A Sensitivity Analysis Method for Unbalanced Distribution Network based on Linearized Power Flow Model

Zhu, Tao; Xia, Tian; Wan, Zhenyi; Zhao, Chunfa

doi:10.1109/powercon.2018.8601793

Cited by 2 publications

(2 citation statements)

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“…Unbalanced structure, renewable distributed generation (DG) and energy storage system bring new difficulties in the analysis and computation. More accurate and efficient sensitivity analysis methods are required to facilitate the following control and optimization strategies [23]. In [23], a sensitivity analysis method for three-phase distribution networks considering the network loss and unbalanced parameters was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…More accurate and efficient sensitivity analysis methods are required to facilitate the following control and optimization strategies [23]. In [23], a sensitivity analysis method for three-phase distribution networks considering the network loss and unbalanced parameters was proposed. It can be applied to online power flow control requiring accurate real-time sensitivity results.…”

Section: Introductionmentioning

confidence: 99%

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Improved Correction Strategy for Power Flow Control Based on Multi-Machine Sensitivity Analysis

et al. 2020

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Sensitivity analysis is a conventional power grid analysis method that has been widely used in active power safety correction of power systems. This method relies on linearizing the power flow equation, assuming that the control variable change will continue to act on the power system until a new steady-state operating point is reached. However, this method ignores the quasi-steady-state physical response of power equipment to various control operations, which makes the method not suitable for real-time decision-making. Therefore, according to the improved equal and opposite quantity adjustment principle, this paper proposes a practical power flow correction control strategy, that can avoid repeated and inefficient adjustments of the system. In the proposed method, the single-machine sensitivity matrix under the AC power flow model is obtained based on the Taylor series expansion of the power flow equation. Subsequently, the multi-machine sensitivity with no dependence on the choice of the balancing machine is proposed considering the quasisteady-state method. The study is verified on a practical system, showing that the proposed method has an error of less than 1% with a rapid computation speed. The proposed method satisfies the requirements of real-time analysis and online control strategies, which can provide a more practical approach for active power safety correction.INDEX TERMS Real-time active power control strategy, multi-machine sensitivity, quasi-steady-state response, AC power flow model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%