Unbalanced Grid Fault Ride-Through Control for Single-Stage Photovoltaic Inverters
Unbalanced Grid Fault Ride-Through Control for Single-Stage Photovoltaic Inverters
复制标题
单级光伏逆变器的不平衡电网故障穿越控制
DOI：
10.1109/tpel.2015.2453275
复制
发表时间：
2016-04
影响因子：
6.7
通讯作者：
F. Neves;M. Carrasco;F. Mancilla–David;G. Azevedo;V. Santos
中科院分区：
文献类型：
--
作者：
F. Neves;M. Carrasco;F. Mancilla–David;G. Azevedo;V. Santos
分布式发电（DG）如光伏发电（PV）的集成对传统的配电系统运行提出了挑战。随着dg装机容量的增长，电网代码正在被修改，以使dg参与提供辅助服务。这包括穿越大型干扰的能力。本文研究了单级光伏系统在电压不平衡条件下的运行行为，提出了一种通过无功功率注入支持电网运行的故障穿越控制方案。此外，可调的电能质量是实现功率纹波和电流谐波之间的权衡。该控制方案利用基于空间矢量傅里叶变换概念的电流控制器。不需要旋转变换，并且在跟踪畸变电流参考时保证了零稳态误差。在详细的PSCAD/EMTDC计算机仿真中对控制器进行了测试，并在实际的并网光伏系统中实现，以验证其在不平衡电压条件下的性能。
Integration of distributed generation (DG) such as photovoltaics (PV) represents a challenge for the traditional operation of distribution power systems. As the installed power of DGs grows, grid codes are being modified to involve DGs in the provision of ancillary services. This includes the ability to ride-through large disturbances. In this paper, the behavior of a single-stage PV system under unbalanced voltage conditions is studied, and a fault ride-through control scheme is proposed which is able to support the grid through the injection of reactive power. Furthermore, adjustable power quality is enabled as a tradeoff between power ripple and current harmonics. The control scheme makes use of a current controller based on the space vector Fourier transform concept. No rotational transformation is required, and zero steady-state error is ensured when tracking distorted current references. The controller was tested in detailed PSCAD/EMTDC computer simulations, and implemented in a real grid-connected PV system to demonstrate its performance under unbalanced voltage conditions.