Simulation of active scheme Three Phase to Seven Phase Transformation using Special condition Transformer Connection

The object in this paper to boost a 3 to 7 phase AC multiphase transformers to converted into DC power through modeling and simulation. A new technique of pure seven-phase Sine-wave of fixed current/voltage and frequency is obtained now we have also used f R-L load and motor testing purposes. Here complete modeling has been simulated by using MATLAB Software. Multi-winding transformer block was taken from the sim-power system block library and turn ratios set in the dialog box then simulated. The design and simulation presented in this paper. Seven phase transmission line system can be developed for the generation of bulk power transfer. As per need of the induction motor under a loaded condition is used for the viability of transformation system. In seven phase’s, each phases shifted from the order by 51.42° (360°/7) and got the Sine-wave current/voltage. The novel scheme connection was expanded by using the modeling and simulation approach to prove the viability of the implementation and this type of transformer is required in aerospace engineering, railway engineering and automobile engineering applications.

The object in this paper to boost a 3 to 7 phase AC multiphase transformers to converted into DC power through modeling and simulation. A new technique of wave of fixed current/voltage and frequency is obtained now we have also used for L load and motor testing purposes. Here complete modeling has been simulated by using MATLAB winding transformer block was taken power system block library and turn ratios set in the dialog box then simulated. The design nd simulation presented in this paper. Seven phase transmission line system can be developed for the generation of bulk power transfer. As per need of the induction motor under a loaded condition is used for the viability of transformation system. In seven phase's, each phases shifted from the order by 51. 42° wave current/voltage. The novel scheme connection was expanded by using the modeling and simulation approach to prove the viability of the implementation and this type of sformer is required in aerospace engineering, railway engineering and automobile engineering Multiphase system, Multiphase Seven phases, Multi-

INTRODUCTION
The electric power from one circuit to another without changing a frequency and their mutual induction between two circuits linked by a common magnetic fluxes then this phenomenon is known as transformer [1]. It is an important element in the development of high-voltage electric power transmission line. It can be classified into various types viz. step up, step down and matching transformer [2]. Multiphase i.e. More than three phase systems are recently seen of their inherent advantage compared to the three phase counterparts. It has applicability of explored to electric power generation in multiphase systems [3 transmission [4-6] and utilization [7 on seven-phase transmission line system was initiated due to the increasing a rising cost of right way for a transmission corridors, environmental program, and various stringent licensing laws [9]. Six transmission lines can provide the same power capacity with a lower line voltage and smaller towers as compared to a standard double circuit three line [4]. The dimension of the six towers may also lead to the reduction of magnetic fields and electromagnetic interference [9 Generally no load test, blocked rotor and load tests are performed on a motor to determine its parameters. one circuit to another without changing a frequency and their mutual induction between two circuits linked by a common magnetic fluxes then this phenomenon is known as transformer [1]. It is an important element in the development of power transmission line. It can be classified into various types viz. step up, step down and matching transformer [2]. Multiphase i.e. More than three phase systems are recently seen of their inherent advantage compared to the three phase has applicability of explored to electric power generation in multiphase systems [3][4][5] 6] and utilization [7][8]. The research phase transmission line system was initiated due to the increasing a rising cost of right way for a mission corridors, environmental program, and various stringent licensing laws [9]. Six-phase transmission lines can provide the same power capacity with a lower line voltage and smaller towers as compared to a standard double circuit three-phase The dimension of the six-phase smaller towers may also lead to the reduction of magnetic fields and electromagnetic interference [9][10]. Generally no load test, blocked rotor and load tests are performed on a motor to determine its parameters.

