Transition towards higher penetration of renewables: an overview of interlinked technical, environmental and socio-economic challenges

Accurate topology estimation is crucial for effectively operating modern distribution networks. Line outages in a distribution network change the network topology by disconnecting some parts of the network from the main grid. In this paper, an outage detection (or topology estimation) algorithm for radial distribution networks is presented. The algorithm utilizes noisy power flow measurements collected from a subset of lines in the network, and statistical information characterizing errors in forecasting load demands. Additionally, a sensor placement scheme is presented. The sensor placement provides critical sensing for the outage detection algorithm so that any number of possible outages in the network can be detected. The performance of the proposed outage detection algorithm using the proposed sensor placement is demonstrated through several numerical results on the IEEE 123-node test feeder.

Section: Measurement Modelmentioning

confidence: 99%

Outage Detection for Distribution Networks Using Limited Number of Power Flow Measurements

Alnajjab

Samudrala

Chen

et al. 2020

“…Reference [2] stated that solar and wind energies are freely accessible in nature and are more advantageous than other sources for power generation. However, the combination of solar and wind energies increases the complications due to their unpredictable and variable nature, which presents certain technical, environmental, and socio-economic challenges [3]. A hybrid renewable energy system can be designed using mathematical models of different components and optimization techniques [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Grid-connected Solar-wind Hybrid System with Electric Vehicle Charging Station

Singh

Chauhan

Singh

2021

107

Recently, renewable power generation and electric vehicles (EVs) have been attracting more and more attention in smart grid. This paper presents a grid-connected solar-wind hybrid system to supply the electrical load demand of a small shopping complex located in a university campus in India. Further, an EV charging station is incorporated in the system. Economic analysis is performed for the proposed setup to satisfy the charging demand of EVs as well as the electrical load demand of the shopping complex. The proposed system is designed by considering the cost of the purchased energy, which is sold to the utility grid, while the power exchange is ensured between the utility grid and other components of the system. The sizing of the component is performed to obtain the least levelized cost of electricity (LCOE) while minimizing the loss of power supply probability (LPSP) by using recent optimization techniques. The results demonstrate that the LCOE and LPSP for the proposed system are measured at 0.038 $/kWh and 0.19% with a renewable fraction of 0.87, respectively. It is determined that a cost-effective and reliable system can be designed by the proper management of renewable power generation and load demands. The proposed system may be helpful in reducing the reliance on the over-burdened grid, particularly in developing countries.

“…Decreasing the capital cost of REs has enabled countries to set ambitious targets for increasing the share of REs in their energy mix [7]. Besides bringing down the overall carbon emissions, such resources subsequently provide the benefits of no carbon taxes, feed-in tariffs, tax rebates, and the advantage of attaining the renewable portfolio standards [8]. Owing to numerous advantages, efforts are being made for integrating REs and energy storage systems (ESSs) into the RES.…”

Section: Introductionmentioning

confidence: 99%

Integration of PV and Battery Storage for Catenary Voltage Regulation and Stray Current Mitigation in MVDC Railways

Aatif

Yang

et al. 2021

Innovative advancement in power electronics is reshaping the conventional high-voltage transmission systems and has also opened a new paradigm for researchers to consider its benefits in the railway electrification system (RES). In this regard, the medium-voltage direct current RES (MVDC-RES) is a key area of interest nowadays. In this paper, a secondary energy source (SES) consisting of renewable energies (REs) and energy storage systems (ESSs) is proposed to solve the issues of catenary voltage regulation, rail potential, and stray current in the MVDC-RES. Some of the major integration topologies of the SES are analyzed for MVDC-RES and the most effective one is proposed and implemented. The voltage at the point of connection (PoC) of the SES is used as a reference for controlling different operation modes of REs and ESSs. Moreover, feedforward control is used at the ESS converter to attain the quick response from the batteries for the desired operation. The proposed scheme improves the catenary voltage, and reduces the rail potential and stray current. Besides, the scheme provides higher energy density and reduces line losses. Simulation results are provided to validate the operation modes and advantages of the proposed scheme.