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This paper proposes a new hybrid carrier-based PWM technique for parallel interleaved two-level (2L) three-phase voltage source inverters (VSIs) analyzed as a single 3L inverter for line current ripple reduction. The carriers are interleaved to reduce the load side harmonics. However, this allows circulating current to flow between the VSIs. Using the proposed PWM technique, the circulating current...
The output voltage range of renewable energy generations such as wind and photovoltaic can be influenced by the parameters of environment at a wide range, which can not satisfy the requirements of system for grid-connected operation. Therefore high-gain voltage inverter is important to integrate the renewable energy into the utility. For high-gain voltage and standard load voltage at low input DC...
This paper presents the current application situation of five-phase permanent magnet synchronous motor and control algorithms. The mathematical model is established through the coordinate transformation, meanwhile the linear decoupling equation of PMSM state is also derived, two-vector control algorithm (NTV-SVPWM) and four-vector control algorithm (NFV-SVPWM) are discussed especially. A modified...
With the continuous development of high frequency inverter technology and multilevel inverter technology, all kinds of novel high frequency multilevel inverter are put forward and studied. And among them, the interleaved flyback three-level inverter (IFTLI) has a better work performance. In this paper, the control methods of single-phase IFTLI will be studied in-depth. Firstly, the instantaneous voltage...
The linear vernier permanent-magnet (LVPM) motor incorporates the merits of high efficiency and low cost, which is very suitable for long stroke applications. This paper proposed a new direct thrust force control for dual inverter fed open-end winding LVPM motor to reduce force ripple. First, the topology and structural characteristics of the LVPM motor are briefly presented. Second, the mathematic...
DC capacitor voltage imbalance is an inherent problem limited the further development of multi-level Neutral Point Clamped (NPC). In this paper, a new hybrid control method based on Space Vector Pulse Width Modulation (SVPWM) for five-level NPC at high modulation index and high power factor is presented. By choosing appropriate switching pattern in lower modulation index sectors and collocating different...
Aiming at the problem of five-level modulation strategy, which is numerous and difficult to be unified, a general modulation strategy based on phase-disposition is proposed. The proposed method is unified with the different modulation strategy by adding zero-sequence voltage on the modulated wave or changing the phase of staking carrier. To verify its correctness, using the proposed method to achieve...
This paper presents a comparative study between a conventional boosted-VSI electric/hybrid electric vehicle (EV/HEV) powertrain converter with alternative topologies including bidirectional CSI, Silicon (Si)-based current-fed Quasi Z-Source Inverter (CF-qZSI), and Silicon Carbide (SiC)-based CF-qZSI. The higher switching frequency operation of SiC MOSFETs enables the size reduction of reactive elements...
This paper further develops the concept of very large size flash-memory-based pulse-width-modulation (PWM) with the implementation of an over-modulation algorithm for a three-phase inverter. The compensation of voltage for linearization is incorporated within the same flash memory with a multi-optimal PWM generator. Using flash memory demonstrates a low cost alternative to advanced processors. This...
With regard to the pulse width modulation (PWM) of seven-phase motor system if the three-phase space vector pulse width modulation (SVPWM) is simply extended to the seven phase motor system that is the seven phase of the traditional SVPWM it will produce a great harmonic current. In order to restrain the harmonic content of phase current the voltage vector synthesized in the 3rd harmonic subspace...
Transformerless photovoltaic (PV) inverters offer several advantages in terms of weight and cost reduction as well as a higher efficiency compared to the topologies with transformers. However, the removal of transformers results in the establishment of a direct connection between the PV panels and the electrical grid which, consequently, leads to the generation of a leakage current. This current is...
This paper presents a three-phase converter architecture with a reduced common mode voltage to be used in photovoltaic power systems. The full-bridge architecture is modified by adding two additional switches in the DC path that allow decoupling the load from the source during the freewheeling phases. Optimized modulation strategies are analyzed and compared against the space vector modulation for...
A space vector pulse-width modulation (SVPWM) strategy for a three-level asymmetrical six-phase drive, with a single neutral point, based on vector space decomposition (VSD) approach is presented for the first time in this paper. The selection process, related to the determination of the right switching sequences for the proposed modulation strategy, is discussed in detail. The developed SVPWM strategy...
The multimedia system for e-learning about modulation techniques in three phase voltage controlled inverters is introduced. The multimedia system features for Block commutation, Sine Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM) are illustrated. Advantages of proposed multimedia system for e-learning about modulation techniques in three phase voltage inverters are indicated...
This paper proposes a space vector modulation algorithm for an asymmetrical six-phase open-end winding permanent magnet synchronous motor (OEWPMSM) supplied by two two-level six-phase voltage source inverters(VSIs) with common mode voltage suppression. The VSIs are fed from two equal and isolated DC voltages. A six-phase open-end winding PMSM model is developed based on the vector space decomposition...
This paper deals with comparative analysis different control methods of the Z-source inverter (ZSI). These control methods are Simple boost control SBC, maximum boost control MBC, maximum constant boost control MCBC, and the space vector modulation SVM. The relationship of voltage gains to modulation index and the THD are analyzed in detail and verified by simulation for the same modulation index.
Pulse width modulation (PWM) converter based variable-frequency drives to control AC machines have been widely used in motor drive system. However, it also leads to early bearing degradation in inverter driven machine due to the transient shaft voltage and high frequency bearing currents resulted from the PWM switching. To reduce the machine bearing current and extend the bearing lifetime, one possible...
A novel structure of Three Phase Infinite Level Inverter (TILI) topology has been derived from elementary Single Phase ILI (SILI). The rudiment structure of this topology is a DC-to-DC Buck converter followed by a H-Bridge. Fully rectified SPWM (FrSPWM) technique is used as control logic for implementing sinusoidally varying duty ratio delta (d). The proposed topology is compared with traditional...
The paper proposes a hybrid modulation algorithm that combines the space vector modulation technique (SVPWM) to control the rectifier stage and a new digital scalar modulation method (DSPWM) applied to the inverter stage. Compared to the conventional SVPWM method, the proposed DSPWM technique of the inverter stage is easier to understand and to be implemented. DSPWM allows reducing real-time computation...
A novel space vector PWM (SVPWM) strategy is proposed in this paper to balance the neutral-point voltage (NP) and the floating capacitor voltage for five-level active neutral-point-clamped (ANPC) converter. There are two different switching sequences in each small area. According to the NP offset, different switching sequences are used to control the NP voltage. Since the charge-discharge of the floating...
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