Aug 2019 / by M Pradeep Kumar, S. Durairaj and P. Sridharan
Nowadays, wind and solar power are one of the greatest demand in the electricity market. Due to the inherent variability and uncertainty in grid frequency, a combination of the hybrid system of wind, solar, thermal and ESS brings numerous difficulties in power systems, particularly when generation is not equal to demand. Power systems possess a lot of difficulties like quality, stability, and reliability. In this paper, grid frequency is regulated by means of a hybrid system of wind and solar power with batteries (ESS). The use of energy storage system seems to be one of the best solutions in the power system network. The model of the power system studied in this paper is established on the MATLAB/SIMULINK platform.
Keywords: Energy storage system, frequency regulation, power system control, wind energy generation
Jul 2019 / by Qingqing Zeng and Junxia Lang
Under the new economic background, the new normal characteristics of China’s power development are also obvious, highlighting the slowdown in the growth of electricity consumption in the whole society, the overall downturn in power consumption in high energy consumption industry, the continuous optimization of power structure, and the more obvious regional differences. In view of these problems, this paper analyzes the economic and stability of the power grid and the constraints of the power grid stability and the transmission capacity of the transmission section, and constructs the economic consideration with the minimum purchase cost and the minimum discharge amount of the pollutant gas as the objective function. And the particle swarm optimization algorithm is used to solve the problem. In this paper, an example is given to calculate and analyze the actual grid, and the validity and feasibility of the model are verified.
Keywords: New normal, new energy grid, electrical engineering, green development, environmental protection
Jul 2019 / by Krishnat Uttam Jadhav and Archana G. Thosar
The wind energy process converts wind energy directly into electrical energy even so the alterations within the wind velocity in different climate conditions affect the generation associated with wind power. Because of the immediate changing characteristics of the wind, it can be desired to look for the one particular optimum wind energy operations that guarantee maximum energy delivery. Consequently, it is important to feature a controller that may observe the ideal peak irrespective of wind velocity. An evaluation has been built between overall performance of various MPPT algorithms judging by different velocity responses and also potential to offer the maximum energy delivery. The perturbation and observation, incremental conductance and fractional open-circuit voltage approaches are used with buck converter and the overall performance regarding the increasing time period, oscillating time period, output voltage, a ripple in end result voltage are reviewed by actual experimental set up. The P&O criterion has been observed as being the most effective MPPT means for wind energy techniques. However, the IC and FoCV approaches are much less productive and possess complications figuring out the best possible step-size.
Jul 2019 / by Manaullah and M. Shariz Ansari Singh
The power generation of most islands depends mainly on costly oil. Since the cost of energy is very high so these are the best test place for the implementation of the new technologies. We have considered the case of a remote island of India i.e. Lakshadweep Island. Lakshadweep Island is one of the union territories of India. In Lakshadweep Island electricity is mainly generated from diesel generator (DG) sets. In this work, firstly an analysis has been done to find out that in how many years we will achieve the total available solar energy potential. If we start generating up to the available solar energy potential then some islands will become renewable islands and this will increase the reliability, employment and decreases the cost of energy generation and pollution. Pearl and Logistic models have been used to find out the growth rate of SPV power generation. Using these models we found out that in how many years we would achieve the total available potential. Secondly, we have proposed a model of a hybrid power generation system for Lakshadweep Island. The simulations and techno-economic evaluations have been done with the help of HOMER (Hybrid Optimization Model for Electric Renewables) software. Thousands of simulations have been carried out by the HOMER to achieve an optimal autonomous system configuration, in terms of system net present cost (NPC) and cost of energy (COE). For the optimal solution HOMER software considers PV, diesel and battery only and the NPC and COE for this hybrid system comes out to be $62,913,620.00 and 0.244 $/kWh respectively. The NPC and COE for the diesel-only system are $168,000,000.00 and 0.653 $/kWh respectively. It means if we are using hybrid system instead of diesel-only system, the NPC is reducing from $168,000,000.00 to $62,913,620.00 and COE is reducing from 0.653 $/kWh to 0.244 $/kWh which is a great reduction. At the same time pollution is also reduced greatly. The emission of CO2 from the diesel-only system is 23,315,826 kg/year and from hybrid system is 2,088,932 kg/year. Hence the reduction in CO2 emission is 21,226,894 kg/year which is around 95%. It means if we use a hybrid system instead of diesel-only system, pollution is reduced by 95%. Similarly, other pollutant materials are also reduced greatly.
Keywords: HOMER; net present cost; cost of energy; renewable energy; technology diffusion