基于扇合矢量法的基波负序电流检测及其应用
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摘要
在低压配电网中,快速准确地基波负序电流检测对于电能质量控制和继电保护都非常重要,针对传统的基于瞬时无功功率理论的ip-iq和FBD检测方法通过采用锁相环、低通滤波器来实现存在增加算法的复杂度和导致一定的延时等问题。提出了一种新型检测方法。首先通过扇合矢量法,进行矩阵变换,将三相系统的电压和电流归一化为单相系统;然后通过构造改进的正弦幅值积分器,滤除高次正、负、零序电流成分,通过简单的数学运算,实现对基波负序电流的快速提取。该方法具有较强的抗干扰能力和频率自适应性,仿真与实验结果验证了所提方法在有源电力滤波器应用方面具有良好的补偿性能。
In low voltage distribution network,fast and accurate detection of fundamental negative sequence current is very important for power quality control and relay protection,Traditional methods based on the instantaneous reactive power theory and FBD by using phase-locked loop,low-pass filter and the coordinate transformation,which will increase the complexity of the algorithm and delay time accordingly.For this reason,a new detection method is proposed.Using the fan in vector method and matrix transform,three-phase voltage and current of the system will transfer to single-phase system;then constructing sinusoidal amplitude integrator extract positive and negative,zero sequence current.Through simple mathematical operations,the fundamental negative sequence current was obtained quickly.The proposed method has strong anti-interference ability and frequency self adaptation.The simulation and experimental results show that the proposed method has good compensation performance.
In low voltage distribution network,fast and accurate detection of fundamental negative sequence current is very important for power quality control and relay protection,Traditional methods based on the instantaneous reactive power theory and FBD by using phase-locked loop,low-pass filter and the coordinate transformation,which will increase the complexity of the algorithm and delay time accordingly.For this reason,a new detection method is proposed.Using the fan in vector method and matrix transform,three-phase voltage and current of the system will transfer to single-phase system;then constructing sinusoidal amplitude integrator extract positive and negative,zero sequence current.Through simple mathematical operations,the fundamental negative sequence current was obtained quickly.The proposed method has strong anti-interference ability and frequency self adaptation.The simulation and experimental results show that the proposed method has good compensation performance.
引文
[1]常鲜戎,王辉云,张海生.DSTATCOM补偿指令电流的新型检测方法[J].电网技术,2013,(10):2819-2824.
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[13]陈明凯,段小华,李敏,等.扇合矢量法在谐波与无功电流检测中的应用[J].中国电机工程学报,2008,(07):110-115.
[14]王平,李刚健,张海宁,等.改进广义积分器在三相基波正序有功电流检测中的应用[J].电网技术,2016,(10):3199-3205.
[2]朱永强,王腾飞.应用于DSTATCOM的负序电流优先补偿策略[J].电网技术,2012,(08):106-110.
[3]马兴,刘会金,张振环,等.无源性控制策略在谐波/间谐波统一补偿的单相有源电力滤波器中的应用[J].电网技术,2015,(05):1419-1424.
[4]徐榕,于泳,杨荣峰,等.基于单相级联延时信号消除法的三相基波正序有功电流检测方法[J].电网技术,2014,(08):2231-2236.
[5]AKAGI H,KANAZAWA Y,NABAE A.Instantaneous Reactive Power Compensators Comprising Switching Devices without Energy Storage Components[J].IEEE Transactions on Industry Applications,1984,20(3):625-630.
[6]PENG F Z,LAI J S,Generalized instantaneous reactive power theory for three-phase power systems[J].IEEE Transactions on Instrumentation and Measurement,1996,45(1):293-297.
[7]高云鹏,滕召胜,温和,等.凯塞窗插值FFT的电力谐波分析与应用[J].中国电机工程学报,2010,(04):43-48.
[8]林达斌,江亚群,黄纯,等.一种新的谐波、间谐波参数估计算法[J].电网技术,2012,(06):170-174.
[9]MONFARED M,GOLESTAN S,GUERRERO J M.a new synchronous reference frame-based method for single-phase shunt active power filters[J].Journal of Power Electronics,2013,13(4);692-700.
[10]ZANCHETTA P,DEGANO M,LIUJ.iterativelearing control with variable sampling frequency for current control of grid-connected converters in aircraft power system[J].IEEE Transactions on Industry Applications,2013,49(4):1548-1555.
[11]汤胜清,程小华.一种基于多层前向神经网络的谐波检测方法[J].中国电机工程学报,2006,(18):90-94.
[12]XU R,YU Y,FANG Y,Research on a novel detection method for fundamental positive sequence active current[C].IEEE Conference on Industrial Electronics and Applications,2014,1324-1328.
[13]陈明凯,段小华,李敏,等.扇合矢量法在谐波与无功电流检测中的应用[J].中国电机工程学报,2008,(07):110-115.
[14]王平,李刚健,张海宁,等.改进广义积分器在三相基波正序有功电流检测中的应用[J].电网技术,2016,(10):3199-3205.