Research on Stochastic Optimal Operation Strategy of Active Distribution Network Considering Intermittent Energy

Abstract

Active distribution networks characterized by high flexibility and controllability are an important development mode of future smart grids to be interconnected with large scale distributed generation sources including intermittent energies. However, the uncertainty of intermittent energy and the diversity of controllable devices make the optimal operation of distribution network a challenging issue. In this paper, we propose a stochastic optimal operation strategy for distribution networks with the objective function considering the operation state of the distribution network. Both distributed generations and flexible loads are taken into consideration in our strategy. The uncertainty of the intermittent energy is considered in this paper to obtain an optimized operation and an efficient utilization of intermittent energy under the worst scenario. Then, Benders decomposition is used in this paper to solve the two-stage max-min problem for stochastic optimal operation. Finally, we test the effectiveness of our strategy under different scenarios of the demonstration project of active distribution network located in Guizhou, China.

Day-Ahead Active Power Scheduling in Active Distribution Network Considering Renewable Energy Generation Forecast Errors

“…The REG forecast errors obey a Gaussian distribution, and the practical operating data is shown as Figure 5. Values of some price parameters are shown as $0.03/kWh RCS switching action price [30] $1/time 1 The values are based on data from China.…”

“…Recently, a large number of distributed energy resources (DERs), such as distributed generation (DG), electrical energy storage (EES), and controllable loads (CLs), are being placed in medium-voltage distribution networks for energy conservation, emissions reduction and environmental protection [1]. With these DERs, information and communication technologies (ICT) and power electronics-integrated devices have rapidly developed in the distribution networks, which thus have evolved into active distribution networks (ADNs).…”

Assessment of Credible Capacity for Intermittent Distributed Energy Resources in Active Distribution Network

“…It responds to wind power fluctuations and balances the disturbances by appropriate adjusting and control. A simple piecewise linear model is adopted, which is given below in Equation (11).…”

“…A great number of studies considering this issue are emerging, which manage to analyze the impact quantitatively [2,3], statistically figure out the irregularity of intermittency and fluctuations, and predict and estimate future output in various ways [4,5]. Current literature can also be found investigating other domains such as grid planning [6][7][8][9], operation analysis, and optimization control considering the uncertainties of DG [10][11][12][13][14][15][16]. A power supply and storage capacity for operation optimization is proposed and studied [17].…”

Optimal Dispatching of Active Distribution Networks Based on Load Equilibrium

“…To deal with these issues, traditional distribution networks are gradually evolving from a passive mode to an active mode. Hence, the concept of Active Distribution Networks (ADNs) [6][7][8][9] has been proposed. In the context of ADNs, distributed energy resources (DERs) (containing RE generators), controllable loads, and energy storage equipment can be actively adjusted using intelligent control techniques to attain specific operation objectives [10].…”