Abstract
With the development and utilization of distributed energy and microgrid, distributed energy storage has become a new development trend. However, small pumped storage units have the advantages of flexible engineering location, low investment, quick effect, low requirements on transmission lines, and a better solution to the peak load demand of the system. Therefore, it is more and more used in the microgrid, and it conducts joint dispatching with wind power, photovoltaic, and other clean energies. To solve the capacity problem of small pumped storage units within the microgrid, a new control strategy is proposed in this paper. Two pumped storage units are used for joint operations. Taking the smoothed combined output power of wind power, photovoltaic power, and pumped storage power as the target, and considering the limitations of transmission lines, the constraints of wind power and photovoltaic power fields as well as the restrictions of pumped storage power units and corresponding reservoirs are taken into account. In this paper, social particle swarm optimization (SPSO) with improved weight is used to calculate and solve the model. The effectiveness of the new control strategy is verified.
Highlights
In order to implement the construction of green and low-carbon ecological civilization, increasing the proportion of investment in renewable energy has been a key factor in the development of energy science
Considering the capacity problem of small pumped storage units within the scope of microgrid [30,31], in order to ensure that large fluctuations of wind power and photovoltaic power can be effectively suppressed within the dispatching cycle, and to avoid the occurrence of large amounts of wind and light abandoning, this paper formulated a new control strategy
Where ut is the number of units in pumping state during t period; kt is the number of generating units in the generating state during t period; nt su is the number of starting units during t period; nt sd is the number of shutdown units during t period; Nt 0 refers to the number of shutdown units during t period within the dispatching cycle; Ng is the total number of units in the pumped storage power station; and Nud is the maximum allowable start and stop times of the total pumped storage unit
Summary
In order to implement the construction of green and low-carbon ecological civilization, increasing the proportion of investment in renewable energy has been a key factor in the development of energy science. Considering the capacity problem of small pumped storage units within the scope of microgrid [30,31], in order to ensure that large fluctuations of wind power and photovoltaic power can be effectively suppressed within the dispatching cycle, and to avoid the occurrence of large amounts of wind and light abandoning, this paper formulated a new control strategy. Considering that there may be power fluctuations that cannot be suppressed due to capacity limitations, the two pumped storage units complete the arrangement of scheduling in advance according to the new control strategy, so as to achieve better stabilization effect for large fluctuations of wind power and photovoltaic power and stability of joint output.
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