Influence of Regulation of OLTC Transformation Ratio on Voltage Stability

Liu, Xiaoming; Niu, Xinsheng; Zhu, Yi; Zhu, Chunping

doi:10.1109/icdma.2013.165

Cited by 7 publications

(6 citation statements)

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“…The self-regulation of the ULTC transformation ratio is an important factor causing voltage instability. In fact, for different system operating conditions, different load types and different transformation ratios, the voltage-regulating effect may be different [48].…”

Section: Regulation Transformers (Under Load Tap Changers-ultcs)mentioning

confidence: 99%

Enhanced Contingency Analysis—A Power System Operator Tool

Bulat¹,

Franković

Vlahinić

2021

Energies

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Contingency analysis (CA) is a well-known function in power system planning and operation. In accordance with CA results, the system operator dispenses information regarding static security of the power system (overloads and/or voltage outside tolerable limits). However, classic CA with remedial action schemes cannot distinguish safe operating regimes from potentially dangerous ones in terms of voltage (in)stability. In fact, voltage instability is considered as one of the major threats leading to power system insecurity. Therefore, in this study an enhanced contingency analysis (ECA) is presented where the classical CA is extended with static voltage analysis based on the modal analysis. The article presents a dedicated methodology for the proposed ECA tool, with special emphasis on the analysis of corrective measures provided by the system operator, intended for enhancing power system security (regulation transformer action, distributed generation and energy storage). Also the influence of the load model was analyzed by simulation and the main conclusions are presented. The study demonstrated the advantages that distributed generation resources and energy storage can provide in the context of voltage stability. Also, the simulations acknowledged the importance of correct load modeling, since over or under estimation of a certain load-type component can result in too optimistic or too pessimistic power system operation limits.

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Section: Regulation Transformers (Under Load Tap Changers-ultcs)mentioning

confidence: 99%

Enhanced Contingency Analysis—A Power System Operator Tool

Bulat¹,

Franković

Vlahinić

2021

Energies

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“…where ω L, k and λ are the dual variables corresponding to constraints (40) and (41). The master problem can be simply shown as a minimisation problem…”

Section: Formulation Of the Master Problem Of The Benders Decompositimentioning

confidence: 99%

“…Although the distinct planning of transmission systems and reactive resources have been studied with many researches, to the best of authors knowledge, there is a lack of research to investigate the coordinated planning of a transmission system and reactive power resources, by considering the uncertainties of the system. In addition, it should be noted that, although the consideration of onload tap-changers will affect the voltage levels [40][41][42][43][44], for the sake of simplicity and without loss of the generality, such devices are not modelled in this paper. Hence, the main aim of this paper is to integrate the TNEP and RPP problems, in which, the planning of the reactive sources is modelled concurrently with the expansion planning of the transmission systems.…”

Section: Introductionmentioning

confidence: 99%

Flexible two‐stage robust model for moving the transmission and reactive power infrastructures expansion planning towards power system integration of renewables

Olfatinezhad¹,

Vahidinasab²,

Ahmadian³

et al. 2020

IET Renewable Power Generation

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This study proposes a two-stage robust optimisation framework to model uncertainties in construction cost, load and renewable power generations (RPGs) in the coordinated transmission and reactive power infrastructure expansion planning problem. The proposed planning model, based on the network AC model and its voltage constraints, is represented as a mixedinteger linear programing problem with the aim of minimising: (i) the construction costs of lines, (ii) installation cost of reactive power resources and (iii) active load shedding as RPGs curtailment. Using the suggested robust optimisation approach, the best expansion plan is obtained even in the worst case of the defined uncertainty sets and the plan robustness level is controlled via parameter definition for the individual uncertainty sets. The Benders decomposition algorithm is used to solve the two-stage problem where the plan security level is also taken into consideration using the N−1 contingency criterion. The standard Garver 6-bus system and the IEEE 24-bus reliability test system are used to validate the proposed robust framework.

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“…Three types of studies have been conducted for the voltage control problem of active distribution networks: on-load tap changer (OLTC) [3,4], energy storage participation [5,6], and rotary power flow controller (RPFC) [7,8] voltage regulation. In the literature [3,4], distribution network voltage control is achieved via OLTC. However, the OLTC approach exhibits the disadvantages of limited regulation capability, insufficient accuracy, and long regulation time.…”

Section: Introductionmentioning

confidence: 99%

Multiple-Zone Synchronous Voltage Regulation and Loss Reduction Optimization of Distribution Networks Based on a Dual Rotary Phase-Shifting Transformer

Shao,

Yan,

Yang

et al. 2024

Sustainability

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For the problem in which accessing a high proportion of renewable energy results in exceeding the limit in distribution network voltage, the existing regulating method experiences difficulty in considering the two-way voltage regulation and loss reduction optimization function. This study proposes a series-type dual rotary phase-shifting transformer (DRPST) based on the principle of phase volume synthesis. This transformer exhibits bidirectional voltage regulation, high reliability, and low cost. First, the topology, operating principle, and equivalent circuit of DRPST are introduced, and its simplified circuit model is established. On the basis of this model, the causes of voltage exceeding the limits are analyzed and the active distribution network model that contains DRPST is constructed. A real-time rolling two-layer optimization strategy based on DRPST is proposed. The inner layer model is solved using the multi-objective particle swarm optimization algorithm with the objective of minimizing voltage deviation and line loss. The optimal compromise solution of the Pareto solution set of the inner layer model is determined using the fuzzy subordinate degree function method. The outer model is based on the optimal compromise solution of the inner model, and the DRPST output rotor angle is controlled without deviation through double closed-loop proportional–integral regulation. Finally, the correctness and effectiveness of the proposed topology and control method are verified via simulation and experimental analysis.

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Influence of Regulation of OLTC Transformation Ratio on Voltage Stability

Cited by 7 publications

References 0 publications

Enhanced Contingency Analysis—A Power System Operator Tool

Enhanced Contingency Analysis—A Power System Operator Tool

Flexible two‐stage robust model for moving the transmission and reactive power infrastructures expansion planning towards power system integration of renewables

Multiple-Zone Synchronous Voltage Regulation and Loss Reduction Optimization of Distribution Networks Based on a Dual Rotary Phase-Shifting Transformer

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