Abstract
As more and more renewable energy sources (RES) integrated into the conventional distribution system, how to make the current electric grid more reliable and efficient is becoming an important topic the world must face. In order to achieve these goals, grid-connected hybrid energy systems (HES) which contain battery energy storage systems (BESS) and many other advanced technologies have been developed and applied. Many benefits of BESS, such as high density of energy and power, have fast response in energy time-shift, frequency regulation, and so on. This paper focuses on the fluctuation alleviation and power quality improvement of grid-connected HES with high penetration level of RES. A multistage dispatch strategy of BESS for HES is proposed in this paper to mitigate the randomness and intermittence of the power flowed in HES because of high penetration level of RES integration. Four other conventional strategies are also discussed for evaluating the performance of the method proposed in this paper. Detailed cases and corresponding discussions are implemented, and the results show that the method proposed in this paper is more effective and robust than the other conventional strategies.
Highlights
There is an unprecedented growth in power generation, delivery, and usage
One-day case study of each battery energy storage systems (BESS) operation strategy in power fluctuation smoothing is implemented in Section 4.1; a vivid impression will be about the performance of each strategy; Section 4.2 describes the performance of each BESS dispatch strategy of one whole simulation horizon, which is based on the analysis of one-day case, but the conclusions are more convincing and more detailed than Section 4.1; sensitive analysis of each BESS dispatch strategy in situations where BESS parameters are fixed but the forecasts results are imperfect is presented in Section 4.3; Section 4.4 analyzes the performance changes in situations where forecast uncertainty is fixed but the BESS parameters are varying
The former two parts could be considered as special cases of the latter two parts; they analyze the power fluctuation performance of each BESS strategy in hybrid energy systems (HES) with high renewable energy sources (RES) penetration level in perfect forecast conditions; the latter two parts discuss the robust feature of each BESS dispatch strategy in conditions where forecast results are imperfect or BESS parameters are varying
Summary
There is an unprecedented growth in power generation, delivery, and usage. HES integrated with environmental friendly energy sources (wind, solar, and alike) and energy storage system (EES) has drawn more and more attention in mitigating global warming effects, reducing fossil fuel dependence, and reducing economic impact from the rising oil prices [1]. Two main parts are concerned, namely, exploring one scheduling and operation method of BESS to alleviate fluctuations of the power flowed in grid-connected HES with high RES penetration level integration automatically, analyzing the relationships among the system performance and BESS parameters (i.e., power limit, capacity limit), and forecast uncertainty of RES generation and load demand. System description, modeling and constraints of grid-connected HES, indexes used for different strategies evaluation, and detailed mathematical models of strategies referred in this paper are presented to evaluate the performance of them in alleviating fluctuation and improving power quality of high RES penetration level HES.
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