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FrequencyEstimator

FixedFrequency

PowerSystems.FixedFrequency — Type
mutable struct FixedFrequency <: FrequencyEstimator
    frequency::Float64
    ext::Dict{String, Any}
    states::Vector{Symbol}
    n_states::Int
end

Parameters of a Fixed Frequency Estimator (i.e. no PLL)

Arguments

  • frequency::Float64: (default: 1.0) Reference Frequency (pu)
  • ext::Dict{String, Any}: (default: Dict{String, Any}()) An extra dictionary for users to add metadata that are not used in simulation, such as latitude and longitude.
  • states::Vector{Symbol}: (Do not modify.) FixedFrequency has no states
  • n_states::Int: (Do not modify.) FixedFrequency has no states
source

KauraPLL

PowerSystems.KauraPLL — Type
mutable struct KauraPLL <: FrequencyEstimator
    ω_lp::Float64
    kp_pll::Float64
    ki_pll::Float64
    ext::Dict{String, Any}
    states::Vector{Symbol}
    n_states::Int
end

Parameters of a Phase-Locked Loop (PLL) based on "Operation of a phase locked loop system under distorted utility conditions" by Vikram Kaura, and Vladimir Blasko

Arguments

  • ω_lp::Float64: PLL low-pass filter frequency (rad/sec), validation range: (0, nothing)
  • kp_pll::Float64: PLL proportional gain, validation range: (0, nothing)
  • ki_pll::Float64: PLL integral gain, validation range: (0, nothing)
  • ext::Dict{String, Any}: (default: Dict{String, Any}()) An extra dictionary for users to add metadata that are not used in simulation, such as latitude and longitude.
  • states::Vector{Symbol}: (Do not modify.) The states of the KauraPLL model are:
vd_pll: d-axis of the measured voltage in the PLL synchronous reference frame (SRF),
vq_pll: q-axis of the measured voltage in the PLL SRF,
ε_pll: Integrator state of the PI controller,
θ_pll: Phase angle displacement in the PLL SRF
  • n_states::Int: (Do not modify.) KauraPLL has 4 states
source

ReducedOrderPLL

PowerSystems.ReducedOrderPLL — Type
mutable struct ReducedOrderPLL <: FrequencyEstimator
    ω_lp::Float64
    kp_pll::Float64
    ki_pll::Float64
    ext::Dict{String, Any}
    states::Vector{Symbol}
    n_states::Int
end

Parameters of a Phase-Locked Loop (PLL) based on "Reduced-order Structure-preserving Model for Parallel-connected Three-phase Grid-tied Inverters."

Arguments

  • ω_lp::Float64: PLL low-pass filter frequency (rad/sec), validation range: (0, nothing)
  • kp_pll::Float64: PLL proportional gain, validation range: (0, nothing)
  • ki_pll::Float64: PLL integral gain, validation range: (0, nothing)
  • ext::Dict{String, Any}: (default: Dict{String, Any}()) An extra dictionary for users to add metadata that are not used in simulation, such as latitude and longitude.
  • states::Vector{Symbol}: (Do not modify.) The states of the ReducedOrderPLL model are:
vq_pll: q-axis of the measured voltage in the PLL synchronous reference frame (SRF),
ε_pll: Integrator state of the PI controller,
θ_pll: Phase angle displacement in the PLL SRF
  • n_states::Int: (Do not modify.) ReducedOrderPLL has 3 states
source