A charging and discharging control system and method

Abstract

The invention discloses a charging and discharging control system, which includes multiple bidirectional DC-DCs, a phase sequence control unit, an energy storage unit, an energy storage controller, a charge discharge unit and a bidirectional AC-DC; Charge and discharge control method: the phase sequence control unit detects whether the bidirectional DC-DC is installed in place; the energy storage controller controls the bidirectional DC-DC to sample the voltage of the energy storage unit under test, and the phase sequence control unit checks the working status of each bidirectional DC-DC Make settings; the energy storage controller samples and monitors the bus voltage and current to determine whether the voltage meets the requirements. If it does not meet the requirements, the phase sequence control unit adjusts the bidirectional DC- The number of DCs and the number of bidirectional DC-DCs in the discharge state until they meet the requirements. The invention greatly improves the charging and discharging test efficiency of the tested energy storage unit, reduces the cost of the tested unit's charging and discharging test, minimizes the impact on the power grid, and has high safety.

Description

technical field [0001] The invention belongs to the technical field of charging, and in particular relates to a charging and discharging control system and method. The invention is suitable for switching power supply circuits. Background technique [0002] In the production process of batteries or capacitors, it is often necessary to perform charge and discharge tests on batteries or capacitors to test parameters such as battery or capacitor capacity, charge and discharge time, and current. The traditional charging test method is to use bidirectional AC-DC (Dual Alternate Current to Direct Current Convertor), which takes power from the grid to convert AC to DC, and then converts it to the charging voltage allowed by the battery or capacitor through bidirectional DC-DC for charging and discharging. During the test, the charge of the battery or capacitor is absorbed by the bidirectional DC-DC and then connected to the load, or this part of the charge is further processed by t...

AI Technical Summary

Problems solved by technology

This method has obvious disadvantages. For a large-capacity battery or capacitor that is fully charged, it takes a long time to discharge it when it is connected to a load. The next round of charge-discharge test will significantly reduce the test efficiency, and let the load absorb energy. A large amount of electric energy is wasted, and the next round of charging and discharging tests still needs to be powered from the grid. This test method is very costly

On the other hand, during the discharge test, although the charge of the battery or capacitor can be returned to the grid, improper handling may bring "pollution" to the grid. In severe cases, electrical equipment and power facilities may be damaged due to grid voltage fluctuations

The traditional method has the problem of low efficiency due to the lack of quantitative analysis of charging and discharging

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