??? by PAULO M DE OLIVEIRA-DE JESUS
—In this paper, the remuneration of fixed costs of distribution networks with distributed generat... more —In this paper, the remuneration of fixed costs of distribution networks with distributed generation is evaluated by means of an efficient planning strategy that includes the concept of fuzzy robustness of a given solution plan. As a key contribution, it is included the possibility of choice among different conductor sizes. In order to assess the fixed costs to be remunerated at long term, a single-stage multicriteria planning problem is solved using three different criteria: initial investment cost, power losses cost and reliability cost. Pareto or efficient plans are identified using the ε-constraint method jointly with a large-scale commercial package able to deal with Mixed-Integer Linear Programming (MILP). Uncertainty associated to load demand and power injections of distributed resources are integrated using a fuzzy power flow in order to obtain the robustness indexes of each Pareto solution. The annualized fixed charge rate (AFCR) associated to new and existing distribution lines at given voltage level is assessed through a with-without analysis permitting to compute the Annual Avoided Charge Rate (AACR). When avoided or deferral investments are verified, the benefits of DG connection can be transferred to consumers as reduction in base rate and to generators as localization incentive. 1
—A new method for distribution access via uniform pricing for the remuneration of distribution ne... more —A new method for distribution access via uniform pricing for the remuneration of distribution networks is presented. The proposed approach merges in a unified framework the investments , the optimal network operation requirements, the effect of the price elasticity of demand, and the application of hourly pricing for demand side management purposes. Hourly uniform marginal prices—understood as tariffs of use of the network—are obtained from maximum social welfare condition sending efficient signals to the utility and consumers, related to the optimal operation of the grid and use of the energy at peak and valley hours. This method is used in the context of a Performance Based Ratemaking regulation to get model companies from operational optimized real networks. Capital fees are integrated in the marginal tariff of use, by means of the New Replacement Value concept, broadly used in yardstick competition. The model is stated as a mixed-integer linear optimization problem suitable to be solved through well-known linear programming tools. The methodology has been successfully tested in a 42-bus test distribution network.
This paper presents a new load flow formulation to solve active and passive electric distribution... more This paper presents a new load flow formulation to solve active and passive electric distribution networks. The fundamental idea discussed here is how to obtain the power flow solution by using the elements of a unique quasi-symmetric matrix called TRX in the iterative process. The method is formulated for singlephase balanced and three-phase unbalanced radially operated networks. It works with real variables as opposed to complex variables used in previous backward/forward sweep algorithms discussed in literature. The proposed TRX matrix constitutes a complete database by including information of network topology structure as well as branch impedances of the distribution feeder. Data arrangement is suitable to be exchanged under standard Common Information Model (CIM) under Distribution Management Systems (DMS) environment allowing an efficient computation of the state of the system for on-line and off-line study applications. The proposed methodology was applied on a group of IEEE test systems and a real distribution system of 49,000 nodes.
—This paper presents a novel formulation of the Distribution System State Estimation (DSSE) optim... more —This paper presents a novel formulation of the Distribution System State Estimation (DSSE) optimization model. For a given electric three-phase circuit feeder, network models are built using a quasi-symmetric impedance matrix TRX representing the entire structure and topology of the radial network. As a key contribution , the state variables of demands and generators connected to large-scale distribution grids are obtained by using a convenient matrix reduction technique. As a result, the size of the optimization problem is considerably reduced with respect to the jacobian formulation by considering radial and weakly meshed exploitation and elimination of interconnecting nodes. Results and comparative analysis are presented using the IEEE 4-, 13-, 37-, 123-, and 8500-node test systems.
In this paper a two level hierarchical methodology is presented for the integral design of hybrid... more In this paper a two level hierarchical methodology is presented for the integral design of hybrid power generation systems based on alternative renewable energy (ARE) systems using the net energy concept and considering technical, economical, societal as well as environmental aspects. Results are presented for the design of a small-scale hybrid renewable energy system using the proposed methodology in Margarita Island, Venezuela. The proposed methodology applies the integrated analytical hierarchy process (AHP) methodology to the selection of the best hybrid renewable energy system using the concept of net energy and is divided in two phases: a classic optimization process using levelized costs minimization and an AHP implementation for decision making problems. Under this methodology technical–economical aspects are considered as quantitative parameters, while social–environmental aspects depend largely on the criteria of the system planning engineers and future users of the system. Technical–economical aspects are considered using specialized software, used to optimize and compute the best configuration of an ARE project. Social–economical aspects are defined as a series of parameters that should be considered by the planning team, a meeting of experts or a community consensus on the project site. Several diesel price scenarios (low, intermediate and high) are considered. The results show the importance of the proposed tools for decision making problems.
