Probabilistic load flow calculation of AC/DC hybrid system based on cumulant method

Sun, Yinfeng; Xia, Dapeng; Gao, Zichun; Wang, Zhenhao; Li, Guoqing; Lü, Wei; Wu, Xueguang; Li, Yang

doi:10.1016/j.ijepes.2022.107998

Cited by 21 publications

(4 citation statements)

References 26 publications

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“…Figure 5 illustrates the topology of the AC/DC system, comprising four DC branches. The parameters of each branch and the base state data used in this study can be referenced from the BPA software and literature [17].…”

Section: Case Analysismentioning

confidence: 99%

Cascading fault prevention strategy based on economic dispatch of AC-DC systems

DENG,

XIE,

HUANG

et al. 2024

Preprint

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To achieve effective prevention of cascading faults in the economic dispatch of AC and DC systems, this paper proposes a preventive control strategy considering both safety and economy, and constructs a bi-level nonlinear optimization model. Initially, a mathematical criterion for discriminating cascading tripping is formulated based on the action characteristics of relay protection. Subsequently, a static safety margin index, using unit active output as the control variable, is established to measure the safety level of the AC/DC system. Then, an economic index is derived by integrating network loss, unit power supply cost, and environmental management cost. The inner-layer model aims to solve the static safety margin, while the outer-layer model utilizes the safety margin solved by the inner layer as a constraint to minimize the comprehensive cost of the grid.Furthermore, a two-layer particle swarm algorithm is proposed to solve the bi-level preventive control model. Additionally, a Jacobi matrix preprocessing method combined with sparse storage technology is employed to enhance computational efficiency during the power flow calculation process. Comparative analysis with other algorithms is conducted to demonstrate the effectiveness of the proposed algorithm. Finally, the proposed algorithm and model are simulated and analyzed using the improved IEEE39 node system to verify the feasibility of the proposed strategy.

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Section: Case Analysismentioning

confidence: 99%

Cascading fault prevention strategy based on economic dispatch of AC-DC systems

DENG,

XIE,

HUANG

et al. 2024

Preprint

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show abstract

“…In [13], a model predictive control-based scheduling method for user-side energy storage is proposed, optimizing control with the objective of economic efciency. In [14], a fuzzy control method is employed to dynamically adjust the weight coefcients of multiple objectives, forming an energy management strategy for hybrid oil-electric systems and achieving global optimal control. Te advantage of this approach is that it can yield an efective unique solution.…”

Section: Introductionmentioning

confidence: 99%

The Multiobjective Control Based on Tolerance Optimization in a Multienergy System

Ma,

Li,

Jiang

et al. 2024

International Transactions on Electrical Energy Systems

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To address the issue of multiobjective control in multienergy systems with diverse operational objectives, a two-stage optimization framework based on expected point tolerance has been proposed in this paper. In the first stage, a single objective function is used for optimization control to obtain the expected point of the multiobjective optimization problem. Then, in the second stage, by defining the allowable deviation between each optimization objective and the expected point, the original multiobjective optimization problem is transformed into a single objective optimization problem solution with tolerance measurement. Finally, in the simulation scene of a multienergy system, it is demonstrated that compared with the optimal results under each single objective method, the proposed method increases power line loss, maximum voltage deviation, new energy consumption, and economy by 2.22, 2.30, 1.02, and 2.45 times, respectively. Compared with the suboptimal results, the proposed method reduces power line loss by 22.26, 1.74, 1.09, and 0.97 times, respectively. Combining the shape of the Pareto frontier, it is demonstrated that the proposed method can comprehensively consider the needs of multiple power optimization objectives for forming a more reasonable and effective system optimization scheduling and also provide a new approach for solving multiobjective optimization problems.

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“…A main feature of the modern power grid is the alternating current (AC) system and direct current (DC) system hybrid connection [1,2]. The high-voltage direct current (HVDC) changes the operation characteristics of power grids [3], and it is more complex to control the AC-DC hybrid power grid. When the power grid blackouts, the HVDC needs to deeply participate in the restoration, which makes new changes in the AC-DC power grid restoration.…”

Section: Introductionmentioning

confidence: 99%

A novel method of restoration path optimization for the alternating current–direct current bulk power grid after a major blackout

Yang,

Liang,

Cheng

et al. 2023

IET Generation Trans & Dist

Self Cite

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The restoration control of the modern alternating current–direct current (AC–DC) hybrid power grid after a major blackout is difficult and complex. Taking into account the interaction between the line‐commutated converter high‐voltage direct current (LCC‐HVDC) and the AC power grid, this paper proposes a novel optimization method of restoration path to reconfigure the skeleton network for the blackout power grid. Based on the system strength, the supporting capability of the AC power grid for the LCC‐HVDC is first analysed from the aspects of start‐up and operation of LCC‐HVDCs. Subsequently, the quantitative relationship between the restoration path and the restoration characteristic of LCC‐HVDC is derived in detail based on the system strength indices of the short‐circuit capacity and the frequency regulation capability. Then, an optimization model of restoration path considering non‐tree paths is formulated and a feasible optimization algorithm is proposed to achieve the optimal path restoration scheme. A modified IEEE 39‐bus system and a partial power grid of Southwest China are simulated to show that the proposed method is suitable for the restoration of AC–DC power grids and can improve restoration efficiency. This research can be an important guidance for operators to rapidly restore the AC–DC power grid.

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Probabilistic load flow calculation of AC/DC hybrid system based on cumulant method

Cited by 21 publications

References 26 publications

Cascading fault prevention strategy based on economic dispatch of AC-DC systems

Cascading fault prevention strategy based on economic dispatch of AC-DC systems

The Multiobjective Control Based on Tolerance Optimization in a Multienergy System

A novel method of restoration path optimization for the alternating current–direct current bulk power grid after a major blackout

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