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An active power filter (APF) plays an important role in compensating the harmonic component of a nonlinear load current. In this paper, deadbeat control (DBC), which has high control performance and fast dynamic response, is used as a current controller for an APF. An improved DBC (Imp_DBC) is introduced to suppress the adverse effect of the current sampling error and to enhance the interference rejection...
An improved deadbeat plus plug-in repetitive control scheme is proposed for grid-connected three-phase four-leg inverters to achieve fast and accurate feed-in grid current tracking. Discrete-time mathematical model of the three-phase four-leg grid-connected inverter is developed. An improved deadbeat (DB) plus plug-in repetitive control (RC) scheme is proposed to reject periodic disturbances while...
A case study for designing the current control loop for single-phase inverters connected to weak grids is presented. The problems associated to the design of current control loop when highly distorted grid voltages are present and LCL filters are used to couple the inverters to the grid, are analyzed. Fourier coefficients decomposition is used to obtain an ahead-of-time version for the nonideal voltage...
Model Predictive Control approach is being extensively used by researchers in the power electronics area. Since its early introduction to the field, it has been regarded as a strategy fundamentally different to the classical control approaches, which makes it difficult to compare MPC-based schemes with the existing control schemes. This paper shows, that there exists a direct relationship between...
Distribution STATic synchronous COMpensators (DSTATCOMs) have been proved an effective approach to correct power quality in distribution network. With reactive component and harmonic component of load current detected independently, selective compensation mode can be realized. To improve the reactive compensation ability and harmonic suppression performance of a cascaded DSTATCOM, the fast-transient...
The grid-connected LCL-filtered inverter is widely used in distributed power generation systems based on renewable energies. Single inverter-side current feedback control only needs to sample one current to realize both current control and inverter protection. However, with single inverter-side current feedback control, the closed-loop system is under-damped or even unstable due to the digital control...
It is demonstrated that in grid-tied-inverter control, resonant integrators can be moved from the current loop to the input voltage filter allowing for better accuracy of voltage rms and frequency measurements whithout compromising controlability. Design of the input filter is discussed to ensure good performance and phase compensation and a robust feed-forward is built upon this filter that, together...
Conventional control strategies, used in shunt active power filters (SAPF), employ real-time instantaneous harmonic detection schemes which are usually implemented with digital filters. This increases the number of current sensors on the filter structure which results in high cost. Furthermore, these detection schemes introduce time delays which can deteriorate the harmonic compensation performance...
A nonlinear average current control method using only dc-rail current for three-phase power-factor-corrected (PFC) converters was introduced recently. This paper discusses the effects of dead-time, sector synchronization, input voltage harmonic distortion and sensing delay on its control performance. A dead-time compensation scheme without additional sensing requirement that is suitable to the nonlinear...
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