Unbalanced Power Flow Analysis in Distribution Systems Using TRX Matrix: Implementation Using DIgSILENT Programming Language
Power Systems, 2014
ABSTRACT
International Journal of Global Energy Issues, 2007
This paper discusses an integrated framework for cost allocation of energy losses of electric dis... more This paper discusses an integrated framework for cost allocation of energy losses of electric distribution systems under liberalised energy markets.
Estimation of Equivalent Model for Cluster of Induction Generator Based on PMU Measurements
Power Systems, 2014
ABSTRACT The induction generator (IG) is widely used in many applications due to its simplicity a... more ABSTRACT The induction generator (IG) is widely used in many applications due to its simplicity and ease of operation. Typical applications involve the following: split-shaft micro-turbines (SSMT), mini-hydro (MH), and fixed-speed wind turbines (FSWT). The accurate knowledge of the machine parameters is especially important in order to establish the performance of the IG as well as to directly affect its operational and control characteristics. The problem of IG parameter estimation results specially complicated to solve when a cluster of IG is interconnected to create of virtual power plant (VPP). Then, it is desirable to have an effective method to estimate the parameters of an equivalent model for a cluster of IG (which does not require detailed definition of the power plant structure and parameters) by using novel digital measurement equipment such as phasor measurement units (PMU) in transmission and distribution networks. This chapter presents a method for the estimation of an equivalent model (named as EqMCIG App) for a cluster of IG, based on the response to a system frequency disturbance. The performance and robustness of the method are evaluated using two different test systems where the EqMCIG is identified using the variable metric method (VMM). Numerical results demonstrate the viewpoint and effectiveness of the proposed methodology. This chapter have three main contributions: (i) Performing “parameter estimation” using ComIdent command (ii) The use of DSL model on model parameter identification (composite Frame, block definition—BlkDef) (iii) Use of a “Measurement File” object (ElmFile) as inputs variables.
Papers by PAULO M DE OLIVEIRA-DE JESUS
Methodology for selecting assessment periods of Logarithmic Mean Divisia Index decomposition techniques
Energy Strategy Reviews
Sustainability
This paper presents the application of the Logarithmic Mean Divisia Index Decomposition Analysis ... more This paper presents the application of the Logarithmic Mean Divisia Index Decomposition Analysis (LMDI) to the aggregate carbon intensity (ACI) of the power sector in Colombia in the period 1990–2020, with the aim of identifying the main drivers influencing the ACI change. The analysis performed identifies the main drivers among: carbon intensity, generation efficiency, and contribution of fossil generation at the specific and total level of electricity production. The analysis is performed at the aggregate and disaggregated level of fossil fuels. Due to the highly variable behavior of the ACI, a multi-temporal decomposition is performed in the eight presidential administrations in the period of analysis. For each period, the main drivers are identified and the energy policy implications and their effects on the operation and management of the power sector are analyzed. The results show that the main driver is the fossil share of total energy production. Important effects on thermal...
Impacto de las políticas nacionales de inversión en eficiencia energética, integración de tecnologías limpias y redes inteligentes en la matriz energética eléctrica y la reducción de las emisiones de CO2 del sector eléctrico de América Latina y el Caribe
A Clustering Approach for Domestic Smart Metering Data Preprocessing
2018 IEEE ANDESCON, 2018
The widespread application of smart metering will lead to a huge increase of amounts of data into... more The widespread application of smart metering will lead to a huge increase of amounts of data into electricity utilities. As the Automatic Metering Infrastructure (AMI) is being deployed in countries such as Colombia, problems with data acquisition have arisen, including data loss, and data transmission and storage errors. In these cases, descriptive statistics are not suitable if aggregation processes are conducted. In this paper, we propose a segmentation method based on the K-means algorithm to effectively identify and remove anomalous information in domestic smart metering data. This method aims to characterize the pattern of electricity use for each consumer stratum and location, and to preprocess the data for its subsequent analysis. For this purpose, an open-source library based on the software environment R was developed to standardize smart metering data, to conduct a statistical analysis, and to correlate consumption patterns with geographical information. A study case is discussed with annual data acquired from 6060 smart meters located in city of Bogotá, Colombia, where outliers are identified over a pre-filtered data set encompassing average real power measurements along a four-month period. We show that our method is able to characterize patterns of consumption among the predefined user strata and locations in Bogotá to successfully identify and remove anomalous data for a subsequent statistical and geographical analysis.
