Presence Of Power Quality Disturbances Research Articles

Detection of Grid Voltage Fundamental and Harmonic Components Using Kalman Filter and Generalized Averaging Method

The proper operation of single-phase and three-phase grid-connected power converters depends on the synchronization with utility networks. The major challenge of the synchronization is how to quickly and precisely extract the ac signal and fundamental positive sequence in single- and three-phase power systems, respectively. This paper proposes a new detection technique based on a modified Kalman filter and the generalized averaging method. The method has an open-loop structure, and uses the orthogonal signals which are obtained directly from the Kalman filter. The resulted detection system is very simple and robust even in the presence of power quality disturbances, such as voltage imbalance, harmonics, and voltage fluctuations. The proposed technique can detect the fundamental and harmonics frequencies within or less than half a cycle in all situations, such as small and considerable frequency variations. Meanwhile, the method guarantees the zero steady-state error in complicated harmonic scenarios, including all typical single-phase and three-phase harmonics. Various case studies are assessed and the performance of the proposed detection method is verified by experiments.

Wavelet-Based Reactive Power and Energy Measurement in the Presence of Power Quality Disturbances

This paper investigates the performance of electronic reactive power/energy meters by evaluating differences that arise as a result of (1) the distinct operating principles of the meter and (2) the presence of stationary and nonstationary power quality disturbances. The paper also includes a comparative study to determine the effectiveness of using orthogonal, bi-orthogonal, or reverse bi-orthogonal wavelets for such application. Moreover, the paper identifies the reactive power quantities required for accurate assessment and monitoring of reactive energy in the presence of power quality disturbances. Finally, the paper provides recommendations on reactive power and energy measurement for future generations of smart meters.

Benefits and impacts of hybrid EV options [Book Review

Power quality laboratory testing usually serves one of three purposes: to test electrical devices for their performance in the presence of power quality disturbances, to test power quality mitigation devices for their ability to mitigate disturbances, or to determine the magnitude and types of power quality disturbances produced by a device connected to the power system. The power quality lab must, therefore, be able to recreate operating conditions, both disturbed and undisturbed, that a device will experience in the field. Several types of equipment are needed to reproduce the various disturbances. Measuring instruments must then capture disturbances and monitor the performance of the device under test. To test large devices, it is sometimes more practical to take the test and monitoring equipment to the device to be tested rather than moving and reconnecting the device in the lab. The IEEE Emerald Book categorizes power quality disturbances. The power quality lab should be able to reproduce and measure these disturbances. For lab testing purposes, it is useful to categorize the disturbances as voltage or current disturbances and as high- or low-frequency disturbances. The category determines what equipment will generate and measure the disturbance in the lab. Low-Frequency Testing A typical system used to generate low frequency disturbances is shown in Figure 1. The disturbance is created at low voltage by an arbitrary waveform generator. The generator may be a commercial device or it may be a PC with waveform generation software driving digital-to-analog converters. Typical outputs are ±10 V.

Power quality laboratory testing

Power quality laboratory testing usually serves one of three purposes: to test electrical devices for their performance in the presence of power quality disturbances; to test power quality mitigation devices for their ability to mitigate disturbances; or to determine the magnitude and types of power quality disturbances produced by a device connected to the power system. The power quality lab must, therefore, be able to recreate operating conditions, both disturbed and undisturbed, that a device will experience in the field.