Terminal-voltage and output-power regulation of wind-turbine generator by series and parallel compensation using SMES

Utilisation of renewable energy is becoming increasingly important from the viewpoints of environmental conservation and depletion of fossil fuel. However, the generating power always fluctuates owing to its environmental status. Therefore, an energy-storage system is indispensable to compensate for these fluctuations. Superconducting magnetic energy storage (SMES) is useful for compensation of fluctuating power, since it is capable of controlling both the active and reactive power simultaneously and quickly. Control systems for active and reactive power control of the series and parallel compensation using SMES are proposed. The effectiveness of the proposed system is demonstrated through the instantaneous-value-analysis-based computer simulations in which various cases (system interconnection, wind turbulence, three-phase-to-earth fault in the power system interconnecting large-capacity wind turbine generators) are studied.