Abstract
Due to the rapid advancement in power electronic devices in recent years, there is a fast growth of non-linear loads in distribution networks (DNs). These non-linear loads can cause harmonic pollution in the networks. The harmonic pollution is low, and the resonance problem is absent in distribution static synchronous compensators (D-STATCOM), which is the not case in traditional compensating devices such as capacitors. The power quality issue can be enhanced in DNs with the interfacing of D-STATCOM devices. A novel three-phase harmonic power flow algorithm (HPFA) for unbalanced radial distribution networks (URDN) with the existence of linear and non-linear loads and the integration of a D-STATCOM device is presented in this paper. The bus number matrix (BNM) and branch number matrix (BRNM) are developed in this paper by exploiting the radial topology in DNs. These matrices make the development of HPFA simple. Without D-STATCOM integration, the accuracy of the fundamental power flow solution and harmonic power flow solution are tested on IEEE−13 bus URDN, and the results are found to be precise with the existing work. Test studies are conducted on the IEEE−13 bus and the IEEE−34 bus URDN with interfacing D-STATCOM devices, and the results show that the fundamental r.m.s voltage profile is improved and the fundamental harmonic power loss and total harmonic distortion (THD) are reduced.
Highlights
In terms of harmonics, the loads are classified into two types, linear loads and nonlinear loads
The proposed three-phase fundamental power flow algorithm (FPFA) is examined on IEEE−13 bus unbalanced test feeder without interfacing of D-STATCOM device
This paper proposes new three-phase power flow algorithm (PFA) for unbalanced radial distribution networks (URDN) with the presence of linear and non-linear loads and D-STATCOM devices
Summary
The loads are classified into two types, linear loads and nonlinear loads. The use of non-linear loads can inject harmonic currents into URDN. The authors of [6] developed an iterative time-dependent, computer-aided HPFA by combining the time-dependent cross-coupled harmonic model. For allocating and sizing of capacitors optimally, a flower pollination algorithm is proposed in [10].In [11,12], a novel three-phase power flow algorithm for URDN with multiple integrations of distributed generations (DGs) and a D-STATCOM device is presented. In [19], an optimal algorithm to control a three-phase D-STATCOM is proposed This algorithm can give harmonic compensation as well as reactive power compensation in linear and non-linear loads, which are connected in three-phase. The solution of the fundamental power flow algorithm (FPFA) discussed in this paper is used in modelling the linear and non-linear loads for HPFA.
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