MODELLING AND CONTROL OF WEAK POWER SYSTEMS SUPPLIED FROM DIESEL AND WIND

摘要

The control of voltage and frequency in stand-alone systems incorporating wind turbines is a challenging task. Fast automated control actions are required to tackle this problem. With recent developments in power electronics and computer, superconducting magnetic energy storage (SMES) and battery energy storage systems (BESS) have emerged as fast-acting control devices for power system applications. This article proposes insertion of small SMES/BESS devices in a wind diesel power system. The effective location of the storage devices is chosen and suitable control schemes are proposed, which force SMES/BESS to operate in all four quadrants of P-Q plane (charging, discharging, leading vars, and lagging vars), in order to reduce the fluctuations in system frequency and voltages. A complete model of the hybrid wind-diesel-energy storage system is developed for simulation purposes. A comparative study of the system performance with the proposed schemes is then carried out.