LV Measurement Device Placement for Load Flow Analysis in MV Smart Grids

Cataliotti, Antonio; Cosentino, Valentina; Cara, Dario Di; Tinè, Giovanni

doi:10.1109/tim.2015.2494618

Cited by 46 publications

(29 citation statements)

References 25 publications

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“…To validate the proposed IHMP method, in the simulation study it was compared to that used in [24], showing how the new approach allows the reduction of uncertainties obtained in most of the branches. To perform the aforesaid comparison, the same reference load condition was used, which The B/F load flow algorithm is based on a recursive procedure: starting from the measured load powers, the algorithm iteratively updates branch power flows and node voltages using backward and forward sweeps on the network, respectively.…”

Section: Real Case Study Network and Simulation Resultsmentioning

confidence: 99%

Section: Real Case Study Network and Simulation Resultsmentioning

confidence: 99%

“…The IHMP method was tested in a real 25-bus MV radial distribution network. To validate the IHMP method's effectiveness, it is compared to that used in [24]; differently from [24], where the MP strategy was developed to minimize the uncertainty in power flow estimations at MV slack bus, the IHMP method aims at reducing the mean value of uncertainty in all MV branches by properly adding new PMs to existing ones. The obtained results show that the IHMP approach allows a significant reduction of uncertainties in most of the MV branches.…”

Section: Introductionmentioning

confidence: 99%

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Incremental Heuristic Approach for Meter Placement in Radial Distribution Systems

et al. 2019

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The evolution of modern power distribution systems into smart grids requires the development of dedicated state estimation (SE) algorithms for real-time identification of the overall system state variables. This paper proposes a strategy to evaluate the minimum number and best position of power injection meters in radial distribution systems for SE purposes. Measurement points are identified with the aim of reducing uncertainty in branch power flow estimations. An incremental heuristic meter placement (IHMP) approach is proposed to select the locations and total number of power measurements. The meter placement procedure was implemented for a backward/forward load flow algorithm proposed by the authors, which allows the evaluation of medium-voltage power flows starting from low-voltage load measurements. This allows the reduction of the overall costs of measurement equipment and setup. The IHMP method was tested in the real 25-bus medium-voltage (MV) radial distribution network of the Island of Ustica (Mediterranean Sea). The proposed method is useful both for finding the best measurement configuration in a new distribution network and also for implementing an incremental enhancement of an existing measurement configuration, reaching a good tradeoff between instrumentation costs and measurement uncertainty.

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Section: Real Case Study Network and Simulation Resultsmentioning

confidence: 99%

Section: Real Case Study Network and Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Incremental Heuristic Approach for Meter Placement in Radial Distribution Systems

et al. 2019

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“…The other is for the optimal dispatch of each generating unit to minimize the total cost of the power generation satisfying load demand and TL. In this paper, the Newton-Raphson method is used for solving the power flow equations in the traditional power flow-based ED (TPF-ED), and the TPF-ED is the exact solution in ED problem; however, it is based on the correct input data for the power flow calculation; thus, measurement device placement algorithms [29][30][31] are able to overcome the uncertainties of field data and network parameters for power flow calculation in practical applications. The IEEE 14-bus and 30-bus test systems are employed as sample systems to verify the accuracy and effectiveness of the proposed loss model as shown in Figures 4 and 5, respectively.…”

Section: Discussion Of the Simulation Resultsmentioning

confidence: 99%

Derivation and Application of a New Transmission Loss Formula for Power System Economic Dispatch

