Design and Research on High-Reliability HPEBB Used in Cascaded DSTATCOM

Yang, Kun; Wang, Yue; Chen, Guozhu

doi:10.6113/jpe.2015.15.3.830

Cited by 3 publications

(3 citation statements)

References 16 publications

(6 reference statements)

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“…To stabilize the power grid, many types of handling equipment must be installed to clean the power grid at the customer's end. Among these equipment, static var generator (SVG) has the most application in improving the power quality by advantages such as continuous compensation, fast regulation, wide operating range, and fixed repetition of harmonic compensation [4][5][6][7] .…”

Section: Introduction1mentioning

confidence: 99%

Direct current control strategy of SVG based on dual sequence dq coordinates under asymmetric load condition

Zheng

Cao

2019

Chin. J. Electr. Eng.

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In the case of asymmetric loads of power grid, load currents are composed of four components: positive sequence active and reactive components and negative sequence active and reactive components that can pollute the power grid with harmonics and reactive power and interrupt the normal operation of power grid. Therefore, increasing numbers of static var generators (SVGs) are used to stabilize the power grid. In this study, a new type of current compensation control strategy of a three-phase three-wire SVG under an asymmetric load is proposed. According to the symmetric component method and dual dq synchronous transformation theory, the load currents are transformed into four components under dual dq coordinates. Each component is compensated separately by the SVG. Simultaneously, the proportional-limiter method is adopted to minimize the harmonics from the SVG by optimizing the waveform of the modulation wave and limiting its amplitude. Finally, the validity and feasibility of the control strategy are verified by simulation and experimental results.

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Section: Introduction1mentioning

confidence: 99%

Direct current control strategy of SVG based on dual sequence dq coordinates under asymmetric load condition

Zheng

Cao

2019

Chin. J. Electr. Eng.

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“…15 It is worth mentioning that many researchers use conventional cascade topology to build a multilevel STATCOM. 16 In contrast to the cascade topology, some switches in this configuration do not need to work in high frequency. Implementing a current mode controller on a multilevel inverter is also a challenge due to more output voltage levels that need to be considered.…”

mentioning

confidence: 99%

Application of current control on RV multilevel static compensator for sag mitigation

Najafi

Yatim

Mirzaei

et al. 2021

Int Trans Electr Energ Syst

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This paper proposes the application of a current mode control on a static compensator (STATCOM). The proposed method uses constant switching frequency. Hence, dominant switching harmonics are filtered easily. This approach is also simple and does not need complex calculations. As a result, it will be an ideal candidate for the implementation of controllers or FPGAs. It should be noted that a single-phase five level reversing voltage (RV) inverter is selected for the STATCOM. The topology has superiorities over conventional multilevel topologies in terms of the control circuit, switching frequency, and the number of components. The simulation results by MATLAB/Simulink prove successful mitigation of voltage sag by the proposed approach. A prototype based on the proposed method is also developed and examined successfully to evaluate voltage sag mitigation. The harmonic spectrum of the STATCOM is also presented to illustrate the equipment compatibility with IEEE 519 harmonic standard.

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“…Recently, grid-connected converters are considered a key enabling technology to realize distributed generation (solar and wind) interfaces [1], [2], static var generator [3], and active power filters [4]. With the continuous spread of these devices, multiple low-power transformers and long transmission lines are used to connect these devices to the public grid because of the scattered locations of the distributed generation and nonlinear loads.…”

Section: Introductionmentioning

confidence: 99%

BPF-based Grid Voltage Feedforward Control of Grid-connected Converters for Improving Robust Stability

Yang¹,

Tong²,

Yin³

et al. 2017

Journal of Power Electronics

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Grid voltage feedforward is extensively used for controlling grid-connected converters. However, the conventional voltage feedforward control reduces the stability margins of the converter connected to a high-impedance grid. The effect mechanism of voltage feedforward on the grid-connected converter control under high-inductive conditions of the grid impedance is clearly explained in this study using the equivalent transformations of control block diagrams. Results show that the delay produced by the digital control is the root cause of this effect. An improved voltage feedforward strategy, in which a bandpass filter (BPF) is introduced into the feedforward path, is proposed to strengthen the converter's robust stability against grid impedance variations. The selection method of the BPF's bandwidth is also provided considering the tradeoff between the response speed to the grid voltage sag and the system's robust stability. The converter can work stably over a wide range of the grid impedance through the proposed approach. Simulation and experimental results fully verify the effectiveness of the BPF-based voltage feedforward strategy.

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Design and Research on High-Reliability HPEBB Used in Cascaded DSTATCOM

Cited by 3 publications

References 16 publications

Direct current control strategy of SVG based on dual sequence dq coordinates under asymmetric load condition

Direct current control strategy of SVG based on dual sequence dq coordinates under asymmetric load condition

Application of current control on RV multilevel static compensator for sag mitigation

BPF-based Grid Voltage Feedforward Control of Grid-connected Converters for Improving Robust Stability

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