Compensator configurations for load currents' symmetrization

International Conference on Applied Sciences 2015

Rusinaru, D.^1 ; Manescu, L.G.^1 ; Dinu, R.C.^1

University of Craiova, Faculty of Electrical Engineering, Electrical Engineering, Energetics and Aerospace Department, 107 Decebal Street, Craiova

200440, Romania^1

关键词: Compensator parameters;    Distribution substations;    Network operations;    Operation conditions;    Power factor corrections;    Reactive components;    Reactive power compensation;    Transformation matrices;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/106/1/012030/pdf
DOI  :  10.1088/1757-899X/106/1/012030

来源: IOP

【 摘 要 】

This paper approaches aspects regarding the mitigation effects of asymmetries in 3-phase 3-wire networks. The measure consisting in connecting of load current symmetrization devices at the load coupling point is presented. A time-variation of compensators parameters is determined as a function of the time-recorded electrical values. The general sizing principle of the load current symmetrization reactive components is based on a simple equivalent model of the unbalanced 3-phase loads. By using these compensators a certain control of the power components transits is ensured in the network. The control is based on the variations laws of the compensators parameters as functions of the recorded electrical values: [B] = [T]•[M]. The link between compensator parameters and measured values is ensured by a transformation matrix [T] for each operation conditions of the supply network. Additional conditions for improving of energy and efficiency performance of the compensator are considered: i.e. reactive power compensation. The compensator sizing algorithm was implemented into a MATLAB environment software, which generate the time-evolution of the parameters of load current symmetrization device. The input data of application takes into account time-recording of the electrical values. By using the compensator sizing software, some results were achieved for the case of a consumer connected at 20 kV busbar of a distribution substation, during 24 hours measurement session. Even the sizing of the compensators aimed some additional network operation aspects (power factor correction) correlated with the total or major load symmetrizations, the harmonics aspects of the network values were neglected.