基于重复控制的DSTATCOM补偿电流控制  

Compensation Current Control for DSTATCOM Based on Repetitive Control

作　　者：杨昆[1] 陈国柱[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2013年第10期80-85,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51177147);浙江省重点科技创新团队资助项目(2010R50021)~~

摘　　要：针对配电网负载多样、谐波污染严重的情况,为提高配电网静止同步补偿器(DSTATCOM)的无功补偿性能以及低次谐波抑制能力,提出比例积分(PI)与重复控制相结合的电流控制策略,利用PI控制器低频段优越的动态性能和鲁棒性,快速补偿基波无功,并利用重复控制器对周期信号的高跟踪精度,修正PI的谐波跟踪误差。频率特性分析表明,该控制策略可以有效消除传统PI控制在中频段的相位滞后,提高谐波补偿精度。为了提高装置补偿的灵活性和稳定性,通过谐振控制器构造带通滤波器,进行指令选择性提取,针对性补偿危害严重的特征次谐波,并避开系统谐振频率。实验结果验证了所提出控制策略的有效性。It is well known that distribution networks have a variety of loads and are rich in harmonics.A novel compensation current control strategy which combines proportion-integral（PI） controller with repetitive controller is proposed for distribution-network static synchronous compensator（DSTATCOM） to improve the performance of reactive power compensation and the capability of low-order harmonic suppression.The PI controller is responsible for fundamental-frequency reactive power compensation due to its superior dynamic response speed and robustness in the low frequency range.While the repetitive controller is made for correcting the harmonic tracking error of the PI controller due to its high tracking accuracy to periodic signals.Frequency characteristic analysis indicates that the control strategy proposed can effectively eliminate the phase lag caused by the PI controller in the medium frequency range,improving the harmonics suppression performance of DSTATCOM.In order to increase the flexibility and stability of DSTATCOM compensation,a band-pass filter is constructed based on a resonance controller to selectively compensate for serious harmonics and to avoid harmonics with frequencies sensitive to network shock.The experimental results validate the effectiveness of the control strategy proposed.

关 键 词：配电网静止同步补偿器(DSTATCOM) 比例积分(PI)控制 重复控制 无功补偿 谐波抑制 选择性补偿 

分 类 号：TM761[电气工程—电力系统及自动化]