在研究阻性有源滤波器(resistive active power filter,R-APF)背景谐波抑制时,发现实际谐波抑制效果弱于理论分析,其原因在于传统R-APF谐波抑制方案,没有考虑R-APF等效输出阻抗对抑制系统背景谐波的影响。为此,提出两种谐波抑制优化方案...在研究阻性有源滤波器(resistive active power filter,R-APF)背景谐波抑制时,发现实际谐波抑制效果弱于理论分析,其原因在于传统R-APF谐波抑制方案,没有考虑R-APF等效输出阻抗对抑制系统背景谐波的影响。为此,提出两种谐波抑制优化方案:考虑R-APF等效输出阻抗的影响,重新整定R-APF的虚拟导纳;选择多重比例谐振控制器增强特定谐波频率处R-APF等效输出阻抗,减弱其对谐波抑制效果的影响。通过仿真和实验验证,所提方案都能更有效的抑制系统背景谐波。展开更多
随着高科技园区等用户对供电可靠性要求的提高,环形配电网成为一种发展趋势。与射线型配电网相似,由功率因数校正电容和系统自身电感导致的谐波谐振现象,使得环形配电网中的谐波污染问题成为人们关注的焦点之一。该文针对环形配电网中...随着高科技园区等用户对供电可靠性要求的提高,环形配电网成为一种发展趋势。与射线型配电网相似,由功率因数校正电容和系统自身电感导致的谐波谐振现象,使得环形配电网中的谐波污染问题成为人们关注的焦点之一。该文针对环形配电网中谐波谐振现象,基于将环形配电网等效为射线型配电网的基本思想,提出一种在环形配电网中点安装等效无限长有源电力滤波器(infinite active power filter,I-APF)的谐波抑制方案。相比于在环形配电网中点安装阻性有源电力滤波器(resistive active power filter,R-APF)的传统方案,该方案不仅能够获得更好的谐波抑制效果;同时,该方案对于安装位置的改变、电容的改变和非线性负载的改变,均具有更好的适应性和谐波抑制效果。仿真分析和实验结果均验证了该方案的正确性和有效性。展开更多
对于环型配电网,具有较高的供电可靠性,已然成为一种发展趋势,其线路电感与功率因数校正电容之间的谐振使得系统背景谐波电压谐振放大,导致电力系统中的谐波电压严重畸变。针对环形配电网中谐波谐振现象,提出一种基于双点检测单阻性有...对于环型配电网,具有较高的供电可靠性,已然成为一种发展趋势,其线路电感与功率因数校正电容之间的谐振使得系统背景谐波电压谐振放大,导致电力系统中的谐波电压严重畸变。针对环形配电网中谐波谐振现象,提出一种基于双点检测单阻性有源滤波器(double point detection of single resistive active power filter,DPDSRAPF)的谐波衰减策略,即检测环形配电网中2个节点(其中一个节点为中点,另一节点为中点以外的节点)的谐波电压,而APF和非线性负载改变等工况下,具有更好的鲁棒性和谐波衰减效果。仿真分析和实验结果均验证该方案的正确性和有效性。展开更多
A novel simplified method is presented to design FIR filter with controllable center frequency. The properties of transfer curves for all-phase filters are illustrated under 3 windowing conditions. By combining single...A novel simplified method is presented to design FIR filter with controllable center frequency. The properties of transfer curves for all-phase filters are illustrated under 3 windowing conditions. By combining single-window all-phase filter design steps and double phase-shift combination, a series of design formulas for point-pass filter, notch filter, band-pass filter and band-stop filter are derived, thus the design computation complexity is greatly reduced. Experiments prove that the center frequency of all the filters can be accurately specified at arbitrary position by adjusting frequency parameters m and λ.展开更多
文摘在研究阻性有源滤波器(resistive active power filter,R-APF)背景谐波抑制时,发现实际谐波抑制效果弱于理论分析,其原因在于传统R-APF谐波抑制方案,没有考虑R-APF等效输出阻抗对抑制系统背景谐波的影响。为此,提出两种谐波抑制优化方案:考虑R-APF等效输出阻抗的影响,重新整定R-APF的虚拟导纳;选择多重比例谐振控制器增强特定谐波频率处R-APF等效输出阻抗,减弱其对谐波抑制效果的影响。通过仿真和实验验证,所提方案都能更有效的抑制系统背景谐波。
文摘随着高科技园区等用户对供电可靠性要求的提高,环形配电网成为一种发展趋势。与射线型配电网相似,由功率因数校正电容和系统自身电感导致的谐波谐振现象,使得环形配电网中的谐波污染问题成为人们关注的焦点之一。该文针对环形配电网中谐波谐振现象,基于将环形配电网等效为射线型配电网的基本思想,提出一种在环形配电网中点安装等效无限长有源电力滤波器(infinite active power filter,I-APF)的谐波抑制方案。相比于在环形配电网中点安装阻性有源电力滤波器(resistive active power filter,R-APF)的传统方案,该方案不仅能够获得更好的谐波抑制效果;同时,该方案对于安装位置的改变、电容的改变和非线性负载的改变,均具有更好的适应性和谐波抑制效果。仿真分析和实验结果均验证了该方案的正确性和有效性。
文摘对于环型配电网,具有较高的供电可靠性,已然成为一种发展趋势,其线路电感与功率因数校正电容之间的谐振使得系统背景谐波电压谐振放大,导致电力系统中的谐波电压严重畸变。针对环形配电网中谐波谐振现象,提出一种基于双点检测单阻性有源滤波器(double point detection of single resistive active power filter,DPDSRAPF)的谐波衰减策略,即检测环形配电网中2个节点(其中一个节点为中点,另一节点为中点以外的节点)的谐波电压,而APF和非线性负载改变等工况下,具有更好的鲁棒性和谐波衰减效果。仿真分析和实验结果均验证该方案的正确性和有效性。
基金Supported by National Natural Science Foundation of China (No. 60802048)New Teacher PhD Programs Foundation of Ministry of Education of China (No. 200700056105)
文摘A novel simplified method is presented to design FIR filter with controllable center frequency. The properties of transfer curves for all-phase filters are illustrated under 3 windowing conditions. By combining single-window all-phase filter design steps and double phase-shift combination, a series of design formulas for point-pass filter, notch filter, band-pass filter and band-stop filter are derived, thus the design computation complexity is greatly reduced. Experiments prove that the center frequency of all the filters can be accurately specified at arbitrary position by adjusting frequency parameters m and λ.
