scholarly journals Design and Control of 3-phase, 4-wire, 4-Leg VSC Based DSTATCOM using Synchronous Reference Frame Theory

2019 ◽  
pp. 76-81
Author(s):  
Digambar Singh
Keyword(s):  
Reference Frame ◽  
Control Algorithm ◽  
Synchronous Reference Frame ◽  
Voltage Controller ◽  
Linear Load ◽  
Three Phase ◽  
Unbalanced Load ◽  
Non Linear Load ◽  
And Control ◽  
Load Simulation

This paper presents three-phase, four-leg, VSI based AC shunt D-STATCOM feeding AC voltage controller having resistive-inductive (RL) load for reducing the harmonic current and to maintain UPF using Synchronous Reference Frame (SRF) based control algorithm. This theory is employed to calculate compensating current while the three phase source is feeding a non-linear load. Simulation is performed for an unbalanced load in PFC mode in MATLAB environment using sim-power system (SPS) toolbox.

scholarly journals Improvement of DSOGI PLL Synchronization Algorithm with Filter on Three-Phase Grid-connected Photovoltaic System

2018 ◽  
Vol 18 (1) ◽  
pp. 35 ◽  
Author(s):  
Rofiatul Izah ◽  
Subiyanto Subiyanto ◽  
Dhidik Prastiyanto
Keyword(s):  
Reference Frame ◽  
Frequency Estimation ◽  
Photovoltaic System ◽  
Positive Sequence ◽  
Pv System ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Synchronous Reference Frame ◽  
Three Phase ◽  
Low Pass

Synchronous Reference Frame Phase Locked Loop (SRF PLL) has been widely used for synchronization three-phase grid-connected photovoltaic (PV) system. On the grid fault, SRF PLL distorted by negative sequence component and grid harmonic that caused an error in estimating parameter because of ripple and oscillation. This work combined SRF PLL with Dual Second Order Generalized Integrator (DSOGI) and filter to minimize ripple and minimize oscillation in the phase estimation and frequency estimation. DSOGI was used for filtering and obtaining the 90o shifted versions from the vαβ signals. These signals (vαβ) were generated from three phase grid voltage signal using Clarke transform. The vαβ signal was the inputs to the positive-sequence calculator (PSC). The positive-sequence vαβ was transformed to the dq synchronous reference frame and became an input to SRF-PLL to create the estimation frequency. This estimation frequency from SRF PLL was filtered by the low-pass filter to decrease grid harmonic. Moreover, the output of low-pass filter was a frequency adaptive. The performance of DSOGI PLL with filter is compared with DSOGI PLL, SRF PLL, and IEEE standard 1547(TM)-2003. The improvement of DSOGI PLL with filter gave better performances than DSOGI PLL and SRF PLLbecause it minimized ripples and oscillations in the phase and frequency estimations.

Experimental verification of DSTATCOM for various non-linear load

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Pushpanjali Shadangi ◽  
Sushree Diptimayee Swain ◽  
Pravat Kumar Ray ◽  
Gayadhar Panda
Keyword(s):  
Fuzzy Logic Controller ◽  
Harmonic Distortion ◽  
Pattern Generation ◽  
Total Harmonic Distortion ◽  
Synchronous Reference Frame ◽  
Linear Load ◽  
Hysteresis Controller ◽  
Frame Method ◽  
Non Linear Load ◽  
Static Compensator

Abstract This paper elaborates a hybrid synchronous reference frame method has been proposed for the distribution static compensator (DSTATCOM) to enhance the compensation performance. This controller is designed in such a way that it generate the reference with respect to the change in load to reject the harmonics. Furthermore, a hysteresis controller is employed for switching pattern generation. Fuzzy logic controller is also implemented in MATLAB/simulink environment here to analyze the total harmonic distortion. Experimental analysis of the DSTATCOM demonstrates the potency and reliability of proposed controller over existing control strategy in the from of total harmonic distortion.

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