Abstract
Harnessing wind energy is the most rapidly growing amongst renewable energy sources. However, because of its intermittency in nature, wind power results in unfavorable influences on power system control, operation and stability. The voltage sag and flicker and grid frequency fluctuation are significant in this regard. To minimize the effect of wind power fluctuations and other contingencies on the grid frequency and AC-bus voltage, this paper presents a droop-fed vector control strategy based variable speed pumped storage (VSPS) system comprising the doubly fed induction machine. Modelling of the system is undertaken based on a phasor model technique. The case study is made by considering the droop-controlled VSPS plant in a grid containing conventional synchronous machines for hydropower and thermal power plants and an induction machine wind farm. The performance is validated and analyzed using a MATLAB/Simulink platform. The proposed droop-fed control model is compared with the conventional control strategy (without being droop-fed) and tested to wind power fluctuations, start-up transients, load variations and three-phase fault. The results show that the droop-fed vector control strategy of the VSPS plant achieves better dynamic and steady state controlling responses for grid frequency and AC-bus voltage in the power system than the conventional vector control scheme during wind power fluctuations and contingencies.
Highlights
Due to increasing environmental concerns and energy markets, wind power generation has undergone rapid growth
The results show that the proposed variable speed pumped storage (VSPS) control strategy achieves better performances in the dynamic better performances in the dynamic and steady state responses of the grid frequency and AC voltage and steady state responses of the grid frequency and AC voltage than the conventional strategy
This paper presents a study on droop-fed vector control strategy-based doubly fed induction machine VSPS system for the reduction of wind power fluctuation impact and other contingencies on grid frequency and AC-bus voltage stability
Summary
Due to increasing environmental concerns and energy markets, wind power generation has undergone rapid growth. In 2013, the world wind power production capacity was 318 GW and is forecasted to reach 712 GW, 1480 GW, 2089 GW and 2672 GW by 2020, 2030, 2040, and 2050, respectively, in a moderate scenario. Wind energy production is eco-friendly, sustainable, space efficient, incredible domestic potential, has low operational cost, revitalizing to rural economies, etc. The major drawback of wind power is its intermittency in nature over time, significant wind power fluctuations can be observed. For a power system even with moderate wind power penetration, the fluctuations should be mitigated, otherwise this may lead to substantial deviations in the grid frequency [3], voltage sag and flicker at the grid buses [4], steady state voltage deviation, even equipment damage and system
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