Hysteresis control strategy for STATCOM (Static Synchronous Compensator)

Abstract

The invention provides a hysteresis control strategy for a STATCOM (Static Synchronous Compensator). The hysteresis control strategy comprises the steps of calculating an amplitude value A of a target current i<sk>* according to a measurement voltage Uc of a capacitor group and a target voltage Uref of the capacitor group; obtaining a three-phase voltage V<abc> and a three-phase current l<abc> close to a power end at an alternating current side in real time and taking the three-phase current l<abc> as a monitoring current i<sk>; importing the three-phase voltage V<abc> into a phase-locked loop, thereby obtaining a phase angle theta<abc> of the target current i<sk>*; carrying out sine on the amplitude value A of the target current i<sk>* and the phase angle theta<abc> of the target current i<sk>*, thereby obtaining the target current i<sk>*; carrying out a difference value between the calculated target current i<sk>* and the collected monitoring current i<sk>; and sending the difference value into a hysteresis control module, thereby obtaining a triggering signal T for controlling the STATCOM. The STATCOM generates a reactive current required by a load or absorbs the reactive current released by the load according to the triggering signal T. According to the hysteresis control strategy, the current close to the power supply end of the alternating side of the STATCOM is taken as the control target, the complex process of detecting the reactive current by a traditional STATCOM control strategy is avoided, the working efficiency of the STATCOM is improved, and an error occurring possibility is reduced.

Description

technical field [0001] The present application relates to the field of power system technology, and in particular to a STATCOM hysteresis control strategy. Background technique [0002] Static Synchronous Compensator (STATCOM) is a reactive power compensation device composed of power electronic devices. figure 1 is the equivalent circuit diagram of STATCOM, such as figure 1 As shown, STATCOM is connected in parallel with the grid or between the grid and the load through the reactor. The basic components of STATCOM include: power switching device bridge and capacitor bank. The power switching device bridge circuit includes several switching tubes, which control the on-off status of the switching tubes, thereby controlling the start or stop of the STATCOM reactive power compensation work. figure 1 in, e as ,e bs ,e cs ,i as ,i bs ,i cs respectively represent the three-phase voltage and three-phase current provided by the power supply, e al ,e bl ,e cl ,i al ,i bl...

AI Technical Summary

Problems solved by technology

[0008] This application provides a STATCOM hysteresis control strategy to solve the existing STATCOM control strategy due to the need to detect reactive current, resulting in complex control process, many matrix conversion times, a large number of modules used and error-prone problems

Images