数求解出系统的最优调制函数。与传统瞬态电流比例积分(proportional integral,PI)控制算法相比,该文提出的方法不但具备了模型预测控制的快速动态响应,而且可实现零稳态电流误差。仿真和实验结果都证明了该方法的正确性和有效性。
This paper presents a model predictive current controller with constant switching frequency for single-phase voltage source pulse width modulation（PWM） rectifiers, which can obtains fast dynamic response, low line current total harmonic distortion（THD） and unity power factor. In order to minimize the line current error during one control period, a virtual synchronous rotating d-q reference frame is constructed, and the instantaneous variation rates of d-axis and q-axis currents are discussed to predict d-axis and q-axis currents at the next sampling interval. Then a modulation function is derived from minimizing the cost function which evaluates the current error. Comparing with the conventional PI-based instantaneous current control（ICC） approach, the proposed method can achieve an inherent rapid dynamic response of model predictive control（MPC） controllers, and obtain zero steady-state errors. Simulation and experimental results have been conducted to demonstrate the effectiveness of the proposed algorithm.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第11期2996-3004,共9页
Proceedings of the CSEE
关键词
单相脉冲宽度调制整流器
直接电流控制
模型预测控制
零稳态误差
实验
single-phase pulse width modulation（PWM） rectifiers
direct current control
model predictive control
zero steady-state error
experiments
