Phd Thesis On Power Quality

Phd Thesis On Power Quality-71
The Fuzzy Logic Controller (FLC) based DSTATCOM has been implemented and it has been verified that its transient response is better than the PI Controller response.With the increased penetration of small scale renewable energy sources in the electrical distribution network, maintenance or improvement of power quality has become more critical than ever where the level of voltage and current harmonics or disturbances can vary widely.

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Further, the obtained results are compared with the values given in the available standards.

Lastly optimal PQ parameters at a poc are defined for flicker, harmonics and voltage dips.

For this reason, Custom Power Devices (CPDs) such as the Unified Power Quality Conditioner (UPQC) can be the most appropriate solution for enhancing the dynamic performance of the distribution network, where accurate prior knowledge may not be available. (2013) Power Quality Improvement of Distributed Generation Integrated Network with Unified Power Quality Conditioner.

Therefore, the main objective of the present research is to investigate the (i) placement (ii) integration (iii) capacity enhancement and (iv) real time control of the Unified Power Quality Conditioner (UPQC) to improve the power quality (PQ) of a distributed generation (DG) network connected to the grid or microgrid.

The PQ level in the network is also highly influenced by PQ emission behaviors of customer's devices and the network characteristics.

During the last decades, PQ related complaints have increased largely.Moreover, it was proposed that the 3rd harmonic summation coefficient value of the standard can be modified to a higher value as sufficient diversity is found in the system.Regarding voltage dips, the numbers of planning and compatibility levels are proposed for a MV network in the Netherlands.The thesis is based on practical field measurements of PQ parameters in the network, on analyzing the developed network models by using computer simulations and laboratory experiments.The most important part of the work is the verification of simulation results with thepractical measurements.A summary of the research work reported in this thesis is as follows: • Obtained a deeper insight in PQ problems around the world • Developed typical network models for computer simulations on different PQ phenomena (such as flicker, harmonics and voltage dips) and verified the results with field measured data • Gathered practical information on various technical and financial consequences of inadequate PQ for different parties namely: the network operators, the customers and the equipment manufacturers • Made an inventory on various existing (and developing) standards and technical documents on PQ around the world.Then, compared the limits given on various PQ parameters in those standards/documents and discussed their relevance and applicability in the future • A proposal is given about optimal PQ limits (for flicker, harmonics) at the low voltage (LV) customer's POC Also, the average and maximum values of voltage dips in the networks are estimated • Suitable planning level limit values for flicker, harmonics and voltage dips are proposed • PQ related responsibilities of the customers, network operators and device manufacturer at the customer's POC are defined The main conclusions and thesis contributions are: • It is found that a harmonization among the presently available PQ standards is required and a dedicated set of global standards is needed to get optimal PQ at the customer's POC Various limiting values on different PQ parameters (e.g.The DC Link voltage is increased above the reference value when the load is suddenly removed and it is decreased below its reference valuewhen the load is suddenly increased.Conventionally, a Proportional Integral (PI) controller is used to maintain the DC Link voltage at the reference value.The efficiency of the DVR depends on the performance of the control technique, which involved in switching the inverters.The hysteresis voltage control has a very fast response, simple operation and variable switching frequency.


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