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图2 LCL滤波器传递函数框图 由以上分析,经LCL滤波器的电压由于滤波 Fig.2Blockdiagram ofLCLfiltertransferfunction 电容对交流无阻尼的特性 .可认为是一个含有谐 由图可见.在 LCL滤波器的不同节点处电流 波的电源,即有类似 L型滤波器的解耦,得到: 采样作为控制变量 ,将会导致传递函数的不同。由 叻=G。(s)...
lossofpassivedampingmethodcausesseriousproblemoffever.Anactivedampingcon—trolstrategyofcapacitorcurrentfeedbackanddesignmethodwasproposedbasedonthetransferfunctionofLCLfilterandtheimpactofcapacitorcurrentonthedampingofthesystem.Theimpactofthepro—posedactivedampingstrategyonsystemresonancepeakgainandswitching~equencygain...
applying the filter-capacitor current feedback in the current loop is proposed to achieve the function of damping resistor. Then, the input impedance integrated the controller with the LCL-filter parameters in high frequency region is modeled and analyzed by the frequency responses of the transfer ...
1 Grid-connected inverter with a LCL filter逆变器输出电压可以等效为基波电压和开关频率次谐波电压之和,二者均是正弦波形式,从而连接逆变器和电网的LCL滤波器就可以等效为如图2(a)所示的基本等效模型。图2中,U1和Uh分别为逆变器输出电压的基波成分和谐波成分;Ug为电网电压;ic为滤波器逆变器侧电流;ig为滤波器...
围l 带“一L滤波的三相电压型PWM并网变换器 inverter Fig.1Three-phasevoltagePWM鲥d with舰-filter 为研究方便,取LCL滤波器的单相等效电路 进行研究。由于电压型并网变换器在网侧相当于一 图3 三相电压型PWM并网变换器的矢量控制框图 个电压源,于是便得到如图2所示的LCL滤波器的 Vectorcontrolblock of Fig.3 ...
The Bode diagrams of the open-loop transfer function are shown in Fig. 5, where the preferred region of the kp range is between 1000 and 4000. It is evident that the resonance characteristic of the LCL filter is not revealed in the open-loop transfer function. The explanation is that the...
an active damping method of converter based on single current feedback is proposed on the basis of careful analysis of system transfer function and resonance mechanism. In this method, the transfer function equivalent principle is applied, an...
以风力发电为例,最外环提供注入功率(并网运行方 式)或额定电压(孤岛运行方式) ;中间环负责保持逆 KEY WORDS: grid-connected inverter; LCL output filter; PI controller 变器直流侧电压在各种负载条 下恒定;最里面的 电流环实现逆变器交流侧电流快速、精准地跟踪最 摘要:针对含有LCL 输出滤波器这类大惯性环节...
三相并网逆变器LCL滤波器的研究及新型有源阻尼控制_陈新