中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2012年
15期
31-39
,共9页
王颖杰%伍小杰%戴鹏%朱荣伍
王穎傑%伍小傑%戴鵬%硃榮伍
왕영걸%오소걸%대붕%주영오
LCL滤波器%虚拟磁链%遗传算法%主动阻尼控制%一阶高通滤波器
LCL濾波器%虛擬磁鏈%遺傳算法%主動阻尼控製%一階高通濾波器
LCL려파기%허의자련%유전산법%주동조니공제%일계고통려파기
LCL filter%virtual flux%genetic algorithm%active damping control%first-order high-pass filter
采用LCL滤波器的脉宽调制整流器一般需要检测电网电压、电流及直流母线电压，为抑制谐振还需检测交流滤波电容支路电压或电流。过多的传感器增加了整流器成本，且检测所得电网电压实际易受电网内感抗干扰，影响整流器稳定运行。首先提出一种基于电网参数辨识的虚拟磁链定向控制方法。在整流器启动之前，采用遗传算法辨识电网感抗、频率、幅值和初始相位角等参数，以获得虚拟磁链及其初值的精确观测。为抑制LCL滤波器谐振，提出一种通过一阶高通滤波器回馈整流器侧电流高频分量的新型有源阻尼控制方法，建立频域模型，分析高通滤波器参数对谐振抑制效果的影响。所提控制策略只需检测直流母线电压及整流器侧两相电流，省去了电网电压传感器及交流滤波电容支路电压或电流传感器。仿真和实验分析证实了该控制策略有效性。
採用LCL濾波器的脈寬調製整流器一般需要檢測電網電壓、電流及直流母線電壓，為抑製諧振還需檢測交流濾波電容支路電壓或電流。過多的傳感器增加瞭整流器成本，且檢測所得電網電壓實際易受電網內感抗榦擾，影響整流器穩定運行。首先提齣一種基于電網參數辨識的虛擬磁鏈定嚮控製方法。在整流器啟動之前，採用遺傳算法辨識電網感抗、頻率、幅值和初始相位角等參數，以穫得虛擬磁鏈及其初值的精確觀測。為抑製LCL濾波器諧振，提齣一種通過一階高通濾波器迴饋整流器側電流高頻分量的新型有源阻尼控製方法，建立頻域模型，分析高通濾波器參數對諧振抑製效果的影響。所提控製策略隻需檢測直流母線電壓及整流器側兩相電流，省去瞭電網電壓傳感器及交流濾波電容支路電壓或電流傳感器。倣真和實驗分析證實瞭該控製策略有效性。
채용LCL려파기적맥관조제정류기일반수요검측전망전압、전류급직류모선전압，위억제해진환수검측교류려파전용지로전압혹전류。과다적전감기증가료정류기성본，차검측소득전망전압실제역수전망내감항간우，영향정류기은정운행。수선제출일충기우전망삼수변식적허의자련정향공제방법。재정류기계동지전，채용유전산법변식전망감항、빈솔、폭치화초시상위각등삼수，이획득허의자련급기초치적정학관측。위억제LCL려파기해진，제출일충통과일계고통려파기회궤정류기측전류고빈분량적신형유원조니공제방법，건립빈역모형，분석고통려파기삼수대해진억제효과적영향。소제공제책략지수검측직류모선전압급정류기측량상전류，성거료전망전압전감기급교류려파전용지로전압혹전류전감기。방진화실험분석증실료해공제책략유효성。
To control pulse width modulation （PWM） rectifier with LCL filter, not only grid voltages, currents and DC bus voltage, but also voltages or currents on capacitor branch should be detected in order to eliminate resonance. So many sensors cause high cost of the rectifier. And because the detected power grid voltage contains influence of the actual impedance of the grid, the stability of the rectifier is affected. In this paper, a control strategy based on parameter identification of power and virtual flux oriented was studied. To achieve accurate virtual flux observation, considering the particular complexity of the LCL filter, before starting the rectifier, Genetic Algorithms was used to identify grid inductance, frequency, amplitude and initial phase ang!e. And for resonance problem of the LCL filter, a new active damping control method was proposed, which gave directly feedbacks of high. frequency component of the current on rectifier side through a first-order high-pass filter. The frequency domain model was set to analyze the high-pass filter parameters on the resonant inhibiting effect. This strategy only detected the DC bus voltage and the rectifier side of the two-phase current, eliminating power grid voltage sensors and voltage or current sensors on capacitive branch. Finally, simulation and experimental results prove the effectiveness of the proposed control strategy.
