Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 3, Pages 3421-3433Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3111201
Keywords
Capacitors; Automatic voltage control; Oscillators; Steady-state; Feedforward systems; Topology; STATCOM; Cascaded H-bridge (CHB); circulating current injection; compensation region of negative-sequence currents; multilevel converter; static compensator (STATCOM); thin dc capacitor
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Funding
- Office of Naval Research Global [N62909-19-1-2081]
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This article presents a detailed analysis of the viable operating region for the cascaded H-bridge low-capacitance static compensator (LC-StatCom) in both balanced and unbalanced conditions. It provides a method for sizing the dc-link capacitors and derives reference steady-state signals for control loops.
The cascaded H-bridge (CHB) low-capacitance static 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 article 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 article derives reference steady-state signals that can be used as feedforward terms in LC-StatCom control loops to enhance the control performance. The article presents simulation and experimental results, in balanced and unbalanced conditions to corroborate the proposed analysis.
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