Abstract
Low-voltage ride-through (LVRT) is important for the grid integration of wind power systems (WPSs). Each grid operator defines a grid code, including the LVRT requirement, considering their power system characteristics. During grid faults, LVRT is needed for the protection of WPS because the over current can induce damage to the power converter system. An important issue in the LVRT method of WPS is the energy capacity because sufficient reserve energy capacities of wind turbine inertia and an energy storage system (ESS) are needed for a successful LVRT operation. Although ESS can store excess energy of the WPS during a grid fault, it is physically limited considering its energy capacity. Moreover, WPS has a low reserve energy capacity, especially when the WPS operates in high wind speed conditions. Thus, we propose the deloaded operation of WPS for the preparation of LVRT by reducing the power generation of WPS. The effectiveness of the proposed method is validated by modeling a WT and an ESS topologically and performing simulations using the MATLAB/Simulink SimPowerSystems toolbox.
Highlights
As more wind power is installed in power systems, grid integration methods become more important to protect bothThe associate editor coordinating the review of this manuscript and approving it for publication was Yang Li .the power system and wind power system (WPS)
We consider the control of Permanent magnet synchronous generator (PMSG) wind turbines (WTs) for low-voltage ride-through (LVRT) by modulating the amount of power generation which is less than maximum available WP at a given wind speed [3] before a grid fault occurs
WT is controlled for maximum power point tracking (MPPT) during normal state and both WT and energy storage system (ESS) are controlled for the LVRT during grid fault
Summary
As more wind power is installed in power systems, grid integration methods become more important to protect both. We consider the control of PMSG WT for low-voltage ride-through (LVRT) by modulating the amount of power generation which is less than maximum available WP at a given wind speed [3] before a grid fault occurs. We propose a de-loaded operation for the LVRT of WPS during a grid fault. Compared to the previous work [18], the proposed method can effectively solve the problem due to the insufficient reserve energy of WPS and ESS for LVRT. Dynamic model of DC-link voltage is introduced considering generation power and transferred grid power. Pitch angle is used only when reducing the wind power and rotor speed is controlled to modulate the WP to certain amount corresponding generation and grid condition. The difference between mechanical WP and electrical power transferred to the grid by the MSC
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