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...

AI Technical Summary

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 control, and it is difficult to achieve both fast response and regulation voltage overshoot

[0013] Due to the high-order strong coupling between the DC voltage of the adjustment object and the control object in this system (DC voltage, switching delay, parallel loss, parasitic parameters, etc.), the control of the PI regulator has overshoot and oscillation near the stable point

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