Space vector PWM technique for a novel three-to-seven phase matrix converter

This paper introduces an integrated energy storage and reactive power compensation in a large wind power plant, and it deals to regulate the reactive power supplied by a variable-speed Wind Energy Conversion System (WECS), based on an induction generator fed by a Matrix Converter (MC). The control strategy used in this paper is input current observer, implemented using an estimation of the modulation index, and a nonlinear control loop that regulates the displacement angle at the matrix converter input. This paper is described the implemention of the matrix converter to control the reactive power by using the Space Vector Pulse Width Modulation (SVPWM) technique in large wind farms and combining them into one system to maintain stability control of the wind power plant. Control of reactive power increases the regulating capacity, which can provide voltage stability in the wind farm. In this work, Matlab/Simulink TM model and simulation of the three phase matrix converter have been performed using the space vector control algorithm. The algorithm uses a simpler method than the other control algorithms to control the input power factor. To verify the performance of the proposed Matrix Converter, modulation strategy, and control design methodology, various simulation results are presented.

This article proposes a modulating and carrier-based dodecagonal space vector pulse width modulation (DSV-PWM) technique for split-phase open-end induction motor (OEIM). The advantage of the DSV-PWM technique is that the fifth and seventh order (6n±1; n=1,3,5,...) harmonics are eliminated from the phase voltage of the split-phase OEIM. The modulating waveform is generated from the sinusoidal reference signals by adding the triplen, and fifth and seventh order harmonics. This modified reference waveform is compared to the triangular carrier waveform to generate the PWM gating signals for inverter-1 so that the vector addition from two inverters results in a 12-sided polygonal space vector structure for the PWM control. The PWM signals for the two-level inverter-2 connected to the other end of the OEIM are produced by performing a small logical operation using the PWM signals of inverter-1. The dc voltage relation between inverter-1 and inverter-2 is 1:0.366. The timing duration for inverter-1 and inverter-2 is the same to generate the dodecagonal space vector structure (DSVS) and can be easily implemented as in the case of a conventional sine-triangle PWM technique in a three-phase drive. So, mapping the space vectors of the DSVS of conventional split-phase to that of the OEIM drive is simple. This can be achieved using a logical operator like <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">xor</small>. Thus, the computation burden of the digital signal processors to produce the DSV-PWM signals is reduced with the proposed algorithm which is 3.45 times than the conventional space vector-based implementation using sector identification, vector time computation, and storing the switching vectors. A detailed analysis of the modulating waveform and DSV-PWM signal generation with the experimental verification of the proposed drive is presented in this article.

This paper aims at obtaining fixed output voltage of frequency 50 Hz to the load by a Self Excited Induction Generator (SEIG) employed in Wind Energy Conversion System (WECS). The output voltage of a SEIG is a function of wind turbine’s speed, which varies with wind velocity. Due to the variation in shaft speed of the wind turbine, the output voltage and frequency of Doubly Fed Induction Generator (DFIG) will vary. In this paper, a new WECS is proposed in which the conventional PWM AC/ DC/ AC converter is replaced by a Matrix Converter (MC) topology and the DFIG machine is replaced by a low cost Squirrel Cage Induction Generator. MC eliminates bulky DC link capacitor, provides bi-directional power flow capability, independent control on the output voltage magnitude, frequency and phase angle as well as the input power factor. Space Vector Pulse Width Modulation (SVPWM) technique is used for controlling MC in such a way that output load voltage and frequency is kept constant for all wind velocities. The SVPWM technique provides higher voltage transfer ratio without lower order harmonics. SVPWM is digitally implemented using DSP processor (TMS320 F2407A). Switching times are pre-calculated offline. Semi soft commutation procedure for safe switching control of MC switches is also presented.

This paper presents a modified space vector pulse width modulation (MSVPWM) technique for nine-level cascaded H-bridge (CHB) inverter. Based on a modular structure and absence of capacitor balancing problems, CHB inverter topology is preferred. Nowadays, space vector PWM (SVPWM) control scheme has achieved higher attention among different PWM techniques. In general, SVPWM method is realized based on disintegrating higher-level hexagons into a number of two-level hexagons. Compared to conventional SVPWM technique, the proposed MSVPWM technique reduces the computational burden and memory requirement involved in the realization of nine-level SVPWM. This is achieved by reducing the number of two-level hexagons without losing the inverter output voltage profile. Also a further modified space vector pulse width modulation technique is presented, which greatly reduces the computation efforts. The proposed SVPWM techniques are applied to a nine-level CHB inverter by using MATLAB/SIMULINK software tool and are compared with carrier-based sinusoidal pulse width modulation (SPWM) technique to validate the proposed techniques. The proposed SVPWM schemes produce lower harmonic distortion and higher DC bus utilization compared to SPWM technique. To verify the practicality of the proposed SVPWM techniques, experimental results are presented on nine-level CHB inverter.

