2. Charging Station Design
2.2. Control Strategy
- Stage 1: The output current of the stationary charging station increases to the desired value Is*rapidly.
- Stage 2: The output current of the stationary charging station keeps constant at Is∗. The onboard EDLC stacks are charged with constant current Is∗.
- Stage 3: The output current of the stationary charging station decreases to zero rapidly. The charging is complete, and the stationary charging station can be disconnected from the vehicle.
|Algorithm 1 The flow chart of charging control procedure.|
|2:||Measure the output current Ii(k) and output voltage Us(k);|
|3:||if Ii(k) < I∗ then|
|4:||Update the control input τi(k) by|
|% cooperative PI charging control algorithm|
|k = k + 1;|
|goto Step 2;|
|6:||if Us(k) < Us∗ then|
|7:||goto Step 4;|
|9:||Set τi = 0; % the charging is complete;|
- Digital IO: The digital IO is used to transmit commands from the control panel to the control board. The command signals include starting up, shutdown and switching modes.
- Analog IO: The analog IO is used to transmit measurements from sensors to the control board.
- Analog module: The analog module is used to preprocess the measurements from sensors before the measurements are stored and processed in the CPU.
- CPU module: The CPU module consists of two microcontrollers: FPGA XC3S50 and ARMLPC1766. XC3S50 is used to store and process data (including filtering, sequencing, etc.), and LPC1766 is used to run the charging control algorithm and to produce PWM control signals.
- RS485 module: The RS485 module is used to communicate with the personal computer (PC). All transient data in XC3S50 can be transmitted to the PC. Thus, it provides the flexibility of plotting the transient data in drawing software in teh PC.
- Optical interface: The optical interface is used to transmit PWM control signals from the control board to the IGBT driver. The advantage of the optical interface is that it can effectively shield the PWM control signals from electromagnetic interference.
3. Experimental Results
4. Concluding Remarks
Conflicts of Interest
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