Li-SC HESS power coordination allocation based on PCDH real-time tracking control strategy

The micro-grids usually use energy storage systems to suppress DC bus power fluctuations caused by load changes. The paper uses a hybrid energy storage system (Li-SC HESS) for lithium batteries and super-capacitors to meet both power and energy requirements due to load changes. This paper proposes a PCDH(Port controlled dissipation Hamiltonian） real-time tracking control method based on the low-pass filter time constant modified Li-SC HESS power coordinated distribution for the DC/DC and DC/AC double-stage conversion structure and the passivity of hybrid energy storage system. Combined with the good dynamic characteristics and strong robustness, the method can quickly track and control the DC side voltage, so that it can quickly adapt to the demand of power coordination allocation and maintain the power balance of the system. In this paper, the hybrid energy storage system model of the optical storage micro-grid is established by Matlab/Simulink software, and compared with the conventional voltage and current double closed loop PI control strategy of the micro-grid. Simulation test results show that the proposed PCDH real-time tracking control method has better ability to track load changes and has strong robustness. At the same time, the power coordination allocation method can correct filter time constants in real time participates in the HESS adjustment and effectively reduce the charge and discharge times of lithium batteries, smooth the charging and discharging process, improve the stability of the DC bus voltage, extend its service life, and improve the performance of the hybrid energy storage system are of great significance in the subsequent in-depth study of the power coordination management of the hybrid energy storage system.