TITLE:
Research on Control Method of Inverters for Large-scale Grid Connected Photovoltaic Power System
AUTHORS:
Zhuo Zhang, Hongwei Li
KEYWORDS:
Large-scale Photovoltaic Grid-connected; Dynamic Feedback Linearization; Nonlinear Decoupling; Cascade Connection PI Control
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
January
3,
2014
ABSTRACT: A grid-connected inverter
controlling method to analyze dynamic process of large-scale and grid-connected
photovoltaic power station is proposed. The reference values of control
variables are composed of maximum power which is the output of the photovoltaic
array of the photovoltaic power plant, and power factor specified by
dispatching, the control strategy of dynamic feedback linearization is adopted.
Nonlinear decoupling controller is designed for realizing decoupling control of
active and reactive power. The cascade PI regulation is proposed to avoid
inaccurate parameter estimation which generates the system static error.
Simulation is carried out based on the simplified power system with large-scale
photovoltaic plant modelling, and the power factor, solar radiation strength,
and bus fault are considered for the further research. It’s demonstrated that
the parameter adjustment of PI controller is simple and convenient, dynamic
response of system is transient, and the stability of the inverter control is
verified.