CAJ | 학술논문

脉冲宽度调制(pulse width modulation，PWM)整流器的无差拍电流控制能够快速准确地跟踪给定电流信号，但由于电感参数与控制延时的影响，会导致交流电流畸变，电流谐波含量增大甚至系统不稳定。针对该问题，该文提出一种改进无差拍电流预测算法，推导了单相PWM整流器改进算法的离散传递函数，分析电感参数和采样时间对控制系统稳定性能和动态性能的影响。将改进的无差拍电流控制方法应用于双闭环系统中，能够有效减小电网电流的3次谐波及总谐波失真(total harmonic distortion，THD)，消除了电流畸变。
맥충관도조제(pulse width modulation，PWM)정류기적무차박전류공제능구쾌속준학지근종급정전류신호，단유우전감삼수여공제연시적영향，회도치교류전류기변，전류해파함량증대심지계통불은정。침대해문제，해문제출일충개진무차박전류예측산법，추도료단상PWM정류기개진산법적리산전체함수，분석전감삼수화채양시간대공제계통은정성능화동태성능적영향。장개진적무차박전류공제방법응용우쌍폐배계통중，능구유효감소전망전류적3차해파급총해파실진(total harmonic distortion，THD)，소제료전류기변。
Deadbeat current control of pulse width modulation (PWM) rectifiers can quickly and accurately track the given current signal. However, the influence of inductance parameters and control delay can result in AC current distortion, increasing current harmonics and even instability of the system. To solve the above problems, this paper proposed an improved deadbeat current algorithm, deduced the discrete transfer function of a single-phase PWM rectifier, and analyzed the influence of inductance parameter and sample time on control system’s stability and dynamic performance. Put the improved deadbeat current control method in the double-loop system, which can effectively reduce triple-frequency harmonics and total harmonic distortion (THD) of grid current and eliminate the current distortion. The entire system achieves to control the DC bus voltage precisely in outer DC bus voltage control. The simulation and experimental results prove the validity of the theoretical analysis and feasibility of the mentioned current control method.