Аналіз процесу керування STATCOM за швидких змін напруги

Abstract

The article investigates the processes of STATCOM control under conditions of rapid voltage changes. The main purpose of STATCOM application is reactive power compensation, which contributes to improving the quality of electricity, in particular, reducing voltage fluctuations. The modes of passive and active reactive power compensation are considered. Mathematical models are presented that describe the dependence of the voltage in the load node on the parameters of the compensator and the power source. It is shown that in the passive reactive power compensation mode, which assumes the absence of reactive power regulation at a fixed value of the synchronous compensator voltage, the voltage changes on the load do not exceed 3.4 % under the condition of a change in the power source voltage of up to 5 %. However, this does not always satisfy consumers. The active compensation mode provides directional control of reactive power, which allows achieving greater voltage stability in the network node. The dependence of the compensator voltage on the voltage at the load node is proposed, which can be used as the basis for a STATCOM disturbance control system to reduce rapid changes in the power source voltage. The simulation results showed that in the case of active compensation using the proposed compensator voltage dependence, the load voltage practically does not change when the power source voltage changes. Thus, the implementation of the proposed dependence in STATCOM control systems significantly improves the stability of the consumer supply voltage. In real operating conditions of the electric network, the power of the synchronous compensator may be insufficient to ensure full compensation of voltage fluctuations at the consumer connection node. In this case, a partial compensation mode of voltage fluctuations using the STATCOM reactive power consumption and generation modes is proposed. In the case of an increased source voltage, the STATCOM consumes reactive power the network, and in the case of a decrease in the power source voltage, it generates reactive power, ensuring the stability of the load voltage with limited STATCOM power. The proposed models and approaches can be used to improve active reactive power compensation systems in electric networks.