Improving Low Voltage Ride-Through Capabilities in Wound Field Synchronous Generator-Based Wind Power Systems using Inertial Kinetic Energy Storage
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Abstract
Increased levels of wind penetration can have a significant impact on the power grid. Voltage dips are probably the most important fault conditions which can affect the quality of the grid voltage. Consequently, wind energy conversion systems (WECS) are required to comply with the grid codes introduced by power system operators. In the presence of voltage dips, the low voltage ride-through (LVRT) requirement produces a mismatch between the generated real power and the real power delivered to the grid. The conventional approach uses a braking chopper (BC) in the DC-link to dissipate any excess of real power. This paper proposes an LVRT strategy for wind turbine based on a wound field synchronous generator (WFSG). During a fault condition, the mechanical system inertia enables the excess of energy to be stored in the turbine generator without any additional circuits. Furthermore, a new control scheme based on an optimized polynomials R, S, T controller using Particle Swarm Optimization (PSO) metaheuristic technique is proposed for enhancing the dynamic response of the WECS. The proposed LVRT strategy is evaluated under various operating conditions and compared with the BC approach and the simulation results demonstrate an improved performance of the WECS and enhanced quality of the grid voltage.
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