Load current calculating method and apparatus, and bidirectional inverter

[0052] see figure 1 , figure 1 is a schematic flowchart of a load current calculation method provided by an embodiment of the present invention. Such as figure 1 As shown, the method is applied to a bidirectional inverter, such as a bidirectional grid-connected inverter, the bidirectional inverter is connected to the grid and the load, and the bidirectional inverter includes: a first current transformer and a second current transformer transformer, the method comprising:

[0053] Step S10: detecting the instantaneous value of the inverter current through the first current transformer, and detecting the instantaneous value of the grid current through the second current transformer;

[0054] Wherein, the load is located between the bidirectional inverter and the power grid, the bidirectional inverter is connected to an energy storage battery, and the energy storage battery may be a combination of multiple batteries, that is, an energy storage battery pack, or battery pack, t...

[0072] see Figure 5 , Figure 5 It is a schematic diagram of a load current calculation device provided by an embodiment of the present invention. The load current calculation device 100 can be applied to a bidirectional inverter connected to a power grid and a load. The bidirectional inverter includes: a first current transformer as well as a second current transformer such as Figure 5 As shown, the load current calculation device 100 includes:

[0073] The instantaneous current value detection unit 10, the instantaneous current value detection unit 10 is used to detect the instantaneous value of the inverter current through the first current transformer and detect the instantaneous value of the grid current through the second current transformer;

[0074] The load current instantaneous value calculation unit 20, the load current calculation unit 20 is used to calculate the load current instantaneous value according to the inverter current instantaneous value and the grid...

[0082] Please also refer to Figure 6 to Figure 8 , Figure 6 It is a circuit topology diagram provided by the embodiment of the present invention; Figure 7 is a topology diagram of a bidirectional inverter provided by an embodiment of the present invention; Figure 8 It is a structural schematic diagram of a bidirectional inverter provided by an embodiment of the present invention.

[0083] Wherein, the bidirectional inverter may be a bidirectional grid-connected inverter, a string type bidirectional inverter, and so on.

[0084] Such as Figure 6 As shown, the bidirectional inverter 500 is connected to the energy storage battery 200, and the bidirectional inverter 500 is also respectively connected to the power grid 300 and the load 400, and the first current transformer 53 is arranged on the bidirectional inverter 500, The second current transformer 54 is also arranged in the bidirectional inverter 500, the second current transformer 54 is connected to the power grid 3...