摘要
采取双同步坐标系解耦锁相的方法,检测出不平衡电网电压中的正序分量和负序分量,并利用坐标变换的数学手段建立包括网侧PWM逆变控制、电压锁相环在内的直驱式风力发电的网侧数学模型,提出电流解耦控制策略,同时结合矢量脉宽调制方法(SVPWM)对交流侧输出电流实施有效控制。使其能独立控制输出电流的有功分量和无功分量,并使输出电流波形为正弦波且与电网电压同频率同相位,从而减少了对电网电压的谐波污染,并消除电压不平衡的影响,实现三相电网电压幅值不平衡时输出电流与电网电压的精确锁相。还利用MATLAB/Simulink软件平台搭建了系统的仿真模型,在电网电压平衡和不平衡时分别进行仿真,仿真结果证明控制系统的可行性与有效性,提高了风力发电并网的可靠性。
By using the decoupled double synchronous coordinate system software phase locked loop （DI）SRF-SPLL）, it can detect the unbalanced grid voltage of positive sequence component and negative sequence component, and put forward the coordinate transforma- tion of the mathematical to establish the grid side of directly-driven permanent wind generator＇s mathematical model, which includes network side PWM inverter control and Voltage phase locked loop. A kind of current decoupling control strategy is proposed. It uses the space vector pulse width modulation （SVPWM） on AC output current control. This method can independently control the output current of the active and reactive component, and can make the output current waveform of sine and grid voltage in phase with the same fre- quency. Thus it can greatly reduce the harmonic pollution. It can eliminate the influence of unbalance voltage, and to achieve a precise phase-locked output current and gird voltage three-phase grid voltage amplitude imbalance. In this paper, using Matlab/Simulink soft- ware platform, the simulation proves the validity and feasibility of the control system when the grid stays in balance and unbalance. This system improves reliability of wind power grid connection.
出处
《控制工程》
CSCD
北大核心
2013年第5期833-836,840,共5页
Control Engineering of China
基金
湖南省自然科学基金项目(09JJ0910)
关键词
风力发电
逆变并网
解耦锁相
电流解耦控制
wind power generation
grid-connected inverter
DDSRF-SPLL
current decoupled controlling
