Research On Flexible Transmissoin Systems Of Distributed PV

The 21 st century, with the environment and energy issues that affect our lives growing in PV as the main representative of distributed generation technology has been rapid development. However, with a large number of distributed power connected to the grid, large grid had a lot of negative impact, thereby forming on the development of distributed power constraints. Flexible DC transmission(HVDC-Flexible) technology is a new HVDC technology, HVDC this new technology in the system provides active and reactive power, while, on the other hand also increased the system’s transmission capacity and transmission Advantages of stability, etc., can well meet the requirements of distributed power transmission, it is an ideal distributed generation DC power transmission solutions.This paper analyzes the basic principles of photovoltaic power generation, and a brief introduction of photovoltaic power generation operating mode, the system components and working principle; then the AC power cable, traditional high-voltage DC power supply and three based on flexible DC voltage source converter Transmission and network transmission characteristics of a comparative analysis, and flexible HVDC choose as the object of study. General model for photovoltaic simulation analysis, including photovoltaic maximum power tracking electromagnetic modeling and control model. The basic principle of HVDC flexible, practical project on the main circuit power device, inductance and capacitance element parameters and network converter bidirectional power flow control and grid lock control theoretical analysis and calculation. In the Matlab / Simulink environment, design of photovoltaic power generation and network operation control simulation model strategy and network converter for bidirectional power flow control and grid lock control simulation and analysis.Simulation results show that flexible HVDC system studied in this paper has better performance, verified in the photovoltaic power generation and network process using flexible HVDC AC voltage fluctuations can be suppressed and tracking photovoltaic power generation output of active power and improve the photovoltaic power generation and network performance, so as to provide a flexible HVDC simulation in photovoltaic power generation based distributed generation and network transmission applications.