Partitioning-Based Unified Power Flow Algorithm for Mixed MTDC/AC Power Systems

Bizzarri, Federico; Giudice, Davide del; Linaro, Daniele; Brambilla, A.

doi:10.1109/tpwrs.2021.3052917

Cited by 14 publications

(8 citation statements)

References 42 publications

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“…To calculate the MTDC system, the outputs of DC sources, the power control of multi-VSCs and the power loss of VSCs need to be considered. Generally, the existing methods for power flow calculation of the MTDC system can be mainly divided into two categories: the sequential methods [8][9][10][11][12][13] and the unified methods [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…A double-layer loop iterative method is proposed in [11] to improve the convergence of the sequential method where the approximation is introduced into the calculation. In [12], the MTDC system is divided into smaller sub-systems and analyzed separately to improve computational efficiency. Also, to further improve the computational speed, the iteration of the sequential method is simplified by approximating the VSC current in [13].…”

Section: Introductionmentioning

confidence: 99%

“…For example, when the Quan MTDC system contains multiple VSCs with the droop control or the system is with multiple AC and DC grids, multiple coupling variables need to be determined by the iterative process which does not converge until all coupling variables converge [11]. Therefore, with the increase of the number of VSCs, it would be a challenge to make a large number of coupling variables converge at the same time [12]. Although the approximation is adopted in [11] to improve the convergence of the sequential method, approximations will reduce the calculation accuracy.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

General Power Flow Calculation for Multi-Terminal HVDC System Based on Sensitivity Analysis and Extended AC Grid

Zhao

2022

IEEE Trans. Sustain. Energy

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The power flow calculation of the multiterminal high voltage direct current (MTDC) system is essential for planning sustainable energy sources and power flow analysis for the MTDC system. However, the traditional unified methods require a large system of non-linear equations leading to low calculational efficiency. Also, for a large DC grid, there is a concern about the convergence of sequential methods. This paper proposes a general power flow calculation method for voltage source converter (VSC) based MTDC systems. Based on an extended topology of an AC grid, a generalized calculation model of the MTDC power flow is proposed. Then, a novel sensitivity analysis-based power flow (SAPF) method is proposed, in which the state variables of the extended AC grid are calculated via sensitivity analysis. With a smaller system of equations, the proposed SAPF method has less computational burden than the traditional unified methods and causes no convergence problem compared to sequential methods. To further improve the calculational efficiency, the sensitivitybased variable updating is adopted to accelerate the iterative process. By comparing with the existing methods in calculating power flow for different MTDC systems, including large systems with multiple AC/DC grids, the effectiveness and scalability of the proposed methods are verified.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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General Power Flow Calculation for Multi-Terminal HVDC System Based on Sensitivity Analysis and Extended AC Grid

Zhao

2022

IEEE Trans. Sustain. Energy

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show abstract

Section: Introductionmentioning

confidence: 99%

“…A common condition for multi-area AD/DC system is that several AC regional subsystems are connected by HVDC tie-lines or high voltage alternating current (HVAC) tie-lines, for example, the high-voltage long distance power transmission system in Western China. In [3], a unified power flow calculation algorithm for AC/DC hybrid system based on the grid partitioning is presented. In [4], a flexible regulation model for the multi-terminal flexible direct current (MTDC) grid is proposed to promote wind power accommodation, and the distributed optimization is adopted to achieve the operation independently of regional dispatch entities.…”

Section: Introductionmentioning

confidence: 99%

Decentralized robust dispatch for multi‐area AC/DC system considering wind power uncertainty

Zhao

Liu

et al. 2021

IET Generation Trans & Dist

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This paper proposes a decentralized robust dispatch method for multi-area AC/DC system considering wind power uncertainty. The accommodated wind power interval model is adopted to handle the inherent uncertainty and volatility of wind generation, which is modelled based on the affinely adjustable robust optimization method. The accommodated wind power interval and the automatic generation control participation factors are optimized simultaneously to accommodate more wind energy and ensure operational reliability of the entire multi-area system. The flexible adjustment model of HVDC converter station is also presented to accommodate more wind power. Then, the resulting economic dispatch model for multi-area system is solved in a fully decentralized and parallel manner using accelerated alternating direction method of multipliers algorithm to preserve the information privacy and dispatch independence of each region. Case studies illustrate the effectiveness of the proposed model.

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Modular Multilevel Converters: Key Features, Control Strategies and Main Challenges

Giudice

Bizzarri

Linaro

et al. 2022

Modular Multilevel Converter Modelling and Simulation for HVDC Systems

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Partitioning-Based Unified Power Flow Algorithm for Mixed MTDC/AC Power Systems

Cited by 14 publications

References 42 publications

General Power Flow Calculation for Multi-Terminal HVDC System Based on Sensitivity Analysis and Extended AC Grid

General Power Flow Calculation for Multi-Terminal HVDC System Based on Sensitivity Analysis and Extended AC Grid

Decentralized robust dispatch for multi‐area AC/DC system considering wind power uncertainty

Modular Multilevel Converters: Key Features, Control Strategies and Main Challenges

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