Online computation of error band for hysteresis current controlled reactive current compensators

Sandeep, J.; Ashok, S.; Ramchand, Rijil

doi:10.1109/pedes.2016.7914441

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Assuming that the output of the three phase inverter connected to inductance and resistance, the mathematical model of the output is established based on Figure 1 is as shown in (2) [4].…”

Section: Mathematical Model Of Three Phase Invertermentioning

confidence: 99%

A three phase photovoltaic grid tied inverter system control based on t-s fuzzy equalization

Abed¹

2019

IJPEDS

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<p>This paper proposed a Takagi-Sugeno fuzzy control method is used to build the model for current controlled of three phase photovoltaic inverter. The three phase inverter connected to grid with L filter. The DC link capacitor is splatted midpoint of three phase four wire and the DC link voltage in the input side of the inverter is considered as input variables value for maximum value of the reference current for the feedback controlled. The proposed of T-S fuzzy control method and hysteresis current control can solve and enhance the THD of the output current of the inverter. The T-S fuzzy is designed to monochrome controller makes the output currents are balanced and decrease the harmonic compensation of the full system. The Matlab simulations and test results show the THD, current and the voltage of the three photovoltaic inverter under T-S fuzzy controller method is current balancing efficiency. The control unit is capable of carrying out operation in good condition, dynamic characteristics stable and high quality.</p>

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“…Assuming that the output of the three phase inverter connected to inductance and resistance, the mathematical model of the output is established based on Figure 1 is as shown in (2) [4].…”

Section: Mathematical Model Of Three Phase Invertermentioning

confidence: 99%

A three phase photovoltaic grid tied inverter system control based on t-s fuzzy equalization

Abed¹

2019

IJPEDS

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“…An easier sector identification method for vector calculation in CESP‐based online computation HCC is validated in [26]. Moreover, an online current error boundary computation technique for shunt compensators is presented in [27] with voltage error vector evaluated using the conventional trigonometric relations, which incur high computational complexity. An online modification of parabolic boundary driven CESP‐based HCC by using sampled magnitudes of reference phase voltages for induction motor drive is introduced in [28, 30, 31].…”

Section: Introductionmentioning

confidence: 99%

Investigations on STATCOM using current error space phasor based modified hysteresis current controller

Raju

Cheriyan

Ramchand

2020

IET Generation Trans & Dist

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A STATCOM that employs a nearly constant switching frequency hysteresis current controlled VSI is presented in this paper. Hysteresis controller enhances the dynamic performance of STATCOM. The switching frequency variations associated with the conventional hysteresis current controller is reduced by using a variable hysteresis boundary. Variable hysteresis boundary is predetermined by the current error, based on the sampled magnitudes of the reference voltage vector. This makes the switching frequency nearly constant and switching vector selection optimal. As a result, a voltage FFT profile similar to that of a space vector modulated STATCOM is obtained. Choosing a space vector based reference voltage vector keeps the current error within the pre-calculated boundaries and improves the current tracking capability of STATCOM. The systematic method of selecting a switching sequence avoids random switching. Effectiveness of the proposed method for the control of grid-connected STATCOM is experimentally verified and compared with a voltage-controlled space vector modulated voltage source inverter based STAT-COM. The hardware implementation of the controller for grid-connected STATCOM is carried out in OPAL-RT real-time simulator platform and experimentally validated for a three-phase balanced load of 5 kVA.

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“…Multilevel inverter based shunt active filter application is discussed in 28 with CESP based HCC in which hexagonal boundary is selected to reduce the current error deviations. Moreover, in 29 , the online current error boundary computation technique reported in 26 is used for shunt compensators in which voltage error vector evaluation incurs high computational complexity.…”

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confidence: 99%

Modified hysteresis current controller for cascadedH‐Bridgeinverter–basedSTATCOM

Raju

Cheriyan

Ramchand

2021

Int Trans Electr Energ Syst

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A modified hysteresis current controller to achieve nearly constant switching frequency operation for a cascaded H bridge inverter based STATCOM is the focus of this article. The varying switching frequency characteristics of conventional hysteresis current controller for grid connected systems is a threat to the other loads, despite of the fast transient response offered. A constant switching frequency operation imparts a proper current filtering action and quick current tracking in grid connected systems. The modified hysteresis controller using variable hysteresis boundary proposed in this article contributes constant switching frequency characteristics without compromising the dynamic performance of the system. The variable hysteresis boundary is determined from the computed values of current error, and this computation is based on the sampled values of reference voltage vector. The boundary computation is embedded in the space vector modulation of inverter to ensure optimal switching vector selection. When compared to the conventional two-level voltage source inverters, multilevel inverters have enhanced power capability and quality. The hysteresis current controller described in this article is designed for a cascaded H-bridge inverter based STATCOM to achieve a voltage fast fourier transform (FFT) profile similar to that of a space vector modulated cascaded H-bridge inverter. The three-level cascaded H-bridge inverter based STATCOM with proposed current control strategy has better steady-state performance, faster dynamic performance, and constant switching frequency characteristics as compared to a voltage controlled space vector modulated three-level cascaded H-bridge inverter based STATCOM, which is experimentally substantiated. The hardware implementation of the controller for the STATCOM of rating 5 kVA is carried out on OPAL-RT real-time simulator platform and is validated experimentally for a three-phase balanced load.

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Online computation of error band for hysteresis current controlled reactive current compensators

Cited by 3 publications

References 6 publications

A three phase photovoltaic grid tied inverter system control based on t-s fuzzy equalization

A three phase photovoltaic grid tied inverter system control based on t-s fuzzy equalization

Investigations on STATCOM using current error space phasor based modified hysteresis current controller

Modified hysteresis current controller for cascadedH‐Bridgeinverter–basedSTATCOM

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