Electric Power Components and Systems, 2018
Renewable and Sustainable Energy Reviews, 2019
Logarithmic mean Divisia for index decomposition analysis (IDA-LMDI) has been applied to evaluate... more Logarithmic mean Divisia for index decomposition analysis (IDA-LMDI) has been applied to evaluate the aggregate carbon emission intensity of electricity (ACI) evolution considering explaining factors as fuel mix, thermal efficiency, fossil share and geographical effects. However, the capacity factor of the generation system has not been duly considered in previous LMDI formulations. The capacity factor provides a perception of the time of use of the generation infrastructure. Despite LMDI analysis have been widely applied to explain the electricity-related CO 2 emissions changes in many countries and regions of the world, Latin America & the Caribbean (LAC) power sector has not been analyzed yet. Since 1990 the global ACI declined around 5% whereas the ACI of LAC is just going in the opposite direction with a significant increase of 10%. To fill the research gap, this paper presents a new and general temporal IDA-LMDI formulation in order to expressly include the effect of capacity factors and analyze the evolution of LAC's ACI between 1990 and 2015. Results reveal the increase of the ACI in the region is due to structural reasons, mainly in Brazil. Intensity factors as thermal efficiency and fossil mix were also substantially improved, mainly in Mexico, but not enough to cut down the regional ACI increase. As a key result, it is shown that the capacity factors of fossil-based generation-mainly in Venezuela, Mexico and Brazil-are a relevant driving force behind the ACI increase. As Brazil is the largest producer and its capacity factor is relatively low compared to other LAC countries, the increasingly dispatch of fuel-fired power plants to cover base-load may boost the ACI of the region in the future jeopardizing the compliance of the climate goals.
Distribution System State Estimation Model Using a Reduced Quasi-Symmetric Impedance Matrix
IEEE Transactions on Power Systems, 2015
ABSTRACT
Electric Power Systems Research, 2013
This paper presents a new load flow formulation to solve active and passive electric distribution... more This paper presents a new load flow formulation to solve active and passive electric distribution networks. The fundamental idea discussed here is how to obtain the power flow solution by using the elements of a unique quasi-symmetric matrix called TRX in the iterative process. The method is formulated for singlephase balanced and three-phase unbalanced radially operated networks. It works with real variables as opposed to complex variables used in previous backward/forward sweep algorithms discussed in literature. The proposed TRX matrix constitutes a complete database by including information of network topology structure as well as branch impedances of the distribution feeder. Data arrangement is suitable to be exchanged under standard Common Information Model (CIM) under Distribution Management Systems (DMS) environment allowing an efficient computation of the state of the system for on-line and off-line study applications. The proposed methodology was applied on a group of IEEE test systems and a real distribution system of 49,000 nodes.
2006 International Conference on Probabilistic Methods Applied to Power Systems, 2006
In this paper, the remuneration of fixed costs of distribution networks with distributed generati... more In this paper, the remuneration of fixed costs of distribution networks with distributed generation is evaluated by means of an efficient planning strategy that includes the concept of fuzzy robustness of a given solution plan. As a key contribution, it is included the possibility of choice among different conductor sizes. In order to assess the fixed costs to be remunerated at long term, a single-stage multicriteria planning problem is solved using three different criteria: initial investment cost, power losses cost and reliability cost. Pareto or efficient plans are identified using the constraint method jointly with a large-scale commercial package able to deal with mixed-integer linear programming (MILP). Uncertainty associated to load demand and power injections of distributed resources are integrated using a fuzzy power flow in order to obtain the robustness indexes of each Pareto solution. The annualized fixed charge rate (AFCR) associated to new and existing distribution lines at given voltage level is assessed through a with-without analysis permitting to compute the annual avoided charge rate (AACR). When avoided or deferral investments are verified, the benefits of DG connection can be transferred to consumers as reduction in base rate and to generators as localization incentive Index Terms Inspec Controlled Indexing distributed power generation fuzzy logic integer programming investment linear programming load flow power distribution economics power distribution planning Non-controlled Indexing AACR AFCR MILP Pareto solution annual avoided charge rate annualized fixed charge rate distributed generation distribution lines distribution network remuneration fuzzy multicriteria planning investment cost mixed-integer linear programming power flow Author Keywords access pricing dispersed generation distributed generation embedded generation pricing regulation References No references available on IEEE Xplore. Citing Documents No citing documents available on IEEE Xplore.
