The Semi-physical Simulation Research On Power Blackout Of Electrical Propulsion Marine

With the development of Power Electronics and variable frequency speedadjusting technology, electrical propulsion marine will be the most important aim ofthe marine research. Due to the high propulsion power and the adding of high newelectrical load, more requirements about the management of marine power are needed.Power blackout is one of the most important technologies when managing the powerof electrical propulsion marine. The domestic research and application of thisquestion are less. As a result of it, this thesis researches power blackout.Due to the low confidence level of digital simulation, this thesis uses thesemi-physical method to research the control algorithm of power blackout and verifythe practicability.The mathematical models of power generator equipment and main powerconsumption equipments are built and analyzed. As the main load, the loadcharacteristic of marine propeller is analyzed as a key point. And then it researcheshow to simulate the load characteristic of marine propeller by two motors. Thesemodels are constructed as a whole marine electrical system model.Two control algorithms of power blackout are proposed. One means three-loopof power, speed and current. The other transfers the traditional two-loop of speed andcurrent to two-loop of power and current. These two algorithms are simulated andverified with the object of a DC motor by a digital simulation way.Simulation machine RT-LAB, PLC, converter and variable frequency motor areused to build a whole small-scale semi-physical simulation system which cansimulates the whole marine electrical system. The mathematical models and controlalgorithms are calculated in RT-LAB, the base control is calculated in PLC, themarine propeller is simulated by two variable frequency motors. By this small-scalesemi-physical way, the mathematical models and the material object are combined. Ituses the same data by exchanging data to research and verify the two controlalgorithm of power blackout. In order to approximate the real marine, some functionsof PMS and fast stop function when breakers are break abnormally are needed. In this way, when the damage of the generator is detected, the marine can be stop right away.Fast unloading can be an important supplement to the power blackout. The powerblackout algorithm including fast unloading is researched and verified again with theobjection of asynchronous motors by a small-scale semi-physical way.After research and verification, the algorithms in this article can unload fast andblack out the power. These specifications fit the requirement of the real marine.