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In single-phase uninterruptible power supply (UPS) applications, it is well known that the AC side instantaneous power is not constant by nature. The resulting input current from the DC source side will inevitably contain low frequency ripple components that may largely deteriorate the system performance in terms of efficiency and reliability. In order to solve this issue, this paper presents a dual-mode...
This paper presents a transformerless inverter topology, which is capable of simultaneously solving leakage current and pulsating power issues in grid-connected photovoltaic (PV) systems. Without adding any additional components to the system, the leakage current caused by the PV-to-ground parasitic capacitance can be bypassed by introducing a common mode (CM) conducting path to the inverter. The...
In this study, repetitive current controllers operating in either the mixed or stationary frame are proposed for high-precision reference tracking and disturbance rejection of power converters. Both controllers use a proportional-resonant regulator in the stationary frame for regulating the positive- and negative-sequence fundamental currents, which are known to directly influence the flow of active...
Uninterruptible power supplies (UPSs) are commonly used to supply quality power at a well-regulated voltage to all nonlinear and unbalanced loads. To achieve that, a number of control schemes have since been proposed with the traditional double-loop linear control scheme being more popular because of its simple conceptual formulation and physical implementation. Despite of its popularity, the harmonic...
Precise controlling of current produced by power converters is an important topic that has attracted interests over the last few decades. With the recent proliferation of grid-tied converters where the control of power flow is indirectly governed by the accuracy of current tracking, motivation to develop dynamically fast and accurate current controllers is even more intensive with more features expected...
In this paper, a mixed-frame and a stationary-frame time delay current controller are proposed for high precision reference tracking and disturbance rejection of power converters. In particular, the controllers use a proportional-resonant regulator in the stationary frame for regulating the positive and negative-sequence fundamental currents, which are known to directly influence the flow of active...
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