Auto disturbance rejection control technology-based direct-current busbar voltage control method of high-voltage chain-type STATCOM (Static Synchronous Compensator) power unit module

Abstract

The invention relates to an auto disturbance rejection control technology-based direct-current busbar voltage control method of a high-voltage chain-type STATCOM (Static Synchronous Compensator) power unit module. Capacitors at the direct-current side of a chain-type STATCOM are mutually independent; the individual unit module has direct-current capacitor loss difference, switch loss difference, drive pulse delay time difference, and the like in the running process; the voltage of the direct-current capacitor of each chain-type STATCOM unit module is unbalanced and has difference, so that harmonic contents of an output voltage and an output current of the chain-type STATCOM unit module are influenced, even the normal and safe operation of the chain-type STATCOM unit module is endangered. According to the method disclosed by the invention, an auto disturbance rejection controller does not need to judge the instantaneous current direction; after parameters are accurately set, the disturbance quantity contains active components with active fluctuation; and the auto disturbance controller can achieve the purposes of high response speed and no overshoot of voltage of the unit direct-current capacitors due to the existence of a tracking differentiator and a nonlinear controller.

Description

technical field [0001] The invention relates to a high-voltage chained STATCOM power unit module DC bus voltage control method, mainly refers to a high-voltage chained STATCOM power unit module DC bus voltage control method based on active disturbance rejection control technology, and belongs to the technical field of electrical automation equipment. Background technique [0002] The chain-type converter is also called H-bridge series converter. Various converter devices, such as high-voltage variable frequency governor (MVD), new static synchronous compensator (STATCOM), new energy power generation inverter, dynamic voltage recovery period (DVR), active filter (APF), etc. [0003] The new static synchronous compensator (STATCOM) using chain-type converter is also called chain-type static synchronous compensator, and its single H-bridge converter is also called chain link. When the chain-type synchronous compensator directly outputs a high voltage above 6KV, due to the with...

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Problems solved by technology

[0011] 1. When the load is small, the instantaneous current direction is difficult to distinguish, which has a direct impact on the duty cycle component of the PI controller outlet compensation, directly affecting the no-load current

[0012] 2. There is a direct contradiction between the response speed of the PI regulator and the overshoot of the DC capacitor voltage contr

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