The Triple Hybrid stand-alone power supply system combines renewable energy such as solar power with a reciprocating engine generator and an energy storage battery system, to allow for optimal power stabilization control. The system’s main advantage is its ability to stabilize the volatile output of renewable energy by combining three types of power sources. It includes a lithium-ion energy storage system system from Delta with a 331kWh-container-type battery storage, four 125 kW power conditioning systems and four 50 kW PV inverters with conversion efficiency up to 98.6%.
“As the demand for decentralized power supply continues to grow, Delta is honored to partner with MHIET to provide energy-efficient solutions and products, such as energy storage systems, power conditioning systems and photovoltaic (PV) inverters, for this unique triple hybrid demo power plant,” said C.H. Ko, executive director of Delta Electronics (Japan). “The plant leverages renewable energy, energy storage systems, and engine generators to provide distributed power supply that can meet the needs of several applications in Japan and abroad.”
The lithium-ion battery system uses a 4C charging and discharging power rate to rapidly smoothen sudden fluctuations from the solar power generation due to diverse weather conditions. Delta is developing next-generation applications, such as VPP (Virtual Power Plant), self-consumption and grid stabilization by utilizing its lithium-ion battery system and renewable energy technologies.
The lithium-ion energy storage system has the function of DC bi-directional charge and discharge, and is designed to ensure functionality, convenience and safety under operating conditions such as high voltage and high current. The main core battery products are from lithium-ion battery technology and production line developed and transferred from Mitsubishi Heavy Industries, Japan, and fully assembled in Taiwan. The high-rate characteristics of 4C-rate are not only conducive to grid regulation, but also suitable to be direct power source for electric vehicles.
The power conditioning system consists of a single 125 kW power output and four parallel supply of 500 kW power output. The DC system connected to the battery storage container and the AC system of the grid are able to charge and discharge the battery and the grid bi-directionally through two-way AC-DC conversion.
The container-type energy storage solution uses a standard refrigerated container as the outer protection foundation. The internal cabinet-based design unit connects multiple battery modules in series to meet high voltage requirements. The cabinet configuration and module design cooperate with the thermal insulation of the refrigerated container and the existing air conditioning host circulation mode to maintain the internal temperature stability and extend the battery service life without consuming too much air conditioning power.
This not only meets the requirements of highly mobile construction, but also integrates the complete battery and power management, cabinet environmental monitoring, power conversion, fire extinguishing and other subsystems into the 20-foot or 40-foot container for modular design. It also achieves fast and flexible deployment, significant reduction in construction costs, shortened construction period with safety and reliability.