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This paper proposes a 5-level double converter with dividing the DC link voltage in different ratio and new pulse width modulation (PWM) technique. The 5-level double converter has five potentials (P2, P1, NPP, N1, and N2) in the DC link and they can be obtained with splitting the DC link by four capacitors (Fig.1). The NPP potential corresponds to base potential and the value is zero. In the proposed...
With the continuously reducing cost of grid-connected photovoltaic (PV) power generation and the further intensification of energy crisis, grid-connected PV power technology obtains more and more application. The topology for single-phase grid-connected PV system and the control technology based on TMS320LF2407 digital signal processor (DSP) are summarized in this paper. The functions, such as operation,...
This paper presents a novel control scheme suitable for high-power high-performance AC power supplies. The performances of the conventional current-regulated voltage-controlled system with bipolar PWM are first analyzed in detail. The proposed control scheme incorporates dual synchronous PWM technique of single-phase full-bridge inverter and multiple feedback loop. Thanks to this scheme, the AC power...
The aim of this document is to discuss PWM strategies on 3-level NPC H-bridge topology. This structure is composed of three cells, each one contains two 3-level NPC legs. In this paper, we present a structure allowing the achievement of 6 kV phase to phase motor voltage and a control strategy that enables to obtain 5 levels on output voltage. However, using asynchronous PWM at high speed use, switching...
Several techniques for analyzing and estimating power losses in insulated-gate bipolar transistors (IGBTs), diodes, MOSFETs, and other power electronics switching devices are known. Most of the approaches in the literature deal with periodic pulse width modulation (PWM) switching schemes. This paper presents a simple analysis tool to estimate these losses under aperiodic switching schemes, e.g. hysteresis...
We will discuss in this paper predictive current control strategies for power electronic circuits with natural commutations, for voltage source - and current source - inverters. Due to the different behavior of these circuits we have to realize different strategies, but the general objective is to achieve the best dynamic behavior of the current control loop, independent of whether the current is...
In this paper, a new method to mitigate the common-mode (CM) voltage in neutral point clamped (NPC), three-level converters is proposed by analyzing the voltage vectors and related CM voltages. Currently, only 19 of 27 available voltage vectors are used in order to reduce the amplitude of CM voltage to be one sixth of the dc-link voltage. This is achieved by adding a constraint to the universal, multilevel...
A novel Dispersion SVPWM Algorithm is proposed in the paper based on the conventional SVPWM analysis. In per control period, the dwelling time of basic voltage vector can be calculated by the 3 phase voltage dispersion, and without coordinate transformations, trigonometric function, inverse trigonometric function and vector decomposition, which simplified the conventional SVPWM algorithm. The proposed...
The supply of high intensity discharge (HID) lamp at high frequency provides important benefits in ballast optimization. However, in certain frequency range, the lamp is disturbed by the acoustic resonance (AR) which can lead to lamp arc fluctuation, extinction and lamp destruction in the worst case. This paper presents a novel approach of lamp control based on the injection of signals of approaching...
The indirect matrix converter (IMC) concept has been gaining recognition as a promising circuit alternative in recent years. An IMC has separate line and load side converters. Each switching period of line side converter is split into two portions. In each portion, the IMC is equivalent to a conventional inverter. Thus, output voltage can be obtained through applying a kind of space vector PWM to...
This paper introduces the TMS320LF2407A chip and studies its application in variable frequency speed regulation system. This system uses main circuit of AC-DC-AC voltage type frequency conversion; adopts SVPWM technology; takes TMS320LF2407A as the main control chip; and uses IPM-PW100CVA120 to the main circuit of inverter. The full digital implementation and the experimental Waveform based on TMS320LF2407A...
This paper presents a PWM inverter regulation using a simple single input fuzzy logic controller (SIFLC). Compared to its conventional Two inputs FLC (TIFLC), the proposed SIFLC requires fewer number of rules and tuning parameters. The design complexity is much reduced but its performance is comparable to TIFLC. To verify the viability of the SIFLC, a single-phase PWM inverter utilizing this scheme...
This paper presents an excellent PWM method for power conversion circuits. The proposed method is called a vector frequency modulation (VFM). VFM does not belong to any conventional PWM methods. Although an idea of space voltage vectors is employed, any traditional equations to calculate the periods of the voltage vectors are not used. The voltage vectors are classified into two groups, zero vectors...
This paper reviews the control methods that are used to regulate the output voltage of PWM inverters. Based on their structure, the controllers can be categorised under model-based controllers, non-model based and mixed-mode based controllers. The fundamental concepts of these controllers are described along with examples from each category. Furthermore limitations in terms of practical implementation...
Boost inverter is able to generate an AC voltage whose peak value can be larger or smaller than the DC input voltage in a single stage. The boost inverter consists of two individual boost DC-DC converters. Each of the boost DC-DC converters has to be controlled in variable operating point condition. This paper proposes two voltage mode controllers. First one is conventional feedback controller based...
Analysis and minimization of input current and voltage ripples of five-phase PWM inverters are presented in this paper. The analytical expressions for the RMS value of input current and voltage ripples as a function of the PWM reference signal are derived. Different to three-phase PWM inverters, it is shown that pure sinusoidal is the optimum reference signal that produces minimum input voltage ripple...
Conventional 2-level PWM inverters generate high dv/dt and high frequency common mode voltages which is very harmful in electric drives applications. It may damage motor bearings, conducted electromagnetic interferences, and malfunctioning of electronic equipments. This paper presents the simple methods to control the harmonics as well as common mode voltages in multilevel inverters using different...
This paper will present a dead-time elimination scheme for PWM-controlled inverter/converter. The presented dead-time elimination scheme doesnpsilat require separated power supplies for wheeling current detection of high-side and low-side power devices. The presented scheme includes the freewheeling current polarity detection circuit and the PWM control generator without dead-time. It will be shown...
In this paper will be studied the phase disposition (PD) modulation with application of the modulation known as centered space vector (CSV PWM) to the hybrid multilevel symmetrical inverter . Using the generated distortion rate obtained, a comparison with the PSD modulation originally applied is made. The article included the results of an experimental low-power prototype with its fast switches operating...
Four-leg voltage-source converters provide an effective neutral connection in three-phase systems with neutral wire. They can be applied to inverters, rectifiers or active filters to control the neutral current caused by unbalanced or nonlinear loads as well as unbalanced sources. From the modulation point of view, the four-leg converters can be considered as four-phase systems. Hence, the modulation...
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