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Based on the above analysis, a control strategy based on cooperative frequency modulation of thermal power units and an energy storage output control system is proposed to improve the frequency stability of the power grid.
The dynamic frequency modulation model of the whole regional power grid is composed of thermal power units, energy storage systems, nonlinear frequency difference signal decomposition, fire-storage cooperative fuzzy control power distribution, energy storage system output control and other components. Fig. 1.
As illustrated in Fig. 7, energy storage can improve the frequency performance of the power grid by responding only to high frequency components of disturbances to reduce the demand for energy storage. The maximum frequency deviation is improved from 0.4348 Hz to 0.3734 Hz, improved by about 14 %.
The energy storage system can improve the frequency response characteristics of the power system, reduce the maximum frequency deviation, and shorten the response time. When energy storage accounts for 1 %, the load and wind power fluctuations are 10 % respectively, the maximum frequency deviation is improved by about 15 %.
The frequency regulation power optimization framework for multiple resources is proposed. The cost, revenue, and performance indicators of hybrid energy storage during the regulation process are analyzed. The comprehensive efficiency evaluation system of energy storage by evaluating and weighing methods is established.
Therefore, in the multi-area interconnected power systems with wind power generation, this paper combines the characteristics of thermal power generator and energy storage system to improve the grid frequency deviation and exchanged power deviation of tie line caused by wind power integration.
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