Loss Minimization With Optimal Power Dispatch in Multi-Frequency HVac Power Systems

Journal Article · Thu Nov 21 00:00:00 EST 2019 · IEEE Transactions on Power Systems

DOI:https://doi.org/10.1109/TPWRS.2019.2953161· OSTI ID:1633611

Nguyen, Quan ^[1]; Lao, Keng-Weng ^[2]; Vu, Phuong ^[3]; Santoso, Surya ^[4]

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1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
2. Univ. of Macau, Taipa (China)
3. Hanoi Univ. of Science and Technology (Vietnam)
4. Univ. of Texas, TX (United States)

Low-frequency high-voltage ac transmission scheme has recently been proposed as an alternative approach for bulk power transmission. This paper proposes a multi-period optimal power flow (OPF) for a multi-frequency HVac transmission system that interconnects both conventional 50/60-Hz and low-frequency grids using back-to-back converters with a centralized control scheme. The OPF objective is to minimize system losses by determining the optimal dispatch for generators, shunt capacitors, and converters. The OPF constraints include the operational constraints of all HVac grid and converter stations. The resulting mixed-integer nonlinear programing problem is solved using a proposed framework based on the predictor-corrector primal-dual interior-point method. The proposed OPF formulation and solution approach are verified using a multi-frequency HVac transmission system that is modified from the IEEE 57-bus system. Here, the results with the optimal dispatch from the proposed method during a simulated day show a significant loss reduction and an improved voltage regulation compared to those when an arbitrary dispatch is chosen.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-76RL01830
• OSTI ID: 1633611
• Report Number(s): PNNL-SA--148760
• Journal Information: IEEE Transactions on Power Systems, Journal Name: IEEE Transactions on Power Systems Journal Issue: 3 Vol. 35; ISSN 0885-8950
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
Back-to-back converter
interior point method
low-frequency AC transmission
multi-frequency power systems
optimal power flow