Flexible Security-Constrained Optimal Power Flow

Abstract:The successful application of the unified power flow controller (UPFC) provides a new control method for the secure and economic operation of power system. In order to make the full use of UPFC and improve the economic efficiency and static security of a power system, a preventive security-constrained power flow optimization method considering UPFC control modes is proposed in this paper. Firstly, an iterative method considering UPFC control modes is deduced for power flow calculation. Taking into account the influence of different UPFC control modes on the distribution of power flow after N-1 contingency, the optimization model is then constructed by setting a minimal system operation cost and a maximum static security margin as the objective. Based on this model, the particle swarm optimization (PSO) algorithm is utilized to optimize power system operating parameters and UPFC control modes simultaneously. Finally, a standard IEEE 30-bus system is utilized to demonstrate that the proposed method fully exploits the potential of static control of UPFC and significantly increases the economic efficiency and static security of the power system.

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“…The k + 1 time UPFC injection power can be calculated by Equations (10)- (14). The power flow result is obtained until ∆Z < ε.…”

Section: Impedance Compensation Control Mode (Iccm)mentioning

confidence: 99%

Preventive Security-Constrained Optimal Power Flow Considering UPFC Control Modes

Zhou

Liu

et al. 2017

Energies

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“…The above considerations motivate in deriving a new corrective SCOPF model to achieve the goal of minimizing the rescheduling of generators. Certain literatures [3]- [5] introduce the use of devices that are capable of providing the corrective control for preserving security, such as phase shifters [3] and power routers [4]. But, it is seen that phase shifter adjustment under given contingency may fail to converge.…”

Section: Introductionmentioning

confidence: 99%

The Effective Enhancement of Power System Security by Flexible Transmission Line Impedance with Minimal Rescheduling of Generators

Muthulakshmi¹,

Sasiraja²,

Muthu³

2016

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After the digital revolution, the power system security becomes an important issue and it urges the power producers to maintain a well secured system in order to supply a quality power to the end users. This paper presents an integrated Corrective Security Constrained Optimal Power Flow (CSCOPF) with Flexible Transmission Line Impedance (FTLI) to enhance the power system security. The corrective approach of SCOPF is chosen, because it allows the corrective equipment to bring back the system to a stable operating point and hence, it offers high flexibility and better economics. The concept of FTLI arises from the ability of FACTS devices such as Thyristor Controlled Series Capacitor (TCSC), which can vary the line reactance to a certain extent. An enhanced security can be achieved by incorporating FTLI into the CSCOPF problem, since the power flow in a system is highly dependent on the line reactance. FTLI based CSCOPF can reduce the amount of rescheduling of generators, but it will result in an increased number of variables and thus, the complexity to the optimization process is increased. This highly complex problem is solved by using nonlinear programming. The AC based OPF model is preferred, since the corrective security actions require highly accurate solutions. IEEE 30 bus system is used to test the proposed scheme and the results are compared with the traditional CSCOPF. It can be seen that the proposed idea provides a notable improvement in the reduction of cost incurred for restoring the system security.

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“…Moreover, in the research field of power system engineering, power flow studies have increasingly focused on one of the most significant problems: the high penetration of renewable energy resources into existing electric power networks[4]- [7]. For the purpose of realizing the rational operation of electric power networks, an objective function, e.g., minimizing the fuel cost of fossil power generation plants and minimizing the transmission line losses, can be optimized, and optimal power flow situations are realized.…”

Section: Introductionmentioning

confidence: 99%

Notice of Removal Dynamic optimal power flow in transmission networks with high penetration of intermittent renewable energy sources

Sugihara

Yamaguchi

Funaki

2015

2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE)

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For a high penetration of intermittent renewable energy sources, the transmission capacity constraints become more important for secure and economic operation of power systems because of the high variability in the transmission line current. In this study, the fundamental characteristics of the dynamic optimal power flow are analyzed with the line-temperature constraints in transmission networks. Numerical simulations show that the load reduction induced by the current variation can be reduced by the line-temperature constraints rather than the current constraints.

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Flexible Security-Constrained Optimal Power Flow

Cited by 29 publications

References 12 publications

Preventive Security-Constrained Optimal Power Flow Considering UPFC Control Modes

Preventive Security-Constrained Optimal Power Flow Considering UPFC Control Modes

The Effective Enhancement of Power System Security by Flexible Transmission Line Impedance with Minimal Rescheduling of Generators

Notice of Removal Dynamic optimal power flow in transmission networks with high penetration of intermittent renewable energy sources

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