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Variable frequency drive of single-phase induction motor can have many potential advantages, like reduced inrush current during starting, high starting torque, possibility of higher efficiency, more tolerant to variation in grid supply voltage etc. Many of the existing electrical gadgets use single-phase induction motor of capacitor start / capacitor-run type. A typical example is the motor used in...
This paper proposed a high efficiency standalone inverter design for Google Little Box Challenge (LBC). A full bridge inverter is designed with two high frequency legs and one low frequency leg. To improve the system efficiency, asymmetrical unipolar modulation is utilized and interleaved switching is used. The synchronization between high switching frequency leg and low switching frequency leg is...
The software development of a three-phase micro-inverter on a low cost Multiprocessor platform, available on the BeagleBone Black, is presented. Apart from signal conditioning circuits, it is aimed solely the use of existing components in the board. Real-time systems are used for a strict time control over the three-phase sinusoidal modulation and over the sampling used for the internal control system...
This work proposes a dc current balancing control for a three-phase high-power factor five-level buck+boost-type converter. The converter act as both a rectifier or as an inverter interfacing residential dc power distribution systems to the ac grid. A pulse width modulation with two symmetrically phase-shifted carriers drives the converter in an interleaved operation with interphase transformers (IPT's)...
This paper describes a universal sinusoidal modulator developed primarily for the multilevel cascaded H-bridges converters. The modulator was implemented as a FPGA entity and its versatile features allows it to be easily reused in various topologies based on H-bridges. This includes the control of the H-bridge resonant converters by pulse frequency modulation so that it is well suitable for the power...
This paper presents some popular multilevel converter topologies and associated modulation techniques considering advantages for electric transportation (ET) applications including electric vehicles (EVs), charging stations, wireless charging, etc. Cascaded H-Bridge (CHB), Flying Capacitors (FC) and Neutral Point Clamped (NPC) are analyzed. Moreover, mostly used switching techniques in multilevel...
In this paper, a comparison between the proposed level-shift and the phase-shift duty-cycle modulations, based on the continuous carrier-based space vector pulse width modulation (SVPWM) via the ac and dc components injection technique, is presented. The dual techniques are selected to overcome the output voltage distortion of the nine-switch inverter caused by the cross-over of the duty-cycle modulating...
This paper investigates the core losses of an interior permanent magnet synchronous motor (IPMSM) under no-load condition. Two experimental tests have been carried out to observe the impact of the pulse-width modulation (PWM) inverter voltage supply on the core losses. The results show that the high frequency harmonic of the voltage supply is responsible for about 22% of the total core losses.
This paper presents an ozone generator by using a full-bridge inverter for applying in prolonging fruits process. The phase-shifted pulse width modulation (PSPWM) is used in the proposed circuit for adjusting the output power of inverter. In addition, the concentration of ozone will be controlled by adjusting the operating frequency of inverter. In order to prove the mentioned principle, the ozone...
This paper presents loss modeling of an asymmetrical two-phase induction motor driven by a three-leg voltage source inverter (VSI) providing unbalanced space vector PWM output voltages. The model parameters are estimated by using a set of measured data obtained from actual motor in conjunction with the genetic algorithms. In order to prove the validity of the loss model, comparison between measured...
Two types of five-level inverter topology structure will be discussed in this paper: traditional five-level NPC inverter and five-level NPC H-bridge inverter. Except for the comparison of the two topology structures, the closed-loop control method of the neutral point balancing of the five-level NPC H-bridge inverter will be presented in the paper. For the modulation method of two five-level inverters,...
Nowadays multilevel converter topology has been growing since last few decades because it consists of lesser number of switches and DC sources. Multilevel converter topology integrates the stepped waveform to produce waveform nearly equal to sinusoidal waveform. To reduce switching losses and increasing efficiency of multilevel inverter the core idea is to minimize the number of switches. The proposed...
Usage of renewable energy is rapidly growing in last times. Photovoltaic energy has a big potential to supply the households in the near future. Small photovoltaic power systems are being developed in last years. Many issues are connected with this type power system. New inverter topologies are developed to handle effective photovoltaic power system connected to the grid. In the paper, parameters...
This paper proposes a new control strategy for a single phase isolated-dual-active-bridge series resonant converter (IDBRC). The proposed strategy combines both frequency modulation and phase shifting between the two active bridges. The shifted phase is kept at a suitable value to maximize the average power factor of the system and to handle the direction of the power flow. Meanwhile, frequency modulation...
This paper presents a numerical approach for determining the theoretical harmonic components of unconventional pulse width modulation (PWM) strategies such as the Unified-Double Carrier PWM (Uni-DC PWM). The method uses a double Fourier integral formulation to analyze the inverter DC-link current harmonic components, by establishing inner and outer integral limits of this formulation. The provided...
In an AC-DC-AC motor drive system, a beat phenomenon of the motor current occurs, especially in the over-modulation range with DC-link voltage ripple and low frequency carrier. We analyze this beat phenomenon and propose two beatless control methods. One modifies the carrier frequency in accordance with the motor speed within a narrow range, and as a result, the beat frequency can be shifted to a...
The output common-mode (CM) voltage will bring many negative effects in a three-phase inverter, which is controlled by the sinusoidal pulse width modulation (SPWM) method. The carrier multi-modulation (CMM) scheme, which is composed of the carrier peak position modulation (CPPM) technology and the carrier 2-frequency-modulation (C2FM) technology, is presented to suppress the CM voltage (CMV) in this...
This paper demonstrates the use of a very large SD Card flash-memory to the control of a three-phase inverter. The digital architecture differs from conventional counter-based implementation because it follows a pre-programmed optimal PWM pattern that is read from a large-size (8MB) memory with magnitude and phase as coordinates. A multi-optimal PWM algorithm is considered to reduce harmonics while...
The 60° flat-top modulation technique (also called two phase or discontinuous modulation) is a widely used method in the industry to reduce switching losses in three phase PWM inverters. This technique reduces the number of switchings via adding a zero sequence component to the output voltage. The added component is chosen such that one of the phase legs is not switched, but the phase-to-phase voltage...
The paper provides performance analysis of an induction motor drive fed by a Z-source inverter operating under random pulse width modulation. The paper also provides a description of control techniques based on a random pulse position PWM obtained using a triangular carrier waveform. The control algorithm has characteristics of both space vector and random lead-lag modulations. The random PWM signal...
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