This paper presents a new topology of sparse matrix converter (SMC) based on extended boost z-source inverter topology. The proposed topology gives more boosting factor as compared to other z-source matrix converters with same modulation index. Space vector pulse width modulation (PWM) technique as well as zero current switching has been implemented for the proposed topology. Further detail analytical study of the proposed topology has been done. It can be concluded that, the proposed topology can be more suitable for motor drives, wind energy conversion systems (WECS), HVAC applications. Further boosting factor can be easily extended by cascading basic impedance networks. Also the variable frequency output voltage has been generated from the proposed topology with proper modulation techniques. The effectiveness of the proposed topology is verified with MATLAB/SIMULINK simulation study.

A voltage source inverter with variable frequency and variable voltage is applied for three-phase interior permanent magnet synchronous motor (IPMSM) drive for variable speed application. To obtain the required output voltage in the line side of the inverter a suitable pulse width modulation technique is used. The most prominent PWM techniques are Sinusoidal pulse width modulation (SPWM) and Space vector pulse width modulation (SVPWM). SPWM is simple and easy method to generate pulses for inverter, whereas SVPWM is an accurate method and generate less harmonic distortion compared to SPWM. However there is a lot of complexity involved in calculation of angle and sector as the level increases with SVPWM. To overcome this a similar and easy method known as unified pulse with modulation also know as carrier based space vector pulse width modulation technique(CBSVPWM is described using the concept of effective time. By using this method the inverter output voltage is directly synthesized by the effective times and the voltage modulation task can be greatly simplified. In this paper an IPMSM drive using CBSVPWM is simulated using MATLAB/SIMULINK software and its performance is compared with SPWM by varying modulation index (MI). The simulation study reveals that CBSVPWM simple and easy method which utilizes dc bus voltage more effectively and generates less THD compared to SPWM.

This paper is to present a new space vector pulse width modulation (PWM) algorithm for four switch three phase inverter (FSTPI) fed induction motor under DC-link voltage imbalance. By using reasonable mathematical transform, space vector PWM (SVPWM) technique for FSTPI under DC-link voltage imbalance or ripples have been solved, which is based on the establishment of basic space vectors and modulation technique in similarity with six-switch three-phase inverters. This approach has a very important sense to solve hard problems for FSTPI under DC-link voltage imbalance, for example ensuring the required voltage for undermodulation mode and overmodulation mode 1 and 2, extended to six-step mode. Matlab/Simulink is used for the simulation of the proposed SVPWM algorithm for undermodulation, overmodulation mode 1 and 2. This SVPWM approach is also validated experimentally using DSP TMS320LF2407a in FSTPI-IM system.

This paper presents an efficiency analysis of the six‐phase induction motor (SPIM) drive using a five‐level dual three‐phase space vector pulse width modulation technique. A dual three‐phase space vector is obtained by decomposing a five‐level six‐phase space vector into two three‐phase space vectors, which greatly simplifies the algorithm. This paper also presents a comparative efficiency analysis of SPIM drive with its three‐phase counterpart. As a proof of concept, Matlab/Simulink environment was used to simulate the proposed scheme. In addition, a prototype was developed and tested in the laboratory. Experimental results validate the simulation results to a good degree of satisfaction and verify the correctness of the proposed scheme.

In this paper, space vector pulse width modulation (SVPWM)-based algorithms for a five-phase open-end load fed from dual matrix converter (DMC) have been proposed. In the presented modulation methods, the reference output voltage vector is synthesized from two three-to-five phase matrix converters at both the ends of the load. Depending on the power-sharing of the two MCs, two proposed modulation methods are defined as equal reference sharing (ERS) and unequal reference sharing (URS). The performance of ERS and URS for the three-to-five phase DMC drive is compared. Performance comparison is based on the total harmonic distortion in the output voltages and the percentage of the voltage transferred from the source to the load, for the full linear modulation index (MI) range. Common mode voltage and zero sequence current in the load are also discussed. The efficiency of the ERS and URS is compared. It has been observed that the proposed ERS scheme offers better performance compared with URS for most of the MI values. The suggested modulation techniques are implemented in MATLAB/Simulink. The hardware setup is developed and control algorithm is implemented using dSPACE working in conjunction with the FPGA interface board for practical validation.

