【摘要】 以LCL型三相三线制并联型有源电力滤波器为研究对象,分析和建立其在d-q坐标系下的数学模型,根据瞬时无功理论,设计了一套全数字化谐波提取及补偿算法。在推导了并网冲击电流和投入时刻关系的基础上,提出一种直流侧电压分段函数控制和装置最佳点投入电网补偿的柔性并网方案,并为确保算法能够实时运行,开发了一套基于浮点型DSP TMS320F28335和定点型DSP TMS320F2812的双CPU控制系统。经50kVA样机实验结果验证:双CPU控制系统和全数字化补偿算法保障了装置的实时性和补偿效果,柔性并网方案有效地抑制了冲击电流。更多还原

【Abstract】 A mathematic model in d-q frame is established for a shunt active power filter of three phases and three lines with a LCL filter. A purely digital scheme for harmonic currents abstract and its compensation is designed based on the instantaneous reactive power theory. To suppress the impulse current,a method of softly connection to the grid is presented,which is to control DC voltage by piecewise function and to connect to the grid in a proper time. Simultaneously,a dual-DSP control system is developed to compute for control in a real time,which contains a floating DSP TMS320F28335 and a fixed DSP TMS320F2812. The experiment results showed that the dual CPU digital system ensured a real-time control for the harmonic compensation and the soft connection to grid suppressed the impulse current.更多还原