Virtual internal resistance adjusting device for equalization between battery clusters
A technology for regulating devices and battery clusters, which is applied in the field of electric power and can solve problems such as increased differences, weakened direct parallel connection capabilities of battery clusters, and battery clusters that cannot be fully charged.
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Embodiment 1
[0030] refer to Figure 1-9 , a virtual internal resistance adjustment device for balancing between battery clusters, including a plurality of battery clusters 2, the battery clusters 2 are connected to the DC bus 1 through an adjustment device 5, and the adjustment device 5 includes a bypass switch 6 and the voltage regulating DC converter 7, the bypass switch 6 and the voltage regulating DC converter 7 are connected in parallel; the DC bus 1 is connected to the energy storage converter 3, and the energy storage converter 3 is connected to the grid 4 The DC power is converted into AC power through the energy storage converter 3 and connected to the grid 4 to realize the energy exchange between the battery cluster 2 and the grid 4 . When the voltage-regulating DC converter 7 is not required to work or the voltage-regulating DC converter 7 is abnormal, the bypass switch 6 is turned on to directly connect the battery cluster 2 to the DC bus 1. At this time, the virtual internal ...
Embodiment 2
[0061] In this embodiment, an IGBT switch tube (not marked in the drawings) is connected in series with the voltage regulating DC converter 7, which is used for the us-level protection of the short circuit of the DC bus 1, and can also be used for the instantaneous overshoot of the DC bus 1 pressure protection. The IGBT switch tube remains on during operation. Although there is only a turn-on loss, the fixed loss is also large under high-power conditions, which has certain requirements for overall heat dissipation. In addition, the IGBT switch tube is connected in series in the main circuit without a buffer link, and the impact resistance is poor. Then, when a capacitive load is put on the DC bus 1, there is a protection shutdown, or the shutdown is not timely and the device is damaged.
[0062] IGBT (Insulated Gate Bipolar Transistor), Insulated Gate Bipolar Transistor, is a composite fully-controlled voltage-driven power semiconductor device composed of BJT (Bipolar Transist...
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