A configuration and control method of cascade H-bridge STATCOM

Hatano, Nobuhiko; Ise, Toshifumi

doi:10.1109/pes.2008.4596240

Cited by 35 publications

(21 citation statements)

References 10 publications

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“…, where m = a, b, c (13) and the its voltage utilization can be derived by the converter's output and the defined dc capacitor voltage at bridge cell. Besides, in this discussion, the dc capacitor voltage is defined as 1.34/N times of peak value of ac voltage.…”

Section: Discussionmentioning

confidence: 99%

Zero-Sequence Voltage Injection for DC Capacitor Voltage Balancing Control of the Star-Connected Cascaded H-Bridge PWM Converter Under Unbalanced Grid

Chen

Lee

et al. 2015

IEEE Trans. on Ind. Applicat.

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This paper presents an dc capacitor voltage balancing control method for the star-connected cascaded H-bridge PWM converter in the static synchronous compensator (STAT-COM) applications. With the zero-sequence voltage injection as a basis for dc capacitors voltage balancing, this paper investigates the detailed power flow of the converter as a whole and within individual modules under unbalanced grid voltages, and then proposes a method to control the reactive power output and the dc capacitors voltage by precisely managing the power flow. This approach enhances the low voltage ride-through capability, which is very critical as the penetration of distributed energy resources grows rapdily. The proposed control method is verified by a scale down prototype in the laboratory. Index Terms-Modular Multilevel Cascaded Converter, PWM cascaded converter, STATCOM, Capacitor voltage balancing control, Low-voltage ride-through (LVRT), Zero-sequence voltage injection 0093-9994 (c)

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Section: Discussionmentioning

confidence: 99%

Zero-Sequence Voltage Injection for DC Capacitor Voltage Balancing Control of the Star-Connected Cascaded H-Bridge PWM Converter Under Unbalanced Grid

Chen

Lee

et al. 2015

IEEE Trans. on Ind. Applicat.

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“…It is already known that both zero-sequence and negative-sequence voltages can be used to adjust active power [14,[17][18][19]. However, none of literatures have mathematically compared the adjustment capabilities of them.…”

Section: Active Power Adjustment Capabilities Comparison Of Zero-sequmentioning

confidence: 99%

“…The three-phase average active and reactive power under unbalanced grid voltage sag conditions can be expressed as follows [14] (see equation (9) at the bottom of the next page) where…”

Section: Control Scheme Of the Input Stagementioning

confidence: 99%

“…A novel reference current in the current controller is proposed for balancing three-phase dc voltages under unbalanced conditions in this paper. Compared with the reference current presented in [14], the value of proposed reference current can be rapidly adjusted to improve the dynamic response of the system and reduce the dc-link voltage deviations when unbalanced grid voltage happens. Fig.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and control of electronic power transformer with star‐configuration under unbalanced conditions

Tian

Mao

Wang

et al. 2015

IET Electric Power Applications

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The active power adjustment capabilities of zero-sequence and negative-sequence voltages are mathematically compared in this study. Based on the comparison, the input currents and operating range of the electronic power transformer (EPT) using negative-sequence voltages under unbalanced grid voltage conditions have been analysed, which can provide theoretical guidance on the design and control of the EPT. A novel reference current in the input stage is proposed for balancing three-phase dc voltages. The proposed reference current can be rapidly adjusted to improve the dynamic response of the system and reduce the dc-link voltage deviations when unbalanced grid voltage happens. These analysis and control schemes are supported by both simulation and experimental validation.

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“…The most widely used control technique is proportion integration (PI) controllers [4][5][6]. PI controllers have been designed to regulate the ac system voltage and the dc capacitor voltage based on decoupled control of d-q axis currents and voltages.…”

Section: Introductionmentioning

confidence: 99%

An Advanced Control and Extensible Configuration for Static Var Generator

Zhang

Cui

et al. 2016

Mathematical Problems in Engineering

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An extensible configuration is proposed for static var generator (SVG) with advanced controller included for reactive power compensation of grid. Compared with the traditional configurations, the major advantage of such system configuration is that the power modules are very flexible and easy to extend or reduce without changing the main equipment of SVG under the different voltage levels. Furthermore, in order to solve the problems of modeling uncertainty, nonlinearities, and outside disturbance by using proportion integration (PI) controller, an advanced controller is proposed based on auto disturbance rejection control (ADRC). By controlling the amount and direction of reactive current, the reactive power is generated or absorbed from SVG into power grid with fast response, which can realize the excellent dynamic compensation for both the internal and external interferences. Simulations results show that the proposed controller has better performance of the transient and steady state than PI controller. Moreover, the verification tests are executed in 380 V, 6.5 kVA experiment systems, suggesting that the excellent dynamic performance and strong robustness are achieved.

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A configuration and control method of cascade H-bridge STATCOM

Cited by 35 publications

References 10 publications

Zero-Sequence Voltage Injection for DC Capacitor Voltage Balancing Control of the Star-Connected Cascaded H-Bridge PWM Converter Under Unbalanced Grid

Zero-Sequence Voltage Injection for DC Capacitor Voltage Balancing Control of the Star-Connected Cascaded H-Bridge PWM Converter Under Unbalanced Grid

Analysis and control of electronic power transformer with star‐configuration under unbalanced conditions

An Advanced Control and Extensible Configuration for Static Var Generator

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