一种改进的单相整流器控制策略研究

发布时间：2018-01-10 02:11

本文关键词：一种改进的单相整流器控制策略研究　出处：《电机与控制学报》2017年11期 　论文类型：期刊论文

【摘要】：针对传统的基于低通滤波器的单相锁相环带来的网侧电压幅值衰减和相位滞后问题,提出了一种带通滤波器锁相环控制策略,基于带通滤波器对输入信号幅值无衰减和相位保持的特性,在所设定条件下该方法能够无延迟地提取出网侧电压的基波,并保持基波电压的幅值不变。针对电流环比例谐振控制器因带宽小,在电网频率偏移时带来功率因数下降的问题,采用了一种改进的比例谐振控制器。该控制器增加了带宽,具备零稳态误差和消除电网电压扰动影响的能力,能够减小电网频率偏移对系统的影响。最后,仿真和实验验证了所提出的基于带通滤波器锁相环控制策略和经过改进的比例谐振控制器方法的有效性和正确性。
[Abstract]:Aiming at the problems of voltage attenuation and phase lag caused by single-phase phase-locked loop (PLL) based on low-pass filter, a phase-locked loop (PLL) control strategy for band-pass filter is proposed. Based on the characteristics that the bandpass filter has no attenuation and phase retention to the input signal, the method can extract the fundamental wave of the grid-side voltage without delay under the set conditions. And keep the amplitude of the fundamental voltage unchanged. Because of the small bandwidth of the current loop proportional resonance controller, the power factor decreases when the frequency deviation of the power network. An improved proportional resonance controller is adopted, which increases the bandwidth, has the capability of zero steady-state error and eliminates the influence of voltage disturbance, and can reduce the influence of frequency offset on the system. Simulation and experiments verify the validity and correctness of the proposed phase-locked loop control strategy based on bandpass filter and the improved proportional resonance controller.
【作者单位】：国网电力科学研究院北京科东电力控制系统有限责任公司;国网辽宁省电力有限公司技能培训中心;
【基金】：国家电网公司总部科技项目(JS71-16-006):全球能源互联网实验研究平台
【分类号】：TM461
【正文快照】： 2.国网辽宁省电力有限公司技能培训中心,辽宁锦州12100)0引言目前电网同步方法大致可以归为过零锁相、基于瞬时无功理论的锁相、基于滤波器锁相3类。在单相电网同步方法中,过零检测锁相法在一个工频周期内只能检测到电网电压两个过零点,因而限制了锁相环的锁相速度;而且在电网

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