Juan Jose Mesas

Deterministic and Stochastic Study of Wind Farm Harmonic Currents

Wind farm harmonic emissions are a well-known power quality problem, but little data based on actual wind farm measurements are available in literature. In this paper, harmonic emissions of an 18 MW wind farm are investigated using extensive measurements, and the deterministic and stochastic characterization of wind farm harmonic currents is analyzed. Specific issues addressed in the paper include the harmonic variation with the wind farm operating point and the random characteristics of their magnitude and phase angle.

Study of neutral conductor current in three-phase networks with single-phase converters

In this paper, neutral conductor current in three-phase networks with single-phase ac/dc uncontrolled converters is analyzed, and the influence of the unbalances on neutral conductor current is analytically studied. It is shown that supply-voltage unbalance slightly affects the root-mean-square value of the neutral conductor current and load unbalance can increase it. The obtained results are validated with laboratory measurements.

Parameter Estimation Procedure for Models of Single-Phase Uncontrolled Rectifiers

Low-power single-phase loads using single-phase uncontrolled rectifiers with dc-smoothing capacitors as their power supply are increasingly present in low-voltage distribution systems, causing high-voltage distortions. This paper studies the estimation procedure of single-phase rectifier parameters and presents an estimation algorithm based on a rectifier model and actual measurements. The model and the estimation procedure are described and validated with measurements in the laboratory and household installations, respectively.

Deterministic and stochastic study of the three-phase non-linear load behavior

The paper examines the deterministic and stochastic behavior of three-phase uncontrolled rectifiers and three-phase 6-pulse rectifiers from extensive simulations performed by a MATLAB customized program. The study is based on non-linear load invariants and analyzes the harmonic current magnitudes and phase angles of these loads. Invariants are the minimum number of parameters characterizing non-linear loads univocally. Two practical laboratory examples are presented to illustrate the numerical study.

Electrical resonance instability study in wind power plants

Wind power plant stability can be affected by the interaction between the wind turbine and the resonances in the collector grid. This paper presents an electrical resonance instability study applied to wind power plants. The influence of feedforward low pass filter bandwidth and converter filter inductance on wind power plant stability is analyzed with examples. An impedance-based representation of the wind power plant is used to identify the resonances and analyze stability problems. PSCAD/EMTDC time-domain simulations are also shown to validate the stability study.

Electrical resonance instability study in traction systems

Traction system stability can be affected by the interaction between the traction load and resonances in the railway traction grid. This paper presents an electrical resonance instability study applied to traction systems. The influence of traction section length and converter time delay on traction system stability is analyzed with examples. An impedance-based representation of the traction system is used to identify the resonances and analyze stability problems. PSCAD/EMTDC time-domain simulations are also shown to validate the stability study.

Discharge lamp harmonic interaction study by Monte Carlo simulation and experimental measurements

The growing presence of discharge lamps in power distribution systems has increased the harmonic distortion in these systems. The paper studies the magnetic ballast discharge lamp modelization with and without harmonic interaction. The supply harmonic voltage influence on lamp behavior is analyzed by Monte Carlo simulation. The results are validated with experimental measurements.