A new delta inverter system for grid integration of large scale photovoltaic power plants

Int Trans Electr Energ Syst

Hamouda

2020

Summary This paper proposes and evaluates the performance of a new space vector pulse width modulation (SVPWM) technique for a reduced topology of a three‐phase voltage source inverter namely delta inverter. According to the operation principle of the delta inverter, it is not possible to provide a zero‐voltage vector. Therefore, unlike conventional SVPWM techniques that apply two active vectors and one zero‐vector to synthesize the reference voltage vector, the proposed technique makes use at any switching period of the three available active vectors of the inverter's space vector diagram. Moreover, an appropriate switching sequence is introduced with the aim to create a virtual zero‐vector from the application of the three available active vectors. New analytical expressions of the duty ratios that define the application times of each active vector are also developed in this work. The effectiveness of the proposed SVPWM technique was firstly proven through numerical simulations carried out on a delta inverter feeding a three‐phase RL load. A comparative study with the existing modulation methods showed the superiority of the proposed SVPWM technique. The latter was also implemented in real‐time on a digital signal processor and has been experimentally tested on a laboratory prototype of a delta inverter feeding an induction machine and an RL load. The obtained results confirmed its feasibility as well as its high performance.

Section: Introductionmentioning

confidence: 99%

Characteristics of a proposed SVPWM strategy for delta inverter with DSP‐based real‐time implementation

Int Trans Electr Energ Syst

Hamouda

2020

“…According to these research studies [35–40], reducing the number of switching devices improves the reliability of solid‐state controllers and reduces their manufacturing cost as well. However, the output waveforms of the reduced inverters such as the FSI and TSI involved more harmonics than the conventional SSI.…”

Section: Introductionmentioning

confidence: 99%

“…As for the second reduced topology namely to the reduced TSI, it has been the subject of many research works [19,[35][36][37]. The benefits of the delta inverter which allows to reduce the cost of the inverter to the half have been presented by Evans et al since the beginning of the 1980s [38,39].…”

Section: Introductionmentioning

confidence: 99%

“…The benefits of the delta inverter which allows to reduce the cost of the inverter to the half have been presented by Evans et al since the beginning of the 1980s [38,39]. Notice that the use of three packs of battery instead of one in the SSI makes the use of TSI suitable only in the battery available applications such as the electric propulsion and the large scale grid-connected photovoltaic systems [19,36,40] According to these research studies [35][36][37][38][39][40], reducing the number of switching devices improves the reliability of solid-state controllers and reduces their manufacturing cost as well. However, the output waveforms of the reduced inverters such as the FSI and TSI involved more harmonics than the conventional SSI.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reduced inverters fed BDCM drives: an attempt to improve cost‐effectiveness, compactness and reliability in hybrid vehicles

IET Electric Power Applications

2020

Following the climatic changes, there is a universal commitment to reduce greenhouse gas emissions, especially those due to mobility. A particular interest is addressed to hybrid propulsion systems, which are currently considered as viable candidates for a sustainable mobility. Within this commitment, the study proposes an approach to improve the cost‐effectiveness, compactness and reliability of the electric drive unit of hybrid propulsion systems. This is achieved thanks to different associations of brushless DC motors (BDCMs) and reduced topologies of DC/AC converters such as the four switch inverter and three switch inverter. A special attention is focused upon the analysis of the sequences and commutations characterising the six‐phase and three‐phase BDCM drive operation. Implementation schemes of dedicated control strategies are given. Moreover, a comparison of selected features related to the ratings of the investigated BDCM drives is carried out and commented. Experimental results are provided to validate the performances of a reduced structure inverter fed three‐phase BDCM under the dedicated control strategy.

“…In this context, the delta inverter has been introduced as the smallest three-phase inverter topology where only three power semiconductor components are needed to provide a balanced threephase output voltage system [3]. This inverter which requires three independent DC sources is therefore a promising solution in two main industrial applications: electric or hybrid traction systems and large photovoltaic energy generators, where the number of the DC sources, in both cases, is discarded [4][5][6][7]. The space vector modulation (SVPWM) is one of the most powerful control algorithms which allow a free generation of the opportune switching sequences of the inverter's switches.…”

Section: Introductionmentioning

confidence: 99%

Efficient FPGA‐based real‐time implementation of an SVPWM algorithm for a delta inverter

Alouane

Hamouda

et al. 2018

IET Power Electronics

This study proposes an efficient field programmable gate array (FPGA) implementation method of an enhanced space vector pulse width modulation (SVPWM) algorithm for a delta inverter. The overall hardware configuration of the FPGA is made graphically using the high-level Xilinx system generator (XSG) programming tools. The proposed descriptive XSG model is first evaluated by running a hardware co-simulation test. The comparative study with computer simulations performed with Simulink shows a good agreement between the results of both methods, which approves the accuracy of the proposed descriptive XSG model. Moreover, an experimental test is carried out on a laboratory prototype of the delta inverter feeding an induction machine. The obtained high quality of the load currents confirms the feasibility of the proposed enhanced SVPWM algorithm and the effectiveness of its implementation method on FPGA.