Current-based models of FACTS devices for three-phase load-flow calculations using the Newton–Raphson method

Vinkovic, Anton; Suhadolc, Marko; Mihalič, Rafael

doi:10.1016/j.ijepes.2012.08.070

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…Anew approach to model OUPFC is developed known as current based model. This model shows the better convergence and reliability of the existed system [3]. Recent literature reveals PIM of OUPFC for optimal power system performance.…”

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confidence: 77%

Analysing Powe Flow Solution with Optimal Unified Power.Flow Controller

Srilatha¹,

Sivanagaraju²

2017

IJET

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Abstract-The electric power system function is to maintain the power plants under pool operation and utility centers to supply the active and reactive powers demanded by the loads connected to the system. Now a day's transmission systems are difficult to operate as well as more stressed due to unscheduled power flows and more losses of growing demand. However many HV systems are operating below thermal rating due to the voltage and stability limit. Later on rapid development in the technology introduces high rating and fast acting switching devices with power electronic components. Flexible AC transmission system (FACTs) controllers equipped with fast acting semi conductor devices designed to control one or more power system parameters for the effective operation of system. In this paper, a novel FACTs controller namely, optimal unified power flow controller (OUPFC) is proposed with its current injection model along with its incorporation procedure. The effect of this device on system parameters is analyzed on standard test systems with its graphical and numerical results.Keyword-Optimal unified power flow controller; Current based model; PST; UPFC I. INTRODUCTION The technological developments in power electronics industry increases the opportunities to develop new kind of flexible AC transmission system controllers popularly known as FACTs controllers. In general, the conventional FACTs controllers can control either the bus voltage magnitude, voltage angle at buses or active and reactive power flow in transmission lines. Due to this, the existing controllers can be called as single function controllers. In real, to solve the practical problems, the realistic controllers must control the multiple system parameters simultaneously rather than single system parameter.This led to the development of FACTS devices over which OUPFC is the effective device developed to improve the power system reliability by controlling the power flow through lines. OUPFC consists of the combination of UPFC and PST which exhibit their individual better features in controlling power flows in transmission lines. UPFC able to control real, reactive power flows and voltage magnitude at the buses and PST controls phase angle of the bus voltages [1-2].Previously power injection and voltage based models have been developed to model the FACTS devices. Anew approach to model OUPFC is developed known as current based model. This model shows the better convergence and reliability of the existed system [3]. Recent literature reveals PIM of OUPFC for optimal power system performance. This model was tested with OPF algorithm to optimize the fuel cost and loss [4]. A. Lashkar Ara et al., developed contingency analysis based OUPFC to minimize average loadability on transmission system and to enhance system security under single contingency condition [5].After careful review of the literature, it is noticed that, using optimal unified power flow controller (OUPFC) multiple system parameters can be controlled. The existing literature presents the power...

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confidence: 77%

Analysing Powe Flow Solution with Optimal Unified Power.Flow Controller

Srilatha¹,

Sivanagaraju²

2017

IJET

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“…A universal current‐based approach for FACTS devices is presented in Vinkovic et al, it is also “branch oriented” to deal with phase unbalances. FACTS are modelled by phase currents whose equations are split into real and imaginary parts.…”

Section: Facts and Hvdcmentioning

confidence: 99%

Augmenting load flow software for reliable steady‐state voltage stability studies

Sarnari

Živanović

Al-Sarawi

2019

Int Trans Electr Energ Syst

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Summary For decades, researchers and practitioners have developed improvements for Newton‐Raphson (N‐R) load flow to overcome some of its limitations. In this paper, we present a novel method to solve those inherent iterative algorithm limitations. It is based on N‐R combined with a supplementary algorithm that uses the discrete Fourier transform (DFT) and robust Padé approximants (PAs) and it is suitable for planning and simulation studies. This novel method analyses bus behaviour from the loading perspective where plain N‐R may not converge to the correct results. Thus, avoiding possible performance deficiencies when bus loading approaches the stability limit or when starting point is not close enough to the actual operating value. The proposed method samples voltages in the complex domain to attain superior convergence properties, guaranteeing high accuracy within the bus‐voltage stability limits (VSLs). Additionally, as a by‐product of the proposed method, load buses can be classified according to their criticality. The presented method will suit existing N‐R‐based systems with minor modifications, allowing practitioners to preserve their investment in load flow software. Results and performance comparisons with the conventional N‐R, holomorphic embedding load flow method (HELM), and continuation power flow (CPF) are presented to demonstrate the robustness of the proposed method.

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“…The FACTS controllers can be modeled in three ways for static applications: (a) current injection model (CIM), (b) impedance insertion model (IIM), and (c) power injection model (PIM). These methods preserve the admittance matrix's symmetrical feature, making FACTS controllers easy to integrate into existing power system analytical software resources 8‐10 . FACTS controllers have the potential to improve the security of the power system.…”

Section: Introductionmentioning

confidence: 99%

Assessment and enhancement of static power system security with multi‐line FACTS devices under congestion conditions

Upputuri

Kumar

2021

Int Trans Electr Energ Syst

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Summary Deregulation of power system is advantageous economically, but this affects the voltage and thermal stability of the transmission lines. These effects on the transmission line are assessed by the stability analysis of the power system. Various power system security parameters/indices are proposed in the literature, but only a few are used in security assessment studies. In this work, numerous critical sensitive indices are considered in terms of transmission line loading and bus voltage magnitude deviation to carry out security assessment studies. The optimal placement of FACTS devices enhances the security of the power system. Therefore, in this work, multi‐line unified power flow controllers (UPFC, GUPFC) are employed for power system security enhancement. The present paper provides an in‐depth security assessment for the power system incorporated with multi‐line UPFCs operated with and without control modes (voltage, active, and reactive power) at different case scenarios. These cases constitute normal, transaction, and contingency conditions of a deregulated power system operating at specified transaction limits. The proposed security enhancement strategy is implemented on standard IEEE test systems such as the 30‐ and 118‐bus systems. The results obtained with UPFC and GUPFC are promising for security enhancement of a power system constricted to the specified transaction limits. Among the FACTS controllers, GUPFC has shown better performance, especially in contingency conditions.

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Current-based models of FACTS devices for three-phase load-flow calculations using the Newton–Raphson method

Cited by 9 publications

References 15 publications

Analysing Powe Flow Solution with Optimal Unified Power.Flow Controller

Analysing Powe Flow Solution with Optimal Unified Power.Flow Controller

Augmenting load flow software for reliable steady‐state voltage stability studies

Assessment and enhancement of static power system security with multi‐line FACTS devices under congestion conditions

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