Island communities and facilities often face limited grid access, fluctuating solar generation, and demanding environmental conditions. An off-grid solar-storage microgrid can provide stable, around-the-clock power while improving renewable energy utilization and reducing reliance on conventional energy sources.
Building a 24/7 Self-Sufficient Power Supply System for Island Environments
Island regions are typically remote from the main power grid and have limited power supply capacity. Constrained by geographical conditions and infrastructure limitations, they face long-term challenges such as unstable power supply and operational and maintenance difficulties. For residential communities, tourist facilities, and public service venues, a power outage would directly disrupt normal daily life and operations.
At the same time, while islands possess abundant solar resources, relying solely on photovoltaic power generation is insufficient to meet round-the-clock electricity demands due to diurnal variations and weather conditions. Harsh environmental factors—such as high temperatures, high humidity, and salt-laden air—also place higher demands on the reliability and long-term operational capability of energy equipment.
To address the complex energy consumption environment on islands, YUNT provides comprehensive off-grid solar-storage microgrid solutions. Through the coordinated operation of photovoltaic systems, energy storage, and intelligent control systems, we build a secure, stable, and autonomously operating energy system for our customers.
Scenario Requirements: Ensuring Continuous and Stable Power Supply on Islands
Island energy systems typically face the following challenges:
- Insufficient grid coverage or limited power supply stability;
- Fluctuations in photovoltaic power generation;
- High salt fog and high humidity can compromise equipment reliability;
- Limited O&M resources and high demands on system stability.
The project aims to achieve:
- Stable power supply around the clock;
- Improved PV energy utilization;
- Reduced reliance on diesel-powered generators;
- Enhance the system’s long-term operational reliability.
Therefore, a microgrid system is required that combines off-grid operation capabilities, environmental adaptability, and intelligent energy management capabilities.
System Solution: Building an Autonomously Operating Island Microgrid
YUNT provides integrated services—ranging from solution design and equipment integration to on-site commissioning—tailored to the specific characteristics of island applications.
Project Integration:
- 4 units of 125 kW grid-forming PCS;
- 4 units of 250 kW STS switching systems;
- 4 units of 60 kW PV MPPT charge controllers;
- Energy storage system;
- EMS Energy Management Platform.
By integrating PV, energy storage, and loads into a unified microgrid control system, the platform enables centralized energy management.
The EMS intelligently optimizes operating strategies based on PV generation, energy storage status, and load demand:
Daytime operation phase:
- Prioritize power supply from PV;
- Excess electricity is stored in the energy storage system;
- Increase the utilization rate of renewable energy.
At night and during cloudy or rainy weather:
- The energy storage system continuously discharges electricity;
- Maintain stable operation of critical loads;
- Connect to a backup power source when necessary to ensure uninterrupted power supply.
Utilizing grid-forming PCS units, the system can autonomously establish stable voltage and frequency in off-grid conditions, ensuring the independent operation of the island’s energy system. Additionally, the system supports coordinated operation of multiple units, allowing for flexible capacity expansion based on load demand to meet the needs of island projects of various scales.
To address the high salt fog and high humidity typical of island environments, the equipment has been specially adapted with anti-corrosion and moisture-proof features to enhance reliability during long-term outdoor operation.
Project Value: Enhancing Island Energy Self-Sufficiency
Through the off-grid photovoltaic-storage microgrid system, the project helps clients reduce their reliance on traditional energy sources and external power grids, increases the utilization of renewable energy, and builds a more stable and secure power supply system.
The solution not only improves the operational reliability of the island’s energy system but also reduces the complexity of future operation and maintenance, providing a continuous and stable energy supply for residents, tourism facilities, and public services.
This project fully demonstrates YUNT’s capabilities in off-grid microgrids, high environmental adaptability, and system integration in complex scenarios, providing mature and reliable comprehensive energy solutions for applications such as islands, reefs, and coastal industrial parks.
