MATLAB SIMULINK WORKSHOP

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MATLAB SIMULINK WORKSHOP

• Building Basic Power System Using SimPowerSystems

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What is power system?

• An electrical network.
• It comprises of
• Generators
• Load
• Transmission lines
• Support devices, e.g. transformers and protection
  devices.

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Assessing the network

• It is imperative to continuously assess the power
  network for any inconsistencies.
• Type of possible assessment done
• Load dispatch generator scheduling
• Contingency analysis
• Stability Studies
• Stability studies for network expansion and
  improvements.

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Methods of assessment

• The standard approach done by utilities all over
  the world is by using a form of static load flow
  or power flow iteration.
• Reason
• Simple
• Fast
• Accurate for the constraint given to the system

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Methods of assessment

• Disadvantages
• Inaccurate for dynamic scenarios

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Static Load Flow

• Objective
• To compute the P and Q flow in the branches of a
  system (these values may be an indicator of line
  loading due to load or generator constraints)
• To compute the resultant bus voltage levels
• To compute generation levels due to load or
  generator constraints.

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Overview of Static Load Flow

• Using a mathematical model for the system,
  compute the P and Q flow in each branch.
• Well established methods
• Newton Raphson Iteration
• Gauss-Sidel Iteration
• Fast DeCoupled Newton Raphson Iteration

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Using SimPowerSystems

• The new name for the power system block set
  available in Matlab Simulink
• The power system block set contains basic
  components which can also be customizable to
  suite application requirements.

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Calling Power System blockset

• Type powerlib at the MATLab prompt
• At the powerlib window, select file-new-model, to
  setup a new circuit.
• Using the powerlib library window, a simple
  circuit construction can be made.

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Example circuit
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Completed Circuit
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Running basic calculations

• Click on the run button
• Clicking onto the scope may show the waveforms
  going in and coming out of the transmission line.
  
• For practical example, please load file name
  psbmachines.mdl located in the matlab folder.

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Advantages of SimPowerSystems

• Advantageous for fast system prototyping, hence
  suitable for quick exploratory research related
  to power system components

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Disadvantage of SimPowerSystems

• As the system size increases, building the power
  system may be complicated hence may require
  computing overhead to compute basic power system
  iterations.
• Hence a program based 3rd party package is
  recommended, e.g. MatPower

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Thank You