基于直接功率控制的风力发电系统研究  

Wind Generator System Research Based on Direct Power Control

作　　者：吕俊霞[1] 焦欣欣[1] LüJunxia;JIAO Xinxin(College of Mechanical and Electrical Automation,Henan Polytechnic Institute,Nanyang 473000,Henan,China)

机构地区：[1]河南工业职业技术学院机电自动化学院,河南南阳473000

出　　处：《电气传动》2018年第11期58-62,共5页Electric Drive

摘　　要：风力永磁同步发电(PMSG)系统需要快速的动态响应,提出一种模型预测直接功率控制方法实现逆变侧的并网功能。为了满足低谐波输出性能,需要高采样频率。在电网不平衡条件下,并网电流会发生严重畸变。为了解决上述问题,提出一种改进型的模型预测直接功率控制方法,该方法能够工作在电网平衡和电网不平衡条件。通过采用定义的价值函数,提出的模型预测直接功率控制能够消除有功电流的二倍频分量。该方法不需要复杂的正负序分离算法。和传统方法相比,能够有效降低并网电流THD。仿真验证了提出的算法在电网平衡和电网不平衡条件下均能够输出优质的并网波形质量。Permanent magnet synchronous wind power generator system requires rapid dynamic response.Therefore,a model predictive direct power control method was proposed to realize the interconnection function of inverter side.However,in order to meet the needs of the low harmonic output performance,high sampling frequency was used.Moreover,grid currents were serious distortion under the condition of unbalanced power grid.In order to solve these problems,a modified model predictive direct power control methods was proposed.The methods could work in the power system of power grid balance and imbalance conditions.Through adopting the defined value of the function,the model predictive direct power control could eliminate the active and reactive power of the double frequency component.This methoddidnotneedcomplexofpositiveandnegativesequenceseparationalgorithm.Comparedwithtraditionalmethods,this method could effectively reduce the grid current THD.The algorithm is verified by simulation under the condition of unbalancedpowergridandbalancepowergridthatitcanoutputhighqualitygridwaveform.

关 键 词：模型预测直接功率控制 电网不平衡条件 永磁同步风力发电系统 

分 类 号：TM464[电气工程—电器]