摘要
随着光伏发电的占比迅速增大,光伏并网逆变器的控制器需要从锁相环中获取公共耦合电压点的幅值和相位,当其处于弱电网或电网电压传感器出现故障时,会造成锁相环不稳定,大大增加了逆变器的控制难度。提出一种基于内模原理的光伏逆变器电网电压估计与控制方法,该方法利用电流测量和滤波器参数的标称值,实现了公共耦合电压估计和单位矢量生成。在小型实验室样机上进行了实验,结果表明:与采用电压和电流传感器的传统电流控制相比,所提控制方案在理想和非理想电网电压条件下都能提供更好的瞬态响应能力,从而验证了所提方法的有效性。
As the proportion of photovoltaic power generation increases rapidly,the controller of photovoltaic grid-connected inverter needs to obtain the amplitude and phase of the common coupling voltage point from the PLL.When it is in the weak power grid or the power grid voltage sensor fails,the PLL will be unstable,which greatly increases the control difficulty of the inverter.Based on this,this paper proposes a method of grid voltage estimation and control of photovoltaic inverter based on internal mode principle,which realizes common coupling voltage estimation and unit vector generation by using current measurement and nominal values of filter parameters.The robustness analysis shows that the proposed control and estimation methods are almost insensitive to parameter changes.Compared with traditional current control using voltage and current sensors,the proposed control scheme can provide better transient response capability under both ideal and non-ideal grid voltage conditions.Finally,experiments on a small laboratory prototype demonstrate the effectiveness of the proposed method.
作者
贺晓红
白雪松
袁绍军
刘健
王宏亮
向峰
杨东
HE Xiaohong;BAI Xuesong;YUAN Shaojun;LIU Jian;WANG Hongliang;XIANG Feng;YANG Dong(Chengde Power Supply Company,State Grid Jibei Electric Power Co.,Ltd.,Chengde 067000,Hebei,China;Nanyang Power Supply Company,State Grid Henan Electric Power Company,Nanyang 473000,Henan,China;School of Electrical Engineering,Northeast Dianli University,Changchun 132012,Jilin,China)
出处
《电网与清洁能源》
北大核心
2022年第3期119-128,共10页
Power System and Clean Energy
基金
国家自然科学基金项目(51777027)
国网冀北电力有限公司科技项目(SGJB0000TKJ1900092)。
