Four mode EMS simulation circuit for presentation

% Create and open a new model
modelName = 'MicrogridModel';
new_system(modelName);
open_system(modelName);

% ----- Add Blocks -----
% 3-phase grid source (440 V line voltage, 50 Hz)
add_block('simscape/Electrical/Sources/Programmable Voltage Source (Three-Phase)', [modelName '/Grid'], ...
    'Position', [100 50 140 100]);
set_param([modelName '/Grid'], 'Frequency', '50', 'ACVoltage', '440');

% PV DC source (placeholder, e.g., 600 V)
add_block('simscape/Electrical/Sources/DC Voltage Source', [modelName '/PV_Source'], ...
    'Position', [100 200 140 250]);
set_param([modelName '/PV_Source'], 'Voltage', '600');

% Battery (Table-Based, e.g., 768 V, 1556 Ah)
add_block('simscape/Electrical/Sources/Battery (Table-Based)', [modelName '/Battery'], ...
    'Position', [100 350 140 400]);
set_param([modelName '/Battery'], 'NominalVoltage', '768', 'Capacity', '1556');

% DC-DC Converter (e.g., regulating 768V to 500V output)
add_block('simscape/Electrical/Semiconductors & Converters/DC-DC Converter', [modelName '/DC_DC'], ...
    'Position', [250 200 300 260]);
set_param([modelName '/DC_DC'], 'NominalVoltage', '768', 'OutputVoltage', '500');

% Inverter (Universal Bridge)
add_block('simscape/Electrical/Sources/Universal Bridge', [modelName '/Inverter'], ...
    'Position', [250 50 300 120]);
set_param([modelName '/Inverter'], 'PowerElectronicDevices', 'IGBT/Diode (4 quadrant)');

% Diesel generator (Synchronous Machine, 440 V)
add_block('simscape/Electrical/Machines/Synchronous Machine', [modelName '/DieselGen'], ...
    'Position', [250 350 300 420]);
set_param([modelName '/DieselGen'], 'NominalVoltage', '440');

% Three-phase load (R=10 Ω, L=0.01 H)
add_block('simscape/Electrical/Elements/Series RLC Branch', [modelName '/Load'], ...
    'Position', [450 200 500 250]);
set_param([modelName '/Load'], 'BranchType', 'RL', 'R', '10', 'L', '0.01');

% ----- Connect Blocks -----
add_line(modelName, 'Grid/1', 'Inverter/1');              % Grid to Inverter input
add_line(modelName, 'PV_Source/+', 'DC_DC/+','autorouting','smart');
add_line(modelName, 'Battery/+',   'DC_DC/-','autorouting','smart');
add_line(modelName, 'DC_DC/1',      'Inverter/3','autorouting','smart');
add_line(modelName, 'DC_DC/2',      'Inverter/4','autorouting','smart');
add_line(modelName, 'Inverter/1',   'Load/1');
add_line(modelName, 'Inverter/2',   'Load/2');
add_line(modelName, 'Inverter/3',   'Load/3');
add_line(modelName, 'DieselGen/1',  'Load/1');
add_line(modelName, 'DieselGen/2',  'Load/2');
add_line(modelName, 'DieselGen/3',  'Load/3');

% Save the constructed model
save_system(modelName);

There is no block named 'simscape/Electrical/Sources/Programmable Voltage Source (Three-Phase)'

>>

Answer 1

[Torsten]

Answer from AI:

Here are the two simplest and most common ways to retrieve the exact library path programmatically or using the GUI.

Method 1: The gcb Trick (Fastest via GUI)

The command gcb stands for "Get Current Block". You can use it to copy the exact path directly from the Simulink Library Browser:

1. Open your Simulink Library Browser.
2. Locate the Programmable Voltage Source (Three-Phase) block.
3. Left-click once on the block inside the Library Browser to highlight it.
4. Go to the MATLAB Command Window and type:

matlab

   gcb

5. MATLAB will output the precise internal path as a string (for example, sps_lib/Electrical Sources/

Programmable Voltage Source (Three-Phase)). Copy this output directly into your add_block command.

Method 2: Programmatic Search with find_system

Depending on your MATLAB version, this Simscape Electrical block is often contained inside the underlying power systems library (historically named sps_lib).

You can force MATLAB to search all block libraries to find the exact match by running this in your Command Window:

matlab

% Load the library into memory first to ensure it can be searched
load_system('sps_lib');
% Search for the exact block name inside the library
paths = find_system('sps_lib', 'Name', 'Programmable Voltage Source (Three-Phase)')

Put It Together: Your Corrected Script

Once you have verified the source path string using one of the methods above, format your code like this to prevent syntax errors:

matlab

% 1. Cleanly define your variables
modelName = 'my_model'; 
blockSource = 'sps_lib/Electrical Sources/Programmable Voltage Source (Three-Phase)'; % Replace with your exact gcb output
blockDest   = [modelName, '/Grid'];

% 2. Add the block safely
add_block(blockSource, blockDest, 'Position', [100 50 140 100]);