Research On Control Algorithm Of Hybrid Power Crane System

With the continuous development of the world economic integration process's unceasing development, crane has a wide range of applications at the port and a growing number of areas. As a result of the rapid rise in energy prices and environmental protection's further request, the disadvantage of high energy consumption and low efficiency of the traditional crane in reliefs day by day, so many countries strengthen research and development of crane energy-saving and green manufacturing technology, the green have become the development trend of port machinery.These compositions of Hybrid power crane system are diesel generator sets, super capacitors, bi-directional DC-DC converter and work drive motor. The backup energy of the load drop was stored by the super capacitor, this system that can make full use of recycled supplies of renewable energy as the driving force can be greatly improved energy efficiency, so the energy consumed by braking resistor originally can be fully utilized and energy-saving and environmental protection can be achieved.This paper studies the principle of the hybrid power crane system and each device characteristics, and develops a systematic optimal control strategy to improve the performance of generating units to reduce engine capacity, full recovery of the load potential energy, improve energy efficiency of the system.This article analyses the whole system of hybrid motive crane in detail, establishes the control strategy, and designs the Bidirectional DC-DC Converter Based on Soft Switching. Finally the article also carries out the experiment and analyzes the effect of energy-saving of the system.(1) Analyzing the characteristic of the driving components of the hybrid power crane system, including the principle and characteristic of the diesel generator set, super-capacitor, Energy Management System and bidirectional DC-DC convertor. According to the above analysis, the selecting of diesel generator set and super-capacitor becomes straightforward;(2) According to the characteristics of the hybrid power crane system, design the control strategies, including diesel generator set control strategy, dynamic braking control mode, the super capacitor energy distribution control strategies, bi-directional DC-DC charge and discharge control method;(3) Designing the soft-switching bi-directional DC-DC converters, and describing the system used in the actual phase-shifted full-bridge soft-switching converters, and studying the bi-directional DC-DC converter control strategy, and conducting systematic experiments to testing the correctness of the working principle of the whole system accuracy, the control strategies of hybrid power crane system and bi-directional DC-DC soft-switching controller is reasonable. The article also analyzes the data of the experiment and studies the effect of energy-saving.