Charging control method of STATCOM (Static Synchronous Compensator) system
A charging control method and voltage technology, which is applied in the direction of current collectors, electric vehicles, electrical components, etc., can solve the problems of unbalanced sub-module voltage, increased device loss, high-frequency harmonics, and low sub-module voltage, so as to improve long-term operation Reliability, the effect of reducing device switching loss
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[0016] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0017] Such as figure 1 As shown, it is a system applying the charging control method of the present invention, which can be used in the start-up phase before the grid-connection and unlocking of the system and the temporary grid-connection phase during the system operation.
[0018] The present invention provides a charging control method for a STATCOM system, which is suitable for the main loop structure of the three-phase chained H-bridge cascaded sub-modules. The three-phase sub-modules are independently controlled and circulated in turn. Taking any phase as an example, as shown in the attached figure 2 shown, including the following steps:
[0019] (1) In the first stage, select the first N sub-modules with the highest voltage from the sub-modules, where N≥1; and issue an IGBT bypass command so that these sub-modules are not charged,...
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