Denisa Rusinaru

Usage based allocation for transmission costs under open access

This paper analyses some issues related to the transmission cost allocation for grids with open access. Allocation methods based on electricity tracking are presented and compared with methods based on sensitivities as well as with the postage stamp rate. The main purpose is to appraise in a critical manner the practicality of these methods and their capacity to send efficient economical signals. Full and usage capacity pricing are presented in contrast. Three options for dealing with counter flows are considered and their influence on cost recovery under used capacity pricing is outlined. The pricing strategies and methodologies are depicted for a 9-bus test-system including pool, bilateral and wheeling transaction.

Congestion management using dispatch or phase shifting transformers

This paper deals with two categories of congestion management methods. The dispatch method is analyzed in two versions: static and differential, each one applied to outputs or to loads. The static method used the contributions to congesting flows, whereas the differential counts for the impact on flows before and after congestion management. The results for static and differential cost allocation are compared with the postal stamp. The development of FACTS devices and control techniques has provided efficient tools for dealing with congestion management. Phase shifting transformers are employed as a substitute method for dispatch. Two alternate locations are exemplified for managing congestion under a particular operation regime.

Power quality general levels in distribution networks

This paper has focused on power quality investigation based on complex measurements in the substations of local distribution networks. The distribution network area chosen for the present analysis is of interest for a further renewable sources connection. For the power quality assessment a new type of information report is discussed as viable future alternative for network operator. According to this, the phenomena are evaluated and displayed in a unitary manner by using the ranking of power quality level based on normalized parameters. PQ disturbances maps can be drawn by using this condensed information format.

Powering knowledge transfer at INCESA - BRIDGE projects

The movement of know-how or technical knowledge from one organization to another known as knowledge transfer in literature is considered to be one of the most important components of the strategic plan of a research institute. Despite the fact that INCESA (Research Hub of Applied Sciences, University of Craiova) is a young organization, it already counts an important number of collaborations with the local and regional business environment. Consequently, it is developing a management strategy that approaches the knowledge transfer (KT) to the industry as a recurrent event. The paper presents an overview of the KT to the industry as secured by INCESA. Two of the INCESAs KT-type projects financed by national grants and based on a partnership with the power distribution industry are the object of our analysis. The findings are used to refine the taxonomy of the KT channels in relation to INCESAs projects, and to feature a successful framework of the knowledge management at the micro level of the project, as well as at the meso-institutional level.

Symmetrical components based software for three-phase load flow analysis

This paper presents the principle of a load flow algorithm adjusted to asymmetrical operation of the three-phase distribution networks. The algorithm is based on an iterative procedure, which is independently applied on three equivalent sequence networks and uses a phase-to-phase equivalent model for unbalanced loads connected to the analyzed network.

Loss based performance index for the reactive power control

The reactive power is the major drawback of the AC electric grids. This paper proposes a performance index, “Q/loss”, based on the energy loss share of the MVAR flows. If computed with powers, the performance index is time-dependent and characterizes one grid operating regime. Calculated on energy basis, it stamps the quality of the MVAR control over a period of time. As outlined by simulations conducted for various IEEE test-systems as well as on a region of the Romanian transmission grid, the performance index ranges from few percent to some 15%. The energy loss related to the MVAR flows can be either be allocated to the grid operator or carried over the corresponding ancillary service: reactive power supply for voltage regulation.

Application Development to Convert Heterogeneous Information into PQDIF (Power Quality Data Interchange Format)

In this paper is presented a web-based application development, used to convert heterogeneous information provided by MEG40 (power acquisition equipment) into standard formats as PQDIF (Power Quality Data Interchange Format IEEE® Std 1159.3-2003 standard). The web-based solution proposed is able to convert huge volume of heterogeneous information into standard formats in order to be easily processed.

Three-phase load flow analysis of the unbalanced distribution networks

This paper summarizes the results of a three-phase load flow analysis case study. This work was part of an overall energy systems modeling and analysis effort designed to develop a validated power flow study that facilitates understanding of power flow concepts for the present distribution networks operating in asymmetry conditions. To simplify data collection requirements and illustrate key concepts, a representative HV power distribution network with unbalanced loads was chosen for the study. The analysis methodology used in this illustrative case study and the lessons learned from the study could assist the grid operator in conducting power flow studies of operational areas of interest.

Assessment of reactive power related to users of transmission network

This paper deals with the assessment of reactive powers related to network users for payment and compensation purposes. The drawbacks are evaluated and compared with the benefits for voltage regulation, according to Romanian regulations. Theoretical skills are combined into one organic methodology, and an in-house software package for reactive power assessment is built. This is based on sensitivities of voltage, loss and transmission capacity to reactive injections into nodes. A case study consisting of a real 110kV network of about 2000 nodes was adopted. The results were used to evaluate the opportunities to compensate and/or to discharge payments the MVARs with positive contribution to voltage regulation.

Fuzzy logic approach in fatigue of the laminated composites used for manufacturing of electrical equipments' components

Fuzzy logic is a convenient method for expressing vague categories of information and provides the tools for performing logic operations with these information by using of fuzzy sets. In this work, the fuzzy system was developed for analyzing fatigue aspects of the laminated composites used in manufacturing of insulating components of the new generation electrical equipments. Using experimental data as model validation, a fuzzy model was developed for a glass tissue laminated composite. Compare with other methodologies, more information is found in this kind of results, having also a relatively wide applicability.