# electrical engineering project

I need help with Simscape electrical project in Matlab ( power system )- Electrical EngineeringHello ,I need help with Simscape electrical project. Simscape is a tool in Matlab 2020aPlease see the attached power system in the PDF document.The project is about power protection with relays.The first thing you would need to do is to build the 3 phase circuit shown in the PDF document.Then, you will need to install 4 circuit breakers shown in the PDF document.Then, you will need to install 4 CTs ( current transformers). One CT for each circuit breaker.Then, you would need to make some logic blocks for each breaker such that the breaker will trip and open the circuit if there is a fault current that is higher than the pickup value measured with the CT.This means that you will include a pickup current and time delay for each circuit breaker such that the breaker will trip and open the circuit if the measured current is higher than the pickup for the amount of the delay time.The last thing is to put scopes to see the currents in the circuit.Please let me know if you can help me .Thanks ,

Power Electronics and Drives

Fall 2020

HW #4

Part 1 – Control Design

We would like to connect an EV charger (supplying N EVs) to a PV system and a power grid. PV output is enforced by the nature and the control objective is to capture as much solar energy as possible. Consider MPPT is available and has been designed already. Also, we know that the DC link voltage is higher than that of the EV link. Design the EV charging controllers for the following two purposes:

Scheduled (constant) charging and discharging: The EVs are charged at a constant power rate (Pev). In this case, the power delivered to the grid is equal to PV output minus EV charging power.
Load following: The EV charging is controlled such that the delivered power to the grid remains as constant as possible. This mode is called load following. The power delivered to the grid might deviate from the reference power if the maximum or minimum limits EV charging power (Pevmax or Pevmin) is reached. The EVs are not discharged to the grid.

Part 2 – Simulation

Use the detailed MATLAB example for detailed model of PV arrays connected to grid (power_PVarray_grid_det), where the DC link voltage is 500 V. Irradiance and temperature remains the same as what is applied in the MATLAB example. Connect the buck converter and one battery to resemble all the EVs. EV voltage range is 400V and its size is equal to 25kWh. The maximum charging power of one EV is 6.6 kW and 10 of them are connected to the charger at the time of simulation. Apply the controllers designed in Part 1 and show their performance when:

All EVs are charged at their maximum rate of 6.6 kW i.e. EV charger absorbs 66 kW from the DC link.
EV charging power is adjusted to deliver 30 kW to the grid constantly. There might be some time periods that the 30 KW target is not achievable.

Provide enough explanations and curves to support the performance of your design.

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