Harmonic Injections Sample Clauses

Harmonic Injections. Harmonics are currents or voltages with frequencies that are integer multiples of the fundamental power frequency. The standard frequency is 50 or 60 Hz depending on the country (50 Hz in the UK and Europe. Therefore harmonics in a 50 Hz country could be 100, 150, 200 Hz, etc. Electrical appliances and generators all produce harmonics and are regulated under the International Electrotechnical Commission (IEC) Electromagnetic Interference (EMI) standards. However in large volumes, these harmonics can add up to cause interference that can result in vibration of elevators/ motors , flickering of TV monitors and fluorescent lamps, heating of the transformers, degradation of sound quality, malfunctioning of control devices and in the worst case even fires. Several of the forms of DGs are connected to the distribution network via an interfacing inverter (e.g.: PVs, fuel cells, micro-turbines. The inverter is a very versatile unit and while its main function will be to control the export of real power. it may also be called upon to provide reactive power support as an ancillary service to the DNO or as a condition of xxxxxxxxxx.xx the UK, the ENA’s ER G99 clarifies these requirements. On the other hand, harmonic distortion that arises from the increased use of nonlinear electronic devices such as inverters, power electronic devices etc.. may degrade the grid power quality. Furthermore, due to the widely used LC filters in the grid connected converters, harmonic resonances resulting from the aggregated shunt-connected capacitors for a number of LC filters, the capacitive loads, as well as the power factor correction capacitors are becoming a power quality
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