In the DC power system of the unwatched transformer substation, the battery charger is one of the key devices. The stability of its performances directly affect the stability of DC power system. In the paper, using the computer technologies and the real-time Ethernet technology to communicate with the battery charger monitor to achieve remote monitoring technology of the performances of the battery charger. It can not only remote monitor the operations and fault states of the battery charger on line, but also remote sensing the ripple factor and the stabilized voltage precision when the battery charger is under the states of the floating charge and the constant voltage equalizing charge, at the same time remote sensing the stabilized current precisions when the battery charger is under the stage of constant current equalizing charge, and the characteristics of equalizing current when the battery charger is in operation. So the remote monitoring technology of the performances of the battery charger is very important in the transformer substation.
In this paper, using current advanced computer and real-time Ethernet technologies to design a set of high performances’ DC power dynamic management system for digitalized transformer substation. In the system, the operation states and fault conditions of DC power system can be remote monitored and controlled, the state informations of the feeder switches are real time displayed, the state transformations of DC generatrices are remote controlled, the states of equalizing charge and floating charge of the battery charger are remote controlled and remote transformed, the parameters of the battery charger are remote set, etc. In addition, the operation modes of the whole DC power system in the transformer substation are shown by way of simulation map installed in the upper management machine. This dynamic management system greatly contribute to the construction of unwatched, intelligentized, digitalized transformer substation.
In order to meet the demands of practical, convenient and quick charge requirements, a mathematical model of a certain type of vehicle starting lead-acid battery is established. Using the method of circuit analysis, the model parameters are identified by the known test data. In addition, battery charge model is simulated in each charge stage using the intelligent three-stage charge method, simulation waveform and test waveform fit very well, absolute errors between them reach to 10-6. Simulation results show that the mathematical model and its analysis method is proper for the charge characteristics of vehicle starting lead-acid battery. This has a good guidance to design intelligent charger and extend the battery life.
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