Conversion Frequency Control System Of Freezing Parallel Machines

With the develop of computer science , automatic control has been widely used in the industry field. In various region, because of different circumstance,object and cost,we should design our structure to get the best effect. Especially for the use of freezing control in the field of industry and merchantry.Now the food refrigerating chain has been widely noted as a complicated system engineering. That means the perishable food should be always controlled in the low V-nperarure from the beginning of collecting to the end of selling to ensuie the quality as well as prevent the polluting.To the large-scale freezing circumstance, a stable controlling system means a lot to the operation and development of a enterprise.In order to make the compressor suit more efficiency and prolong its operating time, we often parallel many small size ones to replace one compressor of large power. Compare with one compressor, paralleling model is more difficult to control. Now the automatic controlling system of paralleling suit is in the phrase of experiment in the world and the control system is basically realized by artificial mode. That produced many problems as follows: difficult to balance the working condition of the individual compressor; difficult to realize the accurate control to the temperature of cold shed; easy to hurt the life of the compressor when the environment temperature is generously changed which will trigger the frequency start of the compressor.In order to solve the problems quoted above, the article analyses and introduces the technical development in the field and expound its settle case. From the beginning of building a thermodynamic model, the article made a all round introduce including the arithmetic realizing, model design, etc. by the above means the system is just as well to settle the problem being in the freezing system. The total design is concise and practical.