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Solar Energy is a clean and renewable power resource and is on its way to high level penetration in the world electricity energy basket. However, there are several challenges associated with Solar Energy, like intermittency, limited dispatch ability and non-storability. Non-storability in a standalone PV system can be mitigated by incorporating energy storage devices like battery to store the electrical...
This paper address the issues of surplus power that would happen when the sum of the generated power of Photovoltaic(PV) Generation Systems and minimal output of utility power plant exceeds total electricity demand that would affect the stable operation of power system. The cooperative control of customer's appliances such as Heat Pump Water Heater(HPWH) and battery is applied for utilizing surplus...
This paper proposes droop control for Multi-Level Virtual Conductor (MLVC). This control method aims at overcoming the problem that circulating current flows when MLVC constitutes a mesh connection. Generally, the voltage difference between the terminals of any conductor is zero volts. However, MLVC can keep the voltage difference between the converter terminals constant at a certain value. In this...
This paper presents a methodology for evaluating benefits of battery storage for multiple grid applications, including energy arbitrage, balancing service, capacity value, distribution system equipment deferral, and outage mitigation. In the proposed method, at each hour, a look-ahead optimization is first formulated and solved to determine battery base operating point. The minute by minute simulation...
Massive integration of generations from renewable energy sources such as photovoltaic (PV) and wind power generations into power systems causes large frequency fluctuations because their outputs are intermittent in nature. Battery energy storage system (BESS) is considered as one of solutions to this problem. In operation of the BESSs, their characteristics should be taken into consideration. For...
The battery is the energy storage device of the satellite power system. The working life of power system mainly depends on the life of the battery. The health state of the battery refers to the battery current performance deviation from the nominal design performance and indicators, so the performance of the battery in the future can be judged by the health state of the battery. Therefore, the study...
In this paper, the potentials, peculiarities and prospects of solar power generation system to the platform roofs of the railway station will be discussed. Based on the rough estimation, the total potential of our company for platform roof PV system is amount to be more than 100MW. While the railway premises have such a high potential for solar power introduction, they have also difficulties compared...
Auxiliary loads, such as lighting systems, electric motors, air compressor, pumps, fans, and other electric loads, reduce the fuel economy of conventional internal combustion engine (ICE), hybrid, and plug-in hybrid electric vehicles. Hybrid technology makes use of electric energy stored in batteries to power the drive train of a vehicle and increase the fuel economy, but it also comes with a high...
This paper establishes an economic operation model of microgrid including photovoltaic, wind energy, heat recovery boiler and battery. The emission of pollutant and greenhouse gases is taken into account and the minimum operation cost of microgrid is taken as objective function. The proposed model is solved by particle swarm optimization algorithm. Besides, the feature of battery is also studied,...
This paper presents a methodology for modeling and analyzing the load demand in a distribution system due to electric vehicle (EV) battery charging. Following a brief introduction to the common types of EV batteries and their charging characteristics, an analytical solution for predicting the EV charging load is developed. The method is stochastically formulated so as to account for the stochastic...
The electrical energy production from renewable sources has gained considerably in importance in the last years. A meaningful possibility of energy generation from renewable sources is the use of wind energy. The wind energy generation is weather dependent and load independent. Therefore, it can have a certain unreliability, which can cause the power fluctuations into the system. A possible solution...
A main property of a fuel cell is its comparatively long start-up time, its slow response to load changes and shut-down. If a fuel-cell is used as generator in decentralized energy generation to operate a grid in island or emergency power mode, the required load power — this includes active and reactive power — has to be delivered at all times. In order to meet this demand under island and emergency...
This paper presents modeling and simulation study of a fuel cell power system for ships. The paper reviews the ship's current power system and its limitations. A detailed discussion of the issues associated with integrating fuel cells to ships and power conditioning systems for fuel cells to overcome the limitations is also presented. A model of the fuel cell and an energy storage system to mitigate...
In this paper, an approach is proposed for time series prediction based on modified probability neural network (MPNN). Bayesian-statistics and decision-making theories and non-parameters density function estimation using Parzen-window function are applied to MPNN. The efficiency of the approach was demonstrated by a case study, an application for prediction on moonlet power system data, through comparison...
This paper deals with a DC-micro grid in an isolated island. The proposed method is composed of gearless wind power generation system, battery, and DC loads in DC distribution system. The battery can avoid DC over-voltages by absorbing the PMSG power during line-fault. In addition, the control schemes in this paper include the maximum power point tracking (MPPT) control and a pitch angle control for...
Wind turbine generation has been in operation for both on-site and commercial uses. However, one major obstruction of the wind turbine generation is its uncertainty. As known, the wind power is dependent on the cube of wind speed, which varies over time. To obtain the maximum wind power, variable-speed Wind Turbine Generators (WTGs) are operated. As a result, fluctuation of power output occurs. Inevitably,...
In this paper, the environmental impact evaluation was examined on an independently operated microgrid. For the evaluation of environmental impact, we measured the amount of CO2 exhausted from the micro grid when the installation capacity of photovoltaic and of battery was changed. The amount of CO2 emission was compared by equipment with different amount of the introduction. The capacity of battery...
Advanced photovoltaic power systems require a bidirectional power converter functioning as a battery charger and a voltage regulator to maintain state-of-charge of the battery and regulate the load voltage respectively. This paper presents a photovoltaic power system which performs maximum power point tracking, battery charging and regulation of the load voltage with an integrated converters configuration...
Power system operating conditions that are on the verge of being unsafe have encouraged utilities and power consumers to look for bulk energy storage systems. Various energy storage systems (ESSs) have excellent records and have been used for decades. This paper provides an overview of different energy storage technologies and their possible applications in power systems. The purpose of this analysis...
Overall structure of electrical power system is in the process of changing. For incremental growth, it is moving away from fossil fuel based operations to renewable energy resources that are more environmentally friendly and sustainable. At the same time it has to grow to meet the ever increasing need for more energy. These changes bring very unique opportunities and obstacles. Over the past few decades...
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