Modified Sine Triangle Approach For 30-Degree Split Clamp Pulse Width Modulation For Three Phase Voltage Source Inverter

This paper presents a mathematical and programming model of conventional space vector pulse width modulation(CSVPWM) and mathematical analysis of new approach for designing SVPWM imaginary switching times called active zero space vector pulse width modulation AZSVPWM for reducing the common mode voltage.Vcm from +Vdc/2 to+Vdc/6.In AZSVPWM method the complexity involved in calculating Vref and angle information zero voltage vector are eliminated by simply taking two opposite active voltage vectors.

This paper presents a new Pulse Width Modulation (PWM) technique for Z-source or Impedance Source Inverter (ZSI or ISI). The proposed technique is based on the Bus Clamping PWM (BCPWM) technique for Voltage Source Inverter (VSI). The effectiveness of the proposed technique is achieved by MATLAB simulation of a ZSI. It has been observed that the proposed technique gives better performances as compared to Conventional Space Vector PWM (CSVPWM) at high modulation index and at same switching frequency like reduction in load current ripple and reduction in voltage stress across the switches. Further the proposed technique ensures less switching loss as compared to CSVPWM at same carrier frequency.

The current paper aims at presenting and examining an implementation on a digital signal processor (DSP) of the conventional space vector pulse width modulation (CSVPWM) so as to control the dual three phase permanent magnet synchronous motors (DTP-PMSM) drives applied on electric ship propulsion. It is also an attempt to accomplish a developed control of this technique based on vector space decomposition (VSD) strategy. By this strategy, the analysis and the control of the machine are achieved in three two-dimensional orthogonal subspaces. Among the 12 voltage vectors having maximum, the conventional technique namely the adjacent two-vectors (12SA2V) is chosen. Thereby, the test platform allows the implementation of the chosen vectors which are modeled on MATLAB/Simulink using block diagrams and the automatically generated code which is targeted in the DSP card processor. Simulation and experimental results have exposed the efficiency of the proposed test bench of 5 KW prototype machine by using a low-cost TMS32F28379D.

Multilevel inverters are increasingly being used in high-power medium voltage industrial drive applications due to their superior performance compared to conventional two-level inverters. Thre are a number of Pulse width modulation (PWM) techniques applied in recent years. The most widely applied PWM techniques are Sine Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM). SPWM is the most simple modulation technique that can realize easily in analog circuit. However, it has some drawbacks such as higher total harmonic distortion (THD), lower effective DC utilization and lower switching frequency. Space vector pulse width modulation (SVPWM) is widely used because of their easier digital realization and better DC bus utilization and lower THD. The complexity is due to the difficulty in determining the reference vector location, on times calculation, and switching states selection. This paper presents a simple SVPWM algorithm for diode clamped three level inverters based on standard two-level SVPWM which can easily determine the location of reference vector, calculate the on-times, the selection of switching states. Three level diode clamped inverter (3LDCI) using space vector modulation technique has been modeled and simulated using MATLAB/SIMULINK and Origin 6.1 with a passive R-L load that can be extended to any level. Simulation results are presented to verify the proposed SVPWM control in terms of THD. The results are compared with conventional sinusoidal pulse width modulation (SPWM) where SVPWM shows better performance than SPWM in terms of THD. DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6038

In an isolated mode operation of wind power generating system (WPGS), operating voltage and frequency are affected under sudden change of load because of more transient time, higher total harmonic distortion. To minimize the effects, the WEGS should be operated with suitable controller and the inverter should be operated with required pulse width modulation (PWM) technique. In this paper, the proposed WPGS is simulated using MATLAB/Simulink with adaptive voltage controller (AVC) and load current observer (LCO) and the inverter is operating with Unified voltage Space Vector PWM (USVPWM) technique to improve the transient behaviour of the system. The same proposed system is also simulated with conventional space vector pulse width modulation (SVPWM) techniques. The simulation results will be analyzed in various load conditions. The conventional SVPWM results compared with the USVPWM results like transient time, load voltage and load current total harmonic distortion under balanced three-phase load.

