Design For Frequency And Load Automatic Control Of Marine Generators

Ship power station is an important component to the whole ship power system. That ship runs reliably and economically holds a significant meaning for ensuring ship operates safely. The development and application of computer and network technology on modern ship industry propel the automation and intellectualization of management and operation of ship power station. This thesis adopts the automatic control as research subject. The Programmable Logic Controller (PLC) is applied to ship power station automatic control system, which achieve the design of synchronous generator parallel operation and frequency and active power auto regulator.This paper, in accordance with the operation principle and relative regulations of synchronous generator, analyzes the conditions for realizing automatic start, switch-on and power supply, parallel operation, heavy load inquiry, and separation and shutting down, and compile the relative logic flow chart. The frequency and power regulator is designed based on the SIEMENS S7-300 Programmable Logic Controller (PLC) as control center and combined with the signal collecting unit and execution unit that enable the frequency and power regulator to adjust the speed of generator according to the grid frequency. The regulator adjusts the output power of synchronous generator according to electric network load, and sends out instruction such as parallel operation and separation and shutting down according to working conditions requirement.Generator operation control program is to be designed via the ladder program of S7 - 300 STEP7 5.4. By use of SIEMENS configurable software WinCC, the system designs monitoring-interface, achieves data collection and realizes the monitoring and control of synchronous generator.