Abstract
The article considers a hybrid power quality conditioner (HQPC) for 3-phase 4-wire systems with a distributed modular structure. Some conditioner modules provide compensation for the component currents and voltages that form the negative and zero sequence systems. The open structure of the HQPC, consisting of independent modules, allows compensating for distortions of currents and voltages of the 3-phase network caused by the nonlinear nature and asymmetry of single-phase loads. The compensation characteristics of the proposed conditioner were researched using a model developed in the MatLab environment. The simulation showed that the proposed conditioner can ensure normalization of power quality in 3-phase 4-wire system at various modes of network operation.
Highlights
The issue of ensuring the power quality (PQ) in 3-phase 4-wire systems has become important in recent years
A more economical version of unified power quality conditioner (UPQC) for 3-phase 4wire systems is proposed in the article [7]
The article considers a HQPC for 3-phase 4-wire systems that provides compensation for current and voltage distortions caused by the nonlinear nature and asymmetry of single-phase loads
Summary
The issue of ensuring the power quality (PQ) in 3-phase 4-wire systems has become important in recent years. The widespread use of nonlinear single-phase loads has led to the fact that the asymmetry and non-sinusoidal nature of currents and voltages in 3-phase 4-wire systems have become permanent factors that reduce the efficiency of power supply systems [1, 2] It should be taken into account that many consumers in such systems have increased requirements for power quality [3, 4]. A more economical version of UPQC for 3-phase 4wire systems is proposed in the article [7] It consists of two parallel hybrid filters that provide separate compensation for the symmetric components of the negative and zero sequence. Power quality conditioners, considered in [7 – 9], allow to solve the problems caused by harmonic distortion and unbalanced (asymmetric) load These devices are designed to regulate PQ in network nodes that are connected to a concentrated non-linear load. A model in the MatLab (Simulink) environment was developed to study the characteristics of HPQC
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