Coordinative real‐time sub‐transmission volt–var control for reactive power regulation between transmission and distribution systems

Ke, Xinda; Samaan, Nader; Holzer, Jesse; Huang, Renke; Vyakaranam, Bharat; Vallem, Mallikarjuna R.; Elizondo, Marcelo; Liu, Ning; Zhu, Xiangqi; Werts, Brant; Nguyen, Quan; Huang, Alex Q.; Makarov, Yuri V.

doi:10.1049/iet-gtd.2018.5850

Cited by 24 publications

(16 citation statements)

References 25 publications

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“…Therefore, it is important to derive the required reactive power by learning the situation in which the voltage will change for an event such as a specific accident or output change in an offline manner, and accordingly, an appropriate setting of the dead band value contributes to maintaining the voltage range. The required reactive power Q req can be calculated using Equation (11), which indicates the relationship between the change in voltage magnitude and that in the reactive power obtained through voltage sensitivity analysis, and the values of the reference voltage and measured voltage, V POI,re f and V POI,mea , at the POI.…”

Section: Proposed Reactive Power-voltage Droop Control Methodsmentioning

confidence: 99%

“…The integration of a DG with high variability in a conventional network may create a voltage problem [7,8]. Regarding voltage regulation in transmission systems, several coordination strategies have been proposed so far, which can be classified into two groups: (1) coordinated control between DGs and reactive power compensation facilities, such as a flexible AC transmission system (FACTS) [9,10], and (2) supplementary control functions, which have been implemented for DGs to use the advanced reactive power-voltage control method [11][12][13]. To achieve advanced control ability, previous studies have focused on decentralized and centralized control strategies [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Droop Control Strategy of Utility-Scale Photovoltaic Systems Using Adaptive Dead Band

2020

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This paper proposes a novel droop control strategy for addressing the voltage problem against disturbance in a transmission system connected with a utility-scale photovoltaic. Typically, a voltage control at the renewable energy sources (RESs) connected to the transmission grid uses a reactive power–voltage control scheme with a fixed dead band. However, this may cause some problems; thus, this paper proposes a method for setting a dead band value that varies with time. Here, a method for calculating an appropriate dead band that satisfies the voltage maintenance standard for two disturbances is described using voltage sensitivity analysis and the equation of existing droop control. Simulation studies are conducted using the PSS® E program to analyze the short term voltage stability and display the results for various dead bands. The proposed modeling and operational strategy are validated in simulation using a modified IEEE 39 bus system. The results provide useful information, indicating that the control scheme through an adaptive dead band enables more stable system operation than that through a fixed dead band.

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Section: Proposed Reactive Power-voltage Droop Control Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Droop Control Strategy of Utility-Scale Photovoltaic Systems Using Adaptive Dead Band

2020

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“…The objective function f (u, t, p G , q G , p f , q f , p t , q t , v) in (1a) may represent any objective function related to the ORPD problem: power loss, voltage deviation, number of control actions, generation cost, etc. Some of them are considered in [27]. We note that power loss is a widely used objective function for the ORPD problem.…”

Section: Orpd: Formulationmentioning

confidence: 99%

Tight-and-Cheap Conic Relaxation for the Optimal Reactive Power Dispatch Problem

Bingane

Anjos

Digabel

2019

IEEE Trans. Power Syst.

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The optimal reactive power dispatch (ORPD) problem is an alternating current optimal power flow (ACOPF) problem where discrete control devices for regulating the reactive power, such as shunt elements and tap changers, are considered. The ORPD problem is modelled as a mixed-integer nonlinear optimization problem and its complexity is increased compared to the ACOPF problem, which is highly nonconvex and generally hard to solve. Recently, convex relaxations of the ACOPF problem have attracted a significant interest since they can lead to global optimality. We propose a tight conic relaxation of the ORPD problem and show that a round-off technique applied with this relaxation leads to near-global optimal solutions with very small guaranteed optimality gaps, unlike with the nonconvex continuous relaxation. We report computational results on selected MATPOWER test cases with up to 3375 buses.

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“…For instance, distribution networks may also need to combine day-ahead scheduling with real-time dispatch [10] as in transmission. Besides, some authors point out that coordinated actions between both operators would allow to achieve effective and efficient voltage control and congestion management [11] as well as regulate active and reactive power exchange at frontier nodes [12,13] to guarantee security, reliability, and cost-efficiency. However, the high number of DRES, which may be spread, pose a challenge to traditional systems [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Formulation to Compute Sensitivities to Solve Congestions and Voltage Problems in Active Distribution Networks

2021

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Sensitivities are broadly appreciated because of its simplicity and good results in solving voltage problems and congestions in transmission networks. However, since sensitivity calculation is based on a linear approximation of the power flow equations, all decisions commit an intrinsic error that might lead into unexpected results, especially in distribution networks. This paper analyzes the error associated to sensitivities considering a wide range of control variables and proposes a novel formulation to extend the use of sensitivities to manage congestions in active distribution networks. First, a theoretical analysis is performed to study the origin and propagation of errors. Then, numerical results are presented for two types of distribution networks (20 kV and low voltage grids). Finally, a novel formulation is proposed to extend the use of sensitivities to manage congestions, which will allow to reuse previous sensitivity-based methodologies to solve both voltage problems and congestions in active distribution networks.

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Coordinative real‐time sub‐transmission volt–var control for reactive power regulation between transmission and distribution systems

Cited by 24 publications

References 25 publications

Droop Control Strategy of Utility-Scale Photovoltaic Systems Using Adaptive Dead Band

Droop Control Strategy of Utility-Scale Photovoltaic Systems Using Adaptive Dead Band

Tight-and-Cheap Conic Relaxation for the Optimal Reactive Power Dispatch Problem

A Novel Formulation to Compute Sensitivities to Solve Congestions and Voltage Problems in Active Distribution Networks

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