A coordinated control method of multi-hybrid energy storage in vessel integrated power system
【Abstract】[Objectives] Aiming at the distributed hybrid energy storage system (HESS) in the vessel integrated power system (IPS), a multi-HESS coordinated control method based on the state of charge (SOC) of the energy storage device (ESD) was proposed to achieve the relative consistency among multi-HESS and the reasonable power allocation between supercapacitor and battery within a single HESS. [Methods] The droop control method will be adopted in the outer control loop of a single HESS to realize the initial power allocation, while the master-slave control mode will be adopted in the inner control loop to reduce the communication demand among multi-HESS. Given the characteristics of a fast dynamic response but the small capacity of supercapacitor and large capacity of battery, the SOC value of the supercapacitor is calculated to obtain the output power of the battery within a single HESS. Between multi-HESS, the total charging/discharging power of each HESS is calculated based on the SOC value of the internal battery. [Results] Through the simulation of PSCAD/EMTDC, the discharging response characteristics of multi-HESS under high energy load switching and random fluctuation conditions are verified. Under the charging-discharging mode transformation condition, the bus voltage fluctuation is within the allowable range of 2.5%. The SOC of a supercapacitor is controlled between the upper and lower limits, and the SOC consistency of two supercapacitor units is maintained. In both charging and discharging modes, lithium batteries operate only when the supercapacitor is limited. [Conclusions] On the premise of not depending on the high-low pass filter unit, the multi-HESS coordinated control method has better bus voltage stability and strong robustness.
【Keywords】 integrated power system; multi-hybrid energy storage system; state of charge; power allocation;
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