TY - JOUR
T1 - Discrete-Time Domain Modelling of Voltage Source Inverters in Standalone Applications
T2 - Enhancement of Regulators Performance by Means of Smith Predictor
AU - Federico, de Bosio
AU - de Sousa Ribeiro, Luiz Antonio
AU - Freijedo Fernandez, Francisco Daniel
AU - Pastorelli, Michele
AU - Guerrero, Josep M.
PY - 2017/10
Y1 - 2017/10
N2 - The decoupling of the capacitor voltage and inductor current has been shown to improve significantly the dynamic performance of voltage source inverters in standalone applications. However, the computation and PWM delays still limit the achievable bandwidth. In this paper a discrete-time domain modelling of the LC plant with consideration of delay and sample-and-hold effects on the state feedback cross-coupling decoupling is derived. From this plant formulation, current controllers with wide bandwidth and good relative stability properties are developed. Two controllers based on lead compensation and Smith predictor design, respectively, are obtained. Subsequently, the voltage regulator is also designed for a wide bandwidth, which permits the inclusion of resonant filters for the steady-state mitigation of odd harmonics at nonlinear unbalance load terminals. Discrete-time domain implementation issues of an anti-wind up scheme are discussed as well, highlighting the limitations of some discretization methods. Extensive experimental results, including a short-circuit test, verify the theoretical analysis.
AB - The decoupling of the capacitor voltage and inductor current has been shown to improve significantly the dynamic performance of voltage source inverters in standalone applications. However, the computation and PWM delays still limit the achievable bandwidth. In this paper a discrete-time domain modelling of the LC plant with consideration of delay and sample-and-hold effects on the state feedback cross-coupling decoupling is derived. From this plant formulation, current controllers with wide bandwidth and good relative stability properties are developed. Two controllers based on lead compensation and Smith predictor design, respectively, are obtained. Subsequently, the voltage regulator is also designed for a wide bandwidth, which permits the inclusion of resonant filters for the steady-state mitigation of odd harmonics at nonlinear unbalance load terminals. Discrete-time domain implementation issues of an anti-wind up scheme are discussed as well, highlighting the limitations of some discretization methods. Extensive experimental results, including a short-circuit test, verify the theoretical analysis.
KW - Current control
KW - Voltage control
KW - Power quality
U2 - 10.1109/TPEL.2016.2632527
DO - 10.1109/TPEL.2016.2632527
M3 - Journal article
SN - 0885-8993
VL - 32
SP - 8100
EP - 8114
JO - I E E E Transactions on Power Electronics
JF - I E E E Transactions on Power Electronics
IS - 10
ER -