摘要
并联型直流有源电力滤波器可以有效抑制高压直流输电线路谐波,但该滤波器对其控制系统的性能要求也较高。文中采用输电电流高增益反馈控制方法作为控制策略,并依此方法确定了各项设计参数。同时,针对该控制方法的要求基于数字信号处理器(DSP)和现场可编程门阵列(FPGA)设计了一套控制器装置。该装置通过锁相环实现了同步采样和控制。该方法既提高了谐波检测准确度,又能使数字滤波处理的通带频率自动跟踪系统频率变化。该装置实现了一种具有较小相移的脉宽调制模块,保证了谐波抑制性能和滤波系统的稳定。基于该控制系统的样机实验获得了良好的谐波抑制效果。
Although the shunt active DC filter （ADF） can effectively suppress the transmission current harmonics in HVDC, the performance requirements of ADF control system are very high. This paper utilizes a high gain feedback control method in ADF and defines the parameters of the control system. Additionally, a controller based on digital signal processor （DSP） and field programmable gate array （FPGA） is designed for the system. The phase-locked loop （PLL） is ：used in the controller for synchronous sampling and control, which can improve the accuracy of harmonic measurement and makes the passband of discrete digital filter autotrack the system frequency. A pulse width modulation logic circuit with small phase shift is realized to satisfy the performance and stability of ADF system. The lab experiment based on the designed control system obtains good harmonic suppression results.
出处
《电力系统自动化》
EI
CSCD
北大核心
2008年第10期49-52,共4页
Automation of Electric Power Systems
