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VOLTAGE ORIENTED CONTROL – SIMULATION

3.8 Grid modeling

Figure 3.45 : Grid connected converter

The aim of this part is to modify the model introduced in section “2.2.2 Mathematical model” (Figure 2.4) to simulate a grid connected converter. We are going to add the grid voltage and impedance Eg, Rg and Lg. A switch will be modeled with a resistor Rb (high value for an open switch, very small value for a switch closed). We can write four equations as below.

First equation : ig

1

(3.55)

Second equation : i

1

(3.56)

Third equation : Vc

1

(3.57)

Fourth equation :

(3.58)

With these four equations, we can establish the scheme Figure 3.47 to replace the simple grid model of Figure 3.46 (establish in section “2.2.2 Mathematical model” Figure 2.4).

Figure 3.46 : Simple grid model (phase A)

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