Inverter voltage outer loop current inner loop

How do you control an inverter?

Simple strategies focus on the direct control of a single variable, such as the output or inverter current (respectively at grid- or inverter-side of the filter) . A common approach comprises an outer control loop for capacitor voltage control and an inner control loop for the inverter current.

What are the disadvantages of a capacitor control loop?

A common approach comprises an outer control loop for capacitor voltage control and an inner control loop for the inverter current. The drawback of this strategy is that the output current may be sensitive to grid perturbations, because it is not directly controlled.

What control systems are used in LCL filtered inverters?

Available literature concerning the control systems of LCL filtered inverters focuses on variations of the deadbeat predictive control and the PI control. Proposed strategies vary with respect to the target of control and the structure of the inner and outer loops.

How can a single-phase inverter improve performance?

By establishing the mathematical model of the single-phase inverter, the current inner loop control can obtain rapid dynamic performance, and the voltage outer loop control can improve the steady-state performance of the system. Secondly, using the pole configuration method, the parameters of the double closed-loop PI can be obtained.