In 2018, researchers Bai Yi, Shi Yanyan, Zhang Qiaojie, and Bai Lianping from the School of Automation at Beijing University of Information Science and Technology published a paper in the first issue of "Electrical Technology." The study highlighted the promising future of tidal power generation as a renewable energy source. They developed an experimental device for laboratory-based research, which laid the groundwork for future offshore trials of tidal power systems.
The control system of the power flow simulation device relies on frequency conversion speed regulation of a three-phase asynchronous motor using a frequency converter. To enhance user interaction, the LabVIEW platform was utilized to design both the front panel and block diagram interface. VISA technology facilitated data transmission, while RS485 communication enabled continuous operation of the inverter. This setup allowed the motor to drive a bidirectional impeller pump, simulating water flow conditions for tidal current experiments.
With the rapid growth of the global economy, traditional fossil fuels are becoming increasingly insufficient due to their limited reserves, environmental impact, and non-renewability. Ocean energy, including tides, waves, temperature gradients, and salinity differences, offers a sustainable alternative. Its large storage capacity, high energy density, and predictability make it a promising candidate for future energy solutions.
Testing tidal power generators offshore is costly and complex. Therefore, the development of a laboratory-scale simulation device is essential for preliminary research. This paper presents a tidal current power generation simulation system and its control method, enabling controlled experiments under laboratory conditions.
The system includes a closed-loop water flow setup with adjustable flow rates. Key components include a motor, bidirectional impeller pump, connecting flange, conductor, plexiglass guide, impeller-driven generator, auxiliary seal, and flow sensor. By controlling the motor’s frequency via a frequency converter, the system can simulate various tidal current conditions.
In the control system, the inverter's output frequency can be adjusted manually, through analog signals, or via serial communication commands. While manual control is less efficient, the third method—using serial communication—offers greater automation and precision. LabVIEW's VISA technology, combined with RS485 communication and Modbus protocol, enables seamless control of the inverter.
LabVIEW is a powerful tool for developing virtual instruments, offering a graphical programming environment that simplifies complex tasks. It supports multiple communication standards, including TCP/IP, USB, and serial interfaces. The VISA architecture ensures compatibility across different platforms and devices.
RS485, known for its robustness and long-distance communication capabilities, is ideal for industrial applications. It supports multi-point communication and is more noise-resistant than RS232. The Modbus protocol, widely used in industrial networks, allows master-slave communication and is compatible with various transmission media.
The ACS550 inverter uses Modbus RTU mode, which is efficient and reliable. Communication parameters such as baud rate, parity, and stop bits must match between the host computer and the inverter. LabVIEW programs were designed to configure the serial port, initialize the inverter, send commands, and manage data transfer.
Experimental results showed that the system successfully simulated tidal current conditions. The flow velocity data matched real-world scenarios, validating the device's effectiveness. The user interface was intuitive, allowing users to select the inverter port, start the system, adjust frequencies, and monitor performance in real time.
This study contributes to the development of tidal energy by providing a cost-effective and efficient simulation platform. It supports further research on turbine design, energy conversion efficiency, and generator performance, paving the way for future offshore tidal power projects.
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