The effect of inrush transients on pv inverter's grid impedance measurement based on inter-harmonic injection

This paper addresses a cause for false tripping of photovoltaic inverters with antiislanding protection based on impedance measurement with inter-harmonic injection. Earlier discussions about tripping problems happening when several devices are doing the measurement at the same time are supplemented with a problem caused by inrush transients of nearby devices. A series of experiments was conducted in the Power Quality laboratory of the TU/e, on a PV inverter which complies with the DIN VDE 0126 standard. Impedance measurement was done in parallel with the inverter and measurement results are presented. A criterion for false tripping caused by transients is explored. Also, influences of network impedance and grid harmonic pollution on false tripping were analyzed. In the end, some signal processing techniques are proposed to avoid this problem

Integrated optical beamformers

This paper discusses the challenges towards the realization of the integrated microwave photonic beamformer based on hybrid integration between InP and TriPleX Si3N4/SiO2

Optically switched 56 GBd PAM-4 using a hybrid InP-TriPleX integrated tunable laser based on silicon nitride micro-ring resonators

Tunable lasers are key elements for switching fabrics in future datacenter networks. Experimental results show transmission of 56 GBd PAM-4 data in a switching environment using an integrated silicon nitride micro-ring resonator based tunable laser

Effect of integrated mast on power quality of naval vessel in island configuration

Analysis and measurements have been performed to justify the use of Commercial Off The Shelf products in combination with the power network of a naval vessel. It was concluded that the onboard supply is well controlled and suitable for such applications, except for harmonic distortion, which exceeds the limits in civil and military standards. Measurements were first performed without the integrated mast on the vessel. The integrated mast contains a variety of antennas and control cabinets, which could have an additional effect on the power quality of the island network configuration present inside the vessel. During a second measurement series, power quality measurements with respect to civil and military standards have been performed in order to verify the effect of the integrated mast. It was shown that the naval power network of the vessel including integrated mast, which is normally designed and tested against military standards only, also meets civil standards suitable for the placement of COTS equipment

Analysis of harmonic current interaction in an industrial plant

An analysis of current transients caused by the operation of a nearby device in an industrial plant is presented in the paper. The source of current transients in the factory lighting system was traced to the operation of the nearby six-pulse AC/DC converter. To determine the nature of the interaction, a measurement was done with a storage oscilloscope. Also, laboratory experiments on one lamp were conducted. It was possible to exclude the presence of a parallel resonance on this site. It was concluded that transients are caused by voltage notches in certain working regimes of the six-pulse converter. Possible solutions to the problem are separating the supplies of the converter and the lighting installation, filtering, or adding additional line reactance

Analysis of current transients caused by voltage notches

An analysis of current transients caused by voltage notches in an industrial plant is presented in the paper. The source of current transients in the factory lighting was traced to the operation of the nearby six-pulse AC/DC converter. Because of the short duration of the phenomenon, it was not possible to determine if there is a parallel resonance using a standard power quality analyzer. To determine the nature of the interaction, a measurement was done with a storage oscilloscope, and advanced signal processing was applied to the results. Using this technique, it was possible to exclude the presence of a parallel resonance. It was concluded that the transients are a reaction of lamps to voltage notches in certain working regimes of the six-pulse converter. Possible solutions to the problem are separating the supplies of the converter and the lighting installation, filtering, or adding additional line reactances

Time domain methods for the analysis of conducted interference on the power supply network of complex installations

Conducted spurious phenomena cause interference in the power supply network of complex installations. The time dependent behaviour of these phenomena calls for dedicated measurement techniques in time domain. Quantities to measure are defined for DM as well as CM. Various measurement sensors are designed, implemented, characterised and tested. Frequency domain measurement equipment is not suitable for these time variant disturbances. Signal processing on the time domain data provides the necessary characteristics of the system. The proposed measurement methods provide a basis for the analysis of conducted behaviour of equipment as well as fixed installations

Design and simulation of an integrated optical ring-resonator based frequency discriminator for analog optical links

The performance of a conventional intensity modulation direct detection analog optical links is limited by the high noise power associated with large optical carrier power. This optical carrier can be suppressed by using optical frequency modulation in conjunction with a frequency discriminator. In this paper, we propose a design of an integrated optical frequency discriminator, based on optical ring resonators in order to realize an ideal Class-B optical link.\ud \u

Effect of energy saving lights on power supply

Weak power supply networks are very sensitive to non-linear low power loads. Electronics in low power loads are non-linear, very basic, and consisting of a rectifier bridge and bulk capacitor, consuming current only in the peak of the supplied voltage. Due to the relative high power supply network impedance the waveform of the supplied voltage is heavily distorted. In this paper the effect of energy saving lights on a mobile generator, simulating a weak grid, is studied