基于全通滤波的单相无功补偿器控制策略研究
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摘要
对于单相静止无功补偿器(SVC),pq变换法被广泛用来检测负载无功电流的大小,而构造与负载电流正交的虚拟电流是其中的关键。为此,提出了基于全通滤波的单相无功补偿器控制策略,采用全通滤波器实现对负载电流移相90°,同时不改变其幅值的大小,从而构造出负载电流的虚拟正交分量。最后,在PLECS下搭建了基于全通滤波的单相无功补偿器仿真模型,仿真结果证明了所提控制策略的有效性和可行性。
For the single-phase static var compensator(SVC),pq transformation is widely used for detecting the magnitude of the reactive current. Constructing the virtual component which is orthogonal to the real load current is the key for pq transformation. Therefore,the all-pass filter based control strategy for single-phase static var compensator was proposed. In the proposed method,the all-pass filter was used to move 90 degree of the phase of the load current without change of the amplitude. Thereby,the virtual component which was orthogonal to the real load current was constructed. Finally,the simulation model of the all-pass filter based single-phase SVC was built in PLECS platform and the experimental results confirm the validity and feasibility of the proposed strategy.
For the single-phase static var compensator(SVC),pq transformation is widely used for detecting the magnitude of the reactive current. Constructing the virtual component which is orthogonal to the real load current is the key for pq transformation. Therefore,the all-pass filter based control strategy for single-phase static var compensator was proposed. In the proposed method,the all-pass filter was used to move 90 degree of the phase of the load current without change of the amplitude. Thereby,the virtual component which was orthogonal to the real load current was constructed. Finally,the simulation model of the all-pass filter based single-phase SVC was built in PLECS platform and the experimental results confirm the validity and feasibility of the proposed strategy.
引文
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[3]周小杰.基于虚拟相电路的单相并网逆变器矢量控制[J].电力电子技术,2015,49(2):52-54.
[4] Chen D,Zhang J,Qian Z. An Improved Repetitive Control Scheme for Grid-connected Inverter with Frequency Adaptive Capability[J]. IEEE Transactions on Industrial Electronics,2013,60(2):814-823.
[5]刘桂花,曹小娇,王卫.弱电网下单相光伏并网逆变器锁频环同步方法[J].中国电机工程学报,2015,35(19):5022-5029.
[6]陈燕东,罗安,谢三均,等.一种无延时的单相光伏并网功率控制方法[J].中国电机工程学报,2012,32(25):118-125.
[7]周啸,金新民,唐芬,等.αβ0坐标系下带不平衡负载的三相四桥臂变流器控制策略[J].中国电机工程学报,2014,34(19):3105-3113.
[8]武健,徐殿国,何娜.基于优化滑动傅里叶分析和广义积分的并联有源滤波器控制策略[J].电网技术,2005,29(17):21-25.