Archive for the ‘Optimization’ Category


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microgrids and applications uni symposion electrical engineering pes ieee nov 2016

Cordialmente invitados a mi conferencia hoy miércoles 23 de noviembre desde las 5:45 pm a 6:45 pm en el Auditorio de la Facultad de Ingeniería Eléctrica y Electrónica de la Universidad Nacional de Ingeniería (ingreso por la puerta 5 de la universidad). Esta ponencia lo doy en el marco del VII Simposio de Ingeniería Eléctrica dedicado a las Energías Renovables organizado por la Sección PES de la Rama IEEE de la Universidad Nacional de Ingeniería de Perú. Desde la necesidad energética mundial, los recursos renovables, el cambio climático, los sistemas eléctricos avanzados, las microredes son tratados para terminar la exposición con mostrar al auditorio detalles de la investigación sobre interconexión entre microredes de corriente continua.

PD: Si alguien desea grabar la conferencia, favor me avisa para luego subirlo a YouTube.


Los sistemas eléctricos en el futuro próximo cercano van a tener que ser inteligentes por obligación competitiva entre empresas eléctricas a fin de optimizar y mejorar sus prestaciones, esto sumado a la implementación de tecnologías de energías renovables, generación distribuida, entre otras. En especial énfasis la distribución dado que promueve los activos de generación. Ante ello un nuevo marco de transmisión y distribución se hace necesario en muchos países, siendo el marco regulativo de distribución el de mayor desafío. Incluyendo la interacción con los clientes, los cuales son más activos ahora, por ejemplo, ahora se tiene que si llaman varios clientes de una misma zona se deduce que se tiene una falla. Siendo ahora cada vez más importante en la vida diaria de las personas y las industrias se requiere cambios de índices de continuidad de suministro (1) continuidad, cantidad y tiempo de cortes, (2) calidad del producto eléctrico: armónicas, flicker’s, voltaje, frecuencia, factor de potencia y (3) atención comercial. Además, se debe tener esquemas de tarifa muy óptimos y generales de tal manera que las empresas tengan una perspectiva en el tiempo estable y lo menos complicado posible. Los marcos regulatorios (regulativos) contemplados desde hace años no se adaptan a la modernidad existente.


wind_turbine_cpoutput-power-and-attack-angle

Hello dear audience of this my blog about energy renewables. The figure is a previous post and shows three fundamental curves in performance of wind turbine: power coeficient, output power and attack angle vs wind speed. It is all posible states by a wind turbine. In this power level, all wind turbine in massive production are horizontal axis. Graphics are placed in horizontal form for easy visualization. I want will that it be useful. Development on Matlab/Simulink of MathWorks Inc both ideal turbine, power coeficient and  optimization process in attack angle.


In this post there is three examples of load diagram for different users. The data is colected each hour. This data has been used for optimization process in the reference. The load diagrams are:

load-diagram-example-1

load-diagram-example-2

load-diagram-example-3

From:
Francisco Goncalves Goiana Mesquita.“Design Optimization of Stand-Alone Hybrid Energy Sytems”. Mestrado Integrado em Engenharia Electrotécnica e de Computadores Major Energía. Universidade do Porto. Portugal. 2010

Conferencia “Motivación en Ingeniería Mecánica Eléctrica, Biomédica y Espacial”. Ciclo de Charlas de Motivación – Lugar Polideportivo Colegio Nacional San Juan de Chota, Chota – Perú. Lunes 20 Junio 2016 – 9 am. Organiza: Promoción Bodas de Plata 1987-1991 “Horacio Zeballos Gamez” – CN San Juan de Chota (in spanish)


Wind PV BESS hybrid power generation system with large-scale battery energy storage station

The Figure shown an example of Wind PV BESS hybrid power generation system with large-scale battery energy storage station (it is in BESS – Battery Energy Storage Station). It is used for compensation of aleatory energy production from wind turbine or PV plant. This BESS have orden of MW’s both for charge/discharge process.

Source:
Xiangjun Li, Dong Hui and Xiaokang Lai “Battery Energy Storage Station (BESS) – Based Smoothing Control of Photovoltaic (PV) and Wind Power Generation Fluctuations”. IEEE Transactions on Sustainable Energy, Vol. 4, No. 2, April 2013.


A block diagram of grid interconnection unit

There is a significative difference storage system and electric power system interconnection unit. The microgrid usually has as high power from grid point of view that it is connected to medium voltage fine, typically 15 kV in Poland. Although the power system interconnection unit has almost the structure as storage system, its primary voltage is in range of kilovolts and is sinusoidal. So, it requires different power electronic converter. It is assumed in Poland that all devices connected to 15 kV lines have to be joined using 50 Hz transformer. Hence, the grid interconnection unit can have a structure shown in Figure.

Source:
Piotr Biczel. “Power Electronic Converters in DC Microgrid”. IEEE 5th International Conference – Workshop, Compatibility in Power Electronics, CPE 2007. Poland.


simulations load diagram electric

During operation a microgrid, sometimes; renewable energy sources and the external power grid, dispatched electric energy simultaneously. Sometimes, many sources is neccesary for supply to electric load. Also, all it, considering both economic and technical criteria. The figure represent la connection and disconnetion of sources for each state of performance of a microgrid. Too, it is applicable to other similar electric systems.


energy of each source accumulate

In a microgrid, each energy source is required according to the criterion of costs and production capacity. During the operation time, accumulative energy from each source is represented in the figure. Criteria of linear optimization has been used in this modelling and simulation. This allows determining the nominal capacity and the ability to respond to sudden requests. Made on Matlab of MathWorks Inc.


cost_for_state_microgrid

A microgrid operate in state stable in this simulation made on Matlab. Each state represent a determinate time (10 minutes, 15 minutes o more o less). But during this time, la Microgrid makes calculations of energy cost dispatched for each source. The imagen is the global cost of microgrid (or similar or other electric system considering all costs).  The microgrid optimizer decides in base a linear programming the connection and disconnection of each source.


Optimum DG Penetration for Minimum Interruption Frequency

One question that most system operators are concerned with is the optimised DG penetration level. Relationship regarding different cost models between optimum DG penetration level and interruption frequency is indicated in Figure.

Optimum micro-source penetration level is positive related with the interruption frequency without DG penetration; especially for average interruption costs, the relationship is almost linear. This relationship is important for systemplanning; as the system interruption frequency without DG penetration is generally known, the system operator is able to roughly determine of the optimum DG penetration level from reliability point of view


example_performance_for_optimization_microgrid

Usually the microgrid used wind turbine (wind), PV (sun), battery (batt) and load, aditional it have a PCC with electrical network external (ene). Both the technical operation as the economic operation are important during performance microgrid. In the figure I show the results of optimization process with imaginary energy prices from diferent source mentioned. In top figure is the power distribution between sources and down figure the total cost of each state. Programming linear has been used in this modelling and simulations.


first steps in optimizing microgrids

This is first results of simulation in optimization microgrids. For variable electric load (4 states), the sources supply from diferents power plants. In a first moment, sun (blue line) and after is the wind. Other sources as battery and electrical network exterior not supply in this analysis for to get the minimum cost.