摘要
为了抑制单相电压型整流器电网侧电流的谐波,采用数字陷波器有效地滤除直流侧固有的二次谐波,降低了直流电压谐波对电网电流的影响。电流环的控制采用比例谐振调节器(proportion resonant controller)即PR调节器取代了传统的调节器。PR调节器能够消除交流系统的稳态误差,抑制低次谐波和开关频率附近的高次谐波。使用单相空间矢量脉宽调制(space vector pulse-width modulation,SVPWM)技术,有效地抑制谐波,易于数字化。改进的单相锁相环能够在电网频率±1%的波动范围内,准确锁定相位信息。实现网侧单位功率因数,改善网侧电流的波形。用MATLAB仿真分析并搭建2kW单相PWM整流器样机验证了该法的正确性和可行性。
To eliminate the harmonic in the single phase voltage-source rectifier grid side current, the digital notch filter is used to filter out the inherent second harmonic in the DC side so as to reduce the influence of DC voltage har monies on the grid currents. Current loop is controlled by the proportion resonant（PR） controller to replace the traditional controller. The PR controller can eliminate the steady-state error of the alternating system, suppress the low order harmonics and the high harmonics in the vicinity of switching frequency. The use of single-phase space vector pulse width modulation （SVPWM） technique can improve the utilization ratio of de-link voltage and is esay to be digitalized. The improved single-phase phase-locked-loop （PLL） can accurately lock phase information when the frequency fluctuation is in the range of ＋ 1%. The proposed method realizes the unity power factor of the power side, improves the current waveform of the grid side. Simulation analysis based on MATLAB and construction of single-phase PWM rectifier 2 kW prototype verifies the correctness and feasibility of the method.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第8期2095-2100,共6页
High Voltage Engineering
基金
中国矿业大学青年科研基金(2007A016)~~
