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Single-phase two-stage inverters generally use an intermediate capacitor to buffer the power imbalance between DC input and AC output. However, the resultant low-frequency voltage ripple on this intermediate capacitor may produce low-frequency ripple at the source side, especially when the front-end dc/dc converter operates in continuous conduction mode (CCM). Some common solutions to reducing this...
Variable carrier single rate deadbeat control method for low carrier frequency was proposed. In the large capacity inverter system, the carrier frequency range is limited to relatively lower frequency range, the trade off between the control accuracy and the efficiency should be considered. Digital hysteresis control was applied to the inductor current, suitable carrier frequency was adopted in every...
This paper is focused on the possibilities of implementing an auto-adaptive control, without a phase-locked loop circuit, for the operating frequency in an induction heating system with single-phase voltage source inverter and resonant L-LC load. Based on the phasor diagram of the equivalent resonant load under resonance condition, three possibilities have been identified to express an error to be...
The paper presents the energetic performances of a system used for drying of current transformer from 110 kV Ciungetu power station. In fact, the drying process is based on an induction heating system that contains a half-controlled rectifier and a voltage source inverter that operates with resonant load. Two frequencies are taken into consideration for the inverter control. The former is the resonance...
One important type of power conditioning systems in photovoltaic (PV) application is the string inverter which requires small input voltage and current ripple. In addition, high-efficiency and high-power density are also the critical requirements for string inverter system. So the input voltage and current ripple cannot be easily rejected by paralleling large conventional electrolytic capacitors in...
This paper presents a high power density 2 kW single-phase inverter, with greater than 50 W/in3 power density and 90% line-cycle average efficiency. This performance is achieved through innovations in twice-line-frequency (120 Hz) energy buffering and high frequency dc-ac power conversion. The energy buffering function is performed using an advanced implementation of the recently proposed stacked...
Total Harmonic Distortion (THD) of a voltage or current signal causes power system losses, apparatus overheating and increases the power bills. This paper proposes the design and implementation of a transformer less single-phase inverter system that produces an output voltage of desired magnitude and frequency at a very lower THD. In ‘general inverter system’, a lower DC voltage is inverted into lower...
Variable carrier frequency control of PWM inverter based on deadbeat control using SoC-FPGA based hardware controller was proposed. The inductor current was controlled using digital hysteresis method and the output current was controlled using deadbeat control with disturbance compensator. As the result, the control accuracy and the efficiency of the inverter can be adjustable with superior tracking...
The requirements of generating various low frequency voltage waveshapes are usually catered by using linear amplifiers, which results in low overall efficiency. High frequency voltage source inverters with low pass filter at the output are not suitable for these applications, as it is difficult to produce waveshapes containing high frequency components, and variation in frequency. A Boost Inverter...
This paper presents a new photovoltaic (PV) micro-inverter topology. The topology is based on a partial power processing resonant front end dc-dc stage, followed by an interleaved inverter stage. The input stage provides high efficiency, and flexibility of design for wide input voltage range and the output stage provides an effective switching ripple of twice the PWM frequency, which reduces the output...
A controllable output impedance method for parallel inverters system is proposed in this paper. The control strategy uses LCL filter in output side and add a current loop to adjusting the output current of the inverter bridge. With this modification, the output impedance of inverter is compensated to a specific value then the difference of line and filter impedance can be neglected. Redesigned output...
Variable carrier frequency control of PWM inverter based on deadbeat control using SoC-FPGA based hardware controller was proposed. To adopt to the fault ride through (FRT) conditions, deadbeat control was introduced to control the output current, and variable carrier method was applied to achieve high efficiency without the deterioration of controllability of the output current. The disturbance compensator...
Due to power time-varying characteristic of a single phase photovoltaic (PV) grid-connected inverter in grid side, its front-end dc/dc converter tends to draw a large ac ripple current with double grid frequency, which would decrease maxim power point tracking performance of PV side. A novel method is proposed for the low frequency input current ripple analysis of a boost converter in a non-isolated...
This paper proposes a current control strategy with zero steady-state tracking error for grid-connected boost-inverters. Two boost converters are controlled separately to achieve both output current tracking and balanced output voltages. Based on cascading control and feedback linearization, the inner and outer-loop controllers are derived combining the inversion of boost converter model and the output...
In this paper, a current-control strategy is proposed for voltage-source inverters in microgrids. The main objective of the proposed controller is to inject a clean sinusoidal current to the grid, even in the presence of nonlinear/unbalanced loads and/or grid-voltage distortions. The repetitive control technique is adopted because it can deal with a very large number of harmonics simultaneously. The...
This paper explains the comparison of the controllers that suitable to be used in single phase inverter for studying purposes. This controller can easily been developed and tested using MATLAB/Simulink and implemented on the real time application. The controllers that have been developed are the Proportional Integration (PI)-dq controller, Proportional Resonant (PR) controller, and PR- Repetitive...
This paper presents a dual-buck full-bridge inverter (DBFBI) with the sinusoidal pulse width modulation (SPWM) and single current sensor. Shoot-through problem does not exist. All the power devices and filter inductors operate at each half line cycle, thus the efficiency can be increased. Only one switch works at high frequency when the reference current and the output voltage have the same polarity,...
This paper presents an improved control strategy for dual-buck full-bridge inverter (DBFBI) with single current sensor. Hysteresis current control is used in the DBFBI. The shoot-through problem does not exist. All the power devices and filter inductors operate at each half line cycle, thus the efficiency can be increased. Only one switch works at high frequency when the reference current and the...
A current-source inverter with variable frequency is proposed for the grid-connected photovoltaic generation system in order to improve power quality, reduce current harmonics and decrease the frequency of switches. Besides applying energy to grid in the form of alternative current output using full-bridge switches, this topological structure can also complete maximum power point tracking by changing...
Due to non-linear time-varying characteristic of a single phase DC/AC inverter, its front-end DC/DC converter tends to draw an AC ripple current at twice the output frequency, which may cause interaction issues (e.g. stability problem and input ripple current limit in distributed generation systems such as nor-grid-connected wind power system). A novel method is proposed for analyzing the behavior...
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