Tuned‐TSC based SVC for reactive power compensation and harmonic reduction in unbalanced distribution system

Das, Sankar; Chatterjee, Debashis; Goswami, S. K.

doi:10.1049/iet-gtd.2017.0033

Cited by 29 publications

(13 citation statements)

References 48 publications

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“…Equation (4) shows that both positive-sequence reactive components and negative-sequence components of the three-phase grid side currents are 0 at this time, and only positive-sequence active components are left at the grid side.…”

Section: Relationship Between Power Factor Correction and Imbalance Smentioning

confidence: 99%

“…Elements which may be used to make SVC typically include thyristor-controlled reactor (TCR) and thyristor-switched capacitor (TSC). In [4,5], The innovations of this paper can be described as follows: In Section 2, the relationship between power factor correction and load imbalance suppression in three-phase three-wire system is analyzed. In Section 3, the theoretical compensation ability of the D-CAP for negative-sequence current is derived.…”

Section: Introductionmentioning

confidence: 99%

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Reactive Power Compensation and Imbalance Suppression by Star-Connected Buck-Type D-CAP

et al. 2019

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Reactive power and negative-sequence current generated by inductive unbalanced load will not only increase line loss, but also cause the malfunction of relay protection devices triggered by a negative-sequence component in the power grid, which threatens the safe operation of the power system, so it is particularly important to compensate reactive power and suppress load imbalance. In this paper, reactive power compensation and imbalance suppression by a three-phase star-connected Buck-type dynamic capacitor (D-CAP) under an inductive unbalanced load are studied. Firstly, the relationship between power factor correction and imbalance suppression in a three-phase three-wire system is discussed, and the principle of D-CAP suppressing load imbalance is analyzed. Next, its compensation ability for negative-sequence currents is determined, which contains theoretical and actual compensation ability. Then an improved control strategy to compensate reactive power and suppress imbalance is proposed. If the load is slightly unbalanced, the D-CAP can completely compensate the reactive power and negative-sequence currents. If the load is heavily unbalanced, the D-CAP can only compensate the positive-sequence reactive power and a part of the negative-sequence currents due to the limit of compensation ability. Finally, a 33 kVar/220 V D-CAP prototype is built and experimental results verify the theoretical analysis and control strategy.

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Section: Relationship Between Power Factor Correction and Imbalance Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reactive Power Compensation and Imbalance Suppression by Star-Connected Buck-Type D-CAP

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Compared with the static var compensator (SVC), which is a dynamic reactive power compensator, the SVG is widely used in improving the power quality due to its advantages, such as fast compensation time and continuous compensation. Therefore, SVG is currently a better way to solve the above-mentioned client power quality problem [8][9][10] . In Ref.…”

Section: Introductionmentioning

confidence: 99%

A novel soft-start method for SVG based on D-axis orientation

Zheng

Shu

et al. 2021

Chin. J. Electr. Eng.

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In this paper, a novel method for shock-free soft-start is proposed. The novel method can realize the aim of no-overshoot and inrush of current during the entire soft-start process, thus the start process is safe, stable, and reliable. When the uncontrolled rectification stage ends, a sinusoidal signal synchronized with the grid voltage is generated through dq coordinate transformation and D-axis orientation, then the signal is transmitted to the three-phase inverter bridge. The AC voltage output of the inverter bridge is superimposed on both ends of the soft-start resistor along with the grid. The open-loop control method is adopted to gradually reduce the modulation ratio of the sinusoidal PWM wave until the capacitor voltage on the DC side reaches the rated voltage value, then the soft-start resistor is removed, which means the shock-free soft-start process is completed. Experimental results prove the effectiveness and feasibility of the control strategy proposed in this paper.

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“…In Das et al, the authors introduced the use of two SVCs, one with Y configuration and the other with Δ configuration, to perform three functions: balancing a three‐phase load in four wire system, compensating the neutral current, and correcting power factor with harmonic minimization. Furthermore, the optimum firing angles for the TCRs were determined on the basis of harmonic minimization.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the response of thyristor‐controlled reactor using neural network

Ragab

Ghaeb

Al‐Naimi

2019

Int Trans Electr Energ Syst

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Summary In this paper, a neural network controller is proposed to retrieve the voltage balancing conditions in three‐phase power systems. The neural network is suggested to calculate the required set of firing angles for the thyristor‐controlled reactor accurately to balance the three‐load voltages quickly. The proposed controller is fed by different parameters within different feeding techniques, namely, root mean square (RMS) values of the three load voltages, RMS value of the space vector signal calculated from the three load voltages, and the RMS values of both the three load voltages and their associated space vector. The intentions of the proposed techniques are to combine between reducing the number of measured parameters and providing the controller with qualitative data about system status. The influence of the measured parameters on the neural network performance is examined by calculating the regression coefficients through several test cases. Accordingly, only the effective parameters are utilized to reduce the neural network complexity and to enhance the controller response time. Additionally, the calculations of the controller input parameters are made in terms of space vector cycle, which is half of system sinusoidal cycle. Consequently, the calculation time is reduced significantly. The Aqaba‐Qatrana‐South Amman power system is considered and modeled as a real case study. In addition, several test cases have been conducted to test and validate the ability of the proposed neural network controller in retrieving the voltage balance conditions precisely and quickly. The results have revealed the ability of the proposed neural network controller to calculate the firing angles quickly within 10 milliseconds and achieve very low voltage unbalance factor.

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Tuned‐TSC based SVC for reactive power compensation and harmonic reduction in unbalanced distribution system

Cited by 29 publications

References 48 publications

Reactive Power Compensation and Imbalance Suppression by Star-Connected Buck-Type D-CAP

Reactive Power Compensation and Imbalance Suppression by Star-Connected Buck-Type D-CAP

A novel soft-start method for SVG based on D-axis orientation

Enhancing the response of thyristor‐controlled reactor using neural network

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