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This paper presents a new and simple voltage control strategy for three phase current source inverter (CSI) using finite-set model predictive control. The proposed method can ensure an interruptible power supply (UPS) for the local loads of an islanded grid connected CSI independently of the type of these loads. The control of the inverter's output voltages is performed using the discrete model prediction...
This paper presents an approach to completely eliminate common-mode voltage (CMV) of an AC motor fed by a three-level neutral point clamped (NPC) inverter. CMV is produced at the star point of an AC machine fed from the inverter. Its parasitic coupling with the motor frame has a negative effect on the motor itself and other equipment, particularly in underground environment. The proposed approach...
When the problem of the model predictive control cannot be solved, the control system will not work properly. A control strategy based on model predictive control and PI is proposed in this paper. The control strategy of the model predictive control and PI is applied to the three-phase off-grid inverter. Adaptability of the PI controller to the operating mode is improved and the dynamic performance...
This paper proposes an Extended State Observer (ESO) based predictive direct power control strategy for three-phase two-level grid connected power converters. The proposed control is in cascade structure which consists of two control loops, instantaneous power tracking loop (inner loop) and voltage regulation loop (outer loop). A proportional integral (PI) controller integrated with an ESO is designed...
An adaptive reference model predictive control (ARMPC) approach is proposed as an alternative means of controlling power converters in response to the issue of steady-state residual errors presented in power converters under the conventional model predictive control (MPC). Differing from other methods of eliminating steady-state errors of MPC based control, such as MPC with integrator, the proposed...
This paper presents an enhanced strategy for Direct Torque Control (DTC) combining artificial intelligent (AI) and predictive algorithms. The advantages of both methodologies are merged to solve the main problems of closed loop controlled induction machines (IM) and, in particular the drawbacks of the classical DTC. Predictive DTC (P-DTC) methods solve the problems of the high torque ripple and poor...
In this paper, a component efficient multilevel rectifier is modeled and controlled using Model Predictive Control (MPC) technique. The recently introduced Capacitor Tied Switches (CTS) converter structure features two distinct dc-load terminals which can operate at different voltage levels while experiencing high voltage levels at the ac-side terminals. The CTS converter structure inherits attractive...
This paper presents a model-based predictive control scheme for a dual-output Nine-Switch Inverter (NSI) with output filter. The conventional Pulse Width Modulation (PWM) method for NSI control is very complicated, it requires a multi-loop control scheme and implementation incurs high computational costs. Conversely, the proposed predictive control scheme is simple and controls two the three-phase...
In recent, microgrids have been considered as an economic and efficient way to integrate distributed renewable resources on the community level. However, the current and power sharing between each distributed generations, especially under heavy power demands and casualty conditions, is still an important issue. This paper presents a model predictive control approach for parallel-connected inverter-based...
This paper presents a model predictive control method applied to a single phase grid-connected inverter. The method uses a discrete-time model of the system to predict the future value of the load current by using all possible voltage vectors generated by the inverter. The voltage vector which minimizes a quality function is selected. Then, use the switch state deduced by the select voltage vector...
Dead time elimination of voltage source inverters (VSI) becomes critical for modern current controlled applications with increased requirements regarding the magnitude accuracy and harmonic distortion of an output waveform. Recently many approaches are used to compensate the dead time both in open or close loop control systems. All these schemes require additional circuits or computational effort...
Buck converters are ubiquitous in modern electronics, providing well regulated supply voltage to processing units and other integrated circuits, as well as to many other loads. In many applications, e.g., power supplies for processors, the reference for the output is piecewise constant, and typically the power converter must effectively reject disturbances due to fast changes in the load behavior...
The power conversion from variable AC voltage into a desired AC voltage with fixed magnitude and fixed frequency is attracting more attention especially in case of grid-connected wind generation system. Indeed, the Direct Matrix Converter (DMC) can be used as a suitable solution for such AC/AC conversion to fulfill the requirement of the output voltage with desired magnitude and frequency. This paper...
This paper deals with a form of long-term voltage instability which can arise from uncoordinated control actions taken by interacting voltage controllers. An effective coordination paradigm, based on Model Predictive Control (MPC), is proposed in order to properly coordinate local control actions taken by Load Tap Changing transformers (LTCs). This coordination is achieved by exchange of information...
Conversion from variable ac voltage into fixed voltage and fixed frequency ac voltage is essential especially in case of grid-connected wind generation system. Direct matrix Converter (DMC) provides a solution for such ac/ac conversion for desired voltage and frequency. Five to three phase matrix converter developed in this paper is proposed to convert five-phase input voltage into three-phase voltage,...
This paper makes a detailed analysis on the principle and characteristics of Model Predictive Control (MPC) applied to three-phase half-bridge active rectifier. Model predictive control has merits of forecast and real-time optimization. MPC controller computes the optimal space vector of input voltage to the PWM rectifier in the dq frame and then this desired space vector is modulated via space vector...
The simulation model of microturbine generation system has been developed according to the dynamic feature of microturbine. Adopted predictive control theory to control the DC capacitor voltage of the generation system. The response of predictive controller at the load disturbance has been compared to that of traditional PI controller. The simulation results show that the predictive controller has...
In this paper, a finite control set predictive control in cascade with PI controller is presented for a three-phase neural point clamped boost rectifier. The control algorithm consists of a finite control set predictive control for inner current loop in synchronous reference frame and a PI voltage control for the outer-loop system. There are two reference signals for this cascade controller, one being...
The use of finite state model predictive control (FS-MPC) is investigated for an AC-to-AC converter with LC output filter for voltage regulation applications. The equivalent input inductance of the source is included in the model of the converter which results in a second equivalent LC filter at the input. This introduces oscillations in the system. FS-MPC is used to add control to the input without...
Matrix converters are capable of managing bidirectional power flow while fully controlling the source currents and load voltages. The topology is characterized by its reduced size and weight compared to Voltage Source Inverters because there is no DC link stage. Recently, diverse control methods have been proposed for the direct matrix converter. In particular, the finite states model predictive control...
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