Operating Limits for Low-Capacitance Cascaded H-Bridge Static Compensators

Ezequiel Ramos Rodriguez; Ramon Leyva; Glen Ghias Farivar; Christopher David Townsend; Josep Pou

doi:10.1109/TPEL.2021.3111201

Operating Limits for Low-Capacitance Cascaded H-Bridge Static Compensators

Ezequiel Ramos Rodriguez, Ramon Leyva, Glen Ghias Farivar, Christopher David Townsend, Josep Pou

Electrical, Electronic and Computer Engineering

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

The cascaded H-bridge (CHB) low-capacitance stat- ic compensator (LC-StatCom) has a limited inductive region compared to a conventional StatCom, both in balanced and unbalanced conditions, due to the inherent large oscillations on the capacitor voltages. This paper presents a detailed analysis of the viable operating region in these converters that takes into account the inherent large oscillations. The analysis facilitates sizing of the dc-link capacitors to ensure that the StatCom is able to inject a given range of positive- and negative-sequence current. Though the analysis is generic and applicable to the CHB StatComs with relatively large capacitance values, it is more relevant in the LC-StatComs. In addition, the paper derives reference steady-state signals that can be used as feedforward terms in LC-StatCom control loops to enhance the control performance. The paper presents simulation and experimental results, in balanced and unbalanced conditions to corroborate the proposed analysis.

Original language	English
Pages (from-to)	3421-3433
Number of pages	13
Journal	IEEE Transactions on Power Electronics
Volume	37
Issue number	3
Early online date	9 Sept 2021
DOIs	https://doi.org/10.1109/TPEL.2021.3111201
Publication status	Published - 1 Mar 2022

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title = "Operating Limits for Low-Capacitance Cascaded H-Bridge Static Compensators",

abstract = "The cascaded H-bridge (CHB) low-capacitance stat- ic compensator (LC-StatCom) has a limited inductive region compared to a conventional StatCom, both in balanced and unbalanced conditions, due to the inherent large oscillations on the capacitor voltages. This paper presents a detailed analysis of the viable operating region in these converters that takes into account the inherent large oscillations. The analysis facilitates sizing of the dc-link capacitors to ensure that the StatCom is able to inject a given range of positive- and negative-sequence current. Though the analysis is generic and applicable to the CHB StatComs with relatively large capacitance values, it is more relevant in the LC-StatComs. In addition, the paper derives reference steady-state signals that can be used as feedforward terms in LC-StatCom control loops to enhance the control performance. The paper presents simulation and experimental results, in balanced and unbalanced conditions to corroborate the proposed analysis.",

keywords = "Automatic voltage control, Capacitors, Feedforward systems, Oscillators, STATCOM, Steady-state, Topology",

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AU - Rodriguez, Ezequiel Ramos

AU - Leyva, Ramon

AU - Farivar, Glen Ghias

AU - Townsend, Christopher David

AU - Pou, Josep

PY - 2022/3/1

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N2 - The cascaded H-bridge (CHB) low-capacitance stat- ic compensator (LC-StatCom) has a limited inductive region compared to a conventional StatCom, both in balanced and unbalanced conditions, due to the inherent large oscillations on the capacitor voltages. This paper presents a detailed analysis of the viable operating region in these converters that takes into account the inherent large oscillations. The analysis facilitates sizing of the dc-link capacitors to ensure that the StatCom is able to inject a given range of positive- and negative-sequence current. Though the analysis is generic and applicable to the CHB StatComs with relatively large capacitance values, it is more relevant in the LC-StatComs. In addition, the paper derives reference steady-state signals that can be used as feedforward terms in LC-StatCom control loops to enhance the control performance. The paper presents simulation and experimental results, in balanced and unbalanced conditions to corroborate the proposed analysis.

AB - The cascaded H-bridge (CHB) low-capacitance stat- ic compensator (LC-StatCom) has a limited inductive region compared to a conventional StatCom, both in balanced and unbalanced conditions, due to the inherent large oscillations on the capacitor voltages. This paper presents a detailed analysis of the viable operating region in these converters that takes into account the inherent large oscillations. The analysis facilitates sizing of the dc-link capacitors to ensure that the StatCom is able to inject a given range of positive- and negative-sequence current. Though the analysis is generic and applicable to the CHB StatComs with relatively large capacitance values, it is more relevant in the LC-StatComs. In addition, the paper derives reference steady-state signals that can be used as feedforward terms in LC-StatCom control loops to enhance the control performance. The paper presents simulation and experimental results, in balanced and unbalanced conditions to corroborate the proposed analysis.

KW - Automatic voltage control

KW - Capacitors

KW - Feedforward systems

KW - Oscillators

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JF - IEEE Transactions on Power Electronics

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Operating Limits for Low-Capacitance Cascaded H-Bridge Static Compensators

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