et al. 2018

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Abstract:The expression and calculation of transmission loss (TL) play key roles for solving the power system economic dispatch (ED) problem. ED including TL must compute the total TL and incremental transmission loss (ITL) by executing power flow equations. However, solving the power flow equations is time-consuming and may result in divergence by the iteration procedure. This approach is unsuitable for real-time ED in practical power systems. To avoid solving nonlinear power flow equations, most power companies continue to adopt the TL formula in ED. Traditional loss formulas are composed of network parameters and in terms of the generator's real power outputs. These formulas are derived by several assumptions, but these basic assumptions sacrifice accuracy. In this study, a new expression for the loss formula is proposed to improve the shortcomings of traditional loss formulas. The coefficients in the new loss formula can be obtained by recording the power losses according to varying real and reactive power outputs without any assumptions. The simultaneous equations of the second-order expansion of the Taylor series are then established. Finally, the corresponding coefficients can be calculated by solving the simultaneous equations. These new coefficients can be used in optimal real and reactive power dispatch problems. The proposed approach is tested by IEEE 14-bus and 30-bus systems, and the results are compared with those obtained from the traditional B coefficient method and the load flow method. The numerical results show that the proposed new loss formula for ED can hold high accuracy for different loading conditions and is very suitable for real-time applications.

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“…The advance dispatch operates in the framework of a short time, such as 30 min [17]. The shorter time-scale can be state estimation, which contains load power measurement, estimation, and dispatching [19][20][21][22][23]. In order to deal with the problems of renewable energies connected to the power grid and the ramping constraints of generators, there are studies focusing on the dispatch from the perspective of time dimension.…”

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confidence: 99%

Sample Entropy Based Net Load Tracing Dispatch of New Energy Power System

Peng

Gao

et al. 2019

Energies

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The high-proportion of renewable energies is gradually becoming one of the main power supply sources and bringing strong uncertainties to the power grid. In this paper, a sample entropy (SampEn) based net load tracing dispatch strategy with a specific thermal generating mode is proposed. In this strategy, renewable energies are fully and preferentially consumed by electric loads, turned to net loads, to maximize the utilization of renewable energies. SampEn theory is utilized to evaluate the complexity of net load time series, based on which, the traditional power generators trace the complexity of the net load flexibly. According to the SampEn, a specific generating model of thermal generators is determined and the cooperation between thermal generators and pumped storage is realized, aiming at reducing the ramp power of thermal generators and increasing the throughput of pumped storage. The experiment simulation is developed on the 10-unit test system. Results show that the ramping power of the thermal generators are reduced 43% and 13% in the two cases together with the throughput of pumped storage is increased 44% and 27% on the premise that the economy of the system is maintained and renewable energies are fully consumed. Therefore, the efficiency and reasonability of the proposed dispatch strategy are confirmed.Energies 2019, 12, 193 2 of 23 the imbalance between electric loads and intermittent power energies. In this way, the source-load bilateral uncertainty problem is transformed to how to respond to the uncertainty of net loads.There are many studies focusing on the power balancing problems related to high-proportion renewable energies connected to the power grid. The multi-source coordination of power systems is an effective means. The flexible resources such as hydropower plant, gas turbine power plant, energy storage, and so forth are developed and utilized to respond to the uncertainty and fluctuation of renewable energies cooperatively [9,10]. In [10], a robust unit commitment model considering the cooperation of wind power and pumped storage is proposed, in which the wind power fluctuation is restrained by the pumped storage. Reference [11] utilized the second life battery energy storage to assist thermal generators to respond to the fluctuation of renewable energies. Facing the high-percentage renewable energies, the ramp capability of generators is an important factor when to response to the load demands [12][13][14]. It is argued in [15] that the insufficient ramp resources in the system may lead to the insufficient flexibility to meet variations in the net loads. Reference [16] estimated the potential variability of net loads by the statistical approaches on the ramping characteristics to determine the required ramping capability in the future. The increasing ramping capability can improve the flexibility on supply side. However, the above studies are based on the traditional power dispatch. With the increasing of renewable energies percentage, the amplitude and frequency of generating and ram...

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LV Measurement Device Placement for Load Flow Analysis in MV Smart Grids

Cited by 46 publications

References 25 publications

Incremental Heuristic Approach for Meter Placement in Radial Distribution Systems

Incremental Heuristic Approach for Meter Placement in Radial Distribution Systems

Derivation and Application of a New Transmission Loss Formula for Power System Economic Dispatch

Sample Entropy Based Net Load Tracing Dispatch of New Energy Power System

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