Sizing Hybrid Energy Storage Systems for Distributed Power Systems under Multi-Time Scales

Abstract

Abstract:With the rapid development of industry, more fossil energy is consumed to generate electricity, which increases carbon emissions and aggravates the burden of environmental protection. To reduce carbon emissions, traditional centralized power generation networks are transforming into distributed renewable generation systems. However, the deployment of distributed generation systems can affect power system economy and stability. In this paper, under different time scales, system economy, stability, carbon emissions, and renewable energy fluctuation are comprehensively considered to optimize battery and super-capacitor installation capacity for an off-grid power system. After that, based on the genetic algorithm, this paper shows the optimal system operation strategy under the condition of the theoretical best energy storage capacity. Finally, the theoretical best capacity is tested under different renewable energy volatility rates. The simulation results show that by properly sizing the storage system's capacity, although the average daily costs of the system can increase by 10%, the system's carbon emissions also reduce by 42%. Additionally, the system peak valley gap reduces by 23.3%, and the renewable energy output's fluctuation range and system loss of load probability are successfully limited in an allowable range. Lastly, it has less influence on the theoretical best energy storage capacity if the renewable energy volatility rate can be limited to within 10%.

Smart Community Energy Cost Optimization Taking User Comfort Level and Renewable Energy Consumption Rate into Consideration

“…The time-of-use gas price is shown in Table 2. In addition, the costs of photovoltaic and wind turbine power generation are set as 10 and 14 US cents/kWh [33]. Because of the irregular use of nature gas [32], this paper takes time-of-use gas price to optimize system operation cost.…”

“…The time-of-use gas price is shown in Table 2. In addition, the costs of photovoltaic and wind turbine power generation are set as 10 and 14 US cents/kWh [33].…”

Evaluation of Hybrid Energy Storage Systems Using Wavelet and Stretched-Thread Methods

“…In general, the sizing problem is solved with optimization techniques to minimize the acquisition and operating costs and improve grid health indexes [12][13][14][15][16]. Each ESS alternative's time scale is treated with filters [17][18][19], Fourier series, Wavelets, and neural networks [20][21][22].…”

Reduction of Power Production Costs in a Wind Power Plant–Flywheel Energy Storage System Arrangement

“…A serious problem of the power systems in many countries is the inclusion of a significant number of small (when compared to conventional power plants), dispersed sources of energy of an intermittent nature [1][2][3][4][5]. These include mainly wind power plants (both individual turbines and wind farms).…”