The Technical Research Of Container Crane Recycling Renewable Sources Of Energy

In recent years, energy and environmental problems are more and more concerned by people, how to protect the environment and save energy has become extremely important for the society today. In the port, rubber-tyred container crane (RTG) with its mobility, flexible, and other advantages, has been widely applied in container load or unload. Hoist crane which starts and brakes frequently, requires high peak power source and the ability to absorb regenerative braking energy reliably and efficiently. During braking time, motor in will produce large amounts of energy, traditionally, there are 2 ways to deal with these renewable energy: one way is to add the direct consumption energy resistance in the dc side of the frequency converter, which will consume the renewable energy ;Another way is feed the renewable energy back to the grid. Renewable energy which produced during the braking process will be wasted with additional energy resistance and takes a lot of heat dissipation space; If feed back to the grid, it can save the energy, but will cause great impact. The traditional processing way cannot satisfy the demand, so constant innovation in renewable energy recycling technology research is needed.This paper proposes a design scheme which using super capacitor to recycle the renewable energy produced in the process of crane operation. According to the analysis of characteristics and regularity of the application super capacitor, this paper chooses Tianjin port container terminal Co. LTD.`s40.5 t rubber-tyred container crane as research object, calculating the specific parameters of energy recovery system, and design the Buck/Boost DC - DC converter, DSP controller and IGBT driving circuit. In the process of fall and rise of hoist crane, the design realizes that it uses super capacitor to charge and discharge the system, which can effectively store the feedback energy produced during the decline of the hoist crane and discharge in the rise process, saving energy.This paper design a bidirectional DC - DC converter with super capacitor set as energy storage unit, and proposes a buck-boost circuit to realize the bidirectional flow of energy. The circuit uses closed-loop control strategy to make sure that it has stable output voltage, and adopt PWM control mode. At the same time, the paper design the protection circuit for super capacitor over-voltage, under-voltage, and the limited charging maximum current circuit.The paper has designed the detail strategy and made simulation with PSPICE, proving the feasibility of this design.