Abstract
Self-Excited Induction Generators (SEIGs), e.g., Small-Scale Embedded wind generation, are increasingly used in electricity distribution networks. The operational stability of stand-alone SEIG is constrained by the local load conditions: stability can be achieved by maintaining the load’s active and reactive power at optimal values. Changes in power demand are dependent on customers’ requirements, and any deviation from the pre-calculated optimum setting will affect a machine’s operating voltage and frequency. This paper presents an investigation of the operation of the SEIG in islanding mode of operation under different load conditions, with the aid of batteries as an energy storage source. In this research a current-controlled voltage-source converter is proposed to regulate the power exchange between a direct current (DC) energy storage source and an alternating current (AC) grid, the converter’s controller is driven by any variation between machine capability and load demand. In order to prolong the system stability when the battery reaches its operation constraints, it is recommended that an ancillary generator and a dummy local load be embedded in the system. The results show the robustness and operability of the proposed system in the islanding mode of the SEIG under different load conditions.
Highlights
The UK Government is committed to carbon reduction legislation [1] where the contribution of Fossil Fuels in future energy generation is to be drastically decreased from 53.6% in 2015 to 10.8%
Generators (SEIG) have become key in the Small-Scale Embedded Generation (SSEG) sector because of the drawbacks of other widely used generators such as the Permanent Magnet Synchronous Generator (PMSG) [6], which requires the use of a full scale power converter in order to adjust the voltage and frequency of generation to the voltage and the frequency of transmission, respectively
This work is an improvement of the study in [32], in which an energy storage system is used to reinforce the operation of a Self-Excited InductionGenerators (SEIG) through management of active and reactive power to maintain its optimal load condition operation
Summary
The UK Government is committed to carbon reduction legislation [1] where the contribution of Fossil Fuels in future energy generation is to be drastically decreased from 53.6% in 2015 to 10.8%. Energies 2018, 11, 359 appears to be the right candidate to generate electric power for remote area applications [7,8,9,10,11,12,13,14] It is robust and it can operate in a self-excited mode using only the input mechanical power from the rotating wind turbine. It is simple in construction, small in size and weight, reliable, efficient, and with reduced cost of maintenance. This work is an improvement of the study in [32], in which an energy storage system is used to reinforce the operation of a SEIG through management of active and reactive power to maintain its optimal load condition operation. This work provides an important contribution to the operation of distribution networks under increasing penetration of Small-Scale Wind Generation and ensuring compliance with the G59 regulations, as stipulated by the UK grid code [36]
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