Case Study: Microgrid Projects in Lianyungang Village and Toll Stations

Introduction:

The new energy industry has been continuously evolving, with the advent of microgrid projects becoming a game-changer for remote areas and establishments that require consistent and reliable power. In this article, we explore two such projects: a microgrid system in Lianyungang Village and another at toll stations. These case studies highlight the potential of localized energy generation and storage solutions in enhancing energy sustainability and reliability.

Background:

Microgrids are localized grids that can operate independently or in conjunction with the traditional centralized electrical grid. They can be powered by renewable energy sources such as solar and wind, and are often equipped with energy storage systems to ensure a stable power supply. The implementation of microgrids is particularly beneficial in areas where the main grid is unreliable or non-existent.

Lianyungang Village Project:

Lianyungang Village, located in a remote part of China, faced significant challenges with its energy supply. The introduction of a microgrid project in the village aimed to provide a stable and sustainable power source. The microgrid was designed with solar panels, energy storage systems, and advanced control mechanisms to manage electricity distribution efficiently.

Toll Stations Project:

Toll stations, as critical points on highways, require a continuous power supply for operations. A microgrid project was initiated to ensure uninterrupted power, leveraging solar energy and battery storage solutions. This not only provided a reliable power source but also reduced the toll stations' dependence on the traditional power grid, leading to cost savings and reduced carbon emissions.

Energy Storage Inspection 2023 by HTW Berlin:

To understand the technical aspects and efficiency of energy storage systems, which are integral to microgrid functionality, we refer to the "Energy Storage Inspection 2023" conducted by the Solar Storage Systems Research Group at HTW Berlin and co-authors from KIT. The study provides an in-depth analysis of various battery technologies, including lithium-ion, sodium-ion, and sodium-nickel chloride batteries, within the context of residential PV-battery systems.

Efficiency and Performance Analysis:

The inspection analyzed the performance of different battery technologies, with a focus on inverter efficiency, standby power consumption, and the System Performance Index (SPI). It was found that the lithium-ion battery demonstrated superior performance in terms of efficiency and battery losses compared to alternative technologies. This insight is crucial for microgrid projects where efficiency translates into better system performance and enhanced economic viability.

The study also included a simulation-based assessment of the operational behavior of PV-battery systems over a year, taking into account changes in regulatory frameworks, electricity prices, and feed-in tariffs. The results indicated that with the removal of the 70% feed-in limit and adjustments in tariffs, the SPI values increased, suggesting an improved economic case for systems with higher efficiencies.

Case Study Outcomes:

In Lianyungang Village, the microgrid project resulted in a significant improvement in the quality of life for residents. The reliable power supply enabled by the microgrid allowed for consistent lighting, the operation of electrical appliances, and the support of local businesses. The project also provided insights into the management of energy storage and the optimization of power distribution.

At the toll stations, the microgrid facilitated smooth operations by ensuring a stable power supply for critical systems such as surveillance, lighting, and automated toll collection. Moreover, the use of solar energy contributed to a greener footprint for the transportation infrastructure.

Challenges and Future Directions:

Despite the success of these projects, challenges remain, particularly concerning the efficiency of alternative battery systems. The Energy Storage Inspection 2023 highlighted the higher losses associated with sodium-ion and sodium-nickel chloride batteries. These findings underscore the need for continuous improvement in battery technology to enhance the sustainability and efficiency of microgrid solutions.

Conclusion:

Microgrid projects in Lianyungang Village and toll stations showcase the potential of decentralized energy systems in delivering reliable and sustainable power. The insights from the Energy Storage Inspection 2023 by HTW Berlin and KIT provide a valuable benchmark for evaluating the performance of energy storage technologies within these systems. As the new energy industry advances, the refinement of battery technologies and system efficiencies will be critical in scaling up microgrid solutions across various sectors.