Study on Primary Frequency Regulation of Power Grid Based on Multi-distributed Energy Storage

For the solution of the power system frequency instability problem caused by the integration of new energy generation into the power grid, effective use of energy storage resources for frequency regulation is a key strategy. This paper focuses on how multiple distributed energy storage modules can participate in the primary frequency regulation of the power grid. Firstly, an elliptical variable K control strategy is proposed, which is able to slow down the power output of the energy storage when the SOC of the energy storage approaches a critical level compared with the traditional fixed K method, thus extending the service life of the energy storage system to a certain extent. Secondly, on the basis of the above strategies, this paper introduces a balanced control factor, and then proposes a control strategy for multi-distributed energy storage to participate in the primary frequency regulation of the power grid. This strategy maintains the consistency of the SOC of multiple energy storage modules during frequency regulation. The effectiveness and superiority of the proposed control strategy are verified by step perturbation, continuous perturbation simulation and step experiment under semi-physical platform.