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.
Highlights
The safety and economy of power system are affected directly by transformer running states, which play an important role in network
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
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
Summary
The safety and economy of power system are affected directly by transformer running states, which play an important role in network. A large number of frequency electrical appliances and devices sorted as non-linear loads in industrial and lives have become increasingly universal, which have led to harmonic pollution to system and brought about adverse effects including increased wear and tear, abnormal temperature rise, insulation reduced life expectancy shortened to transformers and other electromagnetic equipments[3]. Non-linear load loss calculation and analysis for transformer has been concerned by the very important. In reference [4], curve fitting method applied, and the harmonics equivalent parameters are calculated with large number of experimental information as to harmonic loss by superposition principle. Equivalent parameter model has been built, and harmonic loss is analyzed in this paper by considering the winding conductor frequency-dependent characteristics with model parameters and the non-linear superposition
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