IEEE Transactions on Power Systems, 2005
A new method for distribution access via uniform pricing for the remuneration of distribution net... more A new method for distribution access via uniform pricing for the remuneration of distribution networks is presented. The proposed approach merges in a unified framework the investments, the optimal network operation requirements, the effect of the price elasticity of demand, and the application of hourly pricing for demand side management purposes. Hourly uniform marginal prices-understood as tariffs of use of the network-are obtained from maximum social welfare condition sending efficient signals to the utility and consumers, related to the optimal operation of the grid and use of the energy at peak and valley hours. This method is used in the context of a Performance Based Ratemaking regulation to get model companies from operational optimized real networks. Capital fees are integrated in the marginal tariff of use, by means of the New Replacement Value concept, broadly used in yardstick competition. The model is stated as a mixed-integer linear optimization problem suitable to be solved through well-known linear programming tools. The methodology has been successfully tested in a 42-bus test distribution network. Index Terms-Distribution access pricing, power system economics, tariffs of use, yardstick competition. I. INTRODUCTION T HE REGULATION of the electrical distribution activity based in the traditional paradigm of the Cost of Service/Rate of Return relation (CoS/RoR) engrosses or merges two distinct activities in the distribution function: distribution and retailing. The distribution utility is considered as a natural monopoly and end-user tariffs designs are usually based on the independent application of capacity and energy charges to deal with well-known revenue reconciliation problem [1]. Other types of regulation such as performance based ratemaking (PBR), have been applied in order to incentive distribution companies to be more efficient [2]. The distribution network activity remains considered as a natural monopoly and the retailing activity is open to the market. Different regulation schemes for distribution utilities as price caps, revenue caps, and yardstick competition have been developed and applied Manuscript
A hierarchical methodology for the integral net energy design of small-scale hybrid renewable energy systems
Renewable and Sustainable Energy Reviews, 2015
ABSTRACT In this paper a two level hierarchical methodology is presented for the integral design ... more ABSTRACT In this paper a two level hierarchical methodology is presented for the integral design of hybrid power generation systems based on alternative renewable energy (ARE) systems using the net energy concept and considering technical, economical, societal as well as environmental aspects. Results are presented for the design of a small-scale hybrid renewable energy system using the proposed methodology in Margarita Island, Venezuela. The proposed methodology applies the integrated analytical hierarchy process (AHP) methodology to the selection of the best hybrid renewable energy system using the concept of net energy and is divided in two phases: a classic optimization process using levelized costs minimization and an AHP implementation for decision making problems. Under this methodology technical–economical aspects are considered as quantitative parameters, while social–environmental aspects depend largely on the criteria of the system planning engineers and future users of the system. Technical–economical aspects are considered using specialized software, used to optimize and compute the best configuration of an ARE project. Social–economical aspects are defined as a series of parameters that should be considered by the planning team, a meeting of experts or a community consensus on the project site. Several diesel price scenarios (low, intermediate and high) are considered. The results show the importance of the proposed tools for decision making problems.
PMU-based system state estimation for multigrounded distribution systems
IEEE Transactions on Power Systems
Linear network modeling and phasor measurement units (PMUs) simplify the traditional system state... more Linear network modeling and phasor measurement units (PMUs) simplify the traditional system state estimation (SSE) problem. The existing multiphase SSE-PMU-based models are linear including earthing resistances as a fixed and invariable parameter. However, earthing resistances strongly depend on moisture and temperature changes over time. Thus, under unbalanced operation time-varying Neutral-Earth Voltages (NEV) could be higher than admisible touch and step voltages in urban areas. Earthing resistances can be now monitored using specialized meters and therefore duly incorporated as measured and state variables in a multigrounded SSE problem. Thus, the SSE problem becomes non-linear and the standard linear solution approach is no longer suitable. This fact has been overlooked in the literature. To fulfill the research gap, a new multi-grounded SSE-PMU-based formulation is presented. As a key contribution, the normal-equation structure used in linear SSE approaches was extended to a non-linear one in order to allow the estimation of grounding resistances, neutral-to-earth voltages, and neutral currents. The proposal was applied in a 2-bus example for illustration purposes and successfully applied and compared with existing methods under large-scale conditions.
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??? by PAULO M DE OLIVEIRA-DE JESUS
Papers by PAULO M DE OLIVEIRA-DE JESUS