Bidirectional SPWM inverter rectifier battery charging and discharging maintenance device

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Bidirectional SPWM inverter rectifier battery charging and discharging maintenance device [Copy link]

Bidirectional SPWM inverter rectifier battery charging and discharging maintenance device

Lead-acid batteries are one of the most widely used energy storage components, such as in post and telecommunications, communications, and power sectors. As a backup emergency energy source, batteries are one of the essential components to ensure the normal operation of the system.

When used as a backup power source, under normal circumstances, the battery operates in a floating charge state. As the floating charge time accumulates, the battery plates will become passivated, which may damage the battery in severe cases. Therefore, monitoring the battery working status and regularly performing balanced charge and discharge maintenance is one of the essential means to extend the battery life and ensure the normal operation of the battery.

For battery manufacturers, each battery needs to undergo three charges and two discharges during the production process for aging and performance testing. Therefore, battery charging and discharging equipment is essential.

At present, the discharge maintenance of large-capacity batteries is usually carried out in two ways: one is to discharge through a series load resistor, and the electric energy stored in the battery is dissipated in the heat of the high-power resistor. Therefore, each maintenance work requires a large amount of electric energy, and the change of the battery voltage must be monitored in time to prevent over-discharge. The discharge current control is also inconvenient; the other is to use thyristor active inverter mode for discharge maintenance. This method feeds electric energy to the power grid to achieve energy saving and consumption reduction. Although this method can return energy to the power grid to save energy, the current waveform fed back to the power grid is a square wave, which contains a large number of high-order harmonic components, causing harmonic pollution to the power grid. In addition, the electromagnetic noise is large during operation, and the grid-connected power factor is also low, which will lose a large amount of reactive power.

With the development of power electronics and computer technology, the use of advanced SPWM bidirectional rectifier inverter technology can realize the charge and discharge control of battery packs. The device using this technology will not produce any harmonic pollution to the power grid during charging and discharging. The grid-connected current waveform is a perfect sine wave, and the power factor can be controlled to 1. In addition, it has low noise during operation, small size and high efficiency. Because it uses advanced computer control and management, it can meet the needs of various users, and has the optimization setting control of battery charge and discharge curve, which helps to extend the service life of the battery and facilitates the production and management of the battery. It can be greatly improved in terms of energy saving and consumption reduction.