Three-Phase Wide-Range Shore Power Converters for Ships: Ensuring Stable Frequency and Voltage for Green Shipping

The core challenge facing traditional shore power systems lies in the lack of uniform global grid standards. Chinese ports generally use the 380V/50Hz system, while ports in Europe and the United States commonly employ 220V or 480V systems; meanwhile, ships’ onboard power distribution systems come in a variety of configurations, including 120V and 240V at 60Hz. These differences in voltage and frequency prevent ships from connecting directly to shore power, necessitating the use of specialized conversion equipment to ensure system compatibility.

Bangzhao Electric BZT Series Shore Power Converters

Input Conversion Stage
: Converts AC power to DC power using active front-end rectification technology, eliminating frequency differences and suppressing input harmonics, thereby keeping the total harmonic distortion (THD) of the current within 3%.
Output Conversion Stage
: Utilizes Space Vector Pulse Width Modulation (SVPWM) technology to invert DC power into the AC power required by the vessel (120/240V/60Hz or 380V/50Hz), with voltage accuracy of ±0.5% and minimal phase synchronization error.
Intelligent Control Layer
: Equipped with phase-locked loop (PLL) technology and soft-start functionality, it enables shock-free grid connection between shore power and the ship’s electrical system, with fault response times reduced to the 10-millisecond range.
“This device acts as an intelligent power bridge between the ship and shore.” It also integrates multiple protection mechanisms, including overvoltage/undervoltage protection, overload protection, short-circuit protection, and corrosion resistance.