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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...
The hybrid power system consisting of new energy inverters and diesel generators has become a typical case of independent power systems in remote areas. Aiming at the problem of generator overload caused by sudden load applying in such systems, this paper proposes a novel emergency control strategy which increases the inverter output power according to the changing rate of system frequency. This control...
In this work, three-phase single stage grid-connected photovoltaic system using current control inverter is simulated using Matlab/Simulink. To deal with varying irradiance conditions, the incremental conductance MPPT has been used, however in order to improve the power quality a three-level (NPC) inverter based SVM control together with LCL filter has been used. The main result of the project is...
In this study, the authors aim to develop the interconnection inverter called “Proton” used for the “Digital Grid” which has been proposed as a new electric power grid. The authors propose an islanding detection function and fault ride thorough (FRT) function of interconnection inverter. In the proposed method, the output current is controlled to be proportional to the voltage of the grid. During...
The classic model predictive control presents a variable switching frequency which could produce high ripple in the controlled waveforms or resonances in the input filter of the matrix converter, affecting the performance of the system. This paper presents two model predictive control strategies with fixed switching frequency operation which allow a better performance of the system. The operation...
We propose a novel framework for multistep predictive current control for induction machines and 3 Level-Neutral Point Clamped Inverter. To ensure low computational complexity The multistep prediction horizon is implemented using a sphere decoding algorithm. The DC-link balancing is guaranteed by adding a linearized DC-link balancing term. In order to obtain high accuracy, the linearization is performed...
In this paper an indirect model predictive current control strategy is proposed. The proposed method simplifies the computational cost while avoiding the use of weighting factors. Weighting factors are an issue for model predictive control in a direct matrix converter due to the large number of available switching states and necessity to control both input and output sides of the converter.
This paper describes a method of deriving frequency characteristics of PMSM current control system based on Model Predictive Control (MPC). MPC controller predicts the current behavior using the mathematical model of PMSM and directly selects the optimal switch state based on evaluation of these predicted results. So, we have focused the possibility of MPC, which makes it possible to drive machines...
Model Predictive Control (MPC) method offers advantages of easy implementation and fast dynamics. However Model predictive control method has variable switching frequency, which makes design of the output filter difficult for power converter. Despite the problems of MPC algorithm, there are little methods to fix the switching frequency using MPC algorithm in power converter. Therefore, this paper...
In electrical systems parasitic capacitances are forming resonant circuits in combination with the inductances of the system. Each inverter switching operation is stimulating common-mode oscillations in these resonant circuit which can lead to critical overvoltages at the motor terminals. These voltages could damage the insulation system of the electrical machine and reduce the service life of the...
This paper proposes a discontinuous current mode (DCM) feedback current control for a single-phase grid-tied inverter in order to minimize a LCL filter without worsening total harmonic distortion (THD) of a grid current. In DCM, there are two nonlinearities occurring in the transfer functions; the first non-linearity occurs in the duty-ratio-to-current transfer function which worsens the current command...
The accurate control of the line current, robust and dynamic behaviour even under distorted grids and the behaviour on other faults are important requirements for grid connected inverter systems. This paper presents a sensorless grid voltage determination system in combination with an direct current control method optimized for multilevel inverters.
This work presents a dead-time compensation technique for robust predictive current control of grid-connected voltage source inverter. Among current controls, dead-beat predictive controllers are one of the fastest, but are extremely sensitive to inconsistencies between the model and the actual plant. Dead-time modifies the plant model and is one of the main sources of distortion in high dynamic range...
In this paper, a new control strategy for seamless mode transfer of grid-connected single-phase inverter is proposed. Generally, power flow between DC side and AC side is controlled by current reference of grid-connected inverter in d-q synchronous rotating frame. Therefore, it is general to reverse the current reference if the direction of power flow is changed. However, it causes a rapid change...
In dq-frame current control scheme for single-phase grid-connected inverters, an orthogonal signal generation (OSG) block is required to generate a virtual orthogonal signal. The OSG block makes the control system complicated and introduces extra disturbance, which deteriorates the dynamic performance. This paper presents a simplified dq-frame current controller for single-phase grid-connected inverters...
Permanent-magnet synchronous motor is one of the most suitable choices in urban rail transit. On this occasion, the traction inverter need to keep low switching frequency in order to reduce switching losses, and six-step operation is needed to obtain the maximum output voltage. In order to achieve the multi-objective control and deal with a variety of constraints, model predictive control method is...
A large number of distributed generations (DGs) connected to the distribution network have a significant impact on the stability of the power system due to their low inertia. Meanwhile the DGs are generally linked to the end of the distribution network, where power quality problems are very common. This paper applies virtual synchronous generator (VSG) technology in three-phase four-leg inverter....
This paper presents the filter setting for expand the operation range of IPMSMs in overmodulation region of inverter. To operate IPMSMs in the overmodulation region, it is necessary to deal with harmonics components. In this paper BSF is utilized to suppress the harmonic components, and its setting method is mentioned. The operation range in the overmodulation region is expanded appropriately by setting...
Solar Panel Companion Inverter (SPCI) has been proposed as an H-bridge inverter embedded with a PV module. Each inverter converts the DC voltage output of the module, to a quasi-square wave voltage with variable pulse width. When these voltages are aggregated across multiple panels connected in a series string, they synthesize an AC waveform that can be interfaced with the power grid. The inverter...
The boost inverter can be an alternative grid interfacing power converter for renewable energy sources since it can generate an AC voltage whose peak value could be greater than the DC voltage. When it connects to the grid, high quality output current is required, therefore, grid current is hoped to be controlled directly. A novel control strategy to control grid current with only one closed control...
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