Fig. 1 Block diagram representation
We know that multi-phase motors are invariably supplied by ac/dc/ac converters. The multiphase electric drive is limited for the modeling and controls the supply systems [14]. Our main objective is to develop static transformation system to change the phase number from three to seven (where n>3). Now we are generating a novel phase transformation system which convert three phase to a seven supply [15]. In multiphase system six phases and twelve phases is found to produce fewer ripples with a high frequency in an AC-DC rectifier system. Thus six and twelve phase transformers are designed to feed a number of pulses rectifier system and technology has matured [13]. Now, twenty four phase and thirty six phase transformer systems have proposed for supplying a number of pulse rectifier systems [12][13][14][15][16]. These designs are also available for an odd number of phases, such as five, nine and eleven etc. In this paper we have proposed a special transformer connection scheme to get a seven output supply from three-phase. The expected applications of the power transformer are the electric power transmission system and power electronic converters and the multiphase electric drive system. The block represented of the proposed system is shown in figure 1.The fixed voltage and fixed frequency available grid supply can be transformed to the fixed frequency seven-phase output supply. The output may be made variable by inserting the autotransformer at the primary side.  . Our main objective is to develop static transformation system to change the e number from three to seven (where n>3). Now we are generating a novel phase transformation system which convert three phase to a seven-phase supply [15]. In multiphase system six phases and twelve phases is found to produce fewer ripples with a DC rectifier system. Thus six and twelve phase transformers are designed to feed a number of pulses rectifier system and technology has matured [13]. Now, twenty four phase and thirty six phase transformer systems have a number of pulse rectifier 16]. These designs are also available for an odd number of phases, such as five, nine and eleven etc. In this paper we have proposed a special transformer connection scheme to get a seven-phase phase. The expected applications of the power transformer are the electric power transmission system and power electronic converters and the multiphase electric drive system. The block represented of the proposed system is oltage and fixed frequency available grid supply can be transformed to phase output supply. The output may be made variable by inserting the autotransformer at the primary side. The input and output supply can be arranged in the following manner [20] as below. Input Star, Output Star. Input Star, Output heptagon. Input Delta, Output Star. Input Delta, Output heptagon. The input has being three phase system the windings are connected in a usually fashion. The (seven phase) heptagon connection may be derived following a similar approach. The output/secondary side connection is discussed in the following subsections.

WINDING ARRANGEMENT FOR SEVEN PHASE STAR OUTPUT
Three separate iron cores are designed with each of them carrying one primary and four secondary coils, except in one core where five secondary coils are wound. Six terminals of primaries are connected in an appropriate manner resulting in star and/or delta connections, and the 26 terminals of secondaries are connected in a different fashion resulting in a star or heptagon output. The connection scheme of secondary windings to obtain star output is illustrated in Figs. 1 and 2 and the corresponding phasor diagram is illustrated in Fig. 3. The construction of output phas with requisite phase angles of 360/7 = 51.43 each phase is obtained using appropriate turn ratios and the governing phasor equation is illustrated in (1c). The turn ratios are different in each phase as shown in Fig. 1. The choice of turn ratio creating the requisite phase displacement in the output phases. The turn ratios between different phases are given in Table I. The input phases are designated with letters "X," "Y," and "Z" and the output are designated with letters "a," "b, "g. Star, Output heptagon. Input Delta, Output Star. Input Delta, Output heptagon. The input has being threephase system the windings are connected in a usually fashion. The (seven phase) heptagon output connection may be derived following a similar approach. The output/secondary side connection is discussed in the following subsections.

WINDING ARRANGEMENT FOR SEVEN-
Three separate iron cores are designed with each of g one primary and four secondary coils, except in one core where five secondary coils are wound. Six terminals of primaries are connected in an appropriate manner resulting in star and/or delta connections, and the 26 terminals of secondaries are in a different fashion resulting in a star or heptagon output. The connection scheme of secondary windings to obtain star output is illustrated in Figs. 1 and 2 and the corresponding phasor diagram is illustrated in Fig. 3. The construction of output phases with requisite phase angles of 360/7 = 51.43• between each phase is obtained using appropriate turn ratios and the governing phasor equation is illustrated in (1c). The turn ratios are different in each phase as shown in Fig. 1. The choice of turn ratio is the key in creating the requisite phase displacement in the output phases. The turn ratios between different phases are given in Table I. The input phases are designated with letters "X," "Y," and "Z" and the output are designated with letters "a," "b," "c," "d," "e," "f," and International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456 @ IJTSRD | Available Online @ www.ijtsrd.com

STIMULATION RESULTS
The new designed/modeling is the first using "Sim power system" block set of the MATLAB/Simulink software. Multiwinding transformer block is chosen from the sim-power system block library and the turn ratios are set in the dialog box and the simulation is run. The resulting input and output voltage and current waveform are given in star-star and for deltastar. The output will be unbalance if input is unbalanced and also if the input is balance then output is also balance. The three phase output from a seven phase input supply can also be obtain in similar fashion. 1. Matlab model

Output waveform
International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470 @ IJTSRD | Available Online @ www.ijtsrd.com | Volume -2 | Issue -3 | Mar-Apr 2018 Page: 475 CONCLUSION This paper proposes a new transformer connection scheme to transform the three-phase grid power to a seven-phase output supply. The connection scheme and the phasor diagram, along with the turn ratios, are illustrated. The successful implementation of the proposed connection scheme is elaborated upon using both simulation and experimentation. It is expected that the proposed connection scheme can be used in drives and other multiphase applications, e.g., ac-ac and dc-ac power conversion systems