Abstract
In order to study the influence on harmonic characteristics of distribution network with renewable energy, a simplified model of distribution network is established to analyse theory while considering the influence of cable on the system capacitive current. Establishing an actual distribution network model by Digsilent to research the harmonic characteristics impact when photovoltaic power with PV incorporated the distribution network in a variety of different access , while using constant current source model as harmonic source model which often been used in engineering practices. The simulation results show that: optimizing the access location and dispersion of PV can decrease the waveform distortion levels in distribution network and a certain number of high-order harmonic will magnify by a specific grid structure, deteriorating the distribution network power quality.
Highlights
Fossil fuels, mainly including oil, coal and natural gasbased, is gradually coming to exhaustion, and in response to the energy crisis, governments began to put renewable energies, such as wind power and solar power onto the strategic agenda [1]-[3]
Distributed PV is one of the most potential renewable energy technologies, but which produces significant harmonics, so a study on how renewable energy would influence the harmonic characteristics of distribution network, where the three-phase PV inverters [6] act as study object, has been made in this paper
Models of power electronic devices and distribution network have been built in [8], where harmonic characteristics of distribution network integrated with DG are analysed in detail, but only the effects of high-order harmonics under ideal conditions are taken into major consideration
Summary
Mainly including oil, coal and natural gasbased, is gradually coming to exhaustion, and in response to the energy crisis, governments began to put renewable energies, such as wind power and solar power onto the strategic agenda [1]-[3]. Photovoltaic (referred to as PV) roof and small household wind power, which are both classified as renewable energy, will change the power structure of the distribution network, resulting in complex effects on the network [4]. Effects of grid-connection of renewable energy generation on harmonic characteristics in distribution network, was exhaustively studied by changing the factors including how and where the PV is grid-connected, PV capacity, etc. A simulation of actual distribution network has been made using Digsilent Power Factory, indicating that, the level of waveform distortion in distribution network would be lowered by optimizing location and manner of dispersion of PV grid-connection, and some particular grid structures could amplify one or several degrees’. Harmonics, which causes severe harmonic distortion that the system can’t bear damaging the system
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