Figure 1.

Lead-acid battery working state diagram (a)Diagram of charging (b)Diagram of discharging"

Figure 2.

Third-order dynamic electrical model"

Table 1.

Values of internal parameters of lead-acid batteries"

Figure 3.

Structure diagram of battery simulation model"

Figure 4.

The topology diagram of three-phase grid-connected inverter main circuit"

Figure 5.

Three-phase inverter equivalent circuit structure diagram"

Figure 6.

Schematic diagram of inverter feedforward decoupling"

Figure 7.

Inverter voltage and current double closed loop control"

Figure 8.

The diagram of voltage space vector"

Table 2.

Correspondence between function value y and sector"

Table 3.

Action time of basic vector of different sectors"

Table 4.

Switching time assignment table for different sectors"

Figure 9.

The state of health of the battery when the remaining capacity of the battery is 30%"

Figure 10.

The internal resistance of battery when the remaining capacity of the battery is 30%"

Figure 11.

The terminal voltage of battery when the remaining capacity of the battery is 30%"

Figure 12.

The state of health of the battery when the remaining capacity of the battery is 60%"

Figure 13.

The internal resistance of battery when the remaining capacity of the battery is 60%"

Figure 14.

The terminal voltage of battery when the remaining capacity of the battery is 60%"

Figure 15.

The state of health of the battery when the remaining capacity of the battery is 90%"

Figure 16.

The internal resistance of battery when the remaining capacity of the battery is 90%"

Figure 17.

The terminal voltage of battery when the remaining capacity of the battery is 90%"

Figure 18.

Battery current changes"

Figure 19.

Voltage of direct current generatrix"

Figure 20.

Grid connected current"