Pulse width modulation (PWM) techniques involving different switching sequences are used in space vector-based PWM generation for reducing line current ripple in induction motor drives. This study proposes a hybrid PWM technique employing five switching sequences. The proposed technique is a combination of continuous PWM, discontinuous PWM (DPWM) and advanced bus clamping PWM methods. Performance of the proposed PWM technique is evaluated and compared with those of the existing techniques on a constant volts per hertz induction motor drive. In terms of total harmonic distortion in the line current, the proposed method is shown to be superior to both conventional space vector PWM (CSVPWM) and DPWM over a fundamental frequency range of 32–50 Hz at a given average switching frequency. The reduction in harmonic distortion is about 42% over CSVPWM at the rated speed of the drive.

Permanent Magnet Synchronous Motor (PMSM) drives are widely utilised in robotics and industrial automation applications due to their superior efficiency, reliability, and dynamic performance. However, when powered via converter systems such as Indirect Matrix Converters (IMCs), these drives often experience significant high-frequency harmonic distortion due to conventional Space Vector Pulse Width Modulation (SVPWM) techniques. These harmonics adversely affect system performance by increasing electromagnetic interference (EMI), acoustic noise, and overall power losses, thereby degrading efficiency and electromagnetic compatibility (EMC). To address these issues, this paper proposes a Markov Chain Pseudorandom Asymmetrical Space Vector Modulation (MC-PRASVM) technique for high-frequency harmonic suppression in PMSM drives. The proposed method employs the stochastic behaviour of Markov chains to generate pseudorandom, asymmetric switching sequences. This dynamic switching approach effectively spreads harmonic energy across a broader frequency spectrum, thereby minimising harmonic concentration and resonance. Simulation and experimental analyses demonstrate that the MC-PRASVM technique significantly improves current waveform quality, reduces total harmonic distortion (THD), and enhances electromagnetic compatibility compared to traditional SVPWM strategies.

The Space Vector Pulse Width Modulation (SVPWM) is possibly the best among all the PWM techniques for variable frequency drive applications. Unfortunately, the modulation algorithm is mainly implemented with software based on microcontroller or digital signal processors (DSP). These are software-based technique purely and obviously not an ideal solution. Employing Field Programmable Gate Array (FPGA) to realize SVPWM strategies provides advantages that it is considered as an appropriate solution to boost system performance of an SVPWM algorithm. Moreover, although in the literatures the implementation for three-phase SVPWM based on FPGA is not lacking, however all these designs are based on the conventional SVPWM without considering hardware-resource saving and not simple. This paper present a simple realization of 5-segment discontinuous SVPWM with a difference approach based on FPGA, in which the judging of sectors and the calculation of the firing time to generate the SVPWM waveform is simple, and also the switching losses is low. The proposed discontinuous SVPWM has been designed and successfully implemented by using APEX20KE Altera FPGA considering hardware-resource saving and has successfully driven a three phase inverter system with induction machine 1.5 kW as load.

A multiaverage random switching frequency space vector pulsewidth modulation (MARSF-SVPWM) strategy is proposed in this article, in order to further disperse the high-order harmonics concentrated at the switching frequency and its integer multiplies in the output voltage of the inverter. The proposed strategy divides the fundamental period equally, with different stages corresponding to different average switching frequencies and spread-spectrum ranges, in contrast with the conventional random switching frequency space vector pulsewidth modulation (RSF-SVPWM), under the premise of maintaining the same overall average switching frequency and spread-spectrum range. The simulation and experimental results demonstrate that, even in the case of a narrow spread-spectrum range, the proposed MARSF-SVPWM strategy can obtain a better effect of high-order harmonic dispersion.

Pulse Width Modulated (PWM) Rectifiers have gained the popularity during recent years for the ac to dc conversion needs of the industry, customer and power grid sectors. This bidirectional convereter can acts as an ac to dc boost rectifier with near unity power factor at the grid side along with regulated and ripple free dc voltage at the output. This paper presents voltage oriented control of the three phase PWM rectifier with Bus Clamped Space Vector Pulse Width Modulation(BCSVPWM) to reduce the switching loss and to improve the performance. The performance of the rectifier with BCSVPWM has been compared with the conventional Sine PWM(SPWM) and the regular Space Vector PWM (RSVPWM)techniques. The input current harmonics, Switching loss, Output dc voltage range and the dynamic performance are analysed with MATLAB/Simulink and better results are obtained with the propoded method.

