Hi Mr Mohammad , I share a Conference paper with your subject in the next link

Conference Paper Analysis of proposed controlling topology of the HVDC link b...

Hoping it helps you, kindly regards, Luis Pedro

% MATLAB Simulation for Monopolar Configuration % Define circuit parameters R = 1000; % Resistor value in ohms Vin = 5; % Input voltage in volts C = 1e-6; % Capacitance value in farads % Time vector t = 0:0.001:0.1; % Time from 0 to 0.1 seconds with a time step of 0.001 seconds % Input voltage signal (for example, a step input) Vin_signal = Vin * ones(size(t)); % Initial conditions initial_voltage = 0; % Simulate the circuit using the ode45 solver [t, Vout] = ode45(@(t, Vout) circuit_equation(t, Vout, Vin_signal, R, C), t, initial_voltage); % Plot the results figure; plot(t, Vin_signal, 'r', 'LineWidth', 2); hold on; plot(t, Vout, 'b', 'LineWidth', 2); title('Monopolar Configuration Simulation'); xlabel('Time (s)'); ylabel('Voltage (V)'); legend('Input Voltage', 'Output Voltage'); grid on; % Circuit equation function function dVout_dt = circuit_equation(t, Vout, Vin, R, C) % Circuit equation for a simple RC circuit dVout_dt = (Vin(t) - Vout) / (R * C); end

Monopolar HVDC system simulation:

1. Power System Model:

- AC Grid: Represented by a synchronous generator and connected to a local AC bus.

- DC Link: Modeled as a transmission line with an inductor and a capacitor representing the line impedance and energy storage, respectively.

- Rectifier: Modeled as a controlled current source that converts AC power to DC power.

- Inverter: Modeled as a controlled voltage source that converts DC power back to AC power.

2. Control Structure:

- Rectifier Control: The control strategy in the rectifier is typically based on regulating the DC voltage. It involves a feedback loop that adjusts the rectifier firing angle to maintain a desired DC voltage level.

- Inverter Control: The control strategy in the inverter is usually aimed at regulating the AC voltage and frequency. It involves a feedback loop that adjusts the inverter firing angle and frequency to match the AC grid conditions.

- DC Link Control: The control of the DC link involves regulating the DC current and maintaining the DC voltage within a specified range. This can be achieved using proportional-integral (PI) controllers or more advanced control techniques.

3. Simulation Steps:

- Define the power system model, including the AC grid, DC link, rectifier, and inverter.

- Implement the control structure for the rectifier, inverter, and DC link.

- Specify the initial conditions and parameters for the simulation.

- Run the simulation to observe the dynamic behavior of the Monopolar HVDC system under different operating conditions and disturbances.

To implement this simulation, you can use software tools such as MATLAB/SIMULINK, PSCAD, or other power system simulation software that supports HVDC modeling.

Good luck: partial credit AI