This paper presents a unified carrier-based modulation method for direct matrix converter. Various types of pulse width modulation (PWM) methods are generated by using the offset voltage, changing slope of carrier waveform, and adjusting the free parameters in the modulation algorithm. The proposed method is equivalent to the space vector pulse width modulation (SVPWM) for two-level and three-level voltage source inverter (VSI). This paper also presents a new viewpoint to understand the matrix converter modulation method such as single carrier based modulation technique for two-level VSI and double carrier based modulation technique for three-level VSI. Using the proposed method, this paper presents discontinuous pulse width modulation (DPWM) for the matrix converter. Therefore, a unified simple algorithm suitable for the digital implementation of all continuous and discontinuous PWM strategies is proposed. The feasibility of the proposed modulation method has been verified by a computer simulation results. These results show that the proposed carrier-based modulation method can be implemented easily without any tables.

This paper presents a new switching algorithm for a five-phase voltage source inverter (VSI). In this method a space vector pulse width modulation (SVPWM) based on zero vector elimination is proposed to reduce voltage distortions. The new SVPWM has eight voltage levels to natural point in each phase. To verify the validity of the proposed method, a 2KW laboratory prototype with five-phase is implemented. The experimental result of the new method is compared with the conventional SVPWM for a same sampling time. The experimental results and simulation show that the new SVPWM has relatively lower THD and switching frequency.

Space Vector Pulse Width Modulation (SVPWM) technique is extensively used to control the three-phase voltage source inverter (VSI) of wind energy systems. The main advantages of SVPWM method are fixed switching frequency, low harmonic content and higher DC bus utilization. In terms of the use of the DC bus voltage compared to conventional PWM method provides 15.15% more efficient usage. This paper focuses on SVPWM controlled three-phase VSI simulated under MATLAB/SIMULINK.

Common-mode voltage (CMV) generated by the inverter causes motor bearing failures in multiphase drives.On the other hand, presence of undesired z-component currents in six-phase induction machine (SPIM) leads to extra current losses and have to be considered in pulse width modulation (PWM) techniques. In this paper, it is shown that the presence of z-component currents and CMV in six phase drive system are two major limiting factors in space vector selection. The calculated voltage space vectors for both symmetrical and asymmetrical SPIM drive system with three-level inverter are illustrated in the decoupled subspaces and described in terms of undesirable voltage components and CMV value. Several space vector pulse width modulation (SVPWM) techniques are investigated based on CMV and z-component currents generation. Then, a modified SVPWM technique with minimum current distortion, undesired current components and CMV with a modest torque ripple is proposed based on the simulation results.

Purpose This paper aims to present a modified space vector pulse width modulation (SVPWM) technique for six-phase induction motor drive based on common-mode voltage (CMV) and current losses which are two important issues affecting drive system behavior and quality. Design/methodology/approach It is shown that the presence of z-component currents and the presence of CMV in six-phase drive system are two major limiting factors in space vector selection. The behavior of several space vector selections in a two-level inverter considering minimum CMV and z-components is investigated. Then, the space vectors in a three-level inverter is analyzed and tried to explore an SVM technique with better behavior. Findings The analyses show that all the problems cannot be solved in a six-phase drive system with two-level inverter despite having 64 space vectors; this study tried to overcome the limitations by exploring space vectors in a three-level inverter. Originality/value The proposed pulse width modulation (PWM) strategy leads to minimum current distortion and undesired current components with zero CMV and modest torque ripple.

This paper proposes the modified space vector pulse width modulation (SVPWM) control algorithm for the three-phase voltage source inverter (VSI), which consists of traditional six switches VSI and three bidirectional switches for creating the ac decoupling circuit. This topology has some advantages such as the ability to reduce the leakage ground current from PV panel and therefore improve the efficiency of photovoltaic (PV) energy conversion based on the principle of decoupling when the zero space vectors occur. Likewise, no current flows through six traditional switches in zero space vectors, thus they operate at lower average temperature. In this case, the conduction losses are reduced. For avoiding shoot-through states between six traditional switches and three bidirectional switches, a delay time has been added to switching time and managed carefully to guarantee THD of output voltage. Operating of the inverter with the modified SVPWM method is simulated by using Matlab/Simulink software and implemented in the experimental prototype by using FPGA Virtex 5 (Xilinx).