混合储能小比例台架设想

Principle elaboration:
(1) simulated ship electric propulsion system, 48V iron lithium battery and 48V supercapacitor are energy storage devices, and the programmable power supply can simulate diesel generating set. The supercapacitor and the iron lithium battery are connected to the 48V DC bus through a two-way half bridge to form a hybrid energy storage system.
(2) the K1 closure can be powered by the city power via a AC/DC rectifier to the 48V DC bus, and then recharged the iron lithium battery and the supercapacitor through the DC/DC. The K2 closure can be powered by a program-controlled DC power supply, and K1 and K2 can be manually operated without program control. Such as analog pure electric mode power supply, K1, K2 disconnect.
(3) there are four states of control:
A, charging mode
The K1 is closed, and the city power is powered by the rectifier to the 48V DC bus, and then rechargeable to the iron lithium battery and the supercapacitor through 1#DC/DC and 2#DC/DC.
Single power supply mode of B and adjustable programmable power supply
K1 is disconnected, K2 is closed, both 1#DC/DC and 2#DC/DC are not working, and the programmable power supply can be supplied separately. The model is used to simulate the power supply of the diesel generator set.
The total current of the power grid is less than 54A, (about 2.7kW), which can be supplied by a programmable power supply to simulate the separate power supply mode of the diesel generator set. (the adjustable power supply is under 3kW, working in constant pressure mode, when the total load is greater than 3kW, the programmable power supply can work in the constant current mode.)
C, hybrid power supply mode 1, K1 disconnect, K2 disconnect, 1#DC/DC and 2#DC/DC input
Super capacitor, iron lithium battery power supply. Bear motor current and resistance box current.
D, hybrid power supply mode 2, K1 disconnection, K2 closure, 1#DC/DC and 2#DC/DC input
The total current of the power grid is more than or equal to 54A, (about 2.7kW), and the supercapacitor, the iron lithium battery and the programmable power supply are supplied together. Bear motor current and resistance box current.
C and D two models, super capacitor voltage acquisition controller and bus current signal according to the signal of high frequency power load power frequency component detection and the real-time super capacitor charge and discharge current value, realize the control of super capacitor charging and discharging power, high-frequency power supply or absorb part of mutation. The iron lithium battery assumes the low frequency part of the load power. This can greatly reduce the impact of load mutation on the battery, reduce the demand for the power density of the battery, and improve the dynamic response of the system. Meanwhile, the battery can better stabilize the DC bus voltage, and the rate of charge and discharge current change can also be reduced, and the operation condition of the battery can be improved and extended.
Basic measurement requirements
1. Power dynamometer dynamically exerts torque load
2. Able to run and record data for at least 30 minutes
3. Precision requires 10 times per second
4, acquisition parameters include at least the torque, speed, current and power of the motor, branch current and voltage of lithium battery, super capacitor branch current and voltage, programmed DC power branch current and voltage, DC bus voltage.
Also: load torque requires two ways of exerting
1) make use of the editing interface provided by the dynamometer manufacturer to modify the load and torque value of the motor in time.
2), quant Matlab/Simulink model, through the real-time Matlab toolkit, into C code, with the speed of the input signal to the torque as the output signal. According to the speed signal collected, the model is input with the speed as the model, the model output is the torque signal, and the 485 communication is used, and the torque signal is sent to the dynamometer.