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The performance of reactive power sharing in an islanded microgrid is significantly affected by feeder impedance, mismatch parameters and unbalanced local load. To reduce the negative impact of mismatched link impedance on reactive power sharing, the adaptive virtual impedance strategy for voltage compensation is proposed with paralleled inverters in an islanded mode. The on-line adaptive control...
This paper proposes an improved impedance (Z) source inverter topology. Compared to the traditional impedance-source inverter, it can reduce Z-source inverter device voltage stress significantly to perform the same voltage boost, and provides the controllable and stable output power in all load condition. The control strategy of the proposed Z-source inverter is exactly the same as the traditional...
To design the current controller for the grid-connected inverter (GCI), the grid is usually assumed as balance. Hence, the current controller performance gets worse when the grid is unbalanced. In this paper, a virtual inductor is proposed to suppress the effects of grid unbalances. Virtual inductor is an additional control algorithm that changes the system behavior as if there is a real inductor...
This paper investigates the fault behaviour of inverter-interfaced distributed generators in stand-alone networks. It is shown that the rapid transient response of the inverter control system allows its fault behaviour to be characterised by quasi steady-state equivalent fault models. The choice of inverter control strategy, control reference frame and the method of active current limiting dominate...
Inverter current limiting in islanded networks during unbalanced faults can cause voltage distortion. By using the control system to emulate a parallel impedance, this distortion can be avoided whilst current control is maintained and fault current is delivered to the fault. Experimental results from a 10kVA inverter system are provided to verify the theoretical analysis that has been developed.
A soft-switching inverter topology (the Class Phi ) is presented which draws dc source current through a transmission line or a lumped-network approximation of a distributed line. By aligning the inverter switching frequency just below the line's lambda/4-wave resonance, the Class Phi topology enforces odd-and even-harmonic content in its drain voltage and input current, respectively. The symmetrizing...
In this paper, a novel arc-suppression coil based on transformer theory is proposed. According to this theory, the reactance of the arc-suppression coil can be controlled exactly by controlling the current of secondary winding of the reactor, which is implemented by a single phase inverter. This fire-new arc-suppression coil has some excellent characteristics such as linear regulation capacity and...
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