A New Cascaded Multi-Level Phase Structure Suitable for High-Voltage High-Power Applications

Liu, Wanxun; Sun, Sipei; Liu, Yongmin; Si, Ruihua; Mao, Yubin; Shao, Hongbo; Jia, Peng

doi:10.1109/ei2.2018.8582093

Cited by 2 publications

(4 citation statements)

References 23 publications

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“…I 1d and I 1q are the direct and quadrature of the system terminal currents, given by Equations ( 6) and (7).…”

Section: Control Strategy Approachmentioning

confidence: 99%

“…PLL is used to obtain sin θ and cos θ in the voltage Equations ( 4) and ( 5), as well as the current Equations ( 6) and (7). The dq transformation is used for obtaining the direct axis (as well as the quadrature axis) of the voltages and currents in Equations ( 4)- (7). 1d ' is fed to to the decoupled controller.…”

Section: Control Strategy Approachmentioning

confidence: 99%

“…Voltage levels with direct current control techniques are able to harvest the system stability [3,4]. The STATCOM FACTS device is being used to control losses in terms of reactive power variation and terminal voltage changes in the system [5][6][7]. Combining bridges and optimizing the number of switches results in minimum switching losses and reduces the cost in medium voltage transmission lines [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seven Level Voltage Source Converter Based Static Synchronous Compensator with a Constant DC-Link Voltage

Gadupudi

Rao²,

Devarapalli³

et al. 2021

Applied Sciences

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Flexible alternating current transmission system (FACTS) controllers are important to enhance the quality of power in power systems. The stability of a system is achieved via a FACTS device (a Static Synchronous Compensator (STATCOM)). This paper aims to control the losses in the transmission system during peak energy demand circumstances with minimal losses in the economical and functional efficiency of the system. The STATCOM operation of a seven level voltage source converter (VSC) with binary-weighted transformers is proposed for controlling the reactive power variations and terminal voltage changes at dynamic circumstances in the transmission system. The STATCOM is operated at 132 kV and is a 50 Hz AC system with a single DC-Link capacitance and two VSC power circuits. Each VSC circuit consists of three H-bridges with specific switching angle control in order to achieve low total harmonic distortion at the fundamental frequency. The coupled control circuit phenomenon is imperative for computing the switching angle for a stable performance. The dynamic functional improvement efficiency is harvested with a minimum number of switches and transformers used in high voltage and high-power applications. The number of switches, transformers, and capacitors for 132 kV are optimized with a proposed STATCOM operation in seven level VSC with binary-weighted transformers. The simulated results prove that the proposed model significantly improved system performance and stability.

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“…I 1d and I 1q are the direct and quadrature of the system terminal currents, given by Equations ( 6) and (7).…”

Section: Control Strategy Approachmentioning

confidence: 99%

Section: Control Strategy Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Seven Level Voltage Source Converter Based Static Synchronous Compensator with a Constant DC-Link Voltage

Gadupudi

Rao²,

Devarapalli³

et al. 2021

Applied Sciences

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show abstract

“…Hybrid multilevel converter-based STATCOM operations have been implemented for the elimination of voltage dips during load variations in the system [16]. The cascade submodule of half bridge structures was designed for inverter operation in high voltage and high-power applications [17]. Seven-level binary weighted transformer connected VSC-based STATCOM was made for huge power transmission systems in order to control the reactive power changes [18].…”

Section: Introductionmentioning

confidence: 99%

Fuzzy-Based Fifteen-Level VSC for STATCOM Operations with Single DC-Link Voltage

Gadupudi¹,

Rao²,

Divakar³

et al. 2023

Sustainability

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A static synchronous compensator (STATCOM) is a powerful mechanism for balancing reactive power and uplift voltage stability in a transmission system. Nowadays, the desire to save energy by reducing losses is prioritized as an essential target instead of increasing the power generation for the sustainability of any nation’s growth plans. As a result, power-electronics-based converters are more significant for power savings in transmission systems. STATCOM based on voltage source converters (VSC) are operated to improve on stable performance conditions as well as to minimize the harmonic distortions in a power system. Hence, this paper explores low harmonic distortions of fifteen-level VSC structured STACOM using only one DC-link voltage to balance the reactive power and to manage the voltage profile in large power transmission systems. STATCOM consisting of H-bridge type VSCs and binary weighted transformers was utilized to maintain an AC system voltage at 132 kV, 50 Hz. The three stages of VSCs were operated with meticulous firing angles based on converter levels for controlling THD (total harmonic distortion) and providing system improvement. The proposed model of the fifteen-level H-bridge type voltage source converters with fuzzy logic decoupled control algorithm based STATCOM can be used for large power range applications with a small number of switches. This model attained stable operation of the system with a low harmonic deviation at any dynamical conditions. The simulation results using MATLAB showed that the system’s operation was enhanced, with a smoother response and improved steady state performance.

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A New Cascaded Multi-Level Phase Structure Suitable for High-Voltage High-Power Applications

Cited by 2 publications

References 23 publications

Seven Level Voltage Source Converter Based Static Synchronous Compensator with a Constant DC-Link Voltage

Seven Level Voltage Source Converter Based Static Synchronous Compensator with a Constant DC-Link Voltage

Fuzzy-Based Fifteen-Level VSC for STATCOM Operations with Single DC-Link Voltage

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