Several pulsewidth modulation strategies have been proposed for the three-level three-phase neutral-point-clamped DC-AC converter. Among them, the nearest-three virtual-space-vector (NTV2 ) pulsewidth modulation (PWM) guarantees the DC-link capacitor voltage balance under any operating condition, provided that the addition of the three phase currents equals zero. However, this is achieved at the expense of a higher number of switching transitions per switching cycle, as compared to conventional nearest-three space vector (NTV) PWM. This paper presents a detailed loss and thermo-dynamical model of the converter. The model is used to quantitatively compare the converter losses and device thermal stress incurred by the NTV2 PWM and a conventional NTV PWM, operating at the same switching frequency, and for different AC load angles. The results show that under low load angles the NTV2 PWM presents a similar amount of losses and device junction temperature stress compared to the conventional NTV PWM, thanks to a better switch utilization

Finite control set model predictive control (FCS‐MPC) has been widely used in the control of grid‐connected converters with the advantages of fast dynamics, multi‐objective control, and easy implement. However, the conventional FCS‐MPC bears with variable switching frequency, high current ripple and computational burden. An improved current model predictive with the cost function‐based modulation scheme (CFM‐MPC) is proposed for a three‐phase three‐level VIENNA rectifier to improve the power quality. First, the mathematical model and voltage vector are given according to the principle of deadbeat control. Then, the voltage vector of different voltage vectors are selected according to the location of the voltage vector reference, and the switching action time of the selected are directly calculated by the inversely proportional with cost function value of the selected vectors. It remains the merits of both the conventional MPC and space vector pulse width modulation schemes to track the optimum voltage vector without increasing the computational burden. Finally, a comparative study with the proposed CFM‐MPC and conventional FCS‐MPC has been conducted to verify the superiority of the proposed scheme. The results show the proposed CFM‐MPC has the advantages of lower power ripple, fixed switching frequency, lower total harmonic distortion and neutral point potential balance.

This paper proposes a hybrid pulse width modulation (PWM) based field weakening control strategy for a hybrid-inverter-driven open-winding (OW) permanent magnet synchronous motor (PMSM) system. The hybrid-inverter consists of two voltage source inverters, one is connected to a dc voltage source and named as main inverter (MI), and the other is connected to a floating capacitor and called compensation inverter (CI). A novel hybrid PWM technique is proposed for the hybrid-inverter, in which a double-vector-based PWM is applied to the MI to reduce the switching frequency, and the conventional space vector PWM is applied to the CI to compensate the reactive power. Furthermore, a field weakening (FW) control strategy based on the hybrid PWM technique is proposed to better utilize the dc-link voltage and extend the operation range of the OW-PMSM system. Simulation and experimental studies are carried out to verify the high efficiency and wide speed range of the proposed strategy.

SVPWM control strategy for a three phase five level dual inverter fed open-end winding induction motor

Torque ripple caused by zero-sequence current (ZSC) and relatively high switching frequency severely worsens the operating performance of an open-winding permanent-magnet synchronous machine (OW-PMSM) system with common dc bus. In this paper, a novel q-axis current injection method based on the angle-shift-based voltage distribution is proposed for the OW-PMSM system with common dc bus. With the proposed method, torque ripple caused by ZSC can be counteracted by the torque component generated by the injected q-axis current. Meanwhile, the corresponding modulation range is analyzed to investigate the availability of the proposed method. Moreover, in order to reduce the switching frequency, zero vector (111) is no longer necessary to compensate the zero-sequence component and conventional space vector pulsewidth modulation (PWM) with zero vectors (000) and (111) can be simplified. The switching actions in one PWM period can be reduced from 12 to 8. The comparison of losses shows that this strategy can effectively improve the efficiency under both heavy load and high switching frequencies. Finally, the effectiveness of the proposed method is validated through an OW-PMSM experiment with common dc bus.