Class: RPowerFlow::System

Inherits:
Object
  • Object
show all
Defined in:
lib/rpowerflow/system.rb

Overview

TODO: logging!

Instance Method Summary collapse

Constructor Details

#initialize(args = Hash.new) ⇒ System

Returns a new instance of System.



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# File 'lib/rpowerflow/system.rb', line 33

def initialize(args = Hash.new)
  @buses    = Hash.new
  @branches = Hash.new
end

Instance Method Details

#<<(*args) ⇒ Object 



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# File 'lib/rpowerflow/system.rb', line 38

def <<(*args)
  args.flatten.each do |bus|
    @buses[bus] = Array.new
  end

  @bus_array = nil
  @size      = nil
end

#[]=(*args) ⇒ Object 



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# File 'lib/rpowerflow/system.rb', line 47

def []=(*args)
  branch            = args.pop
  @branches[branch] = args.flatten

  @branch_array = nil
  @ybus         = nil
end

#branches(bus = nil) ⇒ Object

TODO: check for required accessors



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# File 'lib/rpowerflow/system.rb', line 69

def branches(bus = nil)
  if bus
    return @buses[bus]
  else
    return @branch_array ||= @branches.keys
  end
end

#buses(branch = nil) ⇒ Object

TODO: check for required accessors



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# File 'lib/rpowerflow/system.rb', line 60

def buses(branch = nil)
  if branch
    return @branches[branch]
  else
    return @bus_array ||= @buses.keys.sort { |a,b| a.id <=> b.id }
  end
end

#jacobian(print = false) ⇒ Object 



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# File 'lib/rpowerflow/system.rb', line 105

def jacobian(print = false)
  if defined?(Linalg)
    jac = Linalg::DMatrix.new(size * 2, size * 2)
  else
    jac = NMatrix.float(size * 2, size * 2)
  end

  (0...size).each do |i|
    source = buses[i]

    (0...size).each do |j|
      target = buses[j]

      if block_given?
        mw   = source.voltage * ybus[i][j].abs * target.voltage * Math.cos(source.angle - target.angle - ybus[i][j].arg)
        mvar = source.voltage * ybus[i][j].abs * target.voltage * Math.sin(source.angle - target.angle - ybus[i][j].arg)

        # Yield the index of the current bus and
        # the incremental Mw and Mvar values.
        yield i, mw, mvar
      end

      if source.slack
        if i == j
          jac[i,i]               = 1e+10
          jac[i + size,i + size] = 1e+10
#               jac[i,i]               = 1.0
#               jac[i + size,i + size] = 1.0
        else
          jac[i,j]               = 0.0
          jac[i,j + size]        = 0.0
          jac[j,i]               = 0.0
          jac[j + size,i]        = 0.0
          jac[i + size,j]        = 0.0
          jac[i + size,j + size] = 0.0
          jac[j,i + size]        = 0.0
          jac[j + size,i + size] = 0.0
        end
      else
        if i == j
          (0...size).each do |k|
            jac[i,i] += ybus[i][k].abs * buses[k].voltage * Math.sin(source.angle - buses[k].angle - ybus[i][k].arg) unless i == k

            if source.avr
              jac[i + size,i + size] = 1e+10
#                   jac[i + size,i + size] = 1.0
            else
              jac[i,i + size]        += ybus[i][k].abs * buses[k].voltage * Math.cos(source.angle - buses[k].angle - ybus[i][k].arg)
              jac[i + size,i]        += ybus[i][k].abs * buses[k].voltage * Math.cos(source.angle - buses[k].angle - ybus[i][k].arg) unless i == k
              jac[i + size,i + size] += ybus[i][k].abs * buses[k].voltage * Math.sin(source.angle - buses[k].angle - ybus[i][k].arg)
            end
          end

          jac[i,i] *= -source.voltage

          unless source.avr
            jac[i,i + size]        +=  source.voltage * ybus[i][i].abs * Math.cos(ybus[i][i].arg)
            jac[i + size,i]        *=  source.voltage
            jac[i + size,i + size] += -source.voltage * ybus[i][i].abs * Math.sin(ybus[i][i].arg)
          end
        else
          unless target.slack
            jac[i,j] = source.voltage * ybus[i][j].abs * target.voltage * Math.sin(source.angle - target.angle - ybus[i][j].arg)

            if source.avr
              jac[i,j + size] = source.voltage * ybus[i][j].abs * Math.cos(source.angle - target.angle - ybus[i][j].arg) unless target.avr
            else
              unless target.avr
                jac[i,j + size]        =  source.voltage * ybus[i][j].abs * Math.cos(source.angle - target.angle - ybus[i][j].arg)
                jac[i + size,j]        = -source.voltage * ybus[i][j].abs * target.voltage * Math.cos(source.angle - target.angle - ybus[i][j].arg)
                jac[i + size,j + size] =  source.voltage * ybus[i][j].abs * Math.sin(source.angle - target.angle - ybus[i][j].arg)
              end
            end
          end
        end
      end
    end
  end

  return jac
end

#print_jacobian ⇒ Object 



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# File 'lib/rpowerflow/system.rb', line 205

def print_jacobian
  jac = jacobian

  (0...size * 2).each do |i|
    format = Array.new
    data   = Array.new

    (0...size * 2).each do |j|
      format << "%.2f"
      data   << jac[i,j]
    end

    puts format.join("\t") % data
    puts
  end
end

#print_ybus ⇒ Object 



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# File 'lib/rpowerflow/system.rb', line 187

def print_ybus
  (0...size).each do |i|
    format = Array.new
    data   = Array.new

    (0...size).each do |j|
      element = ybus[i][j]

      format << "%.1f+%.1fj"
      data   << element.real
      data   << element.imag
    end

    puts format.join("\t") % data
    puts
  end
end

#size ⇒ Object 



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# File 'lib/rpowerflow/system.rb', line 55

def size
  return @size ||= buses.length
end

#ybus ⇒ Object 



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# File 'lib/rpowerflow/system.rb', line 77

def ybus
  return @ybus unless @ybus.nil?

  @ybus = Array.new(size) { Array.new(size, 0.0) }

  # TODO: account for transformers
  branches.each do |branch|
    impedance  = Complex(branch.resistance, branch.reactance)
    charging   = Complex(0, branch.charging)
    mini       = Array.new(2) { Array.new }
    mini[0][0] =  (1 / impedance) + charging
    mini[0][1] = -(1 / impedance)
    mini[1][0] =  mini[0][1]
    mini[1][1] =  mini[0][0]

    endpoints = buses(branch)
    source    = buses.index(endpoints.first)
    target    = buses.index(endpoints.last)

    @ybus[source][source] += mini[0][0]
    @ybus[source][target] += mini[0][1]
    @ybus[target][source] += mini[1][0]
    @ybus[target][target] += mini[1][1]
  end

  return @ybus
end