The invention relates to the field of power electronics, and discloses a grid-connected charging and discharging switching method, device and system and a storage medium, which are used for improving the switching efficiency. The grid-connected charging and discharging switching method comprises the steps that real-time power of a direct-current side circuit and real-time power of an alternating-current side circuit are monitored, direct-current side power and alternating-current side power are obtained, the output power of the grid-connected charging and discharging switching system is reduced in response to a grid-connected charging and discharging switching instruction, and the output power is the direct-current side power or the alternating-current side power. When the direct-current side power and the alternating-current side power are both smaller than a threshold value, charging and discharging control level time-sharing switching is conducted on the bus capacitor through the alternating-current side circuit and the direct-current side circuit, when the grid-connected charging and discharging switching system completes charging and discharging control level time-sharing switching, whether the voltage of the bus capacitor is stable or not is judged, and if not, the grid-connected charging and discharging switching system is started; if yes, the bus capacitor is controlled through the switched charging and discharging control level until the voltage of the bus capacitor is stable, and if yes, the output power of the grid-connected charging and discharging switching system is increased until the output power is equal to a preset value.

    本发明涉及电力电子领域,公开了一种并网充放电切换方法、装置、系统及存储介质,用于提高切换效率。并网充放电切换方法包括:监控直流侧电路和交流侧电路的实时功率,得到直流侧功率和交流侧功率,响应于并网充放电切换指令,减小并网充放电切换系统的输出功率,输出功率为直流侧功率或交流侧功率,当直流侧功率和交流侧功率均小于阈值时,通过交流侧电路和直流侧电路对母线电容进行充放电控制级分时切换,当并网充放电切换系统完成充放电控制级分时切换时,判断母线电容的电压是否稳定,若否,则通过切换后的充放电控制级对母线电容进行控制,直至母线电容的电压稳定,若是,则增大并网充放电切换系统的输出功率,直至输出功率等于预设值。


    Access

    Download


    Export, share and cite



    Title :

    Grid-connected charging and discharging switching method, device and system and storage medium


    Additional title:

    并网充放电切换方法、装置、系统及存储介质


    Contributors:
    DOU CHONG (author) / CHANG RENHE (author) / WANG TENGFEI (author) / CHEN QIAODI (author) / WANG ZICHEN (author)

    Publication date :

    2024-02-23


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



    Battery charging and discharging method, charging and discharging device, storage medium and charging and discharging system

    GE RUI / ZHOU SHUO / YUAN WENJING et al. | European Patent Office | 2024

    Free access

    CHARGING/DISCHARGING CONTROL METHOD, CHARGING DEVICE, AND STORAGE MEDIUM

    WANG CHAO | European Patent Office | 2025

    Free access

    CHARGING/DISCHARGING CONTROL METHOD, CHARGING DEVICE, AND STORAGE MEDIUM

    WANG CHAO | European Patent Office | 2023

    Free access