Diesel-electric hybrid power ship propulsion system and energy management method of diesel-electric hybrid power ship propulsion system

Abstract

The invention discloses a diesel-electric hybrid power ship propulsion system and an energy management method of the diesel-electric hybrid power ship propulsion system. The diesel-electric hybrid power ship propulsion system comprises a main diesel engine, a propeller, an electricity generating electric motor, a gearbox, an energy storage device and an energy management module, wherein a charging inversion all-in-one machine is arranged between the electricity generating electric motor and the energy storage device; and the energy storage device comprises a super capacitor, a storage battery and a power distribution unit. The energy management method comprises the steps of obtaining the required power P and the energy storage device state{SC, BA} and selecting the operation mode according to an operation mode judging table in accordance with the energy storage device state{SC, BA}. The diesel-electric hybrid power ship propulsion system and the energy management method of the diesel-electric hybrid power ship propulsion system have the advantages that the ship power demand is softened; the proper propulsion system operation mode is selected according to the demand power and the energy storage device state, so that the main diesel engine works in the optimum efficiency interval to the greatest degree; the fuel economy is good; and the energy utilization rate is high.

Description

technical field [0001] The invention relates to a diesel-electric hybrid ship, in particular to a diesel-electric hybrid ship propulsion system and an energy management method thereof. Background technique [0002] Engineering vessels such as tugboats and dredgers are widely used in port operations. When choosing a diesel engine, it is often necessary to configure it according to the maximum power demand, which causes the diesel engine to work in a low-load area most of the time. The problem is that the fuel economy is poor. , poor emission performance. Moreover, most of these ships work in offshore waters. Compared with ocean-going ships, they are subject to stricter emission regulations, and it is urgent to improve their emission performance. [0003] The reason for the above problems is that the ship's energy system is relatively rigid, there is no energy storage element, and the propulsion energy is only generated by the diesel engine. By adding the energy storage devi...

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Problems solved by technology

[0007] Chinese patent application, application number 201310264651.7, an invention patent application titled "Energy Management of Hybrid Electric Ship Propulsion System", discloses an energy management strategy for hybrid electric propulsion ships, although it involves supercapacitors and lithium batteries, but The energy management strategy is not designed according to the characteristics of different energy storage devices

The existing problem is that the structure is complicated, and the invention only uses the storage battery as the energy storage device, which cannot meet the requirements of high current and short time charging and discharging.

[0009] Chinese patent, patent number ZL201220370587.1, a new utility patent titled "Ship composite energy device and ship equipped with composite energy device", discloses a marine composite energy device and a ship equipped with composite energy device, but only discusses The application of supercapacitors and batteries in the ship power grid is discussed, and the role as auxiliary propulsion energy is not covered, and the method of managing supercapacitors and batteries is not involved

[0010] To sum up, although the above-mentioned patents involve the application of energy storage devices in ships, none of them have improved the shortcomings of the aforementioned poor working characteristics of diesel engines, nor have they fully applied energy storage devices.

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