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An output filter design is presented for high bandwidth high power inverter in this paper. Various filter topologies are compared to eliminate the switching frequency components effectively while generating various output voltage waveforms up to 10 kHz without distortion. This ultimate design consists of an R-C series branch connected in parallel with the C of conventional L-C filter resulting in...
This paper proposed inverter circuit for low power applications that can generate AC output voltage at fundamental output frequency larger than input voltage without need to increase the number of power switches, several isolated DC source or capacitors and transformer. By applying appropriate duty cycle and PWM switching pattern to the circuit, the near sinusoidal output voltage can be realized with...
An increased research effort on the topic of unity-power-factor rectifiers has been lately noticed. In this paper two highly efficient three-phase buck-type unity power factor rectifiers are proposed to be studied: the conventional six-switch (single-stage) and its two-stage version, referred as the interleaved six-switch solution. They are in here compared in terms of efficiency and performances...
In this paper, two-level and three-level voltage source inverters (2/3L-VSIs) with popular pulse width modulation (PWM) methods are investigated in terms of their output (ac-side) voltage and current ripple spectral characteristics and waveform quality properties such as peak-to-peak ripple, rms ripple, and weighted total harmonic distortion. As the switching frequency and the filter size influence...
This paper proposes a generalized high power inverter scheme based on hybrid asymmetric cascaded topology with low frequency modulation index (FMI) control. Selective harmonic mitigation technique is combined with low order harmonic elimination control strategy for limiting the top 50 low order harmonics into the setting values, which reduces the size and weight of the output filter observably. The...
A flyback inverter in continuous conduction mode (CCM) operation has simple structure, high efficiency, and low cost. But, in CCM operation, the transfer function from the control input to the output current of the flyback inverter has right-half-plane zero, which causes slow and delayed response. To achieve fast response, Time-delay controller (TDC) is proposed, which consists of a linear controller...
The selection and sizing of the dc-bus capacitor for applications utilizing three-phase PWM operated voltage source inverters (VSIs), such as grid connected photovoltaic systems and motor drives are presented based on the spectral characteristics of the dc-bus current. The characterization is provided for two and three-level VSIs (2/3L-VSIs) for popular PWM methods with modulation index (Mi) and the...
High power conversion entails the necessity of converters interfacing with the grid which have both low losses and low harmonic content. For this purpose several topologies have been proposed, but, due to the restriction imposed on the switching frequency, these topologies often make use of complex multi winding transformers or large sinusoidal filters. These features increase cost, losses and reduce...
The most Grid-connected inverters for photovoltaic (PV) system use the three-level grid-connected inverter, which generates the three voltage level at the output of inverter. It can inject the sinusoidal current to utility grid through a set of filter as shown in Fig. 1. Even though, the three-level grid-connected inverter can be operated in high efficiency, but it still has some drawback, such as,...
In this paper the three-phase 7-level Packed U-Cell (PUC) converter has been employed as a shunt active power filter (APF) to compensate the load harmonics in a power network. Using multilevel converter as APF results in generating low distortion waveforms as well as operating in low switching frequency. A PI controller has been used to compensate the load harmonics and to correct the source side...
The matrix converter (MC) is an alternative ac-ac power converter by connecting directly input to output phases through bidirectional switches and without using any dc-link or energy storing element, therefore is called an all-silicon converter. Two topologies of matrix converter are established such as direct topology and the indirect topology. This paper is devoting to presents the topology of the...
In recent days in order to have effective utility of Renewable Energy (RE) Resources, they are being integrated to the Grid through a power converter. So, the grid side inverter control of RE systems is one of the main issues in power production units besides that, the voltages and the currents that are being feed to the grid must be free from harmonics and they should have the same phase angle as...
This paper presents a new idea to benefit of eliminated harmonics current by using a new topology of hybrid active power filter (HAPF) to compensate harmonics current to be sinusoidal in order to feed some loads. The design and simulation of a new three phase HAPF circuit using a shunt active power filter (APF) connected in parallel with a capacitor (C) line of a (LC) low pass filter (LPF) has been...
Harmonic distortion is often a challenge in marine vessel power systems due to the presence of large motor drives containing diode or thyristor rectifiers. Governing standards impose requirements on bus voltage Total Harmonic Distortion (THD) which can be demanding to fulfil. An attractive measure to reduce THD is to use 12-pulse rectifiers, as they are known to cancel the 5th and the 7th harmonic...
Over the last years, the two-level three-phase voltage source converters (VSCs) have received an increasing attention as an alternative to conventional thyristor converters. This is due to the universality of this topology having the full capability to operate as conventional voltage source inverters driving a three-phase AC machine as well as a grid-tied converter ensuring a bidirectional power flow...
In this paper a new single-phase five-level buck-boost active rectifier is introduced called capacitor tied switches (CTS). The proposed rectifier has two independent DC outputs that can be connected to two different loads. Different switching states and the average mode of the proposed topology are analyzed to design the associated controller aims at regulating the two output DC voltages, generating...
A new three-phase three level inverter topology is proposed in this work. The presented structure is characterized by the use of a Bidirectional Neutral Point Clamped (BNPC) in order to compensate harmonics and to eliminate the reactive power and load varying under sever source voltages conditions. The control technique is based on Lyapunov candidate. An energy-based Lyapunov control strategy is developed...
Tidal current conversion systems are moving towards commercialisation. Tidal energy developers are looking to optimise their systems by testing all the available options and taking advantage of the experience from the wind energy industry. The key focus of this paper is to compare an induction generator with a permanent magnet synchronous generator in a tidal current conversion system with onshore...
This paper proposes a reduced voltage transformer based hybrid active power filter topology. It is a combination of two inverters with a split dc link voltage. The dc link voltage of the HFI is reduced by the transformer's turn ratio. Both the inverters are connected in shunt with the non linear load. The LFI provides a limited reactive power handling capability due to the high impedance in the shunt...
Use of multilevel inverter is becoming a trend in the recent years for high power applications. Various topologies and its assessment have been reported for recent literature. Power quality is an important phenomenon in the high power electric circuit and thus suitable topology must be selected for optimum result. Two multilevel inverter topology with the basic bridge configuration of single phase...
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