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This paper addresses the issue of the evaluation of how modern and restructured Transmission and Distribution (T&D) infrastructures help accomplish the so-called EU 2020 targets, in terms of efficiency increase, CO2 reduction and a wider employ of renewable energy resources. A methodology is proposed in order to quantify the possible environmental benefits as well as the power quality improvement...
Based on the research subject of harmonic pollution of Nanhai in Foshan, a harmonics survey in Nanhai gird is presented in this paper, on which a large number of statistical analysis have been worked. This survey takes almost a year and includes 490 enterprises, 772 distribution transformers at 12 towns. According to inspecting results, it shows that the harmonic pollution in Nanhai city is more severe...
Injection of the wind power into an electric grid affects the power quality. The performance of the wind turbine and thereby power quality are determined on the basis of measurements and the norms followed according to the guideline specified in International Electro-technical Commission standard, IEC-61400. The influence of the wind turbine in the grid system concerning the power quality measurements...
With the development of power grid interconnection, the low frequency oscillation is becoming more and more prominent which threats the stability of the system. It consists of local modes and inter-area modes, and the effectiveness of local PSS in damping inter-area modes is limited. Then the global power system stabilizer (GPSS) based on WAMS (Wide Area Measurement System) is proposed. First 3 problems...
Along with the rapid development of power electronic technology, the application of non-liner load becomes more and more with the capacity becomes larger and larger. Massive harmonics are poured into the power grid, leading to the distortion of the system voltage and current. Meanwhile, the nonliner loads usually own complex characteristics such as power inrushing, three phase imbalance, harmonics,...
Excessive harmonic distortion has been reported in some distribution grids with a high number of photovoltaic inverters. In this paper, a simple model is introduced to describe the interaction between grid components and groups of inverters which can lead to amplification of harmonic voltages. The model is validated by using extensive measurements for several types of commercially available photovoltaic...
This paper presents and discusses the results of several measurements carried out on photovoltaic systems connected to LV-grid, from the harmonic distortion viewpoint. The PV-system inverters are characterised by different ratings, in the range of 850 W up to 3 kW, and different structures, including low-frequency and high-frequency transformers. The harmonics emission and the total harmonic distortion...
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