Ship Power System Power Management Method Study

In actual operation, due to fighting corruption, operational errors or equipment failuresand other problems, the ships’ power system may be running on non-normal states, whichseriously threaten the system stability and reliable operation. At the same time as theincreased use of pulsed power systems, will also affect the stability of the ships’ powersystem operation. Thus, in the early stages of the manufacture of ships, rational planning ofship energy management program, to make the program both to meet the safe operation ofpower systems, but also to meet future electricity load growth needs; meanwhile, detectingand controling the power of the ships’ power system, and to ensure the safe operation ofships. These are very necessary for he safe operations of ships’ power system.This thesis presents a flow analysis algorithm which based on the ships’ power system,the thesis also deals mainly with a power management system which based on DSP (DigitalSignal Processor) and suited for shipboard environment. With the powerful data processingand intelligent function chip, the system can manage the power of the regional powersystem extremely well. So it can provide accurate proof in testing shipboard powermanagement.A modified forward/backward sweep algorithm for shipboard power system load flowcalculation is proposed in this thesis, which is derived from the traditional three-phasebackward/forward power flow method for distribution network. Firstly, three-phase modelsfor shipboard power system elements are established according to the features of SPS.Based on this, the backward/forward power flow method for radial distribution network isextended in order to deal with PV node and transformer model. For weakly mesheddistribution network, a new three-phase power flow method based on the superpositionprinciple is presented. The weakly meshed network is firstly divided into two networksusing the superposition principle: one is the pure radial network and another is the puremeshed network. Three-phase power flow is solved separately on both the networks. Thesolutions are superposed together, and the final power flow solution is obtained by repeatingto solve the power flow of the two networks. The presented method is tested by a typicalshipboard power system, and the power flow solution is given. The results indicate that theproposed method is effective.According to the characteristics of ships’power system, designing the hardware and software of energy management system for the regional distribution system. The hardwaredesign includes filter circuit, signal conditioning circuit, optocopler isolation circuit, A/Dsampling circuit control circuit, CAN communication circuit and DSP minimum system.The software design includes the initialization program, A/D sampling program, dataprocessing algorithm program, CAN communication program and man-machine interfaceprogram. Taking into account the differences between the ship power grid and land powergrid, this system focused on strengthening the anti-jamming design and the data stabilitytransmission design. Finally, overall debugging and acquired the data.Experiment revealsthat the proposed algorithm can be fast and efficient analysis and management of ships’power system, the designed measurement, control,communicatios for this system is stableand reliable, and this system has good prospects.