Abstract
The Voltage Source Converter-HVDC (VSC-HVDC) system applied to wind power generation can solve large scale wind farm grid-connection and long distance transmission problems. However, the low voltage ride through (LVRT) of the VSC-HVDC connected wind farm is a key technology issue that must be solved, and it is currently lacking an economic and effective solution. In this paper, a LVRT coordinated control strategy is proposed for the VSC-HVDC-based wind power system. In this strategy, the operation and control of VSC-HVDC and wind farm during the grid fault period is improved. The VSC-HVDC system not only provides reactive power support to the grid, but also effectively maintains the power balance and DC voltage stability by reducing wind-farm power output, without increasing the equipment investment. Correspondingly, to eliminate the influence on permanent magnet synchronous generator (PMSG)-based wind turbine (WT) systems, a hierarchical control strategy is designed. The speed and validity of the proposed LVRT coordinated control strategy and hierarchical control strategy were verified by MATLAB/Simulink simulations.
Highlights
Wind power is one of the fastest-growing new energy forms, and its capacity has continued to grow rapidly in recent years, while the size of the wind farms is growing
For the VSC-HVDC connected wind farm, permanent magnet synchronous generator (PMSG) converters only need to be installed with part power DC choppers, and the heat pressure of the DC unloading resistance is reduced because the reactive power support is executed by the receiving end converter (REC) station and the full grid side converter (GSC) capacity can be used for active output
A new low voltage ride though (LVRT) coordinated control strategy during grid faults has been developed for VSC-HVDC-based PMSG wind power systems, in which VSC-HVDC is controlled in concert with the wind farm
Summary
Wind power is one of the fastest-growing new energy forms, and its capacity has continued to grow rapidly in recent years, while the size of the wind farms is growing. Compared to other wind turbine systems used for commercial power generation, permanent magnet synchronous generator (PMSG) WT systems adopt fully rated converters, and the generator and power grid are decoupled They have little influence on each other and it is easier to realize LVRT during grid faults [6,7]. Since the interaction between the wind farm and the grid in VSC-HVDC-based wind power systems is mainly determined by the VSC-HVDC converters, reactive power support during grid faults is performed by the receiving end converter (REC) station. On the basis of reactive power support for the grid, a fast reduction of the wind farm power output is controlled to eliminate the power imbalance and DC voltage increase in the VSC-HVDC system during grid faults.
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