Low Frequency AC Transmission Upgrades With Optimal Frequency Selection

Sehloff, David; Roald, Line

doi:10.1109/tpwrs.2021.3107193

Cited by 15 publications

(14 citation statements)

References 44 publications

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“…From the lumped parameter Π model circuit, we solve for series impedance Z ser and shunt admittance Y sh in terms of the values in (10):…”

Section: Calculating Positive Sequence Impedancementioning

confidence: 99%

“…In this section, we present a model for power flow in systems with one or more LFAC branches. The model is largely a review of the model in [10] but adds details on how to incorporate LFAC cables. In this framework, each portion of the network which has an independent frequency is called a subnetwork, and each subnetwork can transfer power to another only through a frequency conversion interface, which represents the AC/AC converter.…”

Section: Optimal Power Flow With Lfac Cablesmentioning

confidence: 99%

“…This paper presents an optimization framework that computes an optimal economic dispatch with the cables and LFAC in place. We build on the AC optimal power flow (OPF) model presented in [10], which includes frequency as a variable. With this LFAC OPF model, system operators and utilities can analyze the system-level advantages of using LFAC for system hardening.…”

Section: Introductionmentioning

confidence: 99%

“…With this LFAC OPF model, system operators and utilities can analyze the system-level advantages of using LFAC for system hardening. However, the existing LFAC model in [10] is focused on overhead lines. In overhead lines, the frequency dependence due to the current redistribution from the skin effect and proximity effects is small and often neglected in steady-state.…”

Section: Introductionmentioning

confidence: 99%

“…To enable the accurate analysis of LFAC cables within an optimal power flow framework, we propose a new frequency-dependent model for power flow in cables. This is incorporated into the modeling framework in [10], and used to analyze system behavior when a large number of lines are undergrounded to reduce wildfire risk.…”

Section: Introductionmentioning

confidence: 99%

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Enabling Undergrounding of Long-Distance Transmission Lines with Low Frequency AC Technology

Sehloff¹,

Roald²

2022

Preprint

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With increasing prevalence of severe natural hazards and the ignition of wildfires by power lines, many power system planners are considering converting overhead lines to underground cables to mitigate risks related to these events. Systems with a large proportion of underground cables can bring challenges due to the capacitance and losses of the cables, factors which may limit the potential for hardening in critical areas. Low frequency AC (LFAC) transmission solves these problems, as lowering the frequency decreases both the effects of capacitance and the losses. This paper presents a tractable frequencydependent model for underground cables and incorporates it into the open source optimal power flow tool VariableFrequencyOPF.jl. The model and implementation are used to demonstrate the benefits of LFAC in a case study involving two multi-terminal cable upgrades with LFAC, including a comparison with HVDC. The results demonstrate the value of LFAC systems for both power flow control and reduction of losses.

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“…From the lumped parameter Π model circuit, we solve for series impedance Z ser and shunt admittance Y sh in terms of the values in (10):…”

Section: Calculating Positive Sequence Impedancementioning

confidence: 99%

Section: Optimal Power Flow With Lfac Cablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enabling Undergrounding of Long-Distance Transmission Lines with Low Frequency AC Technology

Sehloff¹,

Roald²

2022

Preprint

Self Cite

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Modified jaya optimization and TOPSIS for determining the optimal frequency in LF-HVac

Anand,

Goswami,

Chatterjee

et al. 2024

Applied Soft Computing

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Electromechanical transient simulation model of low frequency flexible transmission system based on modular multilevel matrix converter

Yang¹,

Hua

Lin

et al. 2022

J. Phys.: Conf. Ser.

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Low frequency AC transmission has broad prospects in the future power system. How to establish its electromechanical transient simulation model and provide basic research means for its adaptability analysis after connecting to the large power grid is an urgent problem to be solved. Based on the existing electromechanical transient simulation methods, the mathematical model of modular multilevel matrix converter (M3C) is simplified, and an electromechanical transient simulation model composed of virtual DC circuit and equivalent AC circuit is proposed. On this basis, the power and voltage controller is designed according to the power decoupling characteristics of M3C. Further considering the operation requirements of the offshore wind power transmission system through low frequency AC transmission, an island control is designed to make M3C have the ability of passive control. Numerical examples verify the effectiveness of the proposed simulation model, which can effectively respond to short-circuit faults and power loss. This model can better meet the calculation requirements of large power grid simulation.

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Low Frequency AC Transmission Upgrades With Optimal Frequency Selection

Cited by 15 publications

References 44 publications

Enabling Undergrounding of Long-Distance Transmission Lines with Low Frequency AC Technology

Enabling Undergrounding of Long-Distance Transmission Lines with Low Frequency AC Technology

Modified jaya optimization and TOPSIS for determining the optimal frequency in LF-HVac

Electromechanical transient simulation model of low frequency flexible transmission system based on modular multilevel matrix converter

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