Hybrid Solar Inverter With Low Frequency

TG series pure sine wave hybrid solar inverter with off grid 

     Based on grid-tie and grid-off single phase full bridge inverter， a large signal fast modeling and simulation method for single phase DC/AC inverters is proposed． Large signal mathematical model for loop gain and controller design could be obtained with the proposed theoretic calculation method． The proposed averaging method preserves origin inverter circuit， such as branch middle point and ground point． It helps inner circuitry， terminal voltages and currents to be observed． Therefore， it is very suit for system simulation with multi converters． And it is predicted that the proposed general method is not restricted by inverter topologies and control approaches．

    Generally， droop control is used to achieve power distribution in microgrid， but it is easily to produce oscillation under disturbances． Adding a power differential term in droop equations is an effective way to suppress the oscillation． microgrid small-signal models of the conventional droop control and the power differential droop control are established． The small- signal analysis is presented to identify the relationship between the controller parameters or the line parameters and the system stability． And the methods for selecting control parameters are summarized． Then， the sensitivity analysis is presented to contrast the degree of participation of state variables in the low-frequency modes． And the association between the line parameters and the participation factors is studied． The conclusion is that the system damping increases with the increase of length or impedance ratio of line． And the dominance of eigenvalue on each inverter source is easy to change． Finally， simulation results in different conditions are used to verify these.

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