Stochastic Optimization of PQ Powers at the Interface between Distribution and Transmission Grids

Buire, Jerome; Colas, Frédéric; Dieulot, Jean-Yves; Guillaud, Xavier

doi:10.3390/en12214057

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…In [8], a rule-based central controller is calculating the reactive power compensation level from Distributed Generators (DG), to which level the DG comply according to their capabilities. In [9], a two-stage optimisation method is employed for controlling both voltage levels and reactive power exchange. The tap positions of capacitor banks are optimised on a daily basis, and reactive power support from DG on an hourly basis.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Overall, the proposed methodologies can be divided into those that have as an objective to minimise deviations from set-points [4,6,7] and those that have as a constraint to keep the reactive power exchange within certain limits [5,8,9]. This paper falls in the second category, and its objective is to keep reactive power exchange between transmission and distribution grids within the limits specified by the TSO.…”

Section: Literature Reviewmentioning

confidence: 99%

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Compliance of Distribution System Reactive Flows with Transmission System Requirements

et al. 2021

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Transmission system operators (TSOs) often set requirements to distribution system operators (DSOs) regarding the exchange of reactive power on the interface between the two parts of the system they operate, typically High Voltage and Medium Voltage. The presence of increasing amounts of Distributed Energy Resources (DERs) at the distribution networks complicates the problem, but provides control opportunities in order to keep the exchange within the prescribed limits. Typical DER control methods, such as constant cosϕ or Q/V functions, cannot adequately address these limits, while power electronics interfaced DERs provide to DSOs reactive power control capabilities for complying more effectively with TSO requirements. This paper proposes an optimisation method to provide power set-points to DERs in order to control the hourly reactive power exchanges with the transmission network. The method is tested via simulations using real data from the distribution substation at the Sundom Smart Grid, in Finland, using the operating guidelines imposed by the Finnish TSO. Results show the advantages of the proposed method compared to traditional methods for reactive power compensation from DERs. The application of more advanced Model Predictive Control techniques is further explored.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Compliance of Distribution System Reactive Flows with Transmission System Requirements

et al. 2021

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“…The decision phase is an approximation based on the off-line sampling. The paper [10] presents a controller which ensures that the power at the high-voltage/medium-voltage interface remains within specified active and reactive power limits. The algorithm uses a linear power flow and assumes that power consumptions and productions are Gaussian variables.…”

Section: Literature Reviewmentioning

confidence: 99%

Short-term active distribution network operation under uncertainty

Mathieu

Ernst

Gemine³

2020

2020 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)

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Electrical distribution systems need to integrate more and more renewable energy generation in their network. Since networks cannot be quickly upgraded at a low cost, new generators are connected to the network under non-firm access contracts. These contracts allow distribution system operators to specify dynamic access limits according to a given regulatory policy, e.g. "last-in, first-out" or a similar policy. Due to operational delays, access limits must be communicated before realtime, e.g. ten minutes ahead. This paper presents an operational method to compute these dynamic access limits using correlated probabilistic forecasts of power consumption and production processes. The method is illustrated on a test-case based on real data where no additional production would be allowed under firm access. Results show that the method allows to safely integrate additional production capacity while limiting congestion events, provided that efficient probabilistic forecasts able to anticipate sudden and important changes are available.

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“…Several studies have investigated the reactive power exchange at the transmission-distribution interface, but, in most of the cases, they were focused on the problem only from the DNO"s point of view, considering stiff voltages in the TSO grid and pre-defined ranges of reactive power exchange. In [7], a two-stage optimization routine is developed to tune controllers such that the power confidence levels at the HV/MV interface remain within specified limits. In [8], the author proposes two-time scales to schedule the planning and to perform the operational optimization of interface powers considering uncertainties.…”

Section: Introductionmentioning

confidence: 99%

MPC Based Centralized Voltage and Reactive Power Control for Active Distribution Networks

Nguyen

Rueda

Leki

et al. 2021

IEEE Trans. Energy Convers.

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The paper presents an approach for online centralized control in active distribution networks. It combines a proportional integral (PI) control unit with a corrective control unit (CCU), based on the principle of Model Predictive Control (MPC). The proposed controller is designed to accommodate the increasing penetration of distributed generation in active distribution networks. It helps in continuously satisfying the reactive power requirements of the transmission system operators (TSOs), while maintaining an acceptable voltage profile in the active distribution network, and simultaneously minimizing the total active power losses. The controller also ensures compliance to operation requirements of distribution network operators (DNOs). By replacing the full load flow (LF) calculation with sensitivities, derived from a linearized model of the network, the controller can work in real-time applications. Moreover, the computational burden of the proposed controller is reduced since the CCU is activated only when a voltage violation or considerable change of operation condition occurs. The performance of the proposed controller is demonstrated on a 11-kV test network with 75 buses and 22 distributed generators.

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Stochastic Optimization of PQ Powers at the Interface between Distribution and Transmission Grids

Cited by 4 publications

References 19 publications

Compliance of Distribution System Reactive Flows with Transmission System Requirements

Compliance of Distribution System Reactive Flows with Transmission System Requirements

Short-term active distribution network operation under uncertainty

MPC Based Centralized Voltage and Reactive Power Control for Active